Air inlet assembly for cable blowout preventer

Abstract

The utility model discloses an air inlet assembly for a cable blowout preventer. The air inlet assembly comprises a connecting body, a lining and an air inlet pipeline, a plurality of radial through holes are evenly formed in the side wall of the connecting body in the circumferential direction. The lining is arranged in the connecting body in a sleeved mode, an axial through hole is formed in the center of the lining, oblique through holes communicated with the axial through hole are formed backwards in the outer wall of the lining in the oblique direction, and the multiple oblique through holes are evenly distributed in the circumferential direction and communicated with the multiple radial through holes respectively. The air inlet pipeline comprises an air inlet main pipe, a plurality of air inlet branch pipes and a plurality of check valves; one ends of a plurality of check valves are respectively connected with a plurality of radial through holes in the connecting body in a manner that gas is conveyed from outside to inside of the radial through holes, the other ends of the check valves are respectively connected with one ends of a plurality of gas inlet branch pipes, and the other ends of the gas inlet branch pipes are connected with one end of a gas inlet header pipe through a multi-way short section; the air inlet assembly is simple in structure, convenient to install and operate, capable of safely and effectively recycling sealing grease, high in practicability and high in working efficiency, and cables do not need to be independently cleaned after operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable anti -blowout device technical field, especially in a cable anti -blowout device air inlet subassembly for use. BACKGROUND

[0002] In the cable anti -blowout device field operation, the cable on the downhole often adheres to a layer of seal grease. At present, although the existing cable anti -blowout box assembly is provided with a scraping oil ring in the design of structure, but the seal grease adhered to the cable cannot be scraped completely, so that the seal grease still adheres to the cable during the cable lifting operation, and additional cleaning is needed, and the seal grease is difficult to clean due to its high viscosity; in addition, the seal grease cannot be recycled effectively in the cable anti -blowout box assembly, which also causes waste of seal grease and environmental pollution. Therefore, it is necessary to improve the scraping oil structure of the existing cable anti -blowout box assembly to realize safe and effective recycling of seal grease and cleaning of cable seal grease. SUMMARY

[0003] The utility model aims at providing a cable anti -blowout device air inlet subassembly which solves the problems of the prior art.

[0004] Therefore, the utility model technical scheme is as follows:

[0005] A cable anti -blowout device air inlet subassembly, comprising a connecting body, a bushing and an air inlet pipeline, wherein a plurality of radial through holes are uniformly distributed on the side wall of the connecting body in the circumferential direction; the bushing is sleeved in the connecting body, an axial through hole is formed in the center of the bushing, a plurality of oblique through holes are obliquely formed from the outer wall of the bushing to the rear, the plurality of oblique through holes are uniformly distributed in the circumferential direction and correspond to and communicate with the plurality of radial through holes one by one; the air inlet pipeline comprises an air inlet main pipe, a plurality of air inlet branch pipes and a plurality of one-way valves; one end of the plurality of one-way valves is connected with and communicates with the plurality of radial through holes on the connecting body in the form of gas supply from the outside to the radial through hole, and the other end of the plurality of one-way valves is connected with and communicates with one end of the plurality of air inlet branch pipes, and the other end of the plurality of air inlet branch pipes is connected with and communicates with one end of the air inlet main pipe through a multi-pass nipple.

[0006] Further, the number of radial through holes is preferably 2 or 3; the other end of the one-way valve can be connected with one end of the air inlet branch pipe in a one-to-one correspondence, or the other end of the plurality of one-way valves can be connected with one end of the air inlet branch pipe through a multi-pass joint.

[0007] Further, the inner wall of the front end of the connecting body is recessed to form an inner annular step, and a connecting internal thread and an annular sealing ring are arranged on the recessed inner wall, so that the front end of the connecting body is threadedly connected to the rear end outer wall of the cable protection sleeve of the cable anti -blowout box assembly.

[0008] Further, the rear end of the connector is recessed and formed with an outer annular step, and the outer thread is arranged on the recessed outer wall, so that the rear end of the connector is screwed to the inner wall of the front end of the blowout preventer box, and the front end of the blowout preventer box abuts against the end face of the outer annular step of the connector.

[0009] Further, the bushing is fixed in the connector by a plurality of screws evenly arranged along the circumferential direction of the connector.

