Drilling - Science topic

What are some of the articles from petroleum drilling techniques?

We’ve long known that geothermal could help power the world. It’s ancient, abundant, and everywhere beneath our feet. So why hasn’t it? The tech has come a long way: closed-loop systems, high-temp drilling, and better reservoir modelling are expanding what’s possible. But to 𝘁𝗿𝘂𝗹𝘆 𝘀𝗰𝗮𝗹𝗲, we need innovation that helps to de-risk projects, bring down 𝘂𝗽𝗳𝗿𝗼𝗻𝘁 𝗰𝗼𝘀𝘁𝘀, and accelerate installation and system build out. 𝗚𝗲𝗼𝘁𝗵𝗲𝗿𝗺𝗮𝗹 𝗶𝘀 𝗵𝗮𝘃𝗶𝗻𝗴 𝗮 𝗺𝗼𝗺𝗲𝗻𝘁. One driven by breakthrough tools, crossover talent from oil & gas, and serious capital eyeing firm, 24/7 clean energy. But we’re just getting started. So let’s talk about what’s changing - and what needs to happen next. 💡𝗝𝗼𝗶𝗻 𝘂𝘀 𝗳𝗼𝗿 𝗮 𝗹𝗶𝘃𝗲 discussion with leading voices as we dig into: ​•What will it really take to scale geothermal ​•Where do the biggest opportunities lie ​•Who’s needed to unlock the next wave of growth If you’re 𝗴𝗲𝗼𝘁𝗵𝗲𝗿𝗺𝗮𝗹 𝗼𝗿 𝗲𝗻𝗲𝗿𝗴𝘆 𝘀𝗽𝗲𝗰𝗶𝗮𝗹𝗶𝘀𝘁, 𝗲𝗻𝗴𝗶𝗻𝗲𝗲𝗿, 𝗼𝗿 𝗿𝗲𝘀𝗲𝗮𝗿𝗰𝗵𝗲𝗿, 𝘁𝗵𝗶𝘀 𝘀𝗲𝘀𝘀𝗶𝗼𝗻 𝗶𝘀 𝗳𝗼𝗿 𝘆𝗼𝘂 - plug into a forward-looking network driving the next frontier of geothermal. 👉 Sign up now: https://lu.ma/geothermal-renaissance?tk=x12eHT&utm_source=researchgate 🗓️ May 20, Zoom | 18:00 CET

Accidentally I deleted my important folder containing 1000+ photos. can anyone suggest me some genuine method to recover, I tried with disk drill, Recuva and R Photo (r-undelete), unfortunately none these have worked well, though i recovered the photos but I can able to open any of the file. showing it is corrupted file.

can anybody please suggest my solutions

So...has anyone else found a fluidized dacite cemented "tourmaline zebra rock" like this?

I have never heard of such a thing capping porphyry copper systems...tin, polymetallics...yes. But they are not well researched.

The descriptions of fluidized dikes exiting a high pressure center in Peru are good but the system is likely not porphyry copper related...

We drilled into the flanks of this dome on a radial dike exiting the domal bx area and found digenite in rotten pods associated with minor anhydrite at 200 meters probably when we left the lithocap. The fluidized dacite like material on the cliff is the same as what is in my hand from core drilling. The material in my hand runs 0.3-4% cu.

The whole area stands out as a distinct circular mag high so there is magnetite with the tourmaline. For fun I enclosed what looks like sheeted filled black tourmaline/hornfels? veins at 15,000 ft. (4500m) hosted in "chickenwire" foliation. Likely from granitic intrusive activity from below pushing and fracturing the central plug. No I cannot go there and do field work. I do enclose a bit of the same radial dike that provided a commercially small amount of ore grade material.

I cannot help but think some of the prominent repetitive black zones represent chemical fronts...such as found and well described in "zebra rock"...as in the one from India below.

Images from core show possible mafic enclaves and or tourmaline clots hosting chalcopyrite and covellite like blue reflecting material in a matrix hosting coxcombs and terminated quartz xtls.

Interestingly, these tourmaline rich areas seem to represent fluid escape structures from the initiation of subduction in a downgoing slab...tomographically estiated as about 100 km down. There are suggestions high B magmas in the Bonin Island Chain are modern analogues of what we see "dehydrating off" the downgoing slab and escaping the "slab wedge" area. Interesting huh?

So...those tourmaline breccias represent fluids that likely escaped from the zone of slab serpentinization.

I want to obtain well drilling data for simulating cuttings transport using ANSYS. Where can I find it?

