CN201245707Y

CN201245707Y - Oil pipe anti-corrosive device

Info

Publication number: CN201245707Y
Application number: CNU2008200248581U
Authority: CN
Inventors: 马力
Original assignee: Dongying Kaiwei Petroleum Science & Technology Co Ltd
Current assignee: Dongying Kaiwei Petroleum Science & Technology Co Ltd
Priority date: 2008-06-30
Filing date: 2008-06-30
Publication date: 2009-05-27
Anticipated expiration: 2018-06-30

Abstract

The utility model relates to anticorrosive equipment for an oil pipe, in particular to an anticorrosive device for an oil pipe. The utility model adopts the technical proposal that the anticorrosive device mainly comprises an upper connector, an outer casing, an alloy pipe, an inner pipe and a lower connector, wherein, alloy layers are arranged on the inner surface and on the outer surface of the alloy pipe; the upper connector and the lower connector are connected with two ends of the alloy pipe respectively; the outer casing is arranged outside the alloy pipe; the inner pipe is arranged on the inner layer of the alloy pipe; and a plurality of through holes are arranged on the outer casing and on the pipe wall of the inner pipe. The anticorrosive device has the advantages that the oil pipe is replaced by adopting the alloy pipe with active metal on the surface, and the active metal is used to act as an anode of the macroscopic primary battery in the electrochemical corrosion; therefore, in the electrolyte consisting of injected water, the more active metal acts as the anode to be corroded, while the oil pipe and the sleeve pipe act as the cathode to avoid the corrosion and to be protected, thereby effectively prolonging the service life of the oil pipe, reducing operation times, reducing manufacturing cost and improving economic efficiency.

Description

The oil pipe anti-corrosive device

One, technical field:

The utility model relates to a kind of oil pipe anti-corrosive apparatus, particularly relates to a kind of oil pipe anti-corrosive device.

Two, background technology:

The overwhelming majority oil district in oil field has all entered the high moisture or ultra-high water-containing development phase at present, has increased crude production rate with water displacing oil, but has but worsened the environment that exists of oil pipe, sleeve pipe and subsurface tool.Because oil-field development is injected water in producing, mostly be that stratum output water carries out re-injection after treatment, and the very high strong electrolyte that belongs to of formation water salinity, all has stronger galvanic corrosion effect (particularly in the water injection well) for down-hole oil tube, sleeve pipe and subsurface tool, so shortened the working life of oil pipe etc. greatly, increase the operation number of times, improved production cost.

Three, summary of the invention:

The purpose of this utility model is exactly the above-mentioned defective that exists at prior art, and a kind of oil pipe anti-corrosive device is provided, and has increased the working life of oil pipe, has reduced the operation number of times, has reduced production cost.

Its technical scheme is: mainly be made up of top connection, overcoat, compo pipe, interior pipe and lower sub, the internal surface and the outside surface of compo pipe are provided with alloy layer, the two ends of compo pipe are connected with lower sub with top connection respectively, compo pipe is provided with overcoat outward, the internal layer of compo pipe is provided with interior pipe, and the tube wall of described overcoat and interior pipe is provided with a plurality of through holes.

Wherein, above-mentioned lower sub and compo pipe are by being threaded, and lower sub is outer to be fixed by plug, and plug is connected by surely following closely with overcoat.

Further scheme is: above-mentioned alloy layer is provided with the active metal, as zinc or aluminium etc.

The beneficial effects of the utility model are: the compo pipe that adopts the surface to be provided with the active metal substitutes oil pipe; the anode that serves as macroscopical galvanic cell in the galvanic corrosion; like this at the ionogen that constitutes by injection water; this exactly more active metal serves as anode and is corroded, and oil pipe and sleeve pipe avoid corrosion as negative electrode, and is protected; effectively increased the working life of oil pipe; reduce the operation number of times, reduced production cost, and improved economic benefit.

Four, description of drawings:

Accompanying drawing 1 is a structural representation of the present utility model.

Five, embodiment:

In conjunction with the accompanying drawings 1, the utility model will be further described:

Its technical scheme is: mainly be made up of top connection 1, overcoat 2, compo pipe 3, interior pipe 4, lower sub 5 and O shape rubber ring 6, lower sub 5 and compo pipe 3 are by being threaded, and lower sub is fixing by plug 8 outward, and plug 8 is connected by surely following closely 7 with overcoat 2.

The internal surface and the outside surface of compo pipe 3 are provided with alloy layer, by what be cast into than the more active metallic zinc of tubing material, aluminium etc., as zinc or aluminium etc., the two ends of compo pipe 3 are connected with lower sub 5 with top connection 1 respectively, the compo pipe 3 outer overcoats 2 that are provided with, pipe 4 in the internal layer of compo pipe is provided with, the tube wall of described overcoat 2 and interior pipe 4 is provided with a plurality of through holes 9, and well liquid can directly be contacted with alloy layer.

Its principle of work is in oil well and water injection well; oil pipe, sleeve pipe and well liquid (ionogen) have been formed macroscopical galvanic cell of galvanic corrosion; because constitute oil pipe different with the telescopic metallic substance (in general sleeve pipe is better than oil pipe); so at the strong electrolyte that constitutes by injection water; oil pipe is always by first corrosion; become the anode of this macroscopical galvanic cell, the protection oil pipe avoids corrosion, is the good plan that prolongs the water injection string life cycle.

When using at the scene, oil pipe and the utility model are together in series, in oil well, from about the about 50m of pump, begin to install, approximately every one of 150 connection, in the oil pipe lower going-into-well.(annotate: to be immersed in the liquid corrosion very fast because of oil well middle and lower part oil pipe, thus the bottom corrosion-preventing device time interval is installed can be near relatively, and that the top oil pipe is not immersed in the liquid corrosion is slower, therefore, the corrosion-preventing device time interval is installed can be far away relatively)

In water injection well since the end ball about about 50 meters locate to install, connect one every 150m approximately, in the oil pipe lower going-into-well.(annotate: can use the KW-I type, but also KW-II type and KW-III type are used alternatingly.Alloy layer on the corrosion-preventing device serves as the anode of galvanic cell in well like this, constantly be corroded, and oil pipe is protected as negative electrode, avoids corrosion, thereby prolongs its work-ing life greatly.

Claims

1, a kind of oil pipe anti-corrosive device, it is characterized in that: mainly form by top connection (1), overcoat (2), compo pipe (3), interior pipe (4) and lower sub (5), the internal surface and the outside surface of compo pipe (3) are provided with alloy layer, the two ends of compo pipe (3) are connected with lower sub (5) with top connection (1) respectively, the outer overcoat (2) that is provided with of compo pipe (3), the internal layer of compo pipe is provided with interior pipe (4), and the tube wall of described overcoat (2) and interior pipe (4) is provided with a plurality of through holes (9).

2, oil pipe anti-corrosive device according to claim 1 is characterized in that: described lower sub (5) and compo pipe (3) are by being threaded, and lower sub is fixing by plug (8) outward, and plug (8) is connected by surely following closely (7) with overcoat (2).

3, oil pipe anti-corrosive device according to claim 1 and 2, it is characterized in that: described alloy layer is provided with the active metal.

4, oil pipe anti-corrosive device according to claim 3 is characterized in that: described active metal is zinc or aluminium.