CN108397152B - Enclosed oil pipe external cutting device - Google Patents
Enclosed oil pipe external cutting device Download PDFInfo
- Publication number
- CN108397152B CN108397152B CN201810249633.4A CN201810249633A CN108397152B CN 108397152 B CN108397152 B CN 108397152B CN 201810249633 A CN201810249633 A CN 201810249633A CN 108397152 B CN108397152 B CN 108397152B
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- CN
- China
- Prior art keywords
- cutter
- revolving body
- cylinder
- component
- resistance
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- 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.)
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- 238000005520 cutting process Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract 6
- 235000017491 Bambusa tulda Nutrition 0.000 abstract 6
- 241001330002 Bambuseae Species 0.000 abstract 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract 6
- 239000011425 bamboo Substances 0.000 abstract 6
- 239000007787 solid Substances 0.000 abstract 3
- 230000001154 acute effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003245 working effect Effects 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
- E21B29/007—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe with a radially-retracting cutter rotating outside the pipe
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sawing (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
The utility model provides a closed oil pipe external cutting device relates to petroleum machinery technical field, including casing (1) and establish the solid of revolution subassembly in casing (1), be equipped with drive arrangement (2) on casing (1) and be connected with the solid of revolution subassembly through gear (3), it is driven its internal rotation in casing (1), the solid of revolution subassembly is equipped with resistance component and cutting assembly in the section of thick bamboo, resistance component includes resistance section of thick bamboo (4), friction disc (5), compression spring (6) and friction hub (7), cutting assembly includes cutter section of thick bamboo (8), cutter pole (9) and cutter (10), cutter section of thick bamboo (8) are connected with friction hub (7) and rotate along with it, cutter pole (9) one end articulates outside cutter section of thick bamboo (8) and rotates along with cutter section of thick bamboo (8), it has reasonable in design, cutting effect is good, work efficiency is high, safe and reliable's advantage, can be used to workover rig area pressure workover operation, install in area pressure workover operation device high-pressure section, during the use, between two sets of blowout preventors.
Description
Technical Field
The invention relates to the technical field of petroleum machinery, in particular to a closed type oil pipe external cutting device.
Background
The existing annular sealing technology of the pressurized operation device is basically mature and reliable, but the internal blocking technology of a plurality of downhole tools at the bottom of the well is always difficult. The domestic unit develops an operation flow that the retractable spear blanking plug is matched with the totally-enclosed flashboard to pour out the underground tool without internal blockage, and the operation under pressure is completed below the blanking plug at the lowest end; this procedure requires the provision of a tubing port in the high pressure lumen of the apparatus that can be fished and closed on the upper end using a retractable spear blanking plug, which requires the pressurized working device to be able to trip a designated joint in the high pressure lumen of the device or to cut the tubing string directly at the desired location.
Because the upper end of the oil pipe is necessarily in a closed state (otherwise, blowout happens) during the operation under pressure, the traditional oil pipe internal cutter cannot be adopted for cutting operation, and the cutting device can only be arranged in a high-pressure inner cavity of the operation device under pressure to complete the cutting operation.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems, a closed oil pipe external cutting device is provided.
The technical scheme of the invention is as follows: the closed oil pipe external cutting device comprises a shell and a revolving body assembly arranged in the shell, wherein a driving device is arranged on the shell and is connected with the revolving body assembly through a gear to drive the revolving body assembly to rotate in the shell, the revolving body assembly is a cylindrical body, a resistance component and a cutting assembly are arranged in a cylindrical cavity of the revolving body assembly, the resistance component comprises a resistance cylinder, a friction plate, a pressure spring and a friction hub, the resistance cylinder is connected with the shell and is connected with the friction hub through the friction plate, the pressure spring is propped against the friction plate to apply pressure to the resistance cylinder, the cutting assembly comprises a cutter cylinder, a cutter bar and a cutter, the cutter cylinder is provided with a cutter window for the cutter to pass through, the cutter cylinder is connected with the friction hub and rotates along with the cutter cylinder, one end of the cutter bar is hinged outside the cutter cylinder and rotates along with the cutter cylinder, a cutter driving roller is arranged at the middle section of the cutter bar, and the cylindrical cavity wall of the revolving body assembly is provided with a driving slope and is matched with the cutter driving roller to drive the cutter bar to enable the cutter bar to approach to the center position.
