Production device of oil well acid fracturing temporary plugging agent

Abstract

The utility model relates to the technical field of acidizing and fracturing temporary plugging agent preparation, and discloses an oil well acidizing and fracturing temporary plugging agent production device which comprises a reaction tank, two machine barrels are integrally formed at the lower end of the side wall of the reaction tank, and one side of each machine barrel is provided with an extruding and pushing piston plate; and a driving mechanism for driving the two extruding and pushing piston plates to move is installed in the reaction tank, backflow pipes are fixedly inserted into the side walls of the two machine barrels, the upper end of the outer side wall of the reaction tank is fixedly sleeved with an annular initiator storage container, and taper sleeves are integrally formed at the lower ends of the annular initiator storage container. By means of external circulation of the emulsion and uniform dripping of the initiator, the initiator and the emulsion are rapidly mixed, the mixing efficiency of the initiator and the emulsion is improved, the mixing time needed by the initiator and the emulsion is shortened, meanwhile, in the external circulation process, the emulsion can fully absorb heat, and the heat transfer efficiency is improved. And the temperature uniformity of the emulsion is improved.

Description

Technical Field

[0001] The present application relates to the technical field of preparation of temporary plugging agents for acid fracturing, and in particular to a production device for temporary plugging agents for acid fracturing of oil wells. Background Art

[0002] Oil well acid fracturing temporary plugging agent is a chemical additive used in oilfield acid fracturing operations. Temporary plugging agents can plug holes of various sizes and bridge perforations, fractures and holes. Over time, these temporary plugging agents need to degrade or dissolve in the formation fluid.

[0003] At present, in the production process of diquaternary ammonium salt temporary plugging agent, 1,4-dichloro-2-butene, triethylamine, copper chloride, and sodium sulfite need to be stirred, heated and refluxed under nitrogen protection, and filtered and distilled under reduced pressure to obtain a viscous intermediate, and then recrystallized with ethyl acetate 2-3 times to obtain a white crystalline diquaternary ammonium salt, and the white crystals are stirred with butenedioic acid, allyl naphthalene, vinyl pyridine, OP-10 and water to a uniform emulsion, and the pH value is adjusted, and then an initiator is added to the emulsion, and half of the initiator is added dropwise to the emulsion, stirred and heated to 50-55°C, kept warm for 2-3h, and continued to heat to 60-65°C, ethylene glycol dimethacrylate is added, stirred evenly, the remaining initiator is added, stirred for 2-3h, a polymerization solution is obtained, and finally the obtained polymerization solution is granulated to obtain a finished acid fracturing temporary plugging agent;

[0004] When adding the initiator to the emulsion, since the emulsion is thicker, a longer stirring time (2h-3h) is required in order for the initiator to be fully mixed with the emulsion. Adding the initiator twice requires 4h-6h of stirring time. Therefore, a longer stirring time, plus the insulation time, will cause the overall mixing time of the emulsion and the initiator to be too long. Utility Model Content

[0005] The purpose of this application is to solve the problem in the prior art that since the emulsion is thick, the initiator needs to be stirred for a long time (2h-3h) to be fully mixed with the emulsion, and adding the initiator twice requires a stirring time of 4h-6h. Therefore, a long stirring time is required, and the insulation time plus the insulation time will cause the overall mixing time of the emulsion and the initiator to be too long. A production device for temporary plugging agents for oil well acid fracturing is proposed.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] A production device for oil well acid fracturing temporary plugging agent, comprising a reaction tank, the lower end of the side wall of the reaction tank is integrally provided with two barrels, and one side of the two barrels is provided with a squeezing piston plate, the reaction tank is installed with a driving mechanism for driving the two squeezing piston plates to move, the side walls of the two barrels are fixedly plugged with reflux pipes, the upper end of the outer wall of the reaction tank is fixedly sleeved with an annular initiator storage container, the lower end of the annular initiator storage container is integrally provided with a cone sleeve, and the ends of the two cone sleeves are fixedly connected with a flow pipe, the two flow pipes are connected with the reflux pipe on the same side, two blocking mechanisms for blocking the cone sleeves are installed inside the annular initiator storage container, the pipe ends of the two reflux pipes are installed with a heat preservation mechanism, and the two reflux pipes are connected with the reaction tank through the heat preservation mechanism, the end face of the reaction tank is fixedly plugged with a feed pipe, the bottom of the reaction tank is fixedly plugged with a discharge pipe, and a manual valve is installed inside the discharge pipe, and a stirring mechanism and a heating mechanism are installed inside the reaction tank.

