CN112963121A - Blowout prevention check valve - Google Patents
Blowout prevention check valve Download PDFInfo
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- CN112963121A CN112963121A CN202110144343.5A CN202110144343A CN112963121A CN 112963121 A CN112963121 A CN 112963121A CN 202110144343 A CN202110144343 A CN 202110144343A CN 112963121 A CN112963121 A CN 112963121A
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- 230000002265 prevention Effects 0.000 title claims abstract description 41
- 238000007789 sealing Methods 0.000 claims abstract description 110
- 230000002093 peripheral effect Effects 0.000 claims abstract description 43
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 41
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
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- Check Valves (AREA)
Abstract
The utility model provides a prevent spouting check valve belongs to oil recovery technical field. Comprises a valve body, a supporting seat, a valve core and an elastic piece; the valve body is a cylindrical structural member with two open ends and a hollow interior; the supporting seat is positioned in the valve body, the outer edge of the supporting seat is connected with the inner wall of the valve body so as to divide the inner space of the valve body into a first space and a second space, and the supporting seat is provided with an overflowing hole which is communicated with the first space and the second space; the valve core comprises a valve rod and a core body, the valve rod is slidably inserted in the supporting seat, the first end of the valve rod is located in the first space and is connected with one part of the elastic piece, the other part of the elastic piece abuts against the supporting seat, the second end of the valve rod extends towards the second end of the valve body and is connected with the core body, the outer sealing conical surface is arranged at the position, close to the valve rod, of the outer peripheral wall of the core body, the outer sealing conical surface extends along the circumferential direction of the core body, and the outer sealing conical surface is used for being in sealing contact with the second. The sealing performance and the reliability of the blowout prevention check valve can be improved.
Description
Technical Field
The utility model belongs to the technical field of oil recovery, in particular to prevent spouting check valve.
Background
In the well repairing process, due to the fact that pressure in the well is unbalanced, well liquid can return out of the pipe column, and environmental pollution is caused.
To address this problem, blowout prevention check valves are typically installed on the pipe string. In the related art, the blow-out prevention check valve has substantially the same structure as a conventional check valve, and the closing or opening of the passage is achieved by the contact and the spacing between the spool and the valve body.
However, the blowout-preventing check valve with the structure has poor sealing effect on gas because the well fluid is accompanied by gas in the process of returning the well fluid out of the pipe column, so that the gas can easily bring the well fluid out of the pipe column, and the environment pollution is caused.
Disclosure of Invention
The embodiment of the disclosure provides a blowout prevention check valve, which can improve the sealing performance and reliability of the blowout prevention check valve. The technical scheme is as follows:
the embodiment of the disclosure provides a blowout prevention check valve, which comprises a valve body, a supporting seat, a valve core and an elastic piece;
the supporting seat is positioned in the valve body, the outer edge of the supporting seat is connected with the inner wall of the valve body so as to divide the inner space of the valve body into a first space and a second space, the first space is close to the first end of the valve body, the second space is close to the second end of the valve body, the supporting seat is provided with an overflowing hole, and the overflowing hole is communicated with the first space and the second space;
the valve core comprises a valve rod and a core body, the valve rod is slidably inserted in the supporting seat, the first end of the valve rod is located in the first space and is connected with one part of the elastic piece, the other part of the elastic piece abuts against the supporting seat, the second end of the valve rod extends towards the second end of the valve body and is connected with the core body, the core body is a cylindrical structural piece, the outer peripheral wall of the core body is close to the position of the valve rod and is provided with an outer sealing conical surface, the outer sealing conical surface extends along the circumferential direction of the core body, the outer diameter of the outer sealing conical surface gradually increases along the direction deviating from the valve rod, and the outer sealing conical surface is used for being in sealing contact with the second end of the valve body.
In one implementation of the present disclosure, the valve body includes a barrel and an inner flange;
the inner flange is positioned in the cylinder, the outer peripheral wall of the inner flange is connected with the inner peripheral wall of the cylinder, the first end of the inner flange is close to the first end of the cylinder, an inner sealing conical surface is arranged at the position, close to the first end, of the inner peripheral wall of the inner flange, the inner sealing conical surface extends along the circumferential direction of the inner flange, and the inner sealing conical surface is matched with the outer sealing conical surface.
