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CO* flooding single string multi-zone separate injection technical string

A process pipe string, CO2 technology, applied in drilling pipe, casing, production fluid and other directions, can solve the problems of low injection efficiency, poor corrosion resistance, prominent contradiction between layers, etc., to achieve low pipe string cost and simple construction process , The effect of reliable sealing performance of the pipe string

Inactive Publication Date: 2010-02-10
DAQING OILFIELD CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Due to the difference in permeability of the formation, some layers cannot be injected, the contradiction between layers is prominent, and the injection efficiency is not high
However, the injection string currently used in oilfields is a single-layer injection string, which can only achieve single-well single-layer injection. At the same time, the injection string still has many problems such as poor sealing effect and poor corrosion resistance, which cannot meet production needs.

Method used

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  • CO* flooding single string multi-zone separate injection technical string

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Embodiment Construction

[0009] As shown in the accompanying drawings, the present invention includes an oil pipe 1 and a casing 2, and the oil pipe 1 is placed in the casing 2, and it also includes an alternate injection regulator 3, a packer 4 and a dispenser 5, wherein the lower end of the oil pipe 1 is sequentially Connect alternate injection regulator 3, packer 4, and injector 5, connect multiple unit bodies composed of packer 4 and injector 5 under injector 5, and inject regulator 3, packer 5 alternately Both the device 4 and the dispenser 5 are connected by oil pipes.

[0010] Packer 3 is a drillable Y443 type. The tubing 2 is treated with a nickel-phosphorous coating.

[0011] During on-site construction, when the tubing string is lowered to the predetermined position in the casing, the tubing 1 is pressed to 15-20MPa, and the packer 4 is equipped with a hydraulic setting system to compress the rubber cartridge, and the multi-stage packer 4 is completed in one trip. For setting, the injector...

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Abstract

The invention relates to the technical field of oilfield tertiary oil recovery and belongs to a CO2 flooding single string multi-zone separate injection downhole technical string. The invention provides the technical string which can realize CO2 multi-zone separate injection under the condition of a set of injection pipe network on the ground and has good sealing effect and CO2 corrosion resistance. The technical string mainly comprises a regulator 3 for alternating injection, a packer 4 and an injection allocator 5, wherein, the lower end of an oil pipe 1 is sequentially connected with the regulator 3 for alternating injection, the packer 4 and the injection allocator 5, and a plurality of unit bodies which are formed by connecting the packer 4 and the injection allocator 5 are connectedbelow the injection allocator 5. The technical string is used for carrying out the downhole multi-zone separation injection and has the advantages of simple construction technology, low cost of the string, reliable sealing performance of the string, CO2 corrosion resistance and the like.

Description

Technical field: [0001] The invention relates to the technical field of oil field tertiary oil recovery, and belongs to a CO 2 Flooding single-pipe multi-layer separate injection downhole process string. Background technique: [0002] Daqing Oilfield CO 2 Injection wells in oil flooding blocks are suitable for CO injection 2 There are 3-5 layers in the stratum, and the injection method is general injection. Due to the difference in permeability of the formation, some layers cannot be injected, the contradiction between layers is prominent, and the injection efficiency is not high. At present, the injection string used in the oil field is a single-layer injection string, which can only achieve single-well single-layer injection. At the same time, the injection string also has many problems such as poor sealing effect and poor corrosion resistance, which cannot meet the production needs. Invention content: [0003] The purpose of the present invention is to provide a met...

Claims

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Application Information

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IPC IPC(8): E21B17/00E21B43/18
Inventor 刘合周万富张书进王金友潘卫国王浩赵骊川
Owner DAQING OILFIELD CO LTD
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