[0008] Preferably, the two driving mechanisms each include an integrally formed mounting cover arranged at the bottom of the reaction tank, the side wall of the mounting cover is rotatably connected to two reciprocating screws, and the rod walls of the two reciprocating screws are transmission-connected to screw nuts, the outer side walls of the two screw nuts are fixedly sleeved with moving cylinders, the pushing piston plate is fixedly connected to the end of the moving cylinder on the same side, a dual-axis motor is fixedly installed inside the mounting cover, and the two output ends of the dual-axis motor are transmission-connected to the reciprocating screw on the same side, two groups of sliding rods are fixedly installed on the outer side wall of the mounting cover, and the side walls of the two moving cylinders are slidably connected to the rod walls of a group of two sliding rods on the same side.

[0009] Preferably, the two sealing mechanisms both include a conical plug arranged inside the conical sleeve, an iron core is fixedly installed on the top of the conical plug, a mounting cylinder is fixedly installed on the inner top of the annular initiator storage container, and the end of the mounting cylinder is slidably connected to the iron core, a spring is fixedly provided between the conical plug and the mounting cylinder, and an electromagnet is fixedly installed inside the mounting cylinder.

[0010] Preferably, the insulation mechanism includes a heat exchange tube fixedly installed on the end of the reflux pipe, and the heat exchange tube is connected to the interior of the reaction tank, the outer wall of the heat exchange tube is fixedly sleeved with a heat insulation sleeve, and the inner wall of the heat insulation sleeve is fixedly installed with an electric heating sleeve, and the electric heating sleeve is fixedly sleeved on the outside of the heat exchange tube.

[0011] Preferably, the tube walls of the two reflux pipes are fixedly plugged with pressure tubes, the two pressure tubes are fixedly connected to a trigger box, and a pressure membrane is fixedly installed inside the trigger box, a pressure switch is fixedly installed on the inner wall of the trigger box, the moving contact of the pressure switch is in contact with the side wall of the pressure membrane, and the two pressure switches are electrically connected to the electromagnet on the same side.

[0012] Compared with the prior art, the present application provides a production device for oil well acid fracturing temporary plugging agent, which has the following beneficial effects:

[0013] 1. The production device of the temporary plugging agent for acid fracturing of oil wells can prepare the temporary plugging agent for acid fracturing of oil wells through the cooperation of the reaction tank, barrel, extrusion piston plate, reflux pipe, cone sleeve, liquid flow pipe, feed pipe, discharge pipe, annular initiator storage container, stirring mechanism and heating mechanism. In the mixing process of the initiator, the initiator and the emulsion can be quickly mixed by externally circulating the emulsion and uniformly dripping the initiator, which is beneficial to improving the mixing efficiency of the initiator and the emulsion and reducing the mixing time required for the initiator and the emulsion. In addition, the heat preservation mechanism can make the emulsion fully absorb heat during the external circulation process, and the heating mechanism can improve the temperature uniformity of the emulsion.

[0014] 2. The production device of temporary plugging agent for acid fracturing of oil wells can easily drive two squeezing piston plates to move back and forth through the provided driving mechanism, and the plugging mechanism provided in conjunction with it can suspend the discharge of initiator during the process of the squeezing piston plates moving out of the barrel to avoid excessive discharge of initiator, and the provided pressure tube, trigger box, pressure membrane and pressure switch can automatically trigger the operation of the plugging mechanism based on the pressure difference generated when the squeezing piston plates move back and forth, which is easy to use.

