Pipe column righting device of under-pressure operation machine

Abstract

The utility model discloses a pipe column centralizing device of an under-pressure operation machine. The pipe column centralizing device comprises a supporting mechanism, a movable mechanism and an anti-bending mechanism, the supporting mechanism comprises an upper supporting plate and a lower supporting plate which are arranged in parallel at an interval, and the upper supporting plate and the lower supporting plate are connected through a plurality of vertically arranged supporting rods; the movable mechanism comprises a plurality of air cylinders which are vertically arranged between the upper supporting plate and the lower supporting plate in the mode that movable push rods are vertically upward. The anti-bending mechanism comprises a connecting disc and an anti-bending sleeve; the connecting disc is parallel to the upper supporting plate and fixed to the ends of movable push rods of the multiple air cylinders so as to ascend and descend through the multiple air cylinders. The inner diameter of the anti-bending sleeve is matched with the outer diameter of the descending pipe column, and the anti-bending sleeve is sleeved and detachably fixed in the center hole of the connecting disc; the device is matched with a lifting oil cylinder, so that the unsupported length of a lowered pipe column during pipe lowering of the under-pressure operation machine under pressure is reduced, the problems of deformation, burst and the like of the pipe column are effectively avoided, and the operation safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure-operated equipment, in particular to a pipe column straightening device for a pressure-operated machine. Background Art

[0002] During the use of the pressure-operated machine, many working conditions require the equipment to lower the pipe under pressure. At this time, the force on the pipe string is relatively complex and needs to be controlled by slips to prevent the pipe string from flying out. When the equipment is in the pipe lowering condition, the upper floating slips are closed, and the lower annular / gate blowout preventer is closed. The pipe string is in an unsupported state between the slips and the blowout preventer. When the unsupported length exceeds the maximum unsupported length, the pipe string becomes unstable and bends or breaks, causing the pipe string to fly out. At this time, conventional equipment needs to adjust the unsupported length by reducing the stroke of the lifting cylinder, which affects the construction progress and cannot fundamentally solve the problem of unsupported length. Based on this, it is necessary to design a pipe string straightening device that cooperates with the blowout preventer to lower the oil pipe, and achieve the purpose of preventing bending during the lowering process of the pipe string by reducing the unsupported length of the lowered pipe string. Utility Model Content

[0003] The utility model aims to provide a pipe string straightening device for a pressure working machine which solves the above technical problems.

[0004] To this end, the technical solution of the utility model is as follows:

[0005] A pipe string straightening device for a pressure working machine comprises a supporting mechanism, a movable mechanism and an anti-bending mechanism; wherein:

[0006] The support mechanism comprises an upper support plate and a lower support plate which are arranged in parallel and at intervals, an axial through hole with a diameter larger than the outer diameter of the lowered pipe column is opened at the center of the two plates, and a plurality of support rod mounting holes and cylinder mounting holes which are alternately arranged are evenly distributed in the circumferential direction of the outer circumference; a plurality of support rods are vertically arranged between the upper support plate and the lower support plate, and the two ends of each support rod are passed through and fixed in a group of two corresponding support rod mounting holes on the upper support plate and the lower support plate;

[0007] The movable mechanism includes multiple cylinders, which are vertically arranged between the upper support plate and the lower support plate in a manner that the movable push rods are vertically facing upward; the two ends of the cylinder barrels of the multiple cylinders are respectively inserted into a group of upper and lower corresponding multiple cylinder mounting holes of the upper support plate and the lower support plate, and fixed on the upper support plate; the anti-bending mechanism includes a connecting plate and an anti-bending sleeve; the connecting plate is arranged parallel to the upper support plate and fixed to the rod ends of the movable push rods of the multiple cylinders so as to be lifted and lowered by the multiple cylinders; the inner diameter of the anti-bending sleeve is adapted to the outer diameter of the lowered pipe column, and it is sleeved and detachably fixed in the center hole of the connecting plate.

[0008] Furthermore, a connecting cylinder is formed at the center of the bottom surface of the lower support plate and extends axially downward, and a connecting flange matching with the upper flange of the blowout preventer is provided on the outer wall of the bottom end of the connecting cylinder.

