CN219808966U - Corrosion-resistant coupling for lining oil pipe - Google Patents
Corrosion-resistant coupling for lining oil pipe Download PDFInfo
- Publication number
- CN219808966U CN219808966U CN202321114511.7U CN202321114511U CN219808966U CN 219808966 U CN219808966 U CN 219808966U CN 202321114511 U CN202321114511 U CN 202321114511U CN 219808966 U CN219808966 U CN 219808966U
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- China
- Prior art keywords
- end cover
- coupling body
- corrosion
- coupling
- oil pipe
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- 230000008878 coupling Effects 0.000 title claims abstract description 89
- 238000010168 coupling process Methods 0.000 title claims abstract description 89
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 89
- 238000005260 corrosion Methods 0.000 title claims abstract description 55
- 230000007797 corrosion Effects 0.000 title claims abstract description 44
- 238000007789 sealing Methods 0.000 claims abstract description 48
- -1 quinoline quaternary ammonium salt Chemical class 0.000 claims description 5
- SMWDFEZZVXVKRB-UHFFFAOYSA-N anhydrous quinoline Natural products N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 238000006056 electrooxidation reaction Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 150000001345 alkine derivatives Chemical class 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- RREANTFLPGEWEN-MBLPBCRHSA-N 7-[4-[[(3z)-3-[4-amino-5-[(3,4,5-trimethoxyphenyl)methyl]pyrimidin-2-yl]imino-5-fluoro-2-oxoindol-1-yl]methyl]piperazin-1-yl]-1-cyclopropyl-6-fluoro-4-oxoquinoline-3-carboxylic acid Chemical compound COC1=C(OC)C(OC)=CC(CC=2C(=NC(\N=C/3C4=CC(F)=CC=C4N(CN4CCN(CC4)C=4C(=CC=5C(=O)C(C(O)=O)=CN(C=5C=4)C4CC4)F)C\3=O)=NC=2)N)=C1 RREANTFLPGEWEN-MBLPBCRHSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Landscapes
- Prevention Of Electric Corrosion (AREA)
Abstract
The utility model relates to the technical field of oilfield tubing couplings, and particularly discloses an anti-corrosion coupling for lining tubing. Including the coupling body, coupling body inside both ends are equipped with first internal thread and second internal thread respectively, coupling body outside both ends are equipped with first pipe thread b and second pipe thread b respectively, coupling body both ends face is equipped with second seal groove b and fourth seal groove b respectively, the anticorrosive coupling still includes anticorrosive lining. The sealing rings c and d embedded into the end faces of the left end cover and the right end cover and the two ends of the coupling body, and the sealing rings a and b fastened to the outer circumferences of the first oil pipe and the second oil pipe are adopted, so that corrosion of an external corrosion medium to the threaded connection part of the oil pipe and the coupling can be prevented, and the anode block extruded and fixed by the two ends of the left end cover and the right end cover is sleeved on the outer circumference of the coupling body, so that electrochemical corrosion of an external solution can be prevented.
Description
Technical Field
The utility model relates to the technical field of oilfield oil pipe couplings, in particular to an anti-corrosion coupling for lining oil pipes.
Background
With the development of oil gas resources in China towards the directions of deep, low, sea and non, the oil gas development and production working condition environments are increasingly complex and harsh (such as high temperature, high pressure, high H2S/CO2 content, bacteria and the like), and part of oil gas field development enters the middle and later stages, a large number of acid fracturing, CO2 flooding, air foam flooding, polymer flooding and other yield increasing technologies are adopted to introduce new corrosion problems, so that the corrosion leakage problem of oil gas pipelines is very outstanding, and the safe and efficient development and transportation of the oil gas resources are seriously influenced;
tubing couplings are one type of oilfield drilling tool that are primarily used for connection of tubing. The conventional corrosion prevention treatment is carried out on the existing coupling, but in the complex operation environment, corrosion of different degrees occurs at the oil pipe coupling, particularly the threaded connection and the coupling body are severely corroded, and according to analysis, the corrosion of the threaded connection is caused by the penetration of an external corrosion medium of the oil pipe, and the coupling body is mainly subjected to local corrosion and galvanic corrosion. And the coupling corrosion can lead to corrosion perforation failure events, thereby increasing oil recovery costs.
Therefore, in order to improve the above situation, it is necessary to provide a corrosion protection coupling for lining the oil pipe to overcome the above technical problems.
Disclosure of Invention
The utility model aims at solving the defects in the prior art and provides an anti-corrosion coupling for an inner lining oil pipe, so that the problem that the oil pipe coupling is corroded to different degrees is solved.