[0010] Further, the axial through hole of the bushing is coaxially arranged with the central through hole of the upper bushing arranged in the cable protection sleeve, and the diameters of the two are the same.

[0011] Further, the connecting inner thread is arranged on the outer side hole wall of the radial through hole, so that the radial through hole is connected to one end of the single-flow valve through the first conversion joint.

[0012] Further, the other end of the single-flow valve is connected to one end of the gas inlet branch pipe through the right-angle conversion joint.

[0013] Further, a plug-in quick connector is arranged between the right-angle conversion joint and the gas inlet branch pipe.

[0014] Further, the other end of the gas inlet branch pipe is connected to the multi-pass short section through the second conversion joint.

[0015] Further, a gas source quick connector is connected to the other end of the gas inlet main pipe, so as to be quickly connected to the gas source interface of the external gas source.

[0016] Compared with the prior art, the cable blowout preventer device gas inlet assembly can be added to the cable blowout preventer box assembly of different specifications, and is suitable for all cable operations with grease injection; the gas inlet assembly has simple structure and convenient installation and operation, effectively solves the problem that a layer of sealing grease is adhered to the surface of the cable during the current cable lifting operation, and additional cleaning is required, realizes safe and effective recycling of the sealing grease into the sealing grease recycling cavity in the cable blowout preventer box assembly during the cable lifting operation, and the cable does not need to be cleaned separately after the operation is completed, has strong practicality, effectively improves the work efficiency, and ensures smooth operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic view of the cable blowout preventer device gas inlet assembly of the utility model;

[0018] Figure 2 FIG. 4 is a structural schematic view of a conventional cable blowout preventer box assembly;

[0019] Figure 3 FIG. 5 is a schematic view of the cable blowout preventer device gas inlet assembly added to the conventional cable blowout preventer box assembly;

[0020] Figure 4A schematic diagram of the air intake flow process of the conventional cable blowout preventer box assembly in use. DETAILED DESCRIPTION

[0021] The utility model will be further described below in combination with the drawings and specific embodiments, but the following examples by no means limit the utility model.

[0022] Referring to Figure 1 The cable blowout preventer air intake assembly includes a connecting body 1, a bushing 3, and an air intake pipeline.

[0023] The connecting body 1 is a cylindrical barrel structure; the front end inner wall of the barrel is recessed and forms an inner annular step, and a connecting internal thread and an annular sealing ring 15 are arranged on the recessed inner wall, so that the front end of the barrel is matched with the external thread on the rear end outer wall of the cable protection sleeve 16 of the cable blowout preventer box assembly, the front end of the connecting body 1 is threadedly connected to the rear end outer wall of the cable protection sleeve 16, and the rear end of the upper bushing 17 arranged in the cable protection sleeve 16 is arranged in a gap manner with the end face of the inner annular step of the connecting body 1, so as to control the degree of thread connection between the connecting body 1 and the upper bushing 17 according to the gap distance therebetween, and avoid excessive extrusion on the annular sealing ring 15; the rear end outer wall of the barrel is recessed and forms an outer annular step, and a connecting external thread is arranged on the recessed outer wall, so that the rear end of the barrel is matched with the front end of the blowout preventer box 18 of the cable blowout preventer box assembly, the rear end of the connecting body 1 is threadedly connected to the inner wall of the front end of the blowout preventer box 18, and the front end of the blowout preventer box 18 abuts against the end face of the outer annular step of the connecting body 1.

[0024] The bushing 3 is sleeved in the connecting body 1 and is fixed in the connecting body 1 by a plurality of screws 2 uniformly distributed along the circumferential direction of the connecting body 1; in this embodiment, the screws 2 are hexagonal taper screws and are arranged on the front side barrel wall of the connecting body 1.

[0025] An axial through hole is formed in the center of the bushing 3, and the hole diameter of the axial through hole is preferably consistent with the hole diameter of the central through hole of the upper bushing 17 arranged in the cable protection sleeve 16, so that when the connecting body 1 is connected to the cable protection sleeve 16, the axial through hole of the bushing 3 and the central through hole of the upper bushing 17 are coaxially arranged and penetrate through.

