CN210918953U - Composite local reverse circulation sleeve milling barrel - Google Patents
Composite local reverse circulation sleeve milling barrel Download PDFInfo
- Publication number
- CN210918953U CN210918953U CN201921917489.3U CN201921917489U CN210918953U CN 210918953 U CN210918953 U CN 210918953U CN 201921917489 U CN201921917489 U CN 201921917489U CN 210918953 U CN210918953 U CN 210918953U
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- milling
- reverse circulation
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- circulation
- cover
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- 238000003801 milling Methods 0.000 title claims abstract description 85
- 239000002131 composite material Substances 0.000 title claims description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 9
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 9
- 241001330002 Bambuseae Species 0.000 claims abstract description 9
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 9
- 239000011425 bamboo Substances 0.000 claims abstract description 9
- 238000005192 partition Methods 0.000 claims description 25
- 239000012530 fluid Substances 0.000 claims description 20
- 230000000903 blocking effect Effects 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 2
- 238000000151 deposition Methods 0.000 claims 2
- 239000007788 liquid Substances 0.000 abstract description 9
- 239000000428 dust Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 210000000664 rectum Anatomy 0.000 abstract 1
- 239000013049 sediment Substances 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 description 24
- 239000012634 fragment Substances 0.000 description 8
- 238000000227 grinding Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Landscapes
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The utility model discloses a combined type local reverse circulation cover mills a section of thick bamboo for accomodate piece and high-efficient mill when oil gas (water) well workover cover mills. Liquid is guided through a reverse circulation hole formed in the milling sleeve, and positive circulation at the upper part is changed into flowing out from the annular space and entering the milling sleeve, so that reverse circulation is formed; and the scraps are accommodated by a settling cylinder arranged in the cylinder body. The utility model discloses changed and washed for local backwash in the cover milling work progress forward, the external sediment section of thick bamboo of former big latus rectum is built-in, can mill the abrasive dust piece that the in-process produced with the cover smoothly and carry out ground, can avoid risks such as sticking to bore effectively, a safe high-efficient cover milling operation for to the lost circulation well, highly deviated well, collect the cover milling, the abrasive dust piece is dragged for and is got the function in an organic whole, abrasive dust piece clearance effect has been improved, reduce and avoid the cover to mill the emergence of in-process sticking to bore the problem.
Description
Technical Field
The utility model belongs to the technical field of oil gas field development, a salvage the downhole tool of operation in the oil gas (water) well workover engineering, concretely relates to local reverse circulation cover of combined type mills a section of thick bamboo.
Background
The casing milling is the most commonly used method in the well repairing engineering of an oil and gas well, the conventional casing milling at present mostly adopts positive circulation, generated fragments return upwards from the annular space of a casing pipe, the fragments sink and are stacked due to the reasons of flow rate change, buoyancy rise and return distance and the like in the process of returning upwards the fragments, so that a casing milling barrel is blocked, and the method is to adopt a settling cup with a larger caliber and an upward opening at a position close to the casing milling barrel to receive the fragments and reduce the drill sticking. To allow the settling cup to accept debris without leaking back to its lower portion, the outer diameter of the settling cup is often designed to be as close as possible to the inner diameter of the sleeve. However, the large-diameter sedimentation cup greatly increases the risk probability of causing drill sticking, and meanwhile, because the outer diameter of the sedimentation cup is too large, so that large-diameter fragments cannot be returned due to small gaps, patent 201420642589.0 discloses a reverse circulation inner sedimentation cup for well repair operation, which can play a role in maximum by collecting the fragments through positive and reverse well washing and claw fishing, needs large discharge circulation for one week and then reverse circulation, cannot collect the fragments immediately along with the process, and has the problems of long time consumption, incomplete collection of the fragments of grinding chips, low efficiency and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a combined type local reverse circulation shell milling section of thick bamboo is provided, built-in sedimentation cup has been designed to combine the advantage of reverse circulation, make the piece dash away the drill bit fast and leave the shaft bottom along with reverse circulation liquid, get into a sedimentation section of thick bamboo, when being used for the lost circulation well milling very much, can effectively reduce the sticking of a drill risk.
