Blowout preventer of sucker rod

Abstract

The utility model belongs to the technical field of blowout preventers, and particularly relates to a sucker rod blowout preventer, which comprises a base mounted at the top of a wellhead, and a pressure regulating port is formed in the middle of the base in a penetrating manner; the plugging block is arranged in an annular space between the oil pipe and the shaft, slidably abuts against the oil pipe and is used for plugging the pressure regulating opening when oil gas leaks; the suspender is used for suspending the plugging block; the first magnetic ring is fixedly connected to one end, away from the plugging block, of the suspender; when oil gas leaks, the plugging block is pushed to slide towards the side close to a well mouth along an annular space between a shaft and an oil pipe, the distance between the plugging block and a pressure adjusting opening is shortened, the distance between the first magnetic ring and the second magnetic ring is shortened, and the oil gas leakage is avoided. Therefore, the first magnetic ring and the second magnetic ring are in magnetic attraction connection, the plugging block automatically plugs the pressure regulating port, oil and gas leakage is avoided, and the problem that the flashboard cannot be pushed in time to plug the annular space when a sensor fails in the prior art is prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of blowout preventer, concretely relates to an oil pumping rod blowout preventer. BACKGROUND

[0002] In the oil exploitation industry, the oil pumping rod blowout preventer is the key equipment to ensure the safety of oil well operation. The traditional oil pumping rod blowout preventer usually adopts a hydraulic device or a mechanical structure such as a screw rod to drive the gate seal to seal the annular space between the wellbore and the oil pipe, thereby preventing the blowout accident. When the oil pumping rod is normally lifted or lowered, the gate is in an open state, allowing the oil pumping rod to pass freely. When the well pressure is suddenly increased, the gate is clamped to the oil pumping rod body by rotating the screw or starting the hydraulic device, thereby sealing the annular space and achieving the sealing state.

[0003] However, the existing oil pumping rod blowout preventer has many defects in the use process. First, the hydraulic blowout preventer is easily affected by temperature, humidity, dust and other factors in harsh operating environments, resulting in performance degradation or damage of hydraulic components. For example, in a low-temperature environment, the viscosity of hydraulic oil increases, the blowout preventer moves slowly or even cannot work normally; in a high-temperature environment, the hydraulic components may overheat and expand, which seriously affects the sealing performance and service life of the blowout preventer.

[0004] In addition, the existing blowout preventer usually relies on a pressure sensor to monitor the wellhead pressure in real time. However, harsh environmental conditions can also affect the performance of the pressure sensor, resulting in increased measurement error and inability to accurately monitor the pressure change in the well, which makes the workers unable to timely know the abnormal pressure condition in the well, thereby possibly missing the best response opportunity and posing a threat to the safety of workers and equipment. UTILITY MODEL CONTENTS

[0005] In view of the above problems, the utility model aims to provide an oil pumping rod blowout preventer to solve the problems raised in the background.

[0006] The utility model provides an oil pumping rod blowout preventer, which comprises a base, a pressure regulating port is formed in the middle part of the base installed at the top of the wellhead; a blocking block is arranged in the annular space between the oil pipe and the wellbore and is in sliding contact with the oil pipe, and is used for blocking the pressure regulating port when oil and gas leak; a suspender is used for suspending the blocking block and is in sliding connection with the base; a first magnetic ring is fixedly connected to one end of the suspender away from the blocking block; a second magnetic ring is installed on the protective cover at the top of the base, and the first magnetic ring and the second magnetic ring are magnetically connected when the blocking block blocks the pressure regulating port.

[0007] Preferably, the blocking block is integrally formed with a baffle on the side away from the oil pipe, the baffle is in sliding contact with the inner wall of the wellbore, and a plurality of pressure regulating holes are uniformly formed in the baffle.

[0008] Preferably, the blocking block comprises a counterweight part for counteracting the magnetic force between the first magnetic ring and the second magnetic ring and maintaining the structural stability of the blocking block, and a sealing part wrapped outside the counterweight part for increasing the sealing between the blocking block and the pressure regulating port.

[0009] Preferably, the protective cover is movably connected with the base for adjusting the distance between the first magnetic ring and the second magnetic ring.

