
Ningyu WangTsinghua University | TH
Ningyu Wang
Doctor of Philosophy
About
26
Publications
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Introduction
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Education
August 2015 - December 2020
Publications
Publications (26)
Successful design and execution of slim-hole cementing operations depend on reliable prediction of the annular pressure and the efficiency of mud displacement by cement. A 3D model of the flow inside the casing and in the annulus during mud displacement/cement placement operations was created. The yield-power-law fluid model was used for the rheolo...
Drilling geothermal and HPHT wells is complicated by exposure of downhole tools to high temperatures. Pro-active downhole temperature management is therefore very important to prevent heat-related tool failure which can result in significant non-productive time and increased costs. Temperature management that relies heavily on surface cooling is cu...
Accurate real-time modeling of downhole temperature (DHT) in high-temperature geothermal wells is crucial for proactive temperature management and preventing thermally induced drilling issues. While existing numerical models excel at precise DHT prediction, their complexity and long computational times render them unsuitable for real-time operation...
Wells with compromised integrity can cause groundwater/soil contamination and increased carbon emissions. Given that there are more than 3.7 million abandoned wells in existence, preventative and remedial operations will need to be prioritized based on the current and future state of well integrity. Well integrity risk assessment, therefore, plays...
Downhole temperature (DHT) estimation is very important for heat management while drilling high-pressure, high-temperature (HPHT) and geothermal wells to prevent premature bit and downhole tool failure. Existing transient models neglect the impact of wellbore growth / deepening on the downhole temperature, treating the wellbore). as having fixed di...
Drilling high-temperature geothermal wells presents technical and economic challenges. Real-time and precise estimation of bottom-hole circulating temperature (BHCT) during geothermal drilling is crucial for maximizing the working life of drill bits and (temperature-limited) bottom-hole assembly (BHA) components, thereby avoiding unplanned and unne...
Four oil blobs (bright) are spinning in the EMG 700 water-based ferrofluid (dark) in a pore in a micromodel driven by a rotating magnetic field. It shows the immiscible fluid-ferrofluid two-phase flow in a pore under a rotating magnetic field. Ferrofluid is a potential flooding fluid for enhanced oil recovery and a potential tracer for reservoir ch...
High bottomhole temperature can lead to decreased downhole tool life in geothermal and high-pressure/high-temperature (HPHT) oil and gas wells. The temperature increase is exacerbated when circulation stops (e.g., during connection, tripping, and well control situations). While continuous circulation technology is an appropriate solution for managi...
High bottom hole temperature can lead to decreased downhole tool life in geothermal and high temperature / high pressure (HPHT) oil and gas wells. The temperature increase is exacerbated when circulation stops, e.g., during connection, tripping, well control situations, etc. While continuous circulation technology is an appropriate solution for man...
Heat management while drilling high-enthalpy geothermal wells is crucial for successful drilling and commercial energy extraction from hot reservoirs (150+ °C). Accurate modeling of heat transfer between drilling fluids and rock is vital to predict the transient bottom hole circulating temperature (BHCT). This allows downhole tools and drill bits t...
Mud motors are widely used in directional drilling and their failure during operation leads to costly non-productive time. There is currently no existing literature investigating the correlation between stalls detected using downhole sensors and concurrent signals produced in surface sensor data. Current motor stall detection algorithms using surfa...
As the important role of enhanced oil recovery (EOR) in meeting the world’s energy requirement is growing, use of nanoparticles in lieu of, or in combination with, the existing EOR agents to expand EOR’s applicable range is receiving significant attention. Two of the most actively investigated applications are: 1) wettability alteration by addition...
Heat management while drilling high-enthalpy geothermal (GT) wells is crucial for successful drilling and commercial energy extraction from hot reservoirs (150+ ℃). Accurate modelling of heat transfer between drilling fluids and rock is vital to predict the transient bottom hole circulating temperature (BHCT). This allows downhole tools and drill b...
Fluid droplet manipulation by external magnetic field has attracted increasing attention through years motivated by its wide applications including micro-electro-mechanical systems (MEMS), enhanced oil recovery (EOR), water decontamination, chemical reaction control, and many more. The confined deformation of a fluid droplet immersed immiscibly in...
Wax and hydrates deposition is a major concern for hydrocarbon transport in pipelines, production tubing, and other pipes in cold environments. Traditionally, chemical, mechanical, and thermal methods are used to mitigate the deposition at the expense of production interruption, complex maintenance, costs, and environmental hazards, and many of the...
Nanoparticles have great potential to mobilize trapped oil in reservoirs because of their chemical, thermal, and interfacial properties. However, the direct application of magnetic forces on superparamagnetic nanoparticles in reservoir engineering applications has not been extensively investigated. We demonstrate the enhanced oil recovery (EOR) pot...
For decades, the slide drilling system (SDS) has played a critical role in the area of directional drilling. Drilling in the sliding mode is much more time-consuming than drilling in the rotating mode for a SDS. Therefore, it generally takes more time to drill a curved wellbore segment than a straight segment of the same length. Based on this fact,...
Nanoparticles have great potential to mobilize trapped oil in reservoirs by reducing the oil-water interfacial tension, altering the rock wettability, stabilizing foams and emulsions, and heating the reservoir to decrease the oil viscosity. However, the direct application of magnetic forces on paramagnetic nanoparticles in reservoir engineering app...
Precipitation and deposition of paraffin wax and hydrates is a major concern for hydrocarbon transport in pipelines, tiebacks, and other production tubing in cold environments. Traditionally, chemical, mechanical, and thermal methods are used to mitigate the deposition at the expense of production interruption, complex maintenance, costs, and envir...
Wax, hydrates, and asphaltenes precipitate in subsea pipelines and restrict the transport of hydrocarbons. Traditional wax prevention and dewaxing methods include thermal, chemical, and mechanical approaches. This paper investigates a new electromagnetic pigging method combined with a ferromagnetic nanopaint for potentially high heating efficiency...
Ferrofluid, a stable dispersion of paramagnetic nanoparticles in water, can generate a distributed pressure difference across the phase interface in an immiscible two-phase flow under an external magnetic field. In water-wet porous media, this non-uniform pressure difference may be used to mobilize the non-wetting phase, e.g. oil, trapped in the po...
This article models the contact between the drillstring with large slenderness ratio and the extending rigid wellbore based on the multibody dynamics method. The drillstring is modeled as absolute nodal coordinate formulation beams with contact detection points. An algorithm is developed to locate the contact points and calculate the contact forces...
Ningyu Wang Z. Cheng Y. Lu- [...]
G. Ren
Drilling automation can replace manual operation with more predictable and consistent computercontrolled drilling process, as well as enhance the digital link between well-site and data center and enable the remote drilling. In this paper, the automation of drilling process is viewed as three hierarchical control loops: the trajectory control loop,...