钻井液用高吸水性树脂的防漏堵漏性能研究

Research on High Water Absorbent Resin for Leak Prevention and Sealing in Water-based Drilling Fluid

罗平亚 代锋 刘应民 贺佳宁 白杨

LUOPingya DAIFeng LIUYingmin HEJianing BAIYang

西南石油大学石油与天然气工程学院, 四川 成都 610500 油气藏地质及开发工程全国重点实验室·西南石油大学, 四川 成都 610500 四川长宁天然气开发有限责任公司, 四川 成都 610000 油气钻完井技术国家工程研究中心, 北京 昌平 102200

Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China Geological Engineering Department of Sichuan Changning Natural Gas Development Co. Ltd., Chengdu, Sichuan 610000, China National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Changping, Beijing 102200, China

针对采用水基钻井液开采页岩油气藏时，容易因页岩含黏土颗粒、天然裂缝等导致井漏且无法堵漏成功的问题，以丙烯酸和聚乙烯醇为单体，N，N'-亚甲基双丙烯酰胺为化学交联剂，采用响应曲面法并以吸水倍率为响应目标，对实验因素进行优化，通过自由基溶液聚合制得一种PAA（聚丙烯酸）和PVA（聚乙烯醇）互穿网络结构的高吸水性树脂堵漏剂。采用红外、热重和扫描电镜分析验证了堵漏剂的合成成功并具备热稳定性。利用封堵及承压能力实验、砂床实验和微裂缝模拟实验对堵漏剂的承压堵漏性能进行评价。实验结果表明，堵漏剂具备良好热稳定性，在裂缝宽度为2 mm，温度为180 ℃，堵漏剂加量为3%，围压为10 MPa条件下，最高承压能力为6.08 MPa，高温高压滤失量为9 mL，能够有效实现页岩地层中水基钻井液的堵漏目标。

To address the problem of wellbore leakage caused by clay particles and natural fractures in shale oil and gas reservoirs using water-based drilling fluids, which cannot be successfully plugged, acrylic acid and polyvinyl alcohol are used as monomers, N, N'-methylene bisacrylamide is used as a chemical crosslinking agent, and the response surface method is adopted with water absorption rate as the response target. The experimental factors are optimized, and a PAA/PVA interpenetrating network structure high water absorbent resin plugging agent is prepared through free radical solution polymerization. The successful synthesis and thermal stability of the plugging agent were verified by infrared, thermogravimetric, and scanning electron microscopy analysis. Evaluate the pressure sealing performance of the plugging agent through sealing and pressure bearing capacity experiments, sand bed experiments, and micro crack simulation experiments. The test results show that the plugging agent has good thermal stability. Under the conditions of a fracture width of 2 mm, a temperature of 180 ℃, a plugging agent dosage of 3%, and a confining pressure of 10 MPa, the maximum pressure bearing capacity is 6.08 MPa, and the high-temperature and high-pressure filtration loss is 9 mL. It can achieve the plugging effect of water-based drilling fluid in shale formations.

10.11885/j.issn.1674-5086.2024.07.03.02