煤层气排采技术评价与设备优选

针对煤层气井开采条件和排采参数动态变化的特点,建立煤层气排采技术多层次模糊评价体系。应用AHP方法计算指标体系的权重向量,考虑各项指标在工程总体上的地位和作用,量化了单一指标的不同重要程度。通过对不同排采方案的开采条件、井下状况、维修管理、投资成本等进行综合对比分析,选择最佳排采设备,使设备的评价和选型结论更具有可比性和客观性。现场应用表明:排水量较低、井眼轨迹尚好的井选用有杆泵排采方式;对于煤粉含量较高、井眼轨迹较好、排水量适中的井,可考虑采用螺杆泵开发;高含水量、斜井、井眼轨迹相对较差的煤层气井,需要优先选用潜水电泵进行开发。

Evaluation of Discharge Technology and Optimal Selection of Equipments on CBM Wells

Targeted for the dynamic-change Characteristics of mining conditions and extractive pa- rameters on CBM wells, the multi-level fuzzy evaluation system was established in discharge tech- nology on CBM wells. Fully considering the status and role of every index in the overall project, the weight of evaluation index system was calculated by AHP method, quantizing the degree of importance of single index. The factors of different equipments, such as the mining conditions, un- derground status,maintenance management, investment cost, were counted in the comparative a- nalysis and economic indicators demonstrate. As a result, the best discharge equipment was fig- ured out, which was comparable and objective. The site engineering practice shows that this evalu- ation of technology and optimization was scientific and effective, convenient and quick. And it should be promoted and applied in CBM drainage fields.