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注CO_2井筒温度压力预测模型及影响因素研究

ISSN号：1001-0890
期刊名称：《石油钻探技术》
时间：0
分类：TE28[石油与天然气工程—油气井工程]
作者机构：[1]油气资源与探测国家重点实验室(中国石油大学(北京)),北京102249, [2]中国石化石油工程技术研究院,北京100101
相关基金：基金项目：国家自然科学基金项目“超临界二氧化碳在非常规油气藏中应用的基础研究”（编号：51034007）;国家重点基础研究发展计划（“973”计划）项目“深井复杂地层安全高效钻井基础研究”（编号：2010CB226700）部分研究内容.

作者：窦亮彬[1], 李根生[1], 沈忠厚[1], 吴春方[2], 毕刚[1]

关键词：注二氧化碳, 状态方程, 井筒流动, 压力, 温度, CO2 injection, state equation, well factors in supercritical CO2 drilling and fracturing. bore flow, pressure, temperature

中文摘要：

为了提高注CO2驱替效率及驱替成功率，开展了影响驱替效率的井筒压力温度分布及影响因素研究。针对CO2特殊的物理性质，选用基于赫姆霍兹自由能的Span-Wagner状态方程，将井筒传热、压力与CO2物性参数耦合迭代计算，建立了注CO2井筒温度压力分布的数学预测模型。该模型能够预测井筒温度压力及其他物性参数，应用该模型预测井筒各点温度压力，并与江苏草舍油田草8井现场2次实测结果对比，其温度误差均小于1％，压力最大误差不超过1．6％，表明该模型能够满足现场应用要求。利用该模型可以研究注入温度、注入压力、注入速度及注入时间等工艺参数对井底压力温度的影响规律，实现系统敏感性分析。研究表明，建立的模型具有很高的精度，对提高CO2驱替效率具有指导作用，并适用于（超临界）CO2钻井、压裂过程中井筒温度压力预测及影响因素分析。

英文摘要：

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 dis placement 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 applica tion. Moreover, the sensitivity analysis can be done through the research of effecting regularity on the bot- tomhole 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 .

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