The Study On Development Potential Evaluation & Countermeasure Research In Bai-55 Faultblock Condensate Gas Reservoir

This thesis focused on the problem of low recovery degree and poor development response at Bai55 fault-block condensate gas reservoir.The performance analysis and well test interpretation method was used to analyz the cause of gas well production decline rapidly and evaluate the retrograde condensation of gas well.Combined with practical production data,evaluated the gas reservoir potential scale and the exploration direction.As to the existent problems,this thesis propose the development countermeasures and analyzed the applicability.Combined with the distribution feature of remaining reserves,maked the gas reservoir measurement of further exploitation.The numerical simulation method was used to optimization parameters and predict development index.By using the economic benefit analysis,evaluated of the economic feasibility of the exploitation measurement and provided an important basis for guiding gas reservoir management.The main results and understanding are as follows:(1)Through the study of sedimentary microfacies and reservoir characteristics,this thesis recalculated the geological reserves of gas reservoir.Modern production decline analysis method was used to study calculating control reserve of single well and well-net control degree.Evaluated the gas reservoir potential and distribution of remaining reserves.Research shows that the distribution of remaining reserves has a large difference at reservoirs.ES3 Z is the main further developing object.(2)The gas well production dynamic analysis method was used to clear out the problem during the process of gas production.Using the transient well test analysis method to evaluate the retrograde condensation pollution condition of gas well.Combined with the fuzzy evaluation theory,Established the Bai-55 block retrograde condensation pollution evaluation method of condensate gas wells.Studies show that gas wells has existed a widespread retrograde condensation pollution phenomenon.It is the important reasons that short plateau production period and fast production decline of gas wells.(3)In view of the retrograde condensation pollution problems,this thesis puts forward the fracturing,gas injection huff and puff,deployment of horizontal wells measure to improve the gas well production and the development effect of gas reservoir.The gas reservoir numerical simulation method was used to optimize the horizontal well parameters and reasonable well pattern.Study shows that horizontal well technology enable to restrain the reservoir near wellbore area of retrograde condensation phenomenon and provide an important basis for gas reservoir exploration scheme.(4)Through research on ES3 Z remaining reserves distribution characteristics,this thesis puts forward the measurement of further exploitation which used of well pattern infilling,system adjustment and well stimulation.The numerical simulation method was used to predict the technical index of further exploitation scheme.The economic benefit analysis method was used to evaluate the economic feasibility of the scheme.This thesis study achievement provided a solution for Bai-55 fault block condensate gas reservoir at comprehensive treatment and exploiting potentialities.The result has guide meaning for the efficient development of condensate gas reservoir.