Research on the application of intelligent plunger gas lift drainage technology
The development strata of Yan'an gasfield consist of tight sandstones from the Upper Paleozoic and marine carbonate rocks from the Lower Paleozoic.Gas reservoirs are generally known to contain water,and drainage for gas production is the most important mea-sure for stable production of the gasfield.A critical fluid carrying model correction calcula-tion method is proposed to address the difficult issues of analyzing fluid accumulation in gas wells,determining the timing of fluid accumulation,and optimizing the drainage method of gas wells,research on the application of intelligent plunger self optimization drainage pro-cess.We separately explored the influence of the pulling force coefficient CD on the coeffi-cient value α and calculated the critical liquid carrying capacity under different sizes of pro-duction pipe columns.By establishing a plunger wellbore fluid accumulation identification model,using edge control algorithm to predict pressure growth trend and comparing it with the gas volume index model during the opening stage,the optimal shut in time point can be determined.The final optimal coefficient α for the critical liquid carrying model is 1.85,and the corresponding drag coefficient CD is 1.15.The calculated values are in line with the ac-tual production performance of gas wells in the study block.At the same time,intelligent control algorithms can achieve timely and effective removal of wellbore fluid accumulation through liquid identification,self optimization,and significant drainage effects.Compared with the well opening and closing system formulated by a dedicated person,the daily gas production rate is 5%～8%,and the well opening rate is increased by 6%～11%compared to before.The research results show that intelligent control algorithms can effectively reduce personnel labor intensity,improve the efficiency of measures,and reduce manual parameter adjustment by at least 70%.They can achieve the best production state of gas wells through-out the entire life cycle,which is the future trend of digital gasfield development.
intelligent plungercritical liquid carrying modeledge control algorithmiden-tification of wellbore fluid accumulation
万方数据
维普