Several indirect approaches such as harnessing drill parameters, acoustic emission parameters, thermal characteristics, mineralogical parameters, and electrical properties of rocks have been extensively explored to predict rock properties.

During drilling, the Target zone is 50,000ft, but at the present depth of 27,000ft, traces of oil are found in the mud pit. What do we do? Stopping drilling is not an option.

Is it better to drill groundwater wells in or near valleys?

Could you recommend some Articles on the Intelligent Construction of Coal Mines?

Hello,

Can somebody please give me some reference to a paper or book where it is explained how to condensate:

* from a Q8 serendipity FE to a Q4 FE with drilling DOFs (16 DOFs to 12 DOFs).

* from a H20 serendipity FE to a H8 FE with drilling DOFs (40 DOFs to 24 DOFs).

See the attached figures, taken from the RFEM technical manual.

Regards,

Diego Andrés

I want to use it as a reference because the shapes and designs of various PDC drill bits and roller cone drill bits are difficult. I would appreciate it if I could get help designing the inserts and cutters right. Thanks!

Can anyone recommend Machine learning textbook or any material for analysis/data modeling?

Brief; I have rock drilling experimental data. I would like to use machine learning techniques for modeling of drilling energy. Request any materials/journals, textbooks related modeling please share with me.

With regards

Dr.Vijaya Kumar Chodavarapu.

Iraq has no barite, but celestite can be found on some sites, need to use this celestite as a partial or total substitute for barite in thinking the drilling mud in the oil industry in Iraq

Drill Pipe Failure Analysis

1. Following the (fast approaching) energy crisis, what is the rate of increase in the number of deep wells (say, a well drilled, at least below 15,000 ft for the purpose of exploring for and producing of oil and/or gas); and what is the respective yearly average depth of these wells (before and after Paris Agreement, 12Dec2015) in the context of statistical trends in the drilling of oil and gas wells?

2. Do we still have a relatively good shallow prospects to be drilled?

3. As on date, what would be the percentage of the total budget used in planning for the drilling of a deep well to that for the building of a plant?

4. What is the common budget for the ultra-deep wells, as on date?

5. How exactly is a good workable drilling plan developed?

6. Is there an easy way to figure out, the way the drill pipe gets attacked by corrosion and erosion resulting from the complex alternating loads acting on the drill pipe, including tension, compression, torsion, bending and vibration (in the context of investigating the failure of drill pipe, associated with oil and gas fields)?

7. Can failure of a drill pipe occur at any instances, apart from, @ joint threads; internal surface defects; corrosion pits; and thickened transition areas?

8. Are the failures of drill pipe, remain only associated with, perforation, cracking and fracture?

9. Whether, the predominant failures of drill pipes, remain associated with fatigue or fatigue-induced mechanical defects?

10. Can we expect plastic deformation in the absence of over-load, associated with the ductile fracture of drill pipe?

11. If the location and time of drill pipe failures remain random and if such drill pipe failures have multiple causes and origins, then, how precisely, will be able to assess the failure patterns involving stress concentration, strength reduction, crack initiation, crack propagation through wall thickness, drill pipe perforation and fracture?

Particularly, how about the assessment of ‘crack initiation mechanism’ (friction heat, mechanical damage & corrosion pits) and crack expansion mechanisms (fatigue cracking, corrosion cracking & sulfide stress corrosion)?

12. Is there any other sensitive/critical factor towards failure analysis of drill pipe, apart from material performance, failure characteristics, corrosion characteristics and stress analysis?

Geotechnical engineers often rely on specialized equipment, such as borehole drilling rigs, to complete their work.

it can be helpful to mention the specific piece of equipment that we find most useful in our job.

Hello guys

I've modeled a composite specimen consists of eight layers & I wanna analysis that during a drilling process by getting results from history output. Buy the problem is that my history output plots for reference point of drill bit are zero & doesn't have amount during the process. I would really appreciate if someone knows the problem.

Thank you all

Is it possible to generate drill files in CST for PCB fabrication? I know I can make gerber files there, but can't find any way to make drill file

While drilling detection can also be developed in those directions. What are the ideas for the development of deep space while drilling ?o be developed in those directions. What are the ideas for the development of deep space while drilling ?

Dear all,

we are currently trying to map Drilling-tunnels in the Tibia. We are using Horos and we are marking the Drilling-Tunnels on each slide using the Oval tool. In order to secondarily recalculate the volume and shape of the Drilling Tunnel, we would need to extract the centroid and orientation of each oval.

Does anyone know how we can retrieve this information from Horos or do you have any recommendation for another DICOM program (freeware) that could do the job?

Thanks for your help!

