Sediment-preventing pressure compensation mechanism

Abstract

The utility model discloses a pressure compensation mechanism capable of preventing silt. Comprising an SCM shell which is of a cylindrical structure, a first opening is formed in the lower end of the SCM shell, and a detachable SCM chassis is arranged at the first opening in a sealed mode; the seawater compensator shell is arranged in the SCM shell and is fixed at the second opening; the seawater compensator cover is arranged at the third opening and is detachably connected with the seawater compensator shell in a sealed mode, a plurality of breathing holes are evenly distributed in the seawater compensator cover in the radial direction, and the breathing holes are used for communicating the exterior of the seawater compensator cover with an inner cavity of the seawater compensator shell and balancing the pressure of the inner cavity; the leather bag is arranged in the seawater compensator shell, and a bag opening of the leather bag penetrates through the through hole, extends into the SCM shell and is communicated with the SCM shell; the nut is arranged on the bag opening in a sleeving manner; and an overflow valve. The pressure compensation valve has the advantage of being capable of achieving pressure compensation.

Description

TECHNICAL FIELD

[0001] The utility model relates to ocean petroleum engineering technology, especially a kind of pressure compensation mechanism of sand prevention. BACKGROUND

[0002] Subsea control module (SCM) is the core control component used to control subsea Christmas tree, manifold and other drilling and production equipment in offshore oil and gas field, and its basic functions are as follows: 1) monitoring various sensor parameters located on subsea Christmas tree or manifold, and transmitting parameter information to platform master station; 2) receiving control signals sent by platform master station to realize opening / closing operation of hydraulic drive valves, subsea safety valves and other equipment on subsea Christmas tree or manifold.

[0003] Considering cost and equipment weight and other factors, the shell of subsea control module (SCM) is designed as a structure that cannot withstand external pressure, which maintains the internal pressure of SCM consistent with the external water depth pressure through pressure compensation mechanism. Occasionally, the pressure compensation mechanism of the existing service product is blocked by sand, or sand enters the internal space of the pressure compensation mechanism through the breathing hole, which weakens the compensation function, and there is a technical risk. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a pressure compensation mechanism capable of preventing sand, which is provided with a SCM shell, a seawater compensator shell, a seawater compensator cover and a bladder, and can realize pressure compensation.

[0005] The utility model also aims at providing a pressure compensation mechanism capable of preventing sand, wherein the breathing hole is composed of a blind hole and an inclined hole connected in sequence; the blind hole is vertically upwardly arranged, and the starting end is in communication with the inner cavity of the seawater compensator shell; the inclined hole is obliquely downwardly arranged, the starting end is connected with the blind end of the blind hole, and the end is in communication with the outside of the seawater compensator cover, which can prevent sand from entering the seawater compensator shell through the breathing hole and weakening the compensation function.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme, comprising:

[0007] The SCM shell is in a cylindrical structure, a first opening is arranged at the lower end of the SCM shell, and a detachable SCM bottom plate is sealingly arranged at the first opening; a second opening is arranged at the center of the upper end surface of the SCM shell;

[0008] The seawater compensator shell is arranged in the SCM shell and fixed at the second opening; the seawater compensator shell is in a cylindrical structure, a third opening is arranged at the upper end of the seawater compensator shell; a through hole is arranged at the center of the lower end surface of the seawater compensator shell;

[0009] A seawater compensator cover is arranged at the third opening and detachably connected with the seawater compensator shell in a sealed manner. A plurality of breathing holes are uniformly arranged on the seawater compensator cover in a radial direction. The breathing holes are used to communicate the inside of the seawater compensator shell with the outside of the seawater compensator cover, and balance the pressure in the inside of the seawater compensator shell.

[0010] A skin bag is arranged in the seawater compensator shell. A bag opening of the skin bag extends into the SCM shell through the through hole and communicates with the SCM shell.

[0011] A nut is sleeved on the bag opening and used to apply a torque to excite a sealing ring on the bag opening, so as to seal the bag opening with the seawater compensator shell.

[0012] An overflow valve is eccentrically arranged on the upper end surface of the SCM shell and used to release pressure when the pressure in the SCM shell is too high.

[0013] The skin bag and the SCM shell are filled with insulating oil. The breathing hole is composed of a blind hole and an inclined hole connected in sequence. The blind hole is vertically arranged upward and has a starting end communicating with the inside of the seawater compensator shell. The inclined hole is arranged obliquely downward and has a starting end connected with the blind end of the blind hole and a terminal end communicating with the outside of the seawater compensator cover.

[0014] Preferably, the overflow valve is threadedly connected with the SCM shell.

[0015] Preferably, a first radial sealing ring and a first end surface sealing ring are respectively arranged between the second opening and the seawater compensator shell. The seawater compensator shell is connected with the SCM shell by bolts and fastened.

[0016] Preferably, a second radial sealing ring and a second end surface sealing ring are respectively arranged between the first opening and the SCM bottom plate. The SCM bottom plate is connected with the SCM shell by bolts and fastened.

