A steam injection wellhead filtration device

Abstract

This utility model provides a steam injection wellhead filtration device, relating to the field of heavy oil well production technology. The steam injection wellhead filtration device includes a filter cylinder and a screen pipe installed inside the filter cylinder. The screen pipe includes slotted sections and perforated sections. The slotted sections have a plurality of screen slots, and the perforated sections have a plurality of screen holes. A partition is provided inside the filter cylinder, dividing it into a first filter chamber and a second filter chamber. The upper end of the first filter chamber has a steam injection channel, and the end of the second filter chamber away from the screen pipe has a steam inlet channel. A through hole is provided on the partition. The screen pipe passes through the through hole so that the slotted sections and the perforated sections are located in the first filter chamber and the second filter chamber, respectively. By setting two filter chambers and a screen pipe passing through them, mechanical impurities entrained in the steam can be effectively removed, ensuring the cleanliness of the steam injected into the well. This prevents mechanical impurities from entering the oil pump during oil extraction, ensuring the normal operation of the oil pump and effectively reducing pump jamming failures.

Description

Technical Field

[0001] This utility model relates to the field of heavy oil well production technology, and in particular to a wellhead filtration device for steam injection wells. Background Technology

[0002] In heavy oil development, steam injection is a commonly used method. Steam is injected into the downhole oil layer to heat the formation crude oil, reducing its viscosity and making it more fluid. The oil is then pumped to the surface. To minimize heat loss, steam injection and pumping are usually done in a single run. However, during steam injection, mechanical impurities such as welding slag and rust present in the surface pipeline are injected downhole with the steam. These impurities can cause pump jamming during pumping, requiring pump inspection, increasing operating costs, causing significant heat loss, drastically reducing oil production, and putting pressure on environmental protection efforts. Utility Model Content

[0003] To solve the above problems, this utility model provides a steam injection wellhead filtration device.

[0004] The technical solution adopted by this utility model is: a steam injection wellhead filtration device, including a filter cylinder and a screen pipe installed inside the filter cylinder. The screen pipe includes a slotted section and a perforated section. The slotted section has a plurality of screen slots, and the perforated section has a plurality of screen holes. A partition is provided inside the filter cylinder, which divides the filter cylinder into a first filter chamber and a second filter chamber. The upper end of the first filter chamber is provided with a steam injection channel, and the end of the second filter chamber away from the screen pipe is provided with a steam inlet channel. A through hole is provided on the partition. The screen pipe passes through the through hole so that the slotted section and the perforated section are located in the first filter chamber and the second filter chamber, respectively.

[0005] In this application,

[0006] Preferably, the width of the sieve slot is greater than the diameter of the sieve hole.

[0007] Preferably, the filter cartridge includes a first cylinder and a second cylinder, which are detachably connected.

[0008] Furthermore, the partition is fixed to the first cylinder or the second cylinder.

[0009] Preferably, a sieve plate is provided at one end of the sieve tube near the steam inlet channel.

[0010] Preferably, the through hole is an eccentric conical hole, and the diameter of the hole near the first filter chamber is larger than the diameter of the hole near the second filter chamber.

[0011] Preferably, the through hole, the screen tube, and the steam inlet channel are located on the same axis, while the screen tube and the filter cartridge are not on the same axis.

[0012] Preferably, the first filter chamber is provided with an end connector, the end connector is detachably connected to a plug, and the screen tube is installed on the plug.

[0013] Furthermore, the end of the plug away from the screen tube is provided with a disassembly structure.

[0014] Preferably, the bottom of the first filter chamber and the second filter chamber are provided with slag removal channels, and the slag removal channels are provided with slag removal plugs.

[0015] Beneficial effects:

[0016] When this steam injection wellhead filtration device is in use, steam enters the second filter chamber from the steam inlet channel. The steam then enters the screen tube through the screen holes. Large mechanical impurities cannot pass through the screen holes and are retained in the second filter chamber. After entering the screen tube, the steam flows through the screen slots on the screen tube into the second filter chamber. At the same time, the overall flow area of ​​the screen slots is larger than the overall flow area of ​​the screen holes, which reduces the steam flow velocity. Small mechanical impurities fall into the first filter chamber. The clean steam finally enters the steam injection channel and is injected into the well. This prevents mechanical impurities from entering the oil pump during oil extraction, ensuring the normal operation of the oil pump and effectively reducing pump jamming failures. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of a steam injection wellhead filtration device according to the present invention.

