Modeling the pressure characteristics of parallel chokes used in managed pressure drilling and related experiments  

作　　者：Liu Gonghui Zhang Tao Li Jun Yang Yulong 

机构地区：[1]China University of Petroleum,Beijing 102249,China [2]Beijing Information Science&Technology University,Beijing 100101,China

出　　处：《Petroleum Science》2012年第3期363-369,共7页石油科学（英文版）

基　　金：supported by Important National Science & Technology Specific Projects (2008ZX05021-003);National Natural Science Funds (50974021)

摘　　要：Based on the local resistance computation model for a choke valve and using the flow characteristics of choke valves, we studied the relationships between the back pressure of a parallel choke assembly and the opening extent of choke valves and developed a model to characterize the pressure regime of the manifold assembly. A comparison of pressure characteristic curves shows that a parallel choke manifold assembly has obvious advantages over the conventional serial type including high linearity of pressure-regulating characteristics curves, the elimination of the overshoot interval, wider effective regulating interval and the higher system security. Laboratory hydraulic experiments have validated the capability of a back pressure control model for the parallel choke assembly to accurately control pressure. This study is of great theoretical and practical significance to further improve the performance of chokes used in managed pressure well drilling.Based on the local resistance computation model for a choke valve and using the flow characteristics of choke valves, we studied the relationships between the back pressure of a parallel choke assembly and the opening extent of choke valves and developed a model to characterize the pressure regime of the manifold assembly. A comparison of pressure characteristic curves shows that a parallel choke manifold assembly has obvious advantages over the conventional serial type including high linearity of pressure-regulating characteristics curves, the elimination of the overshoot interval, wider effective regulating interval and the higher system security. Laboratory hydraulic experiments have validated the capability of a back pressure control model for the parallel choke assembly to accurately control pressure. This study is of great theoretical and practical significance to further improve the performance of chokes used in managed pressure well drilling.

关 键 词：MPD CHOKE parallel choke pressure control 

分 类 号：TH137[机械工程—机械制造及自动化] TM472[电气工程—电器]