摘要
高效、经济、环保的消泡技术是泡沫钻进流体循环利用的基础。根据气体引射器原理,设计了一种新型旋内喷式机械消泡装置,以压缩空气为动力介质,联合真空负压、冲击剪切、充气饱和及减速增压扩散4种作用方式快速消泡,实现泡沫流体的循环利用。利用计算流体动力学软件FLUENT对消泡器内部速度和压力流场进行了数值模拟分析,结果表明:旋内喷式消泡器内部产生两个相邻重叠的真空负压区域,能够对外界流体产生巨大的抽吸力,抽吸量是入口压缩空气质量流的1.6倍左右;当入口压缩空气的质量流为0.1 kg/s时,消泡器中心最大负压值达到了21 kPa;在交汇式喷射孔的多股射流交汇碰撞点附近,由于速度的提升,形成了一个更大的负压区域,对消泡产生积极作用。
Efficient,economical and environment-friendly defoaming technology is the basis for achievement of foam drilling fluid recycling.A novel rotary and spray type of foam breaker was designed according to the gas ejector principle by which compressed air was used as the power medium combined with vacuum negative pressure,impact shear,aerated saturation and pressure diffusion for quick defoaming and foam fluid recycling.The computational fluid dynamics software FLUENT was employed to simulate the flow characteristics inside the foam breaker.The simulation results showed that the rotary and spray type of foam breaker generated two adjacent overlapping vacuum negative pressure areas inside and can produce great suction force on the outside flow with the suction amount about 1.6 times the compressed air at the inlet.The maximum negative pressure can reach 21kPa inside of the foam breaker when the mass flowrate of the compressed air flow at the inlet was 0.1kg/s,generating a larger area of negative pressure near the collision point of multiple jets from the converging nozzles due to jet speed boost which is conducive to defoaming.
作者
王劲松
蒋建良
潘永坚
蔡国成
李高山
WANG Jinsong;JIANG Jianliang;PAN Yongjian;CAI Guocheng;LI Gaoshan(Shenzhen Land Investment and Development Center, Shenzhen Guangdong 518000, China;Zhejiang Engineering Investigation Institute, Ningbo Zhejiang 315012, China)
出处
《探矿工程（岩土钻掘工程）》
2020年第5期53-59,共7页
Exploration Engineering:Rock & Soil Drilling and Tunneling
基金
宁波市自然科学基金项目“地热资源勘探开发多工艺泡沫气举反循环钻探关键技术研究”(编号:2017A610318)。
关键词
泡沫钻进
流体循环
消泡技术
气体引射器
旋内喷式消泡器
foam drilling
fluid circulation
defoaming technology
gas ejector
rotary and spray type of foam breaker
