CN118669085B - Sealing blowout preventer for thickened oil thermal recovery wellhead - Google Patents

Abstract

The invention provides a thick oil thermal recovery wellhead sealing and blowout prevention device, which relates to the technical field of wellhead blowout preventers, and comprises: a sealing and blowout prevention seat, a clamping unit, a sealing and blowout prevention unit and a multifunctional unit; rectangular guide blocks are welded on the front and rear sides of the sealing and blowout prevention seat; the clamping unit is installed on the sealing and blowout prevention seat; the sealing and blowout prevention unit is installed on the sealing and blowout prevention seat; the multifunctional unit is installed on the top of the sealing and blowout prevention seat; the hydraulic cylinder D is fixedly installed on a movable frame, and the output shaft of the hydraulic cylinder D is fixedly connected to the sealing and blowout prevention seat; the shear gate on the left side of the invention is inserted into the shearing position of the drill pipe, so as to avoid the oil in the wellhead from spraying out through the gap between the two shear gates; and the problem that the two shear gates are generally located at the center of the drill pipe after shearing the drill pipe, and when the shear gate is damaged during the shearing process, the oil in the wellhead is likely to continue to spray out from the gap between the two shear gates, resulting in poor sealing effect is solved.

Description

A thick oil thermal recovery wellhead sealing and blowout prevention device

Technical Field

The invention belongs to the technical field of wellhead blowout preventers, and more specifically, particularly relates to a heavy oil thermal recovery wellhead sealing blowout preventer.

Background Art

The gate blowout preventer is the most important well control equipment in the drilling and completion process of heavy oil thermal recovery. The main features of the gate blowout preventer are: first, the gate has strong sealing ability and high reliability, is resistant to high pressure, and can remain closed for a long time to seal the wellhead; second, the blowout preventer can be equipped with gates for closing drill pipes, casings, and oil pipes of various specifications and types, and can also be equipped with full-sealed gates for closing empty wells, and shear gates for shearing drill pipes in emergency situations.

The blowout preventers currently in use still have the following problems: 1. When the blowout preventer fails to work in time, the oil in the wellhead is likely to spray into the air. Furthermore, it cannot serve as a warning to the scene of the oil spray accident, which makes it easy for unrelated personnel to approach the area around the accident, posing a safety hazard; 2. After the two shear gates cut off the drill pipe, they are generally located in the center of the drill pipe. When the shear gates are damaged during the cutting process, the oil in the wellhead is likely to continue to spray out from the gap between the two shear gates, resulting in poor sealing effect; 3. The displacement generated during the cutting of the drill pipe is likely to damage the rubber sealing ring on the semi-sealed gate, affecting the sealing effect.

Summary of the invention

The disclosed embodiment relates to a heavy oil thermal recovery wellhead sealing and blowout prevention device, which comprises a clamping unit, a sealing and blowout prevention unit and a multifunctional unit; two rubber sealing pads are automatically moved following a drill pipe, thereby avoiding damage to the two rubber sealing pads when the drill pipe is displaced; the shear gate on the left is inserted into the shear position of the drill pipe, thereby avoiding oil in the wellhead from spraying out through the gap between the two shear gates; the device serves as a warning to personnel around the oil-spraying wellhead, thereby avoiding irrelevant personnel from approaching the area around the accident, thereby reducing safety hazards.

In a first aspect of the present disclosure, a sealing and blowout prevention device for a heavy oil thermal recovery wellhead is provided, comprising a sealing and blowout prevention seat, a clamping unit, a sealing and blowout prevention unit and a multifunctional unit;

Rectangular guide blocks are welded on the front and rear sides of the sealing blowout preventer; the clamping unit is installed on the sealing blowout preventer, and the clamping unit is used to clamp the drill rod to be sheared; the sealing blowout preventer unit is installed on the sealing blowout preventer, and the sealing blowout preventer unit is used to shear the drill rod;

The multifunctional unit is installed on the top of the sealing blowout preventer. The multifunctional unit is used to block the sprayed oil and is also used to warn nearby operating workers.

