页岩油双水平井逐级加密压裂辅助重力开采研究

Study on Step-by-step Infilling Fracturing Assisted Gravity Recovery Technology for Shale Oil Double Horizontal Wells

由于页岩油层构造复杂,传统页岩油开采技术开发时间长,采收率低,短时间内难以获得经济效益,工业化开发难度大,因此,研究新的页岩油增产技术显得尤为重要。以某页岩油藏为例,通过油藏工程计算确定合理参数,运用数值模拟的方法对页岩油藏体积压裂提高采收率进行模拟研究,提出了双水平井逐级加密压裂的页岩油开发方式。研究结果表明,双水平井逐级加密压裂辅助重力开采可有效提高页岩油储层的产量。当只对生产井进行逐级加密压裂时,累产油量较常规压裂提高了67.37%;当对注入井进行常规压裂、生产井进行逐级加密压裂时,累产油量相比于常规压裂提高了3倍。该研究为高效动用页岩油资源、提高页岩油开发效益提供了参考。

Because of the complex structure of shale oil layer, the traditional shale oil production technology has a long development time, low recovery factor, and it is difficult to obtain economic benefits in a short time. Therefore, it is very important to study new shale oil production technology. Taking a shale reservoir as an example, reasonable parameters are determined through reservoir engineering calculation, and enhancing oil recovery of shale reservoir by volume fracturing is studied by numerical simulation. A shale oil development mode of double horizontal well step-by-step infilling fracturing is proposed. The research results show that the production of shale oil reservoir can be effectively improved by double horizontal well step-by-step infilling fracturing assisted gravity recovery technology. When the production well is only subjected to step-by-step infilling fracturing, the cumulative oil production is 67.37% higher than that of conventional fracturing;When conventional fracturing is carried out for injection wells and step-by-step infilling fracturing is carried out for production wells, the cumulative oil production is 3 times higher than that of conventional fracturing. This study provides a reference for efficient utilization of shale oil resources and improvement of shale oil development benefits.