和顺区块煤层气井产能影响因素研究

摘要

Aiming at great differences of gas production rate, by researching from geology and engineering, we concluded that CBM wells deliverability in Heshun block was mainly affected by CBM preservation conditions, desorption pressure, fracturing, and pro-duction controlling. The research shows that CBM preservation conditions control the gas content of coalbed, having great effects on deliverability. The higher desorption pressure is, the greater potential for high and stable productivity is. In Heshun block, interwell pressure appears easily in hydraulic fracturing of structural high parts. Liquid producing capacity and permeability are low. Accord-ing to the water production potential of coalbed, the feed flow indexes of single-phase flow phase are calculated, empirical formula is established, reasonable production speed is determined, thereby providing some guiding significances for production.%针对和顺区块煤层气井产气量差异较大的特点，从地质和工程两个方面展开研究，确定和顺区块煤层气井产能主要受到煤层气保存条件、解吸压力、压裂以及排采控制等因素的影响。研究表明，和顺区块煤层气的保存条件控制煤层含气性，对产能的影响明显；解吸压力越高，高产稳产潜力越大；区块构造高部位水力压裂易出现井间压窜现象；和顺区块煤层产液量及渗透率低，按照煤层的产水潜能，在单相流阶段求取煤层供液指数，并依此建立经验公式，确定合理的排采速度，对生产具有一定的指导意义。