Application Of Indicator Diagram And Fluid Level In Oil Well Production

With the gradual increase of oil well production time,the downhole production status is changing constantly.Practical production problems often encountered in the field,such as the formation energy decline resulting in insufficient fluid supply capacity,resulting in a decrease in well production;The failure of the deep well pump caused by long-term wear and stretching of the downhole string of the rod production system resulted in the production of the well;The mismatching of injection-production relationship or the unreasonable setting of pumping parameters and working system restrict the production potential of oil Wells affect the development effect of oil fields to a certain extent.The indicator diagram and fluid level are the two most commonly used data to reflect the production performance of oil well.As a graph reflecting the interaction and relationship between the suspension point load and the suspension point displacement,the indicator diagram has the advantage of showing the work state of the deep well pump intuitively;As the expression of liquid height in annular space of oil jacket,moving liquid level can reflect the liquid supply capacity of perforated formation.The organic combination analysis and application of the above two test data can provide accurate and reliable judgment results of downhole conditions for oil production,and at the same time serve as the basis of oilfield development effect to point out the direction of subsequent production dynamic adjustment.This paper analyzes the correlation and degree of correlation between dynamic fluid level and dynamic parameters such as suspension point load,pump efficiency and daily production of oil well,The mathematical model of intermittent production of oil well is established by using the production dynamics reflected by indicator diagram and moving fluid level,The accuracy of the application of the model is confirmed after comparing with the results of the interval time obtained by using the digital platform monitoring system and manual testing of the other two methods.It is found that the pump efficiency is improved after selecting typical oil Wells in Triassic and Jurassic,production per well did not decrease with the implementation of the gap system.according to different daily production intervals of oil Wells,the interval time suitable for actual production is calculated.In the aspect of dynamic fluid level calculation,the result of dynamic fluid level calculation by theoretical indicator diagram is quite different from the measured one,this is because the influence of inertia,friction and other factors on the load is not considered,resulting in a large error of the calculation results and poor applicability.However,the result of calculating the dynamic fluid level of an oil well with 0 casing pressure by using the static load at the hanging point is ideal,and the error is about 10-15%,Although the process of obtaining and calculating some parameters is complicated and the casing pressure is not considered,it still has certain adaptability to oil production site.Finally,Yan₈ layers of Jurassic Y267 reservoir were selected in the study area,by using the indicator diagram and fluid level to select low production and low efficiency Wells with poor production status,summarize the regional geological characteristics of low production and low efficiency and analyze the causes of low production and low efficiency Wells,it is concluded that the reservoir is easy to be blocked due to the poor physical property and high mud content;the contradiction between reservoir layers leads to the low utilization degree of water drive reserves;injection water inrush unidirectionally,so that injection water can be seen locally.Meanwhile,due to the push of reservoir edge water,it is more difficult for single well to increase water cut and stabilize production;it is recognized that the number of low production and low efficiency Wells increases rapidly due to a series of reasons such as low formation energy level and poor water flooding condition caused by natural energy exploitation in early stage of development.Aiming at the unfavorable situation of reservoir development mentioned above,the effects of injection and production pattern adjustment,oil production speed control,production parameter optimization,downhole measures to improve the effect of water injection are analyzed,the main development indexes of oil fields in low production and low efficiency areas can be improved or promoted after the above measures,through the increase of oil well production,the oilfield development effect is developed in a positive way and provides a reference for the follow-up development work.