CN115898319B - Double-rubber-core composite annular blowout preventer - Google Patents
Double-rubber-core composite annular blowout preventer Download PDFInfo
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- CN115898319B CN115898319B CN202310159953.1A CN202310159953A CN115898319B CN 115898319 B CN115898319 B CN 115898319B CN 202310159953 A CN202310159953 A CN 202310159953A CN 115898319 B CN115898319 B CN 115898319B
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Abstract
The invention discloses a double-rubber-core composite annular blowout preventer, which relates to the technical field of petroleum drilling and production. The top cover covers the top of the main body, and a circle of grooves are formed in the arc-shaped inner wall of the top cover; the spherical rubber core is matched in the top cover, and the conical rubber core is arranged below the spherical rubber core; the first piston is arranged below the conical rubber core and is used for enabling the spherical rubber core and the conical rubber core to move up and down; the second piston is arranged on the periphery of the conical rubber core and is used for closing the conical rubber core; the baffle ring is in sliding fit in the groove under the action of the power source, and when the baffle ring is retracted into the groove, the bottom of the baffle ring and the inner wall of the top cover form a complete arc surface; when the baffle ring extends out of the groove, the baffle ring is used for limiting the upward movement of the spherical rubber core. The scheme of the invention can be used for sealing in a single layer or in a double layer, so that the safety is improved.
Description
Technical Field
The invention relates to the technical field of petroleum drilling and production, in particular to a double-rubber-core composite annular blowout preventer.
Background
The annular blowout preventer is a safety sealing wellhead device for preventing blowout in oil fields, and has the characteristics of simple structure, easy operation, high pressure resistance and the like. Blowout preventers commonly used according to the shape of the rubber core are divided into: the spherical annular blowout preventer and the conical annular blowout preventer are characterized in that the spherical annular blowout preventer uses a spherical rubber core, the working principle is that a piston pushes the spherical rubber core upwards, the spherical rubber core is upwards under the action of the arc-shaped inner wall of a top cover, the radian is smaller, the rubber core is closed, and the sealing effect is achieved; the piston moves downwards, and the spherical rubber core returns by virtue of self resilience force. The conical annular blowout preventer uses a conical rubber core with a large upper part and a small lower part, and the working principle is that a piston moves upwards to extrude the conical rubber core to move inwards so as to realize closing and sealing; the piston moves downwards, and the spherical rubber core returns by virtue of self resilience force.
In the prior art, when the pressure in the well is less than or equal to 70Mpa, one of a spherical annular blowout preventer and a conical annular blowout preventer is generally used for sealing, but when the pressure in the well is more than or equal to 70Mpa, namely a high-pressure well, the corresponding requirement on a sealing element is higher, and the single spherical annular blowout preventer cannot meet the sealing requirement, so that the double-rubber-core composite annular blowout preventer is provided for well control safety.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the double-rubber-core composite annular blowout preventer which can be used for sealing in a single layer or double layers, and the safety is improved.
In order to achieve the object of the invention, the following scheme is adopted:
a double-rubber-core composite annular blowout preventer comprises a top cover, a main body, a baffle ring, a spherical rubber core, a conical rubber core, a first piston and a second piston, wherein the spherical rubber core, the conical rubber core, the first piston and the second piston are arranged in the main body.
The top cover covers the top of the main body, and a circle of grooves are formed in the arc-shaped inner wall of the top cover;
the spherical rubber core is matched in the top cover, and the conical rubber core is arranged below the spherical rubber core;
the first piston is arranged below the conical rubber core and is used for enabling the spherical rubber core and the conical rubber core to move up and down;
the second piston is arranged on the periphery of the conical rubber core and is used for closing the conical rubber core;
the baffle ring is in sliding fit in the groove under the action of the power source, and when the baffle ring is retracted into the groove, the bottom of the baffle ring and the inner wall of the top cover form a complete arc surface; when the baffle ring extends out of the groove, the baffle ring is used for limiting the upward movement of the spherical rubber core.
