A high pressure corrosion resistant wear resistant general blowout preventer and method of use

Abstract

The application discloses a high-pressure corrosion-resistant wear-resistant general blowout preventer and a use method thereof, and belongs to the technical field of well digging.The high-pressure corrosion-resistant wear-resistant general blowout preventer comprises a pressure cap, the bottom of the pressure cap is provided with a pipeline, the top of the pressure cap is provided with a drilling machine, the lower portion of the drilling machine is provided with a drill rod, the drill rod penetrates through the pipeline, the outer side of the pipeline is provided with an upper arm and a lower arm from top to bottom, the inner portion of the lower arm is provided with a lower hydraulic rod, one end of the lower hydraulic rod close to the pipeline is fixedly connected with a sealing block, the other end of the lower hydraulic rod away from the pipeline is connected with a lower hydraulic cylinder, the inner portion of the upper arm is provided with an upper hydraulic rod, one end of the upper hydraulic rod close to the pipeline is fixedly connected with a shearing block, and the other end of the upper hydraulic rod away from the pipeline is connected with an upper hydraulic cylinder.The blowout preventer is made of high-strength steel structure, has high strength, can bear great pressure, and is covered with an anticorrosive coating on the outer surface and has strong corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of well drilling technology, and more specifically, to a high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer and its application method. Background Technology

[0002] Blowout preventers (BOPs) are used to close the wellhead during operations such as well testing, well workover, and well completion to prevent blowout accidents. They combine the functions of full sealing and partial sealing into one unit and are characterized by simple structure, easy operation, and high pressure resistance. They are commonly used safety sealing devices for preventing blowouts in oilfields.

[0003] Patent No. CN108868684B provides a high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer, comprising: a blowout preventer body, a channel, a shearing device, a buffer device, a left arm of the blowout preventer, a right arm of the blowout preventer, a first control system, and a second control system; the blowout preventer body has a through hole; the channel is transverse to the through hole; the lower end of the blowout preventer body has a pressure relief device, which causes the liquid flowing through the through hole to concentrate towards the axis of the through hole; the shearing device is disposed in the left arm of the blowout preventer, and the buffer device is disposed in the right arm of the blowout preventer; the first control system controls the shearing device to advance along the channel and pass through the through hole; the channel forms a chamber on the right side of the buffer device, and the second control system controls the air pressure value in the chamber.

[0004] Although the invention described above is high-pressure resistant, corrosion-resistant, and wear-resistant, blowout preventers are often controlled manually or by measuring the flow rate or pressure of the liquid in the pipeline using instruments. The start-up of the blowout preventer has a certain delay, and some liquid has already sprayed out when it is shut down, making cleanup inconvenient. If it is manually operated, the delay is even greater, which may injure the surrounding workers. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] The purpose of this invention is to provide a high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer and its application method, in order to solve the problems mentioned in the background art above:

[0007] When using blowout preventers, they are often controlled by manual operation or by measuring the flow rate or pressure of the liquid in the pipeline. The start-up of the blowout preventer has a certain delay, and some liquid has already sprayed out when it is shut down, which is inconvenient to clean up. If it is operated manually, the delay is even greater, which may injure the surrounding workers.

[0008] 2. Technical Solution

[0009] A high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer includes a pressure cap, a pipe at the bottom of the pressure cap, a drilling machine at the top of the pressure cap, a drill rod below the drilling machine, and the drill rod penetrating the pipe. An upper arm and a lower arm are arranged from top to bottom on the outer side of the pipe. A lower hydraulic rod is housed inside the lower arm, with a sealing block fixedly connected to the end of the lower hydraulic rod near the pipe, and a lower hydraulic cylinder connected to the end of the lower hydraulic rod away from the pipe. An upper hydraulic rod is housed inside the upper arm, with a shearing block fixedly connected to the end of the upper hydraulic rod near the pipe, and an upper hydraulic cylinder connected to the end of the upper hydraulic rod away from the pipe. This blowout preventer is constructed of high-strength steel, possessing high strength and capable of withstanding significant pressure, and its outer surface is covered with an anti-corrosion coating, providing strong corrosion resistance.

[0010] The pipeline is equipped with a pressure relief pipe at the same height position of the lower arm and the upper arm. A control component is installed below the pressure relief pipe, and the control component is used to automatically control the opening and closing of the pressure relief pipe.

