A nozzle-replaceable and self-insulating ejector-type casing gas recovery device

Abstract

The present invention discloses an ejection-type casing gas recovery device with replaceable nozzles and self-insulation, comprising a lower joint, an upper joint, a connecting tube, a pressure ring and a nozzle, one end of the connecting tube is detachably connected to the lower joint, the other end of the connecting tube is connected to the upper joint, the lower joint, the connecting tube and the upper joint sequentially form a flow pipeline, the interior of the connecting tube is composed of an installation cavity and a pressure cavity, the pressure ring and the nozzle are both built into the installation cavity of the connecting tube, one side of the pressure ring abuts against the lower joint, the other side of the pressure ring abuts against one side of the nozzle, the pressure ring is connected to the nozzle, the other side of the nozzle abuts against the installation cavity, and the nozzle is connected to the pressure cavity; the problem in the prior art that the nozzle caliber is fixed, the casing gas recovery device is difficult to adapt to crude oils of different flow rates, and a heating device needs to be installed on the ejector to prevent the generation of hydrates to block the device is solved.

Description

Technical Field

[0001] The invention relates to the technical field of casing gas recovery in petroleum engineering, and in particular to an ejection type casing gas recovery device with replaceable nozzles and self-insulation. Background Art

[0002] At present, a large amount of natural gas is dissolved in high-temperature and high-pressure formation oil to form dissolved gas. In crude oil production, the reservoir fluid flowing in the wellbore, when the fluid flow pressure is reduced, the gas dissolved in the crude oil is separated and enters the annular space of the oil casing to form casing gas. If the casing mouth is sealed, the natural gas in the casing will not be discharged, which will affect the pumping efficiency of the oil pump and even cause the oil pump to be gas locked and unable to pump oil, which has a great impact on crude oil production. In order to improve the pumping efficiency, the casing gas will be directly discharged into the air or burned, but it causes a waste of effective energy and seriously pollutes the atmospheric environment. Therefore, many casing gas recovery devices have appeared on the market to solve the above-mentioned casing gas problem.

[0003] The crude oil flow rate in different well conditions is very different. However, the casing gas recovery device on the market is difficult to adjust to adapt to crude oil with different flow rates due to the fixed diameter of the nozzle. Therefore, different types of casing gas recovery devices need to be equipped during operation, which is not economical and practical. In addition, a heating device needs to be installed on the ejector to prevent the formation of hydrates that may clog the device. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and provide an ejector-type casing gas recovery device with replaceable nozzles and self-insulation, thereby solving the problems in the prior art that the nozzle diameter is fixed, the casing gas recovery device is difficult to adapt to crude oil of different flow rates, and a heating device needs to be installed on the ejector to prevent the formation of hydrates to block the device.

[0005] In order to solve the above technical problems, the present invention provides an ejection-type casing gas recovery device with replaceable nozzles and self-insulation, comprising a lower joint, an upper joint, a connecting tube, a pressure ring and a nozzle, one end of the connecting tube is detachably connected to the lower joint, the other end of the connecting tube is connected to the upper joint, the lower joint, the connecting tube and the upper joint sequentially form a flow channel, the interior of the connecting tube is composed of an installation cavity and a pressure cavity, the pressure ring and the nozzle are both built into the installation cavity of the connecting tube, one side of the pressure ring is in contact with the lower joint, and the other side of the pressure ring is in contact with the One side of the nozzle is abutted, the pressure ring is connected to the nozzle, the other side of the nozzle is abutted with the installation cavity, the nozzle is connected to the pressure cavity, and the side wall of the connecting tube is provided with an air inlet connected to the flow pipe; the connecting tube is provided with a first flow channel and a second flow channel, one end of the first flow channel is connected to the interior of the lower joint, the other end of the first flow channel is connected to the connecting cavity formed between the connecting tube and the upper joint, one end of the second flow channel is connected to the connecting cavity, and the other end of the second flow channel is connected to the inlet of the nozzle.

