助破胶胶囊型压裂屏蔽暂堵保护剂的制备与性能评价  

Preparation and Performance Evaluation of Helper-breaking Capsule Type Shielding Temporary Plugging Protection Agent in Fracturing

作　　者：张汝生[1] 王增宝[2,3] 赵梦云 刘长印[1] 孙志宇[1] 纪圆[2] 赵修太 ZHANG Rusheng;WANG Zengbao;ZHAO Mengyun;LIU Changyin;SUN Zhiyu;JI Yuan;ZHAO Xiutai(Beijing),Beijing 100083,P R of China)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]中国地质大学(北京)能源学院,北京100083

出　　处：《油田化学》2019年第2期225-229,共5页Oilfield Chemistry

基　　金：国家重大科技专项“致密碎屑岩储层伤害机理及储层保护与修复技术研究”(项目编号2016ZX05002-005-010)

摘　　要：为降低压裂过程中压裂液滤失侵入储层、破胶后的固相残渣等给储层带来的伤害,基于屏蔽暂堵油气层保护理论,结合微胶囊破胶剂的特点,以有机酸为芯材、乙基纤维素为囊材、聚乙烯吡咯烷酮为致孔剂、聚乙烯醇为保护剂,采用液中干燥法制备了助破胶胶囊型压裂屏蔽暂堵保护剂TD-1,优选了制备工艺条件,评价了TD-1的性能。结果表明,在聚乙烯醇加量2.0%、乙基纤维素与聚乙烯吡咯烷酮加量4.0%、搅拌速率为500r/min的条件下制得的TD-1主要粒径约为300μm,包覆芯材有机酸的含量为34.1%,释放率为69.0%。TD-1有助于压裂液的破胶,可使压裂液破胶液黏度降低35.6%,固相残渣含量降低44.9%,并对压裂液黏度与破胶时间的影响较小。TD-1可在储层表面形成暂堵带,降低压裂液滤液、固相物质侵入储层造成伤害,提高渗透率恢复率11.32%,使岩心渗透率恢复率达82.47%,具有良好的屏蔽暂堵保护油气层的作用。In order to reduce the damage to the reservoir caused by the leakage of fracturing fluid and the solid phase residue after breaking the gel,based on the shielding temporary plugging oil and gas layer protection theory and the characteristics of microcapsule breaker,the helper-breaking capsule type shielding temporary plugging protection agent in fracturing named TD-1 was prepared by liquid drying method,which used organic acid as the core material,ethyl cellulose as the capsule material, polyethylene pyrrolidone as the porogen,and polyvinyl alcohol as the protective agent. The preparation condition was optimized and the performance of TD-1 was evaluated. The results showed that the main particle size of TD-1 was about 300 μm,the content of organic acid in coated core material was 34.1%,and the release rate was 69.0%,when TD-1 was synthesized under the condition of 2.0% polyvinyl alcohol,4.0% ethyl cellulose and polyvinyl pyrrolidone,and 500 r/min stirring rate. TD-1 was helpful for gel breaking of fracturing fluid,which could reduce the viscosity of fracturing fluid by 35.6% and the solid residue content by 44.9%. Meanwhile TD-1 had little effect on the viscosity of fracturing fluid and gel breaking time. TD-1 could form a temporary plugging zone on the surface of reservoir,which could reduce the invasion damage caused by the fracturing fluid filtrate and solid phase material. TD-1 improved the permeability recovery rate by 11.32% and made the core permeability recovery rate reached 82.47%, showing good effect on temporary shield plugging reservoir.

关 键 词：压裂液 微胶囊 屏蔽暂堵 破胶剂 储层保护 

分 类 号：TE357[石油与天然气工程—油气田开发工程]