[0017] Preferably, the application further comprises:

[0018] A skin bag support block is arranged in the seawater compensator shell. An upper end surface of the skin bag support block is adapted to the lower end of the skin bag and used to abut against the lower end of the skin bag and support the skin bag to keep the natural shape of the skin bag.

[0019] Preferably, the application further comprises: the plurality of breathing holes are 15, and the inclination of the inclined hole is 30°.

[0020] Preferably, the application further comprises: the seawater compensator cover is made of ultra-high molecular polyethylene material and can prevent marine organisms from adhering.

[0021] Preferably, it further comprises: a sealing pressure test port on the seawater compensator housing and located between the first radial sealing ring and the first end face sealing ring, for detecting the sealing performance of the first radial sealing ring and the first end face sealing ring.

[0022] The beneficial effects of the utility model are as follows: it is provided with an SCM shell, a seawater compensator shell, a seawater compensator cover and a bladder; when it is lowered, the pressure in the SCM shell changes, seawater enters between the seawater compensator shell and the bladder through the breathing hole, squeezing the bladder, causing the insulating oil in the bladder to flow toward the SCM shell, and excess insulating oil overflows from the pressure relief valve on the top of the SCM shell, thereby achieving pressure compensation; the breathing hole is composed of a blind hole and an inclined hole connected in sequence; the blind hole is vertically arranged upward, and the starting end is communicated with the inner cavity of the seawater compensator shell; the inclined hole is inclined downward, and the starting end is connected to the blind end of the blind hole, and the end is communicated with the outside of the seawater compensator cover, which can prevent mud and sand from entering the seawater compensator shell through the breathing hole and weakening the compensation function. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Fig. 1 This is a schematic diagram of a pressure compensation mechanism for preventing sedimentation in the present invention.

[0024] Fig. 2 It is a cross-sectional view of the seawater compensator cover in the utility model. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below with reference to the accompanying drawings so that those skilled in the art can implement it according to the description.

[0026] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or other elements or combinations thereof.

[0027] like Figs. 1-2 As shown, the utility model is a pressure compensation mechanism for preventing sediment, comprising:

[0028] The SCM housing 8 is a cylindrical structure. A first opening is provided at the lower end of the SCM housing 8. A detachable SCM chassis 9 is sealed at the first opening. A second opening is provided at the center of the upper end surface of the SCM housing 8.

[0029] A seawater compensator housing 4 is disposed in the SCM housing 8 and fixed at the second opening; the seawater compensator housing 4 is a cylindrical structure, and a third opening is provided at the upper end of the seawater compensator housing 4; a through hole is provided at the center of the lower end surface of the seawater compensator housing 4;

[0030] A seawater compensator cover 1 is provided at the third opening and is sealed and detachably connected to the seawater compensator housing 4. A plurality of breathing holes 14 are evenly distributed radially on the seawater compensator cover 1. The breathing holes are used to connect the outside of the seawater compensator cover 1 with the inner cavity of the seawater compensator housing 4 to balance the pressure of the inner cavity.

[0031] a bladder 5 disposed in the seawater compensator housing 4, the bladder opening of the bladder 5 extending through the through hole into the SCM housing 8 and communicating with the SCM housing 8;

[0032] A nut 7 is sleeved on the sac opening and is used to apply torque to activate the sealing ring of the sac opening to seal the sac opening with the seawater compensator housing 4;

[0033] A relief valve 13 is eccentrically arranged on the upper end surface of the SCM housing 8 and is used to release pressure when the pressure in the SCM housing 8 is too high;

[0034] Insulating oil is contained in the bladder 5 and the SCM housing 8; the breathing hole 14 is composed of a blind hole 14-1 and an inclined hole 14-2 connected in sequence; the blind hole 14-1 is arranged vertically upward, and the starting end is connected to the inner cavity of the seawater compensator shell 4; the inclined hole 14-2 is arranged obliquely downward, and the starting end is connected to the blind end of the blind hole 14-1, and the end is connected to the outside of the seawater compensator cover 1.

[0035] During use, when lowered, as the seawater depth increases, the pressure of the SCM housing 8 increases, seawater enters between the seawater compensator housing 4 and the bladder 5 through the breathing hole 14, the volume of the bladder 5 decreases, and the insulating oil in the bladder 5 enters the SCM housing. After reaching a certain pressure, it overflows from the SCM housing overflow valve 13, thereby ensuring that the pressure inside and outside the SCM is consistent and achieving pressure compensation; the breathing hole 14 is composed of a blind hole 14-1 and an inclined hole 14-2 connected in sequence; it can prevent mud and sand from entering the seawater compensator housing 4 through the breathing hole 14 and weakening the compensation function.

[0036] In another embodiment, the overflow valve is further provided with a threaded connection to the SCM housing.

[0037] In another embodiment, a first radial sealing ring 3 and a first end face sealing ring 2 are respectively provided between the second opening and the seawater compensator housing 4, and the seawater compensator housing 4 is connected and fastened to the SCM housing 8 by bolts.

