射孔参数对致密油压裂效果影响

发布时间：2018-12-10 18:54

【摘要】：致密油储层体积压裂相关的理论与工艺研究已成为油气行业的热点问题。射孔是连接井筒、地层和裂缝的关键通道,为体积压裂提供压裂动力。射孔参数成为控制井筒附近地层起裂,影响后续水力压裂的重要因素之一。研究射孔参数对致密油压裂效果影响是推动致密油体积压裂工艺研究深化的重要先导性工作。本文选用数值模拟与物模实验相结合的方法研究射孔参数/工艺对裂缝起裂、扩展及近井筒裂缝形态的影响,主要内容包括:1、探讨了射孔-体积压裂基本关联机制,深化了射孔与体积压裂之间关系的认识。2、建立了直井和水平井地质力学模型,采用有限元数值模拟方法定量分析了射孔参数对起裂压力与起裂位置的影响;研究了射孔与水力压裂裂缝形态(垂直缝、水平缝、双缝、多缝、体积缝等)之间的关系。3、以断裂力学为基础建立断裂-应力耦合力学模型,分析了射孔参数、压裂动力及地层性质对裂缝扩展轨迹的影响。射孔作为初始裂缝处理,将射孔与裂缝扩展紧密联系起来。4、针对近年来提出的定面射孔工艺进行物理模拟及数值模拟,研究其对体积压裂的影响。研究结果表明定面射孔产生的裂缝依然以垂直最小主应力方向的裂缝为主,但沿着射孔方向会出现相对迂曲和复杂的裂缝增加了裂缝复杂度,会对直井体积压裂会产生一定的贡献。
[Abstract]:The theoretical and technological research on volume fracturing of tight oil reservoir has become a hot issue in oil and gas industry. Perforation is a key channel to connect wellbore, formation and fracture, which provides fracturing power for volume fracturing. Perforation parameter is one of the important factors to control formation initiation near wellbore and affect subsequent hydraulic fracturing. The study of the effect of perforation parameters on the fracturing effect of compact oil is an important forerunner to promote the study of compact oil volume fracturing technology. In this paper, the effects of perforation parameters / process on fracture initiation, propagation and fracture morphology near wellbore are studied by means of numerical simulation and physical model experiment. The main contents are as follows: 1. The basic correlation mechanism of perforation-volume fracturing is discussed. The relationship between perforation and volume fracturing is deepened. 2. The geomechanical models of vertical well and horizontal well are established, and the influence of perforation parameters on the initiation pressure and location is quantitatively analyzed by using finite element numerical simulation method. The relationship between perforation and fracturing fracture morphology (vertical fracture, horizontal fracture, double fracture, multiple fracture, volume fracture, etc.) is studied. 3. Based on fracture mechanics, a fracture stress coupled mechanical model is established, and perforation parameters are analyzed. The influence of fracturing dynamics and formation properties on fracture propagation trajectory. As initial fracture treatment, perforation is closely related to fracture propagation. 4. Physical simulation and numerical simulation are carried out to study the effect of perforation on volume fracturing. The results show that the fractures produced by the fixed plane perforation are still perpendicular to the direction of the minimum principal stress, but the relatively tortuous and complex fractures along the perforation direction increase the fracture complexity. Will produce certain contribution to the vertical well volume fracturing.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357

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