CN209818021U - Casing external insertion butt joint well cementation tool - Google Patents
Casing external insertion butt joint well cementation tool Download PDFInfo
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- CN209818021U CN209818021U CN201920245711.3U CN201920245711U CN209818021U CN 209818021 U CN209818021 U CN 209818021U CN 201920245711 U CN201920245711 U CN 201920245711U CN 209818021 U CN209818021 U CN 209818021U
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- butt joint
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- guide shoe
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Abstract
The utility model relates to a butt joint cementing tool in sleeve pipe extrapolation, including the extrapolation guide shoe, the upper end of extrapolation guide shoe has connect soon through the screw thread and has lengthened a section of thick bamboo, the upper end of lengthening a section of thick bamboo has connect soon through the screw thread and has circulated a section of thick bamboo, be equipped with multirow ash injection hole on the circumference wall in circulation section of thick bamboo middle section, the upper end of circulation section of thick bamboo has connect soon and has sealed a section of thick bamboo, the box thread top of sealed a section of thick bamboo lower extreme is equipped with the sealing washer caulking groove, it is equipped with R type sealing washer and the barb of R type sealing washer inner wall is upwards to inlay in the sealing washer caulking groove, the box thread of sealed a section of thick bamboo upper end has connect soon, the upper end; the inner diameters of the sealing cylinder, the circulating cylinder, the lengthening cylinder and the outer inserting guide shoe are all matched with the outer diameter of the sleeve. The sealing surface of the inner chamfer of the butt joint is bonded with a conical copper sealing gasket. The casing external plugging butt joint well cementing tool is simple in structure, convenient to assemble, low in manufacturing cost, simple in butt joint setting operation and high in sealing reliability.
Description
Technical Field
The utility model relates to an oil development pit shaft overhaul tool especially relates to a butt joint cementing tool in the outer interpolation of sleeve pipe, in the damaged sheathed tube of pit shaft gets and trades the construction for the new butt joint well cementation that leaves the sheathed tube in sleeve pipe that trades into and the pit shaft originally belongs to pit shaft overhaul tool technical field.
Background
Petroleum and natural gas are exploited through a shaft formed by drilling construction, a shaft casing string in a well hole is formed by sequentially screwing casings one by one through threads, the underground environment is more severe along with the increase of the exploitation time of an oil-gas well, the casing is extremely easy to damage, and the damaged casing needs to be replaced when the condition occurs.
In the prior art, the casing is still connected by threads when replaced, and a threaded coupling needs to be reserved for the residual casing in a well. Usually, the damaged casing is taken out through back-off (the casing is connected with threads reversely opened), and then a new casing is put into the damaged casing to be in threaded butt joint with the underground remained old casing; if the original casing pipe is broken, a left-handed thread drilling tool is used for reversing, and the damaged casing pipe at the upper part is fished out firstly. The back-off casing replacing operation has multiple construction steps and complex working procedures, needs a back-off drilling tool and is not suitable for the casing replacing operation of the deep well. This is because, in the casing reversing operation, a reversing drill is usually inserted into the casing for reversing, and the reversing depth is limited due to the small size and low strength of the inserted reversing drill. If a conventional back-off drill is used for back-off, the back-off thread position cannot be accurately determined, and the back-off thread position may be reversed into several sections. If large sleeves are adopted for external insertion and butt joint, the sealing reliability of the butt joint part of the sleeves is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the problem that exists among the prior art, provide a butt joint cementing tool is inserted outward to sleeve pipe, simple structure, the equipment is convenient, low in manufacturing cost, butt joint seat seals easy operation, and sealing reliability is high.
In order to solve the technical problem, the utility model discloses a butt joint cementing tool is inserted outward to sleeve pipe, including the outer guide shoe of inserting, the upper end of outer guide shoe has connect with an extension section of thick bamboo through the screw soon, the upper end of extension section of thick bamboo has connect with a circulation section of thick bamboo through the screw soon, be equipped with the notes ash hole on the circumference wall in circulation section of thick bamboo middle section, the upper end of circulation section of thick bamboo has connect with a sealing cylinder soon, the box thread top of sealing cylinder lower extreme is equipped with the sealing washer caulking groove, it is equipped with R type sealing washer and the barb of R type sealing washer inner wall is upwards to inlay in the sealing washer caulking groove, the box thread of sealing cylinder upper end has connect with the butt joint in the swivelling joint, the upper end of butt joint is equipped with butt joint toper box thread, the lower; the inner diameters of the sealing cylinder, the circulating cylinder, the lengthening cylinder and the outer insertion guide shoe are all matched with the outer diameter of the sleeve.