Cheers,

Sebastian

Formation Evaluation: Fractured Reservoir

1. During exploration phase, how precisely would we be able to define the prospective structure of a fractured reservoir field by using seismic records, gravity and magnetics?

How exactly to distinguish between low-permeable rock-matrix and a high-permeable fracture?

Feasible to delineate the fracture-matrix interface?

2. To what extent, the data associated with mud logging, logging while drilling (LWD); and measurements while drilling (MWD) – would get disturbed – upon drilling a wellbore through such a prospective structure (fractured reservoir)?

How easy would it remain to secure the cuttings of cores or sidewall samples from those wellbore – in the absence of losing the original reservoir property?

3. What exactly is the difference between well reaching the prescribed depth

(a) where, well meets low-permeable rock-matrix?

(b) where, well meets the high permeable fracture?

OR

(c) Geosteering would be able to steer the wellbore path to intersect the formation of interest at the desired position of the reservoir?

Will there be any difference between the above two cases upon running the conventional wireline logs (refining seismic interpretation/VSP)?

How about the initial analysis of mud-log and initial log analysis in such cases during drilling phase?

Would it precisely direct towards the required wireline formation testing or DST during testing phase?

Even, if the above analysis prove the formation to remain to be productive, how useful will be the following core analysis from such fractured reservoirs?

4. Is there any distinct identify associated with the mu-logging process of wildcat wells; and while, drilling and logging (with wireline logging tools) of development wells – in a fractured reservoir?

5. Albeit, DST would be able to provide the proof that hydrocarbons exist in a fractured reservoir, would it be able to supply the data on both the capacity of the reservoir and its ability to produce in the long run?

Feasible to have a correct interpretation of pressure records from DSTs?

DSTs along with wireline formation testers will be able to provide a detailed formation pressure data in a fractured reservoir?

Compared to the old-fashioned and currently used emulsion type explosives, the explosive filling of the tunnel face with bulk charging provides better and higher quality vibration values. if you are drilling in the tunnel face with the Mwd (measurement while drilling) featured jumbo. Because with the mwd-capable machine, heterogeneous drilling is performed in the formation whose face surface is uneven and the drilling lengths are different. Therefore, a homogeneous charge in a heterogeneous face with an emulsion-type explosive of constant kilogram will be difficult. Therefore, I think that more stable vibration data will be obtained with bulk charging. What is your opinion?

Feasible to define reservoir fluid flow under steady-state conditions?

If a well is drilled in a petroleum reservoir – that penetrates the entire thickness of the reservoir (pay-zone thickness), then, whether the influence of the oil production would extend radially outwards from the production well with time?

And, under such circumstances, whether the oil is produced 'entirely' from the 'elastic storage' within the reservoir? If so, then, since the produced oil must come from a reduction of storage within the reservoir, could steady-state flow ever exist (of course, transient flow can exist)?

On the other hand, if the change in ‘drawdown’ (piezometric surface after commencing production) remains significantly small (negligible) with time, then, the oil flow towards the production well can be considered to be under steady-state conditions. But, in such cases, would it remain feasible to ensure that the drawdown remains insignificant in a real field scenario?

During a field test, how do we ensure that the piezometric surface remains horizontal (or nearly so) over the drainage area of interest that will be influenced by the field test? If the well (that has been drilled) does not penetrate the entire thickness of the reservoir, then, obviously, oil flow may not remain horizontal. In such cases, won’t the streamlines become 'curvilinear' in the vicinity of production well?

If so, what would be the normal threshold length – from the production well, over which, this curvilinear profile would become a linear horizontal profile (so that Darcy’s law could be applied comfortably)?

When the oil removed from reservoir storage remains discharged @ a constant rate, then, can we also ensure that the stored oil from the reservoir gets released ‘instantaneously’; while, it also remains directly proportional to the rate of decline of pressure head (in a transient fluid flow condition)?

In a real field scenario, won’t there be a ‘time lag’ between the pressure decline and the release of the stored oil?

And also, generally, how long will a well take – for the well discharge to remain as a constant (following the pump getting adjusted itself to the changing head)?

Or,

Can it be ignored as the production time is very large?

Can we ensure both (a) drawdown differences with time remaining significant; and (b) hydraulic gradient varying with time – for a transient oil production – in a real field scenario?

How do we ensure in a real field scenario that the late-time production data remains not getting influenced by any input from adjacent reservoir compartment (leakage)?

I want to measure the tolerance of the hole drilled Through EDM, for that I am in search of CMM and VMM. Kindly suggest the lab where these machines are available.