[0015] Moreover, the parts not involved in the device are the same as the prior art or can be implemented by the prior art. The present application makes the initiator and the emulsion mix quickly by externally circulating the emulsion and evenly dripping the initiator, which is beneficial to improve the mixing efficiency of the initiator and the emulsion and reduce the mixing time required for the initiator and the emulsion. At the same time, during the external circulation process, the emulsion can fully absorb heat to improve the temperature uniformity of the emulsion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a production device for an oil well acid fracturing temporary plugging agent proposed in this application;

[0017] Figure 2 This is an enlarged structural diagram of part A of a production device for an oil well acid fracturing temporary plugging agent proposed in this application;

[0018] Figure 3 This is a schematic diagram of the internal structure of a trigger box of a production device for an oil well acid fracturing temporary plugging agent proposed in this application.

[0019] In the figure: 1. reaction tank; 2. barrel; 3. push piston plate; 4. reflux pipe; 5. annular initiator storage container; 6. cone sleeve; 7. liquid flow pipe; 8. feed pipe; 9. discharge pipe; 10. stirring mechanism; 11. heating mechanism; 12. mounting cover; 13. reciprocating screw rod; 14. moving cylinder; 15. double-axis motor; 16. sliding rod; 17. conical plugging; 18. iron core; 19. mounting cylinder; 20. spring; 21. electromagnet; 22. heat exchange tube; 23. insulation sleeve; 24. electric heating sleeve; 25. pressure tube; 26. trigger box; 27. pressure membrane; 28. pressure switch. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0021] Reference Figure 1-3 A production device for oil well acid fracturing temporary plugging agent, comprising a reaction tank 1, two barrels 2 are integrally formed at the lower end of the side wall of the reaction tank 1, and one side of the two barrels 2 is provided with a squeezing piston plate 3, a driving mechanism for driving the two squeezing piston plates 3 to move is installed inside the reaction tank 1, a reflux pipe 4 is fixedly plugged into the side walls of the two barrels 2, an annular initiator storage container 5 is fixedly sleeved at the upper end of the outer wall of the reaction tank 1, and a cone sleeve 6 is integrally formed at the lower end of the annular initiator storage container 5, and the ends of the two cone sleeves 6 are There is a fixedly connected liquid flow pipe 7, and both liquid flow pipes 7 are connected to the reflux pipe 4 on the same side. Two sealing mechanisms for sealing the cone sleeve 6 are installed inside the annular initiator storage container 5. The pipe ends of the two reflux pipes 4 are installed with insulation mechanisms, and the two reflux pipes 4 are connected to the reaction tank 1 through the insulation mechanism. A feed pipe 8 is fixedly inserted at the end face of the reaction tank 1, a drain pipe 9 is fixedly inserted at the bottom of the reaction tank 1, and a manual valve is installed inside the drain pipe 9. A stirring mechanism 10 and a heating mechanism 11 are installed inside the reaction tank 1.

[0022] Both driving mechanisms include an integrally formed mounting cover 12 arranged at the bottom of the reaction tank 1, the side wall of the mounting cover 12 is rotatably connected to two reciprocating screws 13, and the rod walls of the two reciprocating screws 13 are transmission-connected with screw nuts, the outer side walls of the two screw nuts are fixedly sleeved with a moving cylinder 14, the pushing piston plate 3 is fixedly connected to the end of the moving cylinder 14 on the same side, a dual-axis motor 15 is fixedly installed inside the mounting cover 12, and the two output ends of the dual-axis motor 15 are transmission-connected to the reciprocating screw 13 on the same side, two groups of sliding rods 16 are fixedly installed on the outer side wall of the mounting cover 12, and the side walls of the two moving cylinders 14 are slidably connected to the rod walls of a group of two sliding rods 16 on the same side, and when the dual-axis motor 15 drives the reciprocating screw 13 to rotate, it will drive the screw nut to drive the moving cylinder 14 to move back and forth along the sliding rod 16.