In at least some embodiments, the clamping unit includes: a U-shaped mounting frame, a hydraulic cylinder A and a clamping seat; there are two U-shaped mounting frames, and the two U-shaped mounting frames are respectively welded on the left and right sides of the sealing blowout preventer seat; there are two hydraulic cylinders A, and the two hydraulic cylinders A are respectively fixedly mounted on the two U-shaped mounting frames; there are two clamping seats, and the two clamping seats are slidably mounted inside the sealing blowout preventer seat, and the outer sides of the two clamping seats are fixedly connected to the output shafts of the two hydraulic cylinders A.

In at least some embodiments, the clamping unit further includes: a rubber sealing ring A, a circular mounting rod and a movable clamping block; the rubber sealing ring A is provided in two groups, and the two groups of rubber sealing rings A are installed on the outside of the two clamping seats, and the number of rubber sealing rings A in each group is two; the circular mounting rod is provided in two groups, and the two groups of circular mounting rods are welded to the two clamping seats, and the number of circular mounting rods in each group is two; the movable clamping blocks are provided in two groups, and the two movable clamping blocks are slidably installed on the outside of the two groups of circular mounting rods.

In at least some embodiments, the clamping unit further includes: a return spring A and a rubber sealing pad; the return spring A is provided in two groups, and the two groups of return springs A are installed on the outside of two groups of circular mounting rods, and the two groups of return springs A are located below two movable clamping blocks; the rubber sealing pad is provided in two groups, and the two rubber sealing pads are fixedly installed on the two movable clamping blocks.

In at least some embodiments, the sealing blowout preventer unit includes: a movable frame, a hydraulic cylinder B, a hydraulic cylinder C and a shear gate; the movable frame is slidably mounted on the outside of the sealing blowout preventer seat, and two rectangular guide blocks are inserted into two slots on the movable frame; the hydraulic cylinder B is fixedly mounted on the movable frame; the hydraulic cylinder C is fixedly mounted on the movable frame; there are two shear gates in total, and the two shear gates are slidably mounted inside the sealing blowout preventer seat, and the outer sides of the two shear gates are fixedly connected to the output shafts of the hydraulic cylinder B and the hydraulic cylinder C.

In at least some embodiments, the sealing blowout prevention unit also includes: a rubber sealing ring B, a hydraulic cylinder D and a linkage push frame; the rubber sealing ring B is provided in two groups, and the two groups of rubber sealing rings B are installed on the outside of the two shear gates, and the number of rubber sealing rings B in each group is four; the hydraulic cylinder D is fixedly installed on the movable frame, and the output shaft of the hydraulic cylinder D is fixedly connected to the sealing blowout prevention seat; the linkage push frame is welded to the rear side of the movable frame.

In at least some embodiments, the multifunctional unit includes: a guide mounting frame, a rectangular sliding block and a circular guide shaft; there are two guide mounting frames, and the two guide mounting frames are installed on the top of the sealing blowout preventer by screws; there are two groups of rectangular sliding blocks, and the two groups of rectangular sliding blocks are slidably installed on the outside of the two guide mounting frames, and the number of rectangular sliding blocks in each group is two; there are two groups of circular guide shafts, and the two groups of circular guide shafts are slidably installed on the two groups of rectangular sliding blocks, and the number of circular guide shafts in each group is four.

In at least some embodiments, the multifunctional unit further includes: a mounting plate, a linkage push rod, a multifunctional cover and a return spring B; there are two mounting plates in total, and the two mounting plates are welded on two groups of circular guide shafts, and a linkage push rod is arranged on the rear side of the two mounting plates; there are two multifunctional covers in total, and the two multifunctional covers are welded on the inner sides of the two mounting plates, and the inner sides of the two multifunctional covers are in contact; there are two groups of return springs B in total, and the two groups of return springs B are installed on the outside of the two groups of circular guide shafts.

In at least some embodiments, the multifunctional unit further includes: a U-shaped handle, a mounting bracket, an alarm and a limit clamp ring; there are two U-shaped handles, and the two U-shaped handles are welded to the outside of the two mounting plates; there are two mounting brackets, and the two mounting brackets are welded to the two guide mounting frames; there are two alarms, and the two alarms are fixedly mounted on the two mounting brackets; there are two groups of limit clamp rings, and the two groups of limit clamp rings are welded to the two guide mounting frames; the tops of the two groups of limit clamp rings are in contact with the two groups of rectangular sliding blocks, and the number of limit clamp rings in each group is two.