The invention has the technical effects that: the hydraulic well repairing device has the advantages of reasonable design, good cutting effect, high working efficiency, safety and reliability, and can be used for well repairing operation of a well repairing machine under pressure, and when in use, the hydraulic well repairing device is arranged in a high-pressure section of the well repairing operation device under pressure and between two groups of blowout preventers.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic view of a cutter and a cutter barrel according to the present invention;
FIG. 3 is a schematic view of the structure of the rotor, cutter and driving ramp thereof according to the present invention;
fig. 4 is a schematic structural view of the cutter return groove of the present invention.
Detailed Description
As shown in fig. 1 to 4, the closed oil pipe external cutting device comprises a shell 1 and a revolving body component arranged in the shell 1, wherein a driving device 2 is arranged on the shell 1 and connected with the revolving body component through a gear 3 to drive the revolving body component to rotate in the shell 1, the revolving body component is a cylindrical body, a resistance component and a cutting component are arranged in a cylinder cavity of the revolving body component, the resistance component comprises a resistance cylinder 4, a friction plate 5, a pressing spring 6 and a friction hub 7, the resistance cylinder 4 is connected with the friction hub 7 through the friction plate 5, the pressing spring 6 is propped against the friction plate 5 to press the friction plate, the cutting component comprises a cutter cylinder 8, a cutter rod 9 and a cutter 10, the cutter cylinder 8 is provided with a cutter window 11 for the cutter 10 to pass through, the cutter cylinder 8 is connected with the friction hub 7 and rotates along with the cutter, one end of the cutter rod 9 is hinged outside the cutter cylinder 8 and rotates along with the cutter cylinder 8, the cutter 10 is arranged at the free end of the cutter rod 9, the middle section of the cutter rod 9 is provided with a cutter driving roller 12, and the cylinder cavity wall of the revolving body component is provided with a driving slope 13 matched with the driving roller 12 to drive the cutter rod 9 to enable the cutter rod 10 to approach to the center position.
The rotary body assembly is characterized in that a cutter return groove 14 is formed in the cylinder cavity wall of the rotary body assembly, a cutter return portion 15 extending into the cutter return groove 14 is arranged on the cutter rod 9, and in the process that the rotary body assembly and the cutter cylinder 8 rotate relatively, the cutter rod 9 is matched with the cutter return portion 15 through the cutter return groove 14 to enable the cutter rod 9 to return. The return mode can also adopt conventional structures such as a return spring and the like.
The rotary body assembly comprises a rotary body upper cover 16, a rotary body 17 and a rotary body lower cover 18, wherein the rotary body upper cover 16, the rotary body 17 and the rotary body lower cover 18 are arranged from top to bottom and are detachably connected together, the resistance component is arranged on the rotary body upper cover 16, the cutting component is arranged on the rotary body 17, the driving slope 13 is arranged on the inner wall of the rotary body 17, and the cutter return groove 14 is arranged on the end face of the rotary body upper cover 16 and/or the rotary body lower cover 18.
The driving device 2 is a hydraulic motor.
The enclosed oil pipe cutter belongs to special equipment in petroleum and natural gas industry, the drilling equipment is of the type with high pressure working cavity in the cavity, and the casing needs to bear the pressure of medium in the well during operation. And cutting off the appointed section of the pipe string in the inner cavity of the high-voltage equipment. The cutting operation is performed by a safety slip of the lower blowout preventer stack, and an upper traveling or fixing slip is required to fix the cut pipe string.
The shell consists of an upper shell, a lower shell and a connecting flange which is arranged on the upper shell and serves as an end cover, a closed inner cavity which can bear pressure is formed, and the connecting flange is fixedly connected with the upper shell through a locking piece. The upper shell and the lower shell are fixed by bolts. The resistance cylinder is connected with the connecting flange through a spline. The outer diameter of the revolving body is provided with teeth, and is connected with a motor through a gear.