In another implementation manner of the present disclosure, a first seal ring is disposed on an inner circumferential wall of the inner flange, the first seal ring is coaxial with the inner flange and located between the first end and the second end of the inner flange, and the first seal ring is configured to be clamped between the inner circumferential wall of the inner flange and the outer circumferential wall of the core body.
In another implementation manner of the present disclosure, the inner circumferential wall of the inner flange has two first sealing rings, and the two first sealing rings are sequentially arranged at intervals along the axial direction of the inner flange.
In another implementation manner of the present disclosure, a second sealing ring is disposed on the outer peripheral wall of the core body, the second sealing ring is coaxial with the core body and located at an end of the core body away from the valve rod, and the second sealing ring is configured to be clamped between the outer peripheral wall of the core body and the inner peripheral wall of the inner flange.
In another implementation manner of the present disclosure, the inner circumferential wall of the cylinder has an annular groove, the annular groove is coaxial with the cylinder, the supporting seat is a circular plate-shaped structural member, and the outer edge of the supporting seat is tightly embedded in the annular groove.
In still another implementation of the present disclosure, the inner circumferential wall of the cylinder has an internal thread at a position near the first end, and the outer circumferential wall of the cylinder has an external thread at a position near the second end, the internal thread and the external thread each extending in an axial direction of the cylinder.
In another implementation manner of the present disclosure, the valve element further includes a limiting member, the limiting member is connected to the first end of the valve rod, an outer edge of the limiting member protrudes out of an outer peripheral wall of the valve rod, and the elastic member is clamped between the limiting member and the supporting seat.
In another implementation manner of the present disclosure, the limiting member is a nut, and the limiting member is in threaded fit with the valve stem.
In another implementation manner of the present disclosure, the elastic member is a spring, the elastic member is sleeved outside the valve rod, one end of the elastic member abuts against the limiting member, and the other end of the elastic member abuts against the supporting seat.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
when the blowout prevention check valve provided by the embodiment of the disclosure is installed on a tubular column, the first end of the valve body is connected with an oil pipe above the valve body, and the second end of the valve body is connected with an oil pipe below the valve body, so that the blowout prevention check valve can be positioned between the two oil pipes. When no well fluid circulates in the blowout prevention check valve, the elastic piece is in a compression state, an acting force towards the first end of the valve body is applied to the valve rod, and under the influence of the acting force, the valve rod can enable the core body to always have a trend towards the first end of the valve body to move, so that the outer sealing conical surface on the core body is tightly pressed on the second end of the valve body, and reliable sealing is further achieved.
When well fluid flows from the second end to the first end of the valve body in the blowout prevention check valve, namely the well fluid returns from the oil pipe below to the oil pipe above, one end of the core body, which is far away from the valve rod, is under the pressure of the well fluid, and the core body has a tendency of moving towards the first end of the valve body, so that the outer sealing conical surface on the core body is more tightly pressed against the second end of the valve body, and reliable sealing is further realized.
When well fluid flows from the first end to the second end of the valve body in the blowout prevention check valve, namely the well fluid flows from the upper oil pipe to the lower oil pipe, the well fluid firstly enters the first space and enters the second space through the overflowing hole. The well liquid that gets into the second space will exert the effort to the core one end that is close to the valve rod, and when this effort was greater than the elasticity of elastic component, the core will remove towards the second end of valve body for produce the clearance between the second end of external sealing conical surface and valve body, well liquid can flow out the valve body from this clearance, finally get into in the oil pipe of below, thereby realize the normal circulation of well liquid.
Therefore, after the blowout-preventing check valve provided by the embodiment of the disclosure is connected between two adjacent oil pipes, the outer sealing conical surface on the core body can tightly abut against the second end of the valve body through the cooperation of the elastic piece, the supporting seat and the valve rod, so that reliable sealing is realized. And when well fluid is to be returned, the outer sealing conical surface can further abut against the second end of the valve body under the action of the well fluid, so that the sealing performance of the blowout-preventing check valve is further improved, and the well fluid is effectively prevented from being returned.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of an internal structure of a blowout prevention single flow valve in an open state provided by an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an internal structure of a blowout prevention check valve in a closed state according to an embodiment of the disclosure.