In at least some embodiments, the multifunctional unit further includes: a limit card plate, a circular positioning rod and a switch; there are two limit card plates in total, and the two limit card plates are welded to two guide mounting frames, and positioning circular holes are respectively provided on the two limit card plates; there are two circular positioning rods in total, and the two circular positioning rods are welded to the tops of the two mounting plates; the tops of the two circular positioning rods are provided with chamfers, and the two circular positioning rods are concentrically arranged with the two positioning circular holes; there are two switches in total, and the two switches are fixedly mounted on the two limit card plates, and the two switches are electrically connected to the two alarms, and the two alarms work when the two switches are in a pressed state.

Compared with the prior art, the present invention has the following beneficial effects:

1. In the present invention, when the output shafts of the two hydraulic cylinders A extend, the two clamping seats are pushed to move toward each other; when the drill pipe is displaced during shearing, the sheared drill pipe drives the two movable clamping blocks to move downward, so that the two groups of return springs A are compressed, and the two rubber sealing pads are automatically moved with the drill pipe, thereby avoiding damage to the two rubber sealing pads when the drill pipe is displaced, and improving the sealing effect of the wellhead.

2. In the present invention, when the output shafts of hydraulic cylinder B and hydraulic cylinder C extend, the two shear gates automatically move inward, thereby realizing automatic shearing of the drill pipe; when the output shaft of hydraulic cylinder D contracts, the movable frame moves to the right, and when the movable frame moves to the right, it can drive the two shear gates to move to the right. After the two shear gates move to the right, the shear gate on the left is inserted into the shearing position of the drill pipe, thereby preventing the oil in the wellhead from spraying out through the gap between the two shear gates, thereby improving the sealing effect of the wellhead.

3. The present invention has a blocking effect on the oil sprayed from the wellhead, preventing the oil in the wellhead from spraying upward. When the two multifunctional covers move upward under the thrust of the oil spray, the two circular positioning rods can be inserted into the two positioning circular holes, which has a limiting effect on the two multifunctional covers, avoiding the formation of gaps on the inner sides of the two multifunctional covers, and improving the blocking effect of the oil after spraying;

In addition, when the two mounting plates press the two switches, the two alarms work, making it easy for the operating workers to know that the oil in the wellhead is spraying out at the first time. When the hydraulic cylinder D drives the movable frame to move, the linkage push frame automatically pushes the two linkage push rods to move upward, so that the two mounting plates continue to press the two switches, ensuring that the two alarms are always in the alarm state, which serves as a warning to the personnel around the oil spraying wellhead, avoids irrelevant personnel from approaching the area around the accident, and reduces safety hazards.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

The drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

In the attached picture:

FIG. 1 is a schematic diagram of the three-dimensional structure of the present invention.

FIG. 2 is a schematic diagram of the central cutaway structure of FIG. 1 of the present invention.

FIG. 3 is a schematic structural diagram of a clamping unit of the present invention.

FIG. 4 is a schematic diagram of a partially enlarged structure of area A in FIG. 2 of the present invention.

FIG. 5 is a schematic structural diagram of the sealing blowout prevention unit of the present invention.

FIG. 6 is a schematic diagram of a partially enlarged structure of area B in FIG. 2 of the present invention.

FIG. 7 is a schematic diagram of the structure of the multifunctional unit of the present invention.

FIG8 is a schematic diagram of a partially enlarged structure of area C in FIG7 of the present invention.

FIG. 9 is a schematic diagram of the rear side structural view of FIG. 1 of the present invention.

FIG. 10 is a schematic diagram of a partially enlarged structure of the D area in FIG. 9 of the present invention.

11 is a schematic diagram of the central section structure of the sealing blowout preventer seat and the sealing blowout preventer unit after shearing of the present invention.

FIG. 12 is a schematic diagram of a partially enlarged structure of the E region in FIG. 2 of the present invention.

