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Well Test Tomography for Rock Hydraulic Characterization

用于岩石水力表征的试井层析成像

基本信息

批准号：
04555148
负责人：
KOJIMA Keiji
金额：
$ 14.08万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

Responding to the demand for quantitative characterization of rock hydraulic properties in large-scale utilization of ground/underground space, we developed a system of hardware/software for multi-well interference testing named 'Hydropulse Tomography (HT)', by which the distribution of rock permeability in 3-D space can be detected using small number of boreholes. HT uses pressure pulses generated by fluid injection/production/shut-in operations at a packered interval of a well, and transient pressure responses caused by the pulses are received at multiple wells and multiple points. For the transient pressure data obtained through this type of operation, fully 3-D numerical inversion analysis is done to determine the spatial heterogeneity of permeability in rock around observation site.We developed a numerical inversion system for transient data, which consists of 3-D one-phase flow simulator, quasi-Newton scheme for non-linear minimization with optimal control algorithm, and schemes for practical well-modeling, time-dependent weighting, arbitrary zoning, and smoothing. The code was validated using 1-D,2-D,and 3-D problems by checking performances of reconstructivity, convergence, and so on. Laboratory experiments for multi-hole HT were done using 1-D and 2-D heterogeneous media, and the obtained data were successfully inverted to the permeability distributions that coincide with the ones set in media. Field testing and 3-D large-scale inversion analysis was done, and the determined permeability distribution was consistent with the geological description, observation of borehole TV and the data of Lugeon test, which were available at the site.

针对大规模利用地面/地下空间对岩石水力特性定量表征的需求，我们开发了多井干扰测试软硬件系统“水脉冲断层扫描（HT）”，通过少量钻孔即可检测岩石渗透率在三维空间的分布。 HT利用井的封隔层段的流体注入/生产/关井操作产生的压力脉冲，并且在多个井和多个点处接收由脉冲引起的瞬态压力响应。对于通过此类操作获得的瞬态压力数据，进行全三维数值反演分析，以确定观测点周围岩石渗透率的空间非均质性。我们开发了瞬态数据数值反演系统，该系统由三维单相流模拟器、采用最优控制算法的非线性最小化拟牛顿方案和实际井建模方案组成，与时间相关的加权、任意分区和平滑。通过检查重构性、收敛性等性能，使用 1-D、2-D 和 3-D 问题对代码进行了验证。使用一维和二维非均质介质进行了多孔HT的实验室实验，所获得的数据成功地反演为与介质中设置的渗透率分布一致的渗透率分布。进行了现场测试和三维大比例反演分析，确定的渗透率分布与现场地质描述、钻孔电视观察和Lugeon测试数据一致。