徐深气田气井压裂产量预测方法研究

发布时间：2018-04-18 16:10

本文选题：压裂气井 + 三线性流　；参考：《东北石油大学》2017年硕士论文

【摘要】：在己探明的天然气储藏中,属于低渗透以及特低渗透的储层占据了相当大的比例,低渗透气藏由于渗透率低,表现为单井产量低,有的气藏不压裂就无自然产能,因此,普遍采用水力压裂等增产措施进行对低渗透气藏储层进行改造。2002年大庆油田徐家围子地区发现大型的低渗透火山岩气藏,但在此类复杂岩性储层压后产量预测方面,大多采用砂岩均质气藏压后产量预测模型,与实际差别较大,而且不能准确分析影响压裂气井产能的主要因素,使得深层复杂岩性气井(尤其是开发气井)的压裂规模优化缺乏依据,为此,针对以上问题,本文进行了如下工作:首先,调研了徐深气田火山岩气藏的基本特征,分析了三重孔隙介质火山岩储层气井压后流动形态,运用椭圆流理论和三线性流理论建立了火山岩储层常规达西渗流和低速非达西渗流条件下的压裂气井产量预测数学模型,给出了压裂气井产量预测的基本原理。第二,利用拉普拉斯反演及杜哈美原理,得到了火山岩储层压裂气井产量随时间变化的解析解,绘制了火山岩储层压裂气井产量递减双对数典型曲线,讨论了气藏储层气井压裂后产量递减规律,分析了储层参数及裂缝参数对气井压后产量递减曲线的影响规律。第三,绘制了气井压后产量预测理论图版、裂缝半长以及导流能力优化理论图版,得到了不同条件下的参数优化曲线,对裂缝半长及导流能力进行了优化分析,给出了压裂裂缝半长和裂缝导流能力的优选方法,利用优化曲线对裂缝半长及导流能力对增产效果的影响进行了分析,并对实际压裂气井的压裂方案进行了优化设计。第四,结合XYA区块火山岩气藏的地质、测井和压裂设计等有关资料,给出了火山岩气藏储层开发气井压裂后产量预测所需参数的确定方法,建立了一套适用于XYA区块火山岩气藏开发气井压后的产量预测方法,并用开发气井实例对产量预测方法进行了验证。
[Abstract]:In the proven natural gas reservoir, low permeability and ultra-low permeability reservoirs occupy a large proportion. Because of their low permeability, low permeability gas reservoirs are characterized by low single well production, and some gas reservoirs have no natural productivity without fracturing, so,Hydraulic fracturing is widely used to improve the low permeability gas reservoir. In 2002, large low permeability volcanic rock gas reservoir was discovered in Xujiaweizi area, Daqing Oilfield.Most of them adopt the prediction model of post-pressure production of sandstone homogeneous gas reservoir, which is quite different from practice, and can not accurately analyze the main factors that affect the productivity of fracturing gas well.It makes the fracturing scale optimization of deep and complex lithologic gas wells (especially development gas wells) lack the basis. In view of the above problems, this paper has carried out the following work: firstly, the basic characteristics of volcanic gas reservoirs in Xushen gas field have been investigated.In this paper, the flow pattern after gas well pressure in volcanic reservoir with triple porosity is analyzed, and the mathematical model of fracturing gas well production prediction under the condition of conventional Darcy percolation and low velocity non-Darcy percolation is established by using elliptical flow theory and trilinear flow theory.The basic principle of production prediction for fractured gas wells is given.Secondly, by using Laplacian inversion and Duhamet principle, the analytical solution of fracturing gas well production with time in volcanic rock reservoir is obtained, and the double logarithmic typical curve of production decline of fractured gas well in volcanic rock reservoir is drawn.The law of production decline after gas well fracturing in gas reservoir is discussed, and the influence of reservoir parameters and fracture parameters on production decline curve after gas well pressure is analyzed.Thirdly, the theoretical chart of prediction of production after gas well pressure is drawn, the theoretical chart of optimization of fracture half length and conductivity is drawn, the parameter optimization curves under different conditions are obtained, and the fracture half length and conductivity are optimized and analyzed.The optimum selection method of fracture half length and fracture conductivity is given. The effect of fracture half length and flow conductivity on production increase is analyzed by using the optimization curve, and the fracturing scheme of actual fracturing gas well is optimized.Fourthly, based on the geological, logging and fracturing data of volcanic gas reservoirs in XYA block, the method of determining the required parameters for prediction of production after fracturing in volcanic gas reservoirs is given.A set of production prediction methods suitable for the development of volcanic gas reservoirs in XYA block are established, and the prediction method is verified by the example of development gas wells.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE377

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