A foam workover fluid generating device

Abstract

The present invention provides a foam well repair fluid generating device, comprising an aeration tank (18), a stirring barrel (10) located in the aeration tank (18), a jet fusion device (17) connected to the aeration tank (18), a liquid inlet pipe (4) connected to the stirring barrel (10), an ejector (9) located in the liquid inlet pipe (4), and a motor (6) and an air inlet pipe (2). The air inlet pipe (2) is connected to the ejector (9); the stirring shaft (11) in the stirring barrel (10) is arranged vertically and connected to the motor (6), and a plurality of stirring blades (15) are installed on the stirring shaft (11); the lower side wall of the stirring barrel (10) is connected to a plurality of liquid outlet pipes (16); the outlet of the jet fusion device (17) is connected to a microbubble liquid pipe (21). The present invention can quickly micronize the foam particle size, reduce the density of the foam liquid, prolong the half-life, and has a high production efficiency, and can well meet the technical requirements of low-pressure gas well repair operations.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas well repair operations, and in particular to a foam repair fluid generating device. Background Art

[0002] In the process of oil and gas exploration and development, due to long-term exploitation of oil and gas fields, the formation energy deficit has become increasingly serious, the formation pressure coefficient has dropped sharply, and the loss of well fluid has seriously affected the implementation of well repair operations.

[0003] At present, the main fluids used in low-pressure gas well repair operations are active water and foam fluids. The problems are: first, the loss of active water is large, which causes great damage to the formation, increases the complexity of the operation, and affects the recovery effect; second, although the use of foam fluid can reduce the pressure of the wellbore liquid column, thereby reducing formation leakage, the particle size of the foam fluid is generally large, and the half-life is short, only a few hours. The liquid phase in the fluid will quickly gather at the bottom of the well and leak into the formation. Generally, foam fluid can only be operated in a single process for a short time, and cannot achieve cyclic operation.

[0004] In the construction of low-pressure gas well repair operations, according to the relevant technical requirements of foam repair operations, the repair fluid needs to be mixed with air (or nitrogen) to perform low-density microbubble formation to form a low-density microbubble repair fluid. However, the current foam repair fluid generating devices generally have the defects of large and uneven foam particle size and short half-life. Therefore, how to improve the foam repair fluid generating device to micronize the foam particle size, reduce the foam liquid density, and extend the half-life to meet the technical requirements of low-pressure gas well repair operations has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In view of this, the present invention provides a foam workover fluid generating device, which can quickly micronize the foam particle size, reduce the foam liquid density, extend the half-life, have high production efficiency, and can well meet the technical requirements of low-pressure gas well workover operations.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A foam workover fluid generating device, comprising:

[0008] An aeration tank, wherein an outlet is provided on an upper side wall of the aeration tank;

[0009] A jet fusion device connected to the outlet of the aeration tank, wherein one end of the jet fusion device away from the aeration tank is connected to a microbubble liquid tube, and a control valve is provided on the microbubble liquid tube;

[0010] A cylindrical mixing barrel located in the aeration tank, wherein the upper side wall of the mixing barrel is connected to a liquid inlet pipe, the liquid inlet pipe passes through the side wall of the aeration tank, and the lower side wall of the mixing barrel is connected to a plurality of liquid outlet pipes evenly distributed around the axis of the mixing barrel, and a vertically arranged mixing shaft is provided inside the mixing barrel, and a plurality of groups of mixing blades generating downward thrust are installed on the mixing shaft;

[0011] A motor is installed above the aeration tank, and the upper end of the stirring shaft extends out of the aeration tank and is connected to the motor;

[0012] An air inlet pipe is located outside the aeration tank, one end of which penetrates through the side wall of the liquid inlet pipe and extends toward the mixing barrel along the axial direction of the liquid inlet pipe, and is connected to an ejector located inside the liquid inlet pipe near one end of the mixing barrel.

[0013] Preferably, in the above-mentioned foam well repair fluid generating device, the top cover of the mixing barrel is fixedly connected to the top of the aeration tank, a dynamic and static ring seal is arranged between the top cover of the mixing barrel and the mixing shaft, a support tube is installed on the top cover of the mixing barrel, the support tube is fixedly connected to a fat storage barrel installed on the mixing shaft, a bearing sleeved with the mixing shaft is installed in the fat storage barrel, and the motor is fixedly installed on the upper end of the support tube.

[0014] Preferably, in the above-mentioned foam workover fluid generating device, an overflow port is provided on the lower side wall of the support tube.

