河南WR-1地热井降压试验水位校正的应用研究

Application research of water level correction in depressurization test of WR-1 geothermal well,Henan

一般的单井稳定流抽水试验,可直接利用从孔口测得的水位降深与对应的流量关系,求取含水层的水文地质参数。但对地热井而言,由于在抽水过程中,井筒内水温的变化可对井中水位产生较大影响,故不宜直接利用降压试验前测得的静水位埋深和孔口所测的水位降深值,而应该进行静水位和动水位的校正(刘永贵,2016),才能与观测的水位埋深、水量、水温相匹配进行参数计算(高新智,2015)。文章以尉氏县WR-1地热井馆陶组降压试验静水位、动水位校正实例,阐述地热井降压试验水位校正的有效性和必要性。

The general single well steady flow pumping test can directly use the relationship between the water level drop depth measured from the orifice and the corresponding flow rate to obtain the hydrogeological parameters of the aquifer. However,for geothermal wells,because the change of water temperature in the wellbore can have a great impact on the water level in the well during the pumping process,it is not appropriate to directly use the static water level depth measured before the depressurization test and the water level drop value measured at the orifice,but to correct the static water level and dynamic water level so as to calculate the parameters matching the observed water level depth,water volume and water temperature. Based on the static water level and dynamic water level correction examples in the depressurization test of Guantao Formation of WR-1 geothermal well in Weishi County,this paper expounds the effectiveness and necessity of water level correction in the depressurization test of geothermal well.