Compared with the prior art, the utility model discloses following beneficial effect has been obtained: 1. before the butt joint well cementation tool enters a well, an inner cavity of a residual sleeve is blocked by a packer, then the damaged residual sleeve above the packer is cut off and taken out, a milling shoe body is arranged below a drilling tool, and an outer chamfer is milled at the top of the residual sleeve; then the assembly of the butt joint well cementation tool is completed and the butt joint well cementation tool is connected with a floating collar through a butt joint conical female thread, the upper part of the floating collar is connected with a new casing string, and the upper part of the new casing string is connected with a drilling tool; slowly lowering the drilling tool to enable the fish top of the residual casing to smoothly enter the outer inserting guide shoe, continuously lowering the drilling tool to enable the fish top of the residual casing to reach the lengthening cylinder, pumping circulating workover fluid, circulating until the index of the workover fluid is normal, injecting cement slurry, enabling the cement slurry to descend along the center hole of the new casing string to the circulating cylinder, enabling the cement slurry to enter an annular space at the periphery of the casing from a cement injection hole on the circumference of the circulating cylinder, after cement is injected, placing a rubber plug into the casing, pushing the rubber plug to descend by using the workover fluid, and pushing the cement slurry to be discharged from the cement injection hole by the rubber plug; the rubber plug is set when reaching the upper part of the floating hoop; then, the drilling tool is lowered down again, the fish tops of the residual casings sequentially cross the ash injection holes of the circulating cylinder and the R-shaped sealing rings of the sealing cylinder until the external chamfers of the fish tops of the residual casings are embedded with the internal chamfers of the butt joints, and the casings are continuously pressed down by 500kN to realize butt joint and sealing; after cement slurry is solidified for 36 hours, the new casing string completes well cementation. 2. The fish top of the residual sleeve is located cement injection hole below the circulating cylinder, the inner wall of the lengthened cylinder and the outer insertion guide shoe is matched with the outer wall of the residual sleeve at a longer distance, on one hand, the coaxiality of butt joint of the new residual sleeve can be ensured, on the other hand, central positioning is provided for descending of the new sleeve, the new sleeve can be directly placed to realize setting after cement is injected, the fish top of the residual sleeve is prevented from being searched again by the outer insertion guide shoe, and the risk of accidents occurring underground is reduced. 3. Compared with plane butt joint, the embedding of the inner chamfer and the outer chamfer can play a role in guiding and automatic alignment, the reliability of step setting during butt joint of a newly remained sleeve is improved, and the sealing performance of joint of the two is also improved by the lengthened and inclined sealing surface. 4. When the fish top is positioned below the cement injection hole of the circulating cylinder, the inside and the outside of the circulating cylinder are communicated through the cement injection hole, and cement paste can flow downwards along the center of the circulating cylinder and flow upwards along the annular space of the casing after flowing out of the cement injection hole. After cement slurry is injected, the well cementing tool descends, and when the fish top of the residual casing pipe passes over the cement injection hole, the cement injection hole is closed. 5. The utility model discloses a tertiary sealed, the inside and outside chamfer is sealed promptly, R type sealing washer is sealed and the outer cement of sleeve pipe is sealed, has improved sealing performance greatly.
As the improvement of the utility model, the ash injection hole is in be equipped with multirow and every row of evenly distributed on the middle section circumference of a circulation section of thick bamboo have a plurality ofly. The cement paste can be ensured to uniformly enter the annular space and stably rise, and the compactness of the cement at the periphery of the casing pipe is ensured.
As a further improvement of the present invention, the outer periphery of the lower part of the butt joint is provided with a convex butt joint boss, the outer periphery of the lower end of the butt joint is provided with a butt joint male thread, the upper step of the butt joint boss is a tapered step with a thin upper part and a thick lower part, and the lower step of the butt joint boss is a plane; the female thread at the upper end of the sealing cylinder is screwed on the male thread of the butt joint connector, and the upper end opening of the sealing cylinder abuts against the lower part of the step of the boss of the butt joint connector. The toper step on butt joint boss upper portion is convenient for the utility model discloses transfer smoothly or lift in the well, when the last port of a sealed section of thick bamboo supported and leans on the below at the butt joint boss, accomplished the connection promptly, a sealed section of thick bamboo has also obtained axial pinpointing simultaneously.
As a further improvement of the utility model, the inner chamfer angle of the butt joint is 30 degrees included angle with the horizontal plane. The direct embedding of the external chamfer angle of 30 degrees with the fish top of the remaining sleeve or the matching of the external chamfer angle and the external chamfer angle through a copper sealing gasket are facilitated, and the accuracy of the joint is improved.
As a further improvement of the utility model, the lower extreme of outer plug-in guide is equipped with the outer plug-in guide groove of heliciform downwardly extending, the lower extreme of guide groove is equipped with outer plug-in guide groove inner chamfer. The spiral groove and the inner chamfer of the outer inserting guide shoe at the lower end of the outer inserting guide shoe are convenient for the fish top of the residual sleeve to enter the inner cavity of the outer inserting guide shoe.
