High Performance Water Base Drilling Fluid CQH-M2 and Its Application on Well Wei204H11-4
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摘要: 川渝地区龙马溪组页岩的脆性高，微裂缝和微孔洞发育，钻进过程中井壁易失稳、易发生突发掉块卡钻复杂。针对龙马溪组页岩的地质特点，分析使用CQH-M2高性能水基聚合物钻井液的技术难点，提出相应的技术对策。通过实验优选出CQH-M2高性能水基钻井液的抑制剂、抗高浓度高价金属离子聚合物降滤失剂、碳醇类润滑剂和磺化沥青类封堵剂，并对其性能进行实验分析评价。实验结果表明，CQH-M2高性能水基钻井液对页岩岩屑复合电解质溶液的抑制性优于CQH-M1高性能水基钻井液、接近油基钻井液，可以有效抑制页岩水化分散；有很好的即时和长效封堵效果；滤饼质量薄而有韧性，封堵效果好；抗9%岩屑。现场应用表明：CQH-M2高性能水基钻井液满足威204H11-4井钻井技术需要，全程钻井液性能表现良好，井下安全正常。Abstract: The Longmaxi shale in Chuanyu area is brittle, and is full of micro-fractures and vugs. Challenges encountered during drilling operations are borehole instability and pipe sticking resulted from borehole sloughing. In this paper, the technical difficulties in using the high performance water base drilling fluid CQH-M2 is analyzed and measures dealing with the difficulties are presented based on the geological characteristics of the Longmaxi shale. Additives, such as shale inhibitors, filter loss reducers, lubricants and plugging agents for CQH-M2 have been optimized through laboratory experiments. Laboratory experiments on the evaluation of these additives showed that the inhibitive capacity of CQH-M2 is better than that of another high performance drilling fluid CQH-M1, almost equivalent to oil base drilling fluid in inhibiting the hydration and dispersion of shale. CQH-M2 has good instant and long lasting plugging effect. Mud cakes of CQH-M2 are thin and tough, sealing off porous formations in a satisfactory manner. CQH-M2 is also resistant to the contamination caused by 9% cuttings. In field application, CQH-M2 high performance drilling fluid has satisfied the technical requirements for drilling the well Wei204H11-4. The drilling fluid performed very well during drilling and no downhole troubles have ever been encountered.
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Key words:
- Drilling fluid /
- Water base /
- High performance /
- CQH-M2 /
- Shale gas /
- Horizontal well /
- Borehole destabilization
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