List of reference numerals:

1. Sealing blowout preventer; 101. Rectangular guide block;

2. Clamping unit; 201. U-shaped mounting frame; 202. Hydraulic cylinder A; 203. Clamping seat; 204. Rubber sealing ring A; 205. Round mounting rod; 206. Movable clamping block; 207. Return spring A; 208. Rubber sealing pad;

3. Sealing blowout prevention unit; 301. Movable frame; 302. Hydraulic cylinder B; 303. Hydraulic cylinder C; 304. Shear gate; 305. Rubber sealing ring B; 306. Hydraulic cylinder D; 307. Linkage push frame;

4. Multifunctional unit; 401. Guide mounting frame; 402. Rectangular sliding block; 403. Circular guide shaft; 404. Mounting plate; 4041. Linkage push rod; 405. Multifunctional cover; 406. Return spring B; 407. U-shaped handle; 408. Mounting bracket; 409. Alarm; 410. Limiting clamp ring; 411. Limiting clamp plate; 4111. Positioning circular hole; 412. Circular positioning rod; 413. Switch.

DETAILED DESCRIPTION

In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

Embodiment 1: Please refer to FIG. 1 to FIG. 6 : The present invention provides a thick oil thermal recovery wellhead sealing blowout prevention device, comprising a sealing blowout prevention seat 1, a clamping unit 2, a sealing blowout prevention unit 3 and a multifunctional unit 4;

Rectangular guide blocks 101 are welded on the front and rear sides of the sealing blowout preventer 1; the clamping unit 2 is installed on the sealing blowout preventer 1, and the clamping unit 2 is used to clamp the drill pipe to be sheared; the sealing blowout preventer unit 3 is installed on the sealing blowout preventer 1, and the sealing blowout preventer unit 3 is used to shear the drill pipe;

The multifunctional unit 4 is installed on the top of the sealing blowout preventer 1. The multifunctional unit 4 is used to block the sprayed oil and also to warn nearby operators.

In the embodiment of the present disclosure, as shown in Figures 1, 3 and 4, the clamping unit 2 includes: a U-shaped mounting frame 201, a hydraulic cylinder A202 and a clamping seat 203; there are two U-shaped mounting frames 201, and the two U-shaped mounting frames 201 are respectively welded on the left and right sides of the sealing blowout preventer 1; there are two hydraulic cylinders A202, and the two hydraulic cylinders A202 are respectively fixedly mounted on the two U-shaped mounting frames 201; there are two clamping seats 203, and the two clamping seats 203 are slidably mounted inside the sealing blowout preventer 1, and the outer sides of the two clamping seats 203 are fixedly connected to the output shafts of the two hydraulic cylinders A202; the clamping unit 2 also includes: a rubber sealing ring A204, a circular mounting rod 205 and a movable clamping block 206; there are two groups of rubber sealing rings A204, and the two groups of rubber sealing rings A204 are mounted The outside of the two clamping seats 203, and the number of each group of rubber sealing rings A204 is two; there are two groups of circular mounting rods 205, and the two groups of circular mounting rods 205 are welded on the two clamping seats 203, and the number of each group of circular mounting rods 205 is two; there are two movable clamping blocks 206, and the two movable clamping blocks 206 are slidably installed on the outside of the two groups of circular mounting rods 205; the clamping unit 2 also includes: a reset spring A207 and a rubber sealing pad 208; there are two groups of reset springs A207, and the two groups of reset springs A207 are installed on the outside of the two groups of circular mounting rods 205, and the two groups of reset springs A207 are located below the two movable clamping blocks 206; there are two rubber sealing pads 208, and the two rubber sealing pads 208 are fixedly installed on the two movable clamping blocks 206;

Among them, the drill rod is located inside the sealing blowout preventer seat 1, and the drill rod is also located between two movable clamping blocks 206 and two shear gates 304. The two movable clamping blocks 206 are used to fix the sheared drill rod to prevent the sheared drill rod from falling. The two shear gates 304 are used to shear the drill rod to achieve sealing and blowout prevention.

Its specific function is as follows: because the two clamping seats 203 are slidably installed inside the sealing blowout preventer seat 1, and the outer sides of the two clamping seats 203 are fixedly connected to the output shafts of the two hydraulic cylinders A202, when the output shafts of the two hydraulic cylinders A202 are extended, the two clamping seats 203 are pushed to move toward each other, and because the two movable clamping blocks 206 are slidably installed on the outside of the two groups of circular mounting rods 205, and the two groups of return springs A207 are installed on the outside of the two groups of circular mounting rods 205, and the two groups of return springs A207 are located below the two movable clamping blocks 206, when the drill pipe is displaced due to the thickness of the shear gate 304 during shearing, the sheared drill pipe drives the two movable clamping blocks 206 to move downward, causing the two groups of return springs A207 to be compressed, thereby realizing the automatic movement of the two rubber sealing pads 208 following the drill pipe, avoiding damage to the two rubber sealing pads 208 when the drill pipe is displaced, and improving the sealing effect of the wellhead.