Further, the main body sequentially comprises a first vertical surface, an inclined surface, a second vertical surface, a first transverse surface, a third vertical surface and a second transverse surface from top to bottom, wherein the third vertical surface is vertically and downwards arranged from the first transverse surface and extends upwards, the second transverse surface faces the outer side direction of the blowout preventer, an annular area is formed among the second vertical surface, the first transverse surface and the third vertical surface, an inverted cone table area is formed inside the inclined surface, and a cylindrical area is formed inside the first vertical surface.
Further, be equipped with first baffle and the second baffle that is located its below in the annular region, first baffle, second baffle outer wall all are connected in the second vertical plane, and first baffle width is less than the second baffle.
Further, the cross section of the first piston is Z-shaped, and sequentially comprises a first transverse section attached to the first transverse surface, a vertical section attached to the third vertical surface, a second transverse section attached to the top of the third vertical surface, a second partition plate inner wall attached to the third vertical surface, and a conical rubber core arranged on the second transverse section.
Further, the third baffle is vertically arranged at the top of the second baffle, the section of the second piston is Z-shaped, the section sequentially comprises a first flat section attached to the second baffle, a longitudinal section attached to the third baffle, a second flat section attached to the top of the third baffle, and an inclined section inclined downwards towards the inside of the blowout preventer, the conical rubber core is attached to the inclined section, and the inner wall of the first baffle is attached to the longitudinal section.
Further, the second vertical surface is provided with a second oil inlet, a second oil outlet, a first oil inlet and a first oil outlet from top to bottom in sequence, wherein the first oil inlet and the first oil outlet are used for regulating and controlling the first piston, and the second oil inlet and the second oil outlet are used for regulating and controlling the second piston.
Further, indulge the section outer wall and be equipped with the backup pad that the cross-section is L type, backup pad outer wall laminating is first vertical face, and first flat section top is equipped with the multilayer regulating plate, and every layer includes a plurality of regulating plates, and every regulating plate that is located the top layer all is connected in the backup pad through flexible subassembly, and flexible subassembly is used for expanding the order of multilayer regulating plate from the top down in proper order, and the toper gum core is hugged closely in the regulating plate.
Further, the regulating plate at the bottommost layer is in sliding fit with the first flat section through the sliding block, and the regulating plates at the other layers are respectively in sliding fit with the regulating plate at the next layer through the sliding block.
Further, the top cover bottom is provided with a circle of avoidance groove, the avoidance groove is positioned on the outer side of the arc-shaped inner wall, and the periphery of the bottom of the spherical rubber core is provided with a circle of notch.
Further, the outer wall of the baffle ring is provided with a circle of annular groove, a fourth baffle plate is arranged in the groove and is in sliding fit in the annular groove, the outer wall of the groove is provided with a third upper oil port and a third lower oil port from top to bottom, and the third upper oil port and the third lower oil port are used for regulating and controlling the baffle ring.
Further, first supporting ribs are uniformly distributed in the spherical rubber core, second supporting ribs are uniformly distributed in the conical rubber core, and the first supporting ribs and the second supporting ribs are arranged in a vertically crossing mode.
The invention has the beneficial effects that:
1. the spherical rubber core and the conical rubber core are simultaneously arranged in the blowout preventer, and the respective functions are realized through the double pistons, so that the single-layer sealing and the double-layer sealing can be independently carried out, and the sealing requirements of a low-pressure well and a high-pressure well are met.
2. First supporting ribs made of metal are uniformly distributed in the spherical rubber core, second supporting ribs made of metal are uniformly distributed in the conical rubber core, and the first supporting ribs and the second supporting ribs are arranged in a vertically crossing mode, so that the rubber core is closed more uniformly.
3. The invention is provided with a first baffle and a second baffle, and the functions of the baffles are as follows: the first is to form a sealed space to prevent oil leakage; and the second is to limit the maximum moving distance of the piston, so that the rubber core just contacts the drill rod, the sealing can be realized, and the loss of the rubber core is small.
4. The adjusting plate with a special structure is designed at the top of the first flat section and is used for reducing extrusion of the spherical rubber core in the process of moving up the second piston, so that useless loss of the spherical rubber core is reduced.
