煤层气井酸液体系优选实验研究

Experimental Study on Optimization of Acid-liquid System of Coalbed Methane Well

鉴于煤层气储层非均质性严重、机械强度低、割理发育和孔隙度以及渗透性非常低的特性,导致煤层气的扩散和渗流较差,因此采用酸化工艺恢复或提高地层孔隙和裂隙的渗透性是重要的增产措施之一。在施工作业前,选用特定煤岩模拟储层环境开展酸化实验显得尤为关键。结合区块地层物性,通过初选的酸液体系,开展酸化室内实验,优选出与储层流体配伍性好、有效提高地层渗透率的酸液类型和酸液添加剂。

In view of the serious heterogeneity of coalbed methane reservoirs,low mechanical strength,cleat development,very low porosity and permeability,resulting in poor diffusion and seepage of coalbed methane,the acidification process is one of the important measures to restore or improve formation permeability to increase production.Before construction operations,it is particularly critical to select specific coals to simulate the reservoir environment and carry out acidification experiments.Based on the physical properties of the block formation,the acidification laboratory experiment was carried out through the preliminary selection of acid liquid system,and the acid liquid type and acid liquid additives being compatible with the reservoir fluid and effectively improving the permeability of the formation were selected.