Study On Flow Assisted Lifting With Casing Gas Technology For High Liquid Gas Ratio Well

In the productive process of high gas liquid ratio well,the influence of gas leads to low oil production.As the gas occupies a large amount of effective space in the oil pump,the pumping efficiency of the oil pump is reduced,and the efficiency of the pumping system is reduced,which results in the failure of the oil well to operate normally.How to reduce the influence of gas and make use of the energy of gas is very important for the production of high gas liquid ratio well.In this paper,on the basis of investigating the correlation study sufficiently,the calculation method of wellbore pressure in common multiphase flow is evaluated.According to the high gas-liquid ratio,the Beggs-Brill method is used to calculate the gas-liquid two-phase flow,in order to stabilize and design the system,the annulus pressure is calculated.The reasonable use of down-hole tools is the most effective way to reduce the influence of gas.According to the study of the separation mechanism and working principle of different types of gas anchors,the application of various air-anchors is provided.An gas lift valve is an intelligent valve used to regulate down-hole pressure.This is to reduce the starting pressure and the empty gas from the oil ring to help lift the fluid in the tubing.The mechanism analysis of gas lift valve provides reference for the rationality of flow assisted lifting.In consideration of the advantages of high gas liquid ratio,a method,which is called flow assisted lifting,is presented to deal with high gas liquid ratio and low pumping efficiency by means of gas and oil separation and then guiding them to the tubing.The mechanism for improving the pumping efficiency with the technique is analyzed.Design procedures are proposed for the lifting string of flow assisted lifting.and perfected the flow assisted lifting design scheme.Using the VB 6.0programming language,suitable for the preparation of casing gas flow assisted lifting technology comprehensive evaluation program,and combined with the example calculation,the sensitivity analysis of various work parameters is carried out,and the optimum flow aiding lifting scheme of high gas liquid ratio well is obtained.