Design and Simulation Analysis of Downhole Hydraulic Booster

The existing researches use simplified booster cavity model or only use numerical simulation to simulate the boosting performance of hydraulic booster, which may lead to unreliable calculation results. Therefore, based on the actual drilling technology requirements, this article presents a downhole hydraulic booster that uses downhole hydraulic energy to boost pressure; based on the structure and working principle of the booster, the authors firstly built the mathematical model and fluid domain model of the booster cavity; then, used Matlab numerical simulation and Fluent dynamic gridding technique simulation to simulate the boosting performance of the booster cavity, and finally, conducted comparative analysis on their results to verify the correctness of the research results. The research results show that, in the process of boosting, the piston movement speed, the fluid ejection velocity and the fluid pressure of rod booster cavity all increase first and then gradually stabilize with time; as the diameter of the high pressure outlet decreases and the effective action area ratio of the low pressure cavity to the rod booster cavity increases, the fluid pressure in the rod booster cavity increases, the fluid ejection velocity at the high pressure outlet increases, and the boosting effect of the booster is more obvious; after the structural parameters of the booster cavity have been optimized, when the diameter of the high pressure outlet is not larger than 8 mm and the effective action area ratio of the low pressure cavity to the rod booster cavity is not less than 3.5, the boosting effect of the booster can be enhanced. The research results provide theoretical supports for the optimum design of the booster.