Belt-driven synchronous polymer injection device and multi-stage continuous polymer injection method thereof

Abstract

The invention discloses a belt drive synchronous polymer injection device and a multistage continuous polymer injection method thereof.The belt drive synchronous polymer injection device comprises a rotating mechanism provided with a piston rod, and further comprises a reversing mechanism and a transmission mechanism; the reversing mechanism is provided with a piston sleeve and an intermittent reversing mechanism; the front end of the piston rod is inserted into the piston sleeve, and the intermittent reversing mechanism is connected with a rotating part of the rotating mechanism through the transmission mechanism. The intermittent reversing mechanism switches the liquid inlet channel and the liquid outlet channel according to the movement direction of the piston rod. In the suction and discharge process, the phenomena of shape change, streaming and the like of the cross section of a runner are avoided, and the damage to a polymer molecular chain is small; and the device can operate continuously, and the pressure of the polymer outlet can be adjusted by adjusting the resistance value.

Description

Technical Field

[0001] The present invention relates to the technical field of oil well polymer injection equipment, and specifically to a belt-driven synchronous polymer injection device and its multi-stage continuous polymer injection method. Background Art

[0002] Polymer flooding technology can further improve the oil displacement effect and enhance the oil recovery rate. Research shows that the oil recovery rate of polymer flooding is 6 - 12% higher than that of water flooding. Therefore, major oilfields are vigorously researching and promoting polymer flooding technology. Due to the heterogeneity of oil reservoirs, many polymer injection wells adopt the method of stratified injection. During the separate injection process, it is necessary to adjust the injection pressure and flow rate through an injection distribution device to meet the needs of different formations.

[0003] Existing polymer injection distribution devices mainly include piston type, coil type, cone valve type, and Venturi type. The piston type uses a positive displacement structure and can effectively reduce the shear rate when transporting large-flow injectants, but the disadvantage is that the output pressure cannot be adjusted in stages; the coil type flow controller has a compact structure and is easy to install, but the disadvantage is that the flow rate cannot be continuously adjusted and the viscosity loss is relatively large; the disadvantage of the cone valve type flow controller is that it is large in size and difficult to achieve continuous adjustment of the flow rate; the disadvantage of the Venturi type flow controller is that the flow rate cannot be continuously adjusted.

[0004] In summary, although the existing devices can achieve the distribution of polymer injection flow rates in different formations, they cannot adjust the polymer injection pressure, and the high shear damage to the polymer results in insufficient viscosity. Currently, the viscosity retention rate of the ground injection distribution device is 85% - 90% within a 3MPa pressure difference, and below 80% after >5MPa, making it difficult to meet the requirements of stratified polymer injection for flow rate, pressure, and viscosity retention, thus affecting the polymer flooding displacement effect.

[0005] Publication (Announcement) No.: CN113153732A discloses a hydraulic end of a reciprocating plunger type polymer injection pump, including a liquid cylinder body, a liquid cylinder cover is installed at the upper end of the liquid cylinder body, several groups of valve group mechanisms are installed in the liquid cylinder body, the valve group mechanism includes a suction valve and a discharge valve stacked vertically, the lower end of the liquid cylinder body is connected with a header type suction main pipe, the suction ports of the suction valves are all connected to the suction main pipe, and the suction main pipe is connected to the lower end face of the liquid cylinder body through a connecting flange; a reciprocating plunger penetrates through one side of the liquid cylinder body, and one end of the reciprocating motion of the plunger is located in the suction valve cavity of the suction valve, and the discharge valve cavities of the discharge valves are all connected to form a discharge flow channel; the discharge flow channel has a large and small hole structure. This invention realizes that the shear rate can be effectively reduced when transporting large-flow injectants, thereby ensuring the effectiveness of polymer flooding.

[0006] This prior art has the problem that the output pressure cannot be adjusted in stages.

[0007] Publication (Announcement) Number: CN115949383A, which discloses a positive displacement low-shear polymer injection device for polymer injection wells and its usage method. The device includes a first electric valve, a buffer device, a second electric valve, an accumulator, and a third electric valve. Pipeline A is the input main line of the polymer solution. The inlet and outlet of the first electric valve are respectively connected to Pipeline A and the buffer device. The inlet and outlet of the second electric valve are respectively connected to the buffer device and the accumulator. The inlet of the third electric valve is connected to the buffer device, and the outlet is connected to Pipeline B leading to the wellhead device. The buffer device and the accumulator indirectly adjust the velocity of the polymer liquid by adjusting the flow rate of the buffer liquid. The positive displacement low-shear polymer injection device for polymer injection wells and its usage method can be used in the surface process of polymer injection wells in oil fields to achieve low-shear injection of the polymer solution from the main line to the wellhead, which is of great significance for improving the viscosity retention rate of the polymer solution and enhancing the oil displacement effect.

[0008] This prior art has the problem that the output pressure cannot be adjusted in stages.

