A semi-automatic gate changing device with no pressure

Abstract

A semi-automatic gate changing device under pressure without well pressure includes a screw motor, a screw, a blowout prevention sleeve, a first O-ring, a second O-ring, a bearing seat, a thrust bearing, a blowout prevention pipe, a pressure sensor, a nut push rod, a sealing plug, a plugging device setting assembly, a plugging device assembly, a third O-ring, and a first flange; after the screw motor drives the plugging device assembly to seal the wellhead four-way, the wellhead gate is removed from the wellhead four-way, and then a new wellhead gate is replaced. The present invention can replace the oilfield wellhead valve under pressure, and the work is electrically operated, which saves time and labor. The replacement process is risk-free.

Description

Technical Field

[0001] The invention relates to a valve replacement tool for oil fields, in particular to a semi-automatic gate replacement device under pressure without well snubbing. Background Art

[0002] A valve is connected to the top and flanges on both sides of the wellhead four-way. The valve is a consumable part. When it needs to be replaced, it is necessary to kill the well or replace it under pressure because there is pressure in the well (≈0~15MPa). Killing the well is costly and complicated, so it is generally not used. Replacing the valve under pressure is highly dangerous. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a semi-automatic gate changing device without well pressure.

[0004] A semi-automatic gate changing device with no well pressure, comprising a screw motor, a screw, a blowout prevention sleeve, a first O-ring, a second O-ring, a bearing seat, a thrust bearing, a blowout prevention pipe, a pressure sensor, a nut push rod, a sealing plug, a plug setting assembly, a plug assembly, a third O-ring, and a first flange;

[0005] The upper end of the lead screw is connected to the lead screw motor, and the blowout prevention sleeve is sleeved on the upper end of the blowout preventer. The upper section of the lead screw is a polished rod, and the lower section of the lead screw is a screw that passes through the blowout prevention sleeve. The lead screw of the polished rod section and the blowout prevention sleeve are sealed with three first O-rings, and a thrust bearing is arranged between the lead screw of the polished rod section and the blowout prevention sleeve at the lower part of the first O-ring with a bearing seat, and a pressure sensor is arranged on the blowout preventer at the lower part of the thrust bearing; a vertical slide groove is arranged on the inner wall of the blowout preventer, a guide block is arranged on the outer wall of the nut push rod, and a threaded hole is arranged in the center of the nut push rod, and the nut push rod is penetrated in the blowout preventer, and the guide block of the nut push rod is located in the vertical slide groove of the blowout preventer, limiting the nut push rod to only move up and down; the lead screw of the screw section passes through the nut push rod and is threadedly connected with the nut push rod, and the rotation of the lead screw can drive the nut push rod to move up and down;

[0006] The lower end of the nut push rod is threadedly connected to the plugging assembly, and a sealing plug is provided on the top of the plugging assembly; the lower end of the plugging assembly is connected to the plugging assembly through an electromagnetic suction cup, which generates electromagnetic force after power is turned on and disappears after power is turned off. The electromagnetic suction cup belongs to the prior art, and its specific structure is not described in detail. The bottom end of the blowout preventer is sleeved with a first flange, and the connection between the inside of the blowout preventer and the first flange is sealed with a third O-ring. The first flange is connected to the flange of the wellhead gate, and the wellhead four-way is connected to the wellhead gate with a second flange. The screw motor and the electromagnetic suction cup are connected to the external power supply through a wire.

[0007] Working process of the present invention:

[0008] Close the wellhead gate, connect the first flange with the flange of the wellhead gate, drive the screw motor to rotate the screw, the rotation of the screw drives the nut push rod to move downward, the nut push rod drives the plug sealing assembly to move downward, the plug sealing assembly drives the plug assembly to move downward, the plug assembly enters the wellhead four-way below and blocks one of its through holes, then, release the connection between the first flange and the flange of the wellhead gate, retain only the plug sealing assembly and the plug assembly, and remove the other parts, then, remove the wellhead gate from the wellhead four-way, replace it with a new wellhead gate, at this time, the new wellhead gate is in an open state, then, connect the first flange with the flange of the new wellhead gate.

[0009] After that, the electromagnetic chuck is powered on to generate suction, which attracts the plug assembly and the plug setting assembly together, and the screw motor drives the screw to rotate, which drives the nut push rod to move forward, and the plug assembly is pulled out from the wellhead four-way. After the plug assembly is lifted over the new wellhead gate, the new wellhead gate is closed, and the components above the first flange are removed, and the replacement of the wellhead gate is completed. The pressure sensor is used to detect the pressure in the blowout preventer.

