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Underpressured and Overpressured Tight Gas Sands: Ⅱ. Spatially and Temporally Varying Conditions

机译:低压和超压致密气砂:Ⅱ。时空变化条件

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摘要

This paper investigates the behavior of gas in tight sand aquifers when the shape of the aquifer, its cross-section, permeability, and temperature can all vary along the length of the aquifer. The basic response equation is steady state input of gas under pressure at the lower end of the aquifer and uses Darcy's law for fluid motion in association with buoyancy drive on the gas to determine the gas pressure variations along the aquifer as the lower end aquifer conditions are changed. Both overpressured and underpressured situations can arise, and are sensitive to the variation of parameters describing both the geometry and the physical conditions in the aquifer. Several illustrations are given to show how simple changes can cause different pressure conditions along the aquifer, making it difficult ahead of drilling to know which conditions prevail in a given tight gas sand aquifer.
机译:当含水层的形状,横截面,渗透率和温度都沿含水层的长度方向变化时,本文研究了紧砂含水层中的气体行为。基本响应方程是在含水层下端处于压力下的气体的稳态输入,并使用达西定律进行流体运动并结合气体的浮力驱动来确定沿含水层的压力变化,因为下端含水层的条件是改变了。可能出现过压和欠压情况,并且对描述含水层几何形状和物理条件的参数变化敏感。给出了几个插图,以说明简单的变化如何导致沿含水层的不同压力条件,从而在钻探之前很难知道给定的气砂含水层中存在哪些条件。

著录项

  • 来源
    《Energy Exploration & Exploitation》 |2005年第3期|p.169-180|共12页
  • 作者

    Ian Lerche;

  • 作者单位

    Institut fuer Geophysik und Geologie, Universitaet Leipzig, 04103 Leipzig, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 能源与动力工程;
  • 关键词

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