A gas kick early detection method outside riser based on Doppler ultrasonic wave during deepwater drilling
作者：YIN Bangtang,LIN Yingsong,WANG Zhiyuan,SUN Baojiang,LIU Shujie,SUN Jinsheng,HOU Jian,REN Meipeng,WANG Ning
摘要：The feasibility of gas kick early detection outside the riser was analyzed based on gas-liquid multiphase flow theory.Then an experimental platform for gas kick early detection based on Doppler ultrasonic wave was established and the propagation experiments in two-phase flow of gas-water(sucrose solutions)were conducted.The time and frequency domains of the Doppler ultrasonic wave signals during the experiments were analyzed.The results show that:(1)No matter the pump was on or off,the detected average Doppler ultrasonic signal voltage increased first and then decreased with the increase of the gas void fraction,and had a quadratic function relation with gas void fraction,so the average voltage change of the monitored signals can be used to deduce the approximate gas void fraction.The Doppler ultrasonic wave signal voltage was significantly reduced in magnitude and variation in the solution with higher viscosity,and the viscosity has stronger impact on the magnitude of signal than density.(2)When the pump was stopped,the Doppler shift increased with the increase of gas void fraction,and the two showed a nearly linear relation,so the detected amount of Doppler shift can reflect the variation of gas void fraction quantitatively.When the pump was on,the sound energy produced by frequency converter had a more significant impact on amplitude spectrum than gas void fraction,so it is impossible to determine whether gas kick occurs by frequency domain signal analysis.(3)This method is a non-contact measurement,with no contact with the drilling fluid and no disruption to the drilling operation.It can quantitatively characterize the gas void fraction according to the change of Doppler ultrasonic signal,enabling earlier detection of gas kick.
發文機構：Key Laboratory of Unconventional Oil&Gas Development School of Petroleum Engineering CNOOC Research Institute Co.Ltd.
關鍵詞：deepwaterdrillingRISERDopplerultrasonicwavegas-liquidtwophaseflowsignalanalysisearlydetectionofgaskick
分類號： TE951[石油與天然氣工程—石油機械設備]
- Enrichment and exploration of deep lacustrine shale oil in the first member of Cretaceous Qingshankou Formation, southern Songliao Basin, NE China
- A coupled model of temperature and pressure based on hydration kinetics during well cementing in deep water
- Scaled physical experiments on drainage mechanisms of solvent-expanded SAGD in super-heavy oil reservoirs
- Diagenetic evolution and formation mechanisms of middle to deep clastic reservoirs in the Nanpu sag, Bohai Bay Basin, East China
- Artificial neural network based production forecasting for a hydrocarbon reservoir under water injection
- An evaluation method of volume fracturing effects for vertical wells in low permeability reservoirs
- Main flow channel index in porous sand reservoirs and its application
- Effects of vugs on resistivity of vuggy carbonate reservoirs
- Pore-throat structure characteristics and its impact on the porosity and permeability relationship of Carboniferous carbonate reservoirs in eastern edge of Pre-Caspian Basin
- Structural failure mechanism and strengthening method of fracture plugging zone for lost circulation control in deep naturally fractured reservoirs