The symbols in the drawings represent the following meanings:
1. a valve body; 11. a barrel; 111. an annular groove; 12. an inner flange; 121. an inner sealing conical surface;
2. a supporting seat; 21. an overflowing hole;
3. a valve core; 31. a valve stem; 32. a core body; 321. an outer sealing conical surface; 33. a limiting member;
4. an elastic member;
5. a first seal ring;
6. a second seal ring;
A. a first space; B. a second space.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Workover is an important part of the operations in oil production. In the well repairing process, due to the fact that pressure in the well is unbalanced, well liquid can return out of the pipe column, and environmental pollution is caused.
To address this problem, blowout prevention check valves are typically installed on the pipe string. In the related art, the blow-out prevention check valve has substantially the same structure as a conventional check valve, and the closing or opening of the passage is achieved by the contact and the spacing between the spool and the valve body.
However, the blowout-preventing check valve with the structure has poor sealing effect on gas because the well fluid is accompanied by gas in the process of returning the well fluid out of the pipe column, so that the gas can easily bring the well fluid out of the pipe column, and the environment pollution is caused.
In order to solve the technical problem, the embodiment of the present disclosure provides a check blowout preventer, and fig. 1 is a schematic internal structural view of a opened state of the check blowout preventer, as shown in fig. 1, the check blowout preventer comprises a valve body 1, a support seat 2, a valve core 3 and an elastic member 4.
The valve body 1 is a cylindrical structural member with two open ends and hollow inside, and the first end and the second end of the valve body 1 are used for respectively communicating two adjacent oil pipes. The supporting seat 2 is located the valve body 1, and the outward flange of supporting seat 2 links to each other with the inner wall of valve body 1 to separate the inner space of valve body 1 for first space A and second space B, first space A is close to the first end of valve body 1, and second space B is close to the second end of valve body 1, has overflowing hole 21 on the supporting seat 2, and overflowing hole 21 communicates first space A and second space B. The valve core 3 includes a valve rod 31 and a core body 32, the valve rod 31 is slidably inserted in the support seat 2, a first end of the valve rod 31 is located in the first space a and is connected with a portion of the elastic member 4, another portion of the elastic member 4 abuts against the support seat 2, a second end of the valve rod 31 extends towards a second end of the valve body 1 and is connected with the core body 32, the core body 32 is a cylindrical structural member, an outer sealing conical surface 321 is arranged at a position, close to the valve rod 31, of the outer peripheral wall of the core body 32, the outer sealing conical surface 321 extends along the circumferential direction of the core body 32, the outer diameter of the outer sealing conical surface 321 gradually increases along a direction departing from the valve rod 31, and the outer sealing conical surface 321 is used.
Fig. 2 is a schematic diagram of an internal structure of the blowout prevention check valve in a closed state, and referring to fig. 2, when the blowout prevention check valve provided by the embodiment of the present disclosure is installed on a pipe string, a first end of the valve body 1 is connected to an upper oil pipe, and a second end of the valve body 1 is connected to a lower oil pipe, so that the blowout prevention check valve can be located between the two oil pipes. When no well fluid flows in the blowout prevention check valve, the elastic element 4 is in a compressed state, an acting force towards the first end of the valve body 1 is applied to the valve rod 31, and under the influence of the acting force, the valve rod 31 can enable the core body 32 to always have a trend of moving towards the first end of the valve body 1, so that the outer sealing conical surface 321 on the core body 32 is tightly pressed against the second end of the valve body 1, and reliable sealing is further realized.
With continued reference to fig. 2, when well fluid flows from the second end to the first end of the valve body 1 in the blowout-preventing check valve, that is, when the well fluid returns from the oil pipe below to the oil pipe above, the end of the core body 32 away from the valve rod 31 will receive the pressure of the well fluid, and the core body 32 has a tendency to move toward the first end of the valve body 1, so that the outer sealing conical surface 321 on the core body 32 is more tightly pressed against the second end of the valve body 1, thereby achieving reliable sealing.
Referring to fig. 1, when well fluid flows from the first end to the second end of the check blowout preventer 1, that is, when well fluid flows from the upper oil pipe to the lower oil pipe, the well fluid first enters the first space a and enters the second space B through the overflowing hole 21. The well fluid entering the second space B applies an acting force to one end of the core body 32 close to the valve rod 31, and when the acting force is greater than the elastic force of the elastic member 4, the core body 32 moves towards the second end of the valve body 1, so that a gap is generated between the outer sealing conical surface 321 and the second end of the valve body 1, and the well fluid can flow out of the valve body 1 through the gap and finally enter an oil pipe below the valve body, thereby realizing the normal circulation of the well fluid.
