CN214327891U - Anticorrosive device for casing - Google Patents
Anticorrosive device for casing Download PDFInfo
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- CN214327891U CN214327891U CN202120284577.5U CN202120284577U CN214327891U CN 214327891 U CN214327891 U CN 214327891U CN 202120284577 U CN202120284577 U CN 202120284577U CN 214327891 U CN214327891 U CN 214327891U
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Abstract
The utility model discloses a casing corrosion preventer, which comprises a central tube and an anode body; the real-time elastic contact mechanism is a radial telescopic elastic mechanism; the anode body and the real-time elastic contact mechanism are sleeved outside the central tube in a hollow mode, namely the anode body and the real-time elastic contact mechanism are insulated from the central tube. The utility model discloses improve present serious current situation of sleeve pipe corrosion, reached the effect of alleviating sleeve pipe corrosion.
Description
Technical Field
The utility model belongs to the technical field of the anticorrosive technique of oil well tubular column and specifically relates to a sleeve pipe corrosion inhibitor.
Background
The oil field is developed for many years, casing damage wells increase year by year, the casing pipe is seriously corroded under the action of the well entering liquid and formation water, when the casing pipe is corroded to a certain degree, breakage can occur, even the integral strength of the casing pipe is greatly reduced, deformation is generated, and normal production of the oil field is restricted.
Publication (bulletin) No.: CN207391558U, publication (public notice) day: 2018-05-22 provide an anti-corrosion sleeve, which comprises a sleeve, wherein a molten zinc anode is cast on the outer surface of the sleeve, and the length of the zinc anode in the axial direction is 500 mm. The zinc anodes are axially distributed at the front end, the middle end and the rear end of the sleeve, the zinc anodes at the front end are 1000mm away from the threads at the end part of the sleeve, and the zinc anodes at the rear end are 1000mm away from the coupling at the end part of the sleeve. The anti-corrosion sleeve pipes and the common sleeve pipes are connected at intervals to form a sleeve pipe string, and 1-4 sections of common sleeve pipes are connected between every two adjacent anti-corrosion sleeve pipes in series. The anticorrosion sleeve pipe and the arrangement scheme and application are characterized in that the zinc anode is directly cast on the outer surface of the sleeve pipe after being melted to manufacture the anticorrosion sleeve pipe. The zinc anode and the sleeve are in seamless close conductive connection, the anode provides stable continuous protection current, the anode failure phenomenon caused by uneven corrosion and crevice corrosion of the anode material is effectively reduced, and the service life of the anode is obviously prolonged.
Publication (bulletin) No.: CN110847826A, publication (public notice) day: 2020-02-28 discloses an anti-corrosion casing pipe column and a using method thereof, the pipe column can be a two-section casing pipe structure, the upper section is a common carbon steel casing pipe, an epoxy cold winding belt and a sacrificial anode are adopted to prevent external corrosion, the lower section is an anti-corrosion pipe casing pipe to prevent internal and external corrosion, and the middle is connected by an insulating short section to prevent galvanic corrosion among different casing pipe materials; also can be three-section type casing tubular column structure, promptly: the upper section and the lower section adopt common carbon steel sleeves, and epoxy cold winding belts and sacrificial anodes are adopted to prevent external corrosion; the middle section is a corrosion-resistant pipe material to prevent internal and external corrosion, and the upper and lower sections are connected by adopting an insulating short section to prevent galvanic corrosion among different sleeve materials; the structure adopts different materials according to different positions of the sleeve, so that the anti-corrosion effect is ensured, and the cost can be reduced to the maximum extent.
Publication (bulletin) No.: CN101397673A, publication (public notice) day: 2009-04-01 discloses a sleeve capable of preventing metal corrosion, which is designed into a sleeve anode by using the principle that an electrochemical sacrificial anode protects a cathode and using active metals such as zinc, lead, magnesium and the like as a sacrificial anode. The manufacturing method comprises the following steps: magnesium, aluminum or zinc metal blocks are heated and melted to form liquid, then shaft sleeve blanks are manufactured by a centrifugal casting or static casting method, after forming, heat preservation and slow cooling, demoulding is carried out, then machining is carried out, the rough blanks are processed into smooth revolution bodies to become sleeve anodes, the specific specifications are 4 ', 5(1 '/2), 7 ' and other specifications according to different well conditions, when the sleeve anodes are installed and put into a well, the sleeve anodes are loosely sleeved on the outer circle of the male buckle end of the sleeve and fixed by jackscrews, and one group is installed at intervals of 100 meters.
