Research On The Lifting Of Blending Light Hydrocarbon Within Tubing-casing Annular Space In Deep Heavy Oil ESP Wells

The lifting of blending light hydrocarbon within tubing-casing annular space is widelyused in Tahe oilfield. Temperature and flow characteristics of fluid in wellbore is affected byblending light hydrocarbon, and related to volume, temperature and pressure of blending lighthydrocarbon. The lifting of blending light hydrocarbon within tubing-casing annular spacecan’t be optimization design. In order to improve the development of heavy oil reservoir inTahe, according to the experimental data of blending light hydrocarbon, regressive V-Trelation formula under different ration of blending light hydrocarbon is done.Comprehensively considering the influence of the heating of submersible motor and cable andparameters of blending light hydrocarbon, and according to the law of the conservation ofheat energy, temperature calculation model of blending light hydrocarbon under pump intubing-casing annular space in ESP wells is developed. The influence of different temperatureand volume of blending light hydrocarbon, and diluting depth on the temperature distributionof wellbore fluid are analyzed. The model of dynamic liquid level testing time is developedwith respect to unpredictable or even immense dynamic liquid level of blending lighthydrocarbon ESP wells. Considering the influence of blending light hydrocarbon, the modelof system efficiency of blending light hydrocarbon ESP wells is built. According to the nodeanalysis method, the lifting design and optimization design model of blending lighthydrocarbon under pump in tubing-casing annular space in ESP wells is developed. Theinfluence of volume, temperature and pressure of blending light hydrocarbon on systemefficiency and tons of fuel consumption are analyzed. The study shows that, in the liftingtechnique of blending light hydrocarbon under pump in tubing-casing annular space in ESPwells, with increasing of temperature of blending light hydrocarbon, temperature of outputfluid close to the wellhead increases, and it is favorable for surface transportation. Withincreasing of the volume of blending light hydrocarbon, temperature of output fluid whichclose to wellhead increases, while temperature of output fluid which close to diluting depthdecreases slightly. Output fluid temperature decreases with the addition of diluting depth andthe function of lower temperature decreases from diluting depth to wellhead. In the liftingtechnique of blending light hydrocarbon under pump in tubing-casing annular space in ESP wells, with increasing of temperature of blending light hydrocarbon, temperature of outputfluid which close to the diluting depth don’t change much, while temperature of output fluidwhich close to the wellhead increases, and it is favorable for surface transportation. Withincreasing of the volume of blending light hydrocarbon, temperature of output fluid whichclose to wellhead increases, while temperature of output fluid which close to diluting depthdecreases slightly. Output fluid temperature is slightly increasing with addition of dilutingdepth. TK675X well and TH10207well are optimized. Take TH10207well, for example, withincreasing of ratio of blending light hydrocarbon, system efficiency decreases, and tons offuel consumption increases. With increasing of the depth of blending light hydrocarbon,system efficiency first increases, then decreases, and has optimized the depth of blending lighthydrocarbon. With increasing of the depth of blending light hydrocarbon, tons of fuelconsumption decreases. With increasing of the pressure of blending light hydrocarbon, outputfluid decreases, and system efficiency decreases, and tons of fuel consumption increases. Takethe data of TK675X well and the optimized design for the lifting technique of blending lighthydrocarbon under pump in tubing-casing annular space in ESP wells. With increasing ofratio of blending light hydrocarbon, system efficiency and tons of fuel consumption firstdecreases, then increases. With the goal of tons of fuel consumption, there is an optimized thedepth of blending light hydrocarbon. With increasing of the depth of blending lighthydrocarbon, system efficiency decreases, tons of fuel consumption first increases, thendecreases. With increasing of the pressure of blending light hydrocarbon, output fluiddecreases, and system efficiency decreases, and tons of fuel consumption increases. Thisstudy can provide theory and means for the lifting technique of blending light hydrocarbonwithin tubing-casing annular space in deep heavy oil ESP Wells, and can improve effect oflifting and benefits.