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- W4387230253 abstract "Abstract Cameroon, Rio del Rey basin has been developed in the late 70's with more than 400 wells drilled & producing from different reservoirs in vertically (stacked reservoir) and horizontally (faulted) compartmentalized fields. The long production history of these fields coupled with the under-compaction state of some deep geological formation tends to raise a real challenge to any operator which would plan to drill infill wells in this context to sustain the production rate. The addition of any drainage points in currently producing reservoirs must pass through in-depth analysis of the current state of stress in the drilled zone. One must consider the under compaction of shale layers requiring high MW to counteract the collapse pressure, the huge depletion of the targeted reservoir and the need to maintain a minimum overbalance in front of unproduced layers at virgin pore pressure. The resulting narrow margin between pore pressure & collapse pressure on the low end, and the fracture propagation and initiation pressure in the higher end, can drive to non drillability of the wells planned. However, thanks to thorough trajectory optimization - mainly well inclination angle at the entry of reservoir section - and iteration supported by a solid 1D Mechanical Earth Model (MEM), it was possible to drill two sidetracks (ESM-1ST & ESM-2ST) in this challenging environment, with up to 3000psi overbalance in front of severely depleted permeable formations, completed by a cemented 5½″ liner in 6¾″ open hole. It was possible to validate the possibility to enlarge drilling envelope by increasing the fracture pressure thanks to inclination and even being able to operate beyond this limit thanks to strong wellbore strengthening procedure implemented. Improvement process through lessons learnt from the first sidetrack helped to drill and case off the second sidetrack well successfully." @default.
- W4387230253 created "2023-10-02" @default.
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- W4387230253 date "2023-10-02" @default.
- W4387230253 modified "2023-10-16" @default.
- W4387230253 title "Drilling and Completing of Highly Depleted and Unconsolidated Sand Requiring Overbalance Mud Weight for Shale Layer. A Control Made Possible with Strong Well Planning Optimization and Mechanical Earth Model Iteration" @default.
- W4387230253 doi "https://doi.org/10.2118/216348-ms" @default.
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