煤层气压裂直井与多分支井经济评价对比研究

Contrastive study on economic evaluation of fractured vertical well and multi-lateral well for coal bed methane reservoir

压裂直井和多分支井是目前煤层气增产所采用的主要井型。基于这两种井型,采用净现值法对不同渗透率和不同厚度储层进行了经济评价研究,比较了两种井型在不同条件下的开发技术经济潜力。计算结果表明:多分支井在单井产量方面具有巨大的优势,在经济效益方面,仅在渗透率较低、厚度较薄的储层中优于压裂直井。因此,压裂直井在今后一段时间内仍将是煤层气开发的主力井型,多分支井可以作为压裂直井在特低渗透薄层中的重要补充。

Fractured vertical wells and multi-lateral wells are the main well types used in coal bed methane reservoir.Based on these two kinds of wells,the economic evaluation under different permeability and different layer thickness conditions were studied in this paper using the net present value method,and then the development technical economic potential of these two kinds of wells is compared under different conditions.The results show that：multi-lateral wells have great advantage on the productivity of individual wells.But when it comes to the economic benefit,multi-lateral wells with lower permeability and thin coal bed methane reservoir beat the fractured vertical wells.Therefore,fractured vertical wells will be the dominant well type for a long time in the development of coal bed methane,while multi-lateral wells will play an important role in the low permeability and thin coal bed methane reservoirs.