High-load pneumatic slip

Abstract

The high-load pneumatic slip comprises a slip supporting inner core body and slips, a plurality of slips distributed in an annular array are arranged in the slip supporting inner core body, first oil chambers used for being filled with hydraulic oil are arranged on the upper portions of the back conical surfaces of the slips, and second oil chambers used for being filled with hydraulic oil are arranged on the lower portions of the back conical surfaces of the slips. After a clamping pipe fitting is clamped, under the work of a liquid pump, hydraulic oil in the second oil chamber is guided into the first oil chamber, so that the first oil chamber is filled with the hydraulic oil, the loosening resistance of the slips is increased, and the clamping load and the clamping stability of the clamping device are further improved; the oil pressure in the first oil chamber is detected through the oil pressure detector, when the oil pressure detector detects that the oil pressure is reduced, it is judged that the oil leakage risk exists, and workers can conveniently assist in repairing and maintaining.

Description

Technical Field

[0001] The invention relates to the technical field of equipment used in a petroleum casing operation process, and in particular to a high-load pneumatic slip. Background Art

[0002] Pneumatic slips are pneumatically operated tools for lifting and lowering drill pipes, clamping casings, oil pipes and other pipes in oil and gas drilling operations. The opening and closing of the slips are achieved through a pneumatic system. Installed in the large slip hole of the drill plate, the slip body is driven by the cylinder piston rod and the guide rod to move along the tapered surface of the slip seat, thereby clamping or loosening the drill pipe. For example, application number CN201320426663.0 discloses a new type of pneumatic slip-type casing elevator, including an elevator body, which is composed of two parts connected by a hinge pin, and a slip is installed in the central conical hole of the elevator body. The slip body is connected to four cylinders through their respective connecting mechanisms. After the slip clamps the drill pipe, the casing, oil pipe and other pipes, it is connected and fixed by four cylinders. However, when the cylinder air pressure of the device is insufficient, it is easy to cause a decrease in the clamping force, resulting in a decrease in the upper limit of the clamping load of the slip. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a high-load pneumatic slip to more accurately solve the above problems.

[0004] The present invention is achieved through the following technical solutions: The present invention proposes a high-load pneumatic cava, comprising a cava supporting inner core and a cava, wherein a plurality of cava arranged in a ring array are arranged inside the cava supporting inner core, a landslide step groove is arranged on the inner cavity wall of the cava supporting inner core, a landslide step matching the landslide step groove is arranged on the back cone surface of the cava, a cava traction bracket is arranged on the top of the cava supporting inner core, a hinged ear seat is arranged at the top of each cava, and the hinged ear seat arranged at the top of the cava is hinged to the cava traction bracket through a connecting arm, a plurality of cylinder piston rods arranged in a ring array are connected to the outer periphery of the cava traction bracket, the telescopic rod of the cylinder piston rod extends vertically upward, and the upper end of the telescopic rod of the cylinder piston rod is connected to the cava traction bracket, a cava rack is arranged on the inner end wall of the cava, a first oil chamber for filling hydraulic oil is arranged on the upper part of the back cone surface of the cava, and a second oil chamber for filling hydraulic oil is arranged on the lower part of the back cone surface of the cava.

[0005] Furthermore, a vertically opened cava rack assembly groove is opened on the inner end wall of the cava, the groove cross-section of the cava rack assembly groove is a trapezoidal cross-section, and the cava rack is slidably engaged in the cava rack assembly groove, and a bolt for limiting the cava rack is connected to the top of the cava rack assembly groove.

[0006] Furthermore, the inner end clamping surface of the slip rack is an arc surface matching the diameter of the clamped pipe fitting, and the clamping surface of the slip rack is a toothed surface.

[0007] Furthermore, a first oil passage connected to the first oil chamber is opened inside the cava support inner core, a second oil passage connected to the second oil chamber is opened inside the cava support inner core, a third oil passage connected to the second oil passage is opened at the bottom of the cava support inner core, the bottom end of the third oil passage is connected to one of the interfaces of the liquid pump, the other interface of the liquid pump is connected to the first oil passage, and a hydraulic oil circuit breaker assembly is provided in the middle of the third oil passage in the cava support inner core.

[0008] Sealing strip annular grooves are provided on the back cone surface of the slip and on the outer peripheries of the first oil chamber and the second oil chamber, and wear-resistant sealing strips are provided in the sealing strip annular grooves. Side sealing plates are integrally formed on both sides of the landslide step groove in the inner cavity of the slip support core, and the wear-resistant sealing strips provided on the outer peripheries of the first oil chamber and the second oil chamber are tightly fitted with the surfaces of the landslide step groove and the side sealing plates.

