A built-in hydraulic slip

Abstract

The invention discloses a built-in hydraulic slip, comprising a slip seat, a connector, a slip body and a connecting assembly. The slip body is arranged inside the slip seat, and a connector is arranged between the slip body and the slip seat. The connecting assembly is respectively connected to the connector and the inner wall of the slip seat. The invention solves the technical problem of small cava holding diameter in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of oil, natural gas and geological exploration equipment, and in particular to a built-in hydraulic slip. Background Art

[0002] The known oilfield operation mainly involves connecting multiple pipe strings into a long pipe string, and then decomposing the connected long pipe string into multiple pipe strings; installing downhole drilling tools and the like during the assembly and decomposition process to achieve the purpose of oil production; however, during the assembly and decomposition operations of the pipe strings, two elevators must be rotated back and forth, one as an elevator and the other as a seat, and the rotation of the roles of the two elevators requires operators to constantly lift at the wellhead, which is a strenuous job that requires strong young people, but the working environment at the wellhead is very harsh, and unpredictable events such as blowouts, falling objects from heights, and flying hydrogen sulfide gas may occur at any time, endangering personal safety, so relieving the physical labor of operators is the top priority of safety work; the existing hydraulic slip device has a small clamping diameter and high cost.

[0003] The patent with the authorization announcement number: CN 202832290 U discloses a hydraulic slip, including a cover plate, wherein the cover plate is connected with a tooth plate extending into an inverted cone-shaped base in the axial direction, and a hydraulic cylinder is arranged between the base and the cover plate, so that the falling process of the oil pipe is changed from passive falling by gravity to active falling by the action of the hydraulic cylinder, and the falling process is controllable, which can prevent radial deviation of the oil pipe during the falling process, the tooth plate is a three-petal structure in the radial direction and a three-section structure in the axial direction, and three sections of clips which are thickened successively from bottom to top are arranged on the outside of the tooth plate, so that the contact surface between the tooth plate and the oil pipe is relatively large, thereby reducing the indentation of the tooth plate on the oil pipe, the clip is a three-petal structure in the radial direction, and the outside of the clip is arranged with a guide plate of a three-petal structure in the radial direction, and the lower end of the guide plate is provided with a boss extending inwardly for carrying the clip and the tooth plate; however, the clamping diameter of the patent is small and cannot meet market demand. Summary of the invention

[0004] The purpose of the present invention is to provide a built-in hydraulic slip, which solves the technical problems of the hydraulic slip in the prior art, such as small clamping diameter, poor safety and lack of a centering device.

[0005] A built-in hydraulic slip comprises a slip seat, a connector, a slip body and a connecting assembly, wherein the slip body is arranged inside the slip seat, a connector is arranged between the slip body and the slip seat, and the connecting assembly is respectively connected to the connector and the inner wall of the slip seat.

[0006] On the basis of the above technical solution, the present invention can also be improved as follows:

[0007] Furthermore, the connecting assembly includes two hydraulic cylinders, a spline shaft and two connecting rod plates. The hydraulic cylinders are arranged at intervals, and the piston rack of the hydraulic cylinder is meshed with the spline shaft. A connecting rod plate is installed on the spline shaft. The ends of the two connecting rod plates are connected by a pin shaft, and the pin shaft passes through the connecting body. The beneficial effect of adopting this step is that the piston rack of the hydraulic cylinder is used in conjunction with the spline shaft, so that when the piston rack of the hydraulic cylinder moves, it can drive the spline shaft to rotate, thereby driving the connecting rod plate to rotate around the spline shaft, so that the connecting body can move up and down.

[0008] Furthermore, the hydraulic cylinder is a rack cylinder. The beneficial effect of adopting this step is that the rack cylinder can complete the counterclockwise and clockwise rotation of the spline shaft.