Hello everyone, hope you're doing well. I'm trying to setup a FSI simulation with a rotating domain, in this case i'm trying to approach the problem of drilling in Oil&Gas industry, where there's an anullar flow going throw the hole and an inner drill rotating, however I've been having troubles with the convergence of the simulation, i've tried with different options like deforming geometry - Rotating domain and also with the deforming mesh - Rotating domain in Comsol but It doesn't seems to work for me, any suggestions?

more papers about this topic???

limitations??

data

Hello! I have the opportunity and interest to explore the possibility of using drill cuttings as a fertilizer or building material. I would appreciate any help/sources.

In laser drilling of silicon, I would like measure the HAZ around the drilled hole in simulation. It is easy to find out in the experiment as I can measure dark colored region. For metals, it is easy to find out HAZ as they have a range for recrystallization temperature. But I am not sure for semiconductor and ceramic materials.

Please share if you have any experience.

Minimum Quantity Lubrication (MQL) is a theoretically and practically proven technic. When MQL is adopted in a production sector, for example (any machine tool-Lathe, Milling, Grinding, drilling), what are the challenges faced (Pros and Cons)?

I intend to write articles using experimental drilling data (inputs and outputs) for which I will need an appropriate analysis and prediction method.

what is the chance of publishing an isi paper in this area ???

Example, is there some liquid we can gargle to remove cavity?Something that efects cavity but not enamel or gums?

Hello,

I would like to know if anyone has a better idea to control the polishing depth of drilled hole diameter. Because, the hole disappears when I polish more. It is really difficult to find the cross section of the laser drilled hole exactly at its half. The diameter of the hole is around 100um. Please suggest some idea on this.

I want to know if someone has made a research in which has drill and obtain cores from the top of the Zugspitze mountain (2,962 m.a.s.l.) in Germany and obtain the diversity of microorganism there. I have been searching but, there is only something related with aire microorganism at that altitud and something in the ice 300 m below the highest part.

We tried different diamond drill bit but it takes long time to drill a hole of 5mm and depth of 16 mm.

I am a Final year student doing research on Low-cost Combine seed drill machine. Kindly suggest me Research articles which I should read and get in depth knowledge.

there are two PDE equations, and boundary&initial condition are known, q is a random noise O(E-3), q0' = 0. y0 = y0' = 0. I want to know what numerical method I can use to solve this PDE.

Hi all,

I have been studying up on the properties of Calcium Chloride and its application on a range of industries (De-Icing, O&G, Food, Healthcare etc...)

From what I have read , CaCl2 is used as an additive in drilling mud (increases density of fluid, prevents shell & clay hydration, several advantages...).

However, I have also read it provides a cooling effect to the drill bit? From what I understand, CaCl2 undergoes an exothermic reaction with water. So given the mud is aqueous-based, would this not be counter intuitive?

Thank you for your response!

A question description.

A POAC-2011 paper by Sudom et al., ("Analysis of first-year and old ice ridge characteristics"), 347 studied ridges are reported (areas from the Baltic Sea to Okhotsk Sea and Labrador Sea etc.).

I mean the "studied ridges" the ridges that are drilled thru with wriring the voids, keel depth etc.

Is there any new numbers for the studied ice ridges (with subduvision on areas of studies)? Need a recent numbers for comparison of what we have.

Regards in advance.

best regards,

Igor Buzin

In my recent studies, I found references, where the equations presented were incorrect. Especially in a case like Eaton's pore pressure estimation equation, these mistakes were widespread.

Dear All, I am working on drilling simulation using Ansys. But I am not able to provide angular velocity and feed using software. In initial conditions I provided angular velocity but my tool is not rotating. Please help me.

With the reference to some research articles

i want to look at country of origin by states to have communication lines with groups with specific language skills. analytics practice

The earth pressure at the tunneling face is not equal to the earth pressure at the bulkhead of shield machine. We generally adjust the bulkhead pressure by changing the speed of the screw conveyor during drilling. What is the control standard of bulkhead pressure?

CRUDE OIL MARKETING

1. Whether the recent past technologies in petroleum exploration and production - such as 4-D seismic imaging, basin modeling, remote sensing integration and slim-hole drilling – have really reduced the costs of exploration and production - while enhancing the reservoir efficiency - with reduced environmental impact?

2. Whether the cost enhancement – associated with the cost of exploration and production - by major oil companies results from

(a) high price of advanced technology; OR

(b) due to the requirement on drilling of more number of confirmation wells – near the discovery well (in addition to drilling a test well) – in order to confirm the amount of oil present; OR

(c) due to the shortage of skilled human resources; OR

(d) due to the enhanced number of (offshore) wells drilled; OR

(e) due to the expansion of the oil exploration and production activities in harsh environments?