[0009] Furthermore, the anti-bending mechanism also includes a supporting plate and a lower pressure cover; wherein, a first outer annular boss is provided on the outer wall at the top end of the anti-bending sleeve, and an annular groove is opened on the lower outer wall; the supporting plate is arranged between the connecting plate and the anti-bending sleeve, and a second outer annular boss is provided on the outer wall at the top end, so that the second outer annular boss is pressed fit on the top surface of the connecting plate, and the first outer annular boss is pressed fit on the top surface of the second outer annular boss; the supporting plate is fixed to the connecting plate by a plurality of bolts evenly distributed along the circumferential direction of the second outer annular boss; the lower pressure cover is composed of a first arc-shaped body and a second arc-shaped body opened in opposite directions, and an inner annular boss is provided on the inner wall at the top end; the lower pressure cover is arranged on the lower side of the anti-bending sleeve in a manner that the two arc-shaped bodies are relatively engaged, and the inner annular boss of the lower pressure cover is embedded and assembled in the annular groove on the outer wall of the anti-bending sleeve; the lower pressure cover is fixed to the connecting plate by a plurality of bolts evenly distributed along the circumferential direction.

[0010] Furthermore, a plurality of anti-bending sleeves are provided, and the plurality of anti-bending sleeves have the same outer diameter and different inner diameters, and the inner diameters of the plurality of anti-bending sleeves are respectively adapted to lowered pipe columns of different sizes.

[0011] Furthermore, the inner wall of the top end of the anti-bending sleeve is processed into an upper transition cone surface whose inner diameter gradually decreases from top to bottom, and the inner wall of the bottom end is processed into a lower transition cone surface whose inner diameter gradually increases from top to bottom.

[0012] Furthermore, two through grooves penetrating the upper and lower end surfaces of the lower pressure cover are symmetrically provided on the outer walls on both sides of the lower pressure cover located on the split line of the lower pressure cover.

[0013] Compared with the prior art, the pipe string straightening device of the pressure-operating machine is installed on the top of the blowout preventer through a supporting mechanism and is arranged in cooperation with the slips. By synchronously lifting and lowering with the upper lifting cylinder, the unsupported length of the pipe string when the pressure-operating machine is lowering the pipe under pressure is reduced, and the risk of lowering the pipe string under pressure is reduced. It can effectively avoid problems such as pipe string deformation and bursting, and improve operation safety. In addition, the anti-bending sleeves of the straightening device are provided with multiple anti-bending sleeves according to the size specifications of the actual lowered pipe string, which can be replaced and assembled as needed, so that the straightening device has better applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a side view of the pipe string straightening device of the pressure working machine of the utility model;

[0015] Figure 2 It is a top view of the pipe string straightening device of the pressure working machine of the utility model;

[0016] Figure 3 It is a cross-sectional view of the anti-bending mechanism of the pipe string straightening device of the pressure working machine of the utility model;

[0017] Figure 4It is a top view of the anti-bending mechanism of the pipe string straightening device of the pressure working machine of the utility model;

[0018] Figure 5 It is a cross-sectional view of the anti-bending sleeve of the anti-bending mechanism of the pipe string straightening device of the pressure working machine of the utility model;

[0019] Figure 6 It is a top view of the lower gland of the anti-bending mechanism of the pipe string straightening device of the pressure working machine of the utility model;

[0020] Figure 7 It is a top view of the support plate of the anti-bending mechanism of the pipe string straightening device of the pressure working machine of the utility model. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0022] See also Figure 1 The pipe string straightening device of the pressure-operating machine includes a supporting mechanism, a movable mechanism and an anti-bending mechanism.

[0023] The support mechanism includes an upper support plate 1, a lower support plate 3 and three support rods 5; wherein,

[0024] The upper support plate 1 and the lower support plate 3 are both plates with an axial through hole in the center, and the diameter of the axial through hole is larger than the outer diameter of the lowered pipe string; a connecting tube is formed by extending axially downward from the center of the bottom surface of the lower support plate 3, and a connecting flange matching the upper flange of the blowout preventer is provided on the outer wall of the bottom end of the connecting tube, so that the straightening device is connected and fixed to the top of the blowout preventer through the lower support plate 3;

[0025] The upper support plate 1 and the lower support plate 3 are arranged in parallel and spaced apart, and three support rod mounting holes and three cylinder mounting holes are evenly distributed in the circumferential direction of the outer circumference of the two, and the three support rod mounting holes and the three cylinder mounting holes are alternately arranged; three support rods 5 are vertically arranged between the upper support plate 1 and the lower support plate 3;

[0026] The top and bottom ends of each support rod 5 are respectively extended axially to form threaded connection ends, and the outer diameter of the threaded connection ends is smaller than the outer diameter of the support rod 5 and is adapted to the aperture of the connection hole, so that the threaded connection ends at the top ends of the three support rods 5 are respectively passed through the three connection holes on the upper support plate 1 and fixed to the upper support plate 1 by means of fixing nuts threadedly connected to the threaded connection ends, and the threaded connection ends at the bottom ends of the three support rods 5 are respectively passed through the three connection holes on the lower support plate 3 and fixed to the lower support plate 3 by means of fixing nuts threadedly connected to the threaded connection ends.

