Design and Test of Down-Hole Micro-Flow Device for Monitoring Overflow
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摘要: 为了能够准确判断井下复杂情况,基于节流压差原理,以稳定器结构为基础,研制了一种井下压差式环空微流量测量装置,精确测量从钻杆进入井底和环空返回流体流量的微小变化,并通过MWD将井下数据实时传输至地面上,提高了微流量装置对井底复杂情况的判断能力和监测精度,实现了对井底溢流的实时监测。根据建立的微流量测量短节的理论模型,推导出溢流时流量变化与压差的关系式,采用ANSYS有限元模拟软件进行了不同工况模拟,并与现场采集的试验数据进行了分析对比。现场试验表明,微流量测量装置运行稳定、无故障,经受住了现场多种工况的考验,实际测量灵敏度达到了0.5 L/s,对监测井底溢流、特别是气侵具有明显的优势。Abstract: In order to monitor down-hole complex conditions,a new micro-flow rate measurement device,based on the structure of stabilizer and choke pressure difference theory,had been developed.It monitors the micro-flow rate changes of drilling fluid from inside drill pipe to annulus space accurately,and transmitts the data or information to the surface by MWD,improving the ability of monitoring complicated downhole conditions,and realizing real time monitoring of overflow.This article introduced the theoretical model of micro-flow rate nipple,derived mathematical formulas of flow rate change and pressure difference when oil and gas kicking,used ANSYS to simulate different working conditions,analyzed and compared theoretical calculation result with experimental data collected in the field.The field test showed that the device ran stablely for a long time,and endured every kind of trial in different conditions,the actual sensitivity had reached 0.5 L/s,with obvious superiority for monitoring bottomhole kicks,especially for gas kick.
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Keywords:
- overflow /
- micro-flow /
- pressure difference /
- monitoring
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