Eccentric double-piston composite ram blowout preventer

Abstract

The utility model discloses an eccentric double-piston composite flashboard blowout preventer which comprises a shell, suspension semi-closed composite flashboard assemblies are symmetrically installed on the shell, end cover assemblies are installed on the suspension semi-closed composite flashboard assemblies, locking hand wheels used for locking and sealing the end cover assemblies are installed at the tail ends of the end cover assemblies, and the tail ends of the locking hand wheels are connected with the shell. A suspension piston mechanism and a semi-sealing piston mechanism are installed in the end cover assembly. Due to the fact that the flashboard assembly is driven by the end cover assembly, after the flashboard is closed, a cylindrical coiled tubing made of alloy steel materials is clamped in the middle of the flashboard assembly, double pistons are arranged in the end cover assembly, under the same hydraulic drive, the two pistons move respectively, and the difference between the strokes can be 0-5 mm. Therefore, the difference between the suspension slip and the front seal is made up. The hydraulic force is proportionally distributed through the double pistons, the double pistons also act on the rear ends of the suspension slip and the front seal respectively, eccentric and uneven acting force cannot be caused, and the suspension capacity of the slip and the sealing performance of the semi-sealing rubber can reach the optimal state at the same time.

Description

Technical Field

[0001] This utility model relates to the field of coiled tubing workover technology, and in particular to an eccentric double piston composite gate blowout preventer. Background Technology

[0002] A coiled tubing blowout preventer (BOP) is a well control device used in coiled tubing operations. Its function is to hydraulically close the gate rapidly, sealing the wellhead pressure and preventing blowouts. A conventional coiled tubing BOP consists of four gates, from top to bottom: a full-sealing gate, a shearing gate, a suspension gate, and a semi-sealing gate. This structure results in a large size and high cost for the BOP. Consequently, composite gate BOPs have emerged. Composite gates combine the full-sealing and shearing functions on one gate, or the suspension and semi-sealing functions on another. The suspension, semi-sealing, and composite gates are controlled by a set of hydraulic cylinders. However, because the compression of the semi-sealing rubber of the slips is not the same, the set of hydraulic cylinders cannot precisely coordinate and control their stroke, resulting in the slip suspension capacity and the sealing performance of the semi-sealing rubber not reaching their optimal state simultaneously. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies, the purpose of this utility model is to provide an eccentric double piston composite gate blowout preventer.

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

[0005] An eccentric double-piston composite gate blowout preventer includes: a housing, on which a suspended semi-sealed composite gate assembly is symmetrically mounted, an end cap assembly is mounted on the suspended semi-sealed composite gate assembly, a locking handwheel for locking and sealing the end cap assembly is mounted at the end of the end cap assembly, and a suspended piston mechanism and a semi-sealed piston mechanism are installed inside the end cap assembly.

[0006] An annular sealing mechanism is installed between the suspended semi-enclosed composite gate assembly and the end cover assembly.

[0007] The end cap assembly includes: an end cap, on which a hydraulic cylinder is mounted, wherein an independently operating suspension piston mechanism and a semi-sealed piston mechanism are provided inside the hydraulic cylinder, a hydraulic cylinder cover is mounted on the hydraulic cylinder, and a locking seat is mounted on the hydraulic cylinder cover.

[0008] The suspended piston mechanism includes: a piston installed in a hydraulic cylinder, and a suspended piston rod is installed on the piston; the semi-sealed piston mechanism includes: a semi-sealed piston installed in a hydraulic cylinder, and a semi-sealed piston rod is installed on the semi-sealed piston.

[0009] The locking handwheel includes a suspension locking handwheel connected to the end of the suspension piston rod and a semi-locking handwheel connected to the end of the semi-locking piston rod.

[0010] The semi-sealed piston is embedded in the piston, and the piston rod is divided into upper and lower piston rods, which are respectively installed at both ends of the piston.

[0011] The end cap assembly is equipped with a first guide rod and a second guide rod.

[0012] The end cap is installed on the housing by end cap bolts.

