钻井液用可降解聚合物暂堵剂的研制  

Development of a Biodegradable Polymer Temporary Plugging Agent for Drilling Fluid

作　　者：田智元 齐舵 王海波[3] 张馨鹏 郭宝华[2] 徐军[2] TIAN Zhiyuan;QI Duo;WANG Haibo;ZHANG Xinpeng;GUO Baohua;XU Jun(School of Materials Science and Engineering,Shenyang University of Chemical Technology,Shenyang,Liaoning 110142;Department of Chemical Engineering,Tsinghua University,Beijing 100084;SINOPEC Research Institute of Petroleum Engineering Co.,Ltd.,Beijing 102206)

机构地区：[1]沈阳化工大学材料科学与工程学院,辽宁沈阳110142 [2]清华大学化学工程系,北京100084 [3]中国石化石油工程技术研究院有限公司,北京102206

出　　处：《钻井液与完井液》2025年第1期74-81,共8页Drilling Fluid & Completion Fluid

基　　金：中国石化石油工程技术研究院与清华大学化工系联合研发项目“可降解封堵材料研究”(GCY/JL B12-52)。

摘　　要：生物可降解聚酯类暂堵剂的降解性较好,对储层伤害较小,但是具有耐温性不足、封堵强度较小、生产成本较高等问题,导致其目前难以广泛应用。为了满足更高温度条件下暂堵剂的需求,采用水解速率更慢的聚对苯二甲酸丁二酯(PBT)和聚酰胺6(PA6)熔融共混,并加入环氧扩链剂ADR提高共混物的相容性,制备出耐温性能较好、封堵强度较高,并且降解速率可调控的可降解暂堵剂。实验结果表明,制备出的暂堵剂具有较好的降解性能,暂堵剂在120~150℃钻井液条件下(pH=10的NaOH水溶液)降解20~60 d后的失重率均大于80%;当共混比例为70%PBT/30%PA6,并加入1.5%ADR时,暂堵剂的抗压强度可达91 MPa、150℃降解16 h后仍大于70 MPa;与钻井液的配伍性较好,并且封堵性能优良,120℃降解14 d后仍然具有2 MPa的封堵强度。Biodegradable polyester temporary plugging agents(TPAs)have good degradability and low damage to reservoirs,but the disadvantages,which include low thermal stability,low strength of the plugging layers formed and high production cost etc.,make it difficult for them to be widely used.To satisfy the requirements for TPAs to work at elevated temperatures,a new biodegradable TPA is developed.This new TPA is prepared by melt blending polybutylene terephthalate(PBT),which has slower hydrolysis rate,and polyamide 6(PA6),and an epoxy chain extender ADR is added to improve the compatibility of the melt blending materials.The new TPA has better thermal stability and forms plugging layers of higher strength.Experimental results show that the new TPA has better degradability,in a NaOH solution(pH=10)at 120-150℃,percent weight loss of the new TPA after 20-60 d is greater than 80%.When the ratio of PBT and PA6 in the melt blending system is 70%PBT/30%PA6,and into the melt blending system add 1.5%ADR,the compressive strength of the new TPA can be 91 MPa,after degrading at 150℃for 16 h the compressive strength is still greater than 70 MPa.This new TPA has good compatibility with drilling fluids and excellent plugging performance,and after degrading at 120℃for 14 d,the residual compressive strength of the plugging layer is 2 MPa.

关 键 词：聚对苯二甲酸丁二酯(PBT) 聚酰胺6(PA6) 暂堵剂 可控降解 

分 类 号：TE258[石油与天然气工程—油气井工程]