CN220151322U

CN220151322U - Pressure relief device

Info

Publication number: CN220151322U
Application number: CN202321432248.6U
Authority: CN
Inventors: 王俊军; 孙经光; 程川; 李敬元; 陈庆堂; 王焕平
Original assignee: Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Downhole Operation Co Sinopec of Shengli Petroleum Engineering Corp
Current assignee: Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Downhole Operation Co Sinopec of Shengli Petroleum Engineering Corp
Priority date: 2023-06-06
Filing date: 2023-06-06
Publication date: 2023-12-08
Anticipated expiration: 2033-06-06

Abstract

The utility model provides a pressure relief device which is used for relieving pressure of a flange with a pressure test connector, and comprises a push rod, a connecting piece and a shell, wherein one end of the push rod can be pushed into a pressure test hole of the pressure test connector, and the connecting piece is connected with the push rod and sleeved on the shell; the connecting piece can with the pressure test connects and connects, the casing with the one end that the connecting piece is connected has and is used for supplying the ejector pin penetrates first perforation, the casing can shelter from the ejector pin with pressure test hole annular space pressure release and warp first perforation with the ejector pin annular space is followed ejector pin axial blowout's fluid. The beneficial effects of the utility model include: simple structure, strong operability, security are high, can improve the work efficiency of flange pressure release.

Description

Pressure relief device

Technical Field

The utility model relates to the technical field of workover operation in the petroleum industry, in particular to a pressure relief device suitable for a wellhead flange.

Background

When the maintenance operation is carried out on the oil and gas well, the pressure of the main seal and the auxiliary seal of the BX158 flange is tested before and after construction, the pressure of the BX156 flange is tested before well completion and well crossing, and the pressure is required to be relieved after the pressure test is qualified; and during the construction of halfway replacement of the four-way valve, the internal pressure of the main sealing ring and the auxiliary sealing ring and the internal pressure of the main sealing ring and the auxiliary sealing ring need to be removed before replacement, and the internal pressure of the main sealing ring and the auxiliary sealing ring need to be removed after the pressure test is qualified after replacement. Therefore, the pressure test work is more frequent in the maintenance operation of the oil and gas well, and the natural pressure release work is more frequent.

When the wellhead flange is decompressed on site, a section of iron wire with proper length is usually sheared and put into the pressure testing joint, and the pressure testing joint nut is used for pushing the iron wire and other soil methods to decompress, so that the pressure testing flange is time-consuming, labor-consuming and low in operability, and is not applicable under the condition that the pressure testing pressure is high or ultrahigh.

Therefore, it is necessary to develop a pressure relief device suitable for high pressure and high operability wellhead flange to solve the above problems or to alleviate the effects of the above problems.

Disclosure of Invention

The utility model provides a pressure relief device which is suitable for relief of a wellhead flange, and can be jacked into a pressure test joint to relieve pressure through a jacking rod and shield fluid sprayed by the pressure relief through a shell, so that the technical problem is effectively solved.

The pressure relief device is used for relieving pressure of the flange with the pressure test connector, and can comprise a push rod, a connecting piece and a shell, wherein one end of the push rod can be pushed into a pressure test hole of the pressure test connector, and the connecting piece is connected with the push rod and sleeved on the shell; the connecting piece can with the pressure testing connects and connects, the casing with the one end that the connecting piece is connected has and is used for supplying the ejector pin penetrates first perforation, the casing can shelter from the ejector pin with the annular space pressure release of pressure testing hole and warp first perforation with the annular space of ejector pin is followed the axial spun fluid of ejector pin.

In one embodiment, one end of the shell far away from the connecting piece is provided with a second through hole for the ejector rod to penetrate through, an adjusting piece in threaded fit with the ejector rod is arranged at the second through hole, and the adjusting piece can adjust the depth of the ejector rod ejected into the pressure test hole.

In one embodiment, the ejector rod may include a smooth section and a threaded section connected to each other, a connection between the smooth section and the threaded section is located inside the housing, the connecting piece is sleeved on the smooth section, and the adjusting piece is matched with the threaded section.

In one embodiment, the smooth section has a radial dimension that is less than a radial dimension of the threaded section.

In one embodiment, the pressure relief device may further include a locking member located inside the housing and sleeved on the threaded section.

