CN114396241B - Double-layer sealed spherical rubber core and annular blowout preventer - Google Patents
Double-layer sealed spherical rubber core and annular blowout preventer Download PDFInfo
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- CN114396241B CN114396241B CN202210309324.8A CN202210309324A CN114396241B CN 114396241 B CN114396241 B CN 114396241B CN 202210309324 A CN202210309324 A CN 202210309324A CN 114396241 B CN114396241 B CN 114396241B
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- 238000007789 sealing Methods 0.000 claims abstract description 75
- 230000000712 assembly Effects 0.000 claims abstract description 12
- 238000000429 assembly Methods 0.000 claims abstract description 12
- 238000005553 drilling Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sealing Devices (AREA)
- Gasket Seals (AREA)
Abstract
The invention discloses a double-layer sealed spherical rubber core and an annular blowout preventer. The spherical rubber core body comprises an annular base plate and a plurality of rubber teeth which are circumferentially arranged at the top of the annular base plate; the supporting ribs are arranged between the two rubber teeth at intervals, and the bottoms of the supporting ribs are connected to the annular chassis through spring assemblies; the pushing mechanism comprises a plurality of sealing heads and a plurality of pushing assemblies, the sealing heads and the pushing assemblies are connected through connecting rods, the sealing heads are uniformly distributed along the inner wall of the annular chassis, the pushing assemblies are located on the outer side of the annular chassis, the connecting rods are in sliding fit in the annular chassis, the spherical rubber cores are pushed by the pistons and can move inwards through the connecting rods when moving upwards, and the sealing heads are gathered on the drill rod. The connection stability of the support ribs is improved, the support ribs are prevented from falling into the well, and meanwhile, the support ribs can be quickly returned; the double-layer sealing structure is arranged, and the sealing effect of the spherical rubber core is improved.
Description
Technical Field
The invention relates to the technical field of blowout preventers, in particular to a double-layer sealed spherical rubber core and an annular blowout preventer.
Background
The annular blowout preventer operates to form a sealed annular space between the tubular string and the wellbore. In field work, a group of blowout preventers are often needed, after the annular blowout preventer with the spherical rubber core is used, if the spherical rubber core is not returned timely, a drill rod starts to trip down, the spherical rubber core and the support rib can be separated, rubber materials of the spherical rubber core can be brought out by circulating fluid when falling into a well, the support rib cannot be brought out by the circulating fluid when falling into the well, fishing is not good, and if the support rib cannot be fished out, drilling cannot be continued, so that loss is serious; in addition, after the top of the spherical rubber core is gathered, a sealing ring is formed on the drill rod, however, when the spherical rubber core cannot be gathered or the sealing effect is poor, the prior art lacks a standby scheme, only the spherical rubber core can be maintained or replaced, and the working speed is delayed.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a double-layer sealed spherical rubber core and an annular blowout preventer, wherein in the spherical rubber core, the connection stability of a support rib is increased, the support rib is prevented from falling into a well, and meanwhile, the support rib can be quickly returned; the double-layer sealing structure is arranged, and the sealing effect of the spherical rubber core is improved.
In order to realize the purpose of the invention, the following scheme is adopted:
a double-layer sealed spherical rubber core is arranged in an annular blowout preventer and comprises a spherical rubber core body, a pushing mechanism and a plurality of supporting ribs.
The spherical rubber core body comprises an annular base plate and a plurality of rubber teeth which are circumferentially arranged at the top of the annular base plate;
the supporting ribs are arranged between the two rubber teeth at intervals, and the bottoms of the supporting ribs are connected to the annular chassis through spring assemblies;
the pushing mechanism comprises a plurality of sealing heads and a plurality of pushing assemblies, the sealing heads and the pushing assemblies are connected through connecting rods, the sealing heads are uniformly distributed along the inner wall of the annular chassis, the pushing assemblies are located on the outer side of the annular chassis, the connecting rods are in sliding fit in the annular chassis, the spherical rubber cores are pushed by the pistons and can move inwards through the connecting rods when moving upwards, and the sealing heads are gathered on the drill rod.