In order to solve the technical problem, the utility model discloses a technical scheme is: a combined type local reverse circulation milling barrel comprises an upper joint, a milling barrel body and a milling shoe which are sequentially connected, wherein a partition plate which divides the milling barrel body into an upper part and a lower part is arranged in a cavity of the milling barrel body; the sedimentation cylinder is a round cylinder with a closed bottom end, the upper end of the sedimentation cylinder is welded with the bottom plate of the partition plate and is fixed in the milling cylinder body of the sleeve, the sedimentation cylinder is close to the partition plate, a plurality of circulation holes are formed in the wall of the sedimentation cylinder, the flow guide pipe is a round hollow pipe and penetrates through the partition plate in the sedimentation cylinder, the bottom end of the flow guide pipe below the partition plate is lower than the circulation holes, and the top end of the flow guide pipe above the partition plate penetrates out of the wall of the milling cylinder body above the reverse circulation hole through the backflow pipe and is communicated with the outer.
Alloy teeth are embedded in the end face and the inner side face of the bottom of the sleeve milling shoe, so that the sleeve milling shoe has a bottom chip grinding and milling function and an internal grinding and milling function.
The milling barrel is formed by multiple sections of barrels connected through screw threads.
The settling cylinder is formed by a plurality of sections of cylinder bodies which are connected through screw threads.
The return flow pipes are four and are inclined upwards and uniformly arranged in the circumferential direction.
The number of the reverse circulation holes is four, the reverse circulation holes are inclined downwards, and the reverse circulation holes are uniformly arranged in the circumferential direction.
The utility model has the advantages that: compared with the existing tool and milling technology, the method has the advantages that the circulating liquid flow is corrected to be local reverse circulation, and the built-in settling cup is used for efficiently cleaning and collecting the debris impurities generated by underground sleeve milling; the chip cleaning effect is improved, and the problem of drill jamming in the sleeve milling process is reduced and avoided.
Drawings
Fig. 1 is a schematic view of the structure of the combined type local reverse circulation milling barrel of the present invention.
Fig. 2 is a schematic structural diagram of a backflow pipe diagram of the top view a of fig. 1.
FIG. 3 is a view of the vertical flow holes of the settling cup shown in the top view B of FIG. 1.
Fig. 4 is a schematic view of the fluid flow direction of the composite type local reverse circulation milling sleeve of the present invention during operation.
In the figure, 1, an upper connector 2, a milling barrel main body 3, a backflow pipe 4, a reverse circulation hole 5, a partition plate 6, a vertical circulation hole 7, a flow guide pipe 8, a settling barrel 9, a milling barrel connecting screw thread 10, a settling barrel connecting screw thread 11, a milling barrel extending barrel 12, a settling barrel extending barrel 13, a milling shoe 14 and grinding debris.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and embodiments:
as shown in fig. 1-4, the composite type local reverse circulation milling sleeve of the present invention comprises an upper joint 1, a milling sleeve 2, and a milling shoe 13, which are connected in sequence, wherein a partition 5 is arranged in a cavity of the milling sleeve 2, and divides the milling sleeve 2 into an upper part and a lower part, and is close to the upper part of the partition 5, and a reverse circulation hole 4 is formed on the wall of the milling sleeve 2, so that under the blocking action of the partition 5, a normal circulation fluid on the upper part flows out from the reverse circulation hole 4 and enters into an outer annular space of the milling sleeve to form reverse circulation; the sedimentation cylinder 8 is a round cylinder with a closed bottom end, the upper end of the sedimentation cylinder is welded with a bottom plate of the partition plate 5 and fixed in the milling cylinder body 2, the sedimentation cylinder is close to the partition plate 5, the wall of the sedimentation cylinder is provided with a plurality of circulation holes 6, the flow guide pipe 7 is a round hollow pipe and penetrates through the partition plate 5 in the sedimentation cylinder 8, the bottom end of the flow guide pipe 7 below the partition plate 5 is lower than the circulation holes 6, and the top end of the flow guide pipe 7 above the partition plate 5 penetrates out of the milling cylinder body 2 cylinder wall above the reverse circulation hole 4 through the return flow pipe 3 and is communicated with the outer annular.
