Wellbore Pressure and Temperature Prediction Model and Its Affecting Factors for CO2 Injection Wells

Dou Liangbin; Li Gensheng; Shen Zhonghou; Wu Chunfang; Bi Gang

doi:10.3969/j.issn.1001-0890.2013.01.015

Volume 41 Issue 1

Jan. 2013

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Petroleum Drilling Techniques > 2013 > 41(1): 76-81. > DOI: 10.3969/j.issn.1001-0890.2013.01.015

Dou Liangbin, Li Gensheng, Shen Zhonghou, Wu Chunfang, Bi Gang. Wellbore Pressure and Temperature Prediction Model and Its Affecting Factors for CO2 Injection Wells[J]. Petroleum Drilling Techniques, 2013, 41(1): 76-81. DOI: 10.3969/j.issn.1001-0890.2013.01.015

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Wellbore Pressure and Temperature Prediction Model and Its Affecting Factors for CO2 Injection Wells

1.
State Key Laboratory of Petroleum Resource and Prospecting(China University of Petroleum(Beijing)), Beijing, 102249, China;
2.
Sinopec Research Institute of Petroleum Engineering, Beijing, 100101, China

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Received Date: July 29, 2012
Revised Date: November 27, 2012

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Abstract

Abstract

In order to improve the displacement efficiency and success rate of CO2 flooding,research has been carried out to predict the pressure and temperature distribution in the wellbore,which affects the displacement efficiency.In view of the special physical properties of CO2,Span-Wagner equation of state,based on the dimensionless Helmholtz energy,has been adopted to establish a model to predict the distribution of temperature and pressure while injecting CO2,calculated by iterative coupling with CO2 physical parameter and pressure as well as heat.The model can predict the bottomhole temperature and pressure accurately.Compared with the well site data of Well Cao 8 in Jiangsu Oilfield,the error of predicted temperature less than 1%,and the maximum error of pressure less than 1.6%,it can meet the requirements of field application.Moreover,the sensitivity analysis can be done through the research of effecting regularity on the bottomhole pressure and temperature produced by injection temperature,injection pressure,injection rate and time,etc.Study shows that model is very accurate,and it can guide CO2 flooding,fit for prediction and analysis of wellbore temperature,pressure and related affecting factors in supercritical CO2 drilling and fracturing.
- CO2 injection,
- state equation,
- well bore flow,
- pressure,
- temperature

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