Periodic pumping tests
Periodic pumping tests
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DOI：
10.1111/j.1365-246x.2006.02984.x
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发表时间：
2006-10-01
影响因子：
2.8
通讯作者：
Messar, Mareike
中科院分区：
文献类型：
--
作者：
Renner, Joerg;Messar, Mareike
我们进行了抽水试验，定期连续的注入和生产间隔在一个领域的三个浅钻孔穿透节理砂岩地层。试验周期为10 ~ 5400 s，泵送速率为5 ~ 20 l/min（-1）。提出了两种周期抽水试验的分析方法。注入性分析依赖于确定来自抽油井的周期性流量和压力记录之间的振幅比和相移。干扰分析是基于对泵送井和监测威尔斯井处的周期性压力信号之间的衰减和相移的评估。周期性激励允许采用标准的信号处理工具，如快速傅立叶变换，便于弱信号的评估。观察到的振幅比和相移值进行比较，1-D和径向流模型的分析预测。干扰试验的结果对于地下模型的适用性特别具有诊断意义。我们的测试结果不完全同意任何考虑的分析模型，表明一个异质的地下。我们假设，这两种分析方法产生的平均水力特性的不同体积的非均质地下。如果系统地增加泵送周期，则定期注入性测试筛选地下以增加穿透深度，而泵送井和监测井之间的地下体积在所有周期都主导干扰测试的结果。与常规测试（如压降测试、脉冲测试或关井测试）相比，定期泵送具有几个操作优势。定期测试可以叠加在长期操作上，减少操作冲突，并允许连续监测地下特性的变化。周期信号的处理甚至在具有与例如附近威尔斯中的操作相关的流体压力的强瞬态变化的油田中提供结果。可以在闭环中执行周期性泵送，从而使所涉及的总流体体积最小化。
We performed pumping tests with a periodic succession of injection and production intervals in a field of three shallow boreholes penetrating a jointed sandstone formation. Tests were conducted at periods ranging from 10 to 5400 s and pumping rates between 5 and 20 l min(-1). Two types of analysis for the periodic pumping tests are presented. Injectivity analysis rests on the determination of the amplitude ratio and phase shift between the periodic flow rate and pressure records from the pumping well. Interference analysis is based on an evaluation of attenuation and phase shift between the periodic pressure signals at the pumping and monitoring wells. A periodic excitation permits to employ standard signal processing tools, such as fast Fourier transformation, facilitating the evaluation of weak signals. The observed amplitude ratio and phase shift values are compared to analytical predictions of 1-D and radial flow models. Results of interference tests are particularly diagnostic for the applicability of a subsurface model. Our test results do not fully agree with any of the considered analytical models suggesting a heterogeneous subsurface. We suppose that the two analysis methods yield averaged hydraulic properties of different volumes of a heterogeneous subsurface. Periodic injectivity tests screen the subsurface to increasing penetration depth if pumping period is systematically increased, while the subsurface volume between pumping and monitoring well dominates the outcome of an interference test at all periods. Periodic pumping provides several operational advantages compared to conventional testing, such as drawdown, pulse or shut-in tests. Periodic testing can be superposed on a long-term operation reducing operational conflicts and permitting continuous monitoring of changes in subsurface properties. Processing of periodic signals provides results even in a field with strong transient changes in fluid pressure related, for example, to operations in nearby wells. Periodic pumping can be performed in a closed loop minimizing the total fluid volume involved.