聚（MM-EM-BM）作为油基钻井液纳米密封材料的研究：合成与评价

Investigation of Poly(MM-EM-BM) as Nanosealing Materials in Oil-Based Drilling Fluids: Synthesis and Evaluation.

作者信息

Li Daqi, Wang Xianguang, Wang Ruolan, Han Zixuan, Chen Yu, Xie Gang

机构信息

State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Sinopec Research Institute of Petroleum Engineering, Beijing 102206, China.

State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China.

出版信息

ACS Omega. 2023 Feb 23;8(10):9291-9297. doi: 10.1021/acsomega.2c07516. eCollection 2023 Mar 14.

DOI:10.1021/acsomega.2c07516

PMID:36936280

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10018717/

Abstract

Nanosealing technology has become the key to overcoming the wellbore instability problem in deep and ultradeep shale formations. In this Article, the terpolymer poly(MM-EM-BM) was synthesized from methyl methacrylate, ethyl methacrylate, and butyl methacrylate by a Michael addition reaction. The poly(MM-EM-BM) nanoparticles were investigated by Fourier transform infrared spectroscopy, laser scattering analysis, and thermogravimetric analysis. The results imply that the particle size range of poly(MM-EM-BM) is between 33.90 and 135.62 nm and the average diameter is about 85.95 nm at room temperature, which can maintain excellent stability at 382.75 °C. The effects of poly(MM-EM-BM) on the properties of oil-based drilling fluids (OBDFs) were ascertained through experiments on the rheological performance, electrical stability, and high-temperature and high-pressure (HTHP) filtration loss. The results suggested that when the amount of added poly(MM-EM-BM) increases, the apparent viscosity, plastic viscosity, dynamic shear force, and demulsification voltage of the drilling fluids will increase correspondingly; in contrast, the HTHP filtration loss gradually decreased. When poly(MM-EM-BM) is added at 0.75%, the kinetic-to-plastic ratio of the drilling fluids is 0.24 and the filtration loss is 0.6 mL, showing excellent overall performance. The drilling fluids have a good rock-carrying ability and water loss wall-building property. The sealing performance and mechanism of poly(MM-EM-BM) were researched by the method of a sealing performance test under high temperature. The results indicated that the more poly(MM-EM-BM) used, the higher the sealing efficiency of the mud cake and the core as the sealing medium. When poly(MM-EM-BM) was added at 0.75%, the sealing rates of the mud cake and the core as the sealing medium reached the maximum sealing rates of 40.30% and 91.48%, respectively. When poly(MM-EM-BM) enters the core nanopore joint for a certain distance under formation pressure, a tight sealing layer will be formed to effectively prevent the entry of filtrate. Poly(MM-EM-BM) as a potential oil-based nanosealing agent is expected to solve the problem caused by wellbore instability in shale horizontal wells.

摘要

纳米密封技术已成为克服深层和超深层页岩地层井壁失稳问题的关键。在本文中，通过迈克尔加成反应由甲基丙烯酸甲酯、甲基丙烯酸乙酯和甲基丙烯酸丁酯合成了三元共聚物聚（MM-EM-BM）。通过傅里叶变换红外光谱、激光散射分析和热重分析对聚（MM-EM-BM）纳米颗粒进行了研究。结果表明，聚（MM-EM-BM）的粒径范围在33.90至135.62纳米之间，室温下平均直径约为85.95纳米，在382.75℃时可保持优异的稳定性。通过对流变性能、电稳定性以及高温高压（HTHP）滤失量的实验，确定了聚（MM-EM-BM）对油基钻井液（OBDF）性能的影响。结果表明，随着聚（MM-EM-BM）添加量的增加，钻井液的表观粘度、塑性粘度、动切力和破乳电压会相应增加；相反，高温高压滤失量逐渐降低。当聚（MM-EM-BM）添加量为0.75%时，钻井液的动塑比为0.24，滤失量为0.6毫升，显示出优异的综合性能。该钻井液具有良好的携岩能力和失水造壁性能。通过高温下的密封性能测试方法研究了聚（MM-EM-BM）的密封性能及机理。结果表明，使用的聚（MM-EM-BM）越多，以泥饼和岩心作为密封介质时的密封效率越高。当聚（MM-EM-BM）添加量为0.75%时，以泥饼和岩心作为密封介质的密封率分别达到最大密封率40.30%和91.48%。当聚（MM-EM-BM）在地层压力作用下进入岩心纳米孔隙连接处一定距离时，会形成紧密的密封层，有效阻止滤液进入。聚（MM-EM-BM）作为一种潜在的油基纳米密封剂，有望解决页岩水平井中井壁失稳引起的问题。