摘要
地热储层大部分为致密的砂岩储层或裂缝性碳酸盐岩储层,岩性致密,孔隙度小,渗透率极低,需要借助自然裂缝或人工压裂打开流动通道。采用地热井酸压措施评价系统Q-S模型确定地热井产量与动液面下降关系,计算井底最佳压差和最大产水量,提高了地热井措施预判依据的准确性;根据热平衡方程,计算最大产水量的有效供热面积,为地热井酸化压裂施工效果评价提供定量数据。采用该评价系统对河南濮阳、山西太原、河北辛集等地热井进行施工评价,依据施工投入费用和产出效益计算出投资回收期、投入产出比等经济评价指标,为地热井酸化压裂后投产泵深及产水量的确定提供了合理依据。
Most geothermal reservoirs are tight sandstone or fractured carbonate reservoirs with tight lithology,small porosity and extremely low permeability,which require natural fractures or artificial fracturing to open the flow channel.The Q-S model of the acid pressure measure evaluation system of geothermal well was used to determine the relationship between the production of geothermal well and the drop of dynamic fluid level,calculate the best pressure difference at the bottom hole and calculate the maximum water production,which improved the accuracy of the prediction basis of geothermal well measure.According to the heat balance equation,the effective heating area of maximum water production is calculated,which provides quantitative data for the evaluation of acidizing fracturing construction effect of geothermal Wells.The evaluation system is used to evaluate the construction of geothermal Wells in Henan Puyang,Shanxi Taiyuan and Hebei Xinji,etc.According to the construction input cost and output benefit,the payback period,input output ratio and other economic evaluation indexes are calculated,which provides a reasonable basis for the determination of pump depth and water production after acidizing fracturing of geothermal Wells.
作者
郑桐
ZHENG Tong(Sinopec Henan Oilfield Branch Petroleum Engineering Technology Research Institute,Nanyang,Henan 473132,China)
出处
《油气井测试》
2022年第6期34-39,共6页
Well Testing
基金
中国石油化工集团有限公司项目“灰岩热储重点区块酸压技术研究”(2018JP17018)。
