CN110439478A - Inner layer sleeve is the pipe in pipe casing being threadedly coupled and its assembly method - Google Patents
Inner layer sleeve is the pipe in pipe casing being threadedly coupled and its assembly method Download PDFInfo
- Publication number
- CN110439478A CN110439478A CN201910652402.2A CN201910652402A CN110439478A CN 110439478 A CN110439478 A CN 110439478A CN 201910652402 A CN201910652402 A CN 201910652402A CN 110439478 A CN110439478 A CN 110439478A
- Authority
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- China
- Prior art keywords
- screw thread
- layer sleeve
- inner layer
- box cupling
- casing
- Prior art date
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- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
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
-
- 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
It is the pipe in pipe casing being threadedly coupled and its assembly method, including internal screw thread box cupling connector and external screw thread box cupling connector, outer layer sleeve and inner layer sleeve that the present invention, which discloses a kind of inner layer sleeve,；Connection screw thread is arranged in the both ends of inner layer sleeve, and connection screw thread is arranged in the first end of outer layer sleeve, and second end tube wall is smooth；The first end of internal screw thread box cupling connector is threadedly coupled with the first end of external screw thread box cupling connector, the second end of external screw thread box cupling connector is provided with the inner layer sleeve connection screw thread for connecting inner layer sleeve, the exterior bayonet slot for connecting outer layer sleeve second end is arranged in the outside of external screw thread box cupling connector second end, by the assembly for completing double combination casing in plant produced, construction site only needs for internal screw thread box cupling connector quickly to connect with external screw thread box cupling connector, it ensure that safety, efficiently, timely casing job process, using double-layer sleeve structure, collapsoing strength is high, outer layer sleeve plays the role of being effectively protected to inner layer sleeve, inner layer sleeve is hardly damaged.
Description
Technical field
The invention belongs to the structure of casing used in petroleum-gas fiedl exploration and development and its assembly methods, and in particular in one kind
Layer casing is the pipe in pipe casing being threadedly coupled and its assembly method.
Background technique
With going deep into for domestic and international each oil field production development, all there is different degrees of casing damage in most oil fields, right
The production and exploitation of petroleum cause very big influence.Double combination casing is a kind of important means that casing is protected in advance, mesh
Preceding major part double combination casing is that the collapsoing strength of casing can be improved in this way using cemented method between internal and external casing,
But in the stratum biggish region of wriggling, the extruding force on stratum directly passes through outer layer sleeve, cement sheath passes to inner layer sleeve, to interior
Layer casing damages, and causes petroleum production engineering that can not carry out, and it is complicated, not easy to operate to construct.Meanwhile existing literature and patent
Etc. there is no the specific assembly method of double combination casing in data.
Summary of the invention
In order to solve the problems in the existing technology, it is double-deck group be threadedly coupled that the present invention, which provides a kind of inner layer sleeve,
Cannula structure and its assembly method are closed, single casing completes the assembly of double combination casing in factory, and drilling team's operation field only needs
Internal screw thread box cupling connector is quickly connect with external screw thread box cupling connector, ensure that safe, efficient, fast setting of casing is made
Industry process；Using bilayer sleeve, collapsoing strength is high, and inner layer sleeve is hardly damaged.
To achieve the goals above, the technical solution adopted by the present invention is that, inner layer sleeve is the bilayer combination being threadedly coupled
Cannula structure, including internal screw thread box cupling connector and external screw thread box cupling connector, outer layer sleeve and inner layer sleeve；The both ends of inner layer sleeve
Connection screw thread is set, and connection screw thread is arranged in the first end of outer layer sleeve, and second end tube wall is smooth；The first of internal screw thread box cupling connector
End is provided with the internal screw thread for connecting external screw thread box cupling connector, and the first end of external screw thread box cupling connector is provided in connecting
The external screw thread of threaded collar joint connector；
The second end of internal screw thread box cupling connector is provided with the casing connection for being separately connected inner layer sleeve and outer layer sleeve
Internal screw thread；The second end of external screw thread box cupling connector is provided with the inner layer sleeve connection screw thread for connecting inner layer sleeve, external screw thread
The exterior bayonet slot for connecting outer layer sleeve second end is arranged in the outside of box cupling connector second end.
Clearance fit between the second end inner wall of outer layer sleeve and the exterior bayonet slot of external screw thread box cupling connector, the end of outer layer sleeve
Face is welded and fixed with exterior bayonet slot.
It is stepped thread that described sleeve pipe, which connects internal screw thread, and casing connection internal screw thread includes inner layer sleeve screw thread and outer layer jacket
Pipe screw thread.
