Underwater pressure balanced gate valve for deep sea oil production operations

Abstract

The present application relates to the technical fields of oil extraction safety valve, more particularly to a kind of underwater pressure balanced gate valve for deep-sea oil extraction operation, including gate valve body, the gate valve body includes valve body main body, fluid passage is arranged at the both ends of the valve body main body, fluid passage is arranged with valve plate moving cavity in the middle part, gate plate is installed in the inside of valve plate moving cavity, two air flow holes are arranged in the both sides of valve plate moving cavity, air flow hole is communicated with pressure chamber in the other end, air pressure plate is installed in the inside of pressure chamber;The present application is provided with sealing air bag, it is favorable when gate plate is closed, partial pressure groove negative pressure area disappears, triangular arc groove is preset with sealing air bag, and it is expanded under the action of pressure chamber high pressure, and it is formed dynamic sealing by being closely attached to gate plate;Meanwhile, through sealing air bag and crude oil self-lubricating effect, realize high sealing property and wear resistance under high pressure, it is suitable for deep-sea oil well wellhead valve and other high pressure working conditions, significantly improve the reliability and service life of valve under extreme environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil production safety valve, more particularly to an underwater pressure balance gate valve for deep-sea oil production operation. BACKGROUND

[0002] In deep-sea oil well production operation, the underwater wellhead valve faces the harsh environment of extremely high pressure (up to 300 bar or more), corrosive medium and dynamic pressure impact. The traditional gate valve relies on rigid sealing structure, which is easy to cause sealing failure due to unbalanced pressure difference on both sides of the gate plate under high pressure, leading to leakage accident. At the same time, the maintenance cost of deep-sea is extremely high (more than one million dollars per operation), which puts extremely high requirements on the reliability of the valve.

[0003] At present, the deep-sea wellhead valve mainly adopts the design scheme of rigid sealing combined with external driving mechanism. In order to alleviate the pressure imbalance problem, some existing technical solutions try to set pressure compensation holes or introduce external hydraulic balance system in the valve cavity. For example, by connecting the upper and lower chambers of the valve plate through the pressure guide channel, the medium itself pressure is used to achieve partial balance.

[0004] However, such passive compensation mechanism has obvious defects: first, the traditional pressure balance mechanism is mostly static design, which cannot respond to the dramatic change of chamber pressure caused by the movement of valve plate in deep-sea oil well environment in real time; second, the pressure difference between external high pressure and internal environment is too large, which is easy to cause vibration when the gate plate moves up and down, so that the gate plate cannot be effectively sealed, the rising resistance is large, and the wear is serious; in addition, the existing technology relies on a single sealing form, which is not suitable for deep-sea oil production environment, lacks the self-lubricating effect of oil, and causes the sealing part to wear out in frequent opening and closing, resulting in the decline of sealing performance. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the present application provides an underwater pressure balance gate valve for deep-sea oil production operation to solve the problems existing in the background art.

[0006] An underwater pressure balance gate valve for deep-sea oil production operation, comprising a gate valve body, the gate valve body comprising a valve body, fluid channels are opened at both ends of the valve body, a valve plate moving cavity is opened in the middle of the fluid channel, a gate plate is installed in the valve plate moving cavity, two air flow holes are opened at both sides of the valve plate moving cavity, the other end of the air flow hole is communicated with the pressure chamber, the air pressure plate is installed in the pressure chamber; the valve body is opened with a reversing cavity at the bottom of the pressure chamber, a gear assembly and a negative pressure assembly are installed in the reversing cavity; the valve plate moving cavity is opened with a triangular arc groove and a pressure distribution groove at the fluid channel, the triangular arc groove is located inside the pressure distribution groove, the pressure distribution groove and the pressure chamber are connected through the pressure side hole and the shunt side hole, the pressure side hole and the shunt side hole are connected, and the pressure relief hole is opened at the connection position, and the pressure assembly and the sensing assembly are installed in the pressure relief hole.

