抽水试验方法和成井工艺类型对热储层水文地质参数的影响

Influence of Pumping Test Method and Well Completion Technology Type on Hydrogeological Parameters of Thermal Reservoir

摘要:

水热型地热资源计算评价中，热储层水文地质参数的选取对地热资源的计算评价起关键性作用。由于地热井的施工成本较高，多数抽水试验没有合适的观测孔，往往采用稳定流抽水试验参数，作为地热资源计算评价的依据，稳定流抽水具有难以避免的局限性，使得人们对热储层水文地质参数不能较为准确的掌握。除试验方法之外，求参方法的选取，以及成井工艺的差别，对热储层水文地质参数均会产生较大影响。该文利用开展地热同层回灌的两眼地热井，分别采用不同抽水试验的方法、求参的方法，和不同的成井工艺类型3种条件，对比分析了热储层水文地质参数的差异及关系，为地热资源计算评价及地热尾水回灌方案提供参考。

Abstract:

The selection of hydrogeological parameters of hydrothermal geothermal resources plays a key role in the calculation and evaluation of geothermal resources. Because of high construction cost of geothermal wells, most pumping experiments do not have suitable observation holes. Steady flow pumping test parameters often are used as the basis for the calculation and evaluation of geothermal resources. Stable flow pumping is difficult to avoid the limitations, thus, hydrogeological parameters of the the thermal reservoir can not be grasped accurately. In addition to the test method, the selection of the method, as well as the differences between the well process will have a greater impact to hydrogeological parameters of the thermal reservoir. In this paper, through study on two geothermal wells of geothermal stratospheric recharge, by using different pumping test methods, seeking parameters method and different types of well forming process, the differences and relations of hydrogeological parameters of thermal reservoirs have been compared and analyzed. It will provide some references for geothermal resource calculation and evaluation and geothermal tailrace recharge scheme.