Therefore, the blowout prevention check valve provided by the embodiment of the disclosure can enable the outer sealing conical surface 321 on the core 32 to be tightly pressed against the second end of the valve body 1 through the cooperation of the elastic member 4, the supporting seat 2 and the valve rod 31 after being connected between two adjacent oil pipes, so as to achieve reliable sealing. In addition, when well fluid is to be returned, the outer sealing conical surface 321 can further abut against the second end of the valve body 1 under the action of the well fluid, so that the sealing performance of the blowout-preventing check valve is further improved, and the well fluid is effectively prevented from being returned.
In this embodiment, the core 32 is a cylindrical steel body having an outer diameter of 40mm and a height of 30 mm. The outer sealing conical surface 321 is located at a position 24mm away from the bottom end of the core body 32, and the diameter of the end, with the smaller diameter, of the outer sealing conical surface 321 is 28 mm.
In order to further improve the sealing performance of the blowout prevention check valve, in the embodiment, the valve body 1 comprises a cylinder 11 and an inner flange 12. The inner flange 12 is located in the barrel 11, an outer peripheral wall of the inner flange 12 is connected with an inner peripheral wall of the barrel 11, a first end of the inner flange 12 is close to the first end of the barrel 11, an inner sealing conical surface 121 is arranged at a position, close to the first end, of the inner peripheral wall of the inner flange 12, the inner sealing conical surface 121 extends along the circumferential direction of the inner flange 12, and the inner sealing conical surface 121 is matched with the outer sealing conical surface 321.
In the implementation manner, the outer sealing conical surface 321 is matched with the inner sealing conical surface 121, and when a passage between two adjacent oil pipes needs to be closed through the blowout prevention check valve, the core body 32 is inserted into the inner flange 12, so that the outer sealing conical surface 321 on the core body 32 and the inner sealing conical surface 121 on the inner flange 12 are sealed and abutted, and therefore the blowout prevention check valve can be effectively closed through the matching between the core body 32 and the inner flange 12. When it is desired to open the passage between two adjacent oil pipes through the blowout preventer check valve, the core 32 is moved out of the inner flange 12, so that a gap is formed between the outer sealing conical surface 321 on the core 32 and the inner sealing conical surface 121 on the inner flange 12, thereby providing a passage for the communication of well fluid between two adjacent oil pipes.
In this embodiment, the barrel 11 includes an upper barrel 11 and a lower barrel 11, and a bottom end of the upper barrel 11 and a top end of the lower barrel 11 are welded together. The upper cylinder body 11 is a cylindrical steel body with the outer diameter of 89mm, the inner diameter of 73mm and the height of 60 mm. The lower cylinder body 11 is a cylindrical steel body with the outer diameter of 73mm and the height of 65 mm.
For the lower cylinder 11, a circular hole having an inner diameter of 62mm and a depth of 20mm is first formed at the top end of the lower cylinder 11. And then, continuously machining the bottom end of the lower cylinder body 11 along the same axis, and machining a circular hole with the inner diameter of 58mm and the depth of 13 mm. And finally, continuously machining the bottom end of the lower cylinder body 11 along the same axis, and machining a circular hole with the inner diameter of 62mm and the depth of 10 mm.
For the inner flange 12, the thickness is 22 mm. To form the inner sealing taper 121, a through hole having an inner diameter of 40mm and a depth of 16mm is coaxially formed at the second end of the inner flange 12. Then, through holes having an inner diameter of 28mm and a depth of 6mm were coaxially formed at the first end of the inner flange 12 so that the two through holes were communicated with each other. Finally, an arc chamfer is processed at the joint of the two through holes, so that an inner sealing conical surface 121 is formed.
In the present embodiment, in order to connect two adjacent oil pipes, the inner peripheral wall of the cylinder 11 has an internal thread at a position near the first end, and the outer peripheral wall of the cylinder 11 has an external thread at a position near the second end, the internal thread and the external thread extending in the axial direction of the cylinder 11, respectively. That is, the cylinder 11 is screwed with the oil pipe located above by an internal thread, and the cylinder 11 is screwed with the oil pipe located below by an external thread.