[0013] The suspended semi-sealed composite gate assembly includes: a gate body, in which a suspension slip and a front seal are installed, and a top seal is installed on the outside of the gate body. A slip pusher is connected to the suspension slip, and the slip pusher is connected to the end cover assembly.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention provides an eccentric dual-piston composite gate blowout preventer. Since the gate assembly is driven by the end cap assembly, after the gate is closed, a cylindrical continuous oil pipe made of alloy steel is clamped in the middle. The end cap assembly contains two pistons. Under the same hydraulic drive, the two pistons move independently, with a stroke difference of 0-5mm. This compensates for the difference formed by the suspension slips and the front seal. The dual pistons also proportionally distribute the hydraulic pressure, and each piston acts independently on the rear end of the suspension slips and the front seal, preventing uneven force distribution and achieving optimal suspension capacity of the slips and sealing performance of the semi-sealed rubber simultaneously. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the eccentric double piston composite gate blowout preventer of this utility model;

[0017] Figure 2 This is a schematic diagram of the eccentric double piston composite gate blowout preventer cover assembly of this utility model;

[0018] Figure 3 This is a schematic diagram of the locking handwheel structure of the eccentric double piston composite gate blowout preventer of this utility model;

[0019] Figure 4 This is a schematic diagram of the suspended semi-sealed composite gate structure of the eccentric double piston composite gate blowout preventer of this utility model.

[0020] In the diagram, 1—end cover assembly; 2—suspended semi-sealed composite gate assembly; 3—housing; 4—locking handwheel; 5—annular sealing mechanism; 1-1—end cover; 1-2—suspended piston rod; 1-3—cylinder; 1-4—piston; 1-5—cylinder cover; 1-6—locking seat; 1-8—semi-sealed piston; 1-9—semi-sealed piston rod; 1-10—end cover bolt; 1-11—first guide rod; 1-12—second guide rod; 4-1—suspended locking handwheel; 4-2—semi-sealed locking handwheel. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0022] like Figure 1 As shown, this utility model provides an eccentric double piston composite gate blowout preventer, comprising: a housing 3, on which a suspended semi-sealed composite gate assembly 2 is symmetrically mounted, and an end cap assembly 1 is mounted on the suspended semi-sealed composite gate assembly 2; a locking handwheel 4 for locking and sealing the end cap assembly 1 is mounted at the end of the end cap assembly 1, and a suspended piston mechanism and a semi-sealed piston mechanism are installed inside the end cap assembly 1.

[0023] The shell 3 is equipped with a suspended semi-sealed composite gate assembly 2. The end cap assembly 1 is connected to the shell 3 by end cap bolts 1-10. The blowout preventer is designed with an upper flange connection and a lower flange connection to the wellhead of the production tree. The internal pressure is high during operation.

[0024] Specifically, such as Figure 2 , 3 As shown, end cap 1-1, on which a hydraulic cylinder 1-3 is installed, the hydraulic cylinder 1-3 is provided with an independently operating suspended piston mechanism and a semi-sealed piston mechanism, the hydraulic cylinder 1-3 is equipped with a hydraulic cylinder cover 1-5, and the hydraulic cylinder cover 1-5 is equipped with a locking seat 1-6.

[0025] The suspension piston mechanism includes a piston 1-4 installed within the hydraulic cylinder 1-3, with a suspension piston rod 1-2 mounted on the piston 1-4. The piston 1-4 divides the hydraulic cylinder 1-3 into an open oil chamber and a closed oil chamber. The semi-sealed piston mechanism includes a semi-sealed piston 1-8 installed within the hydraulic cylinder 1-3, with a semi-sealed piston rod 1-9 mounted on the semi-sealed piston 1-8. The locking handwheel 4 includes a suspension locking handwheel 4-1 connected to the end of the suspension piston rod 1-2 and a semi-sealing locking handwheel 4-2 connected to the end of the semi-sealed piston rod 1-9. After the gate is closed, the piston rod is fixed in place by the locking handwheel, and the hydraulic control pressure is released, thus maintaining the suspension and sealing capabilities.

[0026] Preferably, the semi-sealed piston 1-8 is embedded in the piston 1-4, and the suspension piston rod 1-2 is divided into upper and lower piston rods, which are respectively installed at both ends of the piston 1-4.

[0027] Furthermore, in this utility model, an annular sealing mechanism 5 is installed between the end cover 1-1 and the suspended semi-sealed composite gate assembly 2, and a first guide rod 1-11 and a second guide rod 1-12 are installed on the end cover assembly 1.

[0028] like Figure 4 As shown, in this utility model, the suspended semi-sealed composite gate assembly 2 includes: a gate body 2-2, a suspension slip 2-1 and a front seal 2-5 installed inside the gate body 2-2, a top seal 2-3 installed outside the gate body 2-2, a slip pusher 2-4 connected to the suspension slip 2-1, and the slip pusher 2-4 connected to the suspension piston rod 1-2 on the end cover assembly 1.