3. With reference to the recent oil and gas production associated with harsh environments, whether the ‘long-run average total cost’ (LATC) – would – as usual - decline with increasing production?

Can we expect the ‘variable-costs’ (operating costs) to remain much lower than the ‘fixed costs’ (the costs of exploration and development) – in such harsh environments too?

4. Whether the demand for crude oil is ‘still’ a derived demand (that depends on refined oil products demand)?

5. Whether ‘world oil industry’ requires a drastic change in ‘oil marketing’ – leaving aside the conventional approach of either ‘wholesale markets’ (large sales are made to sellers of small volumes) or ‘retail markets’ (that sell to final consumers) – operating - either through - single-sale basis or by short- or long-term contracts?

6. Albeit the dependence of ‘oil product pricing’ on ‘crude oil price’ and the quality of crude in terms of sulfur content and density, whether high quality of crude always yield high-value products?

OR

Oil product pricing has become a complex function of

(a) the degree of market competition;

(b) the way oil products are being traded in financial markets; and

(c) the local government’s regulations?

7. Whether high oil prices still stimulate more investment in oil exploration?

8. Whether ‘crude oil marketing’ is slowly becoming more like ‘product marketing’?

Please, I am searching for master Thesis topic in Drill engineering : Geomechanic ,, Analyzing and improving technique and/ or technology of HDD for special tasks, and similar research field like Clay for Drilling Fluid.. I will be very glad if somebody could give a link or Idea on any of the above mentioned areas.

Just an explanation

I am a research scholar working on evaluation of delamination for holes drilled in CFRP composites.

I want to measure the delamination of hole drilled in CFRP material. My drill diameter are 4, 6 and 8 mm. Can anybody suggest an alternative to capture the image of drilled surface in CFRP composite, as I am not able to capture the image using optical microscope. The least magnification I have tried is 4X magnification, in this also I am not able to capture the image.

Cam anyone suggest a standard equipment to capture the images of drilled surface for the respective diameter hole.

I have to measure the delamination factor for 540 holes drilled.

Other alternatives I have tried is C-Scan but it consumes lot of time. Any valuable suggestions will be very much appreciable.

In the oil and gas industry, for technical, economic, and similar reasons, well-Log running is done from special intervals. Therefore, to build comprehensive models for field development, we will need more information at different depths. Today, with advances in numerical methods, especially machine learning and deep learning methods, we can use their help to eliminate these data gaps. Of course, there are methods such as rock physics that are very practical. But according to my results, part of which is described below. It is better to combine the rock physics method with the deep learning methods, in which case the results will be amazing. I selected wells from the Poseidon Basin in Australia for testing and got good results. In this study, by combining the rock physics method and deep learning (CNN + GRU), the values ​​of density, porosity, and shear wave slowness were predicted. A comprehensive database of PEF, RHOB, LLD, GR, CGR, NPHI, DTC, DTS, and water saturation logs was prepared and used as training data for the wells. The below figure is the result of a blind well test for Torosa well in the Poseidon Basin, Australia. As you can see, the prediction results are very close to the measured values ​​of shear wave slowness in this well.

I am currently focusing on 3D geomechanical modeling. And in the future, I want to extend it to a 4D model. During my recent studies, I realized that most of the 4D geomechanical modeling that has been done has not properly updated the elastic properties such as Young's modulus, bulk modulus, Poisson ratio, etc. If a 3D static model is extended to a dynamic model, or a two-way or one-way coupling is performed, it is necessary to consider all material behaviors in a time-dependent manner. Please share if you have useful information in this regard or if you have a suggestion, I would be grateful if you could comment.

I'm looking for an answer to question:

Is there a universal method for converting and determining wood density from drilling results using a resistograph?

Tool: IML PD400

I need to measure the tip point of the drill bit using a non-contact pyrometer device. However, the thickness of the undrilled part and cutting fluid affect the measuring device for getting the exact temperature of the drill bit. So, is there any method for measuring the internal temperature of a solid body?

What is the relationship between circularity, cylindricity and roughness of drilled holes and how to control the roughness of holes?

Dear All, I am doing drilling simulation using explicit dynamics in ansys but not able to create the frictional contact between two bodies. Please find the attached file in which I am not able to select contact. Please help me. Thanks in advance.

Hello: i am thinking of getting a motorized stereotax system, i.e., a drill/injection robot. There are two systems in which I am interested but am not sure which one to get. Anybody with experience with these products:

a) Kopf Model 900HD, with Kopf Neuro21 Drill & Nanoinjection Robot

b) Kopf dual standard frame with NeuroStar Drill and injection robot

Thanks for your help.