When processing, internal thread and external screw thread all process through the lathe and go out, and the axial length of internal thread and external screw thread is 50 mm.
With continued reference to fig. 1, in the present embodiment, the inner flange 12 has a first sealing ring 5 on an inner peripheral wall thereof, the first sealing ring 5 is coaxial with the inner flange 12 and located between the first end and the second end of the inner flange 12, and the first sealing ring 5 is configured to be interposed between the inner peripheral wall of the inner flange 12 and the outer peripheral wall of the core body 32.
In the implementation manner, when the passage between two adjacent oil pipes needs to be closed by the blowout prevention check valve, since the core body 32 is inserted in the inner flange 12, the first sealing ring 5 can be stably clamped between the inner peripheral wall of the inner flange 12 and the outer peripheral wall of the core body 32, so as to further improve the sealing effect between the inner flange 12 and the core body 32.
In addition, the first seal ring 5 is located between the first end and the second end of the inner flange 12, and the inner seal tapered surface 121 is located at the first end of the inner flange 12, so the first seal ring 5 does not affect the seal between the inner seal tapered surface 121 and the outer seal tapered surface 321.
In order to realize the stable arrangement of the first sealing ring 5 on the inner circumferential wall of the inner flange 12, a semicircular groove is correspondingly arranged on the inner circumferential wall of the inner flange 12, and the first sealing ring 5 is positioned in the semicircular groove. The axial distance of the semicircular groove from the second end of the inner flange 12 is 9mm, and the diameter of the semicircular groove is 43.6 mm.
Optionally, the inner flange 12 has two first sealing rings 5 on its inner circumferential wall, and the two first sealing rings 5 are sequentially arranged at intervals along the axial direction of the inner flange 12. With such a design, the sealing effect between the inner flange 12 and the core 32 can be further improved.
The first sealing ring 5 is illustratively an O-ring rubber seal of a gauge phi 40 x 1.8 mm.
The number and specifications of the first seal rings 5 can be adjusted according to actual needs. For example, in other embodiments, the number of the first sealing rings 5 can also be 1, 3, etc., which is not limited by the present disclosure.
With continued reference to fig. 1, in the present embodiment, the outer peripheral wall of the core 32 has a second sealing ring 6, the second sealing ring 6 is coaxial with the core 32 and is located at an end of the core 32 away from the valve stem 31, and the second sealing ring 6 is configured to be interposed between the outer peripheral wall of the core 32 and the inner peripheral wall of the inner flange 12.
In the implementation manner, when the passage between two adjacent oil pipes needs to be closed by the blowout prevention check valve, since the core body 32 is inserted in the inner flange 12, the second sealing ring 6 can be stably clamped between the inner peripheral wall of the inner flange 12 and the outer peripheral wall of the core body 32, so as to further improve the sealing effect between the inner flange 12 and the core body 32.
In addition, the second sealing ring 6 is located at one end of the core body 32 away from the valve rod 31, namely, at the second end corresponding to the inner flange 12, the inner sealing conical surface 121 is located at the first end of the inner flange 12, and the first sealing ring 5 is located between the first end and the second end of the inner flange 12, so that the second sealing ring 6 does not affect the sealing between the inner sealing conical surface 121 and the outer sealing conical surface 321, and the sealing of the first sealing ring 5.
In order to realize the stable arrangement of the second sealing ring 6 on the inner circumferential wall of the core body 32, a semicircular groove is correspondingly arranged on the inner circumferential wall of the core body 32, and the second sealing ring 6 is positioned in the semicircular groove. The axial distance of the semicircular groove from the bottom end of the core 32 is 8mm, and the diameter of the semicircular groove is 39 mm.
The second sealing ring 6 is exemplarily an O-ring of a gauge of phi 38.7 x 1.8 mm.
The number and specifications of the second seal rings 6 can be adjusted according to actual requirements. For example, in other embodiments, the number of the second sealing rings 6 can also be 1, 2, 3, etc., which is not limited by the present disclosure.
In this embodiment, the inner peripheral wall of the cylinder 11 has an annular groove 111, the annular groove 111 is coaxial with the cylinder 11, the support seat 2 is a circular plate-shaped structural member, and the outer edge of the support seat 2 is hermetically fitted in the annular groove 111.