As a further improvement of the utility model, a conical copper sealing gasket is bonded on the sealing surface of the inner chamfer of the butt joint. The conical copper sealing gasket is positioned between the inner chamfer of the butt joint and the outer chamfer of the fish top of the residual sleeve, deforms after being extruded, and improves the sealing performance of the setting of the inner chamfer and the outer chamfer.
Drawings
Fig. 1 is the structure schematic diagram of the casing external plugging butt joint cementing tool of the utility model.
Fig. 2 is a front view of the butt joint of fig. 1.
Fig. 3 is a front view of the sealing cartridge of fig. 1.
Fig. 4 is a front view of the circulation cylinder of fig. 1.
Fig. 5 is a front view of the outer guide shoe of fig. 1.
In the figure: 1. butt joints; 1a, butting joint conical female threads; 1b, butt joint bosses; 1c, chamfering the inner part of the butt joint; 2. a sealing cylinder; a seal ring type 2 a.R; 3. a circulation cylinder; 3a, injecting ash holes; 4. lengthening the barrel; 5. externally inserting a guide shoe; 5a, externally inserting a guide shoe groove; and 5b, externally inserting the inner chamfer of the guide shoe groove.
Detailed Description
As shown in fig. 1 to 5, the utility model discloses a butt joint well cementation tool is inserted outward to the sleeve pipe includes outer plug-in guide shoe 5, and the lower extreme of outer plug-in guide shoe 5 is equipped with spiral heliciform downwardly extending's outer plug-in guide shoe groove 5a, and the lower extreme of guide shoe groove is equipped with outer plug-in guide shoe groove internal chamfer 5b. The spiral external insertion guide shoe groove 5a and the internal chamfer angle at the lower end of the external insertion guide shoe 5 are convenient for the fish top of the residual sleeve to enter the inner cavity of the external insertion guide shoe 5.
The upper end of the outer inserting guide shoe 5 is screwed with a lengthening cylinder 4 through screw threads, the upper end of the lengthening cylinder 4 is screwed with a circulating cylinder 3 through screw threads, the circumferential wall of the middle section of the circulating cylinder 3 is provided with ash injection holes 3a, and the circumference of the middle section of the circulating cylinder 3 is provided with a plurality of rows of ash injection holes 3a, and each row is uniformly distributed. The upper end of the circulating cylinder 3 is screwed with a sealing cylinder 2, a sealing ring caulking groove is arranged above the female thread at the lower end of the sealing cylinder 2, an R-shaped sealing ring 2a is embedded in the sealing ring caulking groove, an agnail of the inner wall of the R-shaped sealing ring 2a is upward, and a butt joint 1 is screwed in the female thread at the upper end of the sealing cylinder 2.
The upper end of the butt joint 1 is provided with a butt joint conical female thread 1a, the periphery of the lower part of the butt joint 1 is provided with a convex butt joint boss 1b, the periphery of the lower end of the butt joint 1 is provided with a butt joint male thread, the upper step of the butt joint boss 1b is a conical step which is thin at the top and thick at the bottom, the tool can be conveniently and smoothly placed down or lifted up in a well, and the lower step of the butt joint boss 1b is a plane; the female thread at the upper end of the sealing cylinder 2 is screwed on the male thread of the butt joint connector and the upper port of the sealing cylinder 2 is abutted against the lower part of the step of the boss 1b of the butt joint connector. The lower port of the butt joint 1 is provided with a butt joint inner chamfer 1c with a narrow upper part and a wide lower part; the inner chamfer angle 1c of the butt joint forms an included angle of 30 degrees with the horizontal plane. The inner diameters of the sealing cylinder 2, the circulating cylinder 3, the lengthening cylinder 4 and the outer inserting guide shoe 5 are all matched with the outer diameter of the sleeve.