[0010] Preferably, the shape of the blocking block includes but is not limited to a stepped shape, a boss shape, etc., and the pressure regulating port is matched with the blocking block.

[0011] Preferably, the end of the blocking block away from the wellhead is fixedly connected with an extension boss.

[0012] The beneficial effects of the utility model are as follows: through the setting of the base, the blocking block in sliding connection with the base, the first magnetic ring and the second magnetic ring, etc., when oil and gas leak, the blocking block is pushed to slide to the side close to the wellhead along the annular space between the wellbore and the oil pipe, the distance between the blocking block and the pressure regulating port is shortened, the distance between the first magnetic ring and the second magnetic ring is shortened, so that the first magnetic ring and the second magnetic ring are magnetically connected, the blocking of the blocking block to the pressure regulating port is realized, oil and gas leakage is avoided, and the problem that the sensor in the prior art cannot timely push the gate plate to block the annular space when the sensor malfunctions is solved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the planar structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the sectional structure of the utility model;

[0015] Figure 3 It is a schematic diagram of the structure of the utility model in use;

[0016] Figure 4 It is a schematic diagram of the sectional structure of the utility model in use.

[0017] In the drawing: 1, base; 2, pressure regulating port; 3, blocking block; 4, oil pipe; 5, wellbore; 6, annular space; 7, suspender; 8, first magnetic ring; 9, second magnetic ring; 10, baffle; 11, pressure regulating hole; 12, counterweight part; 13, sealing part; 14, protective cover; 15, extension boss; 16, fastening bolt; 17, mounting bolt; 18, adjusting hole. DETAILED DESCRIPTION

[0018] In order to make the skilled in the art better understand the technical scheme of the utility model, the utility model is described in detail below in combination with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model.

[0019] The utility model discloses current sucker rod blowout preventer, it mainly includes casing, gate, drive gate seal well cylinder 5 with the hydraulic device or screw rod etc. (not drawn in the drawing) between annular space 6 of oil pipe 4, when using, the casing is installed fixed with well cylinder 5 through fastening bolt 16, when normally lifting, the gate is in the open state, allows the free passage of sucker rod, installs pressure sensor at wellhead or in well, real -time monitoring wellhead pressure, if the pressure in well is monitored and suddenly rises, and continuously rises, possibly is the sign that oil and gas will soon spray, pressure sensor will be monitored pressure signal transmission to controller, and controller sends out the alarm and reminds staff, and staff moves the gate to the side close to sucker rod through rotating screw or starting hydraulic device, and holds tightly the sucker rod body, and blocks well cylinder 5 with annular space 6 between oil pipe 4, reaches sealing state, thereby prevents the occurrence of blowout, the above is the introduction of current sucker rod blowout preventer.

[0020] From the above, the existing sucker rod blowout preventer has the following defects when in use, that is, the hydraulic blowout preventer may be affected by temperature, humidity, dust and other factors in harsh working environment, resulting in performance degradation or damage of hydraulic components. For example, in low temperature environment, the viscosity of hydraulic oil will increase, resulting in slow action or failure of the blowout preventer; in high temperature environment, the hydraulic components may overheat, expand and other problems, affecting the sealing performance and service life of the blowout preventer, and the harsh environment will also affect the performance of the pressure sensor, resulting in increased measurement error, unable to accurately monitor the pressure in the well, so that the worker cannot know the pressure change in the well in time, which will cause harm to the worker. Based on the above problems, the utility model uses the following improvement mode to solve them.

