石油与天然气地质 ›› 1998, Vol. 19 ›› Issue (4): 280-284.doi: 10.11743/ogg19980403

• 论文 • 上一篇    下一篇

岩石压缩系数测量方法的理论研究

李传亮   

  1. 中国科学技术大学力学系, 安徽合肥230027
  • 收稿日期:1998-07-09 出版日期:1998-12-25 发布日期:2012-01-18

A THEORETICAL STUDY ON MEASUREMENT OF ROCK COMPACTING FACTORS

Li Chuanliang   

  1. Department of Moderm Mechanics, China Science and Technology University, Hefei, Anhui
  • Received:1998-07-09 Online:1998-12-25 Published:2012-01-18

PDF (PC)

1030

被引次数

6

摘要：

岩石压缩系数的常规测量方法是以Terzaghi方程为理论基础的。该理论将外压与内压的差值作为净围压是不妥当的,主要原因是没有考虑孔隙度的影响。正确的公式应是Po=Peff+ΦPi.有效压力是一个等效压力,变换围压或内压都能达到理想效果。据此,可将原有测量程序改进为:(1)保持内压Pi=Pair;(2)令Po=Pair,测量初始孔隙体积Vpo;(3)逐步升高Po,测一系列Vp;(4)将Po和Pi用改进后的公式换算成Peff,将得到Vp-Peff关系曲线,进一步可求出岩石压缩系数。经实际应用,改进后的方法有如下优点:(1)更正了原有效压力计算的错误;(2)避免了因围压过高带来的危险;(3)消除了因内压变化对体积系数的影响。

关键词: 压缩系数, 测量方法, 多孔介质, 净围压, 等效压力

Abstract:

The measurement of rock compacting is theoretically based on Terzaghi Equation,which takes incorrectly the difference of Po and Pi as net confining pressure.A new equation Po = Peff + ΦPi is proposed in this paper to calculate the net confing pressure correctly,and an improving measurement procedure is presented.The compacting factors obtained in lab must be converted into the value which is applicable to reservoir engineering when practical calculatoins are being operated.The conversion formula is established in this paper.