[0026] Two radial through holes are symmetrically formed in the side wall of the connecting body 1, and two inclined through holes 301 are symmetrically formed in the side wall of the bushing 3, both of which are inclinedly formed from the outer wall of the bushing 3 to the inner wall of the bushing 3 and penetrate through the inner wall of the bushing 3, and the two inclined through holes 301 are respectively connected to the two radial through holes, so that the axial through hole of the bushing 3 and the two radial through holes on the connecting body 1 penetrate through; preferably, the two radial through holes are formed on the rear side barrel wall of the connecting body 1.

[0027] The air inlet pipeline comprises an air inlet main pipe 12, two air inlet branch pipes 9 and two one-way valves 7; a connecting internal thread is arranged on the outer hole wall of each radial through hole to install the first conversion joint 8 in the radial through hole, so that the one-way valve 7 is connected to the first conversion joint 8 in a manner of sending air from the outside to the radial through hole; the other end of the one-way valve 7 is connected to the right-angle conversion joint 4, so that the one-way valve 7 is connected to one end of the air inlet branch pipe 9 through the right-angle conversion joint 4, and at the same time, the connection direction of the pipeline is converted from the radial direction of the cable blowout preventer assembly to the axial direction of the cable blowout preventer assembly; the other end of the air inlet branch pipe 9 is connected to the second conversion joint 10, so that the other end of the two air inlet branch pipes 9 is converted to the same size as the end of the air inlet main pipe 12, and then the other end of the two is connected and communicated with one end of the air inlet main pipe 12 through the tee joint 11; wherein the tee joint is a Y-shaped tee joint, the two air inlet branch pipes 9 are of the same size, and the airflow in the air inlet main pipe 12 is evenly distributed into the two air inlet branch pipes 9; the other end of the air inlet main pipe 12 is connected to the gas source interface of the external gas source through the third conversion joint 13.

[0028] In the embodiment, the first conversion joint 8 is a double-male joint, the one-way valve 7 is a one-way valve with a double-female joint, the right-angle conversion joint 4 is a double-male right-angle conversion joint, the air inlet branch pipe 9 and the air inlet main pipe 12 are pipe bodies with double-female joints, and the second conversion joint 10 and the third conversion joint 13 are female-to-male joints.

[0029] As a preferred technical solution of the embodiment, the other end of the right-angle conversion joint 4 is connected to the plug-in quick connector 5, so that in the use state, the plug-in quick connector 5 can be quickly connected with the gas conveying pipeline (i.e. the air inlet branch pipe 9 and the air inlet main pipe 12), and in the non-use state, the plug-in quick connector 5 is convenient to disassemble and store; preferably, the two plug-in parts of the plug-in quick connector 5 are respectively matched with the caps 6.

[0030] As a preferred technical solution of the embodiment, the gas source quick connector 14 is arranged between the third conversion joint 13 and the gas source interface of the external gas source, so that in the use state, the air inlet main pipe 12 can be quickly connected with the external gas source through the plug-in connection; in the embodiment, the gas source quick connector is a Chicago quick connector.

[0031] As Figure 2 shows a structure schematic diagram of a conventional cable blowout preventer assembly. In actual application, the cable blowout preventer device of the embodiment is added with the air inlet assembly on the conventional cable blowout preventer assembly, and specifically, the bushing 3 of the air inlet assembly is added between the cable protection sleeve 16 and the blowout preventer 18, as Figure 3 shows.

[0032] Referring to Figure 4, the cable blowout preventer assembly installed with the air inlet assembly can realize safe and effective grease recovery and cable grease cleaning during actual operation on site. The working process is described as follows.

[0033] The other end of the air inlet manifold 12 in the air inlet assembly is connected with the gas source to ventilate the air inlet pipeline through the gas source; the gas flow entering the air inlet manifold 12 is evenly divided into two air inlet branch pipes 9 through the Y-shaped tee joint, and then pumped into the plurality of radial through holes of the connecting body 1 through the one-way valve 7, and then pumped backward through the oblique through holes evenly arranged on the bushing 3, that is, the backward flow of the gas flow is formed in the rear part of the axial through hole of the bushing 3; the cable 20 is lifted in the direction of the arrow as shown in the figure, the movement direction of the cable 20 is opposite to the direction of the gas flow formed in the axial through hole of the bushing 3, and the movement directions of the two are opposite, so that the sealing grease attached to the surface of the cable 20 is blown off the outer wall of the cable 20 under the pushing of the gas flow and blown backward, so that the sealing grease moves backward and is stored in the recovery chamber arranged at the front end of the blowout preventer 18, and the overflow joint 19 connected with the recovery chamber is used to balance the pressure change in the recovery chamber or overflow.