[0015] Preferably, in the above-mentioned foam workover fluid generating device, a centralizer is connected to the lower end of the stirring shaft.

[0016] Preferably, in the above-mentioned foam workover fluid generating device, a sewage pipe is provided at the bottom of the aeration tank, and a ball valve is provided on the sewage pipe.

[0017] Preferably, in the above-mentioned foam well repair fluid generating device, it also includes a box body covering the outside of the aeration tank and the jet fusion device, the liquid inlet pipe and the microbubble liquid pipe penetrate the side wall of the box body in the horizontal direction, and the support tube penetrates the top of the box body in the vertical direction.

[0018] Preferably, in the above-mentioned foam workover fluid generating device, the aeration tank and the housing are both installed on a skid-mounted base, and the middle portion of the jet fuser has a downward-facing sewage discharge flange opening.

[0019] Preferably, in the above-mentioned foam workover fluid generating device, the liquid outlet pipe forms an inclined angle of 30° to 60° with the radial direction of the mixing barrel, and the liquid outlet pipe is inclined relative to the radial direction of the mixing barrel and the rotation direction of the mixing blade.

[0020] Preferably, in the above-mentioned foam workover fluid generating device, a gas flow meter is installed on the gas inlet pipe, and a liquid flow meter is installed on the liquid inlet pipe.

[0021] Preferably, in the above-mentioned foam workover fluid generating device, the diameter of the aeration tank is 800 mm to 1000 mm, and the diameter of the stirring barrel is 200 mm to 300 mm.

[0022] According to the above technical scheme, in the foam well repair fluid generating device provided by the present invention, a stirring barrel is installed in the aeration tank, the inlet of the stirring barrel is connected to the liquid inlet pipe, an ejector is installed in the liquid inlet pipe, the air inlet pipe enters the liquid inlet pipe from the side wall of the liquid inlet pipe and is connected to the ejector, and at the same time, the outlet of the aeration tank is connected to the jet fusion device. When working, the motor drives the stirring shaft and stirring blades in the stirring barrel to rotate, the gas sent in by the air inlet pipe and the liquid sent in by the liquid inlet pipe are mixed in the ejector, the jet enters the stirring barrel, and enters the aeration tank through the liquid outlet pipe at the bottom of the stirring barrel. After jet mixing, stirring shearing, aeration pressure release and fusion, the foam particle size in the mixed liquid is smaller, and the foam liquid is mixed more evenly. Driven by pressure, the foam mixed liquid enters the jet fusion device from the outlet at the top of the aeration tank, and is further jet mixed and vortex sheared before being discharged from the microbubble liquid tube.

[0023] It can be seen from the above working process that the foam workover fluid generating device provided by the present invention enables multiple jetting, shearing, aeration slow release and fusion procedures to be completed in one process, thereby making the production process safer, simpler and more efficient, and can quickly micronize the foam particle size and reduce the density of the foam liquid, thereby meeting the requirements of low-pressure gas well workover operations for microbubble liquids of various densities. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of a foam well-repair fluid generating device provided in an embodiment of the present invention.

[0026] The markings in the figure are:

[0027] 1. Gas flowmeter; 2. Air inlet pipe; 3. Liquid flowmeter; 4. Liquid inlet pipe; 5. Drain pipe; 6. Motor; 7. Grease storage barrel; 8. Dynamic and static ring seals; 9. Ejector; 10. Mixing barrel; 11. Mixing shaft; 12. Centralizer; 13. Grease injection port; 14. Overflow port; 15. Mixing blade; 16. Liquid outlet pipe; 17. Jet fusion device; 18. Aeration tank; 19. Drain flange; 20. Box; 21. Microbubble liquid tube; 22. Control valve; 23. Skid-mounted base. DETAILED DESCRIPTION

[0028] For ease of understanding, the present invention is further described below in conjunction with the accompanying drawings.

[0029] See also Figure 1 , which is a schematic diagram of a foam well repair fluid generating device provided in an embodiment of the present invention, the foam well repair fluid generating device includes an aeration tank 18, a jet fusion device 17 connected to an outlet opened on the upper side wall of the aeration tank 18, a cylindrical stirring barrel 10 located in the aeration tank 18, a liquid inlet pipe 4 connected to the upper side wall of the stirring barrel 10, an ejector 9 located at one end of the liquid inlet pipe 4 close to the stirring barrel 10, a motor 6 installed above the aeration tank 18, and an air inlet pipe 2 located outside the aeration tank 18.

