地质学报2025，Vol.99Issue(4)：1409-1426,18.DOI:10.19762/j.cnki.dizhixuebao.2023087
地热水开发采灌井热突破距离计算影响因素研究
Analysis on influencing factors for calculation of thermal breakthrough spacing between pumping well and recharging well:A case study in Xiong'an New Area
摘要
Abstract
It is more important to expand the applicability of the Gringarten formula for calculating the safe spacing to prevent thermal breakthrough between pumping and recharging wells,and to ensure the practical utility of the formula's results.Initially,the formula was simplified by analyzing its characteristics,and the differences in the influence of geological parameters such as the effective thickness,porosity,and permeability of the thermal reservoir,which reflect its heterogeneity,on the simplified formula's results were studied.Subsequently,a preliminary application of the formula was carried out in the Xiong'an New Area.The results show that the simplified formula is concise and easy to calculate.When the effective thickness of the thermal reservoir is greater than 90 m or the production time is less than 25 years,the calculation results difference between the simplified formula and the original formula is generally less than 2％,and the maximum difference is less than 13％.Effective thickness emerged as the most influential parameter affecting accuracy.Within the formula's practical range,defined as a relative error below 20％,the error caused by the effective porosity factor remained below 1.4％,reaching a maximum of 6％only under extreme conditions.Remaining errors are attributed to the effective thickness factor of the thermal reservoir.Changes in the effective thickness of the thermal reservoir have a more pronounced impact on the thermal breakthrough well spacing value than equivalent changes in effective porosity.The influence of permeability is encapsulated within that of effective porosity.Other geological factors of the thermal reservoir are of secondary importance.Generally,the average effective thickness and average porosity of the thermal reservoir can be selected as parameters for the formula's calculations.In scenarios involving multiple wells in close proximity,accounting for the influence of interfering wells and then equating them to the well model calculation can significantly reduce errors.In the Xiong'an New Area,where the effective thickness of the thermal reservoir predominantly ranges between 40 m and 300 m,it is essential to ensure that the long-term flow rate of a single recharge well does not exceed 80 m3/h,and the spacing between pumping and recharging wells should preferably be more than 1300 m.The simplified formula for calculating the thermal breakthrough well spacing is not only effective in areas with homogeneous thermal reservoir conditions but also holds practical value in heterogeneous areas where the effective thickness ratio of the thermal reservoir at pumping and recharging wells is between 0.5 and 2.This formula can be applied to study well network deployment and provide technical parameter suggestions in the Xiong'an New Area and other areas that meet the conditions for large-scale development of geothermal water.关键词
热突破距离/采灌井距/非均质热储/有效厚度/孔隙度/渗透率/地热开发井网/雄安新区Key words
thermal breakthrough/spacing between pumping and recharging wells/heterogeneous thermal reservoir/effective thickness/porosity/permeability/geothermal development well network/Xiong'an New Area引用本文复制引用
戴明刚..地热水开发采灌井热突破距离计算影响因素研究[J].地质学报,2025,99(4):1409-1426,18.基金项目
本文为国家重点研发计划"深地资源勘查开采"专项项目(编号2018YFC0604300)和中国石化集团公司科技项目(编号JR22011)联合资助的成果. （编号2018YFC0604300）
