| With the development of oil reservoirs,a large amount of sand is often easily mixed into the oil layer,and the sand with a larger content blocks the sand control pipe,causing the liquid volume to drop quickly,and the low liquid is inefficient.However,the amount of sand discharged is increasing,the suction capacity of the rod pump is limited,and the amount of sand discharged is low,which cannot meet the requirements of sand discharge and block removal measures.The traditional jet pump has large disadvantages for sand carrying work.According to this situation,referring to the working principle of the traditional jet pump,combined with the actual oil field well conditions,a double-tube water jet sand carrying pump was designed.The needs of engineering development put forward higher requirements for the use of jet pumps.The jet pump oil recovery technology is very mature,but the sand discharge technology is not yet perfect.In addition,the current single-phase flow model is not suitable for jet pumps that carry sand in oil wells,and the two-phase flow theory must be adopted.There are few studies on the characteristics of the two-phase flow field of jet pumps,so it is of great engineering significance to explore the flow field of the jet pump with sand.The internal flow field of the jet-carrying sand pump is complicated.During the sand-carrying process,high-pressure water gushes from the nozzle through the throat to form a negative pressure in the chamber,sucking out the sand particles at the bottom of the well,and mixing the solid-liquid two-phase fluid will generate greater energy.Loss,resulting in low efficiency of the jet pump,this factor restricts the sand carrying work of the jet pump.Therefore,analyzing the solid-liquid flow field of the jet pump and exploring the influence of its structural parameters on the efficiency,so as to optimize the structure and improve the efficiency of sand carrying,has an important guiding role and practical significance in practical engineering.This dissertation combines the subject of Dongying Haitian Petroleum Technology Co.,Ltd."Dual-pipe Water Jet Carrying Sand-carrying Blockage Removal and Efficiency Technology Research".Aiming at the on-site situation of Gudao Oil Production Plant in Shengli Oilfield,Dongying City,a new sand-carrying equipment double-pipe water jet pump Technology research.The main research content and results of the dissertation are:1.This article refers to the working principle of the traditional jet pump,combined with the actual well conditions of the oil field,designed a double-tube water jet sand-carrying pump.This jet pump avoids the shortcomings of traditional jet pump casings that are not under pressure.The annulus between the pipes is used as the power fluid input pipe to prevent the inner pipe from being buried by sand.The special flow channel of the nozzle is designed to well isolate the power fluid and the output fluid at the nozzle,and realize the function of connecting the power fluid and the output fluid above the nozzle.The research on the basic characteristics of the double-pipe water jet sand-carrying pump is improved.Based on the previous work,the pressure ratio and efficiency calculation formula of the pump is derived,which provides a basis for the optimization of the parameter structure of the jet pump.The working characteristics of the dual-tube water jet sand-carrying pump are described by non-dimensional parameters,the non-dimensional parameters are defined,and the basic characteristic equation is derived from the non-dimensional parameters,and the energy efficiency equation of the dual-tube water jet sand-carrying pump is obtained.2.Based on the Euler model,carry out the numerical analysis of the flow field of the solid-liquid two-phase flow of the double-pipe water-jet sand-carrying pump.According to the actual production situation and well conditions,the three-dimensional model of the jet-sand-carrying pump is established,and the calculation grid is divided With the setting of boundary conditions,according to the CFD simulation results,the flow mechanism of the internal flow field of the jet sand carrying pump is studied in detail,and the key parameters affecting the sand carrying performance and efficiency are analyzed.3.FLUENT is used to simulate the flow field of the throat nozzle based on the Euler model,and the nozzle structure and pressure inlet are optimized.Numerical simulation results analyze the maximum negative pressure and outlet velocity of the fluid under different pressures and different nozzle contraction angles.The influence of the sand-carrying effect of different nozzle shrinkage angles is analyzed through the sand volume distribution cloud chart.The optimal nozzle contraction angle is determined to be 20°.4.Improve the model structure,use FLUENT to explore the influence of the throat length,the angle of the diffuser,and the diameter of the sand particles in the flow field on the working efficiency and energy efficiency of the double-pipe water jet carrying sand pump,and the orthogonal design is designed.In the experiment,the difference and variance of work efficiency and energy efficiency were analyzed separately,and the order of the three factors on the work efficiency and energy efficiency of the double-pipe water jet pump was obtained under different conditions.According to the results of the range analysis,in the work efficiency,the angle of the diffuser has the greatest influence on the work efficiency,followed by the sand diameter,and the throat length is the weakest.In energy efficiency,sand diameter has the greatest impact on energy efficiency,followed by diffuser angle,and throat length is the weakest.Work efficiency and energy efficiency show opposite results.In the flow field,the pressure ratio P and the flow ratio M are analyzed by extreme difference.The results show that the sand particle diameter has the greatest influence on P and M,followed by the throat length,and the throat angle is the weakest.In the length of the throat,M gets the maximum when the throat is 40 mm,and the maximum for P when 45 mm.5.Designed the simulation test and production test plan of the jet-carrying sand pump,explored the influence of the distance between the nozzle and the throat on the pump efficiency,and added a diffuser to verify the influence of the diffuser on the pump efficiency.6.According to the well condition,a suitable size double-tube water jet sand carrying pump was used,and a low-liquid well was selected for field test.The normal liquid production of this well was 20m3/d in the early stage,and the production decreased to 5.94m3/d in the later stage.,As a whole,the fluid production volume increases with the increase of power fluid pressure.The test results show that the liquid production of the sediment mixture meets the expected expectation.After the sand is discharged and the well is opened again,the daily liquid production reaches 23m3/d after the production is stable,achieving the test purpose. |
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