Further, promote the subassembly and include the seal box and be located montant, the down tube in the seal box, seal box fixed connection is in annular chassis, in the connecting rod extends to the seal box, connecting rod and seal box wall sliding fit, on the connecting rod was located to the down tube slope, and the low side of down tube towards spherical gluey core body setting, be equipped with the chute on the montant, down tube sliding fit is in the chute, outside the montant bottom extended to the seal box, be used for connecting the piston, montant and seal box sliding fit.
Furthermore, a limit groove is arranged in the sealing box, and the top of the vertical rod is in sliding fit with the limit groove.
Furthermore, the spring assembly comprises a spring and screws located at two ends of the spring, the thread directions of the two screws are opposite, a plurality of assembling grooves are formed in the outer wall of the annular base plate, the spring is located in the assembling grooves, and the two screws are connected with the annular base plate and the supporting ribs respectively.
Furthermore, the connecting rod and the sealing box are positioned between the two rubber teeth, and the size is based on the condition that the outer wall of each rubber tooth is allowed to be tightly attached to the top cover of the annular blowout preventer.
Furthermore, the periphery of the sealing head is positioned in the annular chassis, the sealing head is in sliding fit with the annular chassis along with the connecting rod, and when the sealing heads are gathered on the drill rod, a closed circle is formed.
The annular blowout preventer comprises a bottom shell, a top cover and the double-layer sealed spherical rubber core, wherein a piston is arranged in the bottom shell, and the spherical rubber core is positioned in the top cover.
Furthermore, a plurality of sliding grooves are formed in the same positions of the inner walls of the top cover and the bottom shell, and the sealing box is in up-and-down sliding fit with the sliding grooves.
Furthermore, a plurality of pneumatic lifting rods are arranged on the piston, the piston is used for moving the spherical rubber core up and down, and the pneumatic lifting rods are used for moving the vertical rods up and down.
The invention has the beneficial effects that:
1. the rubber teeth and the supporting ribs on the top of the spherical rubber core with the double-layer sealing structure are gathered to form a first layer of seal, and the sealing heads at the bottom of the spherical rubber core are gathered to form a second layer of seal, so that the double-layer sealing structure can effectively solve the problems that the rubber teeth and the supporting ribs cannot be sealed or the sealing effect is poor; may also be used as an alternative, or both; when sealing drill rods with different specifications, the rubber core can be used for sealing at different positions.
2. The brace rod bottom is connected in the annular chassis through spring assembly, spring assembly includes the spring, connect in the screw at spring both ends, at the in-process of spherical gluey core return, spring assembly can pull back the brace rod normal position fast, can also prevent it from falling into the well, and during the equipment brace rod, insert the threaded hole of assembly tank bottom portion earlier with spring assembly one end, then place the brace rod on spring assembly, then rotate the spring, because the screw thread opposite direction of two screws, so can twist into on brace rod and the annular chassis two screws simultaneously, the equipment is convenient and stable in structure.
3. According to the invention, acting force in the vertical direction is skillfully converted into horizontal acting force, and when the vertical rod moves upwards, the connecting rod can only move towards the spherical rubber core in the horizontal direction due to the limit and sliding fit of the inclined rod and the inclined groove, so that the three sealing heads are gathered together to realize sealing.
