彭州气田PZ115井钻井提速配套技术

Complete technology for ROP improvement for Well PZ-115 in Pengzhou Gas Field

摘要:

为解决龙门山前彭州气田钻井中上部地层气体钻井提速技术受限、易井斜，中部须家河组与小塘子组地层研磨性强、可钻性差，下部雷口坡组地层较破碎、易阻卡、易漏，以及机械钻速低、钻井周期长等难题，通过分析龙门山前彭州气田地质资料和地层特点，在PZ115井中开展了优化井身结构、水力加压器、垂直钻井技术、PDC钻头优选技术、高效钻井液技术、扭力冲击器等钻井提速配套技术的研究与运用，实现了安全快速钻井，平均机械钻速2.62 m/h，钻井周期265.75 d，与区块前期钻井周期最短井YS1井相比，钻井深度增加454 m，平均机械钻速提高24.17%，钻井周期减少了17.42 d，创川西地区雷四段气藏为目的井中钻深最深和钻井周期最短纪录。研究结果表明，PZ115井钻井提速配套技术可为彭州气田后续钻井提速增效提供借鉴。

Abstract:

There are some difficulties in drilling in Pengzhou Gas Field in Longmen Piedmont. In the upper strata, gas drilling technology is limited and prone to deviation. The middle part of the Xujiahe Formation and the Xiaotangzi Formation is featured of strong abrasiveness and poor drillability. In the lower Leikoupo Formation, the strata are relatively broken, prone to bit sticking and easy to leak. ROP is low and the drilling duration is long. Based on the analysis of geological data and formation characteristics in Pengzhou Gas Field, the research and application of complete technologies for ROP improvement, such as optimizing the well bore structure, hydraulic WOB, vertical drilling technology, PDC bit optimization technology, high-efficiency drilling fluid technology and torsion impactor, were carried out in Well PZ115. Safe and fast drilling was achieved with the average drilling speed at 2.62m/h and the drilling duration 265.75d. Compared with the shortest drilling duration of Well YS1 in the same block, the drilling depth and the ROP increased by 454m and 24.17% respectively, creating the record of the deepest drilling depth and the shortest drilling duration in the fourth member of the Leikoupo gas reservoir in the West Sichuan area. Research results show that the proposed high-speed drilling techniques for Well PZ115 can provide references for coming operations to enhance the ROP and efficiencies in Pengzhou Gas Field.