[0010] The beneficial effects of the present invention are:

[0011] It can replace oilfield wellhead valves under pressure, and the work is electrically operated, saving time and effort. The replacement process is risk-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the present invention.

[0013] Figure 2 It is the upper schematic diagram of the invention.

[0014] Figure 3 It is a schematic diagram of the middle section of the invention.

[0015] Figure 4 It is a schematic diagram of the lower section of the invention. DETAILED DESCRIPTION

[0016] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment includes a screw motor 1, a screw 2, a blowout prevention sleeve 3, a first O-ring 4, a second O-ring 5, a bearing seat 6, a thrust bearing 7, a blowout prevention pipe 8, a pressure sensor 9, a nut push rod 10, a sealing plug 11, a plug setting assembly 12, a plug assembly 13, a third O-ring 14, and a first flange 15;

[0017] The upper end of the lead screw 2 is connected to the lead screw motor 1, and the blowout prevention sleeve 3 is sleeved on the upper end of the blowout prevention pipe 8. The upper section of the lead screw 2 is a polished rod, and the lower section of the lead screw 2 is a screw that passes through the blowout prevention sleeve 3. Three first O-rings 4 are used to seal the lead screw 2 of the polished rod section and the blowout prevention sleeve 3. A thrust bearing 7 is provided between the lead screw 2 of the polished rod section below the first O-ring 4 and the blowout prevention sleeve 3 via a bearing seat 6. A pressure sensor 9 is provided on the blowout prevention pipe 8 below the thrust bearing 7. The blowout prevention pipe 8 is provided with a vertical slide groove 19 on the inner wall, a guide block 20 is provided on the outer wall of the nut push rod 10, a threaded hole is provided at the center of the nut push rod 10, the nut push rod 10 is penetrated in the lubricating preventer 8, the guide block 20 of the nut push rod 10 is located in the vertical slide groove 19 of the lubricating preventer 8, and the nut push rod 10 is limited to move up and down; the lead screw 2 of the screw section passes through the nut push rod 10 and is threadedly connected with the thread of the nut push rod 10, and the rotation of the lead screw 2 can drive the nut push rod 10 to move up and down;

[0018] The lower end of the nut push rod 10 is threadedly connected to the plugging assembly 12, and a sealing plug 11 is provided on the top of the plugging assembly 12; the lower end of the plugging assembly 12 is connected to the plugging assembly 13 through an electromagnetic suction cup, which generates electromagnetic force after power is turned on and disappears after power is turned off. The electromagnetic suction cup belongs to the prior art, and its specific structure is not repeated. The bottom end of the blowout preventer 8 is sleeved with a first flange 15, and the connection between the inside of the blowout preventer 8 and the first flange 15 is sealed with a third O-ring 14. The first flange 15 is connected to the flange of the wellhead gate 16, and the wellhead four-way 18 is connected to the wellhead gate 16 with a second flange 17. The screw motor 1 and the electromagnetic suction cup are connected to the external power supply through a wire.

[0019] Working process of the present invention:

[0020] The wellhead gate 16 is closed, the first flange 15 is connected to the flange of the wellhead gate 16, the screw motor 1 drives the screw 2 to rotate, the rotation of the screw 2 drives the nut push rod 10 to move downward, the nut push rod 10 drives the plugging device sealing assembly 12 to move downward, the plugging device sealing assembly 12 drives the plugging device assembly 13 to move downward, the plugging device assembly 13 enters the wellhead spool 18 below and blocks one of its through holes, then, the first flange 15 is released from the flange connection of the wellhead gate 16, only the plugging device sealing assembly 12 and the plugging device assembly 13 are retained, and the other components are removed, then, the wellhead gate 16 is removed from the wellhead spool 18, and a new wellhead gate 16 is replaced, at this time, the new wellhead gate 16 is in an open state, then, the first flange 15 is connected to the flange of the new wellhead gate 16.

