煤层气经济井网密度优化模型及应用

CBM Economic Well Density Optimization Model and Application

经济因素对煤层气开发效益影响巨大,以往的井网密度优化研究集中在资源和技术层面,并未就井网密度对全生命周期内项目开发效益的影响进行深入分析,技术最优的井网密度不一定能获取最大的开发效益,因此有必要从开发效益的角度建立煤层气井网密度优化模型。通过分析受井网密度影响的现金流入与流出,拟合量化井网密度对采收率的影响,基于井网密度对勘探、钻井、压裂、地面工程建设等投资和经营成本、利息、税费等费用以及销售、补贴、返税等收入进行计算,最终基于折现现金流法建立了技术经济视角下的井网密度优化模型,并通过插值法和搜索算法实例运用了该模型,求取了示例区块的最优井网密度。煤层气开发经济井网密度优化模型作为资源技术类优化井网密度方法的补充,对煤层气开发设计中的井网部署具有重要的参考价值与指导意义。

Economic factors have a great impact on the benefits of CBM development. Previous research on well pattern density optimization focused on resources and technology. There is no in-depth analysis of the impact of well pattern density on project development benefits in the whole life cycle. The technically optimal well pattern density of the technology does not necessarily achieve the maximum development benefit. Therefore, it is necessary to establish a CBM well pattern economic-optimization model from the perspective of development efficiency. By analyzing the cash inflows and outflows affected by the density of the well network, the effect of well pattern density on recovery has been quantified, and the investments of exploration, drilling, fracturing and ground construction, the costs of operating, interest and taxes, the imcomes of sales, subsidies and tax returns have been calculated. Finally, the well pattern optimization model was established based on the discounted cash flow method. The model is applied by interpolation and search algorithm to obtain the economic optimal well pattern density of the example block. As an supplement to the resource and technology optimization well pattern density methods, the economic well pattern optimization model of CBM development has important reference value and guiding significance for the CBM well network deployment.