Drawings
FIG. 1 is a cross-sectional view of a blowout preventer of an embodiment;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is a block diagram of a spherical rubber core of an embodiment;
FIG. 5 is a diagram of a cone-shaped core structure of an embodiment;
FIG. 6 is a cross-sectional view of a body of an embodiment;
FIG. 7 is a cross-sectional view of a top cover of an embodiment;
FIG. 8 is a first piston cross-sectional view of an embodiment;
FIG. 9 is a second piston cross-sectional view of an embodiment;
FIG. 10 is a top view of the interior of the body of the embodiment;
reference numerals: the novel hydraulic oil well sealing device comprises a top cover-11, a main body-12, a baffle ring-6, a spherical rubber core-2, a conical rubber core-3, a first piston-4, a second piston-5, a groove-111, a first vertical surface-1-1, an inclined surface-1-2, a second vertical surface-1-3, a first transverse surface-1-4, a third vertical surface-1-5, a second transverse surface-1-6, a first partition plate-131, a second partition plate-132, a first transverse section-4-1, a vertical section-4-2, a second transverse section-4-3, a third partition plate-133, a first flat section-5-1, a longitudinal section-5-2, a second flat section-5-3, an inclined section-5-4, a second upper oil port-151, a second lower oil port-152, a first upper oil port-141, a first lower oil port-142, a supporting plate-51, a regulating plate-52, a dodging groove-112, a notch-21, an annular groove-61, a fourth partition plate-115, a third upper oil port-113 and a third lower oil port 114.
Detailed Description
As shown in fig. 1, the present embodiment provides a dual-core composite annular blowout preventer, which comprises a top cover 11, a main body 12, a baffle ring 6, a spherical rubber core 2, a conical rubber core 3, a first piston 4 and a second piston 5.
Specifically, the top cover 11 covers the top of the main body 12 and is fixedly connected with the top, the spherical rubber core 2, the conical rubber core 3, the first piston 4 and the second piston 5 are all arranged inside the main body 12, the spherical rubber core 2 is arranged in the top cover 11 and clings to the arc-shaped inner wall of the top cover 11, the conical rubber core 3 is arranged below the spherical rubber core 2, the first piston 4 is arranged below the conical rubber core 3, and the first piston 4 is used for enabling the spherical rubber core 2 and the conical rubber core 3 to move up and down together in a hydraulic control mode, so that the spherical rubber core 2 is sealed in the upward moving process. The second piston 5 is arranged on the periphery of the conical rubber core 3, and the second piston 5 is used for enabling the conical rubber core 3 to move inwards in a hydraulic control mode, so that sealing is achieved.
Specifically, first supporting ribs made of metal are uniformly distributed in the spherical rubber core 2, second supporting ribs made of metal are uniformly distributed in the conical rubber core 3, and the first supporting ribs and the second supporting ribs are arranged in a vertically crossed mode, so that the rubber core is closed more uniformly, and the crossed mode means that the second supporting ribs are located in the middle of two adjacent first supporting ribs or the first supporting ribs are located in the middle of two adjacent second supporting ribs.
In this embodiment, the composite annular blowout preventer means that the spherical rubber core 2 and the conical rubber core 3 are simultaneously arranged in one blowout preventer, and the respective functions are realized through double pistons, so that the sealing requirements of a low-pressure well and a high-pressure well can be met by independently performing single-layer sealing and double-layer sealing.
When the upper layer of the well drilling needs to be sealed, the first piston 4 is started; when both the upper and lower layers of the well are to be sealed, the first piston 4 and the second piston 5 are activated. In order to seal the lower layer of the well independently, in this embodiment, a circle of groove 111 is provided at the upper edge of the arc inner wall of the top cover 11, the baffle ring 6 is slidably fitted in the groove 111 under the action of a power source, the power source can be hydraulically controlled, and when the baffle ring 6 is completely retracted into the groove 111, the bottom of the baffle ring 6 and the inner wall of the top cover 11 form a complete arc surface, so that the spherical rubber core 2 can move up smoothly; when the retainer ring 6 extends out of the groove 111, the arc-shaped inner wall of the top cover 11 is blocked, and the retainer ring 6 blocks the spherical rubber core 2 on the outer side of the spherical rubber core 2, so that the spherical rubber core 2 is limited to move upwards. When the lower layer of the well needs to be sealed, the baffle ring 6 extends out of the groove 111, and then the second piston 5 is started.
