CN111980597A - Composite pipe screwed joint - Google Patents
Composite pipe screwed joint Download PDFInfo
- Publication number
- CN111980597A CN111980597A CN201910429892.XA CN201910429892A CN111980597A CN 111980597 A CN111980597 A CN 111980597A CN 201910429892 A CN201910429892 A CN 201910429892A CN 111980597 A CN111980597 A CN 111980597A
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- CN
- China
- Prior art keywords
- surface section
- section
- sealing surface
- shoulder
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 79
- 230000007704 transition Effects 0.000 claims abstract description 33
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 238000005260 corrosion Methods 0.000 claims description 13
- 230000007797 corrosion Effects 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 7
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 6
- 239000010962 carbon steel Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The invention discloses a composite pipe threaded joint which comprises a pipe body joint with external threads and a coupling joint with internal threads, wherein the pipe body joint comprises a pipe body and a lining fixed on the inner wall of the pipe body; the pipe body joint is provided with a first thread section, a first transition section, a first outer sealing surface section, a first shoulder and a first inner sealing surface section which are arranged in sequence; the hoop joint is provided with a second thread section, a second transition section, a second outer sealing surface section, a second shoulder and a second inner sealing surface section which are sequentially arranged and respectively correspond to the first thread section, the first transition section, the first outer sealing surface section, the first shoulder and the first inner sealing surface section; the second outer sealing surface section, the second shoulder and the second inner sealing surface section enclose a groove capable of accommodating the end of the pipe body joint. The composite pipe threaded joint has high sealing performance.
Description
Technical Field
The invention relates to a threaded joint, in particular to a threaded joint of a composite pipe.
Background
As the oil reservoir blocks at home and abroad contain high-concentration high-corrosivity components such as H2S, CO2 and Cl ions, the problems of stress corrosion cracking, corrosion perforation and the like are easily caused under the high-corrosion condition of the common carbon steel pipe, so that the use requirement cannot be met. Researchers develop a high alloy pipe which can be applied to the well condition environment according to the requirements of ISO 13680 and ISO 15156 standards, the alloy material contains corrosion-resistant alloy elements such as Cr, Ni and Mo with high proportion, and a stable passive film can be formed on the surface so as to obtain the general corrosion resistance and the local corrosion resistance. However, the alloy material contains alloy elements with high proportion, so the material cost is high and is dozens of times of that of the common carbon steel pipe.
The pipes (tubing and casing) used in the oil and gas production process are typically 10 meters each, and are connected one by one in a threaded connection to be lowered into the ground to a depth of several kilometers. Because the petroleum is usually buried in the stratum depth of more than 5000 meters, the highly corrosive fluid in the pipe has very high pressure, and meanwhile, the joint is under the composite action forces of very large tension, compression, internal pressure, external pressure, bending, torsion and the like, and the common sealing performance at the joint cannot meet the use requirement.
Disclosure of Invention
In order to solve the problems, the invention provides a composite pipe threaded joint which ensures the sealing performance.
In order to achieve the purpose, the composite pipe threaded joint comprises a pipe body joint with external threads and a coupling joint with internal threads, wherein the pipe body joint comprises a pipe body and a lining fixed on the inner wall of the pipe body; the pipe body joint is provided with a first thread section, a first transition section, a first outer sealing surface section, a first shoulder and a first inner sealing surface section which are arranged in sequence; the hoop joint is provided with a second thread section, a second transition section, a second outer sealing surface section, a second shoulder and a second inner sealing surface section which are sequentially arranged and respectively correspond to the first thread section, the first transition section, the first outer sealing surface section, the first shoulder and the first inner sealing surface section; the first thread section, the first transition section, the first outer seal surface section and the first shoulder are disposed on the tube body, and the first inner seal surface section is disposed on the liner; the second outer sealing surface section, the second shoulder and the second inner sealing surface section enclose a groove capable of accommodating the end of the pipe body joint.
Preferably, circular arc transition is adopted between the first transition section and the first outer sealing surface section, between the first outer sealing surface section and the first shoulder, between the first shoulder and the first inner sealing surface section, between the second transition section and the second outer sealing surface section, between the second outer sealing surface section and the second shoulder, and between the second shoulder and the second inner sealing surface section.
Preferably, the first thread section and the second thread section are buttress threads, and the thread taper is 0.02-0.12.
Preferably, the first outer sealing surface section, the second outer sealing surface section, the first inner sealing surface section and the second inner sealing surface section are all conical surfaces.
Preferably, the taper of the first and second outer sealing surface sections is the same and the taper of the first and second inner sealing surface sections is the same.
Preferably, the first outer sealing surface section and the second outer sealing surface section are an interference fit.
Preferably, the first inner sealing surface section and the second inner sealing surface section are an interference fit.
Preferably, the axial length of the first outer sealing surface section, the axial length of the second outer sealing surface section, the axial length of the first inner sealing surface section, the axial length of the second inner sealing surface section and the axial length of the second outer sealing surface section are all 1-5 mm.
