基于页岩气“水替油”的高性能水基钻井液技术

闫丽丽; 李丛俊; 张志磊; 孙金声; 徐显广; 苏义脑

doi:10.3969/j.issn.1001-5620.2015.05.001

基于页岩气“水替油”的高性能水基钻井液技术

doi: 10.3969/j.issn.1001-5620.2015.05.001

1.
中国石油集团钻井工程技术研究院, 北京
2. 中国石油勘探开发研究院博士后流动站, 北京

基金项目: 中国石油集团重大专项"浙江油田昭通示范区页岩气钻采工程技术现场试验"(2014F470205)和中国博士后科学基金面上项目(2014M550987)联合资助。

详细信息

作者简介:
闫丽丽,博士, 1984年生,现从事页岩气钻井液技术和相关处理剂研究工作。地址:北京市昌平区沙河镇西沙屯桥西中国石油创新基地A34地块;邮政编码102206;E-mail:yanlilidr@cnpc.com.cn。

中图分类号: TE254.3
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出版历程
- 收稿日期: 2015-07-23
- 刊出日期: 2015-09-30

High Performance Water Base Drilling Fluid for Shale Gas Drilling

A34 of CNPC's Innovation Base, West of Xishatun Bridge, Shahe Town, Changping District, Beijing 102206, China

摘要

摘要: 常规油气井钻井用的高性能水基钻井液无法满足页岩气长段水平井的钻井需要,而油基钻井液存在成本高和巨大的环境压力问题。以昭通页岩气示范区为目标区块,通过分析页岩气的地层特点和存在的技术难题,有针对性地研制出了一种呈黑褐色液体的高效抑制剂、一种纳微米封堵剂、一种成膜降滤失剂和一种特种液体润滑剂,并形成了一套新型高性能水基钻井液体系。该体系的流变性、降滤失性、润滑性和抑制性与油基钻井液的性能基本相当,并且具有较好的抗污染性能,具备了页岩气钻井液"水替油"所需的各种主要性能;密度为2.05 g/cm³的该钻井液中加入研制的润滑剂后,润滑系数降低26%;该钻井液具有较强的成膜封堵能力,能够封堵页岩微裂缝,阻隔压力传递;页岩岩心在该钻井液中高温浸泡10 d后仍有较高的强度,有利于页岩井壁稳定。该体系在昭通页岩气示范区黄金坝YS108H4-2井水平段的现场应用表明,该体系在钻进过程中性能稳定,流变性良好,返砂正常,润滑性良好,无掉块,电测一次成功,井径规则,平均井径扩大率为5.71%,机械钻速为11.74 m/h。该体系完全满足页岩气水平井现场施工的技术要求。
- 页岩气 /
- 高性能水基钻井液 /
- 抑制剂 /
- 封堵剂 /
- 润滑剂
Abstract: High performance drilling fluids used in conventional drilling are not able to satisfy the needs for long horizontal section shale gas drilling, and the use of oil base drilling fluids, on the other have, always means high cost and pollution to environment. A high performance shale inhibitor (dark brown liquid), a particles of nano/micro meter in diameter, a filming filter loss reducer, and a lubricant have been developed to formulate a high performance water base drilling fluid. The evaluation of this fluid has rheology, filtration control, lubricity and inhibitive capacity that are comparable to those of oil base drilling fluid, meaning that this drilling fluid is suitable for shale gas drilling. A drilling fluid of 2.05 g/cm³ has its friction coefficient reduced by 26% after treatment with the lubricant. This drilling fluid can form a thin layer of film around the surface in contact with it, thereby sealing off the micro-fractures and cutting of the channels through which pressure are transmitting. Shale cores rinsed for 10 h in this drilling fluid still retains high strength, meaning that this fluid has good inhibitive capacity. This drilling fluid has been used in the drilling of the Well YS108H4-2 in Huangjinping, Zhaotong, and the drilling operation encountered no downhole troubles and difficulties, and the wireline logging is successful. No hole enlargement was found, and the ROP was 11.74 m/h.
- Shale gas /
- High performance water base drilling fluid /
- Shale inhibitor /
- Plugging agent /
- Lubricant

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参考文献(12)

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