深层大斜度井段多因素耦合排采泵动态特性及气-水-粉多相流态运移机制

综合低沉没度、低流速、低粘度和高气液比多因素耦合影响，建立大斜度井段弹动式泵阀动力学、井液流经泵阀阀隙水力摩阻、三层流场水粉两相流压力梯度和运移速度场、泵筒动态充满度、多流型三相流煤粉滑移压力损失及速度场的动态模型，基于数值仿真、室内实验和井场试验测试相结合方法，攻克大斜度泵阀漏失和开启滞后、低速液流固相含量高且携煤粉能力差、高气液比造成充满度下降等业内前沿和技术瓶颈，揭示大斜度泵阀随井液和弹簧高效运行动力学特性、三层流场水粉两相流态运移机制、气水两相流态运移机制和多流型气水粉三相流态运移机制，提出一种低沉没度高气液比大斜度泵高效排采及低流速大斜度泵筒液流携粉顺利排出新方法，构建深层大斜度井段排采泵系统设计方法和技术体系，破解多因素耦合大斜度泵动态运行特性及其多相流态运移机制的科学本源问题，对提升三气合采深层大斜度井段排采泵的可靠性和泵效以及多相流态煤粉防控具有重要的科学意义和实用价值。

Mathematical models of dynamics of spring-actuated pump valve, hydraulic loss for water flow through valve, pressure gradient and velocity of water-coal two phase flow in three-layer field, dynamic water level in cylinder, pressure loss and velocity field of three-phase flow with multi-flow type will be developed under the coupling conditions of low submergence, low flow rate, low viscosity and high CBM-water ratio. The problems and bottlenecks of valve leakage and opening lag, high coal concentration and poor sand carrying capacity in low flow rate and low dynamic water level with high CBM-water ratio are solved on numerical simulations, experiments and tests in coalbed methane (CBM) high inclination well sections. The dynamics of pump and mechanisms of water-coal two phase flow in three-layer field, CBM-water two phase flow and three-phase flow with multi-flow type are revealed in CBM high inclination well sections. The methodologies of pump running with high efficiency and coal with water are proposed under the coupling conditions. The design and technical systems are created for sucker rod pumps in CBM high inclination well sections. The source problems of dynamics on pump and moving mechanism of CBM-water-coal multiphase flow are solved under the coupling conditions. Moreover, this work will provide theoretical basis and technical support for improving reliability and efficiency of pumps and controlling coal in multiphase flows of three gas combined mining.