煤层气低温低伤害自悬浮支撑剂性能评价与现场应用

Performance Evaluation and Field Application of Low-Temperature,Low-Damage and Self-Suspending Proppant for Coalbed Methane

为了实现煤层气储层高效开发,需要开展储层改造,水力压裂则是最重要的改造手段。面对深部煤储层加砂困难易砂堵、支撑缝长较短、改造范围较小等问题,常规“活性水+石英砂”的砂液组合已无法满足压裂改造需要,因此从支撑剂角度入手,提出一种自悬浮压裂液体系,以提升压裂改造效果。本文对该体系的悬浮性能、流变性能、破胶性能、压裂液破胶液残渣含量、岩心伤害情况开展室内实验评价,结合裂缝导流能力模拟、裂缝监测结果和实际产气量验证了自悬浮支撑剂与石英砂的组合加砂模式可以提高压裂改造效果,大幅提升煤层气井的产气量,可进一步应用于现场。

To achieve efficient development of coalbed methane reservoirs,reservoir reconstruction is necessary,with hydraulic fracturing being the most crucial method.Due to issues such as difficult sand addition,easy sand plugging,short support joint length,and limited reconstruction range,the conventional sand liquid combination of"active water+quartz sand"can no longer meet the needs of fracturing reconstruction.Therefore,a self-suspending fracturing liquid system is proposed from the perspective of proppant to improve the effectiveness of fracturing reconstruction.In this paper,laboratory experiments are carried out to evaluate the suspension performance,rheology performance,glue-breaking performance,fracture fluid residue content and core damage of the system.Combined with fracture conductivity simulation,fracture monitoring results and actual gas production,it is verified that the sand addition mode with a combination of self-suspending proppant and quartz sand could improve the fracturing effects and significantly increase gas production of coalbed methane wells.This approach can be further applied in field operations.