中深层砂岩热储回灌井参数优化模拟  

Simulation on Parameters Optimization of Middle Deep Sandstone Heat Storage and Recharge Wells

作　　者：王磊[1,2] WANG Lei(SINOPEC Research Institute of Petroleum Engineering,Beijing 100101,China;College of Safety and Ocean Engineering,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油化工股份有限公司石油工程技术研究院,北京100101 [2]中国石油大学(北京)安全与海洋工程学院,北京102249

出　　处：《科学技术与工程》2023年第5期1823-1832,共10页Science Technology and Engineering

基　　金：国家重点研发计划(2019YFC0604904,2019YFB1504201,2021YFE0111400);国家自然科学基金重大项目(52192624)。

摘　　要：砂岩热储回灌对于地热能源的高效利用和土壤环境的保护具有重要的意义。华北地区中深层孔隙型砂岩地热回灌效率低下,回灌参数优化不准确,需要对中深层砂岩热储回灌井参数进一步优化研究,提升回灌效率。因此开展有关中深层砂岩热储回灌井参数优化模拟的研究尤为重要。建立了基于CMG-STARS的华北地区砂岩热储定向井的回灌与采出模型,分别研究了完井方式、单日回灌量、水层厚度比及采灌井径对地热回灌效率的影响,并分析优化中深层砂岩热储的回灌井参数。结果表明:完井方式是影响回灌效率的最主要因素,依次是单日回灌量、采灌井井径、水层厚度。为提高回灌效率,通过模拟研究优选出参数方案为表皮系数的最佳数值为0和5,单日回灌量在1600 m^(3)左右,采灌井径为215.9~241.3 mm,水层厚度比为0.33~1。结合造井成本因素,采灌井型选用“一定向井”回灌“一定向井”生产模式,其回灌效率明显高于“一定向井”回灌“一直井”生产模式。The reinjection of sandstone thermal storage is of great significance for the efficient utilization of geothermal energy and the protection of soil environment.The geothermal reinjection efficiency of medium deep porous sandstone in North China is low,and the optimization of reinjection parameters is not accurate,so it is necessary to further optimize the reinjection well parameters of medium deep sandstone thermal reservoir to improve the reinjection efficiency.The recharge and recovery model of directional wells for sandstone heat storage in North China was established based on CMG-STARS.The effects of well completion mode,single-day recharge amount,water layer thickness ratio and well diameter on geothermal recharge efficiency were studied respectively,and the recharge well parameters for middle and deep sandstone heat storage were analyzed and optimized.The results show that the completion mode is the most important factor affecting the injection efficiency,which is followed by one-day injection volume,well diameter and water layer thickness.In order to improve the recharge efficiency,the optimal parameters of skin coefficient are 0 and 5,the daily recharge volume is about 1600 m^(3),the well diameter is 215.9~241.3 mm,and the water layer thickness ratio is 0.33~1.Combined with the factors of well construction cost,the production mode of“one directional well”and“one directional well”is selected for the production mode of“one directional well”and“one directional well”,and its recharge efficiency is obviously higher than that of“one directional well”and“all the way well”.

关 键 词：砂岩地热 回灌效率 回灌参数 表皮系数 地热定向井 

分 类 号：N33[自然科学总论] P314[天文地球—固体地球物理学]