摘要
地下水源热泵系统常会出现抽水井泵砂、抽水井和回灌井堵塞等问题,影响系统的正常运行或系统效率。以湖北省荆州市某地下水源热泵工程为例,分析了江汉平原广泛分布的卵砾石夹细砂含水层中成孔方法选择、滤料及过滤管设计中存在的问题;指出了目前在过滤管外包不锈钢丝网是防止在细砂层中水井泵砂的有效手段之一,但宜与泥浆密度轻、对地层污染小的反循环成孔工艺配合使用,且仍要根据含水层的颗粒级配曲线选择滤料,发挥滤料的过滤作用,避免过滤压力转移到包网过滤管,以减少抽水井堵塞。
Sand entry and well clogging in the groundwater heat pump system often affect the operation and efficiency of the system.Taking a project in Jingzhou City as an example,analysis is made of selection of the water well drilling method in gravel with fine sand aquifer occurring widely in Jianghan Plain and the problems with pack material and the screen design.It is pointed out that one of the effective means to prevent sand entry from the fine sand layer is to wrap the stainless steel wire mesh around the screen pipe at present;anyhow it’s better to be used in conjunction with the reverse circulation drilling method,and the pack material should be selected according to the gradation curve of the aquifer to avoid the transfer of the filtration pressure to the screen pipe,thus reducing well clogging.
作者
王永军
段新胜
刘朝阳
WANG Yongjun;DUAN Xinsheng;LIU Chaoyang(Sinopec Xinxing Hubei New Energy Development Co.,Ltd.,Wuhan Hubei 430040,China;Faculty of Engineering,China University of Geosciences,Wuhan Hubei 430074,China;Wuhan Hydrogeology Engineering Geology Institute,Hubei Geological Bureau,Wuhan Hubei 430000,China)
出处
《探矿工程（岩土钻掘工程）》
2019年第4期37-41,共5页
Exploration Engineering:Rock & Soil Drilling and Tunneling
基金
中石化集团新星石油有限责任公司项目"浅层地热能及地下水源热泵关键技术研究"(编号:10500000-16-ZC0607-0002)
关键词
地下水源热泵
钻井方法
水井堵塞
泵砂
井损
ground source heat pump system
drilling method
well clogging
sand entry
well damage