In the embodiment of the present disclosure, as shown in Figures 1, 5 and 6, the sealing blowout prevention unit 3 includes: a movable frame 301, a hydraulic cylinder B302, a hydraulic cylinder C303 and a shear gate 304; the movable frame 301 is slidably mounted on the outside of the sealing blowout prevention seat 1, and two rectangular guide blocks 101 are inserted into two slots on the movable frame 301; the hydraulic cylinder B302 is fixedly mounted on the movable frame 301; the hydraulic cylinder C303 is fixedly mounted on the movable frame 301; there are two shear gates 304, and the two shear gates 304 are slidably mounted on the inside of the sealing blowout prevention seat 1 ... The outer side of the gate 304 is fixedly connected to the output shafts of the hydraulic cylinder B302 and the hydraulic cylinder C303; the sealing blowout prevention unit 3 also includes: a rubber sealing ring B305, a hydraulic cylinder D306 and a linkage push frame 307; there are two groups of rubber sealing rings B305, and the two groups of rubber sealing rings B305 are installed on the outside of the two shear gates 304, and the number of rubber sealing rings B305 in each group is four; the hydraulic cylinder D306 is fixedly installed on the movable frame 301, and the output shaft of the hydraulic cylinder D306 is fixedly connected to the sealing blowout prevention seat 1; the linkage push frame 307 is welded to the rear side of the movable frame 301;

Its specific function is as follows: because the two shear gates 304 are slidably installed inside the sealing blowout preventer seat 1, and the outer sides of the two shear gates 304 are fixedly connected to the output shafts of the hydraulic cylinders B302 and C303, when the output shafts of the hydraulic cylinders B302 and C303 are extended, the two shear gates 304 automatically move inwards, thereby realizing automatic shearing of the drill pipe; and because the hydraulic cylinder D306 is fixedly installed on the movable frame 301, and the output shaft of the hydraulic cylinder D306 is fixedly connected to the sealing blowout preventer seat 1, when the output shaft of the hydraulic cylinder D306 is contracted, the movable frame 301 moves rightward, and when the movable frame 301 moves rightward, it can drive the two shear gates 304 to move rightward. After the two shear gates 304 move rightward, the shear gate 304 on the left is inserted into the shearing position of the drill pipe (refer to FIG. 11), thereby preventing the oil in the wellhead from spraying out through the gap between the two shear gates 304, thereby improving the sealing effect of the wellhead.

Embodiment 2: As shown in FIGS. 7 to 12 , a multifunctional unit 4 is added on the basis of Embodiment 1, and the multifunctional unit 4 includes: a guide mounting frame 401, a rectangular sliding block 402 and a circular guide shaft 403; there are two guide mounting frames 401, and the two guide mounting frames 401 are mounted on the top of the sealing blowout preventer 1 by screws; there are two groups of rectangular sliding blocks 402, and the two groups of rectangular sliding blocks 402 are slidably mounted on the outside of the two guide mounting frames 401, and the number of each group of rectangular sliding blocks 402 is two; there are two groups of circular guide shafts 403, and the two groups of circular guide shafts 403 are slidably mounted on the two groups of rectangular sliding blocks 402, and the number of each group of circular guide shafts 403 is four; The functional unit 4 also includes: a mounting plate 404, a linkage push rod 4041, a multifunctional cover 405 and a reset spring B406; there are two mounting plates 404, and the two mounting plates 404 are welded on the two sets of circular guide shafts 403, and the rear sides of the two mounting plates 404 are provided with a linkage push rod 4041; there are two multifunctional covers 405, and the two multifunctional covers 405 are welded on the inner sides of the two mounting plates 404, and the inner sides of the two multifunctional covers 405 are in contact; there are two sets of reset springs B406, and the two sets of reset springs B406 are installed on the outside of the two sets of circular guide shafts 403; the multifunctional unit 4 also includes: a U-shaped handle 407, a mounting bracket 408, an alarm 40 9 and a limit collar 410; two U-shaped handles 407 are provided, and the two U-shaped handles 407 are welded to the outside of the two mounting plates 404; two mounting brackets 408 are provided, and the two mounting brackets 408 are welded to the two guide mounting frames 401; two alarms 409 are provided, and the two alarms 409 are fixedly installed on the two mounting brackets 408; two groups of limit collars 410 are provided, and the two groups of limit collars 410 are welded to the two guide mounting frames 401; the tops of the two groups of limit collars 410 are in contact with the two groups of rectangular sliding blocks 402, and the number of each group of limit collars 410 is two; the multifunctional unit 4 also includes: a limit plate 411, a circular positioning rod 412 and a switch 41 3; There are two limit card plates 411, which are welded to the two guide mounting frames 401, and the two limit card plates 411 are respectively provided with positioning circular holes 4111; There are two circular positioning rods 412, which are welded to the tops of the two mounting plates 404; The tops of the two circular positioning rods 412 are provided with chamfers, and the two circular positioning rods 412 are concentrically arranged with the two positioning circular holes 4111; There are two switches 413, which are fixedly mounted on the two limit card plates 411, and the two switches 413 are electrically connected to the two alarms 409, and the two alarms 409 work when the two switches 413 are in a pressed state;

