新疆石油地质

新疆石油地质 ›› 2010, Vol. 31 ›› Issue (6): 617-620.

• 油藏工程 • 上一篇    下一篇

考虑相态变化的CO2气藏物质平衡方程

吕渐江1, 唐海1, 李春芹2, 海涛3, 杜春晖3, 吕栋梁1   

  1. 1.西南石油大学 成都 610500;
    2.中国石化 胜利油田有限责任公司 纯梁采油厂,山东 东营 256504;
    3.中国石化 西北油田分公司 塔河采油二厂,新疆 轮台 841604
  • 收稿日期:2010-03-29 修回日期:2010-06-01 发布日期:2021-01-18
  • 作者简介:吕渐江(1983-),男,山东青岛人,在读博士研究生,油气田开发,(Tel)13518129851(E-mail)datalwdrill@yahoo.com.cn.

Material Balance Equation for CO2 Gas Reservoir Considering Phase State Changes

LV Jian-jiang1, TANG Hai1, LI Chun-qin2, HAI Tao3, DU Chun-hui3, LV Dong-liang1   

  1. 1. Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Chunliang Oil Production Plant, Shengli Oilfield Company Ltd., Sinopec, Dongying, Shandong 256504, China;
    3. Tahe No.2 Production Plant, Northwest Oilfield Company, Sinopec, Luntai, Xinjiang 841604, China
  • Received:2010-03-29 Revised:2010-06-01 Published:2021-01-18

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摘要： 在CO2气藏束缚水、入侵水、产出水中都溶解有CO2,以摩尔守恒为理论基础,建立了CO2气藏的物质平衡方程。CO2的相态及物性变化与气藏压力、温度条件密切相关,同时考虑地层水矿化度对CO2溶解度的影响,利用牛顿均差插值方法编程计算气藏任意条件下的物性参数。利用物质平衡方程结合CO2 的高压物性随压力、温度的变化关系,可以计算CO2气藏的地质储量和不同采出程度下的平均地层压力,并确定开发过程中的CO2相态变化。实例验证计算误差为0.131%,说明计算方法切实可行。

关键词: CO2气藏, 物质平衡, 地质储量, 地层压力, 相态

Abstract: CO2 can be dissolved in irreducible water, intrusion water and produced water in CO2 gas reservoirs. This paper presents the material balance equation for CO2 gas reservoir based on mole conservation theory. The physical property and phase change of CO2 are closely related to the pressure and temperature conditions, and the solubility of CO2 is affected by the formation water salinity. Using Newton interpolation polynomial, the parameters of physical properties under different reservoir conditions can be calculated, and based on the material balance equation, integrated with high pressure property of CO2 and its changes with pressure and temperature, the CO2 inplace or geological reserves and the average reservoir pressure in different recovery factors can also be estimated, and the phase state changes of CO2 in the development process can be determined. The relative error of the recalculated geological reserves is 0.131%, showing this method is effective.

Key words: CO2 gas reservoir, material balance, geological reserves, formation pressure, phase state

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