[0038] In another embodiment, a second radial sealing ring 11 and a second end face sealing ring 10 are respectively provided between the first opening and the SCM chassis, and the SCM chassis 9 is connected and fastened to the SCM housing 8 by bolts.

[0039] In another embodiment, it also includes: a bladder support block 6, which is arranged in the seawater compensator housing 4, and the upper end surface of the bladder support block 6 is adapted to the lower end of the bladder 5, and is used to abut against the lower end of the bladder 5 to support the bladder 5 so that the bladder 5 maintains a natural shape.

[0040] In another embodiment, the present invention further includes: the number of the plurality of breathing holes is 15, and the slope of the inclined hole 14-2 is 30°.

[0041] In another embodiment, the seawater compensator cover 1 is made of ultra-high molecular polyethylene material to prevent marine organisms from attaching.

[0042] In another embodiment, it further includes: a sealed pressure test port 12, which is on the seawater compensator housing 4 and is located between the first radial sealing ring 3 and the first end face sealing ring 2, and is used to detect the sealing performance of the first radial sealing ring 3 and the first end face sealing ring 2.

[0043] In summary, the utility model is a silt-proof pressure compensation mechanism, which is provided with an SCM housing 8, a seawater compensator shell 4, a seawater compensator cover 1 and a bladder 5, which can realize pressure compensation; the breathing hole 14 is composed of a blind hole 14-1 and an inclined hole 14-2 connected in sequence; the blind hole 14-1 is arranged vertically upward, and the starting end is connected to the inner cavity of the seawater compensator shell 4; the inclined hole 14-2 is arranged obliquely downward, and the starting end is connected to the blind end of the blind hole 14-1, and the end is connected to the outside of the seawater compensator cover 1, which can prevent silt from entering the seawater compensator shell 4 through the breathing hole 14 and weakening the compensation function.

[0044] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A pressure compensation mechanism for preventing sediment, characterized in that: include: The SCM housing is a cylindrical structure, with a first opening provided at the lower end thereof, and a detachable SCM chassis sealed at the first opening; A second opening is provided at the center of the upper end surface of the SCM housing; a seawater compensator housing, which is disposed in the SCM housing and fixed at the second opening; the seawater compensator housing is a cylindrical structure, and a third opening is provided at the upper end of the seawater compensator housing; a through hole is provided at the center of the lower end surface of the seawater compensator housing; A seawater compensator cover is provided at the third opening and is sealed and detachably connected to the seawater compensator housing. A plurality of breathing holes are evenly distributed radially on the seawater compensator cover. The breathing holes are used to connect the outside of the seawater compensator cover with the inner cavity of the seawater compensator housing to balance the pressure of the inner cavity. A bladder is disposed in the seawater compensator housing, wherein the bladder opening extends into the SCM housing through the through hole and is in communication with the SCM housing; A nut is sleeved on the sac opening and is used to apply torque to activate the sealing ring of the sac opening to seal the sac opening with the seawater compensator housing; A relief valve, eccentrically arranged on the upper end surface of the SCM housing, is used to relieve pressure when the pressure in the SCM housing is too high; Insulating oil is contained in the bladder and the SCM shell; the breathing hole consists of a blind hole and an inclined hole connected in sequence; the blind hole is arranged vertically upward, and the starting end is connected to the inner cavity of the seawater compensator shell; the inclined hole is arranged obliquely downward, and the starting end is connected to the blind end of the blind hole, and the end end is connected to the outside of the seawater compensator cover.

2. The anti-sediment pressure compensation mechanism according to claim 1, characterized in that: The relief valve is threadedly connected to the SCM housing.

3. The anti-sediment pressure compensation mechanism according to claim 1, characterized in that: A first radial sealing ring and a first end face sealing ring are respectively provided between the second opening and the seawater compensator housing. The seawater compensator housing is connected and fastened to the SCM housing by bolts.

4. The anti-sediment pressure compensation mechanism according to claim 1, characterized in that: A second radial sealing ring and a second end face sealing ring are respectively provided between the first opening and the SCM chassis. The SCM chassis is connected and fastened to the SCM housing by bolts.

5. The anti-sediment pressure compensation mechanism according to claim 1, characterized in that: Also includes: A bladder support block is arranged in the seawater compensator housing. The upper end surface of the bladder support block is adapted to the lower end of the bladder and is used to abut against the lower end of the bladder to support the bladder and keep the bladder in a natural shape.

6. The anti-sediment pressure compensation mechanism according to claim 1, characterized in that: Also includes: There are 15 breathing holes, and the inclination of the inclined holes is 30°.

7. The anti-sediment pressure compensation mechanism according to claim 1, characterized in that: Also includes: The seawater compensator cover is made of ultra-high molecular polyethylene material and can prevent marine organisms from attaching.

8. The anti-sediment pressure compensation mechanism according to claim 3, characterized in that: Also includes: The sealed pressure test port is on the seawater compensator housing and is located between the first radial sealing ring and the first end face sealing ring, and is used to detect the sealing performance of the first radial sealing ring and the first end face sealing ring.

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