Constant head-transient method using pressure and flow data for determining permeability and specific storage of tight rocks

IF 1.6 Q2 MULTIDISCIPLINARY SCIENCES
MethodsX Pub Date : 2024-08-06 DOI:10.1016/j.mex.2024.102899
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引用次数: 0

Abstract

This paper describes a ‘constant head-transient method’ for estimating permeability and specific storage of tight rock samples, such as shale and crystalline rocks. Experimental tests are conducted using a cylindrical rock sample subjected to confining pressure, through which pressure diffusion occurs from a constant upstream pressure (or constant head) to a finite downstream storage. Unlike the pulse-transient method, the upstream fluid flow into the sample can be measured using a syringe pump because of no change in upstream pressure. By minimizing the downstream storage, the test time can be significantly reduced, but only the downstream pressure transient data do not yield accurate results on permeability and specific storage estimations. By combining the flow data with the pressure data, the proposed method aims at saving the test time and improving the accuracy of their estimations in extremely low permeability rock samples.

  • A constant head-transient method for measuring the hydraulic properties of tight rocks was developed with a boundary condition of constant upstream pressure and finite downstream storage.

  • The test time can be saved by minimizing the downstream storage, and the upstream flow can be measured to improve the accuracy in measuring the hydraulic properties.

  • Combining the flow and pressure objective functions yields the best curve fitting for both pressure and flow curves.

Abstract Image

利用压力和流量数据确定致密岩渗透率和比储量的恒定水头瞬态法
本文介绍了一种 "恒定水头瞬态法",用于估算页岩和结晶岩等致密岩样本的渗透率和比储量。实验测试使用的是承受约束压力的圆柱形岩石样本,通过该样本,压力从恒定的上游压力(或恒定水头)扩散到有限的下游储量。与脉冲瞬态法不同的是,由于上游压力没有变化,因此可以使用注射泵测量进入样本的上游流体流量。通过最大限度地减少下游储量,可以大大缩短测试时间,但仅凭下游压力瞬态数据无法得出准确的渗透率和比储量估算结果。通过将流量数据与压力数据相结合,所提出的方法旨在节省测试时间,并提高极低渗透率岩石样本的估算精度。-在上游压力恒定、下游储量有限的边界条件下,开发了一种测量致密岩石水力特性的恒定水头瞬态方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
MethodsX
MethodsX Health Professions-Medical Laboratory Technology
CiteScore
3.60
自引率
5.30%
发文量
314
审稿时长
7 weeks
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