Preferably, the first transition section and the second transition section are cylindrical surfaces.
Preferably, the pipe body is made of carbon steel, and the lining is made of corrosion-resistant alloy.
The composite pipe threaded joint provided by the invention adopts the threaded connection joint which is processed on the composite pipe and has a lower price than that of the integral alloy pipe, and the threaded joint has higher sealing performance and can prevent high-corrosion fluid in the pipe from invading the pipe body to cause corrosion failure.
Drawings
FIG. 1 is a schematic view of a composite tubular threaded joint of the present invention;
FIG. 2 is a schematic view of a pipe body fitting;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a schematic view of a coupling joint;
fig. 5 is a partially enlarged view of fig. 4.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to the drawings.
As shown in fig. 1 to 5, the composite pipe threaded joint of the present invention includes a pipe body joint with external threads and a coupling joint 5 with internal threads, and the pipe body joint includes a pipe body 1 and a liner 2 fixed on an inner wall of the pipe body. The pipe body 1 is made of carbon steel, and the lining 2 is made of corrosion-resistant alloy. The composite pipe is adopted, the material cost of the pipe is reduced, the thickness of the lining 2 is 0.5-3 mm, and the pipe body 1 and the lining 2 are fixedly connected into a whole.
The pipe body joint is provided with a first thread section 3, a first transition section 41, a first outer sealing surface section 42, a first shoulder 43 and a first inner sealing surface section 44 which are arranged in sequence; the coupling sub 5 has a second thread section 6, a second transition section 71, a second outer sealing surface section 72, a second shoulder 73 and a second inner sealing surface section 74 which are arranged in sequence and correspond to the first thread section 3, the first transition section 41, the first outer sealing surface section 42, the first shoulder 43 and the first inner sealing surface section 44 respectively. The first transition section 41, the first outer seal surface section 42, the first shoulder 43 and the first inner seal surface section 44 are disposed at the end 4 of the pipe body fitting, the first thread section 3, the first transition section 41, the first outer seal surface section 42 and the first shoulder 43 are disposed on the pipe body 1, and the first inner seal surface section 44 is disposed on the liner 2. Since the inner and outer walls of a large industrial pipe body cannot be perfectly circular, it is preferable to provide the first inner seal surface section 44 on the inner liner 2 using a corrosion-resistant alloy in consideration of the influence of machining tolerance.
The second outer sealing surface section 72, the second shoulder 73 and the second inner sealing surface section 74 enclose a recess 7 capable of receiving the body fitting end 4. The coupling head 5 is further provided with a third shoulder 75 to form the cross-section of the coupling head 5 into a hook shape.
Circular arc transitions are adopted between the first transition section 41 and the first outer sealing surface section 42, between the first outer sealing surface section 42 and the first shoulder 43, between the first shoulder 43 and the first inner sealing surface section 44, between the second transition section 71 and the second outer sealing surface section 72, between the second outer sealing surface section 72 and the second shoulder 73, and between the second shoulder 73 and the second inner sealing surface section 74, and the circular arc radius is 0.2-6 mm.
The first thread section 3 and the second thread section 6 are used for enabling the joints to be screwed mutually, the first thread section 3 and the second thread section 6 are buttress threads, and the thread taper is 0.02-0.12, preferably 0.0625.
The first outer sealing surface section 42, the second outer sealing surface section 72, the first inner sealing surface section 44 and the second inner sealing surface section 74 are all conical surfaces. The taper of the first outer seal face segment 42 and the second outer seal face segment 72 is the same, and the taper of the first inner seal face segment 44 and the second inner seal face segment 74 is the same. The conicity of the first outer sealing surface section 42, the second outer sealing surface section 72, the first inner sealing surface section 44 and the second inner sealing surface section 74 is 0.1-0.75.
The first outer seal face segment 42 and the second outer seal face segment 72 are interference fit to prevent fluid flow out of the pipe into the pipe while limiting radial deformation of the joint end.
The first inner seal surface section 44 and the second inner seal surface section 74 are in interference fit, and corrosion fluid in the pipe is prevented from invading the pipe body 1 made of carbon steel.
The axial lengths of the first outer sealing surface section 42, the second outer sealing surface section 72, the first inner sealing surface section 44 and the second inner sealing surface section 74 are all 1-5 mm.
The first transition section 41 and the second transition section 42 are transition portions of a thread section and a shoulder, and have a transitional connection function, and the first transition section 41 and the second transition section 42 are preferably cylindrical surfaces, and can also be small-angle conical surfaces, circular arc surfaces and the like.
The first and second shoulders 43, 73 function to limit axial deformation of the connector end.
The coupling and the pipe body are respectively provided with threads at two ends to form a joint, the coupling joint and the pipe body joint are connected in a threaded manner to form a whole, and the coupling joint and the pipe body joint are alternately connected and screwed one by one when in use, so that a pipe string with the length of several kilometers is formed.
