Underground intelligent throttler

Abstract

The underground intelligent throttler comprises an anchoring expansion sealing short section, a throttling air nozzle assembly, an electric control assembly, a pressure sensor and a high-pressure microphone, the upper end of the throttling air nozzle assembly is in threaded connection with the anchoring expansion sealing short section, a sealing ring is arranged at the joint of the upper end of the throttling air nozzle assembly and the anchoring expansion sealing short section, and the lower end of the throttling air nozzle assembly is connected with the electric control assembly; the electric control assembly is connected with the pressure sensor and the high-pressure microphone. The throttling air nozzle assembly is provided with three throttling air nozzles with different nozzle diameters, so that three-stage throttling can be realized, the well descending frequency is reduced, the production efficiency is improved, and the construction operation risk is reduced; the pressure sensor can be used for automatically adjusting the throttling air tap according to the bottom hole pressure, and the high-pressure microphone can be used for receiving wellhead sound wave signals for real-time adjustment, so that the requirement of real-time production adjustment is met.

Description

Technical Field

[0001] The invention relates to the technical field of downhole throttling in gas well development, and in particular to a downhole intelligent throttling device. Background Art

[0002] In order to ensure the stable production of natural gas wells, it is necessary to place downhole throttles for throttling and pressure reduction. Traditional mechanical downhole throttles need to be salvaged and replaced with throttling nozzles before being placed downhole. The salvage operation is difficult, often fails, and the cost is high. Storage-type downhole throttles can only be adjusted according to parameters such as pressure and temperature downhole, and cannot meet the requirements of real-time production adjustment. Electromagnetic downhole wireless transmission downhole throttles require string resistance matching. The downhole mandrel and downhole centralizer are first lowered into the throttling layer along with the oil pipe. The operation cost is high and cannot be applied to gas wells that have been put into production. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an underground intelligent throttle to overcome the shortcomings of the prior art.

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: an underground intelligent throttle, comprising an anchor expansion seal nipple, a throttle air nozzle assembly, an electric control assembly, a pressure sensor and a high-pressure microphone, wherein the upper end of the throttle air nozzle assembly is threadedly connected to the anchor expansion seal nipple and a sealing ring is arranged at the connection, the lower end of the throttle air nozzle assembly is connected to the electric control assembly, and the electric control assembly is respectively connected to the pressure sensor and the high-pressure microphone; The throttle air nozzle assembly includes a transmission sleeve, an air nozzle sleeve, a connecting pipe and a transmission shaft. The transmission sleeve is slidably connected to the connecting pipe. One side of the transmission sleeve is cylindrical, and a rectangular notch is provided on the other side. A threaded hole is provided on the side of the transmission sleeve where the rectangular notch is provided. The transmission sleeve is threadedly connected to the transmission shaft. The transmission shaft is connected to the electronic control assembly. The air nozzle sleeve is connected to the connecting pipe by screws. A plurality of flow holes are evenly provided on the outer wall of the air nozzle sleeve along the circumferential direction and arranged axially. At least two throttle air nozzles are provided in the inner hole of the air nozzle sleeve. The diameter of the throttle air nozzle gradually decreases along the direction approaching the connecting pipe. The throttle air nozzle with the smallest diameter is connected to a screw plug. Isolation rings are provided between the throttle air nozzles and between the throttle air nozzle and the screw plug. The isolation rings are provided with flow holes corresponding to the flow holes of the air nozzle sleeve.

[0005] There are three throttling air nozzles and isolating rings, and there are three groups of flow holes in the air nozzle sliding sleeve, with four holes in each group.

[0006] The outer wall and the inner hole of the air nozzle sliding sleeve are each provided with three sealing grooves which are arranged alternately.

[0007] The two ends of the transmission shaft are respectively sleeved with a straightening ring and a rolling bearing.

[0008] The electric control assembly includes a motor, a circuit board and a battery which are connected in sequence from top to bottom, and the pressure sensor is installed at the lower end of the motor.

[0009] The battery is threadedly connected to the high-voltage microphone, and a sealing plug is arranged between the battery and the high-voltage microphone.

[0010] A microphone shield is arranged outside the high-voltage microphone, and the microphone shield is provided with three groups of waist-shaped grooves evenly distributed on the circumference.

