Study On The Loading Diagnosis And Deliquification Technology For Low Water Production Gas Well

Combined with the dynamic production data analysis system of gas field, the water status and affect the whole field, analysis the Sebei gas field water history is divided into three stages, respectively, stable effluent and water condensate water period, a period of rapid growth, is currently in a period of rapid growth. The water in the plane is mainly distributed in the edge of the structure, the northeast and northwest relatively serious; on the longitudinal main respectively in II, III, IV layer, the water is the most serious in III layer. The 48.6% decline in gas well productivity after water, the corresponding yield decreased 5-47% amplitude, average output fell 21.88%, water effect is very serious.Mutual authentication effusion diagnosis method by comprehensive analysis of critical flow analysis, oil pressure differential judgement, prediction of tubing effusion, deliverability analysis of gas wells, the experience of experts and other innovative analysis, establishes the diagnosis method of multi factors of liquid loading in gas wells, the accuracy can reach 95.77%. For the wells have been effusion, based on analyzing the current problems of the calculation model, calculation model for the establishment of a new fluid volume, greatly improve the prediction accuracy, through the comparison with the measured data, the oil pipe liquid level position average error rate is 5.59%, annulus liquid level position of the average error rate of 4.31%. In order to facilitate the research and field application of multi factor clinical diagnosis and the amount of fluid prediction technology, computer software development, popularization and application in the Sebei gas field, the effect is good.In view of the foaming agent evaluation equipment cannot load pressure, environmental evaluation and field far problem, establish a new evaluation device, evaluation of temperature: room temperature of-200 DEG C, the pressure: the atmospheric pressure-25 MPa, provide analysis and test method of exhaust development and evaluation for high performance foaming agent, based on the new evaluation equipment. The method, using the zwitterionic surfactant and anionic surface active agent, developed a high salt tolerance of foaming agent, high salinity can reach 250000mg/L, the foamability, stability, liquid carrying are greatly superior to the scene in the foaming agent.Combining the characteristics of the water in Sebei gas field, analysis of 14 kinds of water drainage and gas production in the Sebei gas field adaptability, recommend the Sebei gas field of the main drainage gas recovery technology for foam drainage; innovation developed the control chart method of gas outlet situation choose different drainage gas recovery wells, 500 wells in the recommended drainage gas recovery methods; combined with the gas field production distribution plan, clear boundaries of mass into a drainage gas recovery technology of different strata, provides the necessary basis for the field of management decision;The formation of efficient drainage gas recovery technology was applied in Sebei gas field, effectively reduce the influence of water on the gas well production. The high salt, anti foaming agent used in 112 wells,optimization design used in 179 wells, test the effective rate reached 94%, achieved remarkable results, has become the one of the main technology in Sebei gas field.