压裂水平缝对油井产能影响规律研究

发布时间：2018-05-20 13:49

本文选题：压裂水平缝 + 油藏　；参考：《西南石油大学》2015年硕士论文

【摘要】：在油气的开采过程中,水力压裂是提高油气井产能的重要措施。在一些埋藏较浅的储层以及异常高压储层水力压裂容易产生水平缝。国内外学者关于压裂水平缝对油井产能的影响研究较少。已有方法存在针对性不足和求解过程复杂的问题。近年来,随着计算机软硬件技术和数值模拟技术的发展,人们可以模拟越来越复杂的油田地质特征,模拟精度也越来越高。本文将传统的产能评价方法和数值模拟技术进行结合,基于数值模拟及水平缝相关理论,开展了以下研究工作：(1)压裂水平缝的形成条件、形态特征及带压裂水平缝储层中流体渗流特征；(2)压裂水平缝数值模拟相关技术；(3)地层渗透率各向异性、地层宽高比、支撑剂量、裂缝垂向位置及裂缝形态等因素对带裂缝油井产能的影响；(4)衰竭式开发中不同地质及施工条件下裂缝最佳尺寸和相应的油井产能；(5)当使用五点、九点或者七点井网进行注水开发时,不同性质的水平缝对油井产能的影响。通过综合研究及分析,主要得出以下结论：(1)水力压裂形成水平缝的深度由地应力条件决定,当地层应力受到开发因素的影响发生改变时,深度会相应的发生改变；(2)编制的网格生成程序可以高效的将压裂模拟程序与油藏数值模拟程序进行衔接,弥补现有数值模拟器在网格生成方面的不足；(3)编制的计算不同条件下裂缝最佳尺寸(最大导流能力)和油井产能的程序具有在工程中应用的可行性；(4)对于低渗透地层,实施压裂产生水平缝具有非常显著的增产效果；(5)压裂水平缝的形状和角度对注水开发中油井产能有明显影响；(6)对于实施过压裂增产并且裂缝为水平缝的地层,在注水开发前需要监测裂缝形状及方位,对于裂缝性质不同的地层,选用合适的井网能有效的提高开采效率。
[Abstract]:Hydraulic fracturing is an important measure to improve the productivity of oil and gas wells in the process of oil and gas production. In some shallow reservoirs and abnormal high pressure reservoirs hydraulic fracturing is easy to produce horizontal fractures. There is little research on the effect of horizontal fracturing fracture on well productivity at home and abroad. The existing methods have shortcomings in pertinence and complexity in the process of solving them. In recent years, with the development of computer software and hardware technology and numerical simulation technology, people can simulate more and more complex geological characteristics of oil field, and the simulation accuracy is becoming higher and higher. In this paper, the traditional productivity evaluation method and numerical simulation technology are combined. Based on the theory of numerical simulation and horizontal fracture correlation, the following research work is carried out on the formation conditions of horizontal fracturing fracture. Morphological characteristics and fluid percolation characteristics in reservoirs with fracturing horizontal fractures A correlation technique for numerical simulation of fracturing horizontal fractures, I. e., anisotropy of formation permeability, ratio of formation width to height, support dose, Effect of fracture Vertical position and fracture form on production capacity of well with fractures (No. 4) the optimum size of fractures and the corresponding production capacity of oil wells under different geological and construction conditions should be used at five points. The effect of horizontal fractures of different properties on well productivity when water injection is carried out in nine or seven spot pattern. Through comprehensive research and analysis, the following conclusions can be drawn: (1) the depth of horizontal fracture formed by hydraulic fracturing is determined by the stress condition in situ, and when the local layer stress is affected by the development factors, The mesh generation program can efficiently connect the fracturing simulation program with the reservoir numerical simulation program. To make up for the shortage of the existing numerical simulator in grid generation, the program for calculating the optimum fracture size (maximum flow conductivity) and well productivity under different conditions has the feasibility of application in engineering. For low permeability formations, The shape and angle of horizontal fracture have obvious influence on oil well productivity in water injection development. It is necessary to monitor the shape and orientation of fractures before the development of water injection. For the formations with different fracture properties, the selection of appropriate well pattern can effectively improve the production efficiency.
【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】：TE328

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