[0009] Furthermore, a connecting key is provided between the inner side of the connector and the outer side of the slip body, and the connecting key is installed on the inner side of the connector by means of screws. The beneficial effect of adopting this step is that the slip body is installed by means of the connecting key, thereby ensuring the structural stability of the slip body.

[0010] Furthermore, the taper difference of the connector is not less than 80 mm. The beneficial effect of this step is that the clamping diameter of the slip body can be enlarged.

[0011] Furthermore, a cover plate is installed on the cava seat, a scraper disc is installed above the cover plate, and a centering device is installed at the bottom of the cover plate. The beneficial effect of adopting this step is that the scraper disc is installed in the annular floating groove formed on the cover plate. When drilling, the scraper disc holds the drill rod and floats in the annular floating groove with the swing of the drill rod to perform the mud scraping operation of the drill rod.

[0012] Furthermore, the cover plate is composed of two semicircular cover plates, and a centering device is installed at the bottom of each semicircular cover plate. The centering device includes a centering swing body and a pushing hydraulic cylinder. The centering swing body is semi-annular, and one end of the centering swing body is installed at the bottom of the semicircular cover plate through a pin shaft, and the other end is connected to the output end of the pushing hydraulic cylinder. The pushing hydraulic cylinder is installed at the bottom of the semicircular cover plate. The beneficial effect of adopting this step is that centering is performed through the centering device, and it can be used normally even when the wellhead is not straight.

[0013] Furthermore, a gas scraper ring is installed at the bottom of the slip body. The beneficial effect of adopting this step is to perform jet scraping through the gas scraper ring.

[0014] Furthermore, it also includes a power cava clamp head replacement device, which is installed above the connector. The beneficial effect of this step is that the "locking by dropping the hand and releasing by pulling out" design is adopted to shorten the replacement time of the cava body.

[0015] Furthermore, the clamping range of the slip body is 2-7 / 8"---13-3 / 8"mm.

[0016] Beneficial effects of the present invention:

[0017] 1. The present invention provides a built-in hydraulic slip, in which the connecting body adopts a unique large conical surface difference design, the slip body has a small upward and downward moving distance, and a large change in the diameter direction. After being installed on the turntable, whether in working state or non-working state, the upper plane of the built-in hydraulic slip is flush with the drilling platform, and does not affect the use of other tools on the drilling platform.

[0018] 2. The present invention provides a connecting assembly inside the slip seat, through which the slip body and the connecting body can complete the upward and downward movement.

[0019] 3. The present invention is a built-in hydraulic slip, which is installed in the drilling platform and has high safety performance.

[0020] 4. The present invention is provided with a centering device, through which the centering is performed, and the wellhead can be used normally even when the wellhead is not straight;

[0021] 5. The present invention has a large clamping range, the slip body can be quickly replaced, and pipes of different diameters can be clamped at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of a built-in hydraulic slip according to a specific embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a connection assembly and a slip seat of a built-in hydraulic slip according to a specific embodiment of the present invention;

[0025] Figure 3 A cross-sectional view of a connection assembly and a slip seat of a built-in hydraulic slip according to a specific embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of a hydraulic cylinder and a spline shaft of a built-in hydraulic slip according to a specific embodiment of the present invention;

[0027] Figure 5 A top view of a built-in hydraulic slip according to a specific embodiment of the present invention;

[0028] Figure 6A bottom view of a centering device for a built-in hydraulic slip according to a specific embodiment of the present invention;

[0029] Figure 7 It is a structural schematic diagram of a centering device of a built-in hydraulic slip according to a specific embodiment of the present invention;

[0030] Figure 8 It is a structural schematic diagram of a power slip clamp head connection device for replacing a built-in hydraulic slip according to a specific embodiment of the present invention;

[0031] Fig. 9 It is an isometric view of the connection of a power slip clamp head device for replacing a built-in hydraulic slip according to a specific embodiment of the present invention;

[0032] Fig.10 It is a structural schematic diagram of a connector of a built-in hydraulic slip according to a specific embodiment of the present invention;