[0011] The control component includes a housing located at the bottom of the lower pressure relief pipe and on the outside of the pipe. An external threaded rod is threaded through the end of the housing away from the pipe. A retractable inner rod is fitted into the end of the external threaded rod away from the pipe. A knob is fixedly connected to the other end of the inner rod. A plug is located on the same side of the knob on the inner rod. Several insertion holes are opened on the same side of the housing and the plug, and these insertion holes are centrally symmetrically distributed with the external threaded rod as the central axis.

[0012] It also includes a pressure assembly, which includes a large threaded rod and a compression ball. The compression ball is disposed at one end of the large threaded rod near the pipe and is located inside the pipe. A limiting ring is fixedly sleeved on the outer side of the large threaded rod. A limiting groove corresponding to the limiting ring is opened inside the outer shell. A bevel gear B is threaded on the outer side of the large threaded rod. The bevel gear B is fixedly connected to the inner wall of the outer shell through a bearing.

[0013] A movable plate is connected to one end of the external threaded rod near the large threaded rod. A spring is provided between the movable plate and the large threaded rod, and the two ends of the spring are respectively connected to the movable plate and the large threaded rod.

[0014] The pressure relief pipe is equipped with a valve core inside, and a valve stem is fixedly connected to the bottom of the valve core. A bevel gear A is fixedly connected to the bottom of the valve stem. The bevel gear A meshes with a bevel gear B for transmission. The bevel gear A is located inside the outer casing.

[0015] A switching assembly is provided at the bottom of the end of the large threaded rod near the external threaded rod. The switching assembly includes a movable metal wire, which is located below the large threaded rod. Movable grooves are provided on both sides of the movable metal wire. A first contact and a second contact are provided on the inner side of the movable grooves. The first contact is closer to the inside of the pipe than the second contact.

[0016] The first contact is connected to the oil pump controlling the lower hydraulic cylinder via a wire, and the socket is connected to the oil pump controlling the upper hydraulic cylinder via a wire.

[0017] A method for controlling a high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer includes the following steps:

[0018] S1. First, place the drilling machine on top of the pressure cap, then start the drilling machine. The drill rod descends inside the pipe and drills a hole.

[0019] S2. Rotating the knob can change the position of the moving plate and adjust the blowout preventer operating threshold according to the well conditions.

[0020] S3. When the internal pressure of the pipeline increases and the large threaded rod moves a certain distance, the moving metal wire first contacts the first contact point, the lower hydraulic cylinder is activated, the sealing block seals the pipeline, and the pressure relief pipe closes at the same time.

[0021] S4. If the pressure continues to increase, the moving metal wire will move to the second contact point, the upper hydraulic cylinder will be activated, and the shearing block will cut the drill rod, completely avoiding the risk.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the advantages of this invention are:

[0024] 1) When using this invention, the drilling machine needs to be placed on top of the pressure cap first, and then the drilling machine is started. The drill rod descends inside the pipe and drills a hole. The mud produced by drilling overflows from the pressure relief pipe. When oil or other liquids are sprayed out, the lower hydraulic rod moves to make the sealing block wrap around the drill rod, thus sealing the pipe. If the pressure is still too high, the upper hydraulic rod moves to make the shearing block shear the drill rod and cut it short. Double protection provides stronger safety performance.

[0025] 2) The present invention can automatically open and close the pressure relief pipe by setting the control components. When the pressure inside the pipe increases, the large threaded rod moves inward. At this time, the bevel gear B rotates, which drives the bevel gear A to rotate, causing the valve core to rotate and the pressure relief pipe to close. The mud inside the pipe cannot be discharged, preventing the mud from spraying out and injuring the surrounding workers.

[0026] 3) Rotating the knob can change the position of the moving plate, increasing the spring's shortening and elasticity. The large threaded rod needs to be subjected to greater pressure to move the same distance, thus changing the blowout preventer's operating threshold. When using it, you need to first pull the knob outward so that the insert rod is disengaged from the insertion hole, and the knob can rotate freely. Then rotate the knob to change the position of the moving plate, thereby adjusting the blowout preventer's operating threshold according to different well conditions.

[0027] 4) When the large threaded rod moves a certain distance, the moving metal wire first contacts the first contact point, the lower hydraulic cylinder is activated, and the sealing block seals the pipeline. If the pressure continues to increase, the moving metal wire will move to the second contact point, the upper hydraulic cylinder is activated, and the shearing block cuts the drill rod, thus completely avoiding risks, achieving automation and speed, and preventing excessive delays in manual operation from injuring workers. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the control device of the present invention;

[0031] Figure 4 for Figure 3 Enlarged view of point A;

[0032] Figure 5 This is a top view of the switching component of the present invention.

