压降监测数据分析在煤层气压裂效果评价中的应用——以山西保德井区为例

Application of Analysis on the Monitoring Data of Pressure Drop in CBM Fracturing Effect's Evaluation——Taking Baode Oil Region in Shanxi As an Example

煤层气工业产量的获得,主要依赖于压裂改造技术。压裂停泵后的压力变化反映了裂缝本身及其周围地层的情况。利用压裂停泵后的压力测试数据,与试井分析理论及油气渗流理论相结合,针对其压力递减规律,对关井压降监测数据进行试井分析,确定裂缝导流能力、裂缝半长、地应力等有关特征参数,从而有效分析评价压裂施工造缝效果和压裂施工质量,为优化煤层气井压裂设计、指导和制定煤层气开发方案提供科学的参数依据。

For obtaining CBM industrial output,the fracturing technology is mainly depended on. Fracturing pressure changes after the pump stops reflect crack and its formation conditions. By using fracturing pressure testing data after the pump stops,and the combination of well testing analysis theory and oil and gas seepage theory,according to the law of diminishing pressure,the pressure drop monitor data of the closed well test is analyzed to determine the relative parameters of fracture flow capacity,fracture half length,stress,so as to effectively analyze and evaluate the fracturing effect and the fracturing operation quality,which provides a scientific parameters basis for optimizing fracture design in coal-bed gas field,guides and develops coal-bed gas development plan.