[0033] Fig.11 It is an enlarged schematic diagram of a top pin portion of a built-in hydraulic slip according to a specific embodiment of the present invention;

[0034] Fig.12 A top view of a gas scraper ring of a built-in hydraulic slip according to a specific embodiment of the present invention;

[0035] Reference numerals:

[0036] 1-slip seat; 2-connector; 3-slip body; 4-connection assembly; 5-hydraulic cylinder; 6-spline shaft; 7-connecting rod; 8-piston rack; 9-pin shaft; 10-connecting key; 11-cover plate; 12-scraper plate; 13-screw; 14-centering device; 15-gas scraper ring; 16-power slip clamp head replacement device;

[0037] 1401-centering swing body; 1402-push hydraulic cylinder; 1403-pin shaft; 1404-limiting groove; 1405-limiting block;

[0038] 1601-unlocking member; 1602-locking member; 1603-installing groove; 1604-unlocking lifting ring; 1605-fixing block; 1606-lifting section; 1607-unlocking section; 1608-lifting hole; 1609-through groove; 1610-protrusion; 1611-locking seat; 1612-pressure plate; 1613-thrust pin; 1614-rotating shaft; 1615-pressure plate; 1616-pin hole; 1617-spring. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0040] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0041] In the description of the present application, it should be understood that the terms "center", "up", "down", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Example

[0044] like Figure 1 As shown, a built-in hydraulic cava provided by the present invention includes a cava seat 1, a connecting body 2, a cava body 3 and a connecting component 4, wherein the cava body 3 is arranged inside the cava seat 1, and a connecting body 2 is arranged between the cava body 3 and the cava seat 1, and the connecting component 4 is respectively connected to the connecting body 2 and the inner wall of the cava seat 1; the cava body 3 is cooperatively connected with the connecting body 2, and the connecting component 4 can drive the connecting body 2 to move up and down relative to the cava seat 1, that is, it can drive the cava body 3 to move.

[0045] like Figure 1-4As shown, the connecting assembly 4 includes two hydraulic cylinders 5, two spline shafts 6 and two connecting rods 7. The hydraulic cylinders 5 are arranged at intervals, and the piston rack 8 of the hydraulic cylinder 5 is meshed with the spline shaft 6. The connecting rod 7 is installed on the spline shaft 6. The ends of the two connecting rods 7 are connected by a pin 9. The pin 9 passes through the connecting body 2. The hydraulic cylinder 5 is a rack oil cylinder. The movement of the piston rack 8 of the hydraulic cylinder 5 drives the spline shaft 6 to rotate counterclockwise or clockwise, and the connecting rod 7 moves along with it. One end of the connecting rod 7 is installed on the spline shaft 6, and the other end is connected by a pin 9. The pin is located inside the connecting body 2, so that the connecting body 2 can be driven to move; the hydraulic cylinder 5 of the present invention moves up and down, and the connecting body 2 moves up and down through the connecting rod 7, thereby driving the slip body 3 to move up and down. When the slip body moves downward, it pushes the drill rod to gather toward the center and clamps the drill rod. On the contrary, the drill rod is released and the passage is made free to ensure that the drill rod passes freely from the center of the slip.

[0046] like Figure 1 As shown, a connecting key 10 is provided between the inner side of the connector 2 and the outer side of the cava body 3, and the connector 2 and the connecting key 10 are fixed by screws 13, thereby ensuring the stability of the connecting key. Meanwhile, the outer side of the connecting key 10 cooperates with the cava body 3, thereby ensuring that the cava body 3 can move with the connector 2.

[0047] like Figure 1 As shown, the taper difference of the connector 2 is not less than 80 mm. The taper difference of the connector 2 of the present invention can reach 80 mm, so that the up and down moving distance of the cava body 3 is small. After being installed on the turntable, whether in the working state or the non-working state, the upper plane of the built-in hydraulic cava is flush with the drilling platform, and does not affect the use of other tools on the drilling platform.