In one embodiment, the anti-loosening element is two nuts that are threadedly engaged with and abut against the threaded section of the ejector rod.

In one embodiment, the shell is of a cylindrical structure, and the ejector rod penetrates through the shell along the radial direction of the shell of the cylindrical structure.

In one embodiment, one axial end of the shell is provided with a protection plate axially parallel to the ejector rod, the other axial end of the shell is opened, and the shell forms a semi-closed cylindrical structure.

In one embodiment, the connecting piece is provided with a first mounting hole and a second mounting hole which are coaxial and communicated, the aperture of the first mounting hole is larger than that of the second mounting hole, the first mounting hole is used for being connected with the pressure test connector in a matched mode, and the second mounting hole is used for the ejector rod to penetrate.

In one embodiment, the end portion of the ejector rod, which is used for pushing into one end of the pressure test hole, is tapered.

In one embodiment, a hand wheel is arranged at one end of the ejector rod, which is far away from the connecting piece, and the hand wheel is used for applying force to the ejector rod.

Compared with the prior art, the pressure relief device provided by the utility model has at least the following beneficial effects:

(1) According to the pressure relief device, the single-flow valve in the pressure test connector can be jacked to relieve pressure through the ejector rod, direct impact of high-pressure fluid ejected by pressure relief is shielded through the shell, the damage of the high-pressure fluid to operators is avoided, the safety is high, and the connecting piece is convenient to connect with the pressure test connector, so that the working efficiency of flange pressure relief can be improved.

(2) According to the pressure relief device, the adjusting piece is in threaded fit with the ejector rod, so that the adjusting piece can adjust the depth of the ejector rod ejected into the pressure test hole to realize stable pressure relief, and the pressure relief device is simple in structure and high in operability.

Drawings

The utility model will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a pressure relief device according to an embodiment of the present utility model.

In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.

Reference numerals:

the anti-loosening device comprises a 1-ejector rod, a 2-connecting piece, a 3-shell, a 4-adjusting piece, a 5-anti-loosening piece, a 6-protection plate and a 7-hand wheel.

Detailed Description

The utility model will be further described with reference to the accompanying drawings.

As shown in fig. 1, the pressure relief device is used for relieving pressure of a flange with a pressure test connector, and the pressure relief device can comprise a push rod 1, a connecting piece 2 and a shell 3, wherein one end of the push rod 1 can be pushed into a pressure test hole of the pressure test connector, and the connecting piece 2 is connected with and sleeved on the push rod 1; the connecting piece 2 can be connected with the pressure test joint, and the one end that the casing 3 was connected with the connecting piece 2 has the first perforation that is used for supplying ejector pin 1 to penetrate, and casing 3 can shelter from ejector pin 1 and the annular space pressure release of pressure test hole and follow ejector pin 1 axial spun fluid through the annular space of first perforation and ejector pin 1.

Specifically, the connecting piece 2 is matched with the pressure test connector, so that the quick connection between the connecting piece 2 and the pressure test connector can be realized. The inside of connecting piece 2 and the inboard of casing 3 have been linked together to first perforation, and the internal diameter size of first perforation slightly is greater than the external diameter of ejector pin 1 for ejector pin 1 can be relative connecting piece 2 and casing 3 along its self axial displacement, and forms certain annular space between connecting piece 2 and casing 3 and ejector pin 1, fluid passage when the pressure test hole pressure release. When the pressure relief device is used for flange pressure relief, after the connecting piece 2 is fixedly connected with the pressure test connector, the position of the shell 3 is relatively fixed, the ejector rod 1 penetrates through the shell 3 and the connecting piece 2 to be propped against the pressure test hole in the pressure test connector and props up the check valve in the pressure test hole, so that high-pressure fluid in the flange is discharged along the annular pressure relief of the ejector rod 1 and the pressure test hole and is axially discharged to the inner side of the shell 3 along the annular space between the first through hole and the ejector rod 1, and the shell 3 shields direct impact of the high-pressure fluid, thereby realizing pressure relief of the flange. Overall, pressure relief device carries out the pressure release through ejector pin 1 jack-up pressure test joint interior uniflow valve and shelters from the direct impact of the high-pressure fluid that the pressure release was spouted through casing 3, avoids high-pressure fluid to cause the injury to operating personnel, and the security is high to connecting piece 2 and pressure test joint are connected conveniently can improve the work efficiency of flange pressure release.

