Study On Well Pattern Optimization Of North Tluwa Carbonate Reservoir

Carbonate reservoirs play an important role in global oil and gas fields because of their high production characteristics.According to statistics,their oil and gas reserves are about 50% of the global total reserves,and their production accounts for about 60%of the world's total production.The seven oil wells currently recognized worldwide with daily production above 10,000 tons are mainly carbonate reservoirs,and their status is self-evident.This paper takes the North Tluwa carbonate reservoir in the important overseas block of Petroleum China as the research object.According to the current well pattern,after studying the geological characteristics and fluid characteristics of the typical reservoir,the reservoir is extracted.Based on the basic data,two actual geological models of pore type and fracture-pore type were established by using Petrel.After the feasibility analysis,four types of 16 kinds of transfer,encryption and transfer well network transformations were carried out.Optimization plan:(1)existing well network adjustment is no encryption scheme(2)internal encryption oil well scheme(3)boundary encryption oil well scheme(4)boundary encryption water well scheme.The results show that for the pore-type reservoir,the original corner well is transferred first,and the four wells are internally encrypted to form a small anti-9-point well pattern with an injection-production ratio of 1:3,that is,the scheme 8 is produced for 10 years,and then the side well is transferred.The formation of a small five-point well network,that is,the production of scheme 7 for 20 years is the optimal solution;for the fracture-porosity reservoir,the scheme 8 small anti-9 point well network is the optimal solution.The research on the well network optimization scheme of the North Tluwa carbonate reservoir in the paper has certain theoretical guiding significance for the actual development scheme design.