John Owens

Independent Petrophysical Advisor

Data acquisition in extreme environments of high pressure and/or high temperature (HPHT) with pressures up to 30,000 psi and temperatures up to 500°F requires not only specialist technology capable of surviving these conditions but also many months of preparation and planning to ensure a successful operation. The aim of this publication is to provi...

Successfully delivering HPHT well information objectives can be achieved through a robustly planned formation evaluation programme by applying the principles of a project maturation process. The following discussion outlines a pragmatic approach that compliments many existing corporate project planning systems which adopt a front end loaded philoso...

The robustness of future field development investment decisions is commonly founded upon high quality core-based data. Data acquisition in extreme HPHT environments is particularly challenging. It requires specialist techniques, months of integrated planning and preparation to ensure a safe and successful operation. Thus, securing the value chain b...

The AGORA (Advanced Geoscience Organized for Reservoir Applications) mission is to address a series of themes on a tri-annual rotating basis that have, and will continue to have, a long-term interest for the professionals in both societies. The aspiration is that the EAGE/EUROPEC AGORA would provide justice for all attempts at integration. In each...

Data acquisition in extreme environments of high pressure and/or high temperature (HPHT) with pressures up to 30,000 psi and temperatures up to 500°F requires not only specialist technology capable of surviving these conditions, but also many months of preparation and planning to ensure a successful operation. The aim of this publication is to prov...

Components in conventional downhole logging while drilling (LWD) and wireline equipment suffer from the significant challenges of time at temperatures >150 degC. This presents a technical and business challenge to the vendors and their customers. A vision of the future technology goals is described.

The assumed business decision is, “Where to drill an infill well?”. It is proposed that the key petrophysical consideration involves the evolution of subsurface realisations combined with lessons learned during the production life of the field as shared between the subsurface team. Attention is paid to three key learning points : • What did the tea...

During drilling wells in the Franklin, Elgin and Shearwater HPHT fields of the UK central North Sea, gas was often encountered over intervals in the Upper Cretaceous Hod Formation. In addition, occasionally gas has been observed, which continued to bleed into the well until the section TD. Given the common issues, the “Hod Geohazard” was identified...

Reserve evaluations, using the volumetric reserves equation, are very dependent on the accuracy of measurements used to calculate initial water saturation. Sensitivity analysis of the petrophysical parameters address this problem by using a set range of errors for each individual parameter. The benefit of sensitivity analysis is that it can rapidly...

Typical log analysis treats NaCl as the dominant salt in the formation, mud filtrate and drilling mud. However, the use of KOH-based muds changes these conventional relationships. This is indicated by some anomalies when normal methods of log analysis are used. From laboratory experiments an original method for the interpretation of spontaneous pot...

Typical log analysis treats NaCl as the dominant salt in the formation, mud filtrate and drilling mud. However, the use of KOH-based muds changes these conventional relationships. This is indicated by some anomalies when normal methods of log analysis are used. From laboratory experiments an original method for the interpretation of spontaneous p...