[0029] Working principle of this utility model:

[0030] The suspension slip 2-1 of the suspended semi-sealed composite gate blowout preventer is made of alloy steel, and the front seal 2-5 is made of rubber, both mounted on the gate body 2-2. The entire gate assembly is driven by the end cap assembly 1. When the suspended semi-sealed composite gate assembly 2 is closed, a cylindrical continuous hydraulic tube made of alloy steel is clamped in the middle. After the suspension slip 2-1 contacts the continuous hydraulic tube, it can hardly move forward, but the front seal can still move forward 1-3 mm after contacting the continuous hydraulic tube. This results in different strokes for the suspension slip 2-1 and the front seal 2-5, although mounted on the same gate body. The end cap assembly 1 contains two pistons. Under the same hydraulic drive, the two pistons move independently, with a stroke difference of 0-5 mm. This compensates for the difference between the suspension slip and the front seal. The two pistons also proportionally distribute the hydraulic pressure, and each piston acts on the rear end of the suspension slip 2-1 and the front seal 2-5, preventing uneven force distribution. Locking handwheels 4 are installed at the rear of both pistons. After the gate is closed, the locking handwheels 4 slide from the side to the rear of the piston and can be manually tightened to achieve the locking function. After locking, the hydraulic pressure is removed, and the suspension and sealing capabilities can be maintained for a long time without hydraulic pressure.

[0031] It will be apparent to those skilled in the art that the above specific examples are merely preferred embodiments of this utility model. Therefore, any improvements or modifications that those skilled in the art may make to certain parts of this utility model still embody the principles of this utility model and achieve its purpose, and all fall within the scope of protection of this utility model.

Claims

1. An eccentric double-piston composite gate blowout preventer, characterized in that, include: The housing (3) is symmetrically equipped with a suspended semi-sealed composite gate assembly (2), and an end cap assembly (1) is installed on the suspended semi-sealed composite gate assembly (2). A locking handwheel (4) for locking and sealing the end cap assembly (1) is installed at the end of the end cap assembly (1). A suspended piston mechanism and a semi-sealed piston mechanism are installed inside the end cap assembly (1).

2. The eccentric double-piston composite gate blowout preventer according to claim 1, characterized in that, An annular sealing mechanism (5) is installed between the suspended semi-enclosed composite gate assembly (2) and the end cover assembly (1).

3. The eccentric double-piston composite gate blowout preventer according to claim 1 or 2, characterized in that, The end cap assembly (1) includes: an end cap (1-1), a hydraulic cylinder (1-3) mounted on the end cap (1-1), an independently operating suspension piston mechanism and a semi-sealed piston mechanism being provided inside the hydraulic cylinder (1-3), a hydraulic cylinder cover (1-5) mounted on the hydraulic cylinder (1-3), and a locking seat (1-6) mounted on the hydraulic cylinder cover (1-5).

4. The eccentric double-piston composite gate blowout preventer according to claim 3, characterized in that, The suspended piston mechanism includes: a piston (1-4) installed in the hydraulic cylinder (1-3), and a suspended piston rod (1-2) is installed on the piston (1-4); the semi-sealed piston mechanism includes: a semi-sealed piston (1-8) installed in the hydraulic cylinder (1-3), and a semi-sealed piston rod (1-9) is installed on the semi-sealed piston (1-8).

5. The eccentric double-piston composite gate blowout preventer according to claim 4, characterized in that, The locking handwheel (4) includes a suspension locking handwheel (4-1) connected to the end of the suspension piston rod (1-2) and a semi-locking locking handwheel (4-2) connected to the end of the semi-locking piston rod (1-9).

6. The eccentric double-piston composite gate blowout preventer according to claim 4 or 5, characterized in that, The semi-sealed piston (1-8) is embedded in the piston (1-4), and the suspended piston rod (1-2) is divided into upper and lower piston rods, which are respectively installed at both ends of the piston (1-4).

7. The eccentric double-piston composite gate blowout preventer according to claim 3, characterized in that, The end cap assembly (1) is equipped with a first guide rod (1-11) and a second guide rod (1-12).

8. The eccentric double-piston composite gate blowout preventer according to claim 7, characterized in that, The end cap (1-1) is installed on the housing (3) by end cap bolts (1-10).

9. The eccentric double-piston composite gate blowout preventer according to claim 1, characterized in that, The suspended semi-sealed composite gate assembly (2) includes: a gate body (2-2), a suspension slip (2-1) and a front seal (2-5) installed inside the gate body (2-2), a top seal (2-3) installed outside the gate body (2-2), a slip pusher (2-4) connected to the suspension slip (2-1), and the slip pusher (2-4) connected to the end cover assembly (1).

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