In a word, above technical scheme of the disclosed technology and the technical problem that will solve and the beneficial effect who produces all with the utility model discloses inequality, to the utility model discloses more technical problem and the beneficial effect that will solve, above open technical document all does not have the technological inspiration.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sleeve pipe corrosion inhibitor to the above-mentioned defect that prior art exists, improved the serious current situation of present sleeve pipe corrosion, reached the effect of alleviating sleeve pipe corrosion.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a casing corrosion preventer comprises a central tube and an anode body;
the real-time elastic contact mechanism is a radial telescopic elastic mechanism;
the anode body and the real-time elastic contact mechanism are sleeved outside the central tube in a hollow mode, namely the anode body and the real-time elastic contact mechanism are insulated from the central tube.
Further, the real-time elastic contact mechanism comprises a groove body, a telescopic block and a spring;
the tank body is sleeved outside the central pipe in an empty mode, namely, the inner wall of the tank body and the outer wall of the central pipe form an insulating space, and at least two grooves are uniformly formed in the outer wall of the tank body;
the telescopic block is arranged in the groove, and the inner wall of the telescopic block is provided with at least one blind hole;
the spring is arranged in the blind hole, namely the inner end of the spring props against the bottom of the groove, and the outer end of the spring props against the bottom of the blind hole.
Furthermore, the real-time elastic contact mechanism also comprises an upper fixed sleeve and a lower fixed sleeve;
the upper fixing sleeve is in threaded connection with the outer circumferential wall of the upper end of the groove body, and the inner wall of the lower end of the upper fixing sleeve forms radial limit on the outer wall of the upper end of the telescopic block;
the lower fixing sleeve is in threaded connection with the outer circumferential wall of the lower end of the groove body, and the inner wall of the upper end of the lower fixing sleeve forms radial limit on the outer wall of the lower end of the telescopic block.
Furthermore, the anode body is sleeved outside the central tube in a hollow mode, namely, the inner wall of the anode body and the outer wall of the central tube form an insulating space, an upper insulating pad is arranged at the upper end of the anode body, the lower end of the anode body is in contact with the upper end of the tank body, and a lower insulating pad is arranged on the lower end face of the tank body.
Furthermore, a sheath is sleeved on the outer wall of the anode body.
Furthermore, the upper insulating pad is axially limited on the lower end face of an outer convex ring platform arranged on the outer wall of the central tube.
Further, the lower end of the central tube is provided with a lower joint in a threaded mode, and the upper end of the central tube is provided with an upper joint in a threaded mode.
Furthermore, the outer wall of the upper end of the lower joint is provided with a locking sleeve in a threaded manner, and the upper end of the locking sleeve props against the lower insulating pad.
Compared with the prior art, the utility model following beneficial effect has:
the anode body is made of a sacrificial material with a potential lower than that of the sleeve, the anode body is arranged on the central tube according to the sacrificial anode protection principle, is insulated from the central tube, the locking sleeve and the lower connector and is conductive to the groove body, the spring and the telescopic block, and after the anode body is placed in a well, the telescopic block is in contact with the inner surface of the sleeve in the well, so that the anode body is corroded first, the sleeve is not corroded, and the inner surface of the sleeve is protected.
The utility model discloses can slow down the sleeve pipe and corrode, improve the development benefit in oil field.
Drawings
FIG. 1 is a schematic sectional view showing the overall structure of a corrosion inhibitor for casing pipes;
FIG. 2 is a half sectional view of the tank 6;
fig. 3 is a view of the telescopic block 8.
In the figure: 1-coupling, 2-central tube, 3-upper insulating pad, 4-anode body, 5-sheath, 6-tank body, 7-upper fixing sleeve, 8-telescopic block, 9-spring, 10-lower fixing sleeve, 11-lower insulating pad, 12-locking sleeve, 13-lower joint, 14- (one group of) grooves and 15- (one group of) blind holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
referring to fig. 1 to 3, the present invention provides a technical solution:
a casing corrosion preventer comprises a central tube 2 and an anode body 4;
the real-time elastic contact mechanism is a radial telescopic elastic mechanism;
the anode body and the real-time elastic contact mechanism are sleeved outside the central tube in a hollow mode, namely the anode body and the real-time elastic contact mechanism are insulated from the central tube.
Further, the real-time elastic contact mechanism comprises a groove body 6, a telescopic block 8 and a spring 9;
the tank body is sleeved outside the central pipe in an empty mode, namely, the inner wall of the tank body and the outer wall of the central pipe form an insulating space, and at least two grooves 14 are uniformly formed in the outer wall of the tank body;
the telescopic block is arranged in the groove, and the inner wall of the telescopic block is provided with at least one blind hole 15;
the spring is arranged in the blind hole, namely the inner end of the spring props against the bottom of the groove, and the outer end of the spring props against the bottom of the blind hole.