[0006] The beneficial effects of the present invention are as follows: different from the prior art, the present invention is characterized in that the lower joint and the connecting tube are detachably connected. After the pressure ring and the nozzle are disassembled, the pressure ring and the nozzle can be taken out and replaced with nozzles of different calibers, so that the present invention is suitable for oils with different flow rates. The casing gas entering the circulation pipeline from the air inlet is mixed with the oil in the circulation pipeline and is discharged along with the oil, so that the casing gas can be recycled. Moreover, the oil flows from the first flow channel into the connecting cavity, flows back into the second flow channel, and is finally introduced into the nozzle, which keeps the connecting tube warm and prevents the formation of hydrates to block the device. No additional heating device is required to save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0008] Figure 2 is a cross-sectional view of a connecting tube in an embodiment of the present invention;

[0009] Figure 3 is a side view of a connecting tube in an embodiment of the present invention;

[0010] Figure 4 is a schematic structural diagram of a pressure ring in an embodiment of the present invention;

[0011] Figure 5 It is a flowchart of an embodiment of the present invention. DETAILED DESCRIPTION

[0012] 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.

[0013] like Figure 1 As shown, the present invention provides an ejector-type casing gas recovery device with replaceable nozzles and self-insulation, comprising a lower joint 100, an upper joint 200, a connecting tube 300, a pressure ring 400 and a nozzle 500, one end of the connecting tube 300 is detachably connected to the lower joint 100, and the other end of the connecting tube 300 is connected to the upper joint 200, and the lower joint 100, the connecting tube 300 and the upper joint 200 sequentially form a flow channel, and the interior of the connecting tube 300 is composed of an installation cavity 310 and The pressure chamber 320 is composed of a pressure ring 400 and a nozzle 500. Both the pressure ring 400 and the nozzle 500 are built in the installation chamber 310 of the connecting tube 300. One side of the pressure ring 400 abuts against the lower joint 100, and the other side of the pressure ring 400 abuts against one side of the nozzle 500. The pressure ring 400 is connected to the nozzle 500, and the other side of the nozzle 500 abuts against the installation chamber 310. The nozzle 500 is connected to the pressure chamber 320. The side wall of the connecting tube 300 is provided with an air inlet 330 connected to the flow pipe.

[0014] Among them, the upper joint 200 is connected to the oil outlet pipe, the lower joint 100 is connected to the oil inlet pipe, the upper joint 200 and the connecting tube 300 are connected by threaded connection, and the lower joint 100 and the connecting tube 300 are connected by threaded connection. It can be understood that the connection method between the upper joint 200 and the connecting tube 300 can also be replaced by other methods, which is also convenient for disassembly. Similarly, the connection method between the above-mentioned lower joint 100 and the connecting tube 300 can adopt any quick-release method to facilitate disassembly and stable connection.

[0015] like Figure 2 As shown, a first flow channel 340 and a second flow channel 350 are provided on the connecting tube 300 in this embodiment, one end of the first flow channel 340 is connected to the interior of the lower joint 100, the other end of the first flow channel 340 is connected to the connecting cavity 210 formed between the connecting tube 300 and the upper joint 200, one end of the second flow channel 350 is connected to the connecting cavity 210, and the other end of the second flow channel 350 is connected to the inlet of the nozzle 500.

[0016] Preferably, there are multiple first flow channels 340 , and the multiple first flow channels 340 are parallel to each other and arranged along the circumference of the connecting tube 300 .

[0017] Preferably, there are multiple second flow channels 350 , which are parallel to each other and arranged along the circumference of the connecting tube 300 .

[0018] It can be understood that the first flow channel 340 and the second flow channel 350 are evenly arranged on the connecting tube 300 and staggered with the air inlet 330. Figure 3 The arrangement of the first flow channel 340 and the second flow channel 350 is a preferred solution in this example. Specifically, the oil flows from the first flow channel 340 into the connecting chamber 210, flows back to the second flow channel 350, and is finally introduced into the nozzle 500, which keeps the connecting tube 300 warm and prevents the formation of hydrates that clog the device. There is no need to add an additional heating device to save energy.

