超临界二氧化碳喷射压裂井筒流体相态控制

doi:10.7623/syxb201406016

石油学报 ›› 2014, Vol. 35 ›› Issue (6): 1182-1187.DOI: 10.7623/syxb201406016

超临界二氧化碳喷射压裂井筒流体相态控制

程宇雄, 李根生, 王海柱, 沈忠厚, 蔡承政

中国石油大学油气资源与探测国家重点实验室北京 102249

收稿日期:2014-06-13 修回日期:2014-09-29 出版日期:2014-11-25 发布日期:2014-10-13
通讯作者: 李根生,男,1961年9月生,1983年毕业于华东石油学院钻井工程专业,1988年获石油大学(北京)油气井工程专业博士学位,现为中国石油大学(北京)教授、博士生导师,主要从事油气钻井和完井工程方面的研究。Email:ligs@cup.edu.cn
作者简介:程宇雄,男,1987年6月生,2010年毕业于中国石油大学(华东)石油工程专业,现为中国石油大学(北京)博士研究生,主要从事油气钻井与压裂增产方面的研究。Email:chengyuxiong@126.com
基金资助:
国家自然科学基金创新研究群体项目(No.51221003)和国家自然科学基金重大国际(地区)合作项目(No.51210006)资助。

Phase control of wellbore fluid during supercritical CO₂ jet fracturing

Cheng Yuxiong, Li Gensheng, Wang Haizhu, Shen Zhonghou, Cai Chengzheng

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China, 102249

Received:2014-06-13 Revised:2014-09-29 Online:2014-11-25 Published:2014-10-13

摘要/Abstract

摘要：

为了探索超临界CO₂喷射压裂的井筒流体相态控制方法,建立了超临界CO₂喷射压裂井筒流动模型,进行了实例计算和分析,并以异常低地温梯度的地层为例研究井筒流体的相态控制问题。结果表明:超临界CO₂喷射压裂过程中,随着井深增加,井筒压力逐渐增高,井筒温度先增高后在接近压裂层位处开始降低;井筒压力很容易达到CO₂流体的临界压力,井筒温度的控制是超临界CO₂喷射压裂相态控制的关键;如果地温梯度过低,压裂层位井筒中的CO₂流体将达不到临界温度,影响超临界CO₂喷射压裂作业的正常进行,此时提高注入CO₂流体的温度,可有效促进压裂层位的CO₂成为超临界态。该研究可为超临界CO₂喷射压裂技术的流体相态控制提供一定的借鉴。

关键词: 超临界流体, CO₂, 喷射压裂, 井筒, 相态控制, 传热

Abstract:

This study investigated the method for phase control of wellbore fluid during supercritical CO₂ jet fracturing. A wellbore flow model of supercritical CO₂ jet fracturing was built and then used for example calculation and analysis. Moreover, the phase control issue was investigated in an example formation at a subnormal geothermal gradient. During supercritical CO₂ jet fracturing, wellbore pressure increases with increasing well depth, while wellbore temperature first increases and then decreases near the target zone. Wellbore pressure easily reaches the critical pressure, and the control of wellbore temperature appears to be the key factor for phase control of supercritical CO₂ jet fracturing. When the geothermal gradient is significantly low, CO₂ fluid in the wellbore of the target zone can not reach the critical temperature, thus affecting the process of supercritical CO₂ jet fracturing. In this case, increasing the temperature of CO₂ fluid injected into the wellbore will effectively promote CO₂ fluid to enter the supercritical state. This study provides a reference for phase control of wellbore fluid during supercritical CO₂ jet fracturing.

Key words: supercritical fluid, carbon dioxide, jet fracturing, wellbore, phase control, heat transfer

中图分类号:

TE377

程宇雄, 李根生, 王海柱, 沈忠厚, 蔡承政. 超临界二氧化碳喷射压裂井筒流体相态控制[J]. 石油学报, 2014, 35(6): 1182-1187.

Cheng Yuxiong, Li Gensheng, Wang Haizhu, Shen Zhonghou, Cai Chengzheng. Phase control of wellbore fluid during supercritical CO₂ jet fracturing[J]. ACTA PETROLEI SINICA, 2014, 35(6): 1182-1187.

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超临界二氧化碳喷射压裂井筒流体相态控制

Phase control of wellbore fluid during supercritical CO₂ jet fracturing

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超临界二氧化碳喷射压裂井筒流体相态控制

Phase control of wellbore fluid during supercritical CO2 jet fracturing

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Phase control of wellbore fluid during supercritical CO₂ jet fracturing