Prediction of Formation Pressure Gradients of NC98 Field-Sirte Basin-Libya

作     者：Ahmed Tunnish Mohammed Nasr Mahmoud Salem 

作者机构：Petroleum Systems Engineering DepartmentFaculty of EngineeringUniversity of ReginaCanada Petroleum Engineering DepartmentFaculty of EngineeringTripoli UniversityTripoliLibya Waha Oil CompanyTripoliLibya 

出 版 物：《Journal of Management Science & Engineering Research》 (管理科学与工程研究（英文）)

年 卷 期：2018年第1卷第1期

页      面：11-17页

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

主　　题：Pore pressure Fracture pressure Overburden pressure Eaton's method Casing seating depths 

摘      要：The prediction of formation pore pressure and fracture pressure gradients is a significant step towards the drilling *** this study,the formation pressures of twelve wells from NC98 field-Sirte Basin(Waha Oil Company)were calculated by employing empirical methods,Eaton s equations,that depend on the real drilling and well-logging *** the results,the normal pore pressure in the NC98 field in Sirte basin is 9.89 kPa/m(0.437 Psi/ft),and it is extending from the top of the wells in the investigated area to 2134 m(7,000 ft).A subnormal to normal pore pressure zone is noticed in the interval of 2134 m to 2743 m(7,000 ft.-9,000 ft).Then,slightly subnormal to somewhat abnormal(overpressure)region is seen from 2743–3414(9,000 ft.-11,200 ft).Beyond to that depth and down to the top of the reservoir,the overpressure zone was clearly *** on the results,the casing seating depth and the equivalent mud weight were simply determined for the area of study.