The resistance part consists of a friction hub with internal teeth, a resistance cylinder with external teeth, a friction plate lower cover fixed below the resistance cylinder, an external tooth friction plate, an internal tooth friction plate, an external thrust tooth friction plate with a spring assembly groove, a compression spring, a friction plate upper cover pressed on the spring and an elastic retainer ring for holes, and the working property of the resistance part is a set of multi-plate clutch with fixed resistance (see figure 1). The upper teeth of the resistance cylinder are meshed with the connecting flange of the upper shell so as to keep the resistance cylinder not rotating, the lower teeth of the resistance cylinder are meshed with the internal tooth friction plate, and the bottom of the resistance cylinder is fixed with the lower cover of the friction plate through bolts. These parts do not rotate during operation, constituting the stationary components of the clutch.
The upper part of the friction hub is internally provided with threads and a cutting groove, the upper cover of the friction plate is provided with external threads, the spiral compression spring can be compressed after the friction hub is screwed in, and then the hole elastic retainer ring is arranged in the groove of the friction hub so as to limit the highest position of the upper cover of the friction plate and avoid loosening. These portions may be rotated in operation by the cutter assembly, constituting the rotating assembly of the clutch.
The friction area can be changed by adjusting the quantity or the material of the external tooth friction plates and the internal tooth friction plates; by adjusting the size and number of compression springs, the contact pressure between the friction plates can be varied. Two adjustment methods determine the amount of resistive torque provided by the resistive portion.
The inside of the revolving body is provided with a slope cavity structure, a plurality of groups of cutter pushing curves are arranged in the slope cavity, each curve is composed of a slope arc section, a steep slope straight line section (driving slope) and a transitional arc between the slope arc section and the steep slope straight line section, and the back of the steep slope straight line section is a cutter withdrawal pushing section. The steep straight line section forms an acute angle with a straight line passing through the theoretical circle center of the part, and the cutting and feeding actions are completed in the steep straight line section.
During cutting operation, the rotary driving assembly pushes the cutting driving assembly to rotate, at the moment, the whole cutting working assembly does not rotate under the influence of friction resistance of a resistance part in the cutting working assembly, the slope cavity of the revolving body pushes the roller to move towards the circle center, and the cutter bar mounting seat and the cutter arranged at the front end of the cutter bar mounting seat move towards the circle center at a higher speed.
When the cutter point of the cutter is in contact with the surface of the cut pipe column, the contact surface of the slope cavity and the roller is a steep straight line section, and the thrust of the steep straight line section to the roller can be decomposed into two component forces: the thrust to the center of the part and the thrust to the circumferential direction of the contact point are smaller than the thrust to the circumferential direction of the contact point because the steep slope straight line section forms an acute angle with the straight line passing through the theoretical center of the part; because the knife tip of the cutter is blocked by the pipe column and does not advance any more, the driving force of the rotary driving assembly starts to rise until the friction resistance of the resistance part in the cutting working assembly is overcome, and at the moment, the cutter assembly drives the resistance part clutch rotary assembly to start to rotate. The cutter point of the cutter after starting to rotate applies two forces to the cut tubular column at the same time, namely two cutting forces for cutting operation: the thrust to the center of a circle is cutting radial feeding force, the thrust to the circumferential direction of the contact point is main cutting force, the component force of the resistance torque provided by the resistance part in the direction of the center of a circle is minimum cutting radial feeding force of the system, and the residual force of the driving force provided by the rotary driving assembly after overcoming the torque of the resistance assembly is main cutting force.
Claims (4)
1. The closed oil pipe external cutting device comprises a shell (1) and a revolving body component arranged in the shell (1), wherein a driving device (2) is arranged on the shell (1) and connected with the revolving body component through a gear (3), the revolving body component is driven to rotate in the shell (1), the revolving body component is a cylindrical body, a resistance component and a cutting component are arranged in a cylinder cavity of the revolving body component, the resistance component comprises a resistance cylinder (4), a friction plate (5), a pressure spring (6) and a friction hub (7), the resistance cylinder (4) is connected with the shell (1), the resistance cylinder (4) is connected with the friction hub (7) through the friction plate (5), the pressure spring (6) abuts against the friction plate (5) to exert pressure on the friction hub, the cutting component comprises a cutter cylinder (8), a cutter rod (9) and a cutter (10), a cutter window (11) for the cutter rod (10) to pass through is arranged on the cutter cylinder (8), the cutter cylinder (8) is connected with the friction hub (7) and rotates along with the friction hub, one end of the cutter rod (9) is hinged outside the cutter cylinder (8) and rotates along with the cutter cylinder (8), a slope surface (12) is arranged at the middle part of the free end of the cutter rod (9), a roller wheel component (9) is matched with a driving part (12), is used for driving the cutter bar (9) to enable the cutter (10) to approach to the center position.