[0033] The following are the labeling instructions in the diagram: 1. Pressure cap; 2. Pipe; 3. Lower arm; 301. Lower hydraulic rod; 302. Sealing block; 4. Upper arm; 401. Upper hydraulic rod; 402. Shearing block; 5. Pressure relief pipe; 501. Valve core; 502. Valve stem; 503. Bevel gear A; 6. Control assembly; 601. Housing; 602. Knob; 603. Insert rod; 604. Insertion hole; 605. Inner rod; 606. External threaded rod; 607. Moving plate; 608. Spring; 609. Limiting groove; 7. Pressure assembly; 701. Extrusion ball; 702. Bevel gear B; 703. Bearing; 704. Limiting ring; 705. Large threaded rod; 8. Switching assembly; 801. Moving metal wire; 802. Moving groove; 803. Contact No. 1; 804. Contact No. 2. Detailed Implementation

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Example 1:

[0038] A high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer includes a pressure cap 1, a pipe 2 at the bottom of the pressure cap 1, a drilling machine at the top of the pressure cap 1, a drill rod below the drilling machine, the drill rod penetrating the pipe 2, an upper arm 4 and a lower arm 3 arranged from top to bottom on the outside of the pipe 2, a lower hydraulic rod 301 arranged inside the lower arm 3, a sealing block 302 fixedly connected to the end of the lower hydraulic rod 301 near the pipe 2, and a lower hydraulic cylinder connected to the end of the lower hydraulic rod 301 away from the pipe 2, and an upper hydraulic rod 401 arranged inside the upper arm 4, a shearing block 402 fixedly connected to the end of the upper hydraulic rod 401 near the pipe 2, and an upper hydraulic cylinder connected to the end of the upper hydraulic rod 401 away from the pipe 2.

[0039] Pipe 2 is located at the same height as the lower arm 3 and the upper arm 4, and pressure relief pipe 5 is installed. Below pressure relief pipe 5, control component 6 is installed. Control component 6 is used to automatically control the opening and closing of pressure relief pipe 5.

[0040] When using this invention, the drilling machine needs to be placed on top of the pressure cap 1 first, and then the drilling machine is started. The drill rod descends inside the pipe 2 and drills a hole. The mud produced by drilling overflows from the pressure relief pipe 5. When oil or other liquids are sprayed out, the lower hydraulic rod 301 moves to make the sealing block 302 wrap around the drill rod, thus sealing the pipe 2. If the pressure is still too high, the upper hydraulic rod 302 moves to make the shearing block 402 shear the drill rod, cutting the drill rod 402 short. The double-layer protection provides stronger safety performance.

[0041] Example 2:

[0042] The control component 6 includes a housing 601, which is located at the bottom of the lower pressure relief pipe 5 and on the outside of the pipe 2. The end of the housing 601 away from the pipe 2 is threadedly connected to an external threaded rod 606. The end of the external threaded rod 606 away from the pipe 2 is fitted with a telescopic inner rod 605. The inner rod 605 and the external threaded rod 606 rotate synchronously. The other end of the inner rod 605 is fixedly connected to a knob 602. A plug rod 603 is located on the same side of the knob 602 and the inner rod 605. Several insertion holes 604 are opened on the same side of the housing 601 and the plug rod 603. The insertion holes 604 are centrally symmetrically distributed with the external threaded rod 606 as the central axis.

[0043] It also includes a pressure assembly 7, which includes a large threaded rod 705 and a compression ball 701. The compression ball 701 is located at one end of the large threaded rod 705 near the pipe 2 and inside the pipe 2. The compression ball 701 is spherical, which can increase the contact surface with the mud inside the pipe 2 and can better measure the pressure. The greater the mud pressure, the longer the large threaded rod 705 moves inward. A limiting ring 704 is fixedly sleeved on the outside of the large threaded rod 705 to restrict the movement of the large threaded rod 705 and prevent it from being squeezed out by the spring 608. A limiting groove 609 corresponding to the limiting ring 704 is opened inside the outer shell 601. A bevel gear B702 is threaded on the outside of the large threaded rod 705. When the large threaded rod 705 moves, the bevel gear B702 rotates accordingly. The bevel gear B702 is fixedly connected to the inner wall of the outer shell 601 through a bearing 703.

