考虑修正BET吸附的异常高压页岩气藏物质平衡计算方法

doi:10.3969/j.issn.1006-6535.2022.02.011

特种油气藏 ›› 2022, Vol. 29 ›› Issue (2): 77-82.DOI: 10.3969/j.issn.1006-6535.2022.02.011

考虑修正BET吸附的异常高压页岩气藏物质平衡计算方法

张城玮^1,2, 程时清^1,2, 周文^3,5, 张腾⁴, 蒋柯^3,5, 祝朗^1,2, 徐浩^3,5

1.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;
2.中国石油大学(北京),北京 102249;
3.成都理工大学,四川成都 610059;
4.中国石油川庆钻探工程有限公司,四川成都 610051;
5.油气藏地质及开发工程国家重点实验室(成都理工大学),四川成都 610059

收稿日期:2021-04-12 修回日期:2021-12-29 出版日期:2022-04-25 发布日期:2023-01-10
通讯作者: 程时清(1963—),男,研究员,博士生导师,1984年毕业于大庆石油学院油气田开发专业,2000年毕业于中科院渗流力学所流体力学专业,获博士学位,现从事油气藏动态监测、油气藏工程、非常规油气田开发、油藏工程软件研制等方面的研究工作。
作者简介:张城玮(1994—),男,2015年毕业于成都理工大学石油工程专业,现为中国石油大学(北京)油气田开发工程专业在读博士研究生,主要从事油气藏数值模拟及油气藏工程方面的研究。
基金资助:
国家科技重大专项“海相页岩气储层评价方法研究”(2016ZX05034002-006);国家自然科学基金“海相高成熟页岩气储层微观气-水分布规律研究”(42002157)

A Calculation Method for Material Balance of Shale Gas Reservoirs under Abnormally High Pressure Considering Modified BET Adsorption

Zhang Chengwei^1,2, Cheng Shiqing^1,2, Zhou Wen^3,5, Zhang Teng⁴, Jiang Ke^3,5, Zhu Lang^1,2, Xu Hao^3,5

1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;
2. China University of Petroleum (Beijing), Beijing 102249, China;
3. Chengdu University of Technology, Chengdu, Sichuan 610059, China;
4. CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, Sichuan 610051, China;
5. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology),Chengdu,Sichuan 610059, China

Received:2021-04-12 Revised:2021-12-29 Online:2022-04-25 Published:2023-01-10

摘要/Abstract

摘要： 页岩气物质平衡方程中,通常采用langmuir等温吸附方程表征吸附气量,但langmuir等温吸附方程的使用条件并不适合异常高压页岩气藏。鉴于此,针对异常高压页岩气藏的单井控制储量计算的问题,基于物质平衡方程的基本原理,考虑页岩气的多层吸附、超临界吸附、异常高压三重影响,引入修正BET吸附模型,表征页岩气的吸附特性,建立考虑修正BET吸附因素的异常高压页岩气藏物质平衡方程。将研究成果应用于实际区块单井分析中,应用实例表明:文中建立模型的直线相关系数更高,不仅能计算气井的控制储量,也能计算泄气范围内的自由气含量以及吸附气含量。根据该方程计算的结果与实际储层的地质条件结合,文中模型所考虑的建立条件与实际储层的情况更为接近,研究成果对异常高压页岩气藏的生产管理具有重要的指导意义。

关键词: 异常高压页岩气藏, 物质平衡计算方法, 改进BET吸附, 多层吸附, 超临界吸附, 动态预测

Abstract: Langmuir isothermal adsorption equation is usually used to characterize the amount of adsorbed gas in the material balance equation of shale gas, while the application conditions of Langmuir isothermal adsorption equation are not suitable for shale gas reservoirs under abnormally high pressure. To address the problems about the calculation of single-well recoverable reserves in shale gas reservoirs under abnormally high pressure, based on the basic principle of the material balance equation, a modified BET adsorption model was introduced to characterize the adsorption characteristics of shale gas with consideration of the triple effects (multilayer adsorption, supercritical adsorption and abnormally high pressure) of shale gas, and a material balance equation was established for shale gas reservoirs under abnormally high pressure considering the modified BET adsorption factor. The application of the study results to the analysis of single wells in actual blocks proved that the linear correlation coefficient of the model established in this paper was higher, and the model can not only calculate the controlled reserves of gas wells, but also calculate the free gas content and adsorbed gas content in the gas release range. According to the calculation results of this equation and the geological conditions of the actual reservoir, the construction conditions considered by the model in this paper are closer to the actual reservoir conditions. The study results play an important guiding role in the production management of shale gas reservoirs under abnormally high pressure.

Key words: shale gas reservoirs under abnormally high pressure, material balance calculation method, modified BET adsorption, multilayer adsorption, supercritical adsorption, dynamic forecast

中图分类号:

TE349

张城玮, 程时清, 周文, 张腾, 蒋柯, 祝朗, 徐浩. 考虑修正BET吸附的异常高压页岩气藏物质平衡计算方法[J]. 特种油气藏, 2022, 29(2): 77-82.

Zhang Chengwei, Cheng Shiqing, Zhou Wen, Zhang Teng, Jiang Ke, Zhu Lang, Xu Hao. A Calculation Method for Material Balance of Shale Gas Reservoirs under Abnormally High Pressure Considering Modified BET Adsorption[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 77-82.

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考虑修正BET吸附的异常高压页岩气藏物质平衡计算方法

A Calculation Method for Material Balance of Shale Gas Reservoirs under Abnormally High Pressure Considering Modified BET Adsorption

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