The working process of the casing external plugging butt joint well cementation tool is as follows: before the butt joint well cementation tool enters a well, an inner cavity of a residual sleeve is blocked by a packer, then the damaged residual sleeve above the packer is cut off and taken out, a milling shoe body is arranged below a drilling tool, and an outer chamfer is milled at the top of the residual sleeve; then the assembly of the butt joint well cementation tool is completed and the butt joint well cementation tool is connected with a floating collar through a butt joint conical female thread 1a, the upper part of the floating collar is connected with a new casing string, and the upper part of the new casing string is connected with a drilling tool; slowly lowering the drilling tool to enable the fish top of the residual casing to smoothly enter the outer inserting guide shoe 5, continuously lowering the drilling tool to enable the fish top of the residual casing to reach the lengthening cylinder 4, pumping a circulating workover fluid, circulating until the index of the workover fluid is normal, injecting cement slurry, enabling the cement slurry to descend along the center hole of the new casing string to the circulating cylinder 3, enabling the cement slurry to enter the annular space at the periphery of the casing from the cement injection holes 3a on the circumference of the circulating cylinder 3, after cement is injected, placing a rubber plug into the casing, pushing the rubber plug to descend by using the workover fluid, and pushing the cement slurry to be discharged from the cement injection holes 3a by the rubber plug; the rubber plug is set when reaching the upper part of the floating hoop; then, the drilling tool is lowered again, the fish tops of the residual casings sequentially cross the cement injection holes 3a of the circulating cylinder 3 and the R-shaped sealing rings 2a of the sealing cylinder 2 until the external chamfers of the fish tops of the residual casings are embedded with the internal chamfers 1c of the butt joint joints, and the casings are continuously pressed down for 500kN to realize butt joint and sealing; after cement slurry is solidified for 36 hours, the new casing string completes well cementation.
A tapered copper gasket may be bonded to the sealing surface of the inner chamfer 1c of the butt joint. The conical copper sealing gasket is positioned between the inner chamfer 1c of the butt joint and the outer chamfer of the fish top of the residual sleeve, deforms after being extruded, and improves the sealing performance of the setting of the inner chamfer and the outer chamfer. The well cementation tool realizes three-level sealing, namely inner and outer chamfer sealing, R-shaped sealing ring 2a sealing and casing pipe outer cement sealing, and greatly improves the sealing performance.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention. The undescribed technical features of the present invention can be realized by or using the prior art, and are not described herein again.
Claims (6)
1. The utility model provides a well cementation tool is docked in external plug-in of sleeve pipe, includes plug-in guide shoe, its characterized in that: the upper end of the outer insertion guide shoe is screwed with a lengthening cylinder through threads, the upper end of the lengthening cylinder is screwed with a circulating cylinder through threads, the circumferential wall of the middle section of the circulating cylinder is provided with an ash injection hole, the upper end of the circulating cylinder is screwed with a sealing cylinder, a sealing ring caulking groove is arranged above female threads at the lower end of the sealing cylinder, an R-shaped sealing ring is embedded in the sealing ring caulking groove, a barb on the inner wall of the R-shaped sealing ring faces upwards, a butt joint is screwed in the female threads at the upper end of the sealing cylinder, a tapered female thread of the butt joint is arranged at the upper end of the butt joint, and an inner chamfer of the butt joint with a narrow upper part and a wide lower part; the inner diameters of the sealing cylinder, the circulating cylinder, the lengthening cylinder and the outer insertion guide shoe are all matched with the outer diameter of the sleeve.
2. The casing extrapolation docking cementing tool of claim 1, characterized in that: the ash injection holes are formed in the circumference of the middle section of the circulating cylinder in multiple rows, and multiple ash injection holes are uniformly distributed in each row.
3. The casing extrapolation docking cementing tool of claim 1, characterized in that: the outer periphery of the lower part of the butt joint is provided with a convex butt joint boss, the outer periphery of the lower end of the butt joint is provided with a butt joint male thread, the upper step of the butt joint boss is a tapered step with a thin upper part and a thick lower part, and the lower step of the butt joint boss is a plane; the female thread at the upper end of the sealing cylinder is screwed on the male thread of the butt joint connector, and the upper end opening of the sealing cylinder abuts against the lower part of the step of the boss of the butt joint connector.
4. The casing extrapolation docking cementing tool of claim 1, characterized in that: the inner chamfer angle of the butt joint and the horizontal plane form an included angle of 30 degrees.
5. The casing extrapolation docking cementing tool of claim 1, characterized in that: the lower end of the outer inserting guide shoe is provided with an outer inserting guide shoe groove which extends downwards in a spiral shape, and the lower end of the guide shoe groove is provided with an inner chamfer of the outer inserting guide shoe groove.
6. The casing extrapolation docking cementing tool according to any one of the claims 1 to 5, characterized in that: and a conical copper sealing gasket is bonded on the sealing surface of the inner chamfer of the butt joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920245711.3U CN209818021U (en) | 2019-02-27 | 2019-02-27 | Casing external insertion butt joint well cementation tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920245711.3U CN209818021U (en) | 2019-02-27 | 2019-02-27 | Casing external insertion butt joint well cementation tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209818021U true CN209818021U (en) | 2019-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920245711.3U Active CN209818021U (en) | 2019-02-27 | 2019-02-27 | Casing external insertion butt joint well cementation tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209818021U (en) |
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2019
- 2019-02-27 CN CN201920245711.3U patent/CN209818021U/en active Active
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