[0007] Further, the booster assembly includes air pressure push plates and inclined angle convex rods, the outer side of the air pressure push plate is sleeved with a first spring, two groups of air pressure push plates are mirror-symmetrically installed, the induction assembly and the inclined clamping rod are installed on the central symmetric shaft; the induction assembly includes a water pressure induction plate and a trapezoidal block, the water pressure induction plate is sleeved with a second spring, a clamping groove is formed in the inner side of the water pressure induction plate, and the clamping groove is installed in cooperation with the inclined clamping rod.

[0008] Further, the gear assembly includes a main gear, the main gear is composed of a gear and a rotating rod, two connecting blocks are fixedly connected to the rotating rod, and the connecting blocks are hingedly connected with the negative pressure assembly through the rotating rod; the outer side of the main gear is engaged with the air pressure plate, and when the air pressure plate moves downward, the main gear rotates under the driving of the air pressure plate; the negative pressure assembly includes an air pressure push plate, and the side surface of the air pressure push plate is fixedly connected with a guide sleeve, and the inner side of the guide sleeve is installed with a third spring.

[0009] Further, the air pressure plate includes an air pressure plate body and a toothed plate, the toothed plate is fixedly connected to the bottom of the air pressure plate body, the toothed plate is engaged with the gear assembly, two guide rods are installed in the booster cavity, and the air pressure plate body is installed on the guide rods.

[0010] Further, a sliding groove is formed in the bottom of the side surface of the valve plate moving cavity, and a sealing structure is installed on the sliding groove.

[0011] Further, a sealed air bag is installed in the triangular arc groove.

[0012] Further, the shunt side hole is communicated with the side surface of the reversing cavity.

[0013] Further, an upper end cover is installed on the top of the gate valve body, a valve rod and a hand wheel are installed on the top of the upper end cover, and the valve rod and the hand wheel are connected through threads.

[0014] The technical effects and advantages of the present application are as follows:

[0015] 1. The induction assembly is provided, the deep sea static water pressure can drive the water pressure induction plate to move inwards through the pressure relief hole, the inclined angle convex rod is expanded, the initial pressure reference of the booster cavity and the pressure distribution groove is actively lifted, the pressure in the valve is pre-matched with the deep sea oil well environment, and different oil extraction depths are autonomously and dynamically adapted.

[0016] 2. The booster cavity and the negative pressure assembly are provided, when the gate plate moves upwards, the high-pressure fluid in the upper part of the valve plate moving cavity pushes the air pressure plate to move downwards through the air flow hole, the main gear is counterclockwise rotated through the engagement of the toothed plate, the negative pressure assembly is linked to shrink the volume of the pressure distribution groove to form a negative pressure area, the pressure difference generated by the movement of the gate plate is instantaneously offset, and the movement stability and sealing reliability of the wellhead valve under high pressure are significantly improved.

[0017] 3. The application is beneficial to the disappearance of the negative pressure area of the pressure distribution groove when the gate plate is closed, the pre-installed sealing air bag in the triangular arc groove expands under the high pressure of the pressure increasing cavity, and forms dynamic sealing with the gate plate; at the same time, the crude oil seeps into the air bag micropore to form a lubricating film, reduce wear and tear, and improve the sealing life, especially suitable for deep-sea oil production wellhead valve working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the application.

[0019] Figure 2 It is a cross-sectional view of the overall structure of the application.

[0020] Figure 3 It is a schematic diagram of the gate valve body structure of the application.

[0021] Figure 4 It is a schematic diagram of the pressure increasing assembly structure of the application.

[0022] Figure 5 It is a schematic diagram of the gear assembly structure of the application.

[0023] Figure 6 It is a schematic diagram of the gate plate structure of the application.