More specifically, the manner in which the hydraulically controlled retainer ring 6 expands and contracts is as follows: as shown in fig. 2, a ring-shaped groove 61 is formed on the outer wall of the baffle ring 6, a fourth partition plate 115 is arranged in the groove 111, the outer wall of the fourth partition plate 115 is connected to the groove 111, when the baffle ring 6 stretches in the vertical direction, the fourth partition plate 115 is slidably matched in the annular groove 61, a third oil inlet 113 and a third oil outlet 114 are formed on the outer wall of the groove 111 from top to bottom, and the third oil inlet 113 and the third oil outlet 114 are all located above the fourth partition plate 115 and are used for regulating and controlling the baffle ring 6. In use, the injection of the third lower port 114 with hydraulic oil causes the retainer 6 to move upward; and then the hydraulic oil of the third lower oil port 114 is discharged, and the hydraulic oil is injected into the third upper oil port 113 to cause the baffle ring 6 to move downwards.
The fourth partition 115 firstly plays a role in preventing oil leakage, secondly limits the maximum moving distance of the baffle ring 6, when the bottom surface of the fourth partition 115 contacts the baffle ring 6, the baffle ring 6 completely retracts into the groove 111 at this time, and the bottom of the baffle ring 6 and the inner wall of the top cover 11 form a complete arc surface; when the top surface of the fourth diaphragm 115 contacts the retainer ring 6, the retainer ring 6 extends out of the groove 111 to limit the upward movement of the spherical rubber core 2.
More specifically, as shown in fig. 6, the main body 12 sequentially comprises a first vertical surface 1-1, an inclined surface 1-2, a second vertical surface 1-3, a first transverse surface 1-4, a third vertical surface 1-5 and a second transverse surface 1-6 from top to bottom, wherein the inclined surface 1-2 is obliquely downwards arranged towards the inside of the blowout preventer, the first transverse surface 1-4 is vertically downwards arranged towards the inside of the blowout preventer, the third vertical surface 1-5 extends upwards from the first transverse surface 1-4, the second transverse surface 1-6 is arranged towards the outer side direction of the blowout preventer from the lowest position of the third vertical surface 1-5, an annular area is formed among the second vertical surface 1-3, the first transverse surface 1-4 and the third vertical surface 1-5, an inverted cone area is formed inside the inclined surface 1-2, and a cylindrical area is formed inside the first vertical surface 1-1.
More specifically, a first horizontal partition plate 131 and a second horizontal partition plate 132 are arranged in the annular area, the first partition plate 131 is located above the second partition plate 132, the outer walls of the first partition plate 131 and the second partition plate 132 are connected to the second vertical surface 1-3, the width of the first partition plate 131 is smaller than that of the second partition plate 132, a third partition plate 133 is vertically arranged at the top of the second partition plate 132, and the top of the third partition plate 133 is higher than that of the first partition plate 131.
More specifically, the first piston 4 is disposed in the annular region, the cross section of the first piston 4 is zigzag, as shown in fig. 8, and sequentially includes a first transverse section 4-1 attached to the first transverse surface 1-4, a vertical section 4-2 attached to the third vertical surface 1-5, a second transverse section 4-3 attached to the top of the third vertical surface 1-5, an inner wall of the second partition 132 is attached to the third vertical surface 1-5, and the taper rubber core 3 is disposed on the second transverse section 4-3. The second vertical surface 1-3 is provided with a first oil inlet 141 and a first oil outlet 142 positioned below the first vertical surface, and the first oil inlet 141 and the first oil outlet 142 are positioned between the second partition 132 and the first transverse surface 1-4 and used for regulating and controlling the first piston 4. The outer end of the first transverse section 4-1 is tightly attached to the second vertical surface 1-3, a gap communicated with the first oil outlet 142 is reserved on the bottom surface of the first transverse section 4-1, and when the hydraulic oil injection device is used, hydraulic oil is injected into the first oil outlet 142 to promote the first piston 4 to move upwards; then, the hydraulic oil is discharged from the first lower oil port 142, and the hydraulic oil is injected from the first upper oil port 141 to cause the first piston 4 to move downward.