2. The closed type oil pipe external cutting device according to claim 1, wherein a cutter return groove (14) is formed in a cylinder cavity wall of the revolving body assembly, a cutter return part (15) extending into the cutter return groove (14) is formed in the cutter rod (9), and the cutter rod (9) is matched with the cutter return part (15) through the cutter return groove (14) in the process of relative rotation of the revolving body assembly and the cutter cylinder (8) so as to enable the cutter rod (9) to return.
3. The closed type oil pipe external cutting device according to claim 2, wherein the revolving body assembly comprises a revolving body upper cover (16), a revolving body (17) and a revolving body lower cover (18), the revolving body upper cover (16), the revolving body (17) and the revolving body lower cover (18) are arranged from top to bottom and are detachably connected together, the resistance component is arranged on the revolving body upper cover (16), the cutting assembly is arranged on the revolving body (17), the driving slope (13) is arranged on the inner wall of the revolving body (17), and the cutter return groove (14) is arranged on the end face of the revolving body upper cover (16) and/or the revolving body lower cover (18).
4. A closed oil pipe external cutting device according to claim 1, 2 or 3, characterized in that the driving means (2) is a hydraulic motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810249633.4A CN108397152B (en) | 2018-03-26 | 2018-03-26 | Enclosed oil pipe external cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810249633.4A CN108397152B (en) | 2018-03-26 | 2018-03-26 | Enclosed oil pipe external cutting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108397152A CN108397152A (en) | 2018-08-14 |
| CN108397152B true CN108397152B (en) | 2024-02-13 |
Family
ID=63093150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810249633.4A Active CN108397152B (en) | 2018-03-26 | 2018-03-26 | Enclosed oil pipe external cutting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108397152B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115110908B (en) * | 2021-03-23 | 2024-04-05 | 中国石油天然气集团有限公司 | Underground oil pipe pressurized cutting tool and cutting method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006051324A1 (en) * | 2004-11-13 | 2006-05-18 | Hunting Cromar Limited | Device for cutting a downhole object |
| KR100646449B1 (en) * | 2005-12-14 | 2006-11-15 | 한국기초과학지원연구원 | Portable detailed circle cutter |
| CA2928724A1 (en) * | 2013-10-29 | 2015-05-07 | Transocean Innovation Labs, Ltd | Subsea pipe cutting apparatuses and related methods |
| CN204532192U (en) * | 2015-01-23 | 2015-08-05 | 中国石油天然气股份有限公司 | Well head area is pressed to cut and is decomposed drilling tool device |
| CN208267807U (en) * | 2018-03-26 | 2018-12-21 | 杨颖辉 | Device is cut outside closed oil pipe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2311036A1 (en) * | 2000-06-09 | 2001-12-09 | Oil Lift Technology Inc. | Pump drive head with leak-free stuffing box, centrifugal brake and polish rod locking clamp |
-
2018
- 2018-03-26 CN CN201810249633.4A patent/CN108397152B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006051324A1 (en) * | 2004-11-13 | 2006-05-18 | Hunting Cromar Limited | Device for cutting a downhole object |
| KR100646449B1 (en) * | 2005-12-14 | 2006-11-15 | 한국기초과학지원연구원 | Portable detailed circle cutter |
| CA2928724A1 (en) * | 2013-10-29 | 2015-05-07 | Transocean Innovation Labs, Ltd | Subsea pipe cutting apparatuses and related methods |
| CN204532192U (en) * | 2015-01-23 | 2015-08-05 | 中国石油天然气股份有限公司 | Well head area is pressed to cut and is decomposed drilling tool device |
| CN208267807U (en) * | 2018-03-26 | 2018-12-21 | 杨颖辉 | Device is cut outside closed oil pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108397152A (en) | 2018-08-14 |
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