[0024] The reference signs are: 1, gate valve body; 101, valve body main body; 102, fluid passage; 103, valve plate moving cavity; 104, pressure increasing cavity; 105, reversing cavity; 106, air flow hole; 107, triangular arc groove; 108, pressure distribution groove; 109, pressure increasing side hole; 110, pressure distribution side hole; 2, upper end cover; 3, valve rod; 4, hand wheel; 5, air pressure plate; 6, pressure increasing assembly; 601, air pressure push plate; 602, first spring; 603, inclined angle protruding rod; 7, sensing assembly; 701, water pressure sensing plate; 702, second spring; 703, trapezoidal block; 8, gear assembly; 801, main gear; 802, connecting block; 803, rotating rod; 9, negative pressure assembly; 901, air pressure push plate; 902, guide sleeve; 903, third spring; 10, pressure relief hole; 11, inclined clamping rod; 12, gate plate; 1201, valve plate main body; 1202, sliding guide groove; 1203, threaded sleeve. DETAILED DESCRIPTION

[0025] The technical solutions in the application will be described clearly and completely below in combination with the drawings in the application, and in addition, the forms of each structure described in the following embodiments are only examples, and the underwater pressure balanced gate valve for deep-sea oil production operation involved in the application is not limited to each structure described in the following embodiments, and all other embodiments obtained by the ordinary skilled in the art without making creative efforts belong to the scope of protection of the application.

[0026] With reference to Figure 1 and Figure 3 The application provides an underwater pressure balance gate valve for deep sea oil extraction, which comprises a gate valve body 1, the gate valve body 1 comprises a valve body main body 101, fluid channels 102 are arranged at both ends of the valve body main body 101, a valve plate moving cavity 103 is arranged at the middle part of the fluid channels 102, a gate plate 12 is arranged in the valve plate moving cavity 103, two air flow holes 106 are arranged at both sides of the valve plate moving cavity 103, the other ends of the air flow holes 106 are communicated with a pressurizing cavity 104, an air pressure plate 5 is arranged in the pressurizing cavity 104, a reversing cavity 105 is arranged at the bottom of the valve body main body 101, a gear assembly 8 and a negative pressure assembly 9 are arranged in the reversing cavity 105, a triangular arc groove 107 and a pressure distribution groove 108 are arranged at the valve plate moving cavity 103 at the fluid channels 102, the triangular arc groove 107 is arranged at the inner side of the pressure distribution groove 108, the pressure distribution groove 108 and the pressurizing cavity 104 are connected through a pressurizing side hole 109 and a shunt side hole 110, a pressure relief hole 10 is arranged at the connecting position of the pressurizing side hole 109 and the shunt side hole 110, a pressurizing assembly 6 and a sensing assembly 7 are arranged in the pressure relief hole 10.

[0027] In the embodiment, it is necessary to be specified that the top of the gate valve body 1 is provided with an upper end cover 2, the top of the upper end cover 2 is provided with a valve rod 3 and a hand wheel 4, and the valve rod 3 and the hand wheel 4 are connected through threads.

[0028] The main difference between the embodiment and the prior art is that, in the embodiment, the high-pressure environment in deep sea oil extraction is utilized, the seawater high pressure is utilized to realize pressure balance when the internal gate plate 12 moves up and down, the internal pressure is compensated, the high-strength sealing effect is realized in combination with the lubricating effect of the oil liquid, and the specific feature lies in the pressurizing assembly 6.

[0029] The above structure is the main structure of the embodiment, the sealing effect of the gate valve in the current deep sea oil extraction environment is improved, and the gate valve can adapt to various environments, and the hand wheel 4 is a prior structure, and the specific structure and connection mode of the hand wheel 4 are not described in the embodiment.

[0030] With reference to Figure 2 The air pressure plate 5 comprises an air pressure plate and a tooth plate, the tooth plate is fixedly connected to the bottom of the air pressure plate, the tooth plate is in meshing connection with the gear assembly 8, two guide rods are arranged in the pressurizing cavity 104, the air pressure plate is arranged on the guide rods, when the valve is opened, the gate plate 12 moves upwards, the movement strengthens the pressure at the upper part of the valve plate moving cavity 103, and the gas gradually enters the inside of the pressurizing cavity 104 from the air flow holes 106 to push the air pressure plate 5 to move downwards.