[0011] Beneficial effects of the present invention: 1. The present invention uses three throttling air nozzles with different nozzle diameters to achieve three-level throttling by dropping them into the well at one time, thus reducing the number of times of going into the well, improving production efficiency, and reducing construction operation risks; 2. The present invention can not only automatically adjust the throttle valve according to the bottom hole pressure, but also can adjust in real time through acoustic wave wireless communication to achieve the requirement of real-time production adjustment; 3. The air nozzle sleeve is completely in the underground high-pressure gas environment, which always ensures the pressure balance and reduces the requirements for the motor output torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the sound wave collection work of the present invention; Figure 3 It is a structural schematic diagram of the throttle nozzle assembly of the present invention; Figure 4 is a cross-sectional view of a throttle nozzle assembly of the present invention; Figure 5 is a cross-sectional view of the transmission sleeve of the present invention; In the figure: 1. anchor expansion seal short section; 2. throttle air nozzle assembly; 201. transmission sleeve; 202. air nozzle sleeve; 203. connecting pipe; 204. transmission shaft; 205. throttle air nozzle; 206. screw plug; 207. isolation ring; 208. screw; 209. straightening ring; 2010. rolling bearing; 2011. sealing groove; 3. electronic control assembly; 301. motor; 302. circuit board; 303. battery; 4. pressure sensor; 5. high-pressure microphone; 6. sealing ring; 7. sealing plug; 8. microphone shield; 9. high-pressure liquid level tester; 10. oil pipe. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0014] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments. Example

[0015] like Figures 1 to 5 As shown, the present invention provides a downhole intelligent throttle, comprising an anchoring expansion seal nipple 1, a throttling air nozzle assembly 2, an electric control assembly 3, a pressure sensor 4 and a high-pressure microphone 5, wherein the upper end of the throttling air nozzle assembly 2 is threadedly connected to the anchoring expansion seal nipple 1 and a sealing ring 6 is arranged at the connection, the lower end of the throttling air nozzle assembly 2 is connected to the electric control assembly 3, and the electric control assembly 3 is respectively connected to the pressure sensor and the high-pressure microphone 5; The throttle air nozzle assembly includes a transmission sleeve 201, an air nozzle sleeve 202, a connecting pipe 203 and a transmission shaft 204. The transmission sleeve 201 is slidably connected to the connecting pipe 203. One side of the transmission sleeve 201 is cylindrical, and a rectangular notch is provided on the other side. A threaded hole is provided on the side of the transmission sleeve 201 where the rectangular notch is provided. The transmission sleeve 201 is threadedly connected to the transmission shaft 204. The transmission shaft 204 is connected to the electronic control assembly 3. The air nozzle sleeve 201 is connected to the connecting pipe 203 by screws 208. The outer wall of the air nozzle sleeve 202 is provided with a plurality of flow holes evenly arranged in the circumferential direction and arranged in the axial direction. The inner hole of the air nozzle sleeve 202 is provided with at least two throttling air nozzles 205. The diameter of the throttling air nozzle 205 gradually decreases in the direction approaching the connecting pipe 203. The throttling air nozzle 205 with the smallest diameter is connected to the screw plug 206. Isolation rings 207 are provided between the throttling air nozzles 205 and between the throttling air nozzles 205 and the screw plug 206. The isolation rings 207 are provided with flow holes corresponding to the flow holes of the air nozzle sleeve 202.

[0016] In this embodiment, there are three throttling air nozzles 205 and three isolating rings 207 , and the air nozzle sleeve 201 has three groups of flow holes, with four holes in each group.

[0017] The cylindrical side of the transmission sleeve 201 can cooperate with the air nozzle sleeve 202 to achieve sealing. The side with a rectangular notch can both pass the airflow and ensure the relative position with the connecting pipe 203, so that the transmission sleeve 201 can only move axially. The three throttle air nozzles 205 are installed in the holes of the air nozzle sleeve 202 from left to right according to the size of the nozzles, isolated by the isolation ring 207 and fixed by the screw plug 206. During assembly, ensure that the flow hole of the isolation ring 207 corresponds to the flow hole of the air nozzle sleeve 202. The underground gas first passes through the flow hole of the air nozzle sleeve 202, passes through the flow hole of the isolation ring 207, and finally passes through the throttle air nozzle 205 to achieve the purpose of throttling. In the initial state, the transmission sleeve 201 covers the two groups of flow holes on the left end of the gas nozzle sleeve 201. The underground gas can only pass through the flow holes on the rightmost end of the gas nozzle sleeve 201 and flow through the throttling gas nozzle 205 with the smallest nozzle diameter to achieve the first level of throttling. The transmission sleeve 201 slides to the left to expose the flow holes of the gas nozzle sleeve 201 in turn, thereby achieving the second and third levels of throttling.

[0018] Specifically, in order to ensure that the gas does not leak out and can only flow out through the central hole of the throttling nozzle 205, the outer wall and the inner hole of the nozzle sleeve 201 are each provided with three sealing grooves 2011 and are arranged alternately.

[0019] Specifically, in order to ensure that the transmission shaft 204 and the connecting pipe 203 are coaxial, a stabilizing ring 209 and a rolling bearing 2010 are respectively sleeved on both ends of the transmission shaft 204 .

[0020] Specifically, the electric control component 3 includes a motor 301 , a circuit board 302 and a battery 303 connected in sequence from top to bottom, and the pressure sensor 4 is installed at the lower end of the motor 301 .