Drawings
FIG. 1 is a schematic view of a spherical rubber core of example 1;
FIG. 2 is a top view of the spherical rubber core of example 1;
FIG. 3 is a structural view of a pushing mechanism of embodiment 1;
FIG. 4 is a view showing the structure of the spherical rubber core body in example 1;
FIG. 5 is a structural view of a spring assembly of embodiment 1;
FIG. 6 is a configuration view of the annular blowout preventer of embodiment 2;
FIG. 7 is an internal structure view of the annular blowout preventer of embodiment 2;
FIG. 8 is a cross-sectional view of the annular blowout preventer of embodiment 2;
reference numerals: the pneumatic rubber core comprises a spherical rubber core body-1, a pushing mechanism-2, a supporting rib-3, an annular chassis-11, rubber teeth-12, a spring component-4, a sealing head-21, a pushing component-22, a connecting rod-23, a piston-5, a sealing box-221, a vertical rod-222, an inclined rod-223, an inclined groove-224, a limiting groove-225, a spring-41, a screw-42, an assembly groove-13, a bottom shell-7, a top cover-6, a sliding groove-61 and a pneumatic lifting rod-51.
Detailed Description
Example 1
As shown in fig. 1, 2, 3, 4, and 5, the present embodiment provides a double-seal spherical rubber core, which is disposed in an annular blowout preventer and includes a spherical rubber core body 1, a pushing mechanism 2, and a plurality of support ribs 3.
Specifically, the spherical rubber core body 1 is in a lotus seat shape and comprises an annular chassis 11 and a plurality of rubber teeth 12 arranged on the top of the annular chassis 11 in a circumferential mode, the annular chassis 11 can be made of metal, and the rubber teeth 12 are made of rubber.
Specifically, there is the clearance between two adjacent rubber teeth 12, and brace rod 3 separates between two rubber teeth 12, and 3 bottoms of brace rod are connected in annular chassis 11 through spring unit 4, and at the in-process of spherical rubber core return, spring unit 4 can pull back the home position fast with brace rod 3, can also prevent that it from falling into the well.
Specifically, the pushing mechanism 2 comprises a plurality of sealing heads 21 and a plurality of pushing assemblies 22, the sealing heads 21 and the pushing assemblies 22 are connected through a connecting rod 23, the sealing heads 21 are uniformly distributed along the inner wall of the annular chassis 11, the pushing assemblies 22 are positioned on the outer side of the annular chassis 11, the connecting rod 23 is in sliding fit with the annular chassis 11, the spherical rubber core moves upwards under the pushing of the piston 5, and when the spherical rubber core reaches the highest point, the connecting rod 23 moves inwards, so that the sealing heads 21 are gathered together in the drill rod.
That is to say, the rubber teeth 12 and the supporting ribs 3 at the top of the spherical rubber core are gathered to form a first layer of seal, the sealing heads 21 at the bottom of the spherical rubber core are gathered to form a second layer of seal, and the double-layer sealing structure can effectively solve the problems that the rubber teeth 12 and the supporting ribs 3 cannot be sealed or the sealing effect is poor; may be used as an alternative, or both; when sealing drill rods with different specifications, the rubber core can be used for sealing at different positions.
More specifically, in the embodiment, three sealing heads 21 are provided, the periphery of the sealing head 21 is positioned in the annular chassis 11, and the sealing head 21 is in sliding fit with the annular chassis 11 along with the connecting rod 23, so that when the three sealing heads 21 are gathered together with the drill rod, a closed circle is formed.
More specifically, the pushing assembly 22 includes a sealing box 221, a vertical rod 222 and a diagonal rod 223, the vertical rod 222 and the diagonal rod 223 are located in the sealing box 221, the sealing box 221 is fixedly connected to the outer wall of the annular chassis 11, the connecting rod 23 extends into the sealing box 221, the connecting rod 23 is in sliding fit with the wall of the sealing box 221, the diagonal rod 223 is obliquely and fixedly disposed on the connecting rod 23, the lower end of the diagonal rod 223 is disposed toward the spherical rubber core body 1, the vertical rod 222 is provided with an inclined groove 224, the diagonal rod 223 is in sliding fit with the inclined groove 224, the bottom of the vertical rod 222 extends out of the sealing box 221 and is used for connecting the piston 5, and the vertical rod 222 is in sliding fit with the sealing box 221.
That is, when the vertical rod 222 moves upward, because the inclined rod 223 is in a limit and sliding fit with the inclined groove 224, the connecting rod 23 can only move in the horizontal direction towards the spherical rubber core, so that the three sealing heads 21 are gathered to realize sealing.