[0031] In this embodiment, it needs to be specifically pointed out that: the shunt side hole 110 is in communication with the side of the reversing cavity 105, when the air pressure plate 5 moves down, the gear assembly 8 rotates counterclockwise, counterclockwise rotation makes the rotating rod 803 pull the negative pressure assembly 9 to move to the middle, the reversing cavity 105 controls the shunt side hole 110 to reduce the internal pressure of the pressure reduction groove 108.

[0032] Referring to Figure 3 , the inside of the triangular arc groove 107 is provided with a sealed air bag, after the gate plate 12 rises to open the valve, the internal oil is transported through the fluid channel 102, in this process, the oil contacts the sealed air bag, combined with the pressure change of the pressure reduction groove 108 and the lubricating effect of the oil, the air bag has better sealing effect in the deep sea oil extraction environment, reducing the wear phenomenon of the air bag after multiple uses in ordinary liquid valve use.

[0033] In this embodiment, it needs to be specifically pointed out that: the sealed air bag has the functions of valve contraction and valve expansion when used, so that the two sides of the gate plate 12 are better sealed, the sealed air bag and the self-lubricating effect of the crude oil can realize high sealing and wear resistance under high pressure, and is suitable for high pressure working conditions such as deep sea wellhead valve.

[0034] Referring to Figure 4 , the booster assembly 6 includes 601 and an inclined angle protruding rod 603, the outside of 601 is sleeved with a first spring 602, two groups of 601 are mirror-symmetrically installed, the sensing assembly 7 and the inclined clamping rod 11 are installed on the central axis of symmetry, the sensing assembly 7 includes a water pressure sensing plate 701 and a trapezoidal block 703, the water pressure sensing plate 701 is sleeved with a second spring 702, the inside of the water pressure sensing plate 701 is provided with a clamping groove, the clamping groove is installed in cooperation with the inclined clamping rod 11, when the water pressure sensing plate 701 is continuously moved inward under the seawater pressure, the trapezoidal block 703 is inserted into the inside of the inclined angle protruding rod 603, so that the two inclined angle protruding rods 603 are opened outward, increasing the internal pressure of the booster cavity 104 and the pressure reduction groove 108.

[0035] In this embodiment, it needs to be specifically pointed out that: the inside of the sensing assembly 7 is provided with the inclined clamping rod 11, the inclined clamping rod 11 is fixedly installed on the gate valve body 1, while the water pressure sensing plate 701 is continuously moved inward under the seawater pressure, the inclined clamping rod 11 is inserted into the inside of the water pressure sensing plate 701, so that the inclined clamping rod 11 and the sensing assembly 7 are connected through clamping, realizing fixation, avoiding the reduction of long-term use stability due to metal fatigue.

[0036] Referring to Figure 5The gear assembly 8 comprises a main gear 801, the main gear 801 is composed of a gear and a rotating rod, two connecting blocks 802 are fixedly connected on the rotating rod, the connecting blocks 802 are hingedly connected with the negative pressure assembly 9 through a rotating rod 803, the outer side of the main gear 801 is engaged with the air pressure plate 5, when the air pressure plate 5 moves downwards, the main gear 801 rotates under the driving of the air pressure plate 5, the negative pressure assembly 9 comprises an air pressure push plate 901, the side surface of the air pressure push plate 901 is fixedly connected with a guide sleeve 902, the third spring 903 is arranged in the guide sleeve 902, when the pressure in the reversing cavity 105 changes, the air pressure changes, the movement of the gear assembly 8 and the negative pressure assembly 9 is slowed down, the long-time influence on the movement stability, the guide sleeve 902 exerts a reverse force on the structure, and the problem of unstable internal pressure change is solved.