More specifically, the lower part of the second piston 5 is disposed in the annular region, the upper part is disposed in the inverted cone region and the cylindrical region, the cross section of the second piston 5 is in a zigzag shape, as shown in fig. 9, and sequentially includes a first flat section 5-1 attached to the second partition 132, a longitudinal section 5-2 attached to the third partition 133, a second flat section 5-3 attached to the top of the third partition 133, an inclined section 5-4 inclined downward toward the inside of the blowout preventer, a cone-shaped rubber core 3 attached to the inclined section 5-4, and an inner wall of the first partition 131 attached to the longitudinal section 5-2. The second vertical surface 1-3 is provided with a second upper oil port 151 and a second lower oil port 152 positioned below the second vertical surface, and the second upper oil port 151 and the second lower oil port 152 are positioned between the first partition plate 131 and the second partition plate 132 and used for regulating and controlling the second piston 5. The outer end of the first flat section 5-1 is tightly attached to the second vertical surface 1-3, a gap communicated with the second oil outlet 152 is reserved on the bottom surface of the first flat section 5-1, and when the hydraulic oil injection device is used, hydraulic oil is injected into the second oil outlet 152 to promote the second piston 5 to move upwards; and then the second oil drain port 152 is drained, and the second oil drain port 151 is filled with hydraulic oil to drive the second piston 5 to move downward.
The moving distance of the piston influences the contact degree of the rubber core and the drill rod, when the rubber core just contacts the drill rod, the sealing can be realized, and the loss of the rubber core is smaller; if the rubber core is excessively extruded, the loss of the rubber core is larger. The present embodiment provides the first diaphragm 131 and the second diaphragm 132, and the second diaphragm 132 functions as two for the first piston 4: the first is to form a sealed space to prevent oil leakage; the second is to limit the maximum movement distance of the first piston 4. For the second piston 5, the first diaphragm 131 functions as two: the first is to form a sealed space with the second partition 132 and the third partition 133 to prevent oil leakage; the second is to limit the maximum movement distance of the second piston 5.
The foregoing mentions that: when the lower layer of the well needs to be sealed, the baffle ring 6 extends out of the groove 111 to limit the upward movement of the spherical rubber core 2, and then the second piston 5 is started to enable the conical rubber core 3 to realize sealing. In this process, although the baffle ring 6 can block the spherical rubber core 2 at the outer side thereof, so as to prevent the spherical rubber core 2 from sealing, the upward movement of the second piston 5 may generate extrusion on the spherical rubber core 2, resulting in a certain degree of useless loss, so that the embodiment designs the adjusting plate 52 with a special structure on the top of the first flat section 5-1, and is used for reducing extrusion on the spherical rubber core 2 in the upward movement process of the second piston 5, specifically by the following steps:
the outer wall of the longitudinal section 5-2 is provided with a support plate 51 with an L-shaped section, the outer wall of the support plate 51 is attached to the first vertical surface 1-1, the top of the first flat section 5-1 is provided with a three-layer adjusting plate 52, the inner wall of the three-layer adjusting plate 52 and the inclined section 5-4 are positioned on the same surface, so that the lower part of the conical rubber core 3 is tightly attached to the inclined section 5-4, and the upper part of the conical rubber core is tightly attached to the adjusting plate 52. As shown in fig. 10, each layer includes ten adjusting plates 52, each adjusting plate 52 located at the top layer is connected to the supporting plate 51 through a telescopic assembly, which may be a hydraulically controlled telescopic rod, for sequentially expanding the three layers of adjusting plates 52 from top to bottom, wherein by sequentially expanding means: when the second piston 5 moves up, the top-most adjusting plate 52 is first unfolded, then the middle-layer adjusting plate 52 is unfolded, and finally the bottom-most adjusting plate 52 is unfolded, in this way, contact between the adjusting plate 52 and the spherical rubber core 2 can be avoided, and therefore extrusion of the adjusting plate 52 is reduced.