[0009] Publication (Announcement) Number: CN214171488U, which discloses a low-shear rate plunger pump valve body and a plunger pump. While ensuring the sealing effect on the medium, the plunger pump valve body and the plunger pump reduce the instantaneous rate during the liquid flow turning through the arc-shaped flow channel design, thereby reducing the shearing effect on the polymer. A low-shear rate plunger pump valve body, the plunger pump valve body has a butterfly structure and is composed of a plunger pump valve main body and a plunger pump valve spherical surface; a spring installation protrusion is provided on the plunger pump valve main body, and the end of the plunger pump valve main body is a spring positioning head; a spring slot is also provided on the side of the spring installation protrusion away from the end of the plunger pump valve main body.

[0010] This prior art has the problem that the output pressure cannot be adjusted in stages.

[0011] In summary, the technical solutions, the technical problems to be solved, and the beneficial effects of the above-disclosed technologies are all different from those of the present invention. Regarding more technical features, technical problems to be solved, and beneficial effects of the present invention, no technical inspiration can be found in the above-disclosed technical documents. Summary of the Invention

[0012] Aiming at the above-mentioned defects existing in the prior art, the purpose of the present invention is to provide a belt-driven synchronous polymer injection device and its multi-stage continuous polymer injection usage method, which makes the movement more stable and the injection more efficient, so as to ensure a smaller pressure difference between the input and output of the polymer during polymer injection and less shearing of the polymer molecular chain.

[0013] To achieve the above purpose, the present invention adopts the following technical solutions:

[0014] A belt-driven synchronous polymer injection device includes a rotating mechanism, the rotating mechanism is provided with a piston rod, and also includes a commutation mechanism and a transmission mechanism;

[0015] The commutation mechanism is provided with a piston sleeve and an intermittent commutation mechanism;

[0016] The front end of the piston rod is inserted into the piston sleeve, and the intermittent commutation mechanism is connected to the rotating part of the rotating mechanism through a transmission mechanism; the intermittent commutation mechanism switches the liquid inlet channel and the liquid discharge channel according to the movement direction of the piston rod.

[0017] The rotating mechanism includes a box body, a crankshaft, a connecting rod, and a piston rod;

[0018] The crankshaft, the connecting rod, and the piston rod are all arranged in the box body. The crankshaft is provided with a first transmission shaft passing through the box body. The connecting rod is connected to the connecting rod shaft of the crankshaft. The piston rod is connected to the connecting rod through a cross assembly. The piston rod passes through the box body and is connected to the commutation mechanism;

[0019] The left end and the right end of the box body are installed with box body bearing end covers;

[0020] The connecting rod is provided with a front connecting rod and a rear connecting rod. The front connecting rod and the rear connecting rod are installed on the connecting rod shaft of the crankshaft through bolts. The front end of the front connecting rod is provided with a connecting handle, and a first connecting hole is arranged on the connecting handle; a convex platform is arranged at the rear end, and the first piston is inserted into the connecting seat;

[0021] The cross assembly includes a cross head, a cross intermediate rod, a cross head pin, and a cross head nut;

[0022] The rear end of the cross intermediate rod is connected to the front end of the cross head. Through holes are arranged on the left and right walls of the cross head. The cross head pin passes through the second connecting hole and the first connecting hole;

[0023] A concave platform matching the convex platform of the piston rod is arranged at the front end of the cross intermediate rod. The convex platform of the piston rod is inserted into the concave platform. The cross head nut locks the convex platform of the piston rod at the front end of the cross intermediate rod. A ring with a diameter smaller than that of the cross head nut is also arranged between the cross head nut and the convex platform of the piston rod.

[0024] The commutation mechanism further includes a connecting seat and a plunger seat. The intermittent commutation mechanism includes an intermittent driving mechanism and a liquid flow channel switching mechanism;

[0025] A first piston is arranged at the front end of the piston rod. The first piston is inserted into the connecting seat. The piston sleeve is arranged in the connecting seat. The first piston slides in the piston sleeve;

[0026] The front end of the connecting seat is connected with a plunger seat. The front end of the piston sleeve is connected with the rear end of the plunger seat. A piston port is arranged on the inner wall of the plunger seat to communicate the inside of the plunger seat with the piston sleeve.

[0027] The intermittent driving mechanism includes a camshaft;

[0028] A left bearing seat and a right bearing seat are provided at the upper end of the plunger seat. The camshaft passes through the left bearing seat and the right bearing seat. The camshaft is provided with a second transmission shaft passing through the left bearing seat or the right bearing seat, and the second transmission shaft is on the same side of the device as the first transmission shaft;

[0029] Cams are provided on the camshaft. The cams are provided with a large-diameter circle and a small-diameter circle, and the large-diameter circle and the small-diameter circle are provided with a smooth transition.

