CN213392095U - Well cementing device - Google Patents
Well cementing device Download PDFInfo
- Publication number
- CN213392095U CN213392095U CN202021609550.0U CN202021609550U CN213392095U CN 213392095 U CN213392095 U CN 213392095U CN 202021609550 U CN202021609550 U CN 202021609550U CN 213392095 U CN213392095 U CN 213392095U
- Authority
- CN
- China
- Prior art keywords
- wall
- sleeve
- sealing
- casing
- central
- 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.)
- Active
Links
Images
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The application discloses well cementation device includes: a central sleeve; the outer sleeve is sleeved outside the central sleeve, an annular space is formed between the outer sleeve and the central sleeve, the outer sleeve is not contacted with the central sleeve, and a cement sheath is molded by casting between the outer wall of the outer sleeve and the inner wall of the borehole; the two ends of the outer sleeve are respectively connected with the outer wall of the central sleeve in a sealing way through the sealing assembly; and the heat insulation layer is arranged in the annular space. The space is reserved for expansion and deformation of the central casing in the annular space, the influence of expansion of the central casing on the outer casing under the action of high internal pressure is effectively eliminated, the problem that micro gaps are generated due to plastic deformation of the inner wall of the cement sheath is further solved, severe temperature drop of the shaft bottom is isolated through a heat insulation layer in the annular space, and the problem that the micro gaps are generated due to the fact that deformation of the outer casing and the cement sheath is not coordinated due to severe temperature drop of the shaft bottom is effectively solved.
Description
Technical Field
The utility model relates to a well cementation technical field, in particular to well cementation device.
Background
In the development of oil and gas wells, cementing is an important operation in the drilling process, and refers to a construction operation of lowering a casing into a well and injecting cement into an annular space between the well and the casing. The straight well section is mostly a steel-to-steel well completion structure, namely, an inner casing and an outer casing are adopted, an inner cement sheath is formed between the two casings by pouring, and an outer cement sheath is formed between the outer casing and a well hole by pouring. Due to the fact that the difference of thermodynamic coefficients of the casing and the cement sheath is large, transient temperature drop in the shaft can enable the cementing surface on the inner side of the cement sheath to bear large temperature stress, and cementing failure of an interface of the inner cement sheath is caused. Thereby causing great damage to the integrity of the shaft of the oil and gas well and seriously affecting the normal production of the oil and gas well.
Therefore, how to reduce the influence of higher internal pressure of a shaft and bottom hole temperature drop on the interface sealing performance of the cement sheath in the fracturing or gas injection process becomes a problem to be solved by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a well cementation device to reduce the higher pit shaft internal pressure in fracturing or gas injection process, the influence of shaft bottom temperature drop to cement sheath interface leakproofness.
In order to achieve the above purpose, the utility model provides the following technical scheme:
a cementing apparatus comprising:
a central sleeve;
the outer sleeve is sleeved outside the central sleeve, an annular space is formed between the outer sleeve and the central sleeve, the outer sleeve is not contacted with the central sleeve, and a cement sheath is molded by casting between the outer wall of the outer sleeve and the inner wall of the borehole;
the two ends of the outer sleeve are respectively connected with the outer wall of the central sleeve in a sealing way through the sealing assembly;
and the heat insulation layer is arranged in the annular space.
Preferably, in the above well cementing device, the heat insulation layer is a heat insulation material sleeved on the outer wall of the central casing pipe and/or a heat insulation coating sprayed on the inner wall of the outer casing pipe and/or gas or foam filled in the annular space.
Preferably, in the above well cementing device, a distance between an outer wall of the center casing and an inner wall of the outer casing is a sum of a thickness of the thermal insulation layer and an amount of expansion deformation of the center casing.
Preferably, in the above-described cementing apparatus, the seal assembly comprises:
the sealing rubber cylinder is hermetically nested between the inner wall of the end part of the outer sleeve and the outer wall of the central sleeve;
the sealing end cover, the outer wall of sealing end cover is provided with annular platform, sealing end cover's one end sealing connection in the inner wall of outer tube, just sealing end cover's tip with the tip extrusion seal of packing element, annular platform with the spacing butt of tip of outer tube.
