A method for simulating water cut produced by wells in fractured-vuggy reservoirs

Abstract

The invention discloses a method for simulating the water cut rate of oil well production in a fracture-cavity reservoir, which comprises the following steps: S1, first establishing the description structure and description parameters of multi-fracture-cavity unit reservoirs; S2, using the fracture-cavity units established in S1 Describe the structure and description parameters, combine the material balance relationship and water cut model of the elastic driving stage in the reservoir development process, use the elastic expansion energy as the virtual injection volume of the fracture-vuggy unit, and simulate and calculate the oil production and production rate of each fracture-vug unit stage. According to the water production, the oil production, water production and cumulative liquid production of the oil well are obtained; S3, finally, according to the obtained oil production, water production and cumulative liquid production of the oil well, the change of the water content of the oil well with the cumulative liquid production is calculated . The inventive method contributes a new idea to the dynamic water cut analysis and understanding of the fracture-cavity structure in the elastic driving stage of the fracture-cavity reservoir.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a method for simulating the output water cut of an oil well in a fracture-cavity reservoir. Background technique [0002] For carbonate fracture-cavity reservoirs, the storage and seepage spaces are dissolved pores, dissolved pores, and fractures. The fractures and caves have strong flow conductivity, and the caves are the main storage spaces. The oil-water gravity differentiation in the caves is significant, and fractures are the main The water cut rises rapidly after the oil well breaks through, the natural water flooding reserves are poorly produced, and the recovery factor is low. According to the production data, it is found that the multi-line form of the cumulative water-accumulative fluid curve of oil well production, such as figure 1 As shown, the water cut change of the oil well in the figure is divided into four stages a, b, c, and d, including two general...

AI Technical Summary

Problems solved by technology

[0002] For carbonate fracture-cavity reservoirs, the storage and seepage spaces are dissolved pores, dissolved pores, and fractures. The fractures and caves have strong flow conductivity, and the caves are the main storage spaces. The oil-water gravity differentiation in the caves is significant, and fractures are the main The water cut rises quickly after the oil well breaks through, the natural water flooding reserves are poorly developed, and the recovery factor is low

Images