One-well multi-control method for offshore low-permeability reservoir thick oil layer exploitation

Abstract

The invention relates to a one-well multi-control method for an offshore low-permeability reservoir single relatively thick oil layer. The method at least uses a long section horizontal well and a plurality of artificial fractures located between an oil layer top and an oil layer bottom, wherein the extension direction of a well section of the horizontal well is the maximum principal stress direction of a stratum; the artificial fracture surfaces are vertical to the horizontal well section and extend along the minor principal stress direction; injection and recovery are carried out simultaneously by implementing an offshore same-well injection and recovery technology in the horizontal well; injection water is firstly injected into the artificial fracture at the farthest end from the root of the horizontal well section; the injection water drives crude oil to enter the closest artificial fracture to enter a wellbore so as to be recovered; and when the far end artificial fractures are flooded by water in succession and water plugging is invalid, conversion is carried out in sequence from a far end to a close end. According to the method, the well building cost is reduced; the injection effect is improved; the distance between adjacent artificial fractures is adjusted, so that the small-well-distance water injection is realized, the displacement pressure gradient is favorably built, the start pressure difference is overcome, and the oil recovery effect is increased.

Description

technical field [0001] The invention relates to a multi-control method for one well in the development of thick oil layers in offshore low-permeability oil reservoirs. Background technique [0002] Since offshore oil and gas fields are located in a marine environment, production facilities and production wells need to be concentrated on offshore production platforms or wellhead platforms. Due to the constraints of platform construction and huge investment in drilling, offshore oil and gas fields can only be developed with a limited number of wells. The degree of recovery, rate of oil recovery and economy are limited to a certain extent. [0003] When developing offshore low-permeability reservoirs, due to poor reservoir permeability, it is more difficult for oil and gas to flow underground, and there are fewer exploitable oil and gas resources within the control range of a well, while offshore oil and gas fields cannot be utilized due to facilities and investment restriction...

AI Technical Summary

Problems solved by technology

[0002] Since offshore oil and gas fields are located in a marine environment, production facilities and production wells need to be concentrated on offshore production platforms or wellhead platforms. Due to the constraints of platform construction and huge investment in drilling, offshore oil and gas fields can only be developed with a limited number of wells. The degree of recovery, rate of oil recovery and economy are limited to a certain extent

[0003] When developing offshore low-permeability reservoirs, due to poor reservoir permeability, it is more difficult for oil and gas to flow underground, and there are fewer exploitable oil and gas resources within the control range of a well, while offshore oil and gas fields cannot be utilized due to facilities and investment restrictions The method of drilling multiple production wells and water injection wells in onshore low-permeability oilfields to change

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