[0048] like Figure 5 As shown, a cover plate 11 is installed above the cava seat 1, and a scraper plate 12 is installed above the cover plate 11. The scraper plate 12 is installed in an annular floating groove formed on the cover plate. The scraper plate 12 in the present invention is located in the middle of the cover plate. When drilling, the scraper plate holds the drill rod and floats in the annular floating groove with the swing of the drill rod to perform the scraping operation of the drill rod.

[0049] like Figure 6-7As shown, the present invention is provided with a centering device 14 under the cover plate, and the centering is performed by the centering device 14; the cover plate in the present invention is composed of two semicircular cover plates, the semicircular cover plates are hinged on the slip seat, and are turned outward, and a centering device 14 is installed at the bottom of each semicircular cover plate, wherein the centering device 14 includes a centering swing body 1401 and a pushing hydraulic cylinder 1402, the centering swing body 1401 is located at the bottom of the semicircular cover plate, the centering swing body 1401 is semi-ring-shaped, one end of the centering swing body 1401 is installed at the bottom of the semicircular cover plate through a pin shaft 1403, and the other end is connected to the output of the pushing hydraulic cylinder 1402 The output end is connected, and the pushing hydraulic cylinder 1402 is installed at the bottom of the semicircular cover plate; the centering swing bodies of the two centering devices 14 in the present invention can be combined to form a ring to clamp the scraper plate 12; the pushing hydraulic cylinder 1402 can push the centering swing body 1401 to rotate around the pin shaft 1403, and a plurality of limit grooves 1404 are also arranged under the cover plate 11, and a limit block 1405 is also arranged on the outer edge of the centering swing body 1401, and the limit block 1405 is arranged inside the limit groove 1404, so that the movement direction of the centering swing body 1401 can be limited, thereby ensuring that the workpiece moves horizontally during operation.

[0050] like Figure 1 As shown, the clamping range of the slip body 3 is 2-7 / 8"---13-3 / 8" mm.

[0051] like Figure 1 , 12 As shown, a gas scraper ring 15 is installed at the bottom of the slip body 3, and jet scraping is performed through the gas scraper ring. The gas scraper ring 15 is existing and will not be described in detail here.

[0052] Among them, Figure 8-11As shown, it also includes a power slip clamp head replacement device 16, which is installed above the connecting body 2 to achieve rapid replacement of the slip body, and adopts a "locking by dropping the hand, releasing by pulling out" design to shorten the replacement time of the slip body. The power slip clamp head replacement device 16 is consistent with the mechanism described in the patent document of application number 2017113490407, which is convenient for rapid replacement of slips. The power slip clamp head replacement device 16 includes an unlocking member 1601 and a locking member 1602, and an installation groove 1603 is opened on the outer side of the slip body, and the unlocking member 1601 is arranged inside the installation groove 1603, wherein the unlocking member 1601 includes a fixed block 1605 and an unlocking lifting ring 1604, wherein the unlocking lifting ring 1604 is located inside the installation groove 1603, and the unlocking lifting ring 1604 includes a hoisting section 1606 and an unlocking section 1607, wherein the hoisting section 1606 is located above the unlocking section 1607, and a hoisting hole 1608 is provided above the hoisting section 1606, and a through slot 1609 is provided inside the unlocking section 1607, wherein both ends of the fixed block 1605 are fixed inside the installation groove 1609, and the middle part of the fixed block 1605 is located inside the through slot 1609, and the width of the fixed block 1605 is greater than the width of the upper part of the installation groove 1603;

[0053] The mounting groove 1605 is stepped, and the width of the upper portion of the mounting groove 1605 is greater than the width of the lower portion of the mounting groove 1605;

[0054] A protrusion 1610 is provided on the outer wall of the unlocking section 1607 of the unlocking lifting ring 1604, and the outer end surface of the protrusion 1610 is a horizontal surface;

[0055] Among them, the locking structure 1602 includes a locking seat 1611, a pressure plate 1612 and a plurality of push pins 1613. The locking seats 1611 are arranged at intervals, and a rotating shaft 1614 is arranged inside the locking seat 1611. The pressure plate 1615 is connected between the rotating shafts 1614. Pin holes 1616 are arranged at intervals on the connecting body 2. One end of the push pin 1613 is arranged inside the pin hole 1616, and the other end contacts the bottom of the pressure plate 1612. The inner side of the pressure plate 1612 contacts the protrusion 1610. A spring 1617 is mounted on the push pin 1613.