It should be noted that the first through hole may only belong to the housing 3, or may belong to a common part of the housing 3 and the connector 2. When the first through hole only belongs to the shell 3, the connecting piece 2 is connected with the shell 3 to realize sleeving the ejector rod 1, or the connecting piece 2 is provided with a connecting hole with the same function as the first through hole to realize sleeving the connecting piece 2 on the ejector rod 1.

As shown in fig. 1, in one example, an end of the housing 3 far away from the connecting piece 2 is provided with a second through hole for the ejector rod 1 to penetrate, and an adjusting piece 4 in threaded fit with the ejector rod 1 is disposed at the second through hole, and the adjusting piece 4 can adjust the depth of the ejector rod 1 ejected into the pressure test hole.

Specifically, the second through hole allows the end of the housing 3 away from the connecting piece 2 to also be sleeved on the ejector rod 1. The outer sides of the two ends of the shell 3 are fixedly connected with the connecting piece 2 and the adjusting piece 4 respectively, and the fixed connection mode can adopt welding, so that the connecting piece 2, the shell 3 and the adjusting piece 4 are fixedly connected into a whole. The adjusting piece 4 is provided with a connecting hole, an internal thread is arranged in the connecting hole and is matched with an external thread on the ejector rod 1, and the ejector rod 1 can move axially along the self relative to the adjusting piece 4 while rotating in the connecting hole of the adjusting piece 4 along the thread; when the ejector rod 1 is subjected to axial external force, the adjusting piece 4 is matched with the external thread of the ejector rod 1 through the internal thread of the connecting hole to have a certain limiting effect on the ejector rod 1, so that the ejector rod 1 is prevented from moving axially. Therefore, when the pressure relief device is used for flange pressure relief, after the connecting piece 2 is fixedly connected with the pressure test joint, the positions of the shell 3 and the adjusting piece 4 are relatively fixed, the ejector rod 1 sequentially penetrates through the connecting hole of the adjusting piece 4, the second through hole of the shell 3, the first through hole and the connecting piece 2 to be propped into the pressure test hole of the pressure test joint, the ejector rod 1 is rotated to enable the ejector rod 1 to be in threaded fit with the adjusting piece 4 to adjust the depth of the ejector rod 1 axially propped into the pressure test hole until a check valve in the pressure test hole is propped up, high-pressure fluid in the flange is ejected along the annular space of the ejector rod 1 and the pressure test hole and is ejected to the inner side of the shell 3 along the annular space between the first through hole at the connecting part 2 and the shell 3, the shell 3 can shield direct impact of the high-pressure fluid, and meanwhile, the threaded fit of the adjusting piece 4 and the ejector rod 1 can prop against the high-pressure fluid to generate axial reverse thrust to the ejector rod 1, so that stable pressure relief of the flange is realized. Overall, pressure relief device makes regulating part 4 can adjust the degree of depth that ejector pin 1 jack-in pressure test hole realize stable pressure release through regulating part 4 and ejector pin 1 screw thread fit, and pressure relief device simple structure, maneuverability are strong.

It should be noted that the present utility model is not limited thereto, and the second through hole may be designed as an internal threaded hole matching the external thread of the ejector rod 1, so that the adjusting member 4 is not required to be provided, but the housing 3 needs to have a wide thickness so as to provide the internal thread, and of course, the second through hole may be designed to have an internal threaded structure matching the external thread of the ejector rod 1 while the adjusting member 4 is provided. It should be further noted that the effect of the housing 3 is mainly to block the injection of the high-pressure fluid and fixedly connect the adjusting member 4 and the connecting member 2, two ends of the housing 3 connected with the adjusting member 4 and the connecting member 2 are connected with the adjusting member 4 and the connecting member 2 through the outer side of the housing 3, the inner side of the housing 3 is used to block the direct injection of the high-pressure fluid between the two ends, and the shape and structure of the housing 3 can meet the two functions.

