Optimization Design of Hydraulic Impactor for Oil and Gas Drilling

Due to the large depth, large diameter of oil and gas wells, and complex downhole conditions, to use of traditional hydraulic impactors in oil and gas drilling is prone to cause problems such as not obvious ROP increasing and short service life. For this purpose, a high-power and long-life hydraulic impactor for oil and gas drilling is developed. Due to the complex internal pressure matching relationship of hydraulic impactor, many factors affect impact performance. It is difficult to find the optimal matching relationship of various factors based on experience and experimental methods. Therefore, a dynamic model of the hydraulic impactor is established, and a simulation calculation software for the performance parameters is developed. The bench test results indicate that the working principle of the hydraulic impactor is feasible. The coincidence rate between the software calculated result of performance parameters and bench test result is over 95%. Through orthogonal experiments, the optimal combination of structural parameters of the hydraulic impactor is designed. The conclusion is that under the existing drilling pump displacement and pump pressure conditions, improving the structure of the hydraulic impactor to achieve a large work displacement can effectively improve the impact performance of the hydraulic impactor.