In the above implementation manner, the annular groove 111 is formed in the inner peripheral wall of the cylinder 11, and the supporting seat 2 is designed to be a circular plate-shaped structural member, so that the supporting seat 2 can be stably embedded in the annular groove 111, and the stable connection between the supporting seat 2 and the cylinder 11 is realized.
Alternatively, the cylinder 11 and the support seat 2 can be connected together by welding. When the cylinder 11 and the support base 2 are welded, the annular groove 111 can be omitted on the inner circumferential wall of the cylinder 11 to simplify the processing steps.
Illustratively, the supporting seat 2 is located at a round hole of the lower cylinder 11, the inner diameter of which is 58mm, and the supporting seat 2 is a round steel plate of which the outer diameter is 62mm and the thickness is 10 mm.
When the support seat 2 is machined, a through hole with an inner diameter of 10mm is coaxially machined at the center of the support seat 2, the through hole is used for accommodating the valve rod 31, and the through hole is in clearance fit with the valve rod 31. Then, a circle with a radius of 39mm is drawn coaxially, and the overflowing holes 21 with an inner diameter of 10mm are sequentially processed by taking the circle as a reference, and the circle of each overflowing hole 21 is positioned on the circle.
Illustratively, the support seat 2 has 4 overflowing holes 21, and each overflowing hole 21 is arranged at equal intervals along the circumference of the support seat 2, so that the well fluid can uniformly flow through the support seat 2.
In this embodiment, the valve core 3 further includes a limiting member 33, the limiting member 33 is connected to the first end of the valve rod 31, an outer edge of the limiting member 33 protrudes out of an outer peripheral wall of the valve rod 31, and the elastic member 4 is sandwiched between the limiting member 33 and the supporting seat 2.
In the above implementation, the limiting member 33 and the supporting seat 2 are matched together, so that stable clamping of the elastic member 4 is realized, and the elastic member 4 can always drive the valve rod 31 in a direction away from the supporting seat 2.
Optionally, the limiting member 33 is a nut, and the limiting member 33 is in threaded fit with the valve rod 31, so that the assembly between the limiting member 33 and the valve rod 31 is simple. Furthermore, since the elastic member 4 only applies an acting force in the axial direction of the valve rod 31 to the stopper 33, the stopper 33 and the valve rod 31 are screwed together, and the acting force in the direction can be well received, so that the stopper 33 is firmly connected to the valve rod 31.
Of course, in other embodiments, the limiting member 33 can also be a plate-shaped structure with other shapes, such as square, round, etc., and is connected to the valve rod 31 by welding.
Illustratively, the stop 33 is a hexagonal nut of M26 × 12 gauge, and the valve stem 31 is a cylindrical steel body with an outer diameter of 10mm and a length of 140 mm.
Optionally, the elastic element 4 is a spring, the elastic element 4 is sleeved outside the valve rod 31, one end of the elastic element 4 abuts against the limiting element 33, and the other end of the elastic element 4 abuts against the supporting seat 2.
In the implementation manner, the elastic part 4 is sleeved outside the valve rod 31, and the guide of the elastic part 4 can be realized through the valve rod 31, so that the elastic part 4 is prevented from inclining in the telescopic process, and the reliability of the blowout prevention check valve is improved.
The stop member 33 is illustratively a coil spring having a gauge of phi 2 x 12 (inner) 60 x 15N.
It should be noted that the specifications of the limiting member 33, the valve rod 31 and the elastic member 4 can be adjusted according to actual requirements, and the disclosure is not limited thereto.
In this embodiment, the cylinder 11, the inner flange 12, the support seat 2, the valve rod 31, and the core body 32 are all coaxially arranged, which is beneficial to the operation of the blowout prevention check valve, and the communication and the shutoff between two adjacent oil pipes are realized.
The operation of the anti-blowout check valve will be briefly described with reference to fig. 1 and 2.
When no well fluid flows through the blowout prevention check valve, the elastic member 4 is in a compressed state, an acting force towards the first end of the valve body 1 is applied to the valve rod 31, and under the influence of the acting force, the valve rod 31 can enable the core body 32 to always have a tendency to move towards the first end of the valve body 1, so that the outer sealing conical surface 321 on the core body 32 is tightly pressed against the second end of the valve body 1, and reliable sealing is further achieved (see fig. 2).