[0018] exist Figure 1 middle,

[0019] 1. Plug; 2. End connector; 3. First cylinder; 4. Steam injection channel; 5. Slotted section; 6. Screen slot; 7. Baffle plate; 8. Screen tube; 9. Screen hole; 10. Second cylinder; 11. Screen plate; 12. Steam inlet channel; 13. Hole section; 14. First filter chamber; 15. Slag removal blockage; 16. Slag removal channel; 17. Second filter chamber. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0021] This utility model provides a steam injection wellhead filtration device, such as... Figure 1As shown, the filter includes a filter cylinder and a screen tube 8 installed inside the filter cylinder. The screen tube 8 includes a slotted section 5 and a perforated section 13. The slotted section 5 has a plurality of screen slots 6, and the perforated section 13 has a plurality of screen holes 9. A partition 7 is provided inside the filter cylinder, which divides the filter cylinder into a first filter chamber 14 and a second filter chamber 17. The upper end of the first filter chamber 14 is provided with a steam injection channel 4, and the end of the second filter chamber 17 away from the screen tube 8 is provided with a steam inlet channel 12. The partition 7 is provided with a through hole. The screen tube 8 passes through the through hole so that the slotted section 5 and the perforated section 13 are located in the first filter chamber 14 and the second filter chamber 17, respectively.

[0022] When the steam injection wellhead filtration device is in use, steam enters the second filter chamber 17 from the steam inlet channel 12, and then enters the screen tube 8 through the screen holes 9. Large mechanical impurities cannot pass through the screen holes 9 and are retained in the second filter chamber 17. After entering the screen tube 8, the steam flows through the screen slots 6 on the screen tube 8 and enters the first filter chamber 14. At the same time, the overall flow area of ​​the screen slots 6 is larger than the overall flow area of ​​the screen holes 9, which reduces the steam flow velocity. Small mechanical impurities fall into the first filter chamber 14, and the clean steam finally enters the steam injection channel 4 and is injected into the well. This prevents mechanical impurities from entering the oil pump during oil extraction, ensures the normal operation of the oil pump, and effectively reduces the risk of oil pump jamming.

[0023] In one embodiment of this utility model, the width of the sieve slot 6 is greater than the diameter of the sieve hole 9, which further ensures that the overall flow area of ​​the sieve slot 6 is greater than the overall flow area of ​​the sieve hole 9, reduces the flow rate of steam out of the sieve tube 8, and ensures that small mechanical impurities fall into the first filter chamber 14.

[0024] In one embodiment of the present invention, the filter cartridge includes a first cylinder 3 and a second cylinder 10, which are threaded together. By dividing the filter cartridge into a first cylinder 3 and a second cylinder 10 that can be detachably connected, it is convenient to install and fix the partition 7, and also convenient to clean and maintain the inside of the filter cartridge.

[0025] In a further embodiment of this utility model, the partition 7 can be fixedly welded to the first cylinder 3 or to the second cylinder 10.

[0026] In one embodiment of this utility model, a sieve plate 11 is provided at one end of the sieve tube 8 near the steam inlet channel 12. By increasing the sieve plate 11, the steam flow area can be increased, thereby improving the steam flow efficiency.

[0027] In one embodiment of this utility model, the through hole is an eccentric conical hole, and the diameter of the hole near the first filter chamber 14 is larger than the diameter of the hole near the second filter chamber 17. In this way, the partition plate 7 and the screen tube 8 have a self-cleaning effect after they are combined. That is, the annular gap between the conical hole on the partition plate 7 and the screen tube 8, the gap on the side near the first filter chamber 14 is larger than the gap on the side near the second filter chamber 17. When a small amount of steam enters the first filter chamber 14 through the annular gap from the second filter chamber 17, any mechanical impurities that may be carried can enter and be discharged.