[0030] The liquid flow channel switching mechanism includes an inlet and outlet liquid plunger;

[0031] The plunger seat is provided with a plunger seat liquid inlet and a plunger seat liquid outlet. The inlet and outlet liquid plunger is arranged in the plunger seat. An adjusting rod is provided at the upper end of the inlet and outlet liquid plunger, and the adjusting rod passes through the plunger seat and contacts the cam;

[0032] Upper and lower sealing rings are provided on the inlet and outlet liquid plunger;

[0033] The upper sealing ring is above the lower sealing ring. When the lower sealing ring seals the plunger seat liquid outlet, the upper sealing ring is above the plunger seat liquid inlet, the piston port is above the lower sealing ring, and the piston sleeve is communicated with the plunger seat liquid inlet through the cavity between the upper and lower sealing rings;

[0034] When the upper sealing ring seals the plunger seat liquid inlet, the lower sealing ring is below the plunger seat liquid outlet, the piston port is below the upper sealing ring, and the piston sleeve is communicated with the plunger seat liquid outlet through the cavity between the upper and lower sealing rings.

[0035] Both the upper sealing ring or the lower sealing ring include a first sealing ring seat and a second sealing ring seat. Sealing rings are provided on both the first sealing ring seat and the second sealing ring seat, and the distance between the first sealing ring seat and the second sealing ring seat is greater than the diameters of the plunger seat liquid inlet and the plunger seat liquid outlet.

[0036] A return spring retaining piece is provided on the adjusting rod. A spring is provided below the return spring retaining piece. The spring presses the return spring retaining piece upward and presses the plunger seat downward.

[0037] The connecting seat is connected to the box body. A cover is provided at the right end of the piston sleeve; an upper pressing cover is provided at the upper end of the plunger seat. A small cover plate is provided above the piston rod of the box body, and a large cover plate is provided above the crankshaft.

[0038] The connection between the connecting seat and the box body, the connection between the camshaft seat and the connecting seat, the connection between the small bearing seat and the connecting seat, and the connection between the large bearing seat and the connecting seat are all connected by bolts; the cam is fixed on the camshaft by a key, and a camshaft sleeve is sleeved on the camshaft to position the cam.

[0039] The transmission mechanism includes a belt pulley and a transmission belt;

[0040] Both the first rotating shaft and the second transmission shaft are provided with belt pulleys, and the transmission belt connects the two belt pulleys, and the two belt pulleys rotate synchronously through the transmission belt.

[0041] The belt pulley is connected to the camshaft or the crankshaft through a key, limited by a shaft shoulder, and fixed to the camshaft or the crankshaft through a bolt.

[0042] In an embodiment of the present invention, at least three connecting rod shafts of the crankshaft are circumferentially and uniformly arranged, and the numbers of the connecting rod, the piston rod, the liquid inlet and outlet plunger, the cam, and the piston sleeve are the same as the number of the connecting rod shafts of the crankshaft, all being at least three.

[0043] In an embodiment of the present invention, a damping adjustment mechanism is further provided, and the damping adjustment mechanism includes a brake, and the brake is installed on the first transmission shaft or the second transmission shaft.

[0044] In an embodiment of the present invention, a driving device is further provided, the first transmission shaft or the second transmission shaft is connected to the output shaft of the driving device, and the driving device is an internal combustion engine or an electric motor.

[0045] A multi-stage continuous polymer injection method for a belt-driven synchronous polymer injection device includes the following steps:

[0046] S1. Connect the first transmission shaft or the second transmission shaft to the damping adjustment mechanism, connect the polymer inlet pipe to the liquid inlet of the plunger seat, and connect the polymer output pipe to the liquid outlet of the plunger seat; according to the construction requirements, adjust the resistance through the damping adjustment mechanism, that is, adjust the braking torque through the brake;

[0047] S2. Press the polymer, and the intermittent commutation mechanism conducts the liquid inlet of the plunger seat to the piston sleeve, that is, the contact between the cam and the adjusting rod is a small diameter contact, the lower sealing ring seals the liquid outlet of the plunger seat, the upper sealing ring is above the liquid inlet of the plunger seat, the piston port is above the lower sealing ring, the polymer enters the inside of the plunger seat, reaches the piston port through the cavity between the upper and lower sealing rings, enters the piston sleeve and pushes the first piston to move backward, driving the crankshaft to rotate;

[0048] Rotate the first transmission shaft to drive the transmission belt to rotate, the transmission belt drives the second transmission shaft, and then drives the camshaft to rotate, so that the intermittent commutation mechanism switches, disconnects the liquid inlet of the plunger seat from the piston sleeve, and conducts the liquid outlet of the plunger seat to the piston sleeve, that is, the contact between the cam and the adjusting rod changes from a small diameter contact to a large diameter contact, the liquid inlet and outlet plunger moves downward, the upper sealing ring seals the liquid inlet of the plunger seat, the lower sealing ring is below the liquid outlet of the plunger seat, and the piston port is below the upper sealing ring;

[0