[0030] The liquid inlet pipe 4 passes through the side wall of the aeration tank 18, and one end of the air inlet pipe 2 passes through the side wall of the liquid inlet pipe 4 and extends toward the mixing barrel 10 along the axial direction of the liquid inlet pipe 4, and is connected to the ejector 9;

[0031] A vertically arranged stirring shaft 11 is provided inside the stirring barrel 10. The upper end of the stirring shaft 11 extends out of the aeration tank 18 and is connected to the motor 6. A plurality of stirring blades 15 generating downward thrust are installed on the stirring shaft 11. A plurality of liquid outlet pipes 16 evenly distributed around the axis of the stirring barrel 10 are connected to the lower side wall of the stirring barrel 10.

[0032] One end of the jet fusion device 17 away from the aeration tank 18 is connected to a microbubble liquid tube 21 , and a control valve 22 is provided on the microbubble liquid tube 21 .

[0033] The working principle of the foam well repairing fluid generating device provided by the present invention is:

[0034] The motor 6 drives the stirring shaft 11 and the stirring blade 15 to rotate, and the gas sent in by the air inlet pipe 2 and the liquid sent in by the liquid inlet pipe 4 are mixed in the ejector 9, and the jet enters the stirring barrel 10, and enters the aeration tank 18 through the liquid outlet pipe 16 at the bottom of the stirring barrel 10. After jet mixing, stirring shearing, aeration pressure release and fusion, the foam particle size in the mixed liquid is smaller, and the foam liquid is mixed more evenly. The foam mixed liquid enters the jet fusion device 17 from the outlet at the top of the aeration tank 18 under the pressure, and is further jet mixed and vortex sheared before being discharged from the microbubble liquid tube 21.

[0035] From the above working principle, it can be seen that the foam workover fluid generating device provided by the present invention enables multiple jetting, shearing, aeration slow release and fusion procedures to be completed in one process, thereby making the production process safer, simpler and more efficient, and can quickly micronize the foam particle size and reduce the density of the foam liquid, thereby meeting the requirements of low-pressure gas well workover operations for microbubble liquids of various densities.

[0036] In specific practical applications, the diameter of the aeration tank 18 is generally 800 mm to 1000 mm, the diameter of the mixing barrel 10 is generally 200 mm to 300 mm, and the control valve 22 may be a butterfly valve.

[0037] In order to facilitate the measurement and regulation of the air intake and liquid intake, a gas flow meter 1 is installed on the air intake pipe 2, and a liquid flow meter 3 is installed on the liquid intake pipe 4.

[0038] In order to facilitate the formation of a vortex in the aeration tank 18 when the liquid is discharged to facilitate the fusion of the foam liquid, the liquid outlet pipe 16 can be designed to have an inclined angle of 30° to 60° with the radial direction of the mixing barrel 10, and the liquid outlet pipe 16 is inclined relative to the radial direction of the mixing barrel 10 and the rotation direction of the mixing blade 15.

[0039] like Figure 1 As shown, in this embodiment, the top cover of the mixing barrel 10 is fixedly connected to the top of the aeration tank 18, a dynamic and static ring seal 8 is provided between the top cover of the mixing barrel 10 and the mixing shaft 11, a support cylinder (not marked in the figure) is installed on the top cover of the mixing barrel 10, the support cylinder is fixedly connected to the fat storage barrel 7 installed on the mixing shaft 11, a bearing (not marked in the figure) sleeved with the mixing shaft 11 is installed in the fat storage barrel 7, and the motor 6 is fixedly installed on the upper end of the support cylinder.

[0040] An overflow port 14 is provided on the lower side wall of the support tube. When the pressure in the aeration tank 18 is too high and the liquid overcomes the sealing resistance of the dynamic and static ring seals 8 and leaks from between the dynamic and static rings, the liquid can be discharged from the overflow port 14 to release the pressure.

[0041] In order to facilitate the replenishment of grease, a grease injection port 13 is provided in the middle of the grease storage barrel 7 .

[0042] In order to ensure the concentricity of the stirring shaft 11 when it rotates at high speed, a centralizer 12 is connected to the lower end of the stirring shaft 11 in this embodiment.

[0043] In order to facilitate the emptying of the residual liquid in the aeration tank 18 , in this embodiment, a sewage pipe 5 is provided at the bottom of the aeration tank 18 , and a ball valve (not shown in the figure) is provided on the sewage pipe 5 .

