钻井液与完井液2025，Vol.42Issue(1)：74-81,8.DOI:10.12358/j.issn.1001-5620.2025.01.008
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
摘要
Abstract
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Key words
Polybutylene terephthalate(PBT)/Polyamide 6(PA6)/Temporary plugging agent/Controllable degrading分类
石油、天然气工程引用本文复制引用
田智元,齐舵,王海波,张馨鹏,郭宝华,徐军..钻井液用可降解聚合物暂堵剂的研制[J].钻井液与完井液,2025,42(1):74-81,8.基金项目
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/JLB12-52). （GCY/JLB12-52）
