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Sewage reinjection well and water injection method of sewage reinjection well

A technology for reinjecting wells and sewage, which is applied in wellbore/well components, drilling equipment, earthwork drilling and production, etc. It can solve problems such as tubing corrosion, limited injection volume, and small tubing inner diameter

Inactive Publication Date: 2014-08-06
CNPC BOHAI DRILLING ENG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, the oil pipe is used to inject water, but because the sewage contains corrosive substances, it will cause serious corrosion to the oil pipe. In less than two years, the oil pipe will have different degrees of corrosion and perforation, which will affect the normal water injection. The water pump pressure is high and the injection volume is limited, resulting in waste of power on the ground

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  • Sewage reinjection well and water injection method of sewage reinjection well

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Embodiment Construction

[0009] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0010] Such as figure 1 As shown, in the sewage reinjection well according to the embodiment of the present invention, an anti-corrosion casing 1 for water injection is fixedly installed in the well, the inner wall of the anti-corrosion casing 1 is coated with an anti-corrosion layer 2, and the lower end of the anti-corrosion casing 1 extends to the water injection layer, and the cement of the anti-corrosion casing 1 is returned to the wellhead 3.

[0011] Among them, 4 is the cement layer of the anti-corrosion casing, 5 is the casing of the original technology, and 6 is the artificial well bottom.

[0012] In this technical solution, the material of the anticorrosion la...

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Abstract

The invention provides a sewage reinjection well. A corrosion-resisting casing pipe used for injecting water is fixedly installed in the well, and the inner wall of the corrosion-resisting casing pipe is coated with a corrosion-resisting coating. The lower end of the corrosion-resisting casing pipe extends to the water injection layer, and cement of the corrosion-resisting casing pipe extends to a well mouth. The invention further provides a water injection method of the sewage reinjection well. By means of the sewage reinjection well and the water injection method of the sewage reinjection well, an oil pipe can be prevented from being corroded after water is injected, and therefore cost is reduced; in addition, the water injection efficiency can be improved, and power consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of water injection for sewage reinjection wells, in particular to a sewage reinjection well and a water injection method for sewage reinjection wells. Background technique [0002] As oilfield development enters the middle and later stages, the water content of oil well production has increased significantly, resulting in an increase in the amount of sewage that needs to be reinjected. At present, the oil pipe is used to inject water, but because the sewage contains corrosive substances, it will cause serious corrosion to the oil pipe. In less than two years, the oil pipe will have different degrees of corrosion and perforation, which will affect the normal water injection. The pump pressure is high and the injection volume is limited, resulting in waste of power on the ground. [0003] Therefore, a new solution is needed, which can avoid corrosion of oil pipe water injection, thereby reducing costs, and ca...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B17/00
Inventor 吴德孙海林富玉海白田增董连刚刘英杰
Owner CNPC BOHAI DRILLING ENG
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