Research On The Influence Of Logging Permeability Parameters On The Plunger Gas Lift System Of Low-pressure Gas Wells

The plunger gas lift is the use of the energy of formation gas production,through the periodic switch on the gas well,so that the plunger can circulate in and out of the tubing and drain the bottomhole effusion.The purpose is to reduce back pressure on the production layer,improve the gas production power and prolong the production life of the gas well.But the periodic operation of plunger gas lift is not only related to its own plunger technology,but also related to its gas production capacity and geological conditions.Therefore,we have completed the following work combining logging permeability parameters and plunger gas lift technology.(1)Based on the mass balance equation and Newton's second law,based on the gas balance equation,the dynamic simulation of the upstream ascending stage,the gas releasing stage and the shut in repressurized stage of the plunger gas lift cycle in the low pressure gas well is carried out,and the change models of the oil pressure at each stage are established.(2)Taking the instantaneous gas production power as the research object,based on the gas well productivity formula proposed by Mr.Li Shilun,we built a bridge between geological parameters and the plunger gas lift technology.(3)Taking two wells in Sulige X block as an example,we calculated and illustrated the relationship between gas production rate,oil pressure and casing pressure in two low production gas wells during a plunger cycle.The relationship between velocity and acceleration and displacement of two wells during the uplink process is discussed in detail,which provides a theoretical basis for optimizing the technological process of plunger gas lift under different geological conditions.(4)Two wells in Sulige X block were compared according to the increase of production rate during the cycle,the change of oil pressure in the upstream stage,the motion parameters at the upstream stage,and the recovery rate of oil casing pressure during the shut in recovery stage.(5)The position of the well to the well head of the Su X-3-11 well is about 1680s,the error value is 6.9%,and the time of the well head position of the Su X-3-12 well is about 1200s and the error value is 8.8%.The combination of research results and field data shows that the established dynamic model has small error value,and the result is reliable.It can be popularized in the corresponding blocks according to the actual situation.