[0021] Afterwards, the electromagnetic suction cup is energized to generate suction, which attracts the plug assembly 13 and the plug sealing assembly 12 together, and the screw motor 1 drives the screw 2 to rotate. The rotation of the screw 2 drives the nut push rod 10 to move forward, and the plug assembly 13 is pulled out from the wellhead four-way 18. After the plug assembly 13 lifts over the new wellhead gate 16, the new wellhead gate 16 is closed, and the components above the first flange 1 are removed to complete the replacement of the wellhead gate.

[0022] The pressure sensor 9 is used to detect the pressure in the lubricant preventer 8 .

Claims

1. A semi-automatic gate changing method under pressure without snubbing, characterized in that: A semi-automatic gate changing device under pressure without well snubbing is provided, the device comprising: a screw motor (1), a screw (2), a blowout prevention sleeve (3), a first O-ring (4), a second O-ring (5), a bearing seat (6), a thrust bearing (7), a blowout prevention pipe (8), a pressure sensor (9), a nut push rod (10), a sealing plug (11), a plug setting assembly (12), a plug assembly (13), a third O-ring (14), and a first flange (15); The upper end of the lead screw (2) is connected to the lead screw motor (1), the blowout prevention sleeve (3) is sleeved on the upper end of the blowout prevention pipe (8), the upper section of the lead screw (2) is a polished rod, the lower section of the lead screw (2) is a screw that passes through the blowout prevention sleeve (3), three first O-rings (4) are used to seal between the lead screw (2) of the polished rod section and the blowout prevention sleeve (3), a thrust bearing (7) is provided between the lead screw (2) of the polished rod section below the first O-ring (4) and the blowout prevention sleeve (3) via a bearing seat (6), and a pressure sensor (9) is provided on the blowout prevention pipe (8) below the thrust bearing (7); The inner wall of the tube (8) is provided with a vertical slide groove (19), the outer wall of the nut push rod (10) is provided with a guide block (20), the center of the nut push rod (10) is provided with a threaded hole, the nut push rod (10) is inserted into the blowout preventer (8), the guide block (20) of the nut push rod (10) is located in the vertical slide groove (19) of the blowout preventer (8), and the nut push rod (10) is restricted to move only up and down; the lead screw (2) of the screw section passes through the nut push rod (10) and is threadedly connected with the thread of the nut push rod (10), and the rotation of the lead screw (2) can drive the nut push rod (10) to move up and down; The lower end of the nut push rod (10) is threadedly connected to the plugging device sealing assembly (12), and a sealing plug (11) is provided at the top of the plugging device sealing assembly (12); the lower end of the plugging device sealing assembly (12) is connected to the plugging device assembly (13) through an electromagnetic suction cup; the bottom end of the blowout preventer (8) is sleeved with a first flange (15); the connection between the inside of the blowout preventer (8) and the first flange (15) is sealed with a third O-ring (14); the first flange (15) is connected to the flange of the wellhead gate (16); the wellhead spool (18) is connected to the wellhead gate (16) through a second flange (17); the screw motor (1) and the electromagnetic suction cup are connected to an external power supply through a wire; The working process is as follows: the wellhead gate (16) is closed, the first flange (15) is connected to the flange of the wellhead gate (16), the screw motor (1) drives the screw (2) to rotate, the screw (2) rotates to drive the nut push rod (10) to move downward, the nut push rod (10) drives the plugging device sealing assembly (12) to move downward, the plugging device sealing assembly (12) drives the plugging device assembly (13) to move downward, the plugging device assembly (13) enters the wellhead spool (18) below, and is closed. The through hole is blocked, and then the connection between the first flange (15) and the flange of the wellhead gate (16) is released, and only the plugging device setting assembly (12) and the plugging device assembly (13) are retained. The other components are removed, and then the wellhead gate (16) is removed from the wellhead spool (18) and replaced with a new wellhead gate (16). At this time, the new wellhead gate (16) is in an open state, and then the first flange (15) is connected to the flange of the new wellhead gate (16); Afterwards, the electromagnetic suction cup is energized to generate suction force, which attracts the plug assembly (13) and the plug setting assembly (12) together, and the screw motor (1) drives the screw (2) to rotate. The rotation of the screw (2) drives the nut push rod (10) to move upward, and the plug assembly (13) is pulled out of the wellhead spool (18). After the plug assembly (13) is lifted over the new wellhead gate (16), the new wellhead gate (16) is closed, and the components above the first flange (15) are removed, thereby completing the replacement of the wellhead gate. The pressure sensor (9) is used to detect the pressure in the lubricant preventer (8).

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