[0028] In one embodiment of this utility model, the through hole, the screen tube 8 and the steam inlet channel 12 are located on the same axis, which facilitates the flow of steam. The axis of the screen tube 8 is above the axis of the filter cylinder. By setting the screen tube 8 and the filter cylinder not on the same axis, the screen tube 8 is far away from the accumulation surface of impurities in the filter cylinder, which prevents the falling impurities from blocking the screen hole 9 again under the drive of steam, thus ensuring the flow of steam.

[0029] In one embodiment of this utility model, the first filter chamber 14 is provided with an end connector 2, and a plug 1 is threadedly connected to the end connector 2. The screen tube 8 is installed on the plug 1. The end connector 2 and the plug 1 are detachably connected, which facilitates the disassembly, assembly, and cleaning of the screen tube 8. Of course, the screen tube 8 and the plug 1 can also be detachably connected by a threaded connection, which facilitates the individual replacement and maintenance of the screen tube 8; of course, the screen tube 8 and the plug 1 can also be fixedly connected by welding or other methods. This application does not specifically limit this.

[0030] In a further embodiment of this utility model, the end of the plug 1 away from the screen tube 8 is provided with a disassembly structure. This facilitates the disassembly and assembly of the plug 1. The disassembly structure is preferably a square protrusion. Of course, in other embodiments, the disassembly structure can also be other varied shapes, as long as it is convenient for the plug 1 to be disassembled under force. This application does not limit this.

[0031] In a further embodiment of this utility model, the bottom of the first filter chamber 14 and the second filter chamber 17 are provided with a sludge removal channel 16, and the sludge removal channel 16 is provided with a sludge removal plug 15. In this way, the first filter chamber 14 and the second filter chamber 17 can be cleaned separately without disassembling the entire filter device for cleaning, thus reducing the difficulty of cleaning impurities.

[0032] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A steam injection wellhead filtration device, characterized in that, Includes a filter cartridge and a screen tube (8) installed inside the filter cartridge. in, The sieve tube (8) includes a slotted section (5) and a perforated section (13). The slotted section (5) is provided with a plurality of sieve slots (6), and the perforated section (13) is provided with a plurality of sieve holes (9). The filter cartridge is provided with a partition (7), which divides the filter cartridge into a first filter chamber (14) and a second filter chamber (17). The first filter chamber (14) is provided with a steam injection channel (4) at its upper end, and the second filter chamber (17) is provided with a steam inlet channel (12) at its end away from the screen tube (8). The partition (7) is provided with through holes; The sieve tube (8) extends through the through hole so that the slit segment (5) and the hole segment (13) are located in the first filter chamber (14) and the second filter chamber (17), respectively.

2. The steam injection wellhead filtration device according to claim 1, characterized in that, The width of the sieve slot (6) is greater than the diameter of the sieve hole (9).

3. The steam injection wellhead filtration device according to claim 1, characterized in that, The filter cartridge includes a first cylinder (3) and a second cylinder (10), which are detachably connected.

4. A steam injection wellhead filtration device according to claim 3, characterized in that, The partition (7) is fixed on the first cylinder (3) or the second cylinder (10).

5. A steam injection wellhead filtration device according to claim 1, characterized in that, The screen tube (8) has a screen plate (11) at one end near the steam inlet channel (12).

6. A steam injection wellhead filtration device according to claim 1, characterized in that, The through hole is an eccentric conical hole, and the diameter of the hole near the first filter chamber (14) is larger than the diameter of the hole near the second filter chamber (17).

7. A steam injection wellhead filtration device according to claim 1, characterized in that, The through hole, the screen tube (8), and the steam inlet channel (12) are located on the same axis, while the screen tube (8) and the filter cartridge are not on the same axis.

8. A steam injection wellhead filtration device according to claim 1, characterized in that, The first filter chamber (14) is provided with an end connector (2), and the end connector (2) is detachably connected to a plug (1), and the screen tube (8) is installed on the plug (1).

9. A steam injection wellhead filtration device according to claim 8, characterized in that, The end of the plug (1) away from the screen tube (8) is provided with a disassembly structure.

10. A steam injection wellhead filtration device according to claim 1, characterized in that, The bottom of the first filter chamber (14) and the second filter chamber (17) is provided with a slag removal channel (16), and the slag removal channel (16) is provided with a slag removal plug (15).

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