The length of outer layer sleeve is less than the length of inner layer sleeve.
There is annular clearance between outer layer sleeve and inner layer sleeve.
The length of described sleeve pipe connection internal screw thread is greater than the reach opened up on outer layer sleeve and inner layer sleeve.
The assembly of the assembly method of pipe in pipe casing of the present invention, single bilayer sleeve is as follows:
One end of inner layer sleeve is connect with internal screw thread box cupling connector；
One end of outer layer sleeve is connect with internal screw thread box cupling connector；
The other end of inner layer sleeve is connect with external screw thread box cupling joint screw thread；
The exterior bayonet slot of the second end connection external screw thread box cupling connector of outer layer sleeve.
The assembly method of bunch tube is that the internal screw thread of internal screw thread box cupling connector and the external screw thread of external screw thread box cupling connector cooperate
Connection；Single bilayer sleeve is prefabricated in the factory, and bunch tube assembles at the construction field (site).
Compared with prior art, what the present invention at least had the advantages that single bilayer sleeve is assembled in production work
Factory carries out, and ensure that the precision and quality reliability of assembly: the both ends of inner layer sleeve are all made of the mode and box cupling of threaded connection
It is connected, the sealing performance of bilayer sleeve has been effectively ensured；The side of outer layer sleeve is connected through a screw thread to be connected with internal screw thread box cupling,
The other side is by welding or the mode of interference fit is connected with external screw thread box cupling, and ensure that outer layer sleeve and box cupling has
Effect connection, improves the tensile strength of bilayer sleeve, ensure that bonding strength of casing during entering well construction；Field operation
When, internal screw thread box cupling connector and external screw thread box cupling connector are closely connected using screw thread, and it is identical as conventional setting of casing mode, guarantee
Safe and efficient, timely casing job；In addition, the seal chamber that the annular clearance between inner layer sleeve and outer layer sleeve is formed
Floating effect, increases the drain volume of casing, effectively reduces the buoyant weight of bunch tube, be conducive to the bunch tube of horizontal section wellbore
Between two parties, subsequent well cementing operation quality is improved；Using double-layer sleeve structure of the invention, collapsoing strength is high, and outer layer sleeve is internal
Layer casing plays the role of being effectively protected, and inner layer sleeve is hardly damaged.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention,
Fig. 2 is internal screw thread box cupling joint structure schematic diagram of the invention,
Fig. 3 is external screw thread box cupling joint structure schematic diagram of the invention,
Fig. 4 is outer layer sleeve structural schematic diagram of the invention,
Fig. 5 is inner layer sleeve structural schematic diagram of the invention,
Fig. 6 is that outer layer sleeve and external screw thread box cupling weld of the invention are tightly connected schematic diagram.
Fig. 7 is outer layer sleeve and the close connection schematic diagram of external screw thread box cupling connector of the invention；
In attached drawing, 1- internal screw thread box cupling connector, 2- external screw thread box cupling connector, 3- outer layer sleeve, 4- inner layer sleeve, 5- weldering
Seam, 11- internal screw thread, 12- inner layer sleeve screw thread, 13- outer layer sleeve screw thread, 21- external screw thread, 22- inner layer sleeve connection screw thread,
23- exterior bayonet slot.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings:
As shown in fig. 1~fig. 5, inner layer sleeve is the pipe in pipe casing being threadedly coupled, including internal screw thread box cupling connects
First 1 and external screw thread box cupling connector 2, outer layer sleeve 3 and inner layer sleeve 4；Connection screw thread, outer layer jacket is arranged in the both ends of inner layer sleeve 4
Connection screw thread is arranged in the first end of pipe 3, and second end tube wall is smooth；The first end of internal screw thread box cupling connector 1 is provided with for connecting
The internal screw thread 11 of external screw thread box cupling connector 2, the first end of external screw thread box cupling connector 2 are provided with for connecting internal screw thread box cupling connector
1 external screw thread 21；The second end of external screw thread box cupling connector 2 is provided with the inner layer sleeve connection screw thread for connecting inner layer sleeve 4
22, the exterior bayonet slot 23 for connecting 3 second end of outer layer sleeve is arranged in the outside of 2 second end of external screw thread box cupling connector.
Casing connection internal screw thread includes inner layer sleeve screw thread 12 and outer layer sleeve screw thread 13, the central diameter of inner layer sleeve screw thread 12
Less than the central diameter of outer layer sleeve screw thread 13, inner layer sleeve screw thread 12 and outer layer sleeve screw thread 13 form the internal screw thread box cupling connector
Stepped thread in 1.