[0044] In order to protect the various parts of the foam workover fluid generating device as a whole, a box 20 can be placed outside the aeration tank 18 and the jet fusion device 17, such as Figure 1As shown, the liquid inlet tube 4 and the microbubble liquid tube 21 penetrate the side wall of the box body 20 in the horizontal direction, and the support tube penetrates the top of the box body 20 in the vertical direction, so that the box body 20 can play a role in fixing and supporting the components passing through.

[0045] In specific practical applications, the aeration tank 18 and the box body 20 can be installed on the skid-mounted base 23. In order to facilitate sewage discharge and cleaning, a downward sewage discharge flange 19 can be provided in the middle of the jet fusion device 17, such as Figure 1 shown.

[0046] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to the embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A foam workover fluid generating device, characterized in that: include: An aeration tank (18), wherein an outlet is provided on an upper side wall of the aeration tank (18); a jet fusion device (17) connected to the outlet of the aeration tank (18), wherein one end of the jet fusion device (17) away from the aeration tank (18) is connected to a microbubble liquid tube (21), and a control valve (22) is provided on the microbubble liquid tube (21); A cylindrical stirring barrel (10) is located in the aeration tank (18), the upper side wall of the stirring barrel (10) is connected to a liquid inlet pipe (4), the liquid inlet pipe (4) passes through the side wall of the aeration tank (18), the lower side wall of the stirring barrel (10) is connected to a plurality of liquid outlet pipes (16) evenly distributed around the axis of the stirring barrel (10), a vertically arranged stirring shaft (11) is provided inside the stirring barrel (10), and a plurality of groups of stirring blades (15) generating downward thrust are installed on the stirring shaft (11); A motor (6) is installed above the aeration tank (18), and the upper end of the stirring shaft (11) extends out of the aeration tank (18) and is connected to the motor (6); An air inlet pipe (2) is located outside the aeration tank (18), one end of which penetrates through the side wall of the liquid inlet pipe (4) and extends toward the mixing barrel (10) along the axial direction of the liquid inlet pipe (4), and is connected to an ejector (9) located inside the liquid inlet pipe (4) at one end close to the mixing barrel (10).

2. The foam well-serving fluid generating device according to claim 1, characterized in that: The top cover of the mixing barrel (10) is fixedly connected to the top of the aeration tank (18), a dynamic and static ring seal (8) is provided between the top cover of the mixing barrel (10) and the mixing shaft (11), a support cylinder is installed on the top cover of the mixing barrel (10), the support cylinder is fixedly connected to a fat storage barrel (7) installed on the mixing shaft (11), a bearing sleeved with the mixing shaft (11) is installed in the fat storage barrel (7), and the motor (6) is fixedly installed on the upper end of the support cylinder.

3. The foam well repair fluid generating device according to claim 2, characterized in that: An overflow port (14) is provided on the lower side wall of the support tube.

4. The foam well repair fluid generating device according to claim 3, characterized in that: The lower end of the stirring shaft (11) is connected to a centralizer (12).

5. The foam well repair fluid generating device according to claim 4, characterized in that: A sewage pipe (5) is provided at the bottom of the aeration tank (18), and a ball valve is provided on the sewage pipe (5).

6. The foam well repair fluid generating device according to claim 5, characterized in that: It also includes a box body (20) covering the outside of the aeration tank (18) and the jet fusion device (17), the liquid inlet pipe (4) and the microbubble liquid pipe (21) penetrate the side wall of the box body (20) in the horizontal direction, and the support tube penetrates the top of the box body (20) in the vertical direction.

7. The foam well repair fluid generating device according to claim 6, characterized in that: The aeration tank (18) and the box body (20) are both installed on a skid-mounted base (23), and the middle part of the jet fusion device (17) has a downward-facing sewage discharge flange port (19).

8. The foam workover fluid generating device according to any one of claims 1 to 7, characterized in that: The liquid outlet pipe (16) forms an inclined angle of 30° to 60° with the radial direction of the stirring barrel (10), and the liquid outlet pipe (16) is inclined relative to the radial direction of the stirring barrel (10) and the rotation direction of the stirring blade (15).

9. The foam well-serving fluid generating device according to claim 8, characterized in that: A gas flow meter (1) is installed on the air inlet pipe (2), and a liquid flow meter (3) is installed on the liquid inlet pipe (4).

10. The foam well-serving fluid generating device according to claim 9, characterized in that: The diameter of the aeration tank (18) is 800 mm to 1000 mm, and the diameter of the stirring barrel (10) is 200 mm to 300 mm.

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