The specific function is as follows: because the two multifunctional covers 405 are welded to the inner sides of the two mounting plates 404, and the inner sides of the two multifunctional covers 405 are in contact, the oil sprayed out of the wellhead is blocked, and the oil in the wellhead is prevented from spraying upward. In addition, because the two limiting clamping plates 411 are respectively provided with positioning holes 4111, and two circular positioning rods 412 are welded to the tops of the two mounting plates 404, and the two circular positioning rods 412 are concentrically arranged with the two positioning holes 4111, when the two multifunctional covers 405 move upward under the thrust of the oil injection, the two circular positioning rods 412 can be inserted into the two positioning holes 4111, which limits the two multifunctional covers 405, avoids the formation of gaps on the inner sides of the two multifunctional covers 405, and improves the blocking effect of the oil after the injection.

Because the two alarms 409 are fixedly mounted on the two mounting brackets 408, and the two switches 413 are fixedly mounted on the two limit card plates 411, and the two switches 413 are electrically connected to the two alarms 409, when the two mounting plates 404 press the two switches 413, the two alarms 409 work, which is convenient for the operating workers to know that the oil in the wellhead is sprayed out at the first time. In addition, because the rear sides of the two mounting plates 404 are provided with linkage push rods 4041, and the linkage push frame 307 is welded to the rear side of the movable frame 301, when the hydraulic cylinder D306 drives the movable frame 301 to move, the linkage push frame 307 automatically pushes the two linkage push rods 4041 to move upward, so that the two mounting plates 404 continue to press the two switches 413, ensuring that the two alarms 409 are always in an alarm state, which serves as a warning to the personnel around the oil spraying wellhead, avoids irrelevant personnel from approaching the area around the accident, and reduces safety hazards.

The specific usage and function of this embodiment are as follows:

When the present invention is used, the staff first connects the sealing blowout preventer 1 tightly with the wellhead casing, then pulls the two U-shaped handles 407 outward to separate the two multifunctional covers 405, then places the external equipment parts between the two multifunctional covers 405, and then connects the external equipment parts tightly with the top of the sealing blowout preventer 1. When oil spray occurs at the wellhead, the two multifunctional covers 405 block the oil sprayed from the wellhead, preventing the oil in the wellhead from spraying upward. When the two multifunctional covers 405 move upward under the thrust of the oil spray, the two circular positioning rods 412 can be inserted into the two positioning circular holes 406. 111, the two multifunctional covers 405 are limited, so that gaps are avoided on the inner sides of the two multifunctional covers 405, and the blocking effect of the oil after the oil is sprayed out is improved; when the two mounting plates 404 press the two switches 413, the two alarms 409 work, so that the operating workers can know the oil spraying out in the wellhead at the first time; then the staff will start the two hydraulic cylinders A202, hydraulic cylinder B302, hydraulic cylinder C303 and hydraulic cylinder D306 at the first time after the oil is sprayed, and when the output shafts of the two hydraulic cylinders A202 extend, the two clamping seats 203 are pushed to move toward each other, and when the hydraulic cylinders B302 and hydraulic cylinders D306 are pressed, the two clamping seats 203 are pushed to move toward each other. When the output shaft of C303 extends, the two shear gates 304 automatically move inward, realizing automatic shearing of the drill pipe. When the output shaft of the hydraulic cylinder D306 contracts, the movable frame 301 moves to the right. When the movable frame 301 moves to the right, it can drive the two shear gates 304 to move to the right. After the two shear gates 304 move to the right, the shear gate 304 on the left is inserted into the shearing position of the drill pipe, avoiding the oil in the wellhead from spraying out through the gap between the two shear gates 304, thereby improving the sealing effect of the wellhead. When displacement occurs during the shearing process of the drill pipe, the sheared drill pipe drives the two movable clamping blocks 206 downward. When the hydraulic cylinder D306 drives the movable frame 301 to move, the linkage push frame 307 automatically pushes the two linkage push rods 4041 to move upward, so that the two mounting plates 404 continue to press the two switches 413, ensuring that the two alarms 409 are always in an alarm state, which serves as a warning to the personnel around the oil-spouting wellhead, avoids irrelevant personnel from approaching the area around the accident, and reduces safety hazards.

