川滇页岩气水平井水基钻井液技术

发布时间：2018-10-17 08:37

【摘要】：为解决水基钻井液钻页岩气水平井过程中出现坍塌等井壁失稳问题,以多碳醇、磺化沥青钾盐为核心处理剂,研究了一套针对川滇页岩气地层的新型水基钻井液。通过膨胀率、回收率、力学特性分析、封堵、抗污染等实验,研究了新型水基钻井液基本性能。结果表明,新型水基钻井液显著抑制云南龙马溪组、四川龙马溪组及五峰组页岩水化膨胀与分散,页岩膨胀率分别为1.23%、0.95%和0.98%,回收率分别为98.94%、99.13%和99.05%,其抑制页岩水化膨胀分散性能与油基钻井液相近;与常规水基钻井液相比,页岩抗压强度降低程度大幅减小,能有效减缓页岩抗压强度降低,对页岩裂缝具有较强的封堵性;抗盐(5%Na Cl)、膨润土(5%)、岩屑(20%钻屑)污染能力强,具有良好的稳定井壁效果。
[Abstract]:In order to solve the problem of sidewall instability such as collapse in drilling shale gas horizontal well with water-based drilling fluid, a set of new water-based drilling fluid for gas formation of Sichuan and Yunnan shale was studied with polycarbonic alcohol and sulfonated bitumen potassium salt as the core treatment agent. The basic properties of the new water-based drilling fluid were studied by experiments such as expansion rate, recovery rate, mechanical property analysis, plugging, anti-pollution and so on. The results show that the new water-based drilling fluid significantly inhibits shale hydration expansion and dispersion in Longmaxi formation Sichuan Longmaxi formation and Wufeng formation. The shale expansion rate was 1.230.95% and 0.98%, respectively, and the recovery rates were 98.94% and 99.05%, respectively. The properties of shale hydration expansion and dispersion inhibition were similar to those of oil-based drilling fluids, and the degree of decrease in shale compressive strength was significantly reduced compared with conventional water-based drilling fluids. It can effectively slow down the decrease of shale compressive strength and has strong plugging ability to shale fractures, and has strong pollution ability (5%Na Cl), bentonite (5%) and cuttings (20% drilling debris), and has a good effect on stabilizing wellbore.
【作者单位】：中国石油勘探开发研究院;中国石油集团钻井工程技术研究院;
【基金】：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)资助
【分类号】：TE254

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