Associated gas degreaser

Abstract

The utility model discloses an associated gas degreaser which comprises a tank body, the top of one end of the tank body is provided with a mixed oil gas inlet, the top of the other end of the tank body is provided with an associated gas outlet, and the cross section of the tank body between the mixed oil gas inlet and the associated gas outlet is provided with a degreasing filler. The oil removal filler comprises magnetic filler and non-magnetic filler which are alternately arranged and are arranged in groups along the cross section of the tank body, and each group of oil removal filler extends in the vertical direction; electromagnetic coils are respectively wound on the peripheries of the frames of the groups of oil removal fillers, and are respectively connected with the output end of the pulse power supply. The associated gas outlet is connected with an inlet of the cooling and drying device, the cooling and drying device is a tubular heat exchanger, all tubes extend in the vertical direction, an associated gas output pipe extending upwards and a condensate water backflow pipe extending downwards are arranged on the outlet side of the cooling and drying device, and the lower end of the condensate water backflow pipe is connected with a backflow opening in the top of the tank body. The oil remover can avoid regular replacement of adsorption materials, reduce consumption of spare parts and improve oil removal efficiency.

Description

Technical Field

[0001] This utility model relates to an oil separator, and more particularly to an associated gas oil separator, belonging to the technical field of well site oil removal equipment. Background Technology

[0002] Natural gas produced during oilfield extraction is called associated gas, and one important use of it in oilfields is as fuel for heating furnaces. During crude oil extraction, as pressure decreases, not only natural gas is produced, but also light oil and water. As fuel for heating furnaces, it is essential to remove impurities such as light oil and water as much as possible. Therefore, the purification process for associated gas is a crucial step in the production process.

[0003] Chinese utility model patent with announcement number CN 211753073U discloses a natural gas oil separator, including an oil separator shell, a sixth pipe fixedly connected to the lower left end of the oil separator shell, and the right end of the sixth pipe penetrating the left end of the oil separator shell. A water pump is fixedly connected to the left end of the sixth pipe, a fifth pipe is fixedly connected to the inlet of the water pump, a second connector is fixedly connected to the upper end of the fifth pipe, a fourth pipe is fixedly connected to the upper end of the second connector, a filter device is fixedly connected to the upper end of the fourth pipe, oil removal membranes are fixedly connected to the left and right inner walls of the filter device, a third pipe is fixedly connected to the upper end of the filter device, and a first connector is fixedly connected to the upper end of the third pipe.

[0004] The aforementioned device removes oil through a filtration system. Within the filtration system, most oil and large particulate impurities are adsorbed by the filter sponge, while the remaining oil is adsorbed by the degreasing membrane, achieving secondary filtration. However, after prolonged use, the degreasing membrane and filter sponge accumulate a large amount of oil, affecting the oil removal efficiency. Therefore, the filter sponge and degreasing membrane need to be replaced periodically, increasing production costs. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0007] The purpose of this invention is to overcome the problem that existing oil removal devices require regular replacement of filter sponges and oil removal membranes, and to provide an associated gas oil remover that, while ensuring the oil removal effect, avoids the need for regular replacement of adsorption materials, reduces spare parts consumption, and improves oil removal efficiency.

[0008] To solve the above technical problems, this utility model provides an associated gas oil separator, comprising a tank. One end of the tank has a mixed oil and gas inlet, and the other end has an associated gas outlet. The cross-section of the tank between the mixed oil and gas inlet and the associated gas outlet is provided with oil removal packing. The oil removal packing includes alternating magnetic and non-magnetic packing arranged in groups along the cross-section of the tank, with each group of oil removal packing extending vertically. An electromagnetic coil is wound around the outer periphery of the frame of each group of oil removal packing, and each electromagnetic coil is connected to the output terminal of a pulse power supply.

[0009] As an improvement of this utility model, the associated gas outlet is connected to the inlet of the cooling and drying device. The cooling and drying device is a shell-and-tube heat exchanger with each tube extending vertically. The outlet side of the cooling and drying device is provided with an upward-extending associated gas output pipe and a downward-extending condensate return pipe. The lower end of the condensate return pipe is connected to the return port at the top of the tank.

[0010] As a further improvement of this utility model, the lowest point of the outlet end of the tank is provided with a crude oil outlet.

[0011] As a further improvement of this utility model, the oil removal packing is provided in two or more rows along the flow direction of the associated gas.

[0012] As a further improvement of this utility model, the distance between the two oil removal packings is greater than or equal to the thickness of the oil removal packing.

[0013] As a further improvement of this utility model, the bottom of the tank is provided with a slag discharge port, which is located below the oil removal packing.

[0014] As a further improvement of this utility model, the pulse power supply is located in a closed space below the top wall of the tank.

[0015] As a further improvement of this utility model, the pulse power supply is located on the rear side of the corresponding degreasing packing.

[0016] As a further improvement of this utility model, the outer periphery of the electromagnetic coil is covered with two insulating layers.

[0017] As a further improvement of this utility model, the tank body has a circular cross-section or an elliptical cross-section.

[0018] Compared with the prior art, this utility model has achieved the following beneficial effects: by combining the degreasing packing with the pulse device, when the degreasing work is in progress, the pulse device can drive the packing to move, so that the attached oil droplets and dirt fall off, avoiding the need to replace the adsorption material regularly, reducing spare parts consumption, reducing the workload of workers, and reducing procurement costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0020] Figure 1 This is a simplified structural diagram of the associated gas oil separator of this utility model;

[0021] Figure 2 This is a simplified structural diagram of the pulse power supply combined with the degreasing packing in this utility model;

[0022] In the diagram: 1. Mixed oil and gas inlet; 2. Oil removal packing; 3. Pulse power supply; 4. Demister; 5. Associated gas output pipe; 6. Cooling and drying device; 7. Condensate return pipe; 8. Crude oil outlet. Detailed Implementation

[0023] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0024] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0026] like Figure 1 , Figure 2As shown, the associated gas oil separator of this utility model includes a tank with a circular or elliptical cross-section. A mixed oil-gas inlet 1 is located at the top of one end of the tank, and an associated gas outlet is located at the top of the other end. Oil removal packing 2 is provided in the cross-section of the tank between the mixed oil-gas inlet 1 and the associated gas outlet. The oil removal packing 2 is arranged in two rows along the flow direction of the associated gas, or more than two rows can be provided. The spacing between adjacent rows of oil removal packing 2 is greater than or equal to the thickness of the oil removal packing 2, providing sufficient settling space for oil droplets in the associated gas, thus minimizing the problem of secondary entrainment of oil droplets.

[0027] The oil removal packing 2 includes alternating magnetic and non-magnetic packings arranged in groups along the cross-section of the tank, with each group of oil removal packing 2 extending vertically. Each group of oil removal packing 2 has an electromagnetic coil wound around its frame, and the electromagnetic coil is covered with two layers of insulation. Each electromagnetic coil is connected to the output terminal of the pulse power supply 3.

[0028] The pulse power supply 3 is located in a closed space below the top wall of the tank, and multiple sealing rings are provided at the power cord inlet and outlet. The rear side of the degreasing packing 2 is relatively clean, so the pulse power supply 3 is placed on the rear side of the corresponding degreasing packing 2.

[0029] The associated gas outlet is connected to the inlet of the cooling and drying device 6. The cooling and drying device 6 is a shell-and-tube heat exchanger with each tube extending vertically. The outlet side of the cooling and drying device 6 is provided with an upward-extending associated gas output pipe 5 and a downward-extending condensate return pipe 7. The lower end of the condensate return pipe 7 is connected to the return port at the top of the tank.

[0030] The lowest point of the tank's outlet end is equipped with a crude oil outlet 8, which facilitates the periodic discharge of accumulated oil at the bottom of the tank. A slag discharge port is located at the bottom of the tank, below the oil removal packing 2; after the crude oil is completely drained, the slag discharge port can be opened to discharge waste, or a small amount of crude oil can be left to facilitate the discharge of waste and prevent it from accumulating inside the tank. The discharged waste is collected and treated centrally. Example

[0031] The mixed oil and gas enters the inner cavity of the oil separator from the mixed oil and gas inlet 1 at a flow rate of 20 m³ / h. At this time, the oleophilic packing material in the oil separator packing 2 will adsorb the light oil in the mixed oil and gas. The oil separator packing 2 is installed side by side. A pulse power supply 3 is installed near the top of the oil separator packing 2. The pulse power supply 3 can output a periodic commutating pulse current with fixed parameters. The positive and negative terminals of the pulse power supply 3 are connected to electromagnetic coils, which are wound around the outer periphery of the oil separator packing 2.

[0032] When the pulse power supply 3 is working, the electromagnetic coil is energized, generating a magnetic field around it. The direction of this magnetic field changes with the direction of the current inside the coil. The magnetic packing inside the oil-removing packing 2 moves upwards or downwards under the influence of this magnetic field. When the pulse power supply 3 outputs a periodic commutating pulse current with fixed parameters, the packing also experiences a periodic upward and downward movement due to the magnetic field. This up-and-down movement of the packing makes it difficult for accumulated oil droplets to adhere to the oil-removing packing 2, thus preventing a decrease in the oil removal efficiency of the oil separator.

[0033] The cooling and drying device 6 is installed above the outlet of the oil separator. A demister 4 is installed at the outlet. The associated gas from the oil separator enters the cooling and drying device 6. Due to the high temperature of the oil separator, the temperature drops significantly after heat exchange with the outdoor air through the air-cooled pipes of the cooling and drying device 6, and the pressure also decreases further, causing complete condensation of water vapor in the associated gas. The cooling and drying device 6 adopts a tubular design, ensuring a uniform and balanced gas flow through each air-cooled pipe, improving air-cooling efficiency. The liquid outlet is located at the bottom of the cooling and drying device 6, ensuring that the condensed liquid directly enters the oil removal tank through the condensate return pipe 7, forming a closed-loop system and eliminating the problem of freezing and blockage in winter. After separation and adsorption by the oil separator, and then drying and air-cooling by the cooling and drying device 6, the associated gas is purified to a greater extent and discharged from the associated gas output pipe 5 for combustion in the heating furnace area. The oil removed by the oil separator is discharged and recovered from the crude oil outlet 8 at the bottom of the oil separator. Example

[0034] The mixed oil and gas enters the oil separator from inlet 1 at a flow rate of 20 m³ / h. At this time, the packing saturation in the oil separator packing 2 is 85%. The oleophilic packing in the oil separator packing 2 adsorbs the light oil in the mixed oil and gas. Two rows of oil separator packing 2 are installed at the front and back. The pulse power supply 3 outputs a 10-times / min periodic commutating pulse current with a current magnitude of 10A. The positive and negative terminals of the pulse power supply 3 are connected to electromagnetic coils, which are wound around the outer circumference of the oil separator packing 2. When the pulse power supply 3 is working, the electromagnetic coil is energized, and a magnetic field is generated around the electromagnetic coil. The direction of the magnetic field changes with the direction of the current inside the electromagnetic coil. The magnetic packing in the oil separator packing 2 moves upward or downward under the influence of the magnetic field. When the pulse power supply 3 outputs a fixed periodic commutating pulse current, the packing also experiences a magnetic field and moves periodically upward and downward. The up-and-down movement of the packing makes it difficult for accumulated oil droplets to adhere to the oil separator packing 2, thus avoiding a decrease in the oil removal efficiency of the oil separator.

[0035] The cooling and drying device 6 is installed on the top of the oil separator. After the associated gas from the oil separator enters the cooling and drying device 6, the temperature of the gas drops significantly after passing through the air-cooled pipe of the cooling and drying device 6 and exchanging heat with the outdoor air due to the high temperature of the oil separator. At the same time, the pressure also drops further, causing the water vapor in the associated gas to condense completely.

[0036] The outlet of the cooling and drying device 6 is located at the bottom of the device, ensuring that the condensed liquid flows directly into the oil removal tank through the condensate return pipe 7, forming a closed-loop system and eliminating the problem of freezing and blockage in winter. After separation and adsorption by the oil remover, and then drying and air cooling by the cooling and drying device 6, the associated gas is purified to a greater extent and discharged from the associated gas output pipe 5 to be sent to the heating furnace area for combustion. The oil removed by the oil remover is discharged and recovered from the crude oil outlet 8 at the bottom of the oil remover. Example

[0037] The mixed oil and gas enters the oil separator from the mixed oil and gas inlet 1 at a flow rate of 40 m³ / h. At this time, the packing saturation in the oil separator packing 2 is 90%. The oil separator packing 2 adsorbs the light oil in the mixed oil and gas. The oil separator packing 2 is installed side by side. A pulse power supply 3 is installed near the top of the oil separator packing 2. The pulse power supply 3 outputs a 20-times / min periodic commutating pulse current with a current magnitude of 10A. The positive and negative terminals of the pulse power supply 3 are connected to an electromagnetic coil, which is wound around the outer circumference of the oil separator packing 2. When the pulse power supply 3 is working, the electromagnetic coil is energized, and a magnetic field is generated around the electromagnetic coil. The direction of the magnetic field changes with the direction of the current inside the electromagnetic coil. The magnetic packing inside the oil separator packing 2 moves upward or downward under the action of the magnetic field force. When the pulse power supply 3 outputs a fixed periodic commutating pulse current, the packing is also subjected to the magnetic field force and moves upward and downward periodically. The up-and-down movement of the packing makes it difficult for accumulated oil droplets to adhere to the oil separator packing 2, thus avoiding a decrease in the oil removal efficiency of the oil separator.

[0038] The associated gas exiting the oil separator enters the cooling and drying unit 6. Due to the high temperature of the oil separator, the temperature drops significantly after heat exchange with the outdoor air through the air-cooled pipes of the cooling and drying unit 6, and the pressure also decreases further, causing the water vapor in the associated gas to condense completely. The liquid outlet of the cooling and drying unit 6 is located at the bottom of the unit, ensuring that the condensed liquid flows directly into the oil removal tank through the condensate return pipe 7, forming a closed-loop system and eliminating the problem of freezing and blockage in winter. After separation and adsorption by the oil separator, and then drying and air cooling by the cooling and drying unit 6, the associated gas is purified to a greater extent and discharged from the associated gas output pipe 5 to be sent to the heating furnace area for combustion. The oil removed by the oil separator is discharged and recovered from the crude oil outlet 8 at the bottom of the oil separator.

[0039] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A gas-associated gas oil separator, comprising a tank, wherein a mixed oil-gas inlet is provided at the top of one end of the tank, and a gas-associated gas outlet is provided at the top of the other end, characterized in that, The cross-section of the tank between the mixed oil and gas inlet and the associated gas outlet is equipped with oil removal packing. The oil removal packing includes alternating magnetic and non-magnetic packing arranged in groups along the cross-section of the tank, with each group of oil removal packing extending vertically. An electromagnetic coil is wound around the outer periphery of the frame of each group of oil removal packing, and each electromagnetic coil is connected to the output end of a pulse power supply. A slag discharge port is provided at the bottom of the tank, located below the oil removal packing. A crude oil outlet is provided at the lowest point of the outlet end of the tank.

2. The associated gas oil separator according to claim 1, characterized in that: The associated gas outlet is connected to the inlet of the cooling and drying device. The cooling and drying device is a shell-and-tube heat exchanger with each tube extending vertically. The outlet side of the cooling and drying device is provided with an upward-extending associated gas output pipe and a downward-extending condensate return pipe. The lower end of the condensate return pipe is connected to the return port at the top of the tank.

3. The associated gas oil separator according to claim 1, characterized in that: The oil removal packing is arranged in two or more rows along the flow direction of the associated gas.

4. The associated gas oil separator according to claim 3, characterized in that: The spacing between the two oil removal packings is greater than or equal to the thickness of the oil removal packing.

5. The associated gas oil separator according to claim 1, characterized in that: The pulse power supply is located in an enclosed space below the top wall of the tank.

6. The associated gas oil separator according to claim 5, characterized in that: The pulse power supply is located behind the corresponding degreasing packing.

7. The associated gas oil separator according to claim 1, characterized in that: The electromagnetic coil is covered with two insulating layers.

8. The associated gas oil separator according to claim 1, characterized in that: The tank body has a circular or elliptical cross-section.

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