During the long-term development of oil wells, reservoir pore throats and the near-wellbore area are highly susceptible to clogging, driven by extended production cycles, declining reservoir pressure gradients, and the complex interactions between injected fluids, formation fluids, and the reservoir matrix. This blockage has become a critical bottleneck restricting the release of oil well productivity. To address this challenge, a self-suction jet tool based on the Venturi effect was designed and optimized in this study. Using a coupled computational fluid dynamics-discrete element method simulation, the effects of front nozzle inclination, front nozzle length, distance between the front nozzle and the rear nozzle, and throat diameter on the tool's negative pressure characteristics and particle kinetic energy were systematically investigated. The results indicate that the tool's self-suction negative pressure and suction mass reach their peak at a front nozzle inclination of 30°. With a front nozzle length of 14 mm, the abrasive particles achieve maximum total kinetic energy. Although increasing the distance between the front nozzle and the rear nozzle sacrifices a portion of the negative pressure value, it significantly enhances particle suction mass by expanding the suction zone. At a diameter of 9.5 mm, the tool effectively balances high suction mass with particle velocity, resulting in optimal total jet kinetic energy. Impact tests on casing cement plugs confirmed that the erosion volume of the optimized tool is 3.78 times greater than that of the preoptimized design. This research provides a theoretical foundation and experimental basis for self-suction jet technology in reservoir plugging removal.
Shi et al. (Wed,) studied this question.
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