The technical proposal is as follows:
the utility model provides a lining oil pipe's anticorrosive coupling, includes the coupling body, coupling body inside both ends are equipped with first internal thread and second internal thread respectively, coupling body outside both ends are equipped with first pipe thread b and second pipe thread b respectively, coupling body both ends face is equipped with second seal groove b and fourth seal groove b respectively, still be equipped with anticorrosive lining on the coupling body inner wall.
Preferably, the two ends of the coupling body are provided with a left end cover and a right end cover, a first pipe thread a and a tool withdrawal groove are respectively arranged on the inner side of one end of the left end cover, a second sealing groove a is arranged on the inner side end face of one end of the left end cover, and a first sealing groove is arranged on the inner side of the other end of the left end cover. Similarly, a second pipe thread a is arranged on the inner side of one end of the right end cover, a fourth sealing groove a is arranged on the inner side end face of one end of the right end cover, and a third sealing groove is arranged on the inner side of the other end of the right end cover.
Preferably, the corrosion-resistant lining layer is an adsorption film type corrosion inhibitor;
preferably, the corrosion protection liner is a quinoline quaternary ammonium salt.
Preferably, the left end cover is in threaded connection with the first pipe thread b outside one end of the coupling body through the first pipe thread a. The sealing ring c is inlaid in the second sealing groove a of the left end cover and the second sealing groove b at one end of the connecting pipe body.
Preferably, the right end cover is in threaded connection with a second pipe thread b outside the other end of the coupling body through a second pipe thread a. The sealing ring d is inlaid in the fourth sealing groove a of the right end cover and the fourth sealing groove b at one end of the connecting pipe body.
Preferably, the first external thread of the first oil pipe is in threaded connection with the first internal thread inside one end of the coupling body, the inner circumference of the left end cover is sleeved at the outer circumference of the first oil pipe, and the sealing ring a is inlaid in the first sealing groove of the left end cover and is fastened to the outer circumference of the first oil pipe.
Preferably, the second external thread of the second oil pipe is in threaded connection with the second internal thread inside the other end of the coupling body, the inner circumference of the right end cover is sleeved at the outer circumference of the second oil pipe, and the sealing ring b is embedded into the third sealing groove of the right end cover and is fastened to the outer circumference of the second oil pipe.
Preferably, the anti-corrosion coupling further comprises an anode block, wherein the anode block is sleeved at the outer circumference of the coupling body, and two ends of the anode block are extruded and fixed by the left end cover and the right end cover.
The beneficial effects of the utility model are as follows:
1. through adopting inlay sealing washer c and sealing washer d to left end cover, right-hand member lid and coupling body both ends terminal surface to and inlay in the first seal groove of left end cover, the third seal groove of right-hand member lid in fasten to first oil pipe, second oil pipe's outer circumference sealing washer a, sealing washer b, above-mentioned structure can prevent the corruption of outside corrosive medium to oil pipe and coupling threaded connection department. And simultaneously, the corrosion of the external corrosion medium to the inside of the butt joint hoop body can be prevented.
2. An anti-corrosion lining is arranged in the coupling body, and the anti-corrosion lining adopts quinoline quaternary ammonium salt, alkyne oxymethyl quaternary ammonium salt, imidazoline quaternary ammonium salt and imidazoline Mannich bases. The corrosion inhibition mechanism is that atoms with lone pair electrons such as N, P, S, O in molecules form coordination bonds with iron and are adsorbed on the surface of metal to form a very thin protective film, so that the corrosion process of a coupling body is inhibited.
3. The anode blocks which are fixedly extruded by the two ends of the left end cover and the right end cover are sleeved at the outer circumference of the coupling body, so that electrochemical corrosion of external solution can be prevented, and external corrosion of the coupling body is prevented. And the replaceable anode block mounting structure is convenient to operate.
Drawings
FIG. 1 is a schematic perspective view of the present utility model;
FIG. 2 is a front view of the present utility model;
FIG. 3 is a schematic view of A-A cross-sectional structure of the present utility model;
FIG. 4 is a schematic view of a semi-sectional structure of a coupling body;
FIG. 5 is a schematic diagram of a semi-sectional structure of the left end cap;
in the figure: 1. a first oil pipe; 2. a left end cover; 3. an anode block; 4. a right end cover; 5. a second oil pipe; 6. a coupling body; 1011. a first external thread; 1012. a second external thread; 2011. a first seal groove; 2021. a second seal groove a; 203. a tool retracting groove; 2041. a first pipe thread a; 4011. a third seal groove; 4021. a fourth seal groove a; 4041. a second pipe thread a; 601. a corrosion resistant liner; 6021. a first internal thread; 6022. a second internal thread; 6031. a second seal groove b; 6032. a fourth seal groove b; 6041. a first pipe thread b; 6042. a second pipe thread b;7011, seal ring a; 7012. a sealing ring b; 7021. a sealing ring c; 7022. and (d) a sealing ring.
