松河井田多煤层资源开发条件及合采储层伤害特征

为了降低煤层气井排采过程中的储层伤害,通过分析松河井田的资源开发条件及煤层气井排采数据,总结各排采阶段不合理排采控制引起的储层伤害特征,提出不同排采阶段合理的排采工艺对策。分析结果表明:松河井田煤层气资源丰度达到2.09×10^8m^3/km^2,煤层气资源开发条件较好;松河井田多煤层合层排采过程中,不合理排采控制工艺对煤层气井的产气量影响较大;排采初期以速敏伤害为主,排采中期以气锁和应力闭合伤害为主;修井作业及停抽期间,气锁效应及应力闭合对煤层造成伤害的可能性增大。合理的排采控制能够有效降低煤层气井的储层伤害,提高煤层气井产气量。

Development conditions of multiple coal seam resources and damage characteristics of co-mining reservoirs in Songhe Mine Field

In order to reduce reservoir damage during the drainage process of CBM wells,by analyzing the resource development conditions and CBM well drainage data of Songhe Mine Field,the characteristics of reservoir damage caused by unreasonable drainage control in each stage were summarized,and the reasonable mining technology countermeasures of different mining stage were put forward.The results show that the abundance of CBM resources in Songhe Mine Field reaches2.09×10^8 m^3/km^2,and the development conditions of CBM resources are good;in the process of multiple coal seam co-mining in Songhe Mine Field,the unreasonable drainage and control technology has a great influence on the gas production of CBM wells;in the initial stage,the main damage is velocity sensitivity,and in the middle stage,the main damage is the gas lock and stress closure;during the period of wells workover operation and stop drainage,the possibility of damage to coal seam caused by gas lock effect and stress closure increases.Rational drainage control can effectively reduce the reservoir damage and increase the gas production of CBM wells.