超深油藏物质平衡方程修正及应用

doi:10.7623/syxb202211009

石油学报 ›› 2022, Vol. 43 ›› Issue (11): 1623-1631.DOI: 10.7623/syxb202211009

超深油藏物质平衡方程修正及应用

顾浩, 郑松青, 张冬丽, 杨阳

中国石油化工股份有限公司石油勘探开发研究院北京 100083

收稿日期:2021-08-22 修回日期:2022-07-16 出版日期:2022-11-25 发布日期:2022-12-02
通讯作者: 顾浩
作者简介:顾浩,男,1989年1月生,2016年获中国石油大学(北京)博士学位,现为中国石油化工股份有限公司石油勘探开发研究院副研究员,主要从事碳酸盐岩油藏、稠油油藏开发工作。Email:guhao.syky@sinopec.com
基金资助:
国家自然科学基金企业联合基金项目(No.U19B6003)和中国石油化工股份有限公司科技部项目(P19026-3、P20064-3、P21064-2)资助。

Modification and application of material balance equation for ultra-deep reservoirs

Gu Hao, Zheng Songqing, Zhang Dongli, Yang Yang

Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China

Received:2021-08-22 Revised:2022-07-16 Online:2022-11-25 Published:2022-12-02

摘要/Abstract

摘要： 压缩系数是影响油藏物质平衡方程准确性的关键参数,其大小与地层压力密切相关,超深油藏地饱压差、油藏压降较大,但传统超深油藏物质平衡方程忽略压缩系数随地层压力的变化。为完善超深油藏物质平衡方程,考虑岩石孔隙体积压缩系数、地层水压缩系数、地层原油压缩系数、地层原油的两相体积压缩系数以及气体压缩系数随地层压力的变化,修正不同驱动方式(弹性驱、水压驱动、气顶驱、溶解气驱、综合驱动)传统超深油藏物质平衡方程。研究结果表明:传统油藏物质平衡方程未考虑压缩系数随地层压力的变化、未采用微分或积分法求解,不适合超深油藏;传统油藏物质平衡方程均是近似方程。若忽略压缩系数随地层压力的变化且做进一步近似处理,修正后超深油藏物质平衡方程可转化成传统油藏物质平衡方程,证实超深油藏物质平衡方程的修正过程及最终表达式可靠。利用修正后超深油藏物质平衡方程计算得到塔里木盆地超深油藏G-02井动态地质储量为188.65×10⁴t,而传统油藏物质平衡方程计算结果偏大,相对误差为19.19%;随油藏压降增加,修正后超深弹性驱油藏物质平衡方程计算动态地质储量逐渐减小。

关键词: 物质平衡方程, 压缩系数, 超深油藏, 驱动方式, 地层压力

Abstract: Compressibility coefficient is a key parameter that affects the accuracy of material balance equation, and its value is closely related to formation pressure. Ultra-deep reservoirs are characterized with large pressure difference between initial reservoir pressure and saturation pressure, and large reservoir pressure drop, but traditional material balance equations for ultra-deep reservoirs ignore the change of compressibility coefficient with formation pressure. In order to improve material balance equations for ultra-deep reservoirs, the variation of the compressibility coefficient of pore space of rock, water compressibility, oil compressibility, oil-gas two phase volume compressibility and gas compressibility with formation pressure are all considered, respectively, and the traditional material balance equations aimed at different types of drive (elastic drive, hydraulic drive, gas cap drive, dissolved gas drive, combination drive)are modified. It is concluded that the traditional material balance equations fail to consider the change of compressibility coefficient with formation pressure and does not use differential or integral method to solve, which is not suitable for ultra-deep reservoirs. Also, the traditional material balance equations are all approximate equations. If the change of compressibility coefficient with formation pressure is ignored and approximate treatment is further made, the modified material balance equations for ultra-deep reservoir becomes the traditional material balance equations, which proves that the revision process and final expressions of material balance equation for ultra-deep reservoir are reliable. The dynamic geological reserve of Well G-02 in ultra-deep reservoir in Tarim Basin is 188.65×10⁴ t using the modified material balance equation, but the calculated results using the traditional material balance equation is relatively high, and the relative error is 19.19 % . The dynamic geological reserve calculated from the modified elastic drive material balance equation decreases with reservoir pressure drop.

Key words: material balance equation, compressibility coefficient, ultra-deep reservoirs, type of drive, formation pressure

中图分类号:

TE34

顾浩, 郑松青, 张冬丽, 杨阳. 超深油藏物质平衡方程修正及应用[J]. 石油学报, 2022, 43(11): 1623-1631.

Gu Hao, Zheng Songqing, Zhang Dongli, Yang Yang. Modification and application of material balance equation for ultra-deep reservoirs[J]. Acta Petrolei Sinica, 2022, 43(11): 1623-1631.

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超深油藏物质平衡方程修正及应用

Modification and application of material balance equation for ultra-deep reservoirs

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