[0037] In the embodiment, it needs to be particularly pointed out that the hinging mode of the connecting blocks 802 and the rotating rod 803 does not affect the rotating process, for the gate valve in the high-pressure oil extraction environment, the up-down movement of the gate plate 12 causes the pressure change in the upper and lower cavities, and the change range is limited, therefore, the rotation of the main gear 801 is not a complete period of rotation, but a half period or even a quarter period of rotation, and the purpose of the rotation is to reversely synchronize the pressure change of the pressure increasing cavity 104 and the pressure dividing groove 108.

[0038] Referring to Figure 6 The gate plate 12 comprises a valve plate body 1201, a sliding guide groove 1202 is formed in the side surface of the valve plate body 1201, a threaded sleeve 1203 is fixedly connected to the top of the valve plate body 1201, the valve rod 3 is installed on the gate plate 12 through the threaded sleeve 1203, a sliding groove is formed in the bottom of the side surface of the valve plate moving cavity 103, a sealing structure is arranged on the sliding groove, the sliding groove cooperates with the sliding guide groove 1202, and the sliding guide groove 1202 realizes the isolation of the upper and lower cavities through the sealing structure on the sliding groove.

[0039] In the embodiment, it needs to be particularly pointed out that the sealing structure is the prior art, and the sealing structure is not described in detail in the application.

[0040] The working principle of the application is as follows:

[0041] The main problem solved by the embodiment is that the high-pressure environment in deep-sea oil extraction is utilized, the seawater high pressure is utilized to realize the pressure balance when the internal gate plate 12 moves up and down, the internal pressure is compensated, the high-strength sealing effect is realized in combination with the lubricating action of the oil liquid, the sealing effect of the gate valve in the current deep-sea oil extraction environment is reduced, various environmental problems cannot be adapted, the locking structure of the inclined clamping rod 11 is utilized to realize the stability of the high-pressure environment, and the internal stability reduction caused by metal fatigue is avoided.

[0042] The specific steps are as follows:

[0043] The gate valve is placed in deep sea environment, as the depth increases, the seawater enters into the pressure relief hole 10, the water pressure sensing plate 701 is moved inward by the seawater pressure, the trapezoidal block 703 is inserted into the internal part of the inclined convex rod 603, the two inclined convex rods 603 are opened outward, the internal pressure of the pressure increasing cavity 104 and the pressure distribution groove 108 is increased;

[0044] When the valve is opened, the rotating hand wheel 4 drives the valve rod 3 to move the gate plate 12 upward, the movement of the gate plate 12 increases the pressure of the valve plate moving cavity 103, the gas gradually enters into the internal part of the pressure increasing cavity 104 from the gas flow hole 106 and pushes the air pressure plate 5 to move downward, the air pressure plate 5 is engaged with the gear assembly 8 at the bottom, the downward movement of the air pressure plate 5 drives the gear assembly 8 to rotate counterclockwise, the counterclockwise rotation drives the rotating rod 803 to pull the negative pressure assembly 9 to move to the middle part, the internal pressure of the pressure distribution groove 108 is reduced, the internal part of the pressure distribution groove 108 is in low pressure environment, the pressure of the sealed air bag in the triangular arc groove 107 is reduced, the air bag is contracted; when the valve is closed, the above process is reversed, the air bag is expanded, the sealing of the gate plate 12 is better, as the depth increases, the pressure value of the pressure distribution groove 108 is continuously increased under the action of the inclined convex rod 603, the sealing pressure of the sealed air bag is increased, the sealing effect is better.