Alloy teeth are embedded in the end face and the inner side face of the bottom of the milling shoe 13, so that the bottom chip milling function and the internal milling function are achieved.
The milling barrel 2 is formed by a plurality of sections of barrels connected through screw threads. The settling cylinder 8 is formed by a plurality of sections of cylinder bodies connected by screw threads.
The number of the backflow pipes 3 is four, the backflow pipes are inclined upwards, and the backflow pipes are uniformly arranged in the circumferential direction. The number of the reverse circulation holes 4 is four, the reverse circulation holes are inclined downwards, and the reverse circulation holes are uniformly arranged in the circumferential direction.
In particular, the upper sub 1 is used for connection to a drill string. A cavity at the lower part of the sleeve milling barrel body 2 is internally provided with a partition plate 5 for changing the flow direction, a reverse circulation hole 4 is formed near the upper part of the partition plate 5, and under the blocking action of the partition plate 5, a positive circulation fluid at the upper part is changed into a positive circulation fluid flowing out of the reverse circulation hole 4 and entering the outer annular space of the sleeve milling barrel to form reverse circulation; the upper part of the cylinder body is provided with a return hole connected with the return pipe 3 to guide the fluid to the annular space.
The baffle 5 is arranged in the cavity of the milling sleeve and has the functions of blocking fluid from an upper pipe column and enabling the positive circulation fluid to enter the outer annulus of the milling sleeve 2 to form reverse circulation; secondly, the fluid with the debris from the lower milling shoe 13 is blocked and the flow direction is changed to make the fluid enter the sedimentation cylinder 8.
Between the milling barrel 2 and the milling shoe 13, a connecting screw thread 9 is provided, which has the function of conveniently installing an internal precipitation barrel extension barrel and a selectively connecting milling barrel extension barrel 11 for milling longer fish.
And the settling cylinder 8 is arranged in the cavity of the milling cylinder and is a round cylinder with a closed bottom end, and the upper end of the settling cylinder is welded with the partition plate 5 and is fixed in the milling cylinder 2. A vertical circulating hole 6 is arranged below the clapboard 5 and is used for returning liquid to enter a settling cylinder 8. Further, a screw thread 10 is arranged below the vertical through hole 6 in the middle section of the sedimentation cylinder 8 and used for selectively connecting an extension cylinder 12 of the sedimentation cylinder so as to lengthen the sedimentation cylinder and contain more chips 14.
The honeycomb duct 7 is arranged in the sedimentation cylinder 8 and is a round hollow pipe, the top end of the honeycomb duct is connected with the return pipe 3 and communicated with the return pipe, the bottom end of the honeycomb duct is a liquid flow inlet, the bottom end inlet needs to be arranged at a certain distance below the vertical circulation hole 6 of the sedimentation cylinder, and the honeycomb duct 7 has the function of changing the direction of the fluid with the abrasive dust debris so as to enable the fluid to flow downwards and sink the abrasive dust 14; and the return liquid separated from the abrasive dust returns to the return pipe 3 from the inside of the return pipe and enters the annular space.
The backflow pipe 3 is arranged in the milling sleeve and is a hollow pipe, the upper part of the backflow pipe is connected with the backflow hole, and liquid enters the annular space; the lower end is communicated with the flow guide pipe 7 and is fixed in the milling sleeve 2 by welding with the partition plate 5.
The technical scheme of the utility model is realized like this:
lowering a local reverse circulation sleeve milling barrel tool provided with sleeve milling tools and the like to a position above a preset sleeve milling position;
the well mouth is connected with a kelly bar, a circulation flow is opened, and a pump is started to start circulation operation;
starting the turntable, slowly pressurizing and starting milling;
fluid enters the tool through the drill rod, and under the blocking action of an inner partition plate of the tool, the positive circulation fluid at the upper part is changed into the positive circulation fluid flowing out of the reverse circulation hole and entering the outer annular space of the milling sleeve to form reverse circulation;
fluid which is milled at the bottom of the shoe and carries scraps flows into the sedimentation cylinder through a vertical circulation hole on the sedimentation cylinder, the flow direction of the fluid is changed to enable the fluid to flow downwards when the fluid meets the outer wall of the flow guide pipe, the scraps are deposited downwards to a storage space at the lower part of the sedimentation cylinder, the scraps are separated from circulating liquid, return liquid without abrasive scraps returns to the return pipe from the interior of the flow guide pipe upwards, and then enters the annular space to rise to the ground;
the tool is lifted out, and the abrasive dust and debris are brought out.
