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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.

针对大规模开发利用地下空间对岩石水力特性定量表征的需求，研制了一套多井干涉测试系统“水力脉冲层析成像”（Hydropulse Tomography，简称HT层析成像）。HT使用在井的封隔间隔处由流体注入/生产/关井操作产生的压力脉冲，并且在多个威尔斯和多个点处接收由脉冲引起的瞬态压力响应。针对该方法获得的不稳定压力数据，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匀性，开发了一套不稳定压力数据数值反演系统，该系统由三维单相流模拟器、非线性最小化的拟牛顿最优控制算法和实际井模拟方案组成，时间相关加权、任意分区和平滑。通过对一维和二维三维问题的重构性、收敛性等性能的检验，对程序进行了验证，并对一维和二维非均质介质进行了多孔HT实验，成功地反演出与介质中渗透率分布相吻合的渗透率分布。通过现场测试和三维大比例尺反演分析，确定的渗透率分布与现场地质描述、钻孔TV观测和吕荣试验资料相吻合。