[0044] A movable plate 607 is connected to one end of the external threaded rod 606 near the large threaded rod 705. A spring 608 is installed between the movable plate 607 and the large threaded rod 705, with both ends of the spring 608 connected to the movable plate 607 and the large threaded rod 705, respectively. Rotating the knob 602 changes the position of the movable plate 607, increasing the shortening of the spring 608 and its elastic force. This requires the large threaded rod 705 to withstand greater pressure to move the same distance, thereby changing the blowout preventer's operating threshold.

[0045] The pressure relief pipe 5 is equipped with a valve core 501. The bottom of the valve core 501 is fixedly connected to a valve stem 502. The bottom of the valve stem 502 is fixedly connected to a bevel gear A503. The bevel gear A503 meshes with the bevel gear B702 for transmission. The bevel gear A503 is located inside the housing 601.

[0046] The present invention can automatically open and close the pressure relief pipe 5 by setting the control component 6. When the pressure inside the pipe 2 increases, the large threaded rod 705 moves inward. At this time, the bevel gear B702 rotates, which drives the bevel gear A503 to rotate, causing the valve core 501 to rotate and the pressure relief pipe 5 to close. The mud inside the pipe 2 cannot be discharged, preventing the mud from spraying out and injuring the surrounding workers.

[0047] Rotating knob 602 changes the position of the moving plate 607, increasing the shortening of spring 608 and its elastic force. The large threaded rod 705 needs to be subjected to greater pressure to move the same distance, thereby changing the working threshold of the blowout preventer. In use, knob 602 needs to be pulled outward first to disengage the insertion rod 603 from the insertion hole 604, allowing knob 602 to rotate freely. Then, rotating knob 602 changes the position of the moving plate 607, thereby adjusting the working threshold of the blowout preventer according to different well conditions.

[0048] Example 3:

[0049] A switching component 8 is provided at the bottom of one end of the large threaded rod 705 near the external threaded rod 606. The switching component 8 includes a movable metal wire 801, which is located below the large threaded rod 705. Movable grooves 802 are provided on both sides of the movable metal wire 801. A first contact 803 and a second contact 804 are provided on the inner side of the movable groove 802. The first contact 803 is closer to the inside of the pipe 2 than the second contact 804.

[0050] Contact 803 is connected to the oil pump controlling the lower hydraulic cylinder via a wire, and socket 604 is connected to the oil pump controlling the upper hydraulic cylinder via a wire.

[0051] When the large threaded rod 705 moves a certain distance, the moving metal wire 801 first contacts the first contact 803, the lower hydraulic cylinder is activated, and the sealing block 302 seals the pipe 2. If the pressure continues to increase, the moving metal wire 801 will move to the second contact 804, the upper hydraulic cylinder will be activated, and the shearing block 402 will cut the drill rod, thus completely avoiding risks, achieving automation and speed, and preventing excessive delays in manual operation from injuring workers.

[0052] A method for controlling a high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer includes the following steps:

[0053] S1. First, place the drilling machine on top of the pressure cap 1, then start the drilling machine. The drill rod descends inside the pipe 2 and drills a hole.

[0054] S2. Rotating knob 602 can change the position of moving plate 607 and change the working threshold of blowout preventer according to well conditions;

[0055] S3. When the internal pressure of pipe 2 increases and the large threaded rod 705 moves a certain distance, the moving metal wire 801 first contacts the first contact point 803, the lower hydraulic cylinder is activated, the sealing block 302 seals pipe 2, and at the same time the pressure relief pipe 5 is closed.