[0021] Specifically, the lower end of the battery 303 is threadedly connected to the high-voltage microphone 5 , a signal line of the high-voltage microphone 5 passes through the battery 303 and is connected to the circuit board 302 , and a sealing plug 7 is provided between the battery 303 and the high-voltage microphone 5 .

[0022] Specifically, a microphone shield 8 is provided outside the high-voltage microphone 5, and the microphone shield 8 is provided with three groups of waist-shaped grooves evenly distributed around the circumference. The microphone shield 8 protects the high-voltage microphone 5, and the sound wave signal can be received by the high-voltage microphone 5 through the waist-shaped grooves.

[0023] Working principle: The pressure sensor 4 installed at the lower end of the motor 301 can measure the bottom hole pressure in real time. By pre-setting the bottom hole flow pressure and the throttling air nozzle 205 nozzle diameter control strategy comparison table, when the bottom hole flow pressure is tested to reach the set value, the motor 301 starts to work and adjusts the throttling air nozzle 205. After reaching the target position, the motor 301 stops working, thereby realizing the function of automatically adjusting the throttling air nozzle 205. When it is necessary to adjust the throttle nozzle 205 in real time on the ground, a high-pressure liquid level tester 9 is installed at the wellhead of the oil pipe 10. The high-pressure liquid level tester 9 fires more than three acoustic pulse signals at equal intervals of not less than 20S. The acoustic pulse signals pass through the oil pipe 10, the central channel of the anchor expansion seal short section 1, and the throttle nozzle 205 to reach the lower end of the device and are received by the high-pressure microphone 5. After receiving more than three equally spaced acoustic pulses, the motor 301 starts working to adjust the throttle nozzle 205. After reaching the target position, the motor 301 stops working, thereby realizing the function of adjusting the throttle nozzle 205 in real time through acoustic wave wireless communication.

[0024] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A downhole intelligent throttle, characterized in that: It comprises an anchor expansion seal nipple (1), a throttle air nozzle assembly (2), an electric control assembly (3), a pressure sensor (4) and a high-pressure microphone (5), wherein the upper end of the throttle air nozzle assembly (2) is threadedly connected to the anchor expansion seal nipple (1) and a sealing ring (6) is provided at the connection, the lower end of the throttle air nozzle assembly (2) is connected to the electric control assembly (3), and the electric control assembly (3) is respectively connected to the pressure sensor and (4) the high-pressure microphone (5); The throttle air nozzle assembly comprises a transmission sleeve (201), an air nozzle sleeve (202), a connecting pipe (203) and a transmission shaft (204); the transmission sleeve (201) is slidably connected to the connecting pipe (203); one side of the transmission sleeve (201) is cylindrical, and the other side is provided with a through rectangular notch; a threaded hole is provided on the side of the transmission sleeve (201) where the rectangular notch is provided; the transmission sleeve (201) is threadedly connected to the transmission shaft (204); the transmission shaft (204) is connected to the electronic control assembly (3); the air nozzle sleeve (201) is connected to the connecting pipe (203) by screws (208 ), the outer wall of the air nozzle sleeve (202) is uniformly provided with a plurality of flow holes along the circumferential direction and arranged in an axial direction, the inner hole of the air nozzle sleeve (202) is provided with at least two throttling air nozzles (205), the diameter of the throttling air nozzles (205) gradually decreases in the direction approaching the connecting pipe (203), the throttling air nozzle (205) with the smallest diameter is connected to the screw plug (206), and isolation rings (207) are provided between the throttling air nozzles (205) and between the throttling air nozzles (205) and the screw plug (206), and the isolation rings (207) are provided with flow holes corresponding to the flow holes of the air nozzle sleeve (202).

2. A downhole intelligent throttle according to claim 1, characterized in that: There are three throttling air nozzles (205) and three isolating rings (207), and the air nozzle sliding sleeve (201) has three groups of flow holes, with four holes in each group.

3. The underground intelligent throttle according to claim 2, characterized in that: The outer wall and inner hole of the air nozzle sliding sleeve (201) are each provided with three sealing grooves (2011) which are arranged in a staggered manner.

4. The underground intelligent throttle according to claim 1, characterized in that: A straightening ring (209) and a rolling bearing (2010) are respectively sleeved on both ends of the transmission shaft (204).

5. The underground intelligent throttle according to claim 1, characterized in that: The electric control component (3) comprises a motor (301), a circuit board (302) and a battery (303) which are connected in sequence from top to bottom, and the pressure sensor (4) is mounted at the lower end of the motor (301).

6. A downhole intelligent throttle according to claim 5, characterized in that: The battery (303) is threadedly connected to the high-voltage microphone (5), and a sealing plug (7) is provided between the battery (303) and the high-voltage microphone (5).

7. The underground intelligent throttle according to claim 1, characterized in that: A microphone shield (8) is provided outside the high-voltage microphone (5), and the microphone shield (8) is provided with three groups of waist-shaped grooves evenly distributed around the circumference.

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