| 一种适用于长宁页岩气井的高效洗油隔离液 |
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| 引用本文： | 涂思琦,谢飞燕,敖康伟,张天意,甄克力.一种适用于长宁页岩气井的高效洗油隔离液[J].钻井液与完井液,2022,39(1):82-86. |
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| 作者姓名： | 涂思琦 谢飞燕 敖康伟 张天意 甄克力 |
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| 作者单位： | 1.天津中油渤星工程科技有限公司, 天津 300451 |
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| 基金项目： | 中国石油集团海洋工程有限公司课题“ 页岩气井固井工作液技术研究与应用”（2019 F-D83019K7） |
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| 摘 要： | 针对长宁页岩气水平井所用油基钻井液与水泥浆兼容性差，絮凝混浆滞留环空难以驱替干净的问题，根据表面活性剂的类型、作用原理及HLB值进行设计，开发了洗油冲洗剂BCS-130L，并形成了一种适用于长宁页岩气井的高效洗油隔离液体系。该体系在70～180 ℃，密度为1.5～2.4 g/cm3时可清除环空壁面的油基钻井液，实现界面润湿性能反转，流变性与稳定性良好，与现场钻井液和水泥浆相容性良好，满足长宁页岩气目的层固井要求。
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| 关 键 词： | 页岩气井 隔离液 润湿反转 冲洗效果 相容性 |
| 收稿时间： | 2021-09-27 |
A High Efficiency Oil Wash Spacer for Shale Gas Wells in Changning Oilfield |
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| Affiliation: | 1.CNPC Tianjin Boxing Engineering Science & Technology Co., Ltd., Tianjin 3004512.CNPC Key Laboratory of Drilling Engineering; Laboratory of Cementing Technology, Tianjin 3004513.National Engineering Laboratory of Petroleum Drilling Technology, Tianjin 3004514.Downhole Services Company BHDC, Tianjin 300451 |
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| Abstract: | The oil based drilling fluids used in horizontal drilling of shale gas wells in Changning oilfield are poorly compatible with the cement slurries, resulting in the mixture of the drilling fluid and cement slurry flocculated and difficult to displace from the annular spaces. To solve this problem, an oil wash additive BCS-130L was developed based on the types, functioning principles and HLB levels of surfactants. A high efficiency oil wash spacer was developed using BCS-130L, which is suitable for use in Changning. This spacer, with its density ranging between 1.5 g/cm3 and 2.4 g/cm3, can work normally at temperatures between 70 ℃ and 180 ℃; it cleans the oil based drilling fluids held up on the surface of the annular spaces and reverses the wettability of the surfaces. The spacer has good rheology and stability and is compatible with the drilling fluid and the cement slurry in use, it has satisfied the requirements of shale gas well cementing in Changning oilfield. |
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