In order to further improve the moving stability of the vertical rod 222, a limiting groove 225 is formed in the sealing box 221, and the top of the vertical rod 222 is slidably fitted in the limiting groove 225.
More specifically, the spring assembly 4 comprises a spring 41 and screws 42 connected to two ends of the spring 41, the thread directions of the two screws 42 are opposite, a plurality of assembling grooves 13 are formed in the outer wall of the annular chassis 11, the tops of the assembling grooves 13 are communicated with the outside, the spring 41 is located in the assembling grooves 13, and the two screws 42 are respectively connected with the annular chassis 11 and the support rib 3.
When assembling the brace rod 3, insert the threaded hole of the bottom of the assembly groove 13 with one end of the spring assembly 4, then place the brace rod 3 on the spring assembly 4, need the assistance of gadget this moment, because the outer wall of the assembly groove 13 also communicates with the outside, insert the gadget from the outer wall of the assembly groove 13, then rotate the spring 41, because the screw direction of two screws 42 is opposite, so can screw in two screws 42 on the brace rod 3 and the annular chassis 11 simultaneously.
More specifically, when the rubber teeth 12 and the supporting rib 3 move up and down along the inner wall of the annular blowout preventer, in order to prevent the sealing box 221 from affecting the gathering and sealing effects of the rubber teeth 12 and the supporting rib 3, as shown in fig. 2, the connecting rod 23 and the sealing box 221 are located between the two rubber teeth 12, and the size is determined to allow the outer wall of the rubber teeth 12 to be closely attached to the top cover 6 of the annular blowout preventer.
Example 2
As shown in fig. 6, 7 and 8, the present embodiment provides an annular blowout preventer, which includes a bottom shell 7, a top cover 6 and the double-layer sealing type spherical rubber core in embodiment 1, wherein the piston 5 is located in the bottom shell 7, and the spherical rubber core is located in the top cover 6.
More specifically, in order to ensure that the support rib 3 moves up and down along the inner wall of the annular blowout preventer in a clinging manner, a plurality of sliding grooves 61 are formed in the same positions of the inner walls of the top cover 6 and the bottom shell 7, and the seal box 221 is in up-and-down sliding fit with the sliding grooves 61.
More specifically, a plurality of pneumatic lifting rods 51 are arranged on the piston 5, the piston 5 is used for moving the spherical rubber core up and down, and the pneumatic lifting rods 51 are used for moving the vertical rods 222 up and down.
When sealing a drill rod with the present embodiment, the first case is: the spherical rubber core body 1 and the pushing mechanism 2 are moved upwards by the piston 5 at the same time, and the rubber teeth 12 and the supporting ribs 3 are gathered, so that the drill rod is sealed; the second case is: the pneumatic lifting rod 51 is directly lifted, so that the sealing head 21 is gathered to realize sealing; the third case is: firstly, the spherical rubber core body 1 and the pushing mechanism 2 are moved upwards simultaneously by the piston 5, when the highest point is reached, the first layer of sealing is finished, then the pneumatic lifting rod 51 is lifted, the sealing head 21 is gathered, and double-layer sealing is realized.
The above embodiments are only for illustrating the technical ideas and features of the present invention, and are not meant to be exclusive or limiting of the present invention. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention.
Claims (9)
1. A double-layer sealed spherical rubber core is characterized in that the double-layer sealed spherical rubber core is arranged in an annular blowout preventer and comprises a spherical rubber core body (1), a pushing mechanism (2) and a plurality of supporting ribs (3);
the spherical rubber core body (1) comprises an annular chassis (11) and a plurality of rubber teeth (12) which are circumferentially arranged on the top of the annular chassis (11);
the supporting ribs (3) are arranged between the two rubber teeth (12) at intervals, and the bottoms of the supporting ribs (3) are connected to the annular chassis (11) through spring assemblies (4);
push mechanism (2) include a plurality of sealed heads (21) and a plurality of pushing assembly (22), connect through connecting rod (23) between sealed head (21) and the pushing assembly (22), a plurality of sealed heads (21) are along annular chassis (11) inner wall evenly distributed, pushing assembly (22) are located annular chassis (11) outside, connecting rod (23) sliding fit is in annular chassis (11), when the spherical rubber core upwards moves under piston (5) promotes, make connecting rod (23) move inwards, connecting rod (23) move inwards makes a plurality of sealed heads (21) gather together in the drilling rod.
