深层压裂可降解暂堵剂制备及其封堵-降解性能

Preparation of a degradable temporary plugging agent for deep fracturing and its performance of plugging-degradation

摘要

暂堵剂作为暂堵转向压裂的关键材料,其性能影响储层改造效果。采用熔融共混法研发适用于深层储层条件的可降解暂堵剂并优化制备条件,研究其封堵性能和降解性能。结果表明:可降解暂堵剂的最佳制备条件为聚乳酸(PLA)与聚丁二酸丁二醇酯(PBS)质量比8∶2,有机改性蒙脱土(OMMT)加量(质量分数)为2%;当温度160 ℃、矿化度18×10⁴ mg/L时,暂堵剂形成的封堵结构突破压力达20.7 MPa,复配支撑剂混注有效提升封堵结构稳定性,稳压时间延长至206 min;暂堵剂对储层伤害程度低至3.7%,完全降解时间为13.8 h,残渣率仅为4.3%,且其降解过程通过环境pH值进行有效调控。

Abstract

As the key materials for temporary plugging and diverting fracturing, the performance of temporary plugging agents directly affects the effect of reservoir stimulation. The degradable temporary plugging agent suitable for deep reservoir conditions was developed using the melt blending method, and the preparation conditions were optimized to investigate the plugging performance and degradation performance. The results show that the optimal preparation conditions for the degradable temporary plugging agent are as follows: a mass ratio of polylactic acid (PLA) to poly(butylene succinate) (PBS) of 8∶2, and an organic montmorillonite (OMMT) content of 2%. Under conditions of 160 ℃ and a salinity of 18×10 ⁴ mg/L, the plugging structure formed by the agent reaches a breakthrough pressure of 20.7 MPa. Co-injection with a composite proppant significantly enhances the stability of the plugging structure, extending the pressure stabilization time to 206 minutes. The damage degree of the temporary plugging agent to the reservoir is as low as 3.7%, the complete degradation time is 13.8 h, the residue rate is only 4.3%, and the degradation process is effectively controlled by the environmental pH.

关键词

可降解暂堵剂 / 深层压裂 / 封堵性能 / 降解性能

Key words

degradable temporary plugging agent / deep fracturing / plugging performance / degradation performance

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基金资助

国家自然科学基金基础科学中心项目(52288101)