塔河油田超临界CO_2压裂井筒与裂缝温度场
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摘要
采用超临界CO_2压裂技术能较好地改造塔河油田水敏、低渗储层,而压裂过程中井筒和裂缝温度场对CO_2物性参数影响较大,需要对CO_2压裂温度场进行研究。考虑径向非稳态传热、轴向非稳态对流以及摩擦力、黏滞力的影响,推导了井筒温度、压力方程,结合K-D-R方法和CO_2物性模型,建立了CO_2压裂过程中井筒和裂缝温度场计算模型,并通过实测温度、压力数据拟合,验证了模型的准确性。应用所建模型分析了塔河油田胡杨2井CO_2压裂施工排量对温度场的影响,结果表明:CO_2注入排量对井筒温度、压力以及裂缝温度影响明显,而对裂缝内压力影响较弱;井筒压力梯度随着排量增大而变小;井筒和裂缝中CO_2均可存在液态和超临界态2种相态。研究成果能为塔河油田CO_2压裂施工设计优化提供一定指导。
The use of supercritical CO_2 fracturing technology can better improve the water-sensitive and low-permeability reservoirs in Tahe Oilfield. The wellbore and fracture temperature field in CO_2 fracturing process has a great influence on its physical parameters, and the CO_2 fracturing temperature field is studied. Considering the effects of radial unsteady heat transfer and axial unsteady convection, as well as friction and viscous forces, the wellbore temperature and pressure equations were derived. Combined with K-D-R method and CO_2 physical property model, the calculating model of wellbore and crack temperature field of CO_2 fracturing process was established. The accuracy of the model was verified by the measured temperature and pressure data of a well. The influence of CO_2 fracturing displacement on the temperature field in Huyang 2 Well of Tahe Oilfield was analyzed. The results show that CO_2 injection displacement has obvious influence on wellbore temperature and pressure and crack temperature, but weak influence on crack internal pressure; wellbore pressure gradient becomes smaller as the displacement increases. There are liquid and supercritical states of CO_2 in wellbore and fracture. Certainly, this study can provide some guidance for the design optimization of CO_2 fracturing in Tahe Oilfield.
The use of supercritical CO_2 fracturing technology can better improve the water-sensitive and low-permeability reservoirs in Tahe Oilfield. The wellbore and fracture temperature field in CO_2 fracturing process has a great influence on its physical parameters, and the CO_2 fracturing temperature field is studied. Considering the effects of radial unsteady heat transfer and axial unsteady convection, as well as friction and viscous forces, the wellbore temperature and pressure equations were derived. Combined with K-D-R method and CO_2 physical property model, the calculating model of wellbore and crack temperature field of CO_2 fracturing process was established. The accuracy of the model was verified by the measured temperature and pressure data of a well. The influence of CO_2 fracturing displacement on the temperature field in Huyang 2 Well of Tahe Oilfield was analyzed. The results show that CO_2 injection displacement has obvious influence on wellbore temperature and pressure and crack temperature, but weak influence on crack internal pressure; wellbore pressure gradient becomes smaller as the displacement increases. There are liquid and supercritical states of CO_2 in wellbore and fracture. Certainly, this study can provide some guidance for the design optimization of CO_2 fracturing in Tahe Oilfield.
引文
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[6]窦亮彬,李根生,沈忠厚,等.注CO2井筒温度压力预测模型及影响因素研究[J].石油钻探技术,2013,41(1):76-81.
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[8]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.
[9]陈林,孙雷,彭彩珍,等.注CO2井筒温度场分布规律模拟研究[J].断块油气田,2009,16(6):82-84.
[10]卢智慧,何雪芹,刘志恒,等.考虑环境因素的井筒流动温度场计算[J].断块油气田,2016,23(5):652-654.
[11] LESSER H A,BRUCE G H,STONE H L. Conduction heating of formations with limited permeability by condensing gases[J]. Society of Petroleum Engineers Journal,1966,6(4):372-383.
[12] MEYER B R,HAGEL M W. Simulated mini-frac analysis[J]. Journal of Canadian Petroleum Technology,1988,28(5):63-73.
