大庆油田A区块压裂后产能影响因素研究

水力压裂是目前应用最为有效的一种增产措施,目前对于老区油井都会采取压裂的增产措施,其增产机理主要体现在增大渗流面积、连通地层深处、减少驱动距离等方面,但是对于压裂后裂缝形成规律以及压裂后产能影响因素需针对不同区块的地质特征进行分析。笔者通过理论公式分析大庆油田A区块地层裂缝形成规律,并模拟压裂后产量变化规律,判断A区块压裂前后产量影响因素,优化裂缝参数,研究结果表明:裂缝的半长对压裂后油井产量影响较大,当泵注排量较高时,地层岩石受力较大,造成其压裂后缝高较高,最终根据模拟结果优化裂缝参数,设计相应的泵注程序,对大庆油田A区块油井压裂的实际施工具有重要的指导意义。

Study on Influencing Factors of Productivity After Fracturing in Block A of Daqing Oilfield

Hydraulic fracturing is one of the most effective measures for increasing production, the old oil wells will take fracturing stimulation, and fracture formation rules after fracturing and the influence factors of productivity after fracturing need be analyzed based on the geological characteristics of different blocks. In this paper, fracture formation rules in block A of Daqing oilfield were analyzed based on theoretical formula, and the yield change rule after fracturing was simulated, influencing factors of productivity before and after fracturing in block A were investigated.The results showed that, the crack half-length had great impact on oil production after fracturing; when the pump output was high, the fracture height after fracturing was high. According to the simulation results, the fracture parameters was optimized, the corresponding pump injection program was designed.