钻井液与完井液2026，Vol.43Issue(3)：340-348,9.DOI:10.12358/j.issn.1001-5620.2026.03.006
钻井液用自降解屏蔽暂堵剂的制备与性能评价
Preparation and Performance Evaluation of a Self-Degrading Bridging Temporary Plugging Agent for Drilling Fluids
摘要
Abstract
In drilling fractured low-permeability reservoirs,bridging temporary plugging agent particles,because of their large sizes,are difficult to achieve tight plugging,and these particles exhibit low self-degradability.To address these technical challenges,a self-degradable bridging temporary plugging agent SMNP-1 was prepared via inverse microemulsion polymerization and using liquid microfluidics technology.The plugging agent SMNP-1 was synthesized using acrylamide(AM)and sodium p-styrenesulfonate(SSS)as the monomers,and β-cyclodextrin diacrylate ester(β-CD-AA)as the crosslinking agent.The molecular structure of SMNP-1 was verified with infrared spectrometer,and the particle size distribution and micromorphology of SMNP-1 were characterized with laser particle size analyzer and scanning electron microscope(SEM).Laboratory experiments were conducted to investigate SMNP-1 for its water absorption and swelling performance,adsorption performance,temporary plugging and unplugging performance,self-degradability,pressure-bearing capacity,and compatibility.Experimental results demonstrate that at elevated temperatures,SMNP-1 exhibits a moderate volumetric expansion rate after absorbing water,and a strong adsorption capacity.The SMNP-1 particles,after high-temperature treatment,show a normal size distribution and are morphologically nano-micron sized microspheres.At test temperatures of 100℃,120℃,140℃and 160℃,the rates of SMNP-1 to plug natural cores are 96.88%,96.63%,96.57%and 95.27%,respectively.After 240 h of high temperature exposure,the unplugging rates of SMNP-1 are 87.22%,89.95%,93.27%and 96.13%,respectively,and the rates of self-degradation are 52.05%,56.40%,63.04%and 74.11%,respectively,demonstrating remarkable reservoir protection effect.At test temperature of 100℃,the maximum displacement pressure difference is 55 MPa,and a maximum displacement pressure difference of 25 MPa can still be achieved when the temperature is increased to 160℃,demonstrating an excellent plugging performance.SMNP-1 exhibits little effect on the rheology of drilling fluids,it can effectively enhance the wall-building capacity of a drilling fluid after fluid-loss and the reservoir protection effect.SMNP-1 has been successfully applied in the wild-cat well Xinsheng-1.关键词
钻井液/自降解/屏蔽暂堵剂/β-环糊精/凝胶微球/储层保护Key words
Drilling fluid/Self-degrade/Bridging temporary plugging agent/β-cyclodextrin/Gel microsphere/Reservoir protection分类
能源科技引用本文复制引用
穆国臣,褚奇..钻井液用自降解屏蔽暂堵剂的制备与性能评价[J].钻井液与完井液,2026,43(3):340-348,9.基金项目
中国石化科技部科研攻关项目"裂缝性火山岩井筒强化技术研究"(P24152). （P24152）