As described above, exemplary embodiments of the present invention are described in detail with reference to the accompanying drawings. It should be understood that the invention is not intended to be limited to these specific details. Equivalent or similar changes in the structure and features of the exemplary embodiments may be made without departing from the spirit and scope of the invention, which shall also fall within the scope of the protection defined by the claims appended hereto.
Claims (10)
1. A composite pipe threaded joint comprises a pipe body joint with external threads and a coupling joint with internal threads,
the pipe body joint comprises a pipe body and a lining fixed on the inner wall of the pipe body;
the pipe body joint is provided with a first thread section, a first transition section, a first outer sealing surface section, a first shoulder and a first inner sealing surface section which are arranged in sequence;
the hoop joint is provided with a second thread section, a second transition section, a second outer sealing surface section, a second shoulder and a second inner sealing surface section which are sequentially arranged and respectively correspond to the first thread section, the first transition section, the first outer sealing surface section, the first shoulder and the first inner sealing surface section;
the first thread section, the first transition section, the first outer seal surface section and the first shoulder are disposed on the tube body, and the first inner seal surface section is disposed on the liner;
the second outer sealing surface section, the second shoulder and the second inner sealing surface section enclose a groove capable of accommodating the end of the pipe body joint.
2. A composite tubular threaded joint as set forth in claim 1 wherein the circular arc transitions are provided between the first transition section and the first outer seal surface section, between the first outer seal surface section and the first shoulder, between the first shoulder and the first inner seal surface section, between the second transition section and the second outer seal surface section, between the second outer seal surface section and the second shoulder, and between the second shoulder and the second inner seal surface section.
3. A composite pipe threaded joint as defined in claim 1, wherein the first and second thread segments are buttress threads having a thread taper of 0.02-0.12.
4. A composite tubular threaded joint as set forth in claim 1 wherein the first outer seal surface section, the second outer seal surface section, the first inner seal surface section, and the second inner seal surface section are conical surfaces.
5. A composite tubular threaded joint as set forth in claim 4 wherein the taper of the first and second outer seal surface segments is the same and the taper of the first and second inner seal surface segments is the same.
6. A composite tubular threaded joint as set forth in claim 1 wherein said first outer sealing surface section and said second outer sealing surface section are an interference fit.
7. A composite tubular threaded joint as set forth in claim 1 wherein said first inner sealing surface section and said second inner sealing surface section are an interference fit.
8. A composite tubular threaded joint as set forth in claim 1 wherein the axial lengths of the first outer seal surface section, the second outer seal surface section, the first inner seal surface section, and the second inner seal surface section are each 1 to 5 mm.
9. A compound tubular threaded joint as set forth in claim 1 wherein the first and second transition sections are cylindrical.
10. A threaded joint for composite pipes as set forth in claim 1 wherein the pipe body is made of carbon steel and the liner is made of corrosion resistant alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910429892.XA CN111980597A (en) | 2019-05-22 | 2019-05-22 | Composite pipe screwed joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910429892.XA CN111980597A (en) | 2019-05-22 | 2019-05-22 | Composite pipe screwed joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111980597A true CN111980597A (en) | 2020-11-24 |
Family
ID=73436412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910429892.XA Pending CN111980597A (en) | 2019-05-22 | 2019-05-22 | Composite pipe screwed joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111980597A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5765836A (en) * | 1996-01-18 | 1998-06-16 | Marubeni Tubulars, Inc. | Sealing system |
| GB2445309A (en) * | 2004-04-21 | 2008-07-02 | Baker Hughes Inc | Expandable tubular connection |
| CN201377293Y (en) * | 2008-08-07 | 2010-01-06 | 无锡法斯特能源开发科技有限公司 | Screwed nipple for air-seal oil pipe |
| CN201826771U (en) * | 2010-06-25 | 2011-05-11 | 上海海隆石油钻具有限公司 | Air-tight anti-gluing drill pipe connector |
| CN202055766U (en) * | 2011-04-14 | 2011-11-30 | 山东墨龙石油机械股份有限公司 | Non-standard oil pipe for polymer material lined liner pipe |
-
2019
- 2019-05-22 CN CN201910429892.XA patent/CN111980597A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5765836A (en) * | 1996-01-18 | 1998-06-16 | Marubeni Tubulars, Inc. | Sealing system |
| GB2445309A (en) * | 2004-04-21 | 2008-07-02 | Baker Hughes Inc | Expandable tubular connection |
| CN201377293Y (en) * | 2008-08-07 | 2010-01-06 | 无锡法斯特能源开发科技有限公司 | Screwed nipple for air-seal oil pipe |
| CN201826771U (en) * | 2010-06-25 | 2011-05-11 | 上海海隆石油钻具有限公司 | Air-tight anti-gluing drill pipe connector |
| CN202055766U (en) * | 2011-04-14 | 2011-11-30 | 山东墨龙石油机械股份有限公司 | Non-standard oil pipe for polymer material lined liner pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201124 |
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| RJ01 | Rejection of invention patent application after publication |