Preferably, in the above-mentioned well cementation device, the inner wall of the end of the outer sleeve is provided with a limit table, and the end of the sealing rubber cylinder is limited by the limit table in a sealing manner.
Preferably, in the above-mentioned well cementing device, the outer casing is formed by sequentially connecting a plurality of segmented outer casings in an axial direction, every two adjacent segmented outer casings are hermetically connected by a connecting sealing pipe, and the sealing rubber cylinder is hermetically nested between the inner wall of the connecting end of each two adjacent segmented outer casings and the outer wall of the central casing.
Preferably, in the above-described cementing apparatus, an outer wall of the connecting seal pipe is provided with a world ball.
Preferably, in the above well cementation device, the outer wall of the end cover is provided with a plurality of centering bars, and an included angle is formed between the centering bars and the axial direction of the end cover.
Preferably, in the above-mentioned well cementing device, the seal end cap and the outer sleeve, and the connection seal pipe and the segmented outer sleeve are in thread sealing connection.
Preferably, in the above-mentioned well cementing device, the central casing, the outer casing, the end cap and the connecting sealing pipe are all steel pipes.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a well cementation device, which comprises a central sleeve, an outer sleeve, a sealing component and a heat insulation layer; the outer sleeve is sleeved outside the central sleeve, an annular space is formed between the outer sleeve and the central sleeve, the outer sleeve is not contacted with the central sleeve, and a cement sheath is molded by casting between the outer wall of the outer sleeve and the inner wall of a borehole; two ends of the outer sleeve are respectively connected with the outer wall of the central sleeve in a sealing way through a sealing component; the insulating layer sets up in the annular space. The well cementing device is put into a well, a cement sheath is cast and molded between the outer wall of an outer sleeve and the inner wall of a well hole, an annular space is reserved between a central sleeve and the outer sleeve, the central sleeve is not contacted with the outer sleeve, two ends of the outer sleeve are connected with the outer wall of the central sleeve in a sealing mode through sealing components, the annular space reserves a space for expansion and deformation of the central sleeve, the influence of expansion of the central sleeve on the outer sleeve under the action of high internal pressure is effectively eliminated, the problem that micro gaps are generated due to plastic deformation of the inner wall of the cement sheath is solved, a heat insulation layer is arranged in the annular space between the central sleeve and the outer sleeve, severe temperature drop at the bottom of the well is isolated through the heat insulation layer under the condition that the thickness of the outer sleeve is not influenced, and the problem that the micro. Thereby reducing the influence of higher internal pressure of a shaft and bottom hole temperature drop on the interface sealing performance of the cement sheath in the fracturing or gas injection process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic longitudinal structural diagram of a well cementing device provided by an embodiment of the present invention;
fig. 2 is a schematic transverse cross-sectional view of a well cementing device provided by the embodiment of the present invention.
Wherein, 1 is the center sleeve, 2 is seal assembly, 21 is the end cover, 22 is the packing rubber section of thick bamboo, 3 is the outer tube, 31 is the segmentation outer tube, 4 is the cement sheath, 5 is the annular space, 6 is connecting sealed tube, 7 is universal ball, 8 is righting the strip.
Detailed Description
The core of the utility model is to provide a well cementation device has reduced the higher pit shaft of fracturing or gas injection in-process and has pressed, the influence of shaft bottom temperature drop to cement sheath interface leakproofness.
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.
Referring to fig. 1 and 2, an embodiment of the present invention provides a well cementing device, including a central casing, an outer casing, a sealing assembly, and a thermal insulation layer; the outer sleeve is sleeved outside the central sleeve, an annular space is formed between the outer sleeve and the central sleeve, the outer sleeve is not contacted with the central sleeve, and a cement sheath is molded by casting between the outer wall of the outer sleeve and the inner wall of a borehole; two ends of the outer sleeve are respectively connected with the outer wall of the central sleeve in a sealing way through a sealing component; the insulating layer sets up in the annular space.
