Structure optimization of the organ-pipe cavitating nozzle and its erosion ability test on hydrate-bearing sediments  

作　　者：Xiao-Ya Wu Yi-Qun Zhang Zhen-Qiang Xu Shuai Zhao Gen-Sheng Li Shou-Ceng Tian Ya-Wen Tan Ke-Wen Peng 

机构地区：[1]College of Petroleum Engineering,China University of Petroleum-Beijing,Beijing,102249,China [2]College of Safety and Ocean Engineering,China University of Petroleum-Beijing,Beijing,102249,China [3]State Key Laboratory of Natural Gas Hydrate,China University of Petroleum-Beijing,Beijing,102249,China [4]National Engineering Research Center of Gas Hydrate Exploration and Development,Guangzhou Marine Geological Survey,Guangzhou,510075,Guangdong,China [5]Guangdong Provincial Key Laboratory of Distributed Energy Systems,Dongguan University of Technology,Dongguan,523808,Guangdong,China

出　　处：《Petroleum Science》2023年第2期1104-1118,共15页石油科学（英文版）

基　　金：financially supported by National Natural Science Foundation of China(No.52174009 and No.51827804);Marine Economy Development Foundation of Guangdong Province(GDNRC[2022]44)“Technical Support for Stimulation and Testing of Gas Hydrate Reservoirs”.

摘　　要：Cavitating jet is a promising drilling rate improvement technology in both the marine natural gas hydrate (NGH) fluidization exploitation method and the integrated radial jet drilling and completion method. In present study, we aim to improve the efficiency of jet erosion and extracting NGH. With a computational fluid dynamics (CFD) method, the pressure, velocity and cavitation field characteristics of organ-pipe cavitating jet (OPCJ) are analysed. The divergent angle, throat length, and divergent length of OPCJ nozzle are preferred to obtain stronger jet cavitation erosion effect. Laboratory experiments of gas hydrate-bearing sediments (GHBS) erosion by OPCJ and conical jet (CJ) are conducted to compare and validate the jet erosion performance. The impinging models of OPCJ and CJ are constructed to study the impact characteristics. Results show that the preferred values of divergent angle, throat length, and divergent length are 15°, 1d, and 3d, respectively, in present simulation conditions. For GHBS, the OPCJ possesses the advantages of high efficiency and low energy consumption. Moreover, the OPCJ has higher penetration efficiency, while showing equivalent penetration ability compared to CJ. During the impinging process, the OPCJ can induce stronger impact pressure and turbulence effect, and also shows stronger chambering effect and bottom cleaning ability compared to CJ. This study presents the erosion performance of OPCJ and CJ on GHBS, and provides preliminary insights on the potential field applications in NGH exploitation.

关 键 词：Natural gas hydrate Cavitating jet Structure optimization Computational fluid dynamics Experimental study 

分 类 号：P634.3[天文地球—地质矿产勘探]