The manner in which the three-layer adjusting plate 52 is sequentially unfolded is as follows: first, one hydraulically controlled telescoping rod is provided outside each adjustment plate 52 of each layer, which has the disadvantage of requiring thirty telescoping rods. Second, the bottom adjusting plate 52 is slidably engaged with the first flat section 5-1 through a slider, and the remaining adjusting plates 52 are slidably engaged with the adjusting plates 52 located at the next layer through sliders, respectively. For example, the top-most layer and the middle-layer adjusting plate 52 are provided with a convex-shaped sliding block at the bottom of the top-most layer adjusting plate 52, the top of the middle-layer adjusting plate 52 is provided with a convex-shaped sliding groove, the convex-shaped sliding block is slidably matched in the convex-shaped sliding groove, when the telescopic rod is in an extended state, the convex-shaped sliding block is positioned at the innermost end of the convex-shaped sliding groove, at this time, the middle-layer adjusting plate 52 cannot move outwards at will because of being limited by the convex-shaped sliding block, and cannot move inwards at will because of being limited by the conical rubber core 3, so that the three-layer adjusting plate 52 is stable in structure. When the second piston 5 moves upwards and the telescopic rod gradually contracts, the top adjusting plate 52 moves outwards firstly, after the middle adjusting plate 52 loses restriction, the adjusting plate 52 moves outwards under the action of the convex-shaped sliding block, and similarly, after the bottom adjusting plate 52 loses restriction, the adjusting plate 52 also moves outwards under the action of the convex-shaped sliding block of the middle adjusting plate 52.
When the sealing of the conical rubber core 3 needs to be released, the hydraulic oil of the second lower oil port 152 is discharged, the hydraulic oil is injected into the second upper oil port 151 to drive the second piston 5 to move downwards, meanwhile, the telescopic rod is gradually extended, the topmost adjusting plate 52 is firstly moved inwards, then the middle adjusting plate 52 is moved inwards, and then the bottommost adjusting plate 52 is moved inwards.
The lower portion of the interior of the main body 12 has a small space and the upper portion has a large space, specifically, a large cylindrical area, so as to allow enough space for the three-layer regulator plate 52 to be deployed. First case: when the lower layer of the well is sealed, the second piston 5 is started; second case: when both the upper and lower layers of the well are to be sealed, the first piston 4 and the second piston 5 are activated, i.e. the second piston 5 in the second case needs to be moved up higher than in the first case to achieve sealing of the cone-shaped core 3. Therefore, in order to take a larger space for the second case, so as to ensure that the three-layer adjusting plate 52 is unfolded smoothly, as shown in fig. 7, a circle of avoiding grooves 112 are formed in the bottom of the top cover 11, the avoiding grooves 112 are located on the outer side of the arc-shaped inner wall, and as shown in fig. 1, a circle of notches 21 are formed in the periphery of the bottom of the spherical rubber core 2.
In summary, in this embodiment, the first piston 4 may be used to realize single-layer sealing, or the second piston 5 may be used to realize single-layer sealing, or the first piston 4 and the second piston 5 may be used to realize double-layer sealing at the same time, so that the safety is higher.
The above embodiments are merely for illustrating the technical ideas and features of the present invention, and are not meant to be exclusive or limiting. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.
Claims (7)
1. The double-rubber-core composite annular blowout preventer is characterized by comprising a top cover (11), a main body (12), a baffle ring (6), and a spherical rubber core (2), a conical rubber core (3), a first piston (4) and a second piston (5) which are arranged in the main body (12);
the top cover (11) covers the top of the main body (12), and a circle of grooves (111) are formed in the arc-shaped inner wall of the top cover (11);
the spherical rubber core (2) is matched in the top cover (11), and the conical rubber core (3) is arranged below the spherical rubber core (2);
the first piston (4) is arranged below the conical rubber core (3) and is used for enabling the spherical rubber core (2) and the conical rubber core (3) to move up and down;
the second piston (5) is arranged on the periphery of the conical rubber core (3) and is used for closing the conical rubber core (3);
the baffle ring (6) is in sliding fit in the groove (111) under the action of the power source, and when the baffle ring (6) is retracted into the groove (111), the bottom of the baffle ring and the inner wall of the top cover (11) form a complete arc surface; when the baffle ring (6) extends out of the groove (111), the baffle ring is used for limiting the upward movement of the spherical rubber core (2);