In one example, the ejector rod 1 may comprise a smooth section and a threaded section, the connection part of the smooth section and the threaded section is located inside the shell 3, the connecting piece 2 is sleeved on the smooth section, and the adjusting piece 4 is matched with the threaded section. Specifically, the outer surface of the smooth section is smooth, friction between the first through hole and the ejector rod 1 can be reduced, the ejector rod 1 is convenient to jack into the pressure test hole, the threaded section is used for being matched with the adjusting piece 4 to adjust the ejector rod 1, certain roughness is needed, and the ejector rod 1 and the adjusting piece 4 are relatively fixed in the axial direction to bear reverse thrust of high-pressure fluid to the end part of the ejector rod 1.

In one example, the radial dimension of the smooth segment is less than the radial dimension of the threaded segment. Specifically, the radial dimension of smooth section is little be convenient for jack-up the uniflow valve in the pressure testing hole, and the radial dimension of screw thread section is big can be better set up the external screw thread and match with the internal screw thread of regulating part 4 to the screw thread section is ejector pin 1 jack-in pressure testing hole's application of force end, and the atress that radial dimension is big can be better can avoid the atress improper to appear crooked or fracture. The aperture of the first through hole at the connection part of the shell 3 and the connecting piece 2 is smaller than the aperture of the second through hole at the connection part of the shell 3 and the adjusting piece 4.

In one example, the pressure relief device may further comprise a locking element 5 located inside the housing 3 and over the threaded section. Specifically, the locking piece 5 can realize axial fixation with the ejector rod 1, when the ejector rod 1 is subjected to the reverse thrust action of high-pressure fluid and the matched threads of the adjusting piece 4 produce relative sliding, the locking piece 5 can resist the inner side of the shell 3 to prevent the ejector rod 1 from escaping out of the shell 3, so that the damage to operators is avoided, and the safety and the reliability of the pressure relief device are further improved.

In one example, the anti-loose member 5 is two nuts which are in threaded engagement with the threaded section of the ejector rod 1 and abut against each other, and the two abutting nuts prevent relative sliding with the threads of the ejector rod 1 so as to realize axial fixation with the ejector rod 1.

In one example, the housing 3 has a cylindrical structure, and the jack 1 penetrates the housing 3 in a radial direction of the housing 3 having the cylindrical structure. Specifically, the shell 3 can well withstand direct injection of high-pressure fluid through the cylinder wall, and the shell 3 with the cylindrical structure is convenient for operators to observe the pressure release condition. The radial cross section of the housing 3 is circular, but the present utility model is not limited thereto, and the radial cross section of the housing 3 may be square, diamond, or the like.

In one example, one axial end of the housing 3 has a shielding plate 6 axially parallel to the jack 1, the other axial end of the housing 3 is opened, and the housing 3 forms a semi-closed cylindrical structure.

Specifically, an operator stands on the side having the shielding plate 6 in operation, and the shielding plate 6 can shield part of the fluid sprayed along the axial direction of the jack 1 and splashed along the radial direction of the jack 1 after impinging on the housing 3. The opening of the semi-closed structure of the housing 3 is used as an opening for fluid outflow and an observation opening for an operator to observe the pressure relief. When the shell 3 is in a cylindrical structure, the ejector rod 1 penetrates through the cylinder walls at two sides of the shell 3 and is used for shielding direct injection of high-pressure fluid, one axial end of the cylindrical shell 3 is sealed to serve as a protection plate 6 to prevent splashing fluid from injuring operators, and the other axial end of the cylindrical shell 3 is open and is used for fluid outflow and pressure relief observation by the operators.

In one example, the connecting member 2 has a first mounting hole and a second mounting hole which are coaxial and communicated, the aperture of the first mounting hole is larger than that of the second mounting hole, the first mounting hole is used for being connected with the pressure test connector in a matched manner, and the second mounting hole is used for the penetrating of the ejector rod 1. The second mounting hole is a connecting hole with the same function as the first through hole so as to realize that the connecting piece 2 is sleeved on the ejector rod 1.

In one example, the end of the ejector rod 1 for pushing into one end of the pressure test hole is tapered. The end part of the ejector rod 1 is conical, so that a check valve in the pressure test hole can be better jacked.

In one example, the end of the ejector rod 1 remote from the connecting piece 2 is provided with a hand wheel 7, the hand wheel 7 being used to apply a force to the ejector rod 1. The hand wheel 7 is convenient for an operator to apply force to the ejector rod 1, and the hand wheel 7 can apply axial thrust to the ejector rod 1 and can apply torque to rotate the ejector rod 1.