When well fluid flows from the second end to the first end of the valve body 1 in the blowout-preventing check valve, that is, when the well fluid returns from the oil pipe below to the oil pipe above, the end of the core body 32 away from the valve rod 31 is subjected to the pressure of the well fluid, and the core body 32 has a tendency to move toward the first end of the valve body 1, so that the outer sealing conical surface 321 on the core body 32 is more tightly pressed against the second end of the valve body 1, and reliable sealing is realized (see fig. 2).
When well fluid flows from the first end to the second end of the blowout prevention check valve, namely, when the well fluid flows from the upper oil pipe to the lower oil pipe, the well fluid firstly enters the first space A and enters the second space B through the overflowing hole 21. The well fluid entering the second space B will exert an acting force on one end of the core body 32 close to the valve rod 31, and when the acting force is larger than the elastic force of the elastic member 4, the core body 32 will move towards the second end of the valve body 1, so that a gap is generated between the outer sealing conical surface 321 and the second end of the valve body 1, and the well fluid can flow out of the valve body 1 through the gap and finally enter the oil pipe below, thereby realizing the normal circulation of the well fluid (see fig. 1).
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. A blowout prevention check valve is characterized by comprising a valve body (1), a supporting seat (2), a valve core (3) and an elastic piece (4);
the supporting seat (2) is positioned in the valve body (1), the outer edge of the supporting seat (2) is connected with the inner wall of the valve body (1) to divide the inner space of the valve body (1) into a first space (A) and a second space (B), the first space (A) is close to the first end of the valve body (1), the second space (B) is close to the second end of the valve body (1), an overflowing hole (21) is formed in the supporting seat (2), and the overflowing hole (21) is communicated with the first space (A) and the second space (B);
the valve core (3) comprises a valve rod (31) and a core body (32), the valve rod (31) is slidably inserted on the supporting seat (2), the first end of the valve rod (31) is positioned in the first space (A), and is connected with one part of the elastic piece (4), the other part of the elastic piece (4) is propped against the supporting seat (2), a second end of the valve stem (31) extends towards a second end of the valve body (1), and is connected with the core body (32), the core body (32) is a cylindrical structural member, the peripheral wall of the core body (32) is provided with an outer sealing conical surface (321) at a position close to the valve rod (31), the outer sealing conical surface (321) extends along the circumferential direction of the core body (32), the outer diameter of the outer sealing conical surface (321) is gradually increased along the direction departing from the valve rod (31), the outer sealing conical surface (321) is used for being in sealing contact with the second end of the valve body (1).
2. A blowout prevention check valve as set forth in claim 1 wherein the valve body (1) comprises a barrel (11) and an inner flange (12);
the inner flange (12) is located in the barrel body (11), the outer peripheral wall of the inner flange (12) is connected with the inner peripheral wall of the barrel body (11), the first end of the inner flange (12) is close to the first end of the barrel body (11), an inner sealing conical surface (121) is arranged at the position, close to the first end, of the inner peripheral wall of the inner flange (12), the inner sealing conical surface (121) extends along the circumferential direction of the inner flange (12), and the inner sealing conical surface (121) is matched with the outer sealing conical surface (321).
3. A blowout prevention check valve according to claim 2, wherein the inner flange (12) has a first seal ring (5) on an inner peripheral wall thereof, the first seal ring (5) is coaxial with the inner flange (12) and is located between the first end and the second end of the inner flange (12), and the first seal ring (5) is configured to be sandwiched between the inner peripheral wall of the inner flange (12) and the outer peripheral wall of the core (32).
4. A blowout prevention check valve according to claim 3, wherein the inner flange (12) is provided with two first sealing rings (5) on the inner peripheral wall, and the two first sealing rings (5) are sequentially arranged at intervals along the axial direction of the inner flange (12).
5. A blowout prevention check valve according to claim 2, wherein the outer peripheral wall of the core (32) is provided with a second sealing ring (6), the second sealing ring (6) is coaxial with the core (32) and is located at one end of the core (32) facing away from the valve rod (31), and the second sealing ring (6) is used for being clamped between the outer peripheral wall of the core (32) and the inner peripheral wall of the inner flange (12).
6. A blowout prevention check valve according to claim 2, wherein the inner peripheral wall of the barrel (11) is provided with an annular groove (111), the annular groove (111) is coaxial with the barrel (11), the support seat (2) is a circular plate-shaped structural member, and the outer edge of the support seat (2) is tightly embedded in the annular groove (111).