[0034] The cable blowout preventer assembly with the air inlet assembly is put into actual operation, the gas supply pressure of the air inlet manifold is set to 0.7 MPa, and then the cable is lifted, the surface of the cable is smooth, and there is no sealing grease attached; the actual application effect proves that the installation of the air inlet assembly on the cable blowout preventer assembly can indeed realize effective scraping and recovery of the sealing grease attached to the cable.

[0035] In summary, the air inlet assembly for the cable blowout preventer device can ensure that the sealing grease on the cable is cleaned and effectively recovered without wasting the sealing grease, the sealing grease recovery reduces the pollution to the environment, and the cable does not need to be cleaned separately after the operation is completed, which reduces the operation cost and maintenance cost, improves the work efficiency, and provides more environmental protection and operation safety for the site.

Claims

1. An air intake assembly for a cable blowout preventer, characterized in that, The system includes a connector (1), a bushing (3), and an intake pipe. The connector (1) has multiple radial through holes evenly distributed along the circumference on its side wall. The bushing (3) is fitted inside the connector (1) and has an axial through hole at its center. An oblique through hole is opened from the outer wall of the bushing (3) in a backward direction, which communicates with the axial through hole. The multiple oblique through holes are evenly distributed along the circumference and correspond to and communicate with the multiple radial through holes. The intake pipe includes an intake manifold (12), multiple intake branch pipes (9), and multiple check valves (7). One end of each check valve (7) is connected to the multiple radial through holes on the connector (1) and communicates with them by conveying air from the outside to the radial through holes. The other end of each check valve (7) is connected to one end of each of the multiple intake branch pipes (9) and communicates with them. The other end of each intake branch pipe (9) is connected to one end of the intake manifold (12) through a multi-port short section (11) and communicates with it.

2. The air intake assembly for the cable blowout preventer according to claim 1, characterized in that, The front end of the connector (1) is recessed and has an inner annular step. The inner wall of the recess is provided with a connecting internal thread and an annular sealing ring, so that the front end of the connector (1) is threadedly connected to the rear end outer wall of the cable protection sleeve (16) of the cable blowout box assembly.

3. The air intake assembly for the cable blowout preventer according to claim 1, characterized in that, The outer wall of the rear end of the connector (1) is recessed and forms an outer annular step, and an external thread is provided on the recessed outer wall, so that the rear end of the connector (1) is threaded to the inner wall of the front end of the blowout preventer (18), and the front end of the blowout preventer (18) abuts against the end face of the outer annular step of the connector (1).

4. The air intake assembly for the cable blowout preventer according to claim 1, characterized in that, The bushing (3) is fixed inside the connector (1) by a number of screws (2) evenly distributed along the circumference of the connector (1).

5. The air intake assembly for the cable blowout preventer according to claim 1, characterized in that, The axial through hole of the bushing (3) can be coaxially arranged with the central through hole of the upper bushing (17) built into the cable protection sleeve (16), and the two holes have the same diameter.

6. The air intake assembly for the cable blowout preventer according to claim 1, characterized in that, A connecting internal thread is provided on the outer wall of the radial through hole, so that the radial through hole is connected to one end of the check valve (7) through the first conversion joint (8).

7. The air intake assembly for the cable blowout preventer according to claim 1, characterized in that, The other end of the single-flow valve (7) is connected to one end of the intake branch pipe (9) via a right-angle adapter (4).

8. The air intake assembly for the cable blowout preventer according to claim 7, characterized in that, A plug-in quick connector (5) is also provided between the right-angle adapter (4) and the intake manifold (9).

9. The air intake assembly for the cable blowout preventer according to claim 1, characterized in that, The other end of the intake manifold (9) is connected to the multi-port short section (11) via the second adapter (10).

10. The air intake assembly for the cable blowout preventer according to claim 1, characterized in that, A quick-connect fitting for air supply is connected to the other end of the intake manifold (12) for quick connection to the air supply interface of an external air source.

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