A bull-heading water control technique of thermo-sensitive temporary plugging agent

• 作者: LIU Pingde WANG Longfei WEI Falin XIONG Chunming ZHANG Song ZHU Xiuyu
• 来源期刊: 石油勘探与开发:英文版
• 学科: 工学
• 关键词: bull-heading water control TECHNIQUE THERMO-SENSITIVE TEMPORARY plugging agent SECONDARY TEMPORARY plugging TECHNIQUE thermal degradation property reservoir protection
• 年，卷（期）: 2018,（3）
• 页码范围: 536-543
• 页数: 8页
• 分类号: TE358

摘要

Aimed at the disadvantages of secondary damage to oil layers caused by the conventional bull-heading water control technique, a thermo-sensitive temporary plugging agent for water control was synthesized by water solution polymerization and applied in the field with a new secondary temporary plugging technique. The optimization and performance evaluation of thermo-sensitive temporary plugging agent were carried out through laboratory experiments. The optimized formula is as follows:(6%-8%) acrylamide +(0.08%-0.12%) ammonium persulfate +(1.5%-2.0%) sepiolite +(0.5%-0.8%) polyethylene glycol diacrylate. The thermo-sensitive temporary plugging agent is suitable for formation temperatures of 70-90 ?C, it has high temporary plugging strength(5-40 k Pa), controllable degradation time(1-15 d), the apparent viscosity after degradation of less than 100 m Pa?S and the permeability recovery value of simulated cores of more than 95%. Based on the research results, secondary temporary plugging technique was used in a horizontal well in the Jidong Oilfield. After treatment, the well saw a drop of water cut to 27%, and now it has a water cut of 67%, its daily increased oil production was 4.8 t, and the cumulative oil increment was 750 t, demonstrating that the technique worked well in controlling water production and increasing oil production.