摘要
塔里木盆地的超深井在深井段钻井过程中井斜超标问题时有发生,影响了下部井段的安全钻进。为降低井斜超标的影响,首先从地质因素和工程因素两方面分析了超深井深部井斜的原因;结合塔里木探区超深井钻井实践,提出了井斜控制与纠斜的技术方法。对于地层比较稳定的井段,常规钟摆钻具组合配合大尺寸钻铤及合理的工艺措施,可以防止井斜;当常规防斜打直技术不适用时,用弯螺杆加MWD的导向钻具组合既能用于山前高陡构造和超深井段井斜控制,也能提高全井钻井速度;为克服螺杆钻具受耐温限制的问题,可以采用减速涡轮钻具配合PDC钻头技术实现超深小井眼防斜打快;而对于大倾角地层,目前最有效的防斜打快手段为自动垂直钻井系统,针对目前在该领域的国内外差距,建议进一步加强研发力度。本研究对同类型地区的深部井段井斜控制能提供一定的技术参考。
Hole deviation often occum during the deep interval drilling of uhra-deep wells in Tarim Basin, which undermines the safety of deeper interval drilling process. In order to reduce the influence of hole deviation, this paper analyzed the causes of hole deviation and proposed a series of hole deviation control technologies based on the analysis of geological and engineering reasons for hole deviation and drilling practices of several ultra-deep wells in Tarim Basin. For the stable formations, the pendulum assembly with large drill collar and sound technical measures can be used. When the normal deviation protection technology is not feasible, the bent screw plus MWD can be used to control well deviation and increase drilling rate. To avoid temperature restriction of positive displacement drill, the turbo drill with gear reducer and PDC can effectively realize deviation prevention in small deep hole. For the formations with large dip angle, the automatic vertical drilling system may be the most effective method. This study can provide a good reference for deviation control in deep sections with similar situations.
出处
《断块油气田》
CAS
北大核心
2011年第1期100-102,共3页
Fault-Block Oil & Gas Field
基金
国家高技术研究发展(863)计划课题"超深井钻井技术研究"(2006AA06A109)
关键词
超深井
深井
井斜
垂直钻井
涡轮钻具
uhra-deep well
deep well
hole deviation
vertical drilling
turbo drill
