Tarim Condensate Gas Reservoir Recoverable Reserves Calculation Method And Application Research

The exploration and development of condensate gas reservoirs have always been highly valued by people.However,in actual production,the calculation of the recoverable reserves of condensate gas reservoirs has the problem that it is difficult to select the recoverable reserves calculation method and the low reliability of the calculation results.This paper selects different types of and representative condensate gas reservoirs and gas wells in the Tarim Kekeya,Yaha,Jilake and Yingmaili condensate gas fields as the main research objects,and by consulting domestic and foreign related books and literatures,comprehensively uses oil and gas reservoir projects theoretical knowledge and related software,combined with geological data and production data of various gas fields in Tarim,the corresponding results mainly as follows:(1)Summarize the geological characteristics and development condition of the condensate fields of Tarim Kekeya,Yaha,Jilake and Yingmaili,and according to the gas condensate content,structural characteristics,contact relationships,temperature and pressure systems,and exploration methods,secclt four different types and representative condensate gas reservoirs as research objects about recoverable reserves calculation method.(2)According to the difference between the properties of condensate gas and conventional natural gas,a method for calculating the fluid property parameters was selected through example calculation,which was provided to determine conveniently and effectively the abandoned conditions of the condensate gas reservoir and the calculation of recoverable reserves.(3)Comprehensive determination of abandoned conditions of condensate gas reservoirs.1)Initially determine the abandoned pressure of condensate gas reservoirs by using the condensate gas reservoir type estimation method and the burial depth empirical formula method.2)According to different types of condensate gas reservoirs,select suitable methods for further inspection and determination abandoned conditions from the pressure-production reduction method,gas well liquid-critical production method,and cyclic gas injection condensate gas storage condition analysis method.(4)According to the type characteristics of condensate gas reservoirs,corresponding methods are used to calculate the recoverable reserves of gas reservoirs and some calculation methods of recoverable reserves are perfected.Through the theoretical analysis of the HCZ prediction model method and the Hubert prediction model method,the production time of the prediction model method is revised to the production time limit of the gas reservoir development plan or the production time when the gas reservoir is abandoned,and a more realistic prediction is obtained.result.Combining with the example calculations,the relationship between the selection of production data and the prediction results is explored,and the application conditions of the prediction model method and the detection methods of the prediction results are summarized.From the point of view of condensate production,the ultimate content of condensate is calculated by using the condensate oil content limit method for the extremely high condensate oil content condensate gas reservoir,and the condensate oil content limit content method is completed.By using mathematical methods it is proved that using the same set of production data,the error of A-type water flooding characteristic curve is smaller than the B-type water flooding characteristic curve predicted recoverable reserve.In this paper,using the method of example calculation combined with theoretical analysis,the static and dynamic methods are used to calculate the recoverable reserves of condensate gas reservoirs,and the various recoverable reserves calculation methods were analyzed and evaluated in the application.By summarizing application conditions,applicable object,the cause of the error,and the data selection method of each method.Finally,the recoverable reserves calculation methods for a typical condensate gas reservoir of Tarim are selected.The research in this paper has certain guiding significance for the calculation of the recoverable reserves of the condensate gas reservoir in Tarim and the application of calculation methods.