[0027] The movable mechanism includes three cylinders 2, which are vertically arranged between the upper support plate 1 and the lower support plate 3, and the top end of the cylinder barrel of each cylinder 2 is passed through and fixed in the three cylinder mounting holes of the upper support plate 1, and the bottom end is passed through the three cylinder mounting holes of the lower support plate 3, wherein the bottom end of the cylinder barrel of the cylinder 2 and the corresponding cylinder mounting hole can be selectively fixedly connected or not connected to each other; the top ends of the movable push rods of the three cylinders 2 are connected to the anti-bending mechanism, so as to push the anti-bending mechanism upward or downward in the axial direction of the support mechanism through the synchronous extension or synchronous retraction of the movable push rods of the three cylinders 2.

[0028] Since the pipe string straightening device of the hot working machine is installed on the top of the blowout preventer, and the top of the blowout preventer is originally provided with a slip for holding the pipe string, therefore, in this embodiment, see Figure 2 The upper support plate 1 and the lower support plate 3 are plates that protrude outward in the horizontal direction along the outer circumference and are formed with six mounting petals. The six mounting petals are used to install three cylinders 2 and three support rods 5 respectively, so that the space between the upper support plate 1 and the lower support plate 3 meets the installation space requirements of the aforementioned slips.

[0029] In this embodiment, the maximum stroke of the movable push rods on the three cylinders 2 is 1m, that is, the movable mechanism can push the anti-bending mechanism from the top surface of the upper support plate 1 to a height of 1m above the upper support plate 1; compared with the maximum rise of the lifting cylinder of 3m to 3.5m, the straightening device can reduce the unsupported length by 1m; in addition, in actual applications, the rod chamber and the rodless chamber of the three cylinders 2 are connected to the same air source, specifically the power source air source; specifically, when the movable push rods of the three cylinders 2 push the anti-bending mechanism to rise, the upper force of the rodless chamber is greater than the downward pressure of the rod chamber due to the piston area difference, so as to complete the rising action; and when the movable push rods of the three cylinders 2 descend, the descent is completed by relying on the downward pressure of the lifting cylinder, without manual operation.

[0030] The anti-bending mechanism includes a connecting plate 401, an anti-bending sleeve 402, a supporting plate 403 and a lower pressure cover 404; wherein,

[0031] The connecting disk 401 is a plate body with an axial through hole in the center and three connecting angles evenly distributed in the circumferential direction, so that the shape of the plate body is approximately triangular; the size of the connecting disk 401 is adapted to the size of the upper support plate 1, and a connection 4011 is provided at each of the three connecting angle tips of the connecting disk, so that the connecting holes 4011 on the three connecting angles can correspond to the three cylinder mounting holes on the upper support plate 1 one by one; the three movable push rod ends of the cylinder 2 are respectively inserted into the three connecting holes 4011 on the connecting disk 401 and fixed by screws; eight first screw holes 4012 are evenly distributed in the circumferential direction near the edge of the axial through hole of the connecting disk 401;

[0032] The anti-bending sleeve 402 is a cylindrical body, with a first outer annular boss 4021 on the top outer wall and an annular groove 4022 on the lower outer wall; as a preferred technical solution of this embodiment, the top inner wall of the anti-bending sleeve 402 is processed into an upper transition cone surface with an inner diameter gradually decreasing from top to bottom, and the bottom inner wall is processed into a lower transition cone surface with an inner diameter gradually increasing from top to bottom, so that when encountering an adjacent section pipe body coupling during the lowering of the pipe string, it is easy to lower it, thereby avoiding damage to the pipe body coupling due to collision with the anti-bending sleeve 402;

[0033] As a preferred technical solution of this embodiment, in this embodiment, three anti-bending sleeves 402 are provided, and the three anti-bending sleeves 402 have the same outer diameter but different inner diameters, specifically adapted to the outer diameters of the three specifications of the pipe string of 23 / 8, 27 / 8, and 31 / 2, respectively, so that the straightening device can be widely used in the straightening operation of the three specifications of the pipe string of 23 / 8, 27 / 8, and 31 / 2; during the operation, by replacing the anti-bending sleeve 402 matching the outer diameter of the pipe string to be lowered, the pipe string lowering operation can be continued;