Olli.

while drill in some reservoir observed detected helium and Co2 , could we figure out the environment from this geochmical fingerprint. or we can understand the paleo- climate in these reservoir.

Facing a problem while simulating the laser drilling in COMSOL Multiphysics. I'm not able to coupled the fluid Multiphysics and phase change Multiphysics with the heat transfer in solid.

Also error is coming while using the moving mesh method.

Please help me out, Thank you in advance.

How can we decide the value of prescribed mesh velocity in moving mesh method while simulating the laser drilling in comsol.

Thank you in advanced

Dear All, I am trying to generate chip in Ansys workbench but chips are not coming out. Kindly help me to generate chip. Only red dots appeared near the cutting area.

Thanks in advance

RMR system is uesd for deepwater surface drilling for many years, and it works well. But when I read the related literature, I was confused. Can the RMR system install a blowout preventer on the suction module on the seabed? If the blowout preventer is installed, does it change from a dual gradient to a single gradient?

I am working on a capstone project for my mechanical engineering degree. Our design is an attachment for dental drills that will detect the drilling depth as the procedure is happening and will notify the dentist when the correct drilling depth is achieved. In order for the design to detect the drilling depth (up and down linear movement) there must be a sensor that can measure how deep the drill has moved down into the tooth. This sensor will be wired to a wifi enabled microcontroller which will send the data to an iot platform that is integrated with matlab to process the incoming data. We need to provide a proof of concept as ar real prototype is out of the question due to covid.

TL/DR: Is there a sensor small enough that can be attached to a dental drill that can measure linear position (up and down)?

Dear All, I am working on drilling simulation using Ansys. But I am not able to provide angular velocity and feed using software. In initial conditions I provided angular velocity but my tool is not rotating. Please help me.

I have a piece of lead (2mm x 2mm x 2mm cube). What is the best method to make a hole (200 micron diameter) in it? I guess it is too soft to simply drill it, since I care about the smoothness of the walls. Can you recommend another way of doing it?

Post processing is done successfully, meshing is done successfully but when I get to the running of solutions it gives error after sometime

How I can proceed for finite element modelling of micro drilling on Additive manufacturing part. Please provide your valuable suggestions.

Is it possible to do the same on COMSOL?

Can someone help with the empirical relations for yield point, initial and final gel strength of drilling mud?

How to simulate multicomponent and multiphase mixture such as drilling mud

Let's say 26 gm Bentonite + 500 ml water+ 2g Carboxymethyl cellulose+NaOH

We have a residue management project running here in our station, inside this project we want to measure draft power variation due to different factors. In this case, we need to measure the power used during using the machines. I am expecting from experts around the globe working in related fields to share with me devises available to measure such a moving loads. I have heard something about moving load cells but am not clear about this as well.

Thank you!!

Do you know any technology or a company that provides safe / tight drilling through drinking water aquifers in order to install GHE for shallow geothermal?

Only proven technologies are of our interest!

Initiated actions - Train traffic, Drilling, Tunneling, Excavations, Construction (underground), Extraction of minerals, etc.

Note: The answer may also consider upper or on the ground initiated actions as well.

I already published some works on predation by drills on ostracods, however I wonder if there are recent publications on the subject!

Does anybody have knowledge of the recent statistics about the utilization of drill and blast method and mechanical excavation? I need statistics about the subject and I am sure I saw it somewhere but I was not able to find it again. I recognize that the question is broad but references from different methods of mining or tunnelling are welcomed.

Thanks in advance!

Hi everyone,

I'm currently studying an MSc in drilling and well engineering, however, I'm struggling to come up with my project proposal for my final thesis.

I really like the use and application of MPD technology, and I was wondering if anyone had any ideas/topics for what I could research?

Thanks in advance,

Sonny.

Brief Description of the Invention The principal object of the hydraulic tie rod for construction projects of the present invention as well as of the method for constructing building structures utilizing the hydraulic tie rod of the present invention is to minimize the aforesaid problems associated with the safety of construction structures in the event of natural phenomena such as earthquakes, hurricanes and very high lateral winds. According to the present invention, this can be achieved by a continuous pre-stressing (pulling) of both the building structure towards the ground and of the ground towards the structure, making these two parts one body like a sandwich. Said pre-stressing is applied by means of the mechanism of the hydraulic tie rod for construction projects. Said mechanism comprises a steel cable crossing freely in the centre the structure’s vertical support elements and also the length of a drilling beneath them. Said steel cable’s lower end is tied to an anchor-type mechanism that is embedded into the walls of the drilling to prevent it from being uplifted. Said steel cable’s top end is tied to a hydraulic pulling mechanism, exerting a continuous uplifting force.