[0021] As Figures 1-4As shown, the blowout preventer for sucker rod is different from the prior art, which mainly comprises a base 1 installed at the top of the wellbore 5 through fastening bolts 16 and having a pressure regulating port 2 penetratingly arranged in the middle thereof, a blocking block 3 arranged in the annular space 6 between the oil pipe 4 and the wellbore 5 and slidingly abutting against the oil pipe 4, a hanger rod 7 slidingly connected with the base 1 and used for suspending the blocking block 3, a first magnetic ring 8 fixedly connected with the end of the hanger rod 7 away from the blocking block 3, and a second magnetic ring 9 arranged on the protective cover 14 at the top of the base 1, in the initial state, the blocking block 3 is suspended in the annular space 6 between the oil pipe 4 and the wellbore 5, and the inner side of the blocking block 3 is attached to the oil pipe 4, the outer side of the blocking block 3 slidingly abuts against the inner wall of the wellbore 5 through a baffle 10, and the outer surface of the baffle 10 is provided with a wear-resistant coating for reducing the friction loss between the baffle and the inner wall of the wellbore 5, a plurality of pressure regulating holes 11 are uniformly arranged on the baffle 10 and are in communication with the atmosphere outside through the pressure regulating port 2, for balancing the pressure in the well, the distance from the upper surface of the blocking block 3 to the pressure regulating port 2 is equal to the distance between the first magnetic ring 8 and the second magnetic ring 9, and is equal to the effective magnetic attraction distance between the first magnetic ring 8 and the second magnetic ring 9, however, in order to avoid that the blocking block 3 blocks the pressure regulating port 2 when the oil and gas is not leaked, the blocking block 3 is arranged in two parts, i.e. a counterweight part 12 and a sealing part 13 wrapped outside the counterweight part 12, the counterweight part 12 is also a cylindrical body, and the center of gravity thereof is located at the geometric center of the counterweight part, so as to ensure that the blocking block 3 can maintain a stable suspended state in the initial state, the counterweight part 12 can be made of heavy material resistant to high temperature, such as tantalum hafnium carbide alloy, which can adapt to the harsh environment in the well, the gravity of the counterweight part 12 plus the friction between the blocking block 3 and the oil pipe 4 and the wellbore 5 is used for offsetting the magnetic force between the first magnetic ring 8 and the second magnetic ring 9 in the initial state (when the blocking block 3 is suspended in the annular space 6 and the oil and gas is not leaked), and the sealing part 13 can be made of rubber material resistant to high temperature, which can adapt to the harsh environment in the well, and is used for filling the gap between the blocking block 3 and the base 1 and between the blocking block 3 and the outer wall of the oil pipe 4 when the blocking block 3 blocks the pressure regulating port 2, so as to increase the sealing property between the blocking block 3 and the pressure regulating port 2, when the oil and gas in the well is leaked, at this time, the blocking block 3 is subjected to the downward gravity of itself and the upward thrust of the oil and gas, the upward thrust of the oil and gas offsets a part of the gravity, under the action of the hanger rod 7, the first magnetic ring 8 moves to the second magnetic ring 9, so that the first magnetic ring 8 and the second magnetic ring 9 attract each other, and simultaneously drive the blocking block 3 to move along the annular space 6 to the side close to the pressure regulating port 2, after the blocking block 3 blocks the pressure regulating port 2, the first magnetic ring 8 and the second magnetic ring 9 are magnetically connected, when there is a pipe string such as a drilling tool and the oil pipe 4 in the well, the blowout preventer can close the annular space 6 between the pipe string and the wellbore 5, so as to prevent the fluid from being sprayed out of the annular space 6.

[0022] Further, as Figures 1-2As shown, in order to facilitate the staff to perceive the well pressure abnormal fluctuations in advance when the manual plugging pressure regulating port 2, the base 1 outside the opening of the multilayer adjustment hole 18, so that the protective cover 14 and base 1 in the installation bolt 17 and adjustment hole 18 cooperation under the connection, adjustment hole 18 has two layers, two layers of adjustment hole 18 on the base 1 up and down distribution, initial state, installation bolt 17 through the base 1 the top of the adjustment hole 18 with the protective cover 14 and base 1 connection and fixed, when the need to block pressure regulating port 2, remove the installation bolt 17, so that the protective cover 14 moves down, shorten the distance between the first magnetic ring 8 and the second magnetic ring 9, so that the first magnetic ring 8 and the second magnetic ring 9 are magnetically connected, driving the blocking block 3 to move up to the pressure regulating port 2, blocking the annular space 6 between the wellbore 5 and the tubing 4, at this time the bolt is used through the adjustment hole 18 below the base 1 to fix the protective cover 14 and the base 1.