Further, the real-time elastic contact mechanism further comprises an upper fixing sleeve 7 and a lower fixing sleeve 10;
the upper fixing sleeve is in threaded connection with the outer circumferential wall of the upper end of the groove body, and the inner wall of the lower end of the upper fixing sleeve forms radial limit on the outer wall of the upper end of the telescopic block;
the lower fixing sleeve is in threaded connection with the outer circumferential wall of the lower end of the groove body, and the inner wall of the upper end of the lower fixing sleeve forms radial limit on the outer wall of the lower end of the telescopic block.
Further, the anode body is sleeved outside the central tube in a hollow mode, namely, the inner wall of the anode body and the outer wall of the central tube form an insulation space, the upper end of the anode body is provided with an upper insulation pad 3, the lower end of the anode body is in contact with the upper end of the tank body, and the lower end face of the tank body is provided with a lower insulation pad 11.
Further, the outer wall of the anode body is sleeved with a sheath 5.
Furthermore, the upper insulating pad is axially limited on the lower end face of an outer convex ring platform arranged on the outer wall of the central tube.
Further, the lower end of the central tube is provided with a lower joint 13 in a threaded manner, the upper end of the central tube is provided with an upper joint in a threaded manner, and the upper joint is the coupling 1.
Further, the locking sleeve 12 is installed on the outer wall of the upper end of the lower joint in a threaded mode, and the upper end of the locking sleeve props against the lower insulating pad.
The coupling 1 is in threaded connection with an oil pipe at the upper end of a central pipe 2, an upper insulating pad 3, an anode body 4, a groove body 6, a lower insulating pad 11 and a locking sleeve 12 are sequentially sleeved on the central pipe 2 from top to bottom, a sheath 5 is respectively sleeved on the lower part of the excircle of the upper insulating pad 3, the excircle of the anode body 4 and the upper part of the excircle of an upper fixing sleeve 7, a telescopic block 8 is embedded in a groove of the groove body 6, the inner side plane of the telescopic block 8 is provided with a group of blind holes for respectively filling a spring 9, inner circles of the upper fixed sleeve 7 and the lower fixed sleeve 10 are provided with internal threads which are respectively connected with the external threads at the upper end and the lower end of the groove body 6, (the structure of the groove body is shown in figure 2, the structure of the telescopic block is shown in figure 3) a step hole at the lower end of the upper fixed sleeve 7 and a step hole at the upper end of the lower fixed sleeve 10 are respectively sleeved on small-diameter outer circles at the two ends of the telescopic block 8, a large step hole of the locking sleeve 12 is provided with internal threads which are connected with the external threads at the upper part of the outer circle of the lower joint 13, and the lower end of the central tube 2 is in threaded connection with the oil tube of the lower joint 13.
The working principle is that the anode body 4 is made of a sacrificial material with a lower potential than that of the sleeve, the anode body 4 is arranged on the central tube 2 and is insulated from the central tube 2, the locking sleeve 12 and the lower joint 13 and is electrically conductive with the groove body 6, the spring 9 and the telescopic block 8 according to the sacrificial anode protection principle, and after the anode body is placed in a well, the telescopic block 8 is in contact with the inner surface of the underground sleeve, so that the anode body 4 is corroded firstly during corrosion, the sleeve is not corroded, and the inner surface of the sleeve is protected.
Example 2:
referring to fig. 1 to 3, the present invention provides a technical solution:
a casing corrosion preventer comprises a central tube 2 and an anode body 4;
the real-time elastic contact mechanism is a radial telescopic elastic mechanism;
the anode body and the real-time elastic contact mechanism are sleeved outside the central tube in a hollow mode, namely the anode body and the real-time elastic contact mechanism are insulated from the central tube.
Further, the real-time elastic contact mechanism comprises a groove body 6, a telescopic block 8 and a spring 9;
the tank body is sleeved outside the central pipe in an empty mode, namely, the inner wall of the tank body and the outer wall of the central pipe form an insulating space, and at least two grooves 14 are uniformly formed in the outer wall of the tank body;
the telescopic block is arranged in the groove, and the inner wall of the telescopic block is provided with at least one blind hole 15;
the spring is arranged in the blind hole, namely the inner end of the spring props against the bottom of the groove, and the outer end of the spring props against the bottom of the blind hole.
Further, the real-time elastic contact mechanism further comprises an upper fixing sleeve 7 and a lower fixing sleeve 10;
the upper fixing sleeve is in threaded connection with the outer circumferential wall of the upper end of the groove body, and the inner wall of the lower end of the upper fixing sleeve forms radial limit on the outer wall of the upper end of the telescopic block;
the lower fixing sleeve is in threaded connection with the outer circumferential wall of the lower end of the groove body, and the inner wall of the upper end of the lower fixing sleeve forms radial limit on the outer wall of the lower end of the telescopic block.
