Improvements in Hydrofracturing Procedure and InterpretationThrough Laboratory Tests

通过实验室测试改进水力压裂程序和解释

• 批准号: 8708164
• 负责人: Bezalel Haimson
• 金额: $ 1.76万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1988-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8708164&HistoricalAwards=false
• 关键词: Improvements; Hydrofracturing; Procedure; InterpretationThrough; Laboratory

The hydrofracturing method of in situ stress measurement has evolved in the last fifteen eyars into an indispensable tool in geophysical research. For example, a major objective of the first deep scientific drilling in the U.S. at Cajon Pass, California, is to measure the state of stress, primarily by hydrofracturing, in the vicinity of the San Andreas fault. Depsite the general reliability of hydrofracturing, uncertainties in its interpretation still exist and cases where the method is only partially successful or totally unsuccessful are now surfacing. There are at least three major sources of diffi- culties in hydrofracturing data interpretaion: (1) reading the correct pessures from field records, (2) using the correct model for calculating the in situ stresses and (3) evaluating the effect of preexisting fractures on hydrofrac pressures and directions. The research is an attempt to resolve some of these difficulties through laboratory testing and data analysis. In addition, experimental verification of suggested innovative improvements of the method will be carried out. Such confir- mation of one or more of these alternate techniques would enable their use in either complementing orreplacing conventional hydrofracturing.

水压致裂法地应力测量在过去的十五年里已经发展成为地球物理研究中不可缺少的工具。例如，美国在加利福尼亚州卡洪山口进行的第一次深科学钻探的一个主要目标是测量圣安德烈亚斯断层附近的应力状态，主要是通过水力压裂。关于水力压裂的总体可靠性，其解释中的不确定性仍然存在，这种方法只有部分成功或完全不成功的情况现在正在浮出水面。水力压裂资料解释的困难至少有三个主要来源：(1)从现场记录中读取正确的假设；(2)使用正确的地应力计算模型；(3)评价预先存在的裂缝对水力压裂压力和方向的影响。这项研究是通过实验室测试和数据分析来解决其中一些困难的尝试。此外，还将对该方法提出的创新性改进进行实验验证。这些替代技术中的一项或多项的这种组合将使它们能够用于补充或取代传统的水力压裂。