压裂酸化技术在滇东南不纯碳酸盐岩热储中的应用

APPLICATION OF FRACTURING ACIDIFICATION TECHNOLOGY IN THERMAL STORAGE OF IMPURITY CARBONATE ROCKS IN SOUTHEAST YUNNAN

滇东南某地热井完井后,为达到水量和水温要求,运用压裂与酸化洗井联合增产工艺,成功扩大热储裂隙及其相互之间的连通性,增强了热储层的渗透性,产量由120m^(3)/d增加到508m^(3)/d,井口水温由38℃升高到60℃。该地热井的成功实践证明,油田开采使用的酸化压裂增产技术简化后用于碳酸盐岩夹层和互层型热储热水开采,可供类似地质条件的开采井工程借鉴。

After the completion of a geothermal well in southeastern Yunnan,a combined stimulation process of fracturing and acid washing was used to meet the requirements for water volume and temperature,which giving rise to successfull expansion of the thermal reservoir fractures and their connectivity,and the enhancement of permeability of the thermal reservoir.The production rate increased from 120m^(3)/d to 508m^(3)/d,and the water temperature at the wellhead has increased from 38℃to 60℃.The successful practice of this geothermal well has proven that the simplified acid fracturing stimulation technology used in oilfield exploitation can be used for the extraction of carbonate rock interlayer and interbedded thermal water storage,which can be taken as a reference for mining well engineering in similar geological conditions.