Detailed Description
The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
With reference to figures 1 to 5 of the drawings,
the utility model provides a lining oil pipe's anticorrosive coupling, includes coupling body 6, coupling body 6 inside both ends are equipped with first internal thread 6021 and second internal thread 6022 respectively, coupling body 6 outside both ends are equipped with first pipe thread b6041 and second pipe thread b6042 respectively, coupling body 6 both ends face is equipped with second seal groove b6031 and fourth seal groove b6032 respectively, still be equipped with anticorrosive lining 601 on the coupling body 6 inner wall.
The corrosion protection liner 601 is an adsorption film type corrosion inhibitor such as quinoline quaternary ammonium salt, alkyne oxymethyl quaternary ammonium salt, imidazoline mannich base.
The corrosion inhibition mechanism of the corrosion-resistant lining layer is that atoms with lone pair electrons such as N, P, S, O in molecules form coordination bonds with iron and are adsorbed on the surface of metal to form a very thin protective film, so that the corrosion process is inhibited.
The two ends of the coupling body 6 are provided with a left end cover 2 and a right end cover 4, the inner side of one end of the left end cover 2 is respectively provided with a first pipe thread a2041 and a tool withdrawal groove 203, the inner side end surface of one end of the left end cover 2 is provided with a second seal groove a2021, and the inner side of the other end of the left end cover 2 is provided with a first seal groove 2011; the inner side of one end of the right end cover 4 is provided with a second pipe thread a4041, the inner side end surface of one end of the right end cover 4 is provided with a fourth sealing groove a4021, and the inner side of the other end of the right end cover is provided with a third sealing groove 4011.
The left end cover 2 is in threaded connection with a first pipe thread b6041 outside one end of the coupling body 6 through a first pipe thread a 2041; seal ring c7021 is inlaid in second seal groove a2021 of left end cover 2 and second seal groove b6031 of one end of coupling body 6.
The right end cap 4 is in threaded connection with a second pipe thread b6042 outside the other end of the coupling body 6 through a second pipe thread a 4041. The sealing ring d7022 is inlaid in the fourth sealing groove a4021 of the right end cover 4 and the fourth sealing groove b6032 at one end of the coupling body 6.
The first external thread 1011 of the first oil pipe 1 is in threaded connection with the first internal thread 6021 inside one end of the coupling body 6, the inner circumference of the left end cover 2 is sleeved at the outer circumference of the first oil pipe 1, and the sealing ring a7011 is inlaid in the first sealing groove 2011 of the left end cover 2 and fastened to the outer circumference of the first oil pipe 1.
The second external thread 1012 of the second oil pipe 5 is in threaded connection with the second internal thread 6022 inside the other end of the coupling body 6, the inner circumference of the right end cover 4 is sleeved at the outer circumference of the second oil pipe 2, and the sealing ring b7012 is inlaid in the third sealing groove 4011 of the right end cover 4 and fastened to the outer circumference of the second oil pipe 5.
The structure can prevent the corrosion of the external corrosion medium to the threaded connection part of the oil pipe and the coupling, and can also prevent the corrosion of the external corrosion medium to the inside of the coupling body.
The anti-corrosion coupling further comprises an anode block 3, the anode block 3 is sleeved at the outer circumference of the coupling body 6, two ends of the anode block are extruded and fixed by the left end cover 2 and the right end cover 4, and the anode block is additionally arranged to prevent electrochemical corrosion of an external solution to the coupling body, so that the coupling body is prevented from being corroded, and the replaceable anode block mounting structure is convenient to operate.
In operation, anode block 3 is mounted on the outer circumference of coupling body 6, first oil pipe 1 is connected to first internal thread 6021 of coupling body 6 one end through first external thread 1011, second oil pipe 5 is connected to second internal thread 6022 of coupling body 6 other end through second external thread 1012, seal ring c7021 is inlaid in second seal groove b6031 of coupling body 6 one end terminal surface, seal ring a7011 is placed in first seal groove 2011 of left end cover 2, left end cover 2 is sleeved outside first oil pipe 1, left end cover 2 is connected to one end of coupling body 6 through first pipe thread a2041, and seal ring c7021 is compressed. The sealing ring d7022 is inlaid in a fourth sealing groove b6032 on the end face of the other end of the coupling body 6, the sealing ring b7012 is placed in a third sealing groove 4011 of the right end cover 4, the right end cover 4 is sleeved on the outer side of the second oil pipe 5, the right end cover 4 is connected to the other end of the coupling body 6 through a second pipe thread a4041 in a threaded mode, the sealing ring d2022 is compressed, and meanwhile the anode block 3 is fixedly and firmly arranged.