Further, the anode body is sleeved outside the central tube in a hollow mode, namely, the inner wall of the anode body and the outer wall of the central tube form an insulation space, the upper end of the anode body is provided with an upper insulation pad 3, the lower end of the anode body is in contact with the upper end of the tank body, and the lower end face of the tank body is provided with a lower insulation pad 11.
Example 3:
referring to fig. 1 to 3, the present invention provides a technical solution:
a casing corrosion preventer comprises a central tube 2 and an anode body 4;
the real-time elastic contact mechanism is a radial telescopic elastic mechanism;
the anode body and the real-time elastic contact mechanism are sleeved outside the central tube in a hollow mode, namely the anode body and the real-time elastic contact mechanism are insulated from the central tube.
Further, the real-time elastic contact mechanism comprises a groove body 6, a telescopic block 8 and a spring 9;
the tank body is sleeved outside the central pipe in an empty mode, namely, the inner wall of the tank body and the outer wall of the central pipe form an insulating space, and at least two grooves 14 are uniformly formed in the outer wall of the tank body;
the telescopic block is arranged in the groove, and the inner wall of the telescopic block is provided with at least one blind hole 15;
the spring is arranged in the blind hole, namely the inner end of the spring props against the bottom of the groove, and the outer end of the spring props against the bottom of the blind hole.
Although fig. 1 to 3 are used in all the above embodiments, it is obvious to those skilled in the art that separate drawings are not shown as long as the parts or structural features missing in the embodiments are removed from the drawings. As will be clear to the skilled person. Of course, the embodiments with more components are only the preferred embodiments, and the embodiments with fewer components are the basic embodiments, but the basic objects of the present invention can also be achieved, so all of these modified embodiments are within the scope of the present invention.
All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. Such as welding, threaded connections, etc.
In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A casing corrosion preventer comprises a central tube and an anode body;
the device is characterized by also comprising a real-time elastic contact mechanism, wherein the real-time elastic contact mechanism is a radial telescopic elastic mechanism;
the anode body and the real-time elastic contact mechanism are sleeved outside the central tube in a hollow mode, namely the anode body and the real-time elastic contact mechanism are insulated from the central tube.
2. The casing corrosion preventer according to claim 1, wherein the real-time elastic contact mechanism comprises a groove body, a telescopic block and a spring;
the tank body is sleeved outside the central pipe in an empty mode, namely, the inner wall of the tank body and the outer wall of the central pipe form an insulating space, and at least two grooves are uniformly formed in the outer wall of the tank body;
the telescopic block is arranged in the groove, and the inner wall of the telescopic block is provided with at least one blind hole;
the spring is arranged in the blind hole, namely the inner end of the spring props against the bottom of the groove, and the outer end of the spring props against the bottom of the blind hole.
3. The corrosion inhibitor for casing pipes according to claim 2, wherein said real-time elastic contact means further comprises an upper fixing sleeve, a lower fixing sleeve;
the upper fixing sleeve is in threaded connection with the outer circumferential wall of the upper end of the groove body, and the inner wall of the lower end of the upper fixing sleeve forms radial limit on the outer wall of the upper end of the telescopic block;
the lower fixing sleeve is in threaded connection with the outer circumferential wall of the lower end of the groove body, and the inner wall of the upper end of the lower fixing sleeve forms radial limit on the outer wall of the lower end of the telescopic block.
4. The casing pipe corrosion preventer according to claim 2 or 3, wherein the anode body is sleeved outside the central pipe in a hollow manner, i.e., the inner wall of the anode body and the outer wall of the central pipe form an insulating space, an upper insulating pad is arranged at the upper end of the anode body, the lower end of the anode body is in contact with the upper end of the tank body, and a lower insulating pad is arranged on the lower end surface of the tank body.
5. The casing corrosion protector according to claim 4, wherein the outer wall of the anode body is sleeved with a sheath.
6. The casing corrosion protector according to claim 4, wherein the upper insulating pad is axially retained on a lower end surface of an outer convex annular table formed on an outer wall of the central tube.
7. The casing corrosion inhibitor of claim 4, wherein the lower end of the central tube is threaded with the lower joint and the upper end of the central tube is threaded with the upper joint.
8. The corrosion protector for casing pipe according to claim 7, wherein the outer wall of the upper end of the lower joint is screwed with a locking sleeve, and the upper end of the locking sleeve is pressed against the lower insulating pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120284577.5U CN214327891U (en) | 2021-02-01 | 2021-02-01 | Anticorrosive device for casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120284577.5U CN214327891U (en) | 2021-02-01 | 2021-02-01 | Anticorrosive device for casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214327891U true CN214327891U (en) | 2021-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120284577.5U Active CN214327891U (en) | 2021-02-01 | 2021-02-01 | Anticorrosive device for casing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214327891U (en) |
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2021
- 2021-02-01 CN CN202120284577.5U patent/CN214327891U/en active Active
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