[0009] Furthermore, the two side surfaces of the slip are parallel planes, and the side sealing plates arranged on both sides of the landslide step groove are in contact with the two side surfaces of the slip.

[0010] Furthermore, the outer wall of the slip support inner core is provided with a hydraulic detection channel connected to the first oil chamber, and an outer port of the hydraulic detection channel is connected to an oil pressure detector.

[0011] Furthermore, the oil pressure detector (107) is signal-connected to a processor, and the processor is connected to a low-pressure alarm module.

[0012] Furthermore, the hydraulic oil circuit breaker assembly includes a sliding pin groove inside the inner core of the slip support vertically connected to the third oil channel, a circuit breaker pin is slidably connected in the sliding pin groove, an oil hole is opened in the middle of the circuit breaker pin, and a pressure spring is connected between the outer end of the circuit breaker pin and the inner cavity side wall of the sliding pin groove.

[0013] Furthermore, the outer end of the disconnecting slide pin is connected with an armature, the slip supports the outer wall of the inner core body and an electromagnet is provided at a position corresponding to the disconnecting slide pin, and the magnetized end of the electromagnet corresponds to the position of the armature.

[0014] Beneficial effects of the present invention: 1. The present invention lifts and pulls the slip traction bracket through the cylinder piston rod, and the slip traction bracket lifts and pulls a plurality of slips through the connecting arm, and the slips are guided by the cooperation of the landslide step and the landslide step groove, so that the plurality of slips tightly clamp the clamped pipe fittings, and the slips are not easy to loosen and disengage under the action of the plurality of cylinder piston rods; a replaceable and stably assembled slip rack is provided, so as to facilitate the replacement and adjustment of the diameter of the clamped pipe fittings; 2. After the clamped pipe fitting is clamped, the hydraulic oil in the second oil chamber is introduced into the first oil chamber under the operation of the liquid pump, so that the first oil chamber is filled with hydraulic oil, thereby increasing the resistance to the loosening of the slips, and further improving the clamping load and clamping stability of the present invention; the oil pressure in the first oil chamber is detected by the oil pressure detector, and when the oil pressure detector detects a drop in the oil pressure, it is determined that there is a risk of oil leakage, which is convenient for the staff to assist in repair and maintenance; 3. In the present invention, when the oil pressure in the first oil chamber and the second oil chamber is converted, the magnetized end is magnetized under the operation of the electromagnet, thereby attracting the armature at the end of the disconnecting sliding pin, so that the oil hole in the middle of the disconnecting sliding pin is connected to the third oil channel, thereby realizing the oil circuit connection, and in the clamping state, the electromagnet stops working, and the disconnecting sliding pin rebounds under the action of the pressure spring, so that the oil hole of the disconnecting sliding pin is misaligned with the third oil channel to achieve disconnection, thereby isolating the oil exchange between the first oil chamber and the second oil chamber, so that the clamping force can be stably maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front cross-sectional view of the structure of the present invention in a non-clamping state; Figure 3 It is a front cross-sectional view of the structure of the present invention in a clamping state; Figure 4 for Figure 3 The enlarged view of point A in the middle; Figure 5 It is a schematic diagram of the three-dimensional structure of the inner core body supported by the slips in the present invention; Figure 6 This is a schematic diagram of the first three-dimensional structure of the slip in the present invention; Figure 7 It is a second three-dimensional structural schematic diagram of the slip in the present invention.

