井下节流气井生产分析方法研究

发布时间：2018-04-03 04:30

本文选题：生产动态分析　切入点：井下节流　出处：《西南石油大学》2015年硕士论文

【摘要】：井下节流工艺能够降压安全生产和降低气田开发成本,但是井下节流后井口油压与井底流压的自然联系被阻断,实测流压又十分困难,在这种条件下如何利用井口资料进行动态分析十分必要。利用日常记录的井口资料进行分析,需要以单井开采系统为研究对象,根据天然气在地层、井筒中的流动特性,根据流量、压力的变化,分析生产系统在不同时期、不同条件下的协调工作状态,评价气井的控制储量、合理产能,同时分析井下节流工具在下深处的工作状态,是否满足最佳工艺要求。本文针对井下节流采气工艺的高压气井,采用井筒-气藏流动耦合方式进行生产动态分析。为此,本文完成的主要工作如下： 1、考虑节流温降效应,建立了井筒温度场模型,预测井筒非线性温度场及相关热力学参数；综合井下节流、地层传热效应,建立了井筒流动模型。 2、针对压裂井、水平井建立了渗流数学模型,作为气井流入动态预测。 3、通过气藏单井数值模拟对比,分析传统拟压力法的适用条件,提出了基于物质平衡约束,考虑地层压力下降的流体性影响及非线性渗流近似计算方法,改进了气藏动态分析的理论模型,提高了井底压和平均地层压力的预测精度。 4、将井筒流动与气层渗流作为一个整体,考虑节流条件下井筒流动的压力间断、温度突变的特殊性,建立气井动态分析模型。基于以上的研究成果,本文最后对X气藏的井下节流气井,进行了生产动态分析,形成生产指数诊断曲线,通过套压与理论曲线的拟合,解释地层参数,获得压力剖面、温度剖面、速度剖面。
[Abstract]:The downhole throttling process can reduce the production pressure and the development cost of the gas field, but the natural connection between the wellhead oil pressure and the bottom hole flow pressure is blocked after downhole throttling, and the measured flow pressure is very difficult.Under this condition, it is necessary to make use of wellhead data for dynamic analysis.Using the daily recorded wellhead data for analysis, it is necessary to analyze the production system in different periods according to the flow characteristics of natural gas in formation and wellbore, according to the change of flow rate and pressure, taking the single well production system as the research object.At the same time, the working condition of the downhole throttling tool in the bottom of the well is analyzed, and whether it meets the best technological requirements is also analyzed in this paper, including the coordinated working state under different conditions, the evaluation of the controlled reserves of the gas well, and the reasonable productivity.In this paper, the production performance of high pressure gas wells with downhole throttling gas recovery technology is analyzed by wellbore gas reservoir flow coupling method.Therefore, the main work accomplished in this paper is as follows:1. Considering the effect of throttling temperature drop, the model of wellbore temperature field is established to predict the nonlinear temperature field of wellbore and related thermodynamic parameters, and the wellbore flow model is established by synthesizing downhole throttling and formation heat transfer effect.2. For fracturing wells and horizontal wells, a mathematical model of percolation is established to predict the inflow performance of gas wells.3. Through numerical simulation and comparison of single well in gas reservoir, the suitable conditions of traditional pseudo pressure method are analyzed. Based on the material balance constraint, the fluid effect of formation pressure drop and the approximate calculation method of nonlinear percolation are put forward.The theoretical model of gas reservoir performance analysis is improved and the prediction accuracy of bottom hole pressure and average formation pressure is improved.4. Taking wellbore flow and gas reservoir seepage as a whole, considering the pressure discontinuity of wellbore flow under throttling condition and the particularity of temperature abrupt change, the dynamic analysis model of gas well is established.Based on the above research results, in the end of this paper, the production performance analysis is carried out for the downhole throttling gas wells in X gas reservoir, and the production index diagnosis curve is formed. The formation parameters are explained by fitting the casing pressure with the theoretical curve, and the pressure profile is obtained.Temperature profile, velocity profile.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37

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