摘要
目前中国页岩气水平井定向段及水平段钻井均使用油基钻井液,但油基岩屑处理费用昂贵,急需开发和应用一种具有环境保护特性的高性能水基钻井液体系。介绍了2种高性能水基钻井液体系的室内实验和现场试验效果。在长宁H9-4井水平段、长宁H9-3和长宁H9-5井定向至完井段试验了GOF高性能水基钻井液体系,该体系采用的是聚合物封堵抑制方案,完全采用水基润滑方式;在昭通区块YS108H4-2井水平段试验了高润强抑制性水基钻井液体系,该体系采用的是有机、无机盐复合防膨方案以及润滑剂与柴油复合润滑方式。现场应用表明,定向段机械钻速提高50%~75%,水平段机械钻速提高75%~100%。通过实验数据及现场使用情况,对比分析了2种体系的优劣,找出了他们各自存在的问题,并提出了改进的思路,为高性能水基钻井液的进一步完善提供一些经验。
A high performance water base drilling fluid is in urgent need to replace the oil base muds currently used in shale gas drilling in both the directional section and the horizontal section. This paper discusses the field application and laboratory study of two high performance water base drilling fluids. One of the high performance drilling fluids, GOF, has been used in the horizontal section of the well Changning H9-4, the directional and horizontal sections of the well Changning H9-3, and the well Changning H9-5. Another high performance drilling fluid is a highly inhibitive water base fluid of high lubricity, and has been used in the horizontal well YS 108H4 in the block Zhaotong. This fluid utilizes organic and inorganic salts as the shale inhibitors and lubricant and diesel oil to render the fluid lubricity. In filed application, the ROP of the directional section was increased by 50%-75%, and that of horizontal section increased by 75%-100%. Advantages and disadvantages of the two fluids are discussed in the paper, based on laboratory experimental data and field application information. Ideas to improve the performance of the fluids are presented for the preparation of better high performance water base drilling fluids.
出处
《钻井液与完井液》
CAS
北大核心
2016年第1期17-21,共5页
Drilling Fluid & Completion Fluid
关键词
页岩气水平井
高性能水基钻井液
井眼稳定
润滑性
流变性
抗污染
环境保护
Shale gas horizontal well
High performance water base drilling fluid
Bore hole collapse prevention
Lubrication
Rheology
Anti-contamination
Environment protection