[0016] In the figure: 1. Slip support inner core; 101. Slope step groove; 102. Side sealing plate; 103. First oil channel; 104. Second oil channel; 105. Third oil channel; 106. Liquid pump; 107. Oil pressure detector; 2. Slip; 201. Slope step; 202. Articulated ear seat; 203. First oil chamber; 204. Second oil chamber; 205. Wear-resistant sealing strip; 206. Slip rack; 2061. Slip rack assembly groove; 3. Slip traction bracket; 301. Connecting arm; 4. Cylinder piston rod; 5. Hydraulic oil circuit breaker assembly; 501. Slide pin groove; 502. Circuit breaker slide pin; 503. Oil hole; 504. Armature; 505. Pressure spring; 506. Electromagnet; 507. Magnetization end. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0018] A high-load pneumatic slip comprises a slip supporting inner core 1 and slips 2. The interior of the slip supporting inner core 1 is provided with a plurality of slips 2 arranged in a ring array. A landslide step groove 101 is provided on the inner cavity wall of the slip supporting inner core 1. A landslide step 201 matching the landslide step groove 101 is provided on the back cone surface of the slip 2. A slip traction bracket 3 is provided on the top of the slip supporting inner core 1. A hinged ear seat 202 is provided at the top of each slip 2, and the hinged ear seat 202 provided at the top of the slip 2 is hinged to the slip traction bracket 3 through a connecting arm 301. The outer periphery of the slip traction bracket 3 is connected with a plurality of cylinder piston rods 4 arranged in a ring array. The telescopic rod of the cylinder piston rod 4 extends vertically upward, and the upper end of the telescopic rod of the cylinder piston rod 4 is connected to the slip traction bracket 3. The cylinder piston rod 4 is fixed on the outer shell of the slip city elevator. The outer shell is the common knowledge of the basic parts of the slip city elevator. The drawings of the present invention are not drawn. Figure 2 and Figure 3 As shown, the slip traction bracket 3 is lifted and pulled by the cylinder piston rod 4, and the slip traction bracket 3 lifts and pulls a plurality of slips 2 through the connecting arm 301, and the slips 2 are guided by the cooperation of the landslide step 201 and the landslide step groove 101, so that the plurality of slips 2 can tightly clamp the clamped pipe fittings.

[0019] A slip rack 206 is provided on the inner end wall of the slip 2. The inner end clamping surface of the slip rack 206 is an arc surface that matches the diameter of the clamped pipe. The clamping surface of the slip rack 206 is a toothed surface to improve the gripping force between the slip rack 206 and the surface of the clamping piece. Figure 6 As shown, a vertically opened cava rack assembly groove 2061 is opened on the inner end wall of the cava 2, the groove section of the cava rack assembly groove 2061 is a trapezoidal section, and the cava rack 206 is slidably engaged in the cava rack assembly groove 2061, and a bolt for limiting the cava rack 206 is connected to the top of the cava rack assembly groove 2061. A replaceable and stably assembled cava rack 206 is provided, which is convenient for replacing and adjusting the diameter of the clamped pipe fittings.

[0020] The technical scheme in the above-mentioned embodiment of the present application has at least the following technical effects or advantages: the present invention lifts and pulls the slip traction bracket 3 through the cylinder piston rod 4, and the slip traction bracket 3 lifts and pulls a plurality of slips 2 through the connecting arm 301, and the slips 2 are guided by the cooperation of the landslide step 201 and the landslide step groove 101, so that the plurality of slips 2 tightly clamp the clamped pipe fittings, and under the action of the plurality of cylinder piston rods 4, the slips 2 are not easy to loosen and detach; a replaceable and stably assembled slip rack 206 is provided to facilitate the replacement and adjustment of the diameter of the clamped pipe fittings. Example 2

[0021] A first oil chamber 203 for filling hydraulic oil is provided at the upper part of the back cone surface of the slip 2, a second oil chamber 204 for filling hydraulic oil is provided at the lower part of the back cone surface of the slip 2, a first oil passage 103 connected to the first oil chamber 203 is provided inside the slip support inner core 1, a second oil passage 104 connected to the second oil chamber 204 is provided inside the slip support inner core 1, a third oil passage 105 connected to the second oil passage 104 is provided at the bottom of the slip support inner core 1, the bottom end of the third oil passage 105 is connected to one of the interfaces of the liquid pump 106, and the other interface of the liquid pump 106 is connected to the first oil passage 103, as shown in FIG. Figure 3 As shown, after the present invention clamps the clamped pipe, the hydraulic oil in the second oil chamber 204 is introduced into the first oil chamber 203 under the operation of the liquid pump 106, so that the first oil chamber 203 is filled with hydraulic oil, thereby increasing the resistance of the slip 2 to loosening, and further improving the clamping load and clamping stability of the present invention. Figure 3 As shown, in the process of loosening the clamping, the hydraulic pump 106 works in reverse to introduce the hydraulic oil in the first oil chamber 203 into the second oil chamber 204, so that the slips 2 can be moved to loosen the clamping.

[0022] It is worth mentioning that Figure 2 , Figure 5 and Figure 6As shown, sealing strip ring grooves are provided on the back cone surface of the cava 2 and located on the outer periphery of the first oil chamber 203 and the second oil chamber 204, and the sealing strip ring grooves are matched with wear-resistant sealing strips 205, and side sealing plates 102 are integrally formed on both sides of the landslide step groove 101 in the inner cavity of the cava supporting inner core 1, and the wear-resistant sealing strips 205 provided on the outer periphery of the first oil chamber 203 and the second oil chamber 204 are tightly fitted with the surfaces of the landslide step groove 101 and the side sealing plates 102, the two side surfaces of the cava 2 are parallel planes, and the side sealing plates 102 provided on both sides of the landslide step groove 101 are fitted with the two side surfaces of the cava 2, thereby improving the sealing of the hydraulic oil separated between the first oil chamber 203 and the second oil chamber 204.