[0045] The above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An underwater pressure balanced gate valve for use in deep sea oil production operations, comprising a gate valve body (1), characterized in that The gate valve body (1) comprises a valve body main body (101), fluid channels (102) for connecting oil pipelines are arranged at both ends of the valve body main body (101), a valve plate moving cavity (103) is arranged at the middle part of the fluid channels (102), a gate plate (12) is arranged in the valve plate moving cavity (103), two air flow holes (106) are arranged at both sides of the valve plate moving cavity (103), the other ends of the air flow holes (106) are communicated with a pressure boosting cavity (104), an air pressure plate (5) is arranged in the pressure boosting cavity (104), a reversing cavity (105) is arranged at the bottom of the valve body main body (101) in the pressure boosting cavity (104), a gear assembly (8) and a negative pressure assembly (9) are arranged in the reversing cavity (105), a triangular arc groove (107) and a pressure dividing groove (108) are arranged at the fluid channels (102) of the valve plate moving cavity (103), the triangular arc groove (107) is arranged at the inner side of the pressure dividing groove (108), the pressure dividing groove (108) and the pressure boosting cavity (104) are connected through a pressure boosting side hole (109) and a shunt side hole (110), a pressure relief hole (10) for communicating with external seawater is arranged at the connection position of the pressure boosting side hole (109) and the shunt side hole (110), a pressure boosting assembly (6) for sensing the deep sea environment pressure and a sensing assembly (7) are arranged in the pressure relief hole (10); The pressure boosting assembly (6) comprises air pressure push plates (601) and inclined angle protruding rods (603), the air pressure push plates (601) are symmetrically arranged and sleeved with first springs (602), the sensing assembly (7) and an inclined clamping rod (11) are arranged on a central symmetric shaft, the sensing assembly (7) comprises a water pressure sensing plate (701) and a trapezoidal block (703), the water pressure sensing plate (701) is sleeved with a second spring (702), a clamping groove is arranged in the water pressure sensing plate (701), and the clamping groove is arranged in cooperation with the inclined clamping rod (11); The gear assembly (8) comprises a main gear (801), the main gear (801) is composed of a gear and a rotating rod, two connecting blocks (802) are fixedly connected to the rotating rod, the connecting blocks (802) are hingedly connected to the negative pressure assembly (9) through a rotating rod (803), the outer side of the main gear (801) is engaged with the air pressure plate (5), when the air pressure plate (5) moves downward, the main gear (801) rotates under the driving of the air pressure plate (5), and the negative pressure assembly (9) comprises an air pressure push plate (901), the side surface of the air pressure push plate (901) is fixedly connected with a guide sleeve (902), and the guide sleeve (902) is internally arranged with a third spring (903); The air pressure plate (5) comprises a toothed plate, the toothed plate is fixedly connected to the bottom of the air pressure plate, the toothed plate is engaged with the gear assembly (8), two guide rods are arranged in the pressure boosting cavity (104), and the air pressure plate is arranged on the guide rods.

2. The underwater pressure balanced gate valve for use in deep sea oil production operations according to claim 1, characterized in that: The gate plate (12) comprises a valve plate body (1201), a sliding guide groove (1202) is formed in the side of the valve plate body (1201), and a threaded sleeve (1203) is fixedly connected to the top of the valve plate body (1201); the valve rod (3) is installed on the gate plate (12) through the threaded sleeve (1203).

3. The underwater pressure balanced gate valve for use in deep sea oil production operations as defined in claim 1, wherein: The bottom of the side of the valve plate moving cavity (103) is provided with a sliding groove, and a sealing structure for the wellhead valve is installed on the sliding groove.

4. The underwater pressure balanced gate valve for use in deep sea oil production operations of claim 1, wherein: The inside of the triangular arc groove (107) is provided with a sealing air bag which can form a lubricating film after contacting crude oil.

5. The deepwater production operation pressure balanced underwater gate valve as claimed in claim 1, wherein: The shunt side hole (110) is in communication with the side of the reversing cavity (105).

6. The underwater pressure balanced gate valve for use in deep sea oil production operations as defined in claim 1, wherein: The top of the gate valve body (1) is provided with an upper end cover (2), the top of the upper end cover (2) is provided with a valve rod (3) and a hand wheel (4), and the valve rod (3) and the hand wheel (4) are connected through threads.

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