The pulling force applied to the steel cable by means of the hydraulic mechanism and the reaction to such pulling from the fixed anchor at the other end of it generate the desired compression in the construction project.

The Patent Idea

We have placed on a table two columns, one column screwed on the table, and the other simply put on the table. If one shifts on the table, the unbolted column will be overthrown. The bolted column withstands the lateral loading. We do exactly the same in every column of a building to withstand more lateral earthquake loading. That is done, by simply screwing it to the ground. This pretension between the roof of the structure and the soil has been globally disclosed for the first time.

The invention stops the bending of the bearing vertical concrete elements by imposing compressive stresses on the cross sections. as well as the tipping moment, through the anchoring mechanism which anchors strongly under the foundation ground. It also creates an improvement in the bearing capacity of the soil in both compression and traction. Prefabricated structures made of reinforced concrete are the ideal constructions in which the invention has high efficiency and utility for the following reasons.

1) Prefabricated reinforced concrete structures are rigid and the imposition of compressive stresses on the cross section makes them even more rigid and improves the shear of the base. 2) The mathematical formula to find the moment of inversion is (force X height and the product is divided by the width of the wall) If we have a prefabricated two-storey reinforced concrete structure 7 meters high and with a frame width of 4x4 meters, which accepts a lateral force of 80 tons, the tipping moment will be (7X80 / 4 =) 140 tons If we place 2 tendons on each side of the prefabricated house, then each one must create a moment of stability> 70 tons.

If the same construction was based on 4 columns of dimensions 0.40X0.40X 7.00 meters then the moment of stability of the tendons would be much greater. (7Χ80 =) 560 tons 560/2 = 280 tons. So there is a big difference in dynamics, between the choice of columns and walls, and the stress of the tendons to the tensile stresses, and the anchors to the ground adhesion and the cross sections to the compression. So the choice of prefabricated is better.

3) Prefabricated houses are also industrialized and cost half the money that another construction costs.

These three main reasons are where they make the patent on prefabricated houses profitable. Both cheap and anti-seismic.

I'm not an expert in existing technology, but I'm very much an expert in the technology I suggest.

Please correct me if I am wrong in the following that I will say ....

Elasticity stores seismic energy and returns it to each seismic load cycle.

No failures are observed in this area of ​​elastic displacement However, seismic damping is created in the elastic displacement region by the friction of the materials which produce heat.

That is, they convert kinetic energy into thermal energy.

Prefabricated houses are completely rigid with almost zero period, and have zero seismic damping.

This is not good for prefabricated houses because seismic damping only does good.

When the ground acceleration is large the elastic construction creates large curves in the trunk of the beam and the pillar, and the elasticity begins to be lost and many small cracks are created at the ends of the beams.

These small cracks are the so-called plastic failure areas or so-called plasticity.

The mechanism of plasticity releases seismic energy, and this is good for construction.

This excess displacement outside the elastic region is the inelastic displacement region in which the plasticity mechanism occurs, but the structure does not return to its original position as it returns to the elastic displacement region.

If the earthquake is too big and the displacements will be too big and the curves in the trunk of the beam and the pillar will be too big and will create big cracks above the breaking point, and if there are many the construction will collapse.

Here's the weak point of the existing design.

In large earthquakes the existing design fails to control the inelastic displacement and the structures collapse.

If you increase the cross sections of the elements, the elasticity is lost, the seismic intensities increase as the mass increases, and the walls drop high torques at the base, due to the lack of elasticity.

Plasticity is also lost.

These stiffening factors create a large tipping moment in prefabricated houses, which creates a recoil in the total base area of ​​the house.

The building loses ground support.

As a result, a large torque, in the opposite direction of the overturning torque is created, which is responsible for the failures of prefabricated houses.

What the mechanism of the invention does is to create a moment of stability to balance the overturning moment, so that the construction does not lose ground support.

In high-rise prefabricated houses the problem grows.

With the patent we will build prefabricated skyscrapers, with lower cost and greater seismic response.

This stability force, the mechanism takes it from the ground, so it has no mass to increase the inertia intensities.

On the other hand, the mechanism deflects all the forces of the earthquake into the ground, preventing them from being directed to the cross sections of the beams.

Still The pre-tensioning in the cross-sections of the prefabricated houses increases their dynamics by eliminating the cutting of the base, and the shear failures.