The well cementing device is put into a well, a cement sheath is cast and molded between the outer wall of the outer casing and the inner wall of a well hole, because the annulus is left between the central sleeve and the outer sleeve, the central sleeve is not contacted with the outer sleeve, and the two ends of the outer sleeve are hermetically connected with the outer wall of the central sleeve through the sealing component, the annulus forms a sealed annulus, the annular space reserves a space for the expansion and deformation of the central casing, effectively eliminates the influence of the expansion of the central casing under the action of high internal pressure on the outer casing, thereby solving the problem that the plastic deformation of the inner wall of the cement sheath generates micro-gap, and a heat insulation layer is arranged in the annular space between the central sleeve and the outer sleeve, under the condition of not influencing the thickness of the outer sleeve, the severe temperature drop of the well bottom is isolated by the heat insulation layer, the influence on the temperature of the outer sleeve is reduced, and the problem that the micro-gap is generated due to the fact that the deformation of the outer sleeve and the deformation of the cement sheath are not coordinated due to the severe temperature drop of the well bottom is effectively solved. Thereby reducing the influence of higher internal pressure of a shaft and bottom hole temperature drop on the interface sealing performance of the cement sheath in the fracturing or gas injection process.
In this embodiment, the thermal insulation layer may be a thermal insulation material sleeved on the outer wall of the central sleeve, and/or a thermal insulation coating sprayed on the inner wall of the outer sleeve, and/or a gas or foam filled in the annular space. Specifically, the heat insulation layer can be a heat insulation material alone, the heat insulation material has low heat conductivity, the heat insulation material is sleeved on the central sleeve so as to block temperature drop transmitted from the central sleeve, and the heat insulation material can be asbestos cloth and the like. Or the heat insulation layer can be a heat insulation coating independently, the heat insulation coating is sprayed on the inner wall of the outer sleeve, and the heat insulation coating can be a ceramic heat insulation coating or the like. Or the heat insulation layer can be gas or foam filled in the annular space. Or the heat insulation layer can be in any combination of the three forms. As long as can realize the thermal-insulated between central sleeve pipe and the outer tube, and reserve the inflation deformation space of central sleeve pipe can.
Further, in the present embodiment, the minimum distance between the outer wall of the central sleeve and the inner wall of the outer sleeve is the sum of the thickness of the thermal insulation layer and the amount of expansion deformation of the central sleeve. In order to reduce the micro-gap generated by deformation between the outer wall of the outer sleeve and the inner wall of the cement sheath, the inner and outer sizes of the outer sleeve are required to be ensured not to change, and the central sleeve can expand and deform due to high pressure in the sleeve and invades the space of the annulus.
Because the size of the coupling connected with the outer wall of the outer sleeve is fixed, and the outer diameter of the central sleeve is a standard value generally, the thickness of the outer sleeve can be determined according to the space between annuluses, and when the annulus adopts the minimum space, the thickness of the outer sleeve is the maximum value, so that the structural strength of the outer sleeve is improved. Taking a 139.7mm center sleeve as an example, the inner diameter of the coupling size is 6.9mm larger than the outer diameter of the center sleeve, that is, the outer diameter of the outer sleeve is 6.9mm larger than the outer diameter of the center sleeve, and when the heat insulating layer is a heat insulating material of 0.5mm thickness sheathed on the outer wall of the center sleeve, the expansion deformation amount of the center sleeve 1 is less than 0.1mm under 70MPa, and therefore, the distance between the outer sleeve and the center sleeve is the sum of the thickness of the heat insulating material and the expansion deformation amount of the center sleeve, that is, 0.6mm, the thickness of the outer sleeve is 6.9mm minus 0.6mm, and the result is 6.3 mm. In addition, when the heat insulation layer is foam or air filled in the annular space or a heat insulation coating sprayed on the inner wall of the outer sleeve, the distance between the outer sleeve and the central sleeve 1 can be reduced to 0.1mm, the thickness of the outer sleeve 3 can be increased to 6.8mm, and the purpose of increasing the size selection range of the outer sleeve is achieved.