[0023] Both sealing mechanisms include a conical plug 17 arranged inside the conical sleeve 6, an iron core 18 is fixedly installed on the top of the conical plug 17, a mounting cylinder 19 is fixedly installed on the inner top of the annular initiator storage container 5, and the end of the mounting cylinder 19 is slidably connected to the iron core 18, a spring 20 is fixedly provided between the conical plug 17 and the mounting cylinder 19, and an electromagnet 21 is fixedly installed inside the mounting cylinder 19. Through this arrangement, the conical sleeve 6 can be easily sealed to prevent excessive outflow of initiator.

[0024] The heat preservation mechanism includes a heat exchange tube 22 fixedly installed at the end of the reflux tube 4, and the heat exchange tube 22 is connected to the interior of the reaction tank 1. The outer wall of the heat exchange tube 22 is fixedly sleeved with a heat insulation sleeve 23, and the inner wall of the heat insulation sleeve 23 is fixedly installed with an electric heating sleeve 24. The electric heating sleeve 24 is fixedly sleeved on the outer side of the heat exchange tube 22. Through this arrangement, the emulsion can be heated during the external circulation of the emulsion, which is conducive to the rapid and uniform temperature increase of the emulsion.

[0025] The walls of the two reflux pipes 4 are fixedly plugged with pressure pipes 25, and the two pressure pipes 25 are fixedly connected with a trigger box 26, and a pressure membrane 27 is fixedly installed inside the trigger box 26, and a pressure switch 28 is fixedly installed on the inner wall of the trigger box 26, and the moving contact of the pressure switch 28 is in contact with the side wall of the pressure membrane 27. The two pressure switches 28 are electrically connected to the electromagnet 21 on the same side. When the squeezing piston plate 3 moves toward the inside of the barrel 2 on the same side, due to the pressure generated by squeezing, the pressure membrane 27 will touch the moving contact of the pressure switch 28 under the action of pressure. At this time, the pressure switch 28 is closed, so the electromagnet 21 is energized. Therefore, when the emulsion flows back to the inside of the reaction tank 1, the initiator can be added to the emulsion simultaneously, and when the squeezing piston plate 3 moves back, due to the disappearance of the squeezing pressure, the moving contact of the pressure switch 28 moves back. At this time, the electromagnet 21 is powered off, and the conical plugging 17 re-seals the conical sleeve 6.

[0026] In the present application, when in use, the emulsion is fed into the reaction tank 1 from the feed pipe 8, and then half of the initiator is added into the annular initiator storage container 5. The stirring mechanism 10 and the heating mechanism 11 are started, and the stirring mechanism 10 can stir the emulsion in the reaction tank 1, while the heating mechanism 11 can heat the emulsion. After 20 minutes, the two pushing piston plates 3 are driven by the driving mechanism to enter the barrel 2 on the same side. Under the pushing pressure of the pushing piston plates 3, the emulsion in the barrel 2 will move up to the annular initiator storage container 5 through the reflux pipe 47. The initiator flows into the emulsion through the conical sleeve 6 and the liquid flow tube 7, so that the initiator can be added to the emulsion during the external circulation of the emulsion. Since the cross-section of the emulsion at the reflux pipe 47 is small, the mixing effect of the emulsion and the initiator is better. When the squeezing piston plate 3 moves to the outside of the barrel 2, the conical sleeve 6 is blocked by the blocking mechanism. At this time, the initiator stops entering the emulsion until the squeezing piston plate 3 enters the barrel 2 again, and the initiator is re-added to the emulsion, thereby completing the addition of the initiator and the emulsion.

[0027] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed in the present application according to the technical solution and utility model concept of the present application, which should be covered by the protection scope of the present application.

