Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (2): 1-5.doi: 10.3969/j.issn.1673-8926.2015.02.001

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Compressibility coefficients of bulk volume and fluid-solid of rocks

LI Chuanliang,ZHU Suyang   

  1.  School of Petroleum Engineering ， Southwest Petroleum University ， Chengdu 610599 ， China
  • Online:2015-03-03 Published:2015-03-03

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Abstract:

Rocks have three volumes and three stresses, so have several compressibility coefficients. Pore compressibility and its applications have been mainly studied in reservoir engineering, and others are seldom touched. This paper focused on the compressibilities of bulk volume and fluid-solid of rocks, and derived their calculation formula. The compressibility of bulk volume of rocks to pore pressure is the same of pore compressibility of rocks. The compressibility of bulk volume of rocks to outer pressure is the function of porosity and skeleton compressibility of rocks. The two-phase compressibility of fluid-solid of rocks is porosity-weighted harmonic mean of fluid compressibility and skeleton compressibility, or porosity-weighted arithmetic mean of reciprocals of fluid compressibility and skeleton compressibility.

Key words: coal bed methane, well interference characteristics, mathematical model of pressure distribution, well pattern arrangement, production suggestions

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