准噶尔盆地P区块火成岩油藏高效钻井技术

Efficient drilling technologies for the igneous reservoir in Block P of the Junggar Basin

张俊成 蒋贵智 国林帅 王富伟 王露 王家强 李江

ZHANG Juncheng JIANG Guizhi GUO Linshuai WANG Fuwei WANG Lu WANG Jiaqiang LI Jiang

长江大学石油工程学院 新疆贝肯能源工程股份有限公司 中石化新疆新春石油开发有限责任公司

College of Petroleum Engineering, Yangtze University, Wuhan 430100, Hubei, China Xinjiang Beiken Energy Engineering Co., Ltd., Karamay 834000, Xinjiang, China SINOPEC Xinjiang Xinchun Petroleum Development Co., Ltd., Tacheng 834700, Xinjiang, China

准噶尔盆地P区块为火成岩油藏，钻井过程中存在机械钻速低、井壁稳定性差、井斜控制困难等诸多技术难题，严重制约了钻井速度。在分析钻井技术难点的基础上，通过井身结构优化、高效破岩钻头优选、水平段稳斜钻具设计、钻井液体系优化、固完井技术优化、“漏、溢”针对性处理等一系列钻井技术措施，并根据区块特点，提出“漏而不堵，溢而不压”的钻井新理念，达到了提速提效的效果。现场应用表明，平均钻井周期降至13.3 d，石炭系平均机械钻速达到12~16 m/h，实现了在火成岩油藏高效钻井。研究结果可为火成岩地层高效钻井提供借鉴。

Block P in the Junggar Basin is an igneous reservoir and its drilling process faces many technical difficulties, such as low rate of penetration (ROP), poor well stability and difficult well deviation control, which restrict the drilling speed seriously. In this paper, the drilling technological difficulties were analyzed and then a series of drilling technologies were researched, including casing program optimization, efficient rock breaking bit selection, design of angle holding BHA in horizontal section, drilling fluid system optimization, cementing and completion technology optimization, and specific “leakage and overflow” treatment. In addition, a new drilling concept of “no plugging to leakage and no kicking to overflow” was put forward according to the characteristics of this block. Thus, the ROP and efficiency are improved. The field application shows that the average drilling cycle drops to 13.3 d, and average ROP in the Carboniferous reaches 12-16 m/h, so as to realize the efficient drilling in igneous reservoirs. The research results can provide theoretical guidance for the efficient drilling in igneous strata.

10.13639/j.odpt.2021.05.005