[0023] The outer wall of the cava support inner core 1 is provided with a hydraulic detection channel connected to the first oil chamber 203, and the outer port of the hydraulic detection channel is connected to the oil pressure detector 107, which detects the internal oil pressure of the first oil chamber 203. When the oil pressure detector 107 detects a drop in oil pressure, it is determined that there is a risk of oil leakage, which is convenient for staff to assist in repair and maintenance; the oil pressure detector 107 signal is connected to a processor, and the processor is connected to a low-pressure alarm module. The processor collects and processes the internal oil pressure data of the first oil chamber 203. When the oil pressure detector 107 detects a drop in oil pressure, it is fed back to the low-pressure alarm module to issue a voice or light alarm prompt.

[0024] The technical solution in the above-mentioned embodiment of the present application has at least the following technical effects or advantages: after the present invention clamps the clamped pipe, under the operation of the liquid pump 106, the hydraulic oil inside the second oil chamber 204 is introduced into the first oil chamber 203, so that the first oil chamber 203 is filled with hydraulic oil, thereby increasing the resistance to loosening of the cava 2, and further improving the clamping load and clamping stability of the present invention; the oil pressure inside the first oil chamber 203 is detected by the oil pressure detector 107. When the oil pressure detector 107 detects a drop in oil pressure, it is judged that there is a risk of oil leakage, which is convenient for staff to assist in repair and maintenance. Example 3

[0025] Combination Figure 1 , Figure 3 and Figure 4As shown, a hydraulic oil circuit breaker assembly 5 is provided in the middle of the third oil passage 105 provided in the cava support inner core 1. The hydraulic oil circuit breaker assembly 5 includes a sliding pin groove 501 which is vertically connected to the third oil passage 105 inside the cava support inner core 1. A circuit breaker pin 502 is slidably connected in the sliding pin groove 501. An oil hole 503 is provided in the middle of the circuit breaker pin 502. A pressure spring 505 is connected between the outer end of the circuit breaker pin 502 and the inner cavity side wall of the sliding pin groove 501. An armature 504 is connected to the outer end of the circuit breaker pin 502. An electromagnet 506 is provided on the outer wall of the cava support inner core 1 and at the position corresponding to the circuit breaker pin 502. The magnetized end 507 of the electromagnet 506 corresponds to the position of the armature 504. When the oil pressure of the first oil chamber 203 and the second oil chamber 204 is converted, the magnetizing end 507 is magnetized under the operation of the electromagnet 506, thereby attracting the armature 504 at the end of the disconnecting sliding pin 502, so that the oil hole 503 in the middle of the disconnecting sliding pin 502 is connected to the third oil channel 105, thereby realizing the oil circuit connection, and in the clamping state, the electromagnet 506 stops working, and the disconnecting sliding pin 502 rebounds under the action of the pressure spring 505, so that the oil hole 503 of the disconnecting sliding pin 502 is misaligned with the third oil channel 105 to achieve disconnection, thereby isolating the oil exchange between the first oil chamber 203 and the second oil chamber 204, so that the clamping force can be stably maintained.

[0026] The technical solution in the above-mentioned embodiment of the present application has at least the following technical effects or advantages: when the first oil chamber 203 and the second oil chamber 204 perform oil pressure conversion, the magnetizing end 507 is magnetized under the operation of the electromagnet 506, thereby attracting the armature 504 at the end of the disconnecting slide pin 502, so that the oil hole 503 in the middle of the disconnecting slide pin 502 is connected to the third oil channel 105, thereby realizing oil circuit connection, and in the clamping state, the electromagnet 506 stops working, and the disconnecting slide pin 502 rebounds under the action of the pressure spring 505, so that the oil hole 503 of the disconnecting slide pin 502 is misaligned with the third oil channel 105 to achieve disconnection, thereby isolating the oil exchange between the first oil chamber 203 and the second oil chamber 204, so that the clamping force can be stably maintained.

[0027] Of course, the present invention may have many other implementations. Based on this implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present invention.

