顺北一区超深井窄间隙小尾管固井技术研究

Slim Liner Cementing Technology for Ultra-Deep Wells with a Narrow Annulus in No.1 District of Shunbei Block

邹书强 张红卫 伊尔齐木 李翔

ZOU Shuqiang ZHANG Hongwei Eerqm LI Xiang

中国石化西北油田分公司，新疆乌鲁木齐 830011

Sinopec Northwest Oilfield Company, Urumuqi, Xinjiang, 830011, China

顺北一区超深井窄间隙小尾管固井面临水泥环薄弱、注替泵压高、顶替效率低、井下温度高和高压盐水层发育等一系列技术难题，固井质量难以保证。为解决该问题，在总结前期固井施工经验的基础上，完善了井眼准备技术，优化了抗高温防气窜弹韧性水泥浆体系，开展了水泥石密封完整性研究，进行了固井流变学设计及压稳防气窜工艺优化，形成了顺北一区超深井窄间隙小尾管固井技术。该固井技术在现场应用3井次，固井质量良好，后期施工未发生水侵，保证了窄间隙段的长效密封性。顺北一区超深井窄间隙小尾管固井技术，不但解决了该区块的固井难题，还保障了该区块的安全、高效开发。

Slim liner cementing in ultra-deep wells with narrow annulus in the No.1 District of the Shunbei Block faces a series of technical challenges such as weak cement sheath, high displacement pumping pressure, low displacement efficiency, high bottomhole temperature and the development of high-pressure brine layer, which compromises the cementing quality. In order to solve those problems, on the basis of summarizing the previous operation experiences, small liner cementing technology for ultra-deep wells with narrow annulus in the No. 1 District of the Shunbei Block was formed by improving wellbore preparation technologies, optimizing the high temperature/gas channeling-proof elastic toughness cement slurry system, conducting cement stone sealing integrity research and carrying out cementing rheology design and stable-killing gas channeling-proof optimization. It has been applied in 3 wells in this area with good cementing quality. The subsequent operations were free from water intrusion, ensuring the long-term sealing of section with a narrow annulus. This cementing technology can not only effectively solve the cementing problems of this block, but also effectively ensure the safe and efficient development of the block.

国家重点基础研究发展计划（“973”计划）项目“深井复杂地层安全高效钻井基础研究”（编号：2010CB226700）、国家自然科学基金项目“控压钻井测控理论及关键问题研究”（编号：51334003）联合资助

https://doi.org/10.11911/syztjs.2019114