It should be noted that, the adjusting member 4 of the present utility model may be a nut having an internal thread matching the thread of the ejector rod 1, and the connecting member 2 may be a pressure test connector nut matching the pressure test connector.

For a better understanding of the utility model, a pressure relief device is described for use in venting a flange in connection with the accompanying drawings.

The whole process of the pressure relief device for relieving the pressure of the flange comprises, but is not limited to, the following:

firstly, installing a pressure relief device, respectively welding and fixing a connecting piece 2 and an adjusting piece 4 with a shell 3, and assembling a mandril 1 and a hand wheel 7; the anti-loose piece 5 is placed inside the placing shell 3, the ejector rod 1 enters the inside of the shell 3 through the adjusting piece 4, passes through the anti-loose piece 5 and the connecting piece 2, and the threaded section of the ejector rod 1 is screwed into the adjusting piece 4 for a certain distance, and the anti-loose piece 5 is also screwed on the threaded section.

When the wellhead flange needs to release pressure, the connecting piece 2 of the pressure release device is arranged on the pressure test joint, so that one side of the shell 3 with the protection plate 6 is opposite to an operator, the hand wheel 7 is rotated clockwise by hand, the ejector rod 1 continuously extends until the single flow valve in the pressure test hole of the pressure test joint is jacked up, and high-pressure fluid flows out along the ejector rod 1 and the annular space of the pressure test hole to realize pressure release;

and after the pressure relief is finished, the hand wheel 7 is rotated anticlockwise, the ejector rod 1 is retracted, and the pressure relief device is dismounted by dismounting the connecting piece 2 on the pressure test joint.

In conclusion, the pressure relief device has the advantages of low manufacturing cost, simplicity in operation, safety, reliability, time and labor saving, capability of improving the working efficiency of pressure relief and wide application prospect.

While the utility model has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present utility model is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. The pressure relief device is used for relieving pressure of the flange with the pressure test connector and is characterized by comprising a push rod, a connecting piece and a shell, wherein one end of the push rod can be pushed into a pressure test hole of the pressure test connector, and the connecting piece is connected with the push rod and sleeved on the shell;

the connecting piece can with the pressure testing connects and connects, the casing with the one end that the connecting piece is connected has and is used for supplying the ejector pin penetrates first perforation, the casing can shelter from the ejector pin with the annular space pressure release of pressure testing hole and warp first perforation with the annular space of ejector pin is followed the axial spun fluid of ejector pin.

2. The pressure relief device according to claim 1, wherein one end of the housing, which is far away from the connecting piece, is provided with a second through hole for the ejector rod to penetrate therethrough, and an adjusting piece in threaded fit with the ejector rod is arranged at the second through hole, and the adjusting piece can adjust the depth of the ejector rod ejected into the pressure test hole.

3. The pressure relief device according to claim 2, wherein the ejector rod comprises a smooth section and a threaded section which are connected, wherein the connection between the smooth section and the threaded section is located inside the housing, the connecting piece is sleeved on the smooth section, and the adjusting piece is matched with the threaded section.

4. The pressure relief device according to claim 3, wherein a radial dimension of said smooth segment is less than a radial dimension of said threaded segment.

5. The pressure relief device of claim 3, further comprising a locking element positioned inside the housing and over the threaded section.

6. The pressure relief device according to claim 5, wherein said anti-loosening element is two nuts that are threadedly engaged with and abut said threaded section of said carrier rod.

7. The pressure relief device according to any one of claims 1 to 6, wherein said housing is a cylindrical structure, and said ejector pin penetrates said housing in a radial direction of said housing of the cylindrical structure.

8. The pressure relief device according to claim 7, wherein said housing has a shield plate at one axial end thereof axially parallel to said carrier rod, said housing being open at the other axial end thereof, said housing forming a semi-closed tubular structure.

9. The pressure relief device according to any one of claims 1 to 6, wherein an end of said ejector pin that is adapted to eject into one end of said pressure test hole is tapered.

10. The pressure relief device according to any one of claims 1 to 6, wherein an end of the ejector rod remote from the connector is provided with a hand wheel for applying a force to the ejector rod.