As shown in fig. 1, in the present embodiment, the seal assembly includes a packing rubber cartridge and a seal end cap; the sealing rubber cylinder is hermetically nested between the inner wall of the end part of the outer sleeve and the outer wall of the central sleeve, and the two ends of the annular space are blocked by the sealing rubber cylinder, and the sealing rubber cylinder can be a sealing element made of rubber such as butadiene-acrylonitrile rubber; the sealing end cover is of an annular structure and is sleeved on the outer wall of the central sleeve, an annular table is arranged on the outer wall of the sealing end cover, one end of the sealing end cover is connected to the inner wall of the outer sleeve in a sealing mode, the end portion of the sealing end cover is connected with the end portion of the sealing rubber barrel in an extrusion sealing mode, and the annular table is in limit butt joint with the end portion of the outer sleeve. And the sealing rubber sleeve is fixed on the inner wall of the end part of the outer sleeve in a pressing and sealing manner through the sealing end cover.
Specifically, the tip inner wall of outer tube is provided with spacing platform, and the tip of packing element is sealed spacing with spacing platform, carries out the axis through spacing platform to the packing element spacing, and through the squeezing action of end cover and spacing platform, messenger's packing element radial expansion pastes closely in the outer wall of center sleeve pipe and the inner wall of outer tube, improves the leakproofness.
In this embodiment, the outer tube is formed by connecting a plurality of segmentation outer tubes along the axial in proper order, all through connecting sealed tube sealing connection, specific accessible threaded connection between every two adjacent segmentation outer tubes, and sealed nestification has sealed packing element between the link inner wall of every two adjacent segmentation outer tubes and the outer wall of center sleeve pipe. The inner walls of the two ends of the segmented outer sleeve are provided with limiting tables, and the two ends of the sealing rubber tube are respectively abutted against the limiting tables and the end part of the connecting sealing tube. Because the outer tube is connected by a plurality of segmentation outer tube, consequently, can select a plurality of segmentation sleeve pipes to connect gradually and form the outer tube according to the depth of going into the well, make things convenient for the dismouting, and carry out the segmentation separation with the annular space that forms between outer tube and the central casing through connecting sealed tube and sealed packing element to further prevent the gaseous cross flow in the annular space, avoided the influence of gaseous cross flow to cement sheath interface combination.
Further, in the present embodiment, the outer wall of the connecting seal pipe is provided with a universal ball, and the universal ball can be half-embedded in the outer wall of the connecting seal pipe and can roll in any direction. Through the rolling friction between the universal ball and the inner wall of the well hole, the well cementing device can be smoothly lowered.
Furthermore, in this embodiment, the outer wall of the end cap is provided with a plurality of centering bars, and an included angle is formed between the centering bars and the axial direction of the end cap, and particularly preferably 45 °. So set up, both guaranteed the centering degree of well cementation device, the structure of righting the strip slope simultaneously is favorable to guaranteeing the washing efficiency of outer tube to improve the cementing strength of well cementation device and cement sheath.
In this embodiment, center sleeve pipe, outer tube, end cover and connection sealed tube are the steel pipe, improve fixing device's structural strength.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A cementing apparatus, comprising:
a central sleeve;
the outer sleeve is sleeved outside the central sleeve, an annular space is formed between the outer sleeve and the central sleeve, the outer sleeve is not contacted with the central sleeve, and a cement sheath is molded by casting between the outer wall of the outer sleeve and the inner wall of the borehole;
the two ends of the outer sleeve are respectively connected with the outer wall of the central sleeve in a sealing way through the sealing assembly;
and the heat insulation layer is arranged in the annular space.
2. The well cementation device of claim 1, wherein the thermal insulation layer is a thermal insulation material sleeved on the outer wall of the center casing and/or a thermal insulation coating sprayed on the inner wall of the outer casing and/or a gas or foam filled in the annular space.
3. The cementing apparatus of claim 1, wherein a distance between an outer wall of the center casing and an inner wall of the outer casing is a sum of a thickness of the thermal insulation layer and an amount of expansion deformation of the center casing.
