摘要
在煤层气钻井及煤层压裂改造过程中会产生大量煤粉,煤粉沉降会堵塞煤岩地层裂缝和割理,严重影响煤层气井的产能。为了解决此难题,针对韩城区块研发了煤粉悬浮剂FYXF-3,并对其进行了室内评价和现场煤层气压裂方案设计。实验结果表明,浓度不小于0.3%的煤粉悬浮剂溶液可以稳定悬浮裂缝和井筒中的煤粉,使煤粉随排采液一同流出到地面;同时可以降低液体表面张力,增加液体排采效率,使其对地层的伤害程度小于常规活性水压裂液。在此基础上,根据韩城区块煤岩特性,设计了现场煤层气压裂改造实施方案,并进行了现场应用,取得了预期效果。
In coal-bed methane(CBM) drilling and coal bed fracturing operations, coal powder generated, if deposited on the bottom of the hole, imposes severe negative effect on the productivity of the CBM well. A coal powder suspending agent, FYXF-3, was developed aimed at solving this problem. FYXF-3 at concentrations not less than 0.3% can suspend coal powders in good stability, ensuring their flow to the surface along with production fluid. FYXF-3 had the ability to reduce surface tension of liquid, enhancing the production efficiency and minimizing formation damage. Based on these studies and the characteristics of the coal bed in Hancheng area, a reasonable fracturing program was designed and applied successfully in field operations.
出处
《钻井液与完井液》
CAS
北大核心
2015年第3期30-34,105,共5页
Drilling Fluid & Completion Fluid
基金
国家科技重大专项"大型油气田及煤层气开发"(2011ZX05031)资助
关键词
悬浮剂
煤粉
煤层气压裂
表面张力
实施方案
Suspending agent
Coal powder
Coal bed fracturing
Surface tension
Operation program