[0056] S4. If the pressure continues to increase, the moving metal wire 801 will move to the second contact 804, the upper hydraulic cylinder will be activated, and the shearing block 402 will cut the drill rod, thus completely avoiding the risk.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure, corrosion-resistant, wear-resistant, universal blowout preventer, comprising a pressure cap (1), a pipe (2) disposed at the bottom of the pressure cap (1), a drilling machine disposed at the top of the pressure cap (1), a drill rod disposed below the drilling machine, the drill rod penetrating the pipe (2), and an upper arm (4) and a lower arm (3) disposed from top to bottom on the outer side of the pipe (2), characterized in that: The lower arm (3) is equipped with a lower hydraulic rod (301) inside. A sealing block (302) is fixedly connected to the end of the lower hydraulic rod (301) near the pipe (2). The end of the lower hydraulic rod (301) away from the pipe (2) is connected to a lower hydraulic cylinder. The upper arm (4) is equipped with an upper hydraulic rod (401) inside. A shearing block (402) is fixedly connected to the end of the upper hydraulic rod (401) near the pipe (2). The end of the upper hydraulic rod (401) away from the pipe (2) is connected to an upper hydraulic cylinder. The pipe (2) A pressure relief pipe (5) is provided at the same height position on the lower arm (3) and the upper arm (4). A control component (6) is provided below the pressure relief pipe (5). The control component (6) is used to automatically control the opening and closing of the pressure relief pipe (5). The control component (6) includes a housing (601). The housing (601) is located at the bottom of the lower pressure relief pipe (5) and is located on the outside of the pipe (2). The end of the housing (601) away from the pipe (2) is threadedly connected to an external threaded rod (606). A retractable inner rod (605) is fitted at one end away from the pipe (2). A knob (602) is fixedly connected to the other end of the inner rod (605). A plug (603) is provided on the same side of the knob (602) and the inner rod (605). Several insertion holes (604) are opened on the same side of the outer shell (601) and the plug (603). The insertion holes (604) are centrally symmetrically distributed with the external thread rod (606) as the central axis. The outer shell (601) also includes a pressure assembly (7). The pressure assembly (7) includes a large thread rod (705) and a compression ball (7). 01), the extrusion ball (701) is disposed at one end of the large threaded rod (705) near the pipe (2), the extrusion ball (701) is located inside the pipe (2), the outer side of the large threaded rod (705) is fixedly sleeved with a limiting ring (704), the inner side of the outer shell (601) is provided with a limiting groove (609) corresponding to the limiting ring (704), the outer side of the large threaded rod (705) is threaded with a bevel gear B (702), the bevel gear B (702) is fixedly connected to the inner wall of the outer shell (601) through a bearing (703).

2. The high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer according to claim 1, characterized in that: The external threaded rod (606) is connected to a movable plate (607) at one end near the large threaded rod (705). A spring (608) is provided between the movable plate (607) and the large threaded rod (705). The two ends of the spring (608) are connected to the movable plate (607) and the large threaded rod (705) respectively.

3. The high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer according to claim 2, characterized in that: The pressure relief pipe (5) is provided with a valve core (501) inside. A valve stem (502) is fixedly connected to the bottom of the valve core (501). A bevel gear A (503) is fixedly connected to the bottom of the valve stem (502). The bevel gear A (503) meshes with the bevel gear B (702) for transmission. The bevel gear A (503) is located inside the outer shell (601).

4. The high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer according to claim 3, characterized in that: A switching component (8) is provided at the bottom of the end of the large threaded rod (705) near the external threaded rod (606). The switching component (8) includes a movable metal wire (801) located below the large threaded rod (705). Movable grooves (802) are provided on both sides of the movable metal wire (801). A first contact (803) and a second contact (804) are provided on the inner side of the movable groove (802). The first contact (803) is closer to the inside of the pipe (2) than the second contact (804).

5. A high-pressure, corrosion-resistant, wear-resistant, universal blowout preventer according to claim 4, characterized in that: The first contact (803) is connected to the oil pump controlling the lower hydraulic cylinder via a wire, and the socket (604) is connected to the oil pump controlling the upper hydraulic cylinder via a wire.

6. A method of using the high-pressure, corrosion-resistant, and wear-resistant universal blowout preventer as described in claim 5, characterized in that, Includes the following steps: S1. First, place the drilling machine on top of the pressure cap (1), then start the drilling machine. The drill rod descends inside the pipe (2) and drills a hole. S2. Rotating the knob (602) can change the position of the moving plate (607) and change the working threshold of the blowout preventer according to the well conditions; S3. When the internal pressure of the pipe (2) increases and the large threaded rod (705) moves a certain distance, the moving metal wire (801) first contacts the first contact point (803), the lower hydraulic cylinder starts, the sealing block (302) seals the pipe (2), and at the same time the pressure relief pipe (5) closes. S4. If the pressure continues to increase, the moving metal wire (801) will move to the second contact (804), the upper hydraulic cylinder will be activated, and the shear block (402) will cut the drill rod, thus completely avoiding the risk.

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