Wellhead quick connecting device for operation under pressure

Abstract

The utility model relates to the technical field of wellhead devices, in particular to an under-pressure operation wellhead quick connecting device which comprises a lower connecting flange, an upper connecting flange and a rectangular frame, movable plates are symmetrically installed in the rectangular frame in a sliding mode, and arc-shaped clamping blocks are fixedly installed on the two movable plates. Two first threaded rods are horizontally and rotationally installed on the rectangular frame, the spiral directions of the left ends and the right ends of the two first threaded rods are opposite, the two first threaded rods are sleeved with the movable plate in a threaded mode, and a transmission assembly used for driving the two first threaded rods to rotate at the same time is arranged on the rectangular frame. The two threaded rods are driven by the transmission assembly to rotate at the same time, then the two arc-shaped clamping blocks are driven by the movable plate and the mounting block to get close to each other, the upper connecting flange and the lower connecting flange are clamped between the two arc-shaped clamping blocks, connection can be completed, bolts are not needed, mounting and dismounting are more convenient, and the defects of flange connection are overcome.

Description

TECHNICAL FIELD

[0001] The utility model relates to wellhead device technical field especially relates to a kind of wellhead quick connecting device with pressure operation. BACKGROUND

[0002] In high-pressure shallow plug drilling operation, in order to not increase wellhead height, short tubing operation needs to be used, so that single pipe needs to be connected frequently, and in the operation, the wellhead and the part above the ground are disassembled, and the traditional connection mode of the blowout preventer of the wellhead is usually flange connection.

[0003] This connection mode is more firm, and is suitable for wellhead that is not disassembled frequently. Since short tubing operation is used in the above-mentioned plug drilling operation under pressure, the wellhead needs to be disassembled frequently to connect single pipe, so that the flange-connected wellhead blowout preventer uses more bolts, and disassembly is time-consuming and laborious. INVENTION CONTENTS

[0004] The utility model aims at solving the following shortcomings in the prior art and provides a kind of wellhead quick connecting device with pressure operation.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A kind of wellhead quick connecting device with pressure operation, including lower connection flange, upper connection flange and rectangular frame, the mobile plate is symmetrically slidably installed in the rectangular frame by sliding assembly, the opposite side of two mobile plates is fixedly installed with mounting block, two mounting blocks are fixedly installed with arc clamping block, the opposite side of two arc clamping blocks is equipped with the card slot with the longitudinal section of trapezoidal;Two first screw rods are rotatably installed on the rectangular frame, and the screw directions of the left and right ends of two first screw rods are opposite, the mobile plate is threadedly sleeved on two first screw rods, and the transmission assembly for simultaneously driving two first screw rods to rotate is provided on the rectangular frame.

[0007] In order to better achieve the above-mentioned purpose, the utility model adopts further technical scheme: the mobile slot is symmetrically provided in the inner wall of the rectangular frame, and the sliding assembly includes two sliders fixedly installed with the two ends of the mobile plate respectively, and two sliders are slidably arranged in two mobile slots.

[0008] In order to better achieve the above-mentioned purpose, the utility model adopts further technical scheme: the transmission assembly includes a worm rotatably installed on the rectangular frame, two worm gears fixedly sleeved on two first screw rods and a rocking handle fixedly installed at one end of the worm, and two worm gears are meshed and connected with the worm.

[0009] In order to better achieve the above object, the utility model adopts further technical scheme: the worm is fixedly installed with round plate at one end far from the shaking handle, the rectangular frame is equipped with limiting component for limiting round plate rotation.

[0010] In order to better achieve the above object, the utility model adopts further technical scheme: the limiting component includes the support fixedly installed on the rectangular frame, the second screw rod rotationally installed on the support, the resistance block fixedly installed at one end of the second screw rod and the adjusting block fixedly installed at the other end of the second screw rod, the support is equipped with threaded hole, the second screw rod is inserted in the threaded hole in the threaded mode, and the resistance block contacts with the round plate.

[0011] In order to better achieve the above object, the utility model adopts further technical scheme: the resistance block is fixedly installed with antiskid pad on the side close to the round plate, and the antiskid pad is rubber pad.

[0012] The utility model has the advantages of:

[0013] 1, when connecting, the rectangular frame is sleeved between the upper connecting flange and the lower connecting flange, then the two screw rods are driven to rotate simultaneously through the transmission assembly, then the two arc clamping blocks are driven to approach each other through the moving plate and the mounting block, the upper connecting flange and the lower connecting flange are clamped between the two arc clamping blocks, the connection can be completed, the bolt is not needed, and the installation and dismounting are more convenient, and the disadvantages of flange connection are solved.