Claims

1. A production device for oil well acid fracturing temporary plugging agent, comprising a reaction tank (1), characterized in that: The lower end of the side wall of the reaction tank (1) is integrally formed with two barrels (2), and one side of the two barrels (2) is provided with a squeezing piston plate (3). A driving mechanism for driving the two squeezing piston plates (3) to move is installed inside the reaction tank (1). The side walls of the two barrels (2) are fixedly plugged with a reflux pipe (4). The upper end of the outer wall of the reaction tank (1) is fixedly sleeved with an annular initiator storage container (5). The lower end of the annular initiator storage container (5) is integrally formed with a cone sleeve (6), and the ends of the two cone sleeves (6) are fixedly connected with a liquid flow pipe (7). The two The liquid flow pipes (7) are both connected to the return pipe (4) on the same side. Two blocking mechanisms for blocking the cone sleeve (6) are installed inside the annular initiator storage container (5). The ends of the two return pipes (4) are both installed with insulation mechanisms. The two return pipes (4) are connected to the reaction tank (1) through the insulation mechanisms. A feed pipe (8) is fixedly inserted at the end surface of the reaction tank (1). A liquid discharge pipe (9) is fixedly inserted at the bottom of the reaction tank (1). A manual valve is installed inside the liquid discharge pipe (9). A stirring mechanism (10) and a heating mechanism (11) are installed inside the reaction tank (1).

2. The production device of oil well acid fracturing temporary plugging agent according to claim 1, characterized in that: The two driving mechanisms each comprise a mounting cover (12) integrally formed and arranged at the bottom of the reaction tank (1); the side wall of the mounting cover (12) is rotatably connected to two reciprocating screws (13), and the rod walls of the two reciprocating screws (13) are both transmission-connected to screw nuts; the outer side walls of the two screw nuts are both fixedly sleeved with a moving cylinder (14); the pushing piston plate (3) is fixedly connected to the end of the moving cylinder (14) on the same side; a dual-axis motor (15) is fixedly installed inside the mounting cover (12), and the two output ends of the dual-axis motor (15) are both transmission-connected to the reciprocating screw (13) on the same side; two groups of sliding rods (16) are fixedly installed on the outer side wall of the mounting cover (12), and the side walls of the two moving cylinders (14) are both slidably connected to the rod walls of the two sliding rods (16) on the same side.

3. The production device of oil well acid fracturing temporary plugging agent according to claim 1, characterized in that: The two blocking mechanisms each comprise a conical blocking (17) arranged inside the conical sleeve (6), an iron core (18) being fixedly mounted on the top of the conical blocking (17), a mounting tube (19) being fixedly mounted on the inner top of the annular initiator storage container (5), and an end of the mounting tube (19) being slidably connected to the iron core (18), a spring (20) being fixedly mounted between the conical blocking (17) and the mounting tube (19), and an electromagnet (21) being fixedly mounted inside the mounting tube (19).

4. The production device of oil well acid fracturing temporary plugging agent according to claim 1, characterized in that: The heat-insulating mechanism comprises a heat exchange tube (22) fixedly mounted on the end of the return tube (4), and the heat exchange tube (22) is connected to the interior of the reaction tank (1), an outer wall of the heat exchange tube (22) is fixedly sleeved with a heat insulation sleeve (23), and an inner wall of the heat insulation sleeve (23) is fixedly mounted with an electric heating sleeve (24), and the electric heating sleeve (24) is fixedly sleeved on the outer side of the heat exchange tube (22).

5. The production device of oil well acid fracturing temporary plugging agent according to claim 3, characterized in that: The walls of the two return pipes (4) are fixedly connected with pressure pipes (25), the two pressure pipes (25) are fixedly connected with a trigger box (26), and a pressure membrane (27) is fixedly installed inside the trigger box (26), and a pressure switch (28) is fixedly installed on the inner wall of the trigger box (26), the moving contact of the pressure switch (28) is in contact with the side wall of the pressure membrane (27), and the two pressure switches (28) are electrically connected to the electromagnet (21) on the same side.

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