As depicted in figs. 1 and 2, the second end of internal screw thread box cupling connector 1 is provided with for being separately connected inner layer sleeve 4 and outer
The casing connection internal screw thread of layer casing 3；Casing connection internal screw thread is stepped thread, and casing connection internal screw thread includes inner layer sleeve
Screw thread 12 and outer layer sleeve screw thread 13.
As shown in fig. 6, gap between the second end inner wall of outer layer sleeve 3 and 23 surface of exterior bayonet slot of external screw thread box cupling connector
Cooperation, the end face of outer layer sleeve 3 is welded and fixed and seals with exterior bayonet slot 23；Weld seam 5 is formed, is gap-matched and is easily assembled,
It is high in machining efficiency.
As shown in fig. 7, can also between the second end inner wall of outer layer sleeve 3 and 23 surface of exterior bayonet slot of external screw thread box cupling connector
Using interference fit connection and sealing；When using interference fit, inner layer sleeve and outer layer sleeve and external screw thread box cupling connector 2 are realized
Disposable connection is completed simultaneously.
As shown in figures 1 to 6, the length of outer layer sleeve 3 is less than the length of inner layer sleeve 4；Outer layer sleeve 3 and inner layer sleeve
There is annular clearance between 4；The internal screw thread length of internal screw thread box cupling connector 1 is greater than the spiral shell opened up on outer layer sleeve 3 and inner layer sleeve 4
Line length.
The assemble sequence of single bilayer sleeve is successively are as follows:
The external screw thread of 4 one end of inner layer sleeve is connect with the inner layer sleeve screw thread 12 of internal screw thread box cupling connector 1；
The external screw thread of 3 first end of outer layer sleeve is connect with the outer layer sleeve screw thread 13 of internal screw thread box cupling connector 1；
The external screw thread of 4 other end of inner layer sleeve is connect with the inner layer sleeve connection screw thread 22 of external screw thread box cupling connector 2, with
The screw-in that inner layer sleeve 4 is threadedly coupled, the exterior bayonet slot 23 of the second end insertion external screw thread box cupling connector 2 of outer layer sleeve 3；
The second end of outer layer sleeve 3 is connect with the exterior bayonet slot 23 of external screw thread box cupling connector 2: when the second end of outer layer sleeve 3
When being clearance fit between inner wall and 23 surface of exterior bayonet slot of external screw thread box cupling connector, the end face of outer layer sleeve 3 and exterior bayonet slot 23
It is welded and fixed；When the second end inner wall of outer layer sleeve 3 and 23 surface of exterior bayonet slot are interference fit, by being interference fitted directly handle
The second end of outer layer sleeve 3 is fixed on external screw thread box cupling connector 1.
When the external screw thread of 4 other end of inner layer sleeve connect knot with the inner layer sleeve connection screw thread 22 of external screw thread box cupling connector 2
Shu Shi, between outer layer sleeve second end end face and the exterior bayonet slot 23 of external screw thread box cupling connector using welding by the way of be attached with it is close
Envelope.
The assembly method of bunch tube is the internal screw thread 11 of internal screw thread box cupling connector 1 and the external screw thread of external screw thread box cupling connector 2
21 are connected through a screw thread.
There are annular clearances between inner layer sleeve 4 and outer layer sleeve 3 after the assembly is completed, form seal chamber.
Structure as shown in Figure 1 is matched between outer layer sleeve second end inner wall and the exterior bayonet slot 23 of external screw thread box cupling connector 2 for gap
It closes, gap value 0.4-0.8mm；Annular clearance between inner layer sleeve 4 and outer layer sleeve 3 is 3-10mm；As shown in Figure 1, outer layer
Casing 3 is 50-100mm shorter than the length of inner layer sleeve 4.
The double combination casing being assembled to form by above embodiment is assembled in production work due to single bilayer sleeve
Factory carries out, and ensure that the precision and quality reliability of assembly: the both ends of inner layer sleeve 4 be all made of the mode of threaded connection respectively with
Internal screw thread box cupling connector 1 is connected with external screw thread box cupling connector 2, and the sealing performance of bilayer sleeve has been effectively ensured；Outer layer sleeve 3
One end is connected by screw thread with internal screw thread box cupling connector 1, and the other end is by welding or the mode being interference fitted and outer spiral shell
Line box cupling connector 2 is connected, and ensure that effective connection of outer layer sleeve 3 Yu casing coupling connector, improves the tension of bilayer sleeve
Intensity ensure that bonding strength of casing during entering well construction.When field operation, internal screw thread box cupling connector 1 and external screw thread
Box cupling connector 2 is closely connected using screw thread, identical as conventional setting of casing mode, ensure that safe and efficient, timely setting of casing
Operation；In addition, the seal chamber floating effect that the annular clearance between inner layer sleeve 4 and outer layer sleeve 3 is formed, increases the row of casing
Liquid product, effectively reduces the buoyant weight of bunch tube, the bunch tube for being conducive to horizontal section wellbore is placed in the middle, improves subsequent well cementing operation
Quality；Using double-layer sleeve structure of the invention, collapsoing strength is high, and outer layer sleeve 3 plays inner layer sleeve 4 and work is effectively protected
With inner layer sleeve 4 is hardly damaged.
