低效井产能主控因素下的排采设备适应性分析

煤层气井在开发过程中具有连续、有效排采时间较短及维修作业频繁等特点,因此研究煤层气排采设备的适用性尤为重要。采用多层次模糊综合评价法,从资源条件、产出条件和开发条件等3个方面分析了煤层气低效井产能的主控因素,给出了排采设备的适用性评价。分析结果表明:采用多层次模糊评价方法可以得到影响煤层气井产能的5个指标,即含气量、埋深、渗透率、煤粉产出和排采速度;根据5个主要指标可以有针对性地开展煤层气排采制度和工艺的优化工作。针对煤粉产出和排采速度等两个重要因素,对煤层气排采常用的"三抽"设备、螺杆泵、电潜泵和射流泵等排采设备进行了适应性分析,所得结论可为煤层气低效井的排采设备选用提供指导。

Adaptability of the Production Equipment for Low-Efficiency CBM Wells Considering the Main Factors of the Productivity Control

Coalbed methane(CBM)wells are shorter in continuous effective production time and are maintained frequently in the process of exploitation,so it is quite important to study the adaptability of CBM production equipment.In this paper,the analytical hierarchy process and fuzzy comprehensive evaluation(AHP+FCE)method was adopted to analyze the main factors controlling the productivity of low-efficiency CBM well from three aspects,i.e.,resource condition,output condition and development condition.Then,adaptability of the production equipment was evaluated.It is indicated by virtue of the AHP+FCE method that the productivity of CBM well is mainly affected by five indicators,including gas content,burial depth,permeability,pulverized coal output and production rate.The CBM production system and process can be optimized specifically according to these five main indicators.The adaptability of the commonly used CBM production equipment(e.g."rod-pumping"equipment,progressive cavity pump(PCP),electric submersible pump(ESP)and jet pump)is analyzed from the aspects of pulverized coal output and production rate.The analysis conclusions provide the technical reference for selecting the production equipment of low-efficiency CBM wells.