[0014] 2, through the cooperation of the second screw rod, the resistance block and the round plate, greater friction is generated at one end of the worm, the self-rotation of the worm is avoided due to vibration during operation, and the sealing property of the upper connecting flange and the lower connecting flange is influenced. DRAWINGS

[0015] Figure 1 It is a front view three-dimensional structure schematic diagram of the utility model;

[0016] Figure 2 It is a side view three-dimensional structure schematic diagram of the utility model;

[0017] Figure 3 It is a three-dimensional structure schematic diagram of the moving plate and the arc clamping block;

[0018] Figure 4 It is Figure 1 It is the structure enlarged view of A in the middle;

[0019] Figure 5 It is Figure 2 It is the structure enlarged view of B in the middle.

[0020] In the figure: 1 lower connecting flange, 2 upper connecting flange, 3 rectangular frame, 4 moving plate, 5 mounting block, 6 arc-shaped clamping block, 7 clamping groove, 8 first threaded rod, 9 moving groove, 10 sliding block, 11 worm, 12 worm wheel, 13 rocking handle, 14 round plate, 15 support, 16 second threaded rod, 17 resistance block, 18 adjusting block. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0022] Reference Figures 1-5 A kind of quick connecting device of wellhead with pressure operation, including lower connecting flange 1, upper connecting flange 2 and rectangular frame 3, moving plate 4 is symmetrically slidably installed in rectangular frame 3 by sliding assembly, the opposite side of two moving plates 4 is fixedly installed with mounting block 5, two mounting blocks 5 are fixedly installed with arc-shaped clamping block 6, the opposite side of two arc-shaped clamping blocks 6 is all provided with clamping groove 7 with longitudinal section being trapezoidal, upper connecting flange 2 is connected with wellhead blowout preventer, lower connecting flange 1 is connected with the blowout pipe of wellhead, when connecting, one end of upper connecting flange 2 is inserted into lower connecting flange 1, two first threaded rods 8 are horizontally rotatably installed on rectangular frame 3, the screw direction of left and right ends of two first threaded rods 8 is opposite, moving plate 4 is threadedly sleeved on two first threaded rods 8, rectangular frame 3 is equipped with transmission assembly for simultaneously driving two first threaded rods 8 to rotate, transmission assembly includes worm 11 rotatably installed on rectangular frame 3, two worm wheels 12 respectively fixedly sleeved on two first threaded rods 8 and rocking handle 13 fixedly installed at one end of worm 11, two worm wheels 12 are all meshed with worm 11.

[0023] When connecting upper connecting flange 2 and lower connecting flange 1, rectangular frame 3 is sleeved on upper connecting flange 2 and lower connecting flange 1, two arc-shaped clamping blocks 6 are moved to the two sides of upper connecting flange 2 and lower connecting flange 1 simultaneously, then rocking handle 13 is rotated, drives worm 11 to rotate, under the rotation of worm 11, two worm wheels 12 can be simultaneously driven to rotate, in turn, two first threaded rods 8 are simultaneously driven to rotate by worm wheel 12, since moving plate 4 is threadedly sleeved on first threaded rod 8, when first threaded rod 8 rotates, two moving plates 4 can be driven to approach each other, in turn, two arc-shaped clamping blocks 6 approach each other, at this time, lower end of upper connecting flange 2 and upper end of lower connecting flange 1 are inserted into clamping groove 7 provided in arc-shaped clamping block 6, and simultaneously contact with the two side slopes of clamping groove 7, under the extrusion of clamping groove 7, upper connecting flange 2 and lower connecting flange 1 are tightly connected together, in the process of connection, without using bolt, installation and disassembly are more convenient, solve the disadvantages of flange connection.

[0024] The worm 11 and the worm wheel 12 have one-way transmission, when the two arc-shaped clamping blocks 6 clamp the upper connecting flange 2 and the lower connecting flange 1 together, the two first threaded rods 8 can be effectively prevented from loosening without rotating the worm 11, and the sealing property of the connection between the upper connecting flange 2 and the lower connecting flange 1 is affected.

[0025] The inner wall of the rectangular frame 3 is symmetrically provided with moving grooves 9, the sliding assembly comprises two sliders 10 fixedly installed at two ends of the moving plate 4, the two sliders 10 are slidably arranged in the two moving grooves 9, the sliders 10 at the two ends of the moving plate 4 are slidably arranged in the moving grooves 9, and the moving grooves 9 are horizontally arranged on the rectangular frame 3, when the first threaded rod 8 rotates, under the action of the sliders 10 and the moving grooves 9, the moving plate 4 can be horizontally moved on the rectangular frame 3.