Claims (8)
1. inner layer sleeve is the pipe in pipe casing being threadedly coupled, which is characterized in that including internal screw thread box cupling connector (1) and
External screw thread box cupling connector (2), outer layer sleeve (3) and inner layer sleeve (4)；Connection screw thread, outer layer is arranged in the both ends of inner layer sleeve (4)
Connection screw thread is arranged in the first end of casing (3), and second end tube wall is smooth；The first end setting of internal screw thread box cupling connector (1) is useful
In the internal screw thread (11) of connection external screw thread box cupling connector (2), the first end of external screw thread box cupling connector (2) is provided in connecting
The external screw thread (21) of threaded collar joint connector (1)；
The second end of internal screw thread box cupling connector (1) is provided with the casing for being separately connected inner layer sleeve (4) and outer layer sleeve (3)
Connect internal screw thread；The second end of external screw thread box cupling connector (2) is provided with the connection spiral shell of the inner layer sleeve for connecting inner layer sleeve (4)
The exterior bayonet slot for connecting outer layer sleeve (3) second end is arranged in line (22), the outside of external screw thread box cupling connector (2) second end
(23)。
2. inner layer sleeve according to claim 1 is the pipe in pipe casing being threadedly coupled, which is characterized in that outer layer
Clearance fit between the second end inner wall of casing (3) and the exterior bayonet slot (23) of external screw thread box cupling connector, the end face of outer layer sleeve (3)
It is welded and fixed with exterior bayonet slot (23).
3. inner layer sleeve according to claim 1 is the pipe in pipe casing being threadedly coupled, which is characterized in that described
Casing connection internal screw thread is stepped thread, and casing connection internal screw thread includes inner layer sleeve screw thread (12) and outer layer sleeve screw thread
(13)。
4. inner layer sleeve according to claim 1 is the pipe in pipe casing being threadedly coupled, which is characterized in that outer layer
The length of casing (3) is less than the length of inner layer sleeve (4).
5. inner layer sleeve according to claim 1 is the pipe in pipe casing being threadedly coupled, which is characterized in that outer layer
There is annular clearance between casing (3) and inner layer sleeve (4).
6. inner layer sleeve according to claim 1 is the pipe in pipe casing being threadedly coupled, which is characterized in that described
The length of casing connection internal screw thread is greater than the reach opened up on outer layer sleeve (3) and inner layer sleeve (4).
7. the assembly method of pipe in pipe casing described in any one of claim 1~6, which is characterized in that single bilayer
The assembly of casing is as follows:
One end of inner layer sleeve (4) is connect with internal screw thread box cupling connector (1)；
One end of outer layer sleeve (3) is connect with internal screw thread box cupling connector (1)；
The other end of inner layer sleeve (4) is threadedly coupled with external screw thread box cupling connector (2)；
The exterior bayonet slot (23) of the second end connection external screw thread box cupling connector of outer layer sleeve (3).
8. the assembly method of pipe in pipe casing according to claim 7, which is characterized in that the assembly side of bunch tube
Formula is that the internal screw thread (11) of internal screw thread box cupling connector (1) and the external screw thread (21) of external screw thread box cupling connector (2) are cooperatively connected；It is single
Bilayer sleeve is prefabricated in the factory, and bunch tube assembles at the construction field (site).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910652402.2A CN110439478B (en) | 2019-07-18 | 2019-07-18 | Double-layer combined sleeve structure with inner-layer sleeve in threaded connection and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910652402.2A CN110439478B (en) | 2019-07-18 | 2019-07-18 | Double-layer combined sleeve structure with inner-layer sleeve in threaded connection and assembling method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110439478A true CN110439478A (en) | 2019-11-12 |
| CN110439478B CN110439478B (en) | 2022-03-29 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910652402.2A Active CN110439478B (en) | 2019-07-18 | 2019-07-18 | Double-layer combined sleeve structure with inner-layer sleeve in threaded connection and assembling method thereof |
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