CROSS-HOLE PERIODIC HYDRAULIC TESTING OF INTER-WELL CONNECTIVITY

CROSS-HOLE PERIODIC HYDRAULIC TESTING OF INTER-WELL CONNECTIVITY
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井间连通性的跨孔定期液压测试

DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
E. Guiltinan
E. Guiltinan
中科院分区：
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文献类型：
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作者：
M. Becker;E. Guiltinan

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谐波（周期性）水力试验可以确定地热井活跃生产过程中的地层水力特性。在裂缝性砂岩中进行了现场实验，以确定这些测试对建立井间连通性的价值。在井内诱发了正弦头振荡，并在4口观测井中测量了压力脉冲通过单个裂缝的传播情况。压力响应通过水力扩散方程的非线性回归拟合来解释。与传统的恒速率（Theis）试验相比，从这些试验中得到的水力扩散系数（透射率/储存性）对局部异质性更为敏感。该方法对于预测裂缝性地热储层的水力短路尤其有用。
Harmonic (periodic) hydraulic tests can establish formation hydraulic properties during active production of geothermal wells. Field experiments were conducted in a fractured sandstone to establish the value of these tests for establishing inter-well connectivity. Sinusoidal head oscillation was induced in well and the propagation of the pressure pulse through a single fracture was measured in four observation wells. Pressure response was interpreted by non-linear regression fitting of the hydraulic diffusion equation to drawdown. Hydraulic diffusivity (transmissivity / storativity) inverted from these tests were found to be much more sensitive to local heterogeneity than traditional constant rate (Theis) tests. The method may be particularly useful for anticipating hydraulic short circuiting in fractured geothermal reservoirs.