[13] SETH G,REYNOLDS A C,MAHADEVAN J. Numerical model for interpretation of distributed-temperature-sensor data during hydraulic fracturing[J]. Hydraulic Fracturing Psychology in the Schools,2010,47(2):135-152.
[14] HAI H, MAHADEVAN J, LOPEZ H. Interpretation of wellbore temperatures measured using distributed temperature sensors during hydraulic fracturing[R]. SPE 140442,2011.
[15]孙小辉,孙宝江,王志远.超临界CO2压裂裂缝温度场模型[J].石油学报,2015,36(12):1586-1592.
[16]王瑞和,倪红坚,宋维强,等.超临界二氧化碳钻井基础研究进展[J].石油钻探技术,2018,46(2):1-9.
[17] SPAN D I R. Multiparameter equations of state[J]. Experimental Thermodynamics,2000,5(2):849-881.
[18] ROLAND S,WOLFGANG W. A new equation of state for carbon dioxide covering the fluid region from the triple-point temperature to1 100 K at pressures up to 800 MPa[J]. Journal of Physical and Chemical Reference Data,1996,25(6):1509-1596.
[19] FENGHOUR A,WAKEHAM W A,VESOVIC V. The viscosity of carbon dioxide[J]. Journal of Physical&Chemical Reference Data,1998,27(1):31-44.
[2] MOSS J T,WHITE P D. How to calculate temperature profiles in a water-injection well[J]. Oil&Gas Journal,1959,57(11):174-178.
[3] EICKMEIER J, ERSOY D, RAMEY H. Wellbore temperatures and heat losses during production or injection operations[J]. Journal of Canadian Petroleum Technology,1970,9(2):6.
[4] RAMEY H J J. Wellbore heat transmission[J]. Journal of Petroleum Technology,1962,14(4):427-435.
[5]刘奎,高德利,曾静,等.温度与压力作用下页岩气井环空带压力学分析[J].石油钻探技术,2017,45(3):8-14.
[6]窦亮彬,李根生,沈忠厚,等.注CO2井筒温度压力预测模型及影响因素研究[J].石油钻探技术,2013,41(1):76-81.
[7]赵金洲,彭瑀,李勇明,等.基于双层非稳态导热过程的井筒温度场半解析模型[J].天然气工业,2016,36(1):68-75.
[8]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.
[9]陈林,孙雷,彭彩珍,等.注CO2井筒温度场分布规律模拟研究[J].断块油气田,2009,16(6):82-84.
[10]卢智慧,何雪芹,刘志恒,等.考虑环境因素的井筒流动温度场计算[J].断块油气田,2016,23(5):652-654.
[11] LESSER H A,BRUCE G H,STONE H L. Conduction heating of formations with limited permeability by condensing gases[J]. Society of Petroleum Engineers Journal,1966,6(4):372-383.
[12] MEYER B R,HAGEL M W. Simulated mini-frac analysis[J]. Journal of Canadian Petroleum Technology,1988,28(5):63-73.
[13] SETH G,REYNOLDS A C,MAHADEVAN J. Numerical model for interpretation of distributed-temperature-sensor data during hydraulic fracturing[J]. Hydraulic Fracturing Psychology in the Schools,2010,47(2):135-152.
[14] HAI H, MAHADEVAN J, LOPEZ H. Interpretation of wellbore temperatures measured using distributed temperature sensors during hydraulic fracturing[R]. SPE 140442,2011.
[15]孙小辉,孙宝江,王志远.超临界CO2压裂裂缝温度场模型[J].石油学报,2015,36(12):1586-1592.
[16]王瑞和,倪红坚,宋维强,等.超临界二氧化碳钻井基础研究进展[J].石油钻探技术,2018,46(2):1-9.
[17] SPAN D I R. Multiparameter equations of state[J]. Experimental Thermodynamics,2000,5(2):849-881.
[18] ROLAND S,WOLFGANG W. A new equation of state for carbon dioxide covering the fluid region from the triple-point temperature to1 100 K at pressures up to 800 MPa[J]. Journal of Physical and Chemical Reference Data,1996,25(6):1509-1596.
[19] FENGHOUR A,WAKEHAM W A,VESOVIC V. The viscosity of carbon dioxide[J]. Journal of Physical&Chemical Reference Data,1998,27(1):31-44.