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A Single Packer Method for Characterizing Water Contributing Fractures in Crystalline Bedrock Wells
Groundwater Monitoring & Remediation ( IF 1.9 ) Pub Date : 2020-01-26 , DOI: 10.1111/gwmr.12365
Neil A. Flahive , Gary A. Robbins

Water levels and water quality of open borehole wells in fractured bedrock are flow‐weighted averages that are a function of the hydraulic heads and transmissivities of water contributing fractures, properties that are rarely known. Without such knowledge using water levels and water quality data from fractured bedrock wells to assess groundwater flow and contaminant conditions can be highly misleading. This study demonstrates a cost‐effective single packer method to determine the hydraulic heads and transmissivities of water contributing fracture zones in crystalline bedrock wells. The method entails inflating a pipe plug to isolate sections of an open borehole at different depths and monitoring changes in the water level with time. At each depth, the change in water level with time was used to determine the sum of fracture transmissivities above the packer and then to solve for individual fracture transmissivity. Steady‐state wellbore heads along with the transmissivities were used to determine individual fracture heads using the weighted average head equation. The method was tested in five wells in crystalline bedrock located at the University of Connecticut in Storrs. The single packer head and transmissivity results were found to agree closely with those determined using conventional logging methods and the dissolved oxygen alteration method. The method appears to be a simple and cost‐effective alternative in obtaining important information on flow conditions in fractured crystalline bedrock wells.

中文翻译:

描述结晶基岩井水赋能裂缝特征的单一封隔器方法

裂隙基岩中裸眼井眼的水位和水质是流量加权平均值,是水力压头和造成裂缝的水的透射率的函数,这是鲜为人知的特性。如果没有此类知识,则使用裂缝性基岩井的水位和水质数据来评估地下水流量和污染物状况可能会产生极大的误导。这项研究证明了一种经济有效的单封隔器方法,可确定结晶基岩井中水力压裂带的水力压头和透过率。该方法需要给管塞充气,以隔离不同深度的裸眼井眼部分,并监测水位随时间的变化。在每个深度 水位随时间的变化用于确定封隔器上方裂缝的透射率之和,然后求解各个裂缝的透射率。使用稳态平均井眼方程和透射率,可以确定单个裂缝的井眼。该方法在位于斯托尔斯的康涅狄格大学的结晶基岩中的五个井中进行了测试。发现单个封隔器头和透射率结果与使用常规测井方法和溶解氧改变方法确定的结果非常吻合。该方法似乎是一种简单且具有成本效益的替代方法,可用于获取有关裂缝性结晶基岩井的流动条件的重要信息。使用稳态平均井眼方程和透射率,可以确定单个裂缝的井眼。该方法在位于斯托尔斯的康涅狄格大学的晶体基岩的五个井中进行了测试。发现单个封隔器头和透射率结果与使用常规测井方法和溶解氧改变方法确定的结果非常吻合。该方法似乎是一种简单且具有成本效益的替代方法,可用于获取有关裂缝性结晶基岩井的流动条件的重要信息。使用稳态平均井眼方程和透射率,可以确定单个裂缝的井眼。该方法在位于斯托尔斯的康涅狄格大学的晶体基岩的五个井中进行了测试。发现单个封隔器头和透射率结果与使用常规测井方法和溶解氧改变方法确定的结果非常吻合。该方法似乎是一种简单且具有成本效益的替代方法,可用于获取有关裂缝性结晶基岩井的流动状况的重要信息。发现单个封隔器头和透射率结果与使用常规测井方法和溶解氧改变方法确定的结果非常吻合。该方法似乎是一种简单且具有成本效益的替代方法,可用于获取有关裂缝性结晶基岩井的流动状况的重要信息。发现单个封隔器头和透射率结果与使用常规测井方法和溶解氧改变方法确定的结果非常吻合。该方法似乎是一种简单且具有成本效益的替代方法,可用于获取有关裂缝性结晶基岩井的流动条件的重要信息。
更新日期:2020-01-26
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