4. The cementing apparatus of claim 1, wherein the seal assembly comprises:
the sealing rubber cylinder is hermetically nested between the inner wall of the end part of the outer sleeve and the outer wall of the central sleeve;
the sealing end cover, the outer wall of sealing end cover is provided with annular platform, sealing end cover's one end sealing connection in the inner wall of outer tube, just sealing end cover's tip with the tip extrusion seal of packing element, annular platform with the spacing butt of tip of outer tube.
5. The well cementation device of claim 4, wherein the inner wall of the end part of the outer sleeve is provided with a limit table, and the end part of the sealing rubber cylinder is in sealing limit with the limit table.
6. The well cementation device of claim 4, wherein the outer sleeve is formed by sequentially connecting a plurality of segmented outer sleeves along an axial direction, every two adjacent segmented outer sleeves are connected with each other in a sealing manner through a connecting sealing pipe, and the sealing rubber cylinder is nested between the inner wall of the connecting end of each two adjacent segmented outer sleeves and the outer wall of the central sleeve in a sealing manner.
7. The cementing apparatus of claim 6, wherein an outer wall of the connection gland is provided with a world ball.
8. The well cementation device of claim 4, wherein the outer wall of the end cap is provided with a plurality of centralizing strips, and the centralizing strips form an included angle with the axial direction of the end cap.
9. The cementing apparatus of claim 6, wherein the seal end cap and the outer casing and the connection gland and the segmented outer casing are each in a thread-sealing connection.
10. The well cementation device of claim 6, wherein the center casing, outer casing, end cap and connecting seal tube are steel tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021609550.0U CN213392095U (en) | 2020-08-05 | 2020-08-05 | Well cementing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021609550.0U CN213392095U (en) | 2020-08-05 | 2020-08-05 | Well cementing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213392095U true CN213392095U (en) | 2021-06-08 |
Family
ID=76203727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021609550.0U Active CN213392095U (en) | 2020-08-05 | 2020-08-05 | Well cementing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213392095U (en) |
-
2020
- 2020-08-05 CN CN202021609550.0U patent/CN213392095U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213392095U (en) | Well cementing device | |
| CN102720912B (en) | Plastic pipeline expansion piece | |
| CN203628153U (en) | Prestressed vacuum thermal insulation pipe | |
| CN201202903Y (en) | High expansion rate allowance pipe junction seal structure | |
| CN204371211U (en) | A kind of packer sealing structure based on the sealing of metal-rubber cylinder | |
| CN210714497U (en) | Double-layer combined sleeve | |
| CN212337423U (en) | Novel engine exhaust pipe sealing structure | |
| CN111396184A (en) | Novel engine exhaust pipe sealing structure | |
| CN216130897U (en) | Composite super-expansion cementing liner hanger | |
| CN207864829U (en) | A kind of sliceable composite pipe structure of architectural engineering | |
| CN201874517U (en) | Compression type packer sealing cylinder used in oil and gas field | |
| CN211038532U (en) | Threaded connection structure for petroleum pipe | |
| CN216811592U (en) | Novel heat insulation drill rod | |
| CN104295278A (en) | Thermal recovery compensation sealed pipe column | |
| CN103850654B (en) | The manufacture method of the heat insulation tubing and casing of prestressing force | |
| CN207921553U (en) | Groove internal expanding hose coupling | |
| CN101649728B (en) | Connection structure of I-shaped key expansion tube | |
| CN219711461U (en) | Corrosion-resistant high-performance special threaded heat-insulating oil sleeve | |
| CN110905428A (en) | Composite super-expansion cementing liner hanger | |
| CN219472042U (en) | Economical oil casing coupling | |
| CN220151286U (en) | Direct-connection type high-connection-strength petroleum casing pipe | |
| CN219472037U (en) | High-heat-insulation special thread oil sleeve | |
| CN219492223U (en) | Heat-insulating corrosion-proof special oil-buckling sleeve | |
| CN220151278U (en) | Direct-connection double-layer heat-insulating oil sleeve | |
| CN221075568U (en) | Wall bushing structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |