A carbon dioxide booster pump skid

Abstract

The present invention relates to the technical field of petroleum processing equipment, and in particular to a carbon dioxide booster pump skid; comprising a bottom skid, on the upper side of which a gas-liquid separator and a carbon dioxide booster pump are fixedly mounted; the gas-liquid separator is provided with a liquid inlet, which is connected to a liquid phase inlet via a connecting pipe; the gas-liquid separator is provided with a liquid outlet, which is connected to the suction end of the carbon dioxide booster pump via a pipeline, and the liquid outlet of the carbon dioxide booster pump is connected to a liquid phase outlet; the gas-liquid separator comprises a separator body, a separation chamber is provided in the separator body, and a compression mechanism for compressing the separation chamber is provided on the separator body. In the gas-liquid separator, carbon dioxide in a gas-liquid mixed state can be pressurized during gas-liquid separation to avoid excessive gasification of liquid carbon dioxide, thereby reducing the cost of liquid carbon dioxide.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum processing equipment, in particular to a carbon dioxide booster pump skid. Background Art

[0002] Hydraulic fracturing refers to the process of injecting high-pressure water mixed with sand and chemicals into oil wells to break through the shale layer and release shale gas. The effect of hydraulic fracturing technology in increasing production of low-permeability oil fields and unconventional oil and gas reservoirs is obvious to all. However, the harm of hydraulic fracturing should not be underestimated. Compared with traditional hydraulic fracturing technology, carbon dioxide waterless fracturing does not have the above problems. It has the following advantages: no water phase, no water sensitivity and water lock damage to the reservoir, and at the same time relieves the pressure on the environment and water resources; no residue, no residue damage to the reservoir and the permeability of the supporting fracture; energy enhancement effect, after the pressure is released, the carbon dioxide gas expands and can be quickly returned; carbon is injected into the reservoir to achieve greenhouse gas recovery and treatment. Carbon dioxide booster equipment is the core equipment of carbon dioxide waterless fracturing operations.

[0003] During carbon dioxide anhydrous fracturing operations, carbon dioxide boosting equipment can maintain and pressurize liquid carbon dioxide, reduce pressure fluctuations and insufficient liquid supply, avoid the production of dry ice due to pressure drop, separate vaporized carbon dioxide and discharge it, and provide a large amount of liquid carbon dioxide for the fracturing truck to meet the needs of the fracturing truck.

[0004] In the prior art, liquid carbon dioxide is provided by a carbon dioxide booster pump skid. The carbon dioxide booster pump skid includes a bottom skid, on the upper side of which a gas-liquid separator and a carbon dioxide booster pump are fixedly installed; liquid carbon dioxide is passed through the gas-liquid separator, and gas-liquid separation is achieved in the gas-liquid separation chamber, so that completely liquid carbon dioxide enters the carbon dioxide booster pump, is further pressurized, and is output after pressurization. However, the gas-liquid separator in the prior art cannot adjust its cavity volume, and during use, the liquid carbon dioxide may be further gasified, resulting in an increase in the cost of liquid carbon dioxide. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides a carbon dioxide booster pump skid, which can pressurize carbon dioxide in a gas-liquid mixed state during gas-liquid separation in a gas-liquid separator to avoid excessive gasification of liquid carbon dioxide, thereby reducing the cost of liquid carbon dioxide.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, an embodiment of the present application provides a carbon dioxide booster pump skid; it includes a bottom skid, on the upper side of which a gas-liquid separator and a carbon dioxide booster pump are fixedly mounted; the gas-liquid separator is provided with a liquid inlet, and the liquid inlet is connected to a liquid phase inlet end via a connecting pipe; the gas-liquid separator is provided with a liquid outlet, and the liquid outlet is connected to a suction end of the carbon dioxide booster pump via a pipeline, and the liquid outlet of the carbon dioxide booster pump is connected to a liquid phase outlet end; the gas-liquid separator includes a separator body, a separation chamber is provided in the separator body, and a compression mechanism for compressing the separation chamber is provided on the separator body.

[0009] Preferably, a support ring is integrally formed on the inner side of the separator body and at the upper end of the separation chamber, the upper end of the support ring is fixedly connected to the top of the separator body, and a horizontal sealing ring is integrally formed at the lower end of the support ring, and the sealing ring is fixedly connected to the vertical side wall of the gas-liquid separator; the inner cavity of the support ring is connected to the separation chamber; one end of the compression mechanism is located in the support ring, and compresses the inner cavity of the support ring.

[0010] Preferably, the compression mechanism includes a control motor fixed to the upper end of the separator body, the output shaft of the control motor is fixedly connected to a driving screw, and the driving screw is located in the support ring; a pressure plate is slidably connected in the support ring along the vertical direction, and a limiting sleeve is fixedly connected to the inner side of the separator body and located close to the support ring, and the limiting sleeve is located above the pressure plate; a limiting hole with a "rectangular" cross-section is formed in the limiting sleeve, and a lifting sleeve is slidably connected in the limiting hole, the outer cross-section of the lifting sleeve is rectangular, a threaded hole is formed inside, and the lifting sleeve is threadedly connected to the driving screw, the lower end of the lifting sleeve is fixedly connected to the pressure plate, the outer wall of the pressure plate is provided with a sealing groove, and a sealing ring is arranged in the sealing groove.

[0011] Preferably, a pressure measuring hole is opened on the upper side of the pressure plate, and a pressure measuring assembly is arranged on the side pressure hole.

[0012] Preferably, the pressure measuring assembly includes an elastic diaphragm fixed in the pressure measuring hole, the elastic diaphragm seals the pressure measuring hole, a limit block is arranged in the pressure measuring hole and at one end of the elastic diaphragm away from the separation chamber, the limit block is threadedly connected to the pressure measuring hole, and a pressure sensor is fixedly installed on the limit block and on one side close to the elastic diaphragm.

[0013] Preferably, a transition cavity is enclosed between the separator body, the sealing ring and the support ring, and a connecting hole is opened on the side wall of the support ring. When the pressure plate moves to below the connecting hole, the connecting hole and the separation chamber are separated, and when the pressure plate moves to above the connecting hole, the connecting hole and the separation chamber are connected. An exhaust pipe is connected to the separator body, and the exhaust pipe is connected to the transition cavity.

[0014] Preferably, an engine and a radiator are arranged on the upper side of the bottom skid.

[0015] Preferably, the liquid phase outlet ports are arranged in plurality at intervals, and a control valve is arranged at each liquid phase outlet port.

[0016] (III) Beneficial effects

[0017] The present invention provides a carbon dioxide booster pump skid, which provides liquid carbon dioxide through a gas-liquid separator and a carbon dioxide booster pump. During this process, when the liquid carbon dioxide passes through the gas-liquid separator, the side pressure assembly and compression mechanism provided on the inner side thereof can pressurize the carbon dioxide in a gas-liquid mixed state, thereby avoiding excessive gasification of the liquid carbon dioxide and reducing the cost of the liquid carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a carbon dioxide booster pump skid of the present invention;

[0019] Figure 2 It is a cross-sectional view of a protruding gas-liquid separator in a carbon dioxide booster pump skid of the present invention;

[0020] Figure 3 for Figure 2 A magnified view of the structure in Figure 1.

[0021] Markings in the accompanying drawings:

[0022] 100, bottom skid; 110, liquid phase inlet end; 120, liquid phase outlet end; 200, gas-liquid separator; 210, liquid inlet; 220, liquid outlet; 230, separator body; 240, separation chamber; 250, support ring; 251, connecting hole; 260, sealing ring; 270, transition chamber; 300, carbon dioxide booster pump; 400, compression mechanism; 410, control motor; 420, driving screw; 430, pressure plate; 431, sealing groove; 432, sealing ring; 433, pressure measuring hole; 440, limiting sleeve; 441, limiting hole; 450, lifting sleeve; 451, threaded hole; 500, pressure measuring assembly; 510, elastic diaphragm; 520, limiting block; 530, pressure sensor; 600, engine; 700, radiator. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example

[0025] The present invention provides a carbon dioxide booster pump skid, see Figure 1-Figure 3 , including a bottom skid 100, on which a gas-liquid separator 200 and a carbon dioxide booster pump 300 are fixedly mounted; a liquid inlet 210 is provided on the gas-liquid separator 200, and the liquid inlet 210 is connected to a liquid phase inlet end 110 through a connecting pipe; a liquid outlet 220 is provided on the gas-liquid separator 200, and the liquid outlet 220 is connected to the suction end of the carbon dioxide booster pump 300 through a pipeline, and the liquid outlet 220 of the carbon dioxide booster pump 300 is connected to a liquid phase outlet end 120; the gas-liquid separator 200 includes a separator body 230, in which a separation chamber 240 is provided, and a compression mechanism 400 for compressing the separation chamber 240 is provided on the separator body 230. Through the provided compression mechanism 400, the carbon dioxide in a gas-liquid mixed state can be pressurized during gas-liquid separation to avoid excessive gasification of liquid carbon dioxide, thereby reducing the cost of liquid carbon dioxide.

[0026] Specifically, a support ring 250 is integrally formed inside the separator body 230 and located at the upper end of the separation chamber 240. The upper end of the support ring 250 is fixedly connected to the top of the separator body 230. A horizontal sealing ring 260 is integrally formed at the lower end of the support ring 250. The sealing ring 260 is fixedly connected to the vertical side wall of the gas-liquid separator 200. The inner cavity of the support ring 250 is connected to the separation chamber 240. One end of the compression mechanism 400 is located in the support ring 250 and compresses the inner cavity of the support ring 250.

[0027] The compression mechanism 400 includes a control motor 410 fixed to the upper end of the separator body 230, and the output shaft of the control motor 410 is fixedly connected to a drive screw 420, and the drive screw 420 is located in the support ring 250; a pressure plate 430 is slidably connected in the support ring 250 along the vertical direction.

[0028] A limiting sleeve 440 is fixedly connected to a side surface of the separator body 230 that is located inside and close to the support ring 250 . The limiting sleeve 440 is located above the pressure plate 430 .

[0029] A limiting hole 441 with a rectangular cross section is formed in the limiting sleeve 440, and a lifting sleeve 450 is slidably connected in the limiting hole 441. The outer cross section of the lifting sleeve 450 is rectangular, and a threaded hole 451 is formed inside, and is threadedly connected to the driving screw 420. The lower end of the lifting sleeve 450 is fixedly connected to the pressure plate 430, and a sealing groove 431 is formed on the outer wall of the pressure plate 430, and a sealing ring 432 is arranged in the sealing groove 431. Through the sealing ring 432, it is sealed with the outer support ring 250, and the two can slide.

[0030] A pressure measuring hole 433 is provided on the upper side of the pressure plate 430, and a pressure measuring assembly 500 is arranged on the side pressure hole. The pressure measuring assembly 500 includes an elastic diaphragm 510 fixed in the pressure measuring hole 433, the elastic diaphragm 510 seals the pressure measuring hole 433, a limit block 520 is arranged in the pressure measuring hole 433 and at one end of the elastic diaphragm 510 away from the separation chamber 240, the limit block 520 is threadedly connected in the pressure measuring hole 433, and a pressure sensor 530 is fixedly installed on the limit block 520 and at one side close to the elastic diaphragm 510. Through the pressure measuring assembly 500, the air pressure in the separation chamber 240 can be further detected, and the compression mechanism 400 can be controlled to apply pressure to the separation chamber 240 according to the detection result.

[0031] Better yet, a transition chamber 270 is enclosed between the separator body 230, the sealing ring 260 and the support ring 250, and a connecting hole 251 is opened on the side wall of the support ring 250. When the pressure plate 430 moves to below the connecting hole 251, the connecting hole 251 and the separation chamber 240 are separated, and when the pressure plate 430 moves to above the connecting hole 251, the connecting hole 251 and the separation chamber 240 are connected; an exhaust pipe is connected to the separator body 230, and the exhaust pipe is connected to the transition chamber 270.

[0032] The engine 600 and the radiator 700 are arranged on the upper side of the bottom skid 100. A plurality of liquid phase outlet ports 120 are arranged at intervals, and a control valve is arranged at each liquid phase outlet port 120.

[0033] The present invention provides a carbon dioxide booster pump skid, which provides liquid carbon dioxide through a gas-liquid separator and a carbon dioxide booster pump. During this process, when the liquid carbon dioxide passes through the gas-liquid separator, the side pressure assembly and compression mechanism provided on the inner side thereof can pressurize the carbon dioxide in a gas-liquid mixed state, thereby avoiding excessive gasification of the liquid carbon dioxide and reducing the cost of the liquid carbon dioxide.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0036] The above-mentioned embodiments only express the implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A carbon dioxide booster pump skid; comprising a bottom skid (100), a gas-liquid separator (200) and a carbon dioxide booster pump (300) being fixedly mounted on the upper side of the bottom skid (100); characterized in that: The gas-liquid separator (200) is provided with a liquid inlet (210), and the liquid inlet (210) is connected to a liquid phase inlet end (110) via a connecting pipe; the gas-liquid separator (200) is provided with a liquid outlet (220), and the liquid outlet (220) is connected to a suction end of the carbon dioxide booster pump (300) via a pipeline, and the liquid outlet of the carbon dioxide booster pump (300) is connected to a liquid phase outlet end (120); The gas-liquid separator (200) comprises a separator body (230), a separation chamber (240) is arranged inside the separator body (230), and a compression mechanism (400) for compressing the separation chamber (240) is arranged on the separator body (230); A support ring (250) is integrally formed on the inner side of the separator body (230) and located at the upper end of the separation chamber (240), and the upper end of the support ring (250) is fixedly connected to the top end of the separator body (230); A horizontal sealing ring (260) is integrally formed at the lower end of the support ring (250), and the sealing ring (260) is fixedly connected to the vertical side wall of the gas-liquid separator (200); the inner cavity of the support ring (250) is in communication with the separation chamber (240); One end of the compression mechanism (400) is located inside the support ring (250) and compresses the inner cavity of the support ring (250); The compression mechanism (400) comprises a control motor (410) fixed to the upper end of the separator body (230), the output shaft of the control motor (410) being fixedly connected to a drive screw (420), and the drive screw (420) being located inside the support ring (250); A pressure plate (430) is slidably connected in the vertical direction inside the support ring (250); a limiting sleeve (440) is fixedly connected to a side surface inside the separator body (230) and close to the support ring (250), and the limiting sleeve (440) is located above the pressure plate (430); A limiting hole (441) with a rectangular cross-section is formed in the limiting sleeve (440), and a lifting sleeve (450) is slidably connected in the limiting hole (441). The lifting sleeve (450) has a rectangular outer cross-section and a threaded hole (451) formed inside and is threadedly connected to the driving screw (420). The lower end of the lifting sleeve (450) is fixedly connected to the pressure plate (430), and a sealing groove (431) is formed on the outer wall of the pressure plate (430), and a sealing ring (432) is arranged in the sealing groove (431).

2. A carbon dioxide booster pump skid according to claim 1; characterized in that: A pressure measuring hole (433) is provided on the upper side of the pressure plate (430), and a pressure measuring assembly (500) is arranged on the pressure measuring hole.

3. A carbon dioxide booster pump skid according to claim 2, characterized in that: The pressure measuring assembly (500) comprises an elastic diaphragm (510) fixed in the pressure measuring hole (433), and the elastic diaphragm (510) seals the pressure measuring hole (433); A limit block (520) is provided in the pressure measuring hole (433) and at one end of the elastic diaphragm (510) away from the separation chamber (240); the limit block (520) is threadedly connected to the pressure measuring hole (433); and a pressure sensor (530) is fixedly mounted on the limit block (520) and at a side close to the elastic diaphragm (510).

4. A carbon dioxide booster pump skid according to claim 1, characterized in that: The separator body (230), the sealing ring (260) and the support ring (250) enclose a transition chamber (270); A connecting hole (251) is provided on the side wall of the support ring (250); when the pressure plate (430) moves below the connecting hole (251), the connecting hole (251) and the separation chamber (240) are separated; when the pressure plate (430) moves above the connecting hole (251), the connecting hole (251) and the separation chamber (240) are connected; An exhaust pipe is connected to the separator body (230), and the exhaust pipe is in communication with the transition chamber (270).

5. A carbon dioxide booster pump skid according to claim 1, characterized in that: An engine (600) and a radiator (700) are arranged on the upper side of the bottom skid (100).

6. A carbon dioxide booster pump skid according to claim 1, characterized in that: A plurality of the liquid phase outlet ports (120) are arranged at intervals, and a control valve is arranged at each liquid phase outlet port (120).

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