节流管汇冲蚀磨损研究及结构改进

提高节流管汇的抗冲蚀能力、减少节流管汇的失效概率,对于成功控制溢流、实现井控安全有重要意义。从冲蚀磨损机理、数值模拟仿真和结构改进等方面开展了节流压井管汇防冲蚀磨损研究。模拟结果认为,随着开度的增大,钻井液冲蚀速度在不断降低,但钻井液速度仍高于临界冲蚀速度,冲蚀区域主要发生在下游管路入口和出口附近的管壁上。针对数值分析结果,提出了节流管汇结构改进方案。改进后的节流管汇现场试验时,防冲刺短节内部无明显的冲蚀现象,防刺效果较好,满足现场使用要求。

Research on the Erosion and Wear of Throttle Manifold and Structural Improvement

Improvement of anti-erosion capacity of throttle manifold and reduction of failure probability of throttle manifold are of vital importance to ensuring successful control of overflow and achieving well control safety.The anti-erosion and anti-wear research of throttle well-killing manifold was conducted in mechanism of erosion and wear,numerical simulation and structural improvement.The simulation shows that with the increase of opening,the erosion velocity of drilling fluid decreases constantly but the drilling fluid velocity is still higher than the critical erosion velocity.According to the numerical analysis of the throttle manifold erosion zone which mainly appears at the inlet and outlet of downstream pipeline,the scheme for improving the throttle manifold structure was formulated.No remarkable erosion occurred within the erosion resistance sub after the field application of the improved throttle manifold.The erosion-resistant effect is desirable,satisfying the requirement of field application.