Research Of Working Condition Diagnosis And Parameter Optimization Of Hydraulic Jet Pump On Steam Huff And Puff Well

Steam huff and puff is the main technology of heavy oil production.And the wellbore lifting use jet pump and the replacement of normal power fluid by high temperature water to drive the hydraulic jet pump.Steam huff and puff technology and jet pump lifting joint process can not only reduce heavy oil viscosity and improve wellbore flow conditions,but can also solve the problem of rod string and tubing wear of sucker of sucker rod pump and achieve the goal of cost reduction.In this thesis,working condition diagnosis and parameter optimization of jet pump are the main research content,in order to improve pump efficiency and recovery factor of oilfield.According to one throughput cycle of SY-16 H well of HN oilfield,modified yield,bottom hole moisture content and bottom hole temperature model are generated through the model modified by least squares regression.Based on the crude oil viscosity temperature relationship,oil and water mixture viscosity test and previous study of transition point prediction model and oil-water mixture viscosity model.The model closest to the experimental data is selected as the theoretical support for the software development for viscosity-temperature relationship and viscosity of the mixture.In the light of principle of heat transfer,heat transfer process and thermal resistance generated of multiple thermal fluid in the jet pump wellbore are researched and according to this,the temperature field model of the jet pump wellbore is established.The structural characteristics,working principle and basic theory of the jet pump are introduced,and the basic equations of the jet pump are derived.Under the numerical simulation of internal flow field of jet pump,the basic law of internal flow is revealed initially,and the coincidence of the simulated value and the measured value of the flow ratio at the highest efficiency is studied.Based on the parameters,which is flow,pressure and temperature,and the working conditions generated in the actual application of the field,the fault types of the jet pump well and the corresponding discriminating methods are summarized.Based on the characteristic parameters of the jet pump,power fluid parameters,production parameters,equipment parameters,etc.,the parameter optimization design model is designed by using the principle of enumeration method.The software for “diagnosis and parameter optimization of hydraulic jet pump on steam huff and puff well” is built.According to the research result,the theory and method in this thesis is scientific and reasonable,which provide the theory and technology support for daily working condition management and parameter optimization of steam huff and puff well using hydraulic jet pump.For inflow performance relationship model of steam huff and puff well,the modified average relative error of calculation of fluid production of capacity relationship is 12.93%.The modified average relative error is 15.34% for bottom hole moisture content and 9.89% for bottom hole flow temperature.According to simulation results,with the increase of area ratio,the negative pressure and the length of flow core zone increase,amd the optimal throat length decreases.Three oil fields on site are used for software reliability inspection.According to the working condition diagnosis,working condition indicator of A well is good and respective diagnostic advice for B well and C well is proposed,especially,parameter optimization is performed on C well.In the thesis,three representative schemes are selected to verify the influence of parameters such as area ratio,power fluid parameter and downhole pump depth on the working conditions of jet pump.The optimization scheme is affirmed in actual production.