7. A blowout prevention check valve according to claim 2, wherein the inner peripheral wall of the barrel (11) is internally threaded at a position near the first end, and the outer peripheral wall of the barrel (11) is externally threaded at a position near the second end, the internal thread and the external thread respectively extending in the axial direction of the barrel (11).
8. A blowout prevention check valve according to any one of claims 1 to 7, wherein the spool (3) further comprises a retainer (33), the retainer (33) is connected to the first end of the valve rod (31), the outer edge of the retainer (33) protrudes from the outer peripheral wall of the valve rod (31), and the elastic member (4) is sandwiched between the retainer (33) and the support seat (2).
9. A blowout prevention check valve as set forth in claim 8 wherein said retainer (33) is a nut and said retainer (33) is threadably engaged with said valve stem (31).
10. A blowout prevention check valve according to claim 8, wherein the elastic member (4) is a spring, the elastic member (4) is sleeved outside the valve rod (31), one end of the elastic member (4) abuts against the limiting member (33), and the other end of the elastic member (4) abuts against the supporting seat (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110144343.5A CN112963121A (en) | 2021-02-02 | 2021-02-02 | Blowout prevention check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110144343.5A CN112963121A (en) | 2021-02-02 | 2021-02-02 | Blowout prevention check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112963121A true CN112963121A (en) | 2021-06-15 |
Family
ID=76271987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110144343.5A Pending CN112963121A (en) | 2021-02-02 | 2021-02-02 | Blowout prevention check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112963121A (en) |
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| CN105317398A (en) * | 2014-07-23 | 2016-02-10 | 中国石油天然气股份有限公司勘探开发研究院 | Check valve used for bailing oil production |
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| CN106321916A (en) * | 2016-11-08 | 2017-01-11 | 玉环江林水暖管业有限公司 | Flow safety valve |
| CN208718610U (en) * | 2018-08-08 | 2019-04-09 | 山东威马泵业股份有限公司 | It is a kind of can dock recycle setting insert pump blowout hookup |
| CN110185824A (en) * | 2018-10-22 | 2019-08-30 | 中航光电科技股份有限公司 | A kind of adjustable relief valve |
| CN209875090U (en) * | 2019-04-18 | 2019-12-31 | 中国石油天然气股份有限公司 | Check valve for workover drill rod |
| CN211230384U (en) * | 2019-10-30 | 2020-08-11 | 中国石油天然气股份有限公司 | Air-tight check valve |
| CN212055993U (en) * | 2020-02-25 | 2020-12-01 | 中国石油天然气股份有限公司 | Spring type safety valve |
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2021
- 2021-02-02 CN CN202110144343.5A patent/CN112963121A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6827096B1 (en) * | 2003-06-23 | 2004-12-07 | Pacific Industrial Co., Ltd. | Relief valve |
| CN103322247A (en) * | 2013-06-09 | 2013-09-25 | 安徽艾可蓝节能环保科技有限公司 | Gas-liquid mixing cavity reverse flow stopping device |
| CN105317398A (en) * | 2014-07-23 | 2016-02-10 | 中国石油天然气股份有限公司勘探开发研究院 | Check valve used for bailing oil production |
| CN205260935U (en) * | 2015-11-17 | 2016-05-25 | 江苏美的清洁电器股份有限公司 | Relief valve of dust catcher and dust catcher that has it |
| CN106321916A (en) * | 2016-11-08 | 2017-01-11 | 玉环江林水暖管业有限公司 | Flow safety valve |
| CN208718610U (en) * | 2018-08-08 | 2019-04-09 | 山东威马泵业股份有限公司 | It is a kind of can dock recycle setting insert pump blowout hookup |
| CN110185824A (en) * | 2018-10-22 | 2019-08-30 | 中航光电科技股份有限公司 | A kind of adjustable relief valve |
| CN209875090U (en) * | 2019-04-18 | 2019-12-31 | 中国石油天然气股份有限公司 | Check valve for workover drill rod |
| CN211230384U (en) * | 2019-10-30 | 2020-08-11 | 中国石油天然气股份有限公司 | Air-tight check valve |
| CN212055993U (en) * | 2020-02-25 | 2020-12-01 | 中国石油天然气股份有限公司 | Spring type safety valve |
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Application publication date: 20210615 |