the main body (12) sequentially comprises a first vertical surface (1-1), an inclined surface (1-2), a second vertical surface (1-3), a first transverse surface (1-4), a third vertical surface (1-5) and a second transverse surface (1-6) from top to bottom, wherein the third vertical surface (1-5) is vertically downwards arranged from the first transverse surface (1-4) and extends upwards, the second transverse surface (1-6) faces the outer side direction of the blowout preventer, an annular area is formed among the second vertical surface (1-3), the first transverse surface (1-4) and the third vertical surface (1-5), an inverted cone area is formed inside the inclined surface (1-2), and a cylindrical area is formed inside the first vertical surface (1-1);
the annular region is internally provided with a first baffle plate (131) and a second baffle plate (132) positioned below the annular region, the outer walls of the first baffle plate (131) and the second baffle plate (132) are connected to the second vertical surface (1-3), and the width of the first baffle plate (131) is smaller than that of the second baffle plate (132);
the top of the second partition plate (132) is vertically provided with a third partition plate (133), the cross section of the second piston (5) is Z-shaped, the second piston sequentially comprises a first flat section (5-1) attached to the second partition plate (132), a longitudinal section (5-2) attached to the third partition plate (133), a second flat section (5-3) attached to the top of the third partition plate (133), an inclined section (5-4) inclined downwards towards the inside of the blowout preventer, the conical rubber core (3) is matched with the inclined section (5-4), and the inner wall of the first partition plate (131) is attached to the longitudinal section (5-2).
2. The dual-core composite annular blowout preventer of claim 1, wherein the cross section of the first piston (4) is Z-shaped, comprising in order a first transverse section (4-1) attached to the first transverse surface (1-4), a vertical section (4-2) attached to the third vertical surface (1-5), a second transverse section (4-3) attached to the top of the third vertical surface (1-5), the inner wall of the second partition (132) attached to the third vertical surface (1-5), and the conical rubber core (3) is disposed on the second transverse section (4-3).
3. The double-rubber-core composite annular blowout preventer according to claim 1, wherein the second vertical surface (1-3) is provided with a second oil inlet (151), a second oil outlet (152), a first oil inlet (141) and a first oil outlet (142) in sequence from top to bottom, the first oil inlet (141) and the first oil outlet (142) are used for regulating and controlling the first piston (4), and the second oil inlet (151) and the second oil outlet (152) are used for regulating and controlling the second piston (5).
4. The dual-rubber-core composite annular blowout preventer according to claim 1, wherein the outer wall of the longitudinal section (5-2) is provided with a supporting plate (51) with an L-shaped cross section, the outer wall of the supporting plate (51) is attached to the first vertical surface (1-1), the top of the first flat section (5-1) is provided with a plurality of regulating plates (52), each layer comprises a plurality of regulating plates (52), each regulating plate (52) located on the top layer is connected to the supporting plate (51) through a telescopic assembly, the telescopic assembly is used for sequentially expanding the plurality of regulating plates (52) from top to bottom, and the conical rubber core (3) is matched with the regulating plates (52).
5. The dual-core composite annular blowout preventer of claim 4, wherein the bottom-most adjusting plate (52) is slidably fitted to the first flat section (5-1) by means of a slider, and the remaining adjusting plates (52) of each layer are slidably fitted to the adjusting plates (52) of the next layer thereof by means of a slider, respectively.
6. The double-rubber-core composite annular blowout preventer according to claim 4 or 5, wherein the bottom of the top cover (11) is provided with a circle of avoidance grooves (112), the avoidance grooves (112) are positioned on the outer side of the arc-shaped inner wall, and the periphery of the bottom of the spherical rubber core (2) is provided with a circle of notches (21).
7. The dual-rubber-core composite annular blowout preventer of claim 1, wherein the spherical rubber core (2) is uniformly provided with first supporting ribs, the conical rubber core (3) is uniformly provided with second supporting ribs, and the first supporting ribs and the second supporting ribs are arranged in a vertically crossing manner.
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| CN202310159953.1A CN115898319B (en) | 2023-02-24 | 2023-02-24 | Double-rubber-core composite annular blowout preventer |
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| CN202310159953.1A CN115898319B (en) | 2023-02-24 | 2023-02-24 | Double-rubber-core composite annular blowout preventer |
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| CN115898319B true CN115898319B (en) | 2023-05-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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