[0019] A mixing chamber 510 is formed between the outer wall of the nozzle 500 and the inner wall of the mounting chamber 310 in this embodiment. One end of the mixing chamber 510 is connected to the upper joint 200 , and the other end of the mixing chamber 510 is connected to the air inlet 330 .

[0020] Preferably, the mixing chamber 510 is conical and is used to store casing gas. It is understandable that the shape of the mixing chamber 510 is not limited, and a uniform thickness is preferred.

[0021] Preferably, a gas flow meter is installed at the gas inlet to measure the casing gas sucked into the connecting tube 300.

[0022] Preferably, the connecting tube 300 also includes at least three sealing rings, the first sealing ring is embedded in the sealing groove opened on the outer wall of the nozzle 500, the outer ring of the first sealing ring abuts against the inner wall of the mounting cavity 310, the second sealing ring is embedded in the sealing groove opened on the outer wall of the pressure ring 400, the outer ring of the second sealing ring abuts against the inner wall of the mounting cavity 310, and the sealing rings of the third sealing ring are all embedded in the sealing groove opened on the outer wall of the connecting tube 300, and the outer ring of the third sealing ring abuts against the inner wall of the upper joint 200.

[0023] Preferably, the pressure chamber 320 is in the shape of a boss, with a smaller opening at one end of the pressure chamber 320 close to the nozzle 500 and a larger opening at one end of the pressure chamber 320 close to the upper joint 200. When the oil is sprayed out from the nozzle 500, the cross-section of the flow pipe through which it passes becomes larger and larger until it docks with the upper joint 200, thereby reducing the pressure of the oil.

[0024] like Figure 4As shown, the pressure ring 400 in this embodiment includes a limit plate 410 and a plurality of conduits 420, the plurality of conduits 420 are evenly arranged along the circumference of the limit plate 410, the length direction of each conduit 420 is parallel to the length direction of the flow pipe, the limit plate 410 is embedded in the mounting groove, one end of each conduit 420 is abutted against the lower joint 100, and the other end of each conduit 420 is abutted against the nozzle 500.

[0025] It is understandable that the shape of the pressure ring 400 is not limited, as long as it can connect the lower connector 100 and the first flow channel 340 , the lower connector 100 and the nozzle 500 , and firmly fix the nozzle 500 in the installation cavity 310 .

[0026] Among them, Figure 5 As shown, when there is no need to recover the casing gas, the casing gas recovery device is closed, and the crude oil can flow into the oil pipeline through the bypass branch pipe.

[0027] Workflow: Such as Figure 5 As shown, the upper joint 200 is connected with the oil inlet pipe of the oil pump, and the oil enters the lower joint 100 and is introduced into the nozzle 500 through the conduit 420. The oil is ejected from the nozzle 500 at high speed to generate local low pressure, and the casing enters the mixing chamber 510 from the air inlet 330, contacts with the oil, thereby being mixed with the oil, and passes through the pressure chamber 320 and the upper joint 200 with the oil until it is extracted. According to the gas flow meter, when the amount of casing gas is too large or too small, the size of the flow area can be adjusted by replacing nozzles 500 of different sizes. Specifically, the lower joint 100 is removed from the connecting tube 300, and the pressure ring 400 and the nozzle 500 are removed in turn. The nozzle 500 is replaced, one side of the pressure ring 400 is pressed against the nozzle 500, and then the lower joint 100 is installed on the connecting tube 300, and the other side of the pressure ring 400 is abutted against the lower joint 100, thereby completing the process of replacing the nozzle 500.

[0028] Different from the prior art, the present invention provides a detachable connection between the lower joint 100 and the connecting tube 300. After the pressure ring 400 and the nozzle 500 are disassembled, the pressure ring 400 and the nozzle 500 can be taken out and replaced with nozzles 500 of different calibers, thereby being suitable for oils with different flow rates. The casing gas entering the circulation pipeline from the air inlet 330 is mixed with the oil in the circulation pipeline and then discharged along with the oil, thereby achieving the effect of recycling the casing gas.

[0029] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For matters that are not described in detail in some embodiments, reference may be made to the description in other embodiments.

[0030] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations 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 subject to the attached claims.

Claims

1. A nozzle-replaceable and self-insulating ejector-type casing gas recovery device, characterized in that: It comprises a lower joint, an upper joint, a connecting tube, a pressure ring and a nozzle, one end of the connecting tube is detachably connected to the lower joint, the other end of the connecting tube is connected to the upper joint, the lower joint, the connecting tube and the upper joint sequentially form a circulation pipeline, the interior of the connecting tube is composed of a mounting chamber and a pressure chamber, the pressure ring and the nozzle are both built into the mounting chamber of the connecting tube, one side of the pressure ring abuts against the lower joint, the other side of the pressure ring abuts against one side of the nozzle, the pressure ring is connected to the nozzle, the other side of the nozzle abuts against the mounting chamber, the nozzle is connected to the pressure chamber, and the side wall of the connecting tube is provided with an air inlet connected to the circulation pipeline; The pressure chamber is in the shape of a boss, the opening of the end of the pressure chamber close to the nozzle is small, and the opening of the end of the pressure chamber close to the upper joint is large; The connecting tube is provided with a first flow channel and a second flow channel, one end of the first flow channel is connected to the interior of the lower joint, the other end of the first flow channel is connected to the connecting cavity formed between the connecting tube and the upper joint, one end of the second flow channel is connected to the connecting cavity, and the other end of the second flow channel is connected to the inlet of the nozzle; The pressure ring includes a limit plate and a plurality of conduits, the plurality of conduits are evenly arranged along the circumference of the limit plate, the length direction of each conduit is parallel to the length direction of the flow pipe, the limit plate is embedded in the installation cavity, one end of each conduit is abutted against the lower joint, and the other end of each conduit is abutted against the nozzle; The oil enters the lower joint and is guided into the nozzle through the conduit; When the amount of casing gas is too large or too small, the flow area can be adjusted by replacing nozzles of different sizes.

2. The nozzle-replaceable and self-insulating ejector-type casing gas recovery device according to claim 1, characterized in that: The upper joint is connected to the connecting tube by threaded connection, and the lower joint is connected to the connecting tube by threaded connection.

3. The nozzle-replaceable and self-insulating ejector-type casing gas recovery device according to claim 1, characterized in that: There are multiple first flow channels, and the multiple first flow channels are parallel to each other and arranged along the circumference of the connecting tube.

4. The nozzle-replaceable and self-insulating ejector-type casing gas recovery device according to claim 1, characterized in that: There are multiple second flow channels, and the multiple second flow channels are parallel to each other and arranged along the circumference of the connecting tube.

5. The nozzle-replaceable and self-insulating ejector-type casing gas recovery device according to claim 1, characterized in that: A mixing chamber is formed between the outer wall of the nozzle and the inner wall of the installation chamber, one end of the mixing chamber is communicated with the upper joint, and the other end of the mixing chamber is communicated with the air inlet.

6. The nozzle-replaceable and self-insulating ejector-type casing gas recovery device according to claim 5, characterized in that: The mixing chamber is conical and is used for storing casing gas.

7. The nozzle-replaceable and self-insulating ejector-type casing gas recovery device according to claim 1, characterized in that: The connecting tube also includes at least three sealing rings, the first sealing ring is embedded in the sealing groove opened on the outer wall of the nozzle, the outer ring of the first sealing ring abuts against the inner wall of the mounting cavity, the second sealing ring is embedded in the sealing groove opened on the outer wall of the pressure ring, the outer ring of the second sealing ring abuts against the inner wall of the mounting cavity, the inner ring of the third sealing ring is embedded in the sealing groove opened on the outer wall of the connecting tube, and the outer ring of the third sealing ring abuts against the inner wall of the upper joint.

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