In this article, there are a few points to note:

1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims (4)

1. The sealing blowout preventer for the thick oil thermal recovery wellhead comprises a sealing blowout preventer seat (1), a clamping unit (2), a sealing blowout preventer unit (3) and a multifunctional unit (4);

Rectangular guide blocks (101) are welded on the front side and the rear side of the sealing blowout prevention seat (1); the drilling rod shearing device is characterized in that the clamping unit (2) is arranged on the sealing blowout prevention seat (1), and the clamping unit (2) is used for clamping a drilling rod to be sheared; the sealing blowout prevention unit (3) is arranged on the sealing blowout prevention seat (1), and the sealing blowout prevention unit (3) is used for shearing a drill rod;

the multifunctional unit (4) is arranged at the top of the sealing blowout prevention seat (1), the multifunctional unit (4) is used for blocking the sprayed oil, and the multifunctional unit (4) is also used for warning operators nearby;

The clamping unit (2) comprises: the hydraulic cylinder comprises a U-shaped mounting frame (201), a hydraulic cylinder A (202) and a clamping seat (203); two U-shaped mounting frames (201) are arranged in total, and the two U-shaped mounting frames (201) are respectively welded on the left side and the right side of the sealing blowout prevention seat (1); two hydraulic cylinders A (202) are arranged in total, and the two hydraulic cylinders A (202) are respectively and fixedly arranged on two U-shaped mounting frames (201); the two clamping seats (203) are arranged in total, the two clamping seats (203) are slidably arranged in the sealing blowout prevention seat (1), and the outer sides of the two clamping seats (203) are fixedly connected with the output shafts of the two hydraulic cylinders A (202); the clamping unit (2) further comprises: a circular mounting rod (205), a movable clamping block (206) and a return spring A (207); the two groups of circular mounting rods (205) are arranged in total, the two groups of circular mounting rods (205) are welded on the two clamping seats (203), and the number of each group of circular mounting rods (205) is two; two movable clamping blocks (206) are arranged in total, and the two movable clamping blocks (206) are slidably arranged outside the two groups of circular mounting rods (205); the two groups of reset springs A (207) are arranged in total, the two groups of reset springs A (207) are arranged outside the two groups of circular mounting rods (205), and the two groups of reset springs A (207) are positioned below the two movable clamping blocks (206);

The sealing blowout prevention unit (3) comprises: a movable frame (301), a hydraulic cylinder B (302), a hydraulic cylinder C (303) and a shear ram (304); the movable frame (301) is slidably arranged outside the sealing blowout prevention seat (1), and two rectangular guide blocks (101) are inserted into two slotted holes on the movable frame (301); the hydraulic cylinder B (302) is fixedly arranged on the movable frame (301); the hydraulic cylinder C (303) is fixedly arranged on the movable frame (301); the two shearing flashboards (304) are arranged in the sealing blowout prevention seat (1) in a sliding way, and the outer sides of the two shearing flashboards (304) are fixedly connected with the output shafts of the hydraulic cylinder B (302) and the hydraulic cylinder C (303) respectively; the sealing blowout prevention unit (3) further comprises: a hydraulic cylinder D (306) and a linkage pushing frame (307); the hydraulic cylinder D (306) is fixedly arranged on the movable frame (301), and an output shaft of the hydraulic cylinder D (306) is fixedly connected with the sealing blowout prevention seat (1); the linkage pushing frame (307) is welded at the rear side of the movable frame (301);