2. The double-layer sealing type spherical rubber core according to claim 1, wherein the pushing assembly (22) comprises a sealing box (221), a vertical rod (222) and an inclined rod (223) which are located in the sealing box (221), the sealing box (221) is fixedly connected to the annular chassis (11), the connecting rod (23) extends into the sealing box (221), the connecting rod (23) is in sliding fit with the wall of the sealing box (221), the inclined rod (223) is obliquely arranged on the connecting rod (23), the lower end of the inclined rod (223) faces the spherical rubber core body (1), an inclined groove (224) is formed in the vertical rod (222), the inclined rod (223) is in sliding fit with the inclined groove (224), the bottom of the vertical rod (222) extends out of the sealing box (221) and is used for connecting the piston (5), and the vertical rod (222) is in sliding fit with the sealing box (221).
3. The double-layer sealed spherical rubber core according to claim 2, wherein a limiting groove (225) is formed in the sealing box (221), and the top of the vertical rod (222) is slidably fitted in the limiting groove (225).
4. The double-layer sealed spherical rubber core according to claim 1, wherein the spring assembly (4) comprises a spring (41) and screws (42) arranged at two ends of the spring (41), the two screws (42) have opposite thread directions, a plurality of assembling grooves (13) are formed in the outer wall of the annular base plate (11), the spring (41) is arranged in the assembling grooves (13), and the two screws (42) are respectively connected with the annular base plate (11) and the supporting ribs (3).
5. The double-seal spherical rubber core according to claim 2, wherein the connecting rod (23) and the seal box (221) are positioned between the two rubber teeth (12) and have dimensions such as to allow the outer wall of the rubber teeth (12) to be tightly attached to the top cover (6) of the annular blowout preventer.
6. The double-layer sealed spherical rubber core according to claim 1, wherein the sealing head (21) is peripherally located in the annular base plate (11), and the sealing head (21) is slidably engaged with the annular base plate (11) along with the connecting rod (23) to form a closed circle when the plurality of sealing heads (21) are gathered together with the drill pipe.
7. An annular blowout preventer, characterized by, including drain pan (7), top cap (6) and as in any one of claims 2~6 two-layer canned type spherical rubber core, be equipped with piston (5) in drain pan (7), spherical rubber core is located top cap (6).
8. The annular blowout preventer according to claim 7, wherein the top cover (6) and the bottom shell (7) are provided with a plurality of sliding grooves (61) at the same positions on the inner walls, and the seal box (221) is in up-and-down sliding fit with the sliding grooves (61).
9. The annular blowout preventer according to claim 7, wherein the piston (5) is provided with a plurality of pneumatic lifting rods (51), the piston (5) is used for moving the spherical rubber core up and down, and the pneumatic lifting rods (51) are used for moving the vertical rods (222) up and down.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210309324.8A CN114396241B (en) | 2022-03-28 | 2022-03-28 | Double-layer sealed spherical rubber core and annular blowout preventer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210309324.8A CN114396241B (en) | 2022-03-28 | 2022-03-28 | Double-layer sealed spherical rubber core and annular blowout preventer |
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| CN114396241A CN114396241A (en) | 2022-04-26 |
| CN114396241B true CN114396241B (en) | 2022-06-10 |
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| CN115898319B (en) * | 2023-02-24 | 2023-05-09 | 四川新为橡塑有限公司 | Double-rubber-core composite annular blowout preventer |
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