摘要
鄂尔多斯盆地东缘(鄂东缘)临汾区块在深层煤层气开发过程中存在埋藏深、地层层位多、岩性构成复杂、岩石胶结性差及井壁稳定性差等不利因素,该区块刘家沟组、石千峰组与石盒子组是主要的漏失层位,易发生漏失和垮塌。针对上述问题,收集整理了现场施工数据,应用Eaton法对区块进行了地层压力预测,分析了该区块地层漏失原因,对比取心数据和岩心分析结果,得出了该区块漏失机理;使用颗粒、片状及纤维等材料进行堵漏剂匹配研究,并通过堵漏模拟试验,开发出一种适用于临汾试验区块的新型复合堵漏剂;运用新型复合堵漏剂及加压堵漏施工技术进行现场试验。试验结果表明:研制的新型堵漏剂封堵宽度1~5 mm的裂缝效果显著,具有裂缝形态匹配性好、封堵范围广和封堵强度高等优点;新型加压堵漏技术施工工艺简单,劳动强度低,有效解决了静止堵漏法成功率低、操作复杂及成本高等问题。研究成果可为其他堵漏工艺或相关工程技术研究提供参考。
In the deep coalbed methane in the Linfen block of the eastern margin of the Ordos Basin,there are unfavorable factors such as deep burial,multiple formation layers,complex lithology,poor rock cementation and poor wellbore stability. The Liujiagou Formation,Shiqianfeng Formation and Shihezi Formation are the main lost circulation layers,which are prone to lost circulation and borehole collapse. To address the problems,the onsite operation data are collected,and the formation pressure is predicted by using the Eaton method. The lost circulation causes of the block are analyzed. The coring operation data and core analysis results are compared to obtain the block lost circulation mechanism. Particles,flakes and fibers lost circulation materials are studied. Through the lost circulation control simulation experiment,a new composite lost circulation material suitable for the Linfen test block is developed and field-tested combined with pressurized lost circulation control technology. The test results show that the developed new lost circulation material has significant effect on sealing the fracture with the aperture of 1 ~ 5 mm. It has the advantages of good fracture shape matching,wide fracture aperture sealing range and high plugging strength. The new lost circulation control technology effectively addresses the problems of low success rate,complicated operation and high cost of the static lost circulation control method. The study results can provide references for other lost circulation control or related engineering technologies.
作者
邓钧耀
杨松
曹振义
张毅
李世超
刘馨然
胡凯
Deng Junyao;Yang Song;Cao Zhenyi;Zhang Yi;Li Shichao;Liu Xinran;Hu Kai(Exploration and Development Research Institute of Petrochina Coalbed Methane Company Limited;CNPC Engineering Technology R&D Company Limited;Lirvfen Company of Petrochina Coalbed Methane Company Limited;China University of Petroleum {Beijing))
出处
《石油机械》
北大核心
2019年第9期37-43,共7页
China Petroleum Machinery
基金
国家科技重大专项“鄂东缘深层煤层气与煤系地层天然气整体开发示范工程”(2016ZX05065)
关键词
堵漏工艺
鄂尔多斯
深层煤层气井
漏失成因
堵漏试验
lost circulation control technology
Ordos
deep coalbed methane well
lost circulation cause
lost circulation control experiment