The multi-function unit (4) comprises: a guide mounting frame (401), a rectangular sliding block (402) and a circular guide shaft (403); the two guide mounting frames (401) are arranged in total, and the two guide mounting frames (401) are arranged at the top of the sealing blowout prevention seat (1) through screws; the rectangular sliding blocks (402) are provided with two groups in total, the two groups of rectangular sliding blocks (402) are slidably arranged outside the two guide mounting frames (401), and the number of each group of rectangular sliding blocks (402) is two; the circular guide shafts (403) are provided with two groups in total, the two groups of circular guide shafts (403) are slidably arranged on the two groups of rectangular sliding blocks (402), and the number of each group of circular guide shafts (403) is four; the multifunctional unit (4) further comprises: the mounting plate (404), the linkage push rod (4041), the multifunctional cover (405) and the return spring B (406); two mounting plates (404) are arranged in total, the two mounting plates (404) are welded on two groups of circular guide shafts (403), and linkage push rods (4041) are arranged at the rear sides of the two mounting plates (404); the multifunctional covers (405) are arranged in two, the two multifunctional covers (405) are welded on the inner sides of the two mounting plates (404), and the inner sides of the two multifunctional covers (405) are contacted; the two groups of the reset springs B (406) are arranged in total, and the two groups of the reset springs B (406) are arranged outside the two groups of the circular guide shafts (403);

The multifunctional unit (4) further comprises: a mounting bracket (408) and an alarm (409); the two mounting brackets (408) are arranged in total, and the two mounting brackets (408) are welded on the two guide mounting frames (401); the two alarms (409) are arranged in total, and the two alarms (409) are fixedly arranged on the two mounting brackets (408); the multifunctional unit (4) further comprises: the device comprises a limiting clamping plate (411), a circular positioning rod (412) and a switch (413); two limit clamping plates (411) are arranged in total, the two limit clamping plates (411) are welded on the two guide mounting frames (401), and positioning round holes (4111) are respectively formed in the two limit clamping plates (411); two circular positioning rods (412) are arranged in total, and the two circular positioning rods (412) are welded at the tops of the two mounting plates (404); the tops of the two circular positioning rods (412) are provided with chamfers, and the two circular positioning rods (412) and the two positioning round holes (4111) are concentrically arranged; the two switches (413) are arranged in total, the two switches (413) are fixedly arranged on the two limiting clamping plates (411), the two switches (413) are electrically connected with the two alarms (409), and when the two switches (413) are in a pressing state, the two alarms (409) work.

2. A heavy oil thermal recovery wellhead sealing blowout preventer according to claim 1, wherein the clamping unit (2) further comprises: a rubber seal ring A (204) and a rubber seal pad (208); two groups of rubber sealing rings A (204) are arranged in total, the two groups of rubber sealing rings A (204) are arranged outside the two clamping seats (203), and the number of the rubber sealing rings A (204) in each group is two; two rubber gaskets (208) are arranged in total, and the two rubber gaskets (208) are fixedly arranged on the two movable clamping blocks (206).

3. A heavy oil thermal recovery wellhead sealing blowout preventer according to claim 1, wherein the sealing blowout preventer unit (3) further comprises: rubber seal ring B (305); two groups of rubber sealing rings B (305) are arranged in total, the two groups of rubber sealing rings B (305) are arranged outside the two shearing flashboards (304), and the number of the rubber sealing rings B (305) in each group is four.

4. A heavy oil thermal recovery wellhead sealing blowout preventer according to claim 1, wherein the multi-functional unit (4) further comprises: a U-shaped handle (407) and a limit collar (410); two U-shaped handles (407) are arranged in total, and the two U-shaped handles (407) are welded on the outer sides of the two mounting plates (404); the limiting clamping rings (410) are provided with two groups in total, and the two groups of limiting clamping rings (410) are welded on the two guide mounting frames (401); the top of the two sets of stop collars (410) are in contact with the two sets of rectangular sliders (402), and the number of stop collars (410) in each set is two.