[0056] When replacing the pliers head, lift the unlocking lifting ring 1604, the unlocking lifting ring 1604 slides inside the installation groove 1603, the protrusion 1610 of the unlocking section 1607 will push the pressure plate 1612, and the pressure plate 1615 will rotate under the action of the rotation 1614, and finally be tangent to the protrusion 1610. When the unlocking lifting ring 1604 moves to a certain height, the fixed block 1605 reaches the bottom of the through groove 1609, and the unlocking lifting ring 1604 can pull the pliers head to move upward together. At this time, the pressure plate 1615 will not press the protrusion 1610, so that the pliers head can be hoisted out; during installation, also, first hoist the unlocking lifting ring 1604, then put the pliers head in, and finally the pressure plate 1612 rotates to press the protrusion 1610, thereby completing the locking of the pliers head.

[0057] In the description of the present invention, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A built-in hydraulic slip, characterized in that: It includes a slip seat, a connector, a slip body and a connecting assembly, wherein the slip body is arranged inside the slip seat, and a connector is arranged between the slip body and the slip seat, and the connecting assembly is respectively connected to the connector and the inner wall of the slip seat; the taper difference of the connector is not less than 80 mm; The connecting assembly comprises two hydraulic cylinders, a spline shaft and two connecting rods, the hydraulic cylinders are arranged at intervals, and the piston racks of the hydraulic cylinders are meshed with the spline shaft, the connecting rod is installed on the spline shaft, and the ends of the two connecting rods are connected by a pin shaft, and the pin shaft passes through the connecting body; A cover plate is installed on the slip seat, a scraper plate is installed above the cover plate, and a centering device is installed at the bottom of the cover plate; the scraper plate is installed in an annular floating groove formed on the cover plate, and when drilling, the scraper plate holds the drill rod and floats in the annular floating groove with the swing of the drill rod to perform a scraping operation on the drill rod; The cover plate is composed of two semicircular cover plates, each of which is provided with a centering device at the bottom, the centering device comprising a centering swing body and a push hydraulic cylinder, the centering swing body is semi-circular, one end of the centering swing body is installed at the bottom of the semicircular cover plate through a pin, and the other end is connected to the output end of the push hydraulic cylinder, and the push hydraulic cylinder is installed at the bottom of the semicircular cover plate; A plurality of limiting grooves are also arranged below the cover plate, and a limiting block is also arranged on the outer edge of the centering swing body. The limiting block is arranged inside the limiting groove, so that the movement direction of the centering swing body can be limited.

2. The built-in hydraulic slip according to claim 1, characterized in that: The hydraulic cylinder is a rack cylinder.

3. The built-in hydraulic slip according to claim 1, characterized in that: A connecting key is arranged between the inner side of the connecting body and the outer side of the slip body, and the connecting key is installed on the inner side of the connecting body by means of screws.

4. The built-in hydraulic slip according to claim 1, characterized in that: The utility model also comprises a gas scraper ring, which is installed at the bottom of the slip seat.

5. The built-in hydraulic slip according to claim 1, characterized in that: The utility model also comprises a device for replacing a power slip clamp head, wherein the device for replacing a power slip clamp head is installed above the connecting body.

6. The built-in hydraulic slip according to claim 1, characterized in that: The clamping range of the slip body is 2-7 / 8"---13-3 / 8"mm.

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