[0026] The worm 11 is fixedly installed with a circular plate 14 away from the rocking handle 13, the rectangular frame 3 is provided with a limiting assembly for limiting the rotation of the circular plate 14, the limiting assembly comprises a support 15 fixedly installed on the rectangular frame 3, a second threaded rod 16 rotatably installed on the support 15, a resistance block 17 fixedly installed at one end of the second threaded rod 16 and an adjusting block 18 fixedly installed at the other end of the second threaded rod 16, the support 15 is provided with a threaded hole, the second threaded rod 16 is threadedly inserted into the threaded hole, and the resistance block 17 is in contact with the circular plate 14.

[0027] The rotating adjusting block 18 can drive the second threaded rod 16 to rotate, under the action of the threaded hole, the second threaded rod 16 drives the resistance block 17 to move towards the circular plate 14 and is in contact with the circular plate 14, when the resistance block 17 is in contact with the circular plate 14, the friction between them is increased, when the rectangular frame 3 vibrates during the pressing operation, the resistance block 17 can effectively limit the rotation of the worm 11 through the friction, and the sealing property of the connection between the upper connecting flange 2 and the lower connecting flange 1 is affected.

[0028] The resistance block 17 is fixedly installed with a non-slip pad on the side close to the circular plate 14, the non-slip pad is a rubber pad, and the non-slip pad can increase the friction between the resistance block 17 and the circular plate 14, and more effectively prevent the worm 11 from rotating under vibration.

[0029] In the utility model, when connecting upper connecting flange 2 and lower connecting flan 1, rectangular frame 3 is sleeved on upper connecting flange 2 and lower connecting flan 1, two arc-shaped clamping blocks 6 are moved to the two sides of upper connecting flange 2 and lower connecting flan 1, then two first threaded rods 8 are driven to rotate simultaneously through transmission assembly, when first threaded rod 8 rotates, two moving plates 4 can be driven to approach each other, thereby driving two arc-shaped clamping blocks 6 to approach each other, at this moment, the lower end of upper connecting flange 2 and the upper end of lower connecting flan 1 are inserted into the clamping groove 7 of arc-shaped clamping block 6 and simultaneously contact with the two side inclined surfaces of clamping groove 7, under the extrusion of clamping groove 7, upper connecting flange 2 and lower connecting flan 1 are tightly connected together, in the process of connecting, without using bolts, installation and disassembly are more convenient, and the drawbacks of flange connection are solved.

Claims

1. A quick connecting device for wellhead under pressure operation, comprising a lower connecting flange (1), an upper connecting flange (2) and a rectangular frame (3), characterized in that, The rectangular frame (3) is symmetrically slidably installed with a moving plate (4) through a sliding assembly, the opposite side of the two moving plates (4) is fixedly installed with a mounting block (5), the two mounting blocks (5) are fixedly installed with an arc-shaped clamping block (6), the opposite side of the two arc-shaped clamping blocks (6) is provided with a clamping groove (7) with a trapezoidal longitudinal section; the rectangular frame (3) is horizontally rotatably installed with two first threaded rods (8), the left and right ends of the two first threaded rods (8) are oppositely screwed, the moving plate (4) is threadedly sleeved on the two first threaded rods (8), and the rectangular frame (3) is provided with a transmission assembly for simultaneously driving the two first threaded rods (8) to rotate.

2. A quick connect device for a wellhead operating under pressure according to claim 1, characterised in that, The inner wall of the rectangular frame (3) is symmetrically provided with a moving groove (9), and the sliding assembly comprises two sliders (10) fixedly installed at the two ends of the moving plate (4), respectively, and the two sliders (10) are slidably arranged in the two moving grooves (9), respectively.

3. A quick connect device for a wellhead operating under pressure according to claim 2, characterised in that, The transmission assembly comprises a worm (11) rotatably installed on the rectangular frame (3), two worm gears (12) fixedly sleeved on the two first threaded rods (8), respectively, and a rocking handle (13) fixedly installed at one end of the worm (11), and the two worm gears (12) are in meshing connection with the worm (11).

4. A quick connect device for a wellhead operating under pressure according to claim 3, characterised in that, The end of the worm (11) away from the rocking handle (13) is fixedly installed with a circular plate (14), and the rectangular frame (3) is provided with a limiting assembly for limiting the rotation of the circular plate (14).

5. A quick connect device for a wellhead operating under pressure according to claim 4, characterised in that, The limiting assembly comprises a bracket (15) fixedly installed on the rectangular frame (3), a second threaded rod (16) rotatably installed on the bracket (15), a resistance block (17) fixedly installed at one end of the second threaded rod (16), and an adjusting block (18) fixedly installed at the other end of the second threaded rod (16), the bracket (15) is provided with a threaded hole, the second threaded rod (16) is threadedly inserted into the threaded hole, and the resistance block (17) is in contact with the circular plate (14).

6. A quick connect device for a wellhead operating under pressure according to claim 5, characterised in that, The side of the resistance block (17) close to the circular plate (14) is fixedly installed with a non-slip pad, and the non-slip pad is a rubber pad.

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