When crude oil passes through the oil pipe and the anti-corrosion coupling, the structure can prevent the corrosion of external corrosion medium to the coupling, and the anti-corrosion lining layer in the coupling body can slow down the corrosion of the corrosion medium contained in the crude oil to the coupling.
The above description is of the preferred embodiments of the present utility model, and any person skilled in the art may modify the present utility model or make modifications to the present utility model with the technical solutions described above. Therefore, any simple modification or equivalent made according to the technical solution of the present utility model falls within the scope of the protection claimed by the present utility model.
Claims (6)
1. An anticorrosive coupling of inside lining oil pipe, its characterized in that: the anti-corrosion coupling comprises a coupling body (6), wherein first internal threads (6021) and second internal threads (6022) are respectively arranged at two ends of the inside of the coupling body (6), first pipe threads b (6041) and second pipe threads b (6042) are respectively arranged at two ends of the outside of the coupling body (6), second sealing grooves b (6031) and fourth sealing grooves b (6032) are respectively arranged at two end faces of the coupling body (6), and an anti-corrosion lining layer (601) is further arranged on the inner wall of the coupling body (6);
the coupling is characterized in that a left end cover (2) and a right end cover (4) are arranged at two ends of the coupling body (6), a first pipe thread a (2041) and a tool withdrawal groove (203) are respectively arranged on the inner side of one end of the left end cover (2), a second sealing groove a (2021) is arranged on the inner side end face of one end of the left end cover (2), a first sealing groove (2011) is arranged on the inner side of the other end of the left end cover (2), a second pipe thread a (4041) is arranged on the inner side of one end of the right end cover (4), a fourth sealing groove a (4021) is arranged on the inner side end face of one end of the right end cover (4), and a third sealing groove (4011) is arranged on the inner side of the other end of the right end cover.
2. The lined tubing corrosion protection collar of claim 1, wherein: the corrosion-resistant lining layer (601) is an adsorption film type corrosion inhibitor.
3. A lined tubing corrosion protection collar according to claim 2, wherein: the corrosion protection lining (601) is quinoline quaternary ammonium salt.
4. The lined tubing corrosion protection collar of claim 1, wherein: the left end cover (2) is in threaded connection with a first pipe thread b (6041) at the outer side of one end of the coupling body (6) through a first pipe thread a (2041), and a sealing ring c (7021) is inlaid in a second sealing groove a (2021) of the left end cover (2) and a second sealing groove b (6031) at one end of the coupling body (6).
5. The lined tubing corrosion protection collar of claim 4, wherein: the first external thread (1011) of first oil pipe (1) with the inside first internal thread (6021) of coupling body (6) one end threaded connection, the outer periphery department at first oil pipe (1) is established to the interior circumference cover of left end cover (2), sealing washer a (7011) is inlayed in first seal groove (2011) of left end cover (2) and is fastened to the outer periphery of first oil pipe (1), the second external thread (1012) of second oil pipe (5) with the inside second internal thread (6022) of coupling body (6) other end threaded connection, the outer periphery department at second oil pipe (2) is established to the interior circumference cover of right-hand member cover (4), sealing washer b (7012) is inlayed in third seal groove (4011) of right-hand member cover (4) and is fastened to the outer periphery of second oil pipe (5).
6. The lined tubing corrosion protection collar of claim 1, wherein: the coupling further comprises an anode block (3), the anode block (3) is sleeved on the outer circumference of the coupling body (6), and two ends of the anode block are extruded and fixed by the left end cover (2) and the right end cover (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321114511.7U CN219808966U (en) | 2023-05-10 | 2023-05-10 | Corrosion-resistant coupling for lining oil pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321114511.7U CN219808966U (en) | 2023-05-10 | 2023-05-10 | Corrosion-resistant coupling for lining oil pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219808966U true CN219808966U (en) | 2023-10-10 |
Family
ID=88215059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321114511.7U Active CN219808966U (en) | 2023-05-10 | 2023-05-10 | Corrosion-resistant coupling for lining oil pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219808966U (en) |
-
2023
- 2023-05-10 CN CN202321114511.7U patent/CN219808966U/en active Active
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