Claims

1. A high-load pneumatic slip, comprising a slip support inner core (1) and a slip (2), characterized in that: A plurality of slips (2) arranged in a ring array are arranged inside the slip support inner core (1); a landslide step groove (101) is arranged on the inner cavity wall of the slip support inner core (1); a landslide step (201) matching the landslide step groove (101) is arranged on the back cone surface of the slip (2); a slip traction bracket (3) is arranged on the top of the slip support inner core (1); a hinged ear seat (202) is arranged on the top of each slip (2); and the hinged ear seat (202) arranged on the top of the slip (2) is hingedly connected to the slip traction bracket (3) through a connecting arm (301); and a plurality of cylinder pistons arranged in a ring array are connected to the outer periphery of the slip traction bracket (3). Rod (4), the telescopic rod of the cylinder piston rod (4) extends vertically upward, and the upper end of the telescopic rod of the cylinder piston rod (4) is connected to the cava traction bracket (3), a cava rack (206) is provided on the inner end wall of the cava (2), a first oil chamber (203) for filling hydraulic oil is provided on the upper part of the back cone surface of the cava (2), and a second oil chamber (204) for filling hydraulic oil is provided on the lower part of the back cone surface of the cava (2), a first oil passage (103) connected to the first oil chamber (203) is opened inside the cava support inner core (1), and a second oil passage (104) connected to the second oil chamber (204) is opened inside the cava support inner core (1).

2. A high load pneumatic slip according to claim 1, characterized in that: A vertically opened cava rack assembly groove (2061) is opened on the inner end wall of the cava (2); the grooved cross section of the cava rack assembly groove (2061) is a trapezoidal cross section, and the cava rack (206) is slidably engaged in the cava rack assembly groove (2061); a bolt for limiting the cava rack (206) is connected to the top end of the cava rack assembly groove (2061).

3. A high load pneumatic slip according to claim 2, characterized in that: The inner end clamping surface of the slip rack (206) is an arc surface matching the diameter of the clamped pipe fitting, and the clamping surface of the slip rack (206) is a toothed surface.

4. A high load pneumatic slip according to claim 1, characterized in that: A third oil passage (105) connected to the second oil passage (104) is provided at the bottom of the slip support inner core (1), the bottom end of the third oil passage (105) is connected to one interface of a liquid pump (106), the other interface of the liquid pump (106) is connected to the first oil passage (103), and a hydraulic oil disconnecting assembly (5) is provided in the middle of the third oil passage (105) provided in the slip support inner core (1).

5. A high load pneumatic slip according to claim 1, characterized in that: Sealing strip annular grooves are provided on the back conical surface of the slip valve (2) and on the outer peripheries of the first oil chamber (203) and the second oil chamber (204), and wear-resistant sealing strips (205) are provided in the sealing strip annular grooves. Side sealing plates (102) are integrally formed on both sides of the landslide step groove (101) in the inner cavity of the slip valve supporting inner core (1), and the wear-resistant sealing strips (205) provided on the outer peripheries of the first oil chamber (203) and the second oil chamber (204) are tightly fitted to the surfaces of the landslide step groove (101) and the side sealing plates (102).

6. A high load pneumatic slip according to claim 5, characterized in that: The two side surfaces of the slip (2) are parallel planes, and the side sealing plates (102) provided on the two sides of the landslide step groove (101) are in contact with the two side surfaces of the slip (2).

7. A high load pneumatic slip according to claim 1, characterized in that: The outer wall of the slip support inner core (1) is provided with a hydraulic detection channel connected to the first oil chamber (203), and an outer port of the hydraulic detection channel is connected to an oil pressure detector (107).

8. A high load pneumatic slip according to claim 7, characterized in that: The oil pressure detector (107) is signal-connected to a processor, and the processor is connected to a low-pressure alarm module.

9. A high load pneumatic slip according to claim 4, characterized in that: The hydraulic oil circuit breaker assembly (5) comprises a sliding pin groove (501) in the inner part of the slip support inner core (1) and vertically connected to the third oil channel (105); a circuit breaker sliding pin (502) is slidably connected in the sliding pin groove (501); an oil hole (503) is provided in the middle of the circuit breaker sliding pin (502); and a pressure spring (505) is connected between the outer end of the circuit breaker sliding pin (502) and the inner cavity side wall of the sliding pin groove (501).

10. A high load pneumatic slip according to claim 9, characterized in that: The outer end of the disconnecting sliding pin (502) is connected to an armature (504), and a slip supports the outer wall of the inner core (1) and an electromagnet (506) is provided at a position corresponding to the disconnecting sliding pin (502), and a magnetized end (507) of the electromagnet (506) corresponds to the position of the armature (504).

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