精细控压压力平衡法固井技术的应用实践

发布时间：2018-04-05 23:17

本文选题：超深井　切入点：尾管固井　出处：《天然气工业》2017年08期

【摘要】：精细控压钻井技术多用于解决同一裸眼油气井段存在多压力系统、窄安全密度窗口地层的安全钻进难题,其尾管固井作业若采用常规方法,在满足小间隙尾管固井顶替效率的前提下,施工过程中必然造成井漏;若采用"正注反打"工艺,固井质量又难以满足后期超深井试油工程的需要。为此,以四川盆地剑阁构造上所钻龙岗70井?114.3 mm尾管固井作业为例,探索精细控压压力平衡法固井技术在多储层、高低压互存、长裸眼段(859 m)中的固井应用。具体做法如下:①采取了确保水泥浆环空充填效率、固井施工全过程压力平衡等针对性的技术措施;②依靠精细控压钻井装置和中心管泵注加重钻井液的方式,精确控制环空压力平衡来降低钻井液密度,实现窄安全密度窗口地层的固井施工全过程井筒压力平稳。现场试验结果表明,该井?114.3 mm尾管固井质量良好,分阶段降密度期间喇叭口无窜流,试压合格。结论认为,该方法能够提高复杂超深气井尾管的固井质量,改善了后期高压气井试油安全作业的井筒条件。
[Abstract]:The fine pressure control drilling technology is used to solve the problem of safe drilling in the formation with narrow safe density window and multi-pressure system in the same open hole oil and gas well section.Under the premise of satisfying the displacement efficiency of small clearance tube-fixed wells, the well leakage will inevitably occur in the construction process, and if the "positive injection and reverse drilling" process is adopted, the cementing quality will be difficult to meet the requirements of the ultra-deep well testing engineering in the later stage.For this reason, taking Longgang 70 well (114.3 mm) in Jiange structure, Sichuan Basin as an example, this paper explores the application of fine controlled pressure balance cementing technique in multiple reservoirs, high and low pressure mutual storage, long open hole section (859 m).The specific measures are as follows: 1. The specific technical measures such as ensuring the filling efficiency of cement slurry annulus filling and pressure balance during cementing operation have been adopted. Second, depending on the fine controlled pressure drilling device and the injection of the central pipe pump to increase the drilling fluid,The drilling fluid density can be reduced by accurately controlling the annulus pressure balance, and the wellbore pressure will be stable during cementing operation with narrow safe density window.The field test results show that the well with 114.3 mm tail tube is of good quality and no channeling flow at the bell mouth during the period of gradual density reduction, and the test pressure is up to standard.It is concluded that this method can improve the cementing quality of the tailpipe in complex ultra-deep gas wells and improve the wellbore conditions for safe operation of high pressure gas wells in the later stage.
【作者单位】：中国石油西南油气田公司工程技术处;中国石油川庆钻探工程公司井下作业公司;
【分类号】：TE256

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