[0023] Further, as shown in Figure 2 In order to avoid the blocking block 3 is hit by the oil and gas back out of the pressure regulating port 2, as shown in Figure 2 The upper part of the sealing part 13 can be provided with a boss with a circular hole in the middle, or the upper part of the sealing part 13 can be provided with a stepped shape with a circular hole in the middle, and the side of the base 1 close to the tubing 4 is matched with the sealing part 13. When the blocking block 3 blocks the pressure regulating port 2, the base 1 can limit the blocking block 3 to prevent the blocking block 3 from separating from the base 1.

[0024] Further, as shown in Figures 1-2 In order to prevent the blocking block 3 from leaking out along the pressure regulating hole 11 in the process of blocking the pressure regulating port 2 while ensuring the balance of the well pressure, if the baffle 10 is located away from the pressure regulating port 2, the first solution: an extension block 15 can be added to the bottom of the blocking block 3 to lengthen the length of the blocking block 3. When the oil and gas contact the extension block 15, a pushing force can be applied to the blocking block 3, so that the blocking block 3 can be pushed to block the pressure regulating port 2 when the oil and gas does not contact the baffle 10. The extension block 15 can be made of lightweight materials such as aluminum alloy to avoid increasing the weight of the blocking block 3, which can cause the blocking block 3 to be unable to tightly block the pressure regulating port 2 under the magnetic force of the first magnetic ring 8 and the second magnetic ring 9; the second solution: the thickness of the baffle 10 can be lengthened to increase the length of the pressure regulating hole 11, thereby increasing the distance and time of the oil and gas passing through the pressure regulating hole 11. That is, when the oil and gas does not pass through the baffle 10, the blocking block 3 can completely block the pressure regulating hole 11 to avoid oil and gas leakage.

[0025] It should be noted that in this paper, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment. The principle and implementation of the present application are described by applying specific examples. The above examples are only used to help understand the method and its core idea of the present application. The above is only the preferred embodiment of the present application. It should be pointed out that due to the limited expression of the text, there are objectively infinite specific structures. For ordinary skilled persons in the art, without departing from the principle of the present application, some improvements, refinements or changes can be made, and the above technical features can be combined in a proper way; these improvements, refinements, changes or combinations, or without improvement, the concept and technical scheme of the invention are directly applied to other occasions, which should be regarded as the protection scope of the present application.

Claims

1. A sucker rod blowout preventer, characterized by: The utility model relates to a wellhead pressure regulating device, which comprises: a base (1) installed on the top of a wellhead, a pressure regulating port (2) being formed in the middle of the base (1); a blocking block (3) arranged in an annular space (6) between a tubing (4) and a wellbore (5) and in sliding contact with the tubing (4), used for blocking the pressure regulating port (2) when oil and gas leak; a suspender (7) used for suspending the blocking block (3) and in sliding connection with the base (1); a first magnetic ring (8) fixedly connected to one end of the suspender (7) away from the blocking block (3); a second magnetic ring (9) installed on a protective cover (14) on the top of the base (1), the first magnetic ring (8) being in magnetic attraction connection with the second magnetic ring (9) when the blocking block (3) blocks the pressure regulating port (2).

2. A blowout preventer for sucker rods as defined in claim 1, characterized in that: The blocking block (3) is integrally formed with a baffle (10) on the side away from the tubing (4), the baffle (10) being in sliding contact with the inner wall of the wellbore (5) and uniformly provided with a plurality of pressure regulating holes (11).

3. A sucker rod blowout preventer according to claim 1, characterized in that: The blocking block (3) comprises: a counterweight part (12) used for counteracting the magnetic force between the first magnetic ring (8) and the second magnetic ring (9) in an initial state and maintaining the structural stability of the blocking block (3); a sealing part (13) wrapped outside the counterweight part (12), used for increasing the sealing property between the blocking block (3) and the pressure regulating port (2).

4. A sucker rod blowout preventer according to claim 1, characterized in that: The protective cover (14) is in movable connection with the base (1), used for adjusting the distance between the first magnetic ring (8) and the second magnetic ring (9).

5. A sucker rod blowout preventer according to claim 1, characterized in that: The shape of the blocking block (3) includes but is not limited to a stepped shape and a boss shape, and the pressure regulating port (2) is matched with the blocking block (3).

6. A sucker rod blowout preventer according to claim 1, characterized in that: The blocking block (3) is fixedly connected with an extension boss (15) at the end away from the wellhead.

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