天然气水合物储层空化射流解堵喷嘴性能分析与试验研究

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中图分类号：TE375文献标识码：ADOI：10.12473/CPM.202408003

Abstract： To solve the problem of productivity decline resulted from plugging of screen by natural gas hydrate in the Shenhu area，South China Sea，the internal and external flow fields of Helmholtz and organ-pipe nozzles were simulated numericalyusing computational fluid dynamics （CFD）.The fluid field velocityand gas content were usedas the main criteria to investigatethe performanceof plug removal by two typesofcavitation jet nozzles in natural gas hydrate reservoirs. Moreover，a screen with simulated plugging by mud-sand deposits of natural gas hydrate in the Shenhu area was prepared to verifytheactual effect and evaluate the performance of nozzles.The study results show thatunder natural gas hydrate reservoir conditions，the organ-pipe nozle exhibits slower velocitydecay，generates more bubbles in the external flow field，and delivers superior cavitation performance to the Helmholtz nozzle.The nozzle structure has apparent impacts on the pressure on the screen exterior after plug removal，in terms of which the organ-pipe nozzle outperforms the Helmholtz nozle by achieving an 18.1% greater plug removal effect. Moreover， the organ-pipe nozzle enables a screen permeability 32.5% higher than the Helmholtz nozzle. The study results provide areference for plug removal of natural gas hydrate by cavitation jet.

Keywords：natural gas hydrate；cavitation jet；organ-pipe nozle；Helmholtz nozzle；plug removal;perme. ability

0 引言

我国南海神狐海域天然气水合物储层沉积物以细粒的泥质粉砂或粉砂质泥为主，沉积速率较高[1-3]。（剩余8564字）