[0034] The support plate 403 is a cylindrical body, and a second outer annular boss 4031 is provided on the outer wall of the top thereof, and four second screw holes 4032 are evenly distributed along the circumferential direction on the upper annular end face of the outer annular boss; the inner diameter of the support plate 403 is adapted to the outer diameter of the anti-bending sleeve 402, so that the support plate 403 can be sleeved on the outer side of the anti-bending sleeve 402 from bottom to top, and its top end is against the lower end face of the first outer annular boss 4021; the outer diameter of the support plate 403 is in line with the central axial direction of the connecting plate 401. The inner diameter of the through hole is adapted so that the connecting plate 401 can be sleeved on the outer side of the supporting plate 403 from bottom to top, and the top end thereof abuts against the lower end surface of the second outer annular boss 4021; the four second screw holes 4032 on the supporting plate 403 correspond to the four first screw holes 4011 arranged at intervals on the connecting plate 401, respectively, so that the connecting plate 401 and the supporting plate 403 are connected and fixed by the first bolts 406 respectively penetrating between each of the first screw holes 4011 and the second screw holes 4032;

[0035] The lower pressure cover 404 is a circular disk, and an inner ring boss is provided on the inner wall of the top thereof, and the radial width of the inner ring boss is adapted to the groove depth of the annular groove on the anti-bending sleeve 402; four third screw holes 4044 are evenly distributed along the circumferential direction on the lower pressure cover 404; in order to facilitate the replacement of the anti-bending sleeve 402, the lower pressure cover 404 is split into a first arc-shaped body 4041 and a second arc-shaped body 4042; in actual application, the first arc-shaped body 4041 and the second arc-shaped body 4042 are symmetrically arranged on both sides of the anti-bending sleeve 402, and are sleeved on the lower side of the anti-bending sleeve 402 in a matching manner, and the inner ring of the lower pressure cover 404 The shaped boss is embedded in the annular groove on the outer wall of the anti-bending sleeve 402; the multiple third screw holes 4044 on the lower pressure cover 404 correspond to the remaining several first screw holes 4011 arranged at intervals on the connecting plate 401, so that the lower pressure cover 404 and the supporting plate 403 are connected and fixed by the second bolts 405 respectively penetrating between each intersecting first screw hole 4011 and the third screw hole 4044; when the anti-bending sleeve 402 needs to be replaced, the lower pressure cover 404 can be removed, and the anti-bending sleeve 402 can be pulled down to remove it from the anti-bending mechanism for replacement, and then the lower pressure cover 404 can be reinstalled;

[0036] As a preferred technical solution of this embodiment, two through grooves 4043 penetrating the upper and lower end surfaces of the lower pressure cover 404 are symmetrically opened on the outer walls on both sides of the lower pressure cover 404 located on the split line of the lower pressure cover 404; the two through grooves 4043 serve as prying grooves, which are used to facilitate prying open the lower pressure cover 404 when replacing the anti-bending sleeve 402.

[0037] In the anti-bending mechanism, the connecting plate 401 is used to connect the anti-bending mechanism with the movable mechanism, the anti-bending sleeve 402 is matched with the lowered pipe column by size, and plays a role in straightening and anti-bending, while the support plate 403 and the lower pressure cover 404 are used to realize the connection between the anti-bending sleeve 402 and the connecting plate 401, so that the anti-bending sleeve 402 is easy to disassemble and replace; at the same time, the support plate 403 and the lower pressure cover 404 are structurally designed to match the anti-bending sleeve 402 in structure, which also increases the structural strength of the anti-bending mechanism and enhances the ability of the anti-bending mechanism to withstand large lateral loads during operation.

[0038] See also Figure 1 The specific application method of the pipe string straightening device of the pressure working machine is as follows:

[0039] The lower support plate 3 in the support mechanism is used to fix the device on the upper flange of the blowout preventer through bolt connection, and the support mechanism is used to replace the slip bracket of the slip device installed above the original blowout preventer, and two conical slips are installed between the upper support plate 1 and the lower support plate 3 of the support mechanism; the three cylinders of the movable mechanism are connected to the same power source gas source in the same way, so that the three cylinders 2 can maintain a state of being able to drive the movable push rod to extend upward under the action of the power source gas source; when the pressure-carrying operation machine is lowering the pipe under pressure, the lowered pipe string is passed through the central channel of the straightening device and is clamped by the conical slips.

