A coupling model for wellbore transient temperature and pressure of fracturing with supercritical carbon dioxide

doi:10.7623/syxb201502009

Acta Petrolei Sinica ›› 2015, Vol. 36 ›› Issue (2): 203-209.DOI: 10.7623/syxb201502009

• Oil Field Development • Previous Articles Next Articles

A coupling model for wellbore transient temperature and pressure of fracturing with supercritical carbon dioxide

Guo Jianchun¹, Zeng Ji²

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. Gas Production Engineering Research Institute, PetroChina Southwest Oil and Gas Field Company, Sichuan Guanghan 618300, China

Received:2014-07-13 Revised:2014-10-21 Online:2015-02-25 Published:2015-02-05

超临界二氧化碳压裂井筒非稳态温度-压力耦合模型

郭建春¹, 曾冀²

1. 西南石油大学油气藏地质及开发工程国家重点实验室四川成都 610500;
2. 中国石油西南油气田公司采气工程研究院四川广汉 618300

通讯作者: 曾冀,男,1988年5月生,2011年获西南石油大学学士学位,2014年获西南石油大学硕士学位,现为中国石油西南油气田公司采气工程研究院助理工程师,主要从事油气藏增产改造方面的研究。Email:zengjideha@126.com
作者简介:郭建春,男,1970年9月生,1992年获西南石油学院学士学位,1998年获西南石油学院博士学位,现为西南石油大学石油与天然气工程学院院长、教授、博士生导师,主要从事油气藏开采和增产技术方面的研究和教学。Email:guojianchun@vip.163.com
基金资助:
国家自然科学基金项目(No.51374178)和四川省青年科技创新研究团队资助计划项目(2011JTD0018)资助。

Abstract

Abstract:

Wellbore temperature and pressure have a great impact on the physical parameters of carbon dioxide, and these three factors interact with each other, which requires coupled solution. Based on continuity equation, motion equation, law of conservation of energy and heat transfer theory, a coupling model for wellbore transient temperature and pressure of fracturing with supercritical carbon dioxide was built. The model was secreted by staggered-grid fully implicit format; the REFPROP software was used to compute the physical parameters of carbon dioxide; and the coupled solution was made using loop iteration algorithm. The computation result shows that the down-hole carbon dioxide can reach supercritical state under the present operation condition; the injected temperature exerts a significant influence on wellbore temperature, and weak influence on the wellbore pressure; the injected pressure and tubing roughness have great effect on wellbore pressure, and weak effect on wellbore temperature. The injection rate has impacts on both wellbore temperature and pressure obviously. The high friction and low viscosity of carbon dioxide limit the increase in injection rate and sand ratio respectively, and thus studies on fluid friction reduction and fluid thickening should be further enhanced.

Key words: supercritical carbon dioxide, fracturing, transient, wellbore, temperature, pressure, coupling

摘要：

井筒内温度、压力对二氧化碳物性参数影响较大,且三者之间相互影响,需进行耦合求解。基于连续性方程、运动方程、能量守恒定律和传热学理论,建立了超临界二氧化碳压裂井筒非稳态温度-压力耦合模型。采用交错网格全隐式离散模型,并调用Refprop软件计算二氧化碳物性参数,采用循环迭代求解。计算结果表明:在目前施工条件下井底二氧化碳能达到超临界状态;井口二氧化碳注入温度对井筒温度影响明显,而对井筒压力影响较弱;二氧化碳注入压力和油管粗糙度对井筒压力影响较大,而对井筒温度影响较弱;二氧化碳注入排量对井筒温度、压力均有明显影响。二氧化碳的高摩阻和低黏度分别限制了施工排量和砂比的提升,因此需进一步加强流体减阻和增稠方面的研究。

关键词: 超临界二氧化碳, 压裂, 非稳态, 井筒, 温度, 压力, 耦合

CLC Number:

TE357.2

Guo Jianchun, Zeng Ji. A coupling model for wellbore transient temperature and pressure of fracturing with supercritical carbon dioxide[J]. Acta Petrolei Sinica, 2015, 36(2): 203-209.

郭建春, 曾冀. 超临界二氧化碳压裂井筒非稳态温度-压力耦合模型[J]. 石油学报, 2015, 36(2): 203-209.

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A coupling model for wellbore transient temperature and pressure of fracturing with supercritical carbon dioxide

超临界二氧化碳压裂井筒非稳态温度-压力耦合模型

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