Designing method for selective water plugging slug of fault-solution oil reservoir

Abstract

The invention provides a method for designing a selective water plugging slug of a broken solution reservoir, which comprises the following steps of: injecting a front slug thixotropic gel system into a stratum to plug a deep source water outlet channel of the broken solution reservoir; injecting the first main body slug oil-soluble adhesive particle system into a stratum, and selectively plugging a middle water channeling channel of the broken-solution oil reservoir; then injecting a second main body slug dilution-resistant gel system into the stratum, and selectively plugging a water outlet channel around the well; and finally, the corresponding slugs are compacted in the stratum by injecting the displacement slug formation water into the stratum. According to the method, a multi-slug combination and selective plugging design is adopted from bottom to top, a deep source water outlet channel and a water channeling dominant channel can be more effectively plugged, remaining oil of a secondary channel is released, the problem that water plugging is low in efficiency and ineffective can be effectively solved, and support is provided for efficient development of a fault-solution oil reservoir.

Description

technical field [0001] The invention relates to the technical field of petroleum development, in particular to a design method for selective water shutoff slugs in fault-karst reservoirs, which is suitable for the technology of water shutoff and enhanced oil recovery in fault-karst reservoirs. Background technique [0002] Carbonate fault-karst body reservoirs are effective oil and gas traps formed by fault zones in carbonate rock formations, formed by deep and large faults reformed by multi-stage karstification and various structures derived from them. Production accounts for 60% of the world's total oil and gas production. Poor matrix storage and seepage capacity, strong reservoir heterogeneity, and complex oil-water relationship lead to many difficulties in the development of this type of reservoir. However, with the deepening of oilfield development, the formation pressure continues to decrease, the number of high water-cut wells gradually increases, the water injection...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem of poor effect of water shutoff and oil increase in fault-karst reservoirs in the prior art, the present invention provides a design method for selective water shutoff slugs in fault-karst reservoirs. The pre-slug thixotropic gel system is designed, the first The main slug oil-soluble adhesion particle system, the second main slug anti-dilution jelly system and the replacement slug formation water adopt a bottom-up, multi-slug combination and selective plugging design, which can more effectively seal deep sources Blocking the water outlet channel and the dominant channel of water channeling and releasing the remaining oil in the secondary channel can effectively solve the problem of ineffective water plugging and provide support for the efficient development of fault-karst reservoirs

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