[0040] In the initial state, the lifting cylinder located above the blowout preventer descends to the anti-bending mechanism. At the same time, the anti-bending mechanism is pressed down by the lifting cylinder, and the movable push rods of the three cylinders 2 are in a fully retracted state. In the pipe lowering condition, when the lifting cylinder begins to rise, its press-fitting effect on the anti-bending mechanism is released. The anti-bending mechanism rises synchronously with the lifting cylinder to the maximum stroke under the drive of the movable push rods of the three cylinders 2 extending upward, so that when the lifting cylinder rises to the specified high position, the unsupported length of the lowered pipe column is reduced under the action of the anti-bending mechanism. When the lifting cylinder descends, when it descends to the anti-bending mechanism, it will simultaneously press down to push the anti-bending mechanism downward synchronously. At the same time, the movable push rods of the three cylinders 2 are also pressed down to a fully retracted state. When the lifting cylinder rises again, the straightening device repeats the above process again to always protect the lowered pipe column from bending during the lowering process.

Claims

1. A pipe string straightening device for a pressure working machine, characterized in that: The invention comprises a supporting mechanism, a movable mechanism and an anti-bending mechanism; the supporting mechanism comprises an upper supporting plate (1) and a lower supporting plate (3) which are arranged in parallel and at intervals, an axial through hole with a diameter larger than the outer diameter of the lowered pipe column is opened at the center of the two plates, and a plurality of supporting rod mounting holes and cylinder mounting holes which are alternately arranged are evenly distributed in the circumferential direction of the outer circumference; a plurality of supporting rods (5) are vertically arranged between the upper supporting plate (1) and the lower supporting plate (3), and the two ends of each supporting rod (5) are passed through and fixed in a group of two corresponding supporting rod mounting holes on the upper supporting plate (1) and the lower supporting plate (3); the movable mechanism comprises a plurality of cylinders (2), which are arranged in a direction where the movable push rods are vertically upward. The anti-bending mechanism comprises a connecting plate (401) and an anti-bending sleeve (402); the connecting plate (401) is arranged parallel to the upper support plate (1) and fixed to the ends of the movable push rods of the multiple cylinders (2) so as to be lifted and lowered by the multiple cylinders (2); the inner diameter of the anti-bending sleeve (402) is adapted to the outer diameter of the lowered pipe column, and the anti-bending sleeve (402) is sleeved and detachably fixed in the center hole of the connecting plate (401).

2. The pipe string straightening device for a hot working machine according to claim 1, characterized in that: A connecting tube is formed at the center of the bottom surface of the lower support plate (3) and extends downward in the axial direction. A connecting flange matching with the upper flange of the blowout preventer is arranged on the outer wall of the bottom end of the connecting tube.

3. The pipe string straightening device for a hot working machine according to claim 1, characterized in that: The anti-bending mechanism also includes a support plate (403) and a lower pressure cover (404); wherein a first outer annular boss (4021) is provided on the outer wall at the top end of the anti-bending sleeve (402), and an annular groove (4022) is provided on the lower outer wall; the support plate (403) is sleeved between the connecting plate (401) and the anti-bending sleeve (402), and a second outer annular boss (4031) is provided on the outer wall at the top end thereof, so that the second outer annular boss (4031) is pressed onto the top surface of the connecting plate (401), and the first outer annular boss (4021) is pressed onto the top surface of the second outer annular boss (4031); the support plate (403) is provided by A plurality of bolts evenly distributed along the circumferential direction of the second outer annular boss (4031) are fixed to the connecting disk (401); the lower pressure cover (404) is composed of a first arc-shaped body (4041) and a second arc-shaped body (4042) which are split apart, and an inner annular boss is provided on the inner wall of the top end thereof; the lower pressure cover (404) is sleeved on the lower side of the anti-bending sleeve (402) in a manner that the two arc-shaped bodies are relatively engaged, and the inner annular boss of the lower pressure cover (404) is embedded in the annular groove on the outer wall of the anti-bending sleeve (402); the lower pressure cover (404) is fixed to the connecting disk (401) by a plurality of bolts evenly distributed along the circumferential direction.

4. The pipe string straightening device for a hot working machine according to claim 1, characterized in that: A plurality of anti-bending sleeves (402) are provided, and the plurality of anti-bending sleeves (402) have the same outer diameter and different inner diameters, and the inner diameters of the plurality of anti-bending sleeves (402) are respectively adapted to lowered pipe columns of different sizes and specifications.

5. The pipe string straightening device for a hot working machine according to claim 1 or 4, characterized in that: The inner wall of the top end of the anti-bending sleeve (402) is processed into an upper transition cone surface with an inner diameter gradually decreasing from top to bottom, and the inner wall of the bottom end is processed into a lower transition cone surface with an inner diameter gradually increasing from top to bottom.

6. The pipe string straightening device for a hot working machine according to claim 1 or 4, characterized in that: Two through grooves (4043) penetrating the upper and lower end surfaces of the lower pressure cover (404) are symmetrically provided on the outer walls on both sides of the lower pressure cover (404) located on the split line of the lower pressure cover (404).

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