In summary, the present invention is not limited to the above embodiments, and other embodiments can be easily proposed by those skilled in the art within the technical teaching of the present invention, but all such embodiments are included in the scope of the present invention.
Claims (6)
1. A combined type local reverse circulation milling sleeve comprises an upper joint (1), a milling sleeve body (2) and a milling shoe (13) which are sequentially connected, and is characterized in that a partition plate (5) which divides the milling sleeve body (2) into an upper part and a lower part is arranged in a cavity of the milling sleeve body (2), the partition plate is close to the upper part of the partition plate (5), a reverse circulation hole (4) is formed in the wall of the milling sleeve body (2), and under the blocking action of the partition plate (5), a positive circulation fluid on the upper part is changed into a positive circulation fluid which flows out of the reverse circulation hole (4) and enters the outer annular space of the milling sleeve body, so that reverse circulation is formed; deposit a section of thick bamboo (8) and be a bottom confined circular section of thick bamboo, the upper end is connected and fix in shell milling barrel (2) with baffle (5) bottom plate welding, be close to the position of baffle (5), it has a plurality of opening (6) to open on depositing a section of thick bamboo pipe wall, honeycomb duct (7) are a circular empty core pipe, pass baffle (5) in depositing a section of thick bamboo (8), honeycomb duct (7) bottom that is located baffle (5) below is less than opening (6), honeycomb duct (7) top that is located baffle (5) top is worn out shell milling barrel (2) above reverse circulation hole (4) through return flow pipe (3), with shell milling barrel external annulus intercommunication.
2. The combined type local reverse circulation milling barrel as claimed in claim 1, wherein alloy teeth are embedded on the bottom end surface and the inner side surface of the milling shoe (13), and the milling barrel has a bottom chip milling function and an internal milling function.
3. The compound local reverse circulation shell milling drum according to claim 1, characterized in that the shell milling drum (2) is formed by sections of drum connected by screw threads.
4. The compound local reverse circulation shell milling drum according to claim 1, characterized in that the settling drum (8) is formed by a multi-segment drum connected by a screw thread.
5. The combined type local reverse circulation casing milling barrel according to claim 1, wherein the number of the backflow pipes (3) is four, the backflow pipes are inclined upwards, and the backflow pipes are uniformly arranged in the circumferential direction.
6. The composite type local reverse circulation milling sleeve according to claim 5, wherein the number of the reverse circulation holes (4) is four, the reverse circulation holes are inclined downwards and are uniformly arranged in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921917489.3U CN210918953U (en) | 2019-11-08 | 2019-11-08 | Composite local reverse circulation sleeve milling barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921917489.3U CN210918953U (en) | 2019-11-08 | 2019-11-08 | Composite local reverse circulation sleeve milling barrel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210918953U true CN210918953U (en) | 2020-07-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921917489.3U Active CN210918953U (en) | 2019-11-08 | 2019-11-08 | Composite local reverse circulation sleeve milling barrel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210918953U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502656A (en) * | 2020-10-09 | 2021-03-16 | 中国石油集团渤海钻探工程有限公司 | Screw type local reverse circulation milling fishing tool |
| CN115217431A (en) * | 2021-04-19 | 2022-10-21 | 中国石油天然气股份有限公司 | Sleeve milling device |
-
2019
- 2019-11-08 CN CN201921917489.3U patent/CN210918953U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502656A (en) * | 2020-10-09 | 2021-03-16 | 中国石油集团渤海钻探工程有限公司 | Screw type local reverse circulation milling fishing tool |
| CN115217431A (en) * | 2021-04-19 | 2022-10-21 | 中国石油天然气股份有限公司 | Sleeve milling device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210830 Address after: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd. Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd., No. 83, Second Street, economic and Technological Development Zone, Binhai New Area, Tianjin, 300457 Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |
|
| TR01 | Transfer of patent right |