Loose soils can be sandy or clay and there is definitely water in them.

In a medium-sized earthquake, these soils recede and the structures either tilt or collapse.

The mechanism of the invention is a tool which not only pre-compacts loose soils by exerting hydraulic pressures on the horizontal and vertical axis, (before construction) to increase their bearing capacity,

but strongly tightens the construction to the ground by assuming static loads and traction loads of the base.

Successfully dealing with both seismic waves (P) and catastrophic waves (S) without losing traction with the ground.

Hello Everybody!

I have been doing simulation of CFRP/AL stack. In my simulation I wanted to extract the thrust force at reference point that I defined on the tip of drill bit(modeled as discrete rigid) but every time I create X Y data it shows zero value. Even though the drill is penetrating in the material and I get elements deletion but this reaction force in Z direction is Zero. I am attaching the picture of the plot and the ODB data that I request for output along with some pictures of penetrated drill bit. I am using VUMAT in which Hashin criteria is for Fibers and Puck's Criteria is for Matrix. Moreover for Aluminum I am using built in JC model.

Another problem is that even though I defined the time step to be 0.5 sec the model kept iteration on 0.25 and don't go any further.

I am hoping to get the solution. Thanking you in anticipation

Usually in small projects great importance is given to statics and very little importance to the foundation ground. The soil by its natural composition is inhomogeneous and its quality is given to change from one foundation to another. It can also hide other dangers such as caves under the bases and underground rivers that can carry the ground. For the above risks, drilling must be done before designing the bases to consider the soil composition which determines both the size and type of bases, in relation to the planned loads to be undertaken. However, only in very serious projects is soil sampling done due to cost. Drilling is necessary to place the patent mechanism under the foundations, so sampling the quality of the foundation soil is given by the design method I propose. Civil engineers to ensure a strong foundation in the construction remove the soft soil of the surface with the excavations to find more compacted foundation soil. The deeper into the ground the foundation is, the more compact and suitable the soil is, because the very weight of the upper layers has compacted the lower layers. Excavations are a big cost in construction but absolutely necessary. The method of the invention provides a stronger foundation ground because the mechanism is placed at great depths to which it carries static loads. and secondly it condenses them mechanically, more than they have condensed with their own weight, both in the horizontal direction and in the vertical direction. On the other hand, it ensures larger load-bearing surfaces because apart from the ground surface under the foot of the base, which bears the weight of the construction, there is also the adhesion of the mechanism to the drilling depths, which also receives large static loads. This extra foundation offered by the mechanism of the invention is absolutely necessary in an earthquake. During the earthquake the ground recedes, because with the vibration it condenses more, and the result of the compaction is to create subsidence. For this reason, water rises to the surface of the soil during the earthquake, because the compaction of the soil displaces to the surface the light water that was in the soil. This phenomenon becomes more intense near sea areas with loose soils from landfills So the pre-compaction of the soil which the mechanism of the invention applies to its horizontal and vertical cross-section, is very positive, because it prevents the subsidence of the ground in seismic displacements. Soil subsidence, when homogeneous, sinks the structure into the ground, while when the subsidence is inhomogeneous the construction either tilts or deforms the cross sections around the nodes of the construction. Here we see that the benefit of the invention is twofold, because it protects the construction on the one hand from deformations and on the other hand from subsidence. To achieve the double good we must also apply double pretensions. In order to achieve first of all the improvement of the foundation soil + compressive loads in the cross section of the wall, we practice two separate pretensions with the same tendon of the mechanism.

The first large prestressing is applied (before the start of construction) between the surface of the foundation ground and the anchoring mechanism that we have placed at the depths of a borehole. The tension is applied by a tendon with the help of hydraulic tractors, to expand the mechanism to the slopes of the drill, and by pressing them, condensation and adhesion are created, due to friction. The traction of hydraulic tractors must be in the order of twice that of the design calculation. After the traction is completed from the surface of the foundation ground, in order to remove the jacks and maintain the traction intensity, we secure the tendons with nuts. Then for greater adhesion we fill the drilling hole with concrete. With this method we completed the optimal improvement of the foundation soil + the anchoring of the anchorage. Then, using joint nuts, we extend the protruding tendon from the ground to the roof, gradually, and on the roof, with hydraulic jacks, we apply the second lower tension prestressing in order to impose compression on the cross sections of the construction. The compressive force on the cross-sections is imposed, in order to strengthen the cross-section towards the shear failure, and the anchoring of the structure to the ground is intended to deflect seismic stresses into the ground by preventing them from being driven over the cross-sections around the nodes.