Same-well production technique column for low-permeation horizontal well

Abstract

The invention relates to a low-permeability horizontal well identical-well injection-production technique pipe column. The pipe column comprises an oil pipe column, a pump, a bridge packer A, a bridge packer B, an inner pipe, a bridge dividing valve and an injection allocator; and the pipe is characterized in that the pump, the bridge packer A, the bridge dividing valve, the bridge packer B and the injection allocator are arranged and connected at an oil pipe in sequence; the inner pipe is arranged in the oil pipe, the middle part thereof is connected with the bridge dividing valve, and the two ends thereof are connected with the bridge packer A and the bridge packer B. The invention is characterized in that the developing cost can be reduced, the investment is less, the return is obtained quick, the construction is convenient, identical-layer injection-production distance can be regulated flexibly, the water-injection pressure loss can be reduced, the injection-production corresponding rate can be improved, the augmented-injection requirement of the low-permeability horizontal well can be met, the stabilized production period of the low-permeability horizontal well can be prolonged, and the extraction percentage of the low-permeability reservoir can be improved. Therefore, the invention is applied widely in the injection-production technique of oil production.

Description

1. Technical field [0001] The invention relates to a downhole pipe string for water injection in oil production, in particular to a low permeability horizontal well same well production and injection technology pipe string. 2. Background technology [0002] The traditional oil production water injection downhole pipe string is generally a special independent oil production well production pipe string, and the water injection well is the water injection pipe string. The water injection pipe string of the water injection well is fashionable to inject water, and the water injection station must prepare special water injection pipes and water injection pumps to inject water into the formation. It is a necessary equipment for oil exploitation to supplement formation energy and increase oil production. Its shortcomings or deficiencies are: ①Complicated facilities, such as water injection wells must be equipped with water storage tanks, water injection pump stations, water injection...

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Problems solved by technology

[0002] The traditional oil production water injection downhole pipe string is generally a special independent oil production well production pipe string, and the water injection well is the water injection pipe string. The water injection pipe string of the water injection well is fashionable to inject water, and the water injection station must prepare special water injection pipes and water injection pumps to inject water into the formation. It is a necessary equipment for oil exploitation to supplement formation energy and increase oil production. Its shortcomings or deficiencies are: ①Complicated facilities, such as water injection wells must be equipped with water storage tanks, water injection pump stations, water injection processes, and filtration and other auxiliary equipment; ② Large investment, long period, high cost, slow effect, especially for sewage reinjection, a complete set of sewage reinjection treatment facilities is required, and the cost will be even higher; Water injection is a big problem

There is an injection-production string in the same well, which is composed of sand filter pipe, well washing device, cup packer, screen pipe, electric submersible pump, etc., but it is used in a vertical well, and the water layer in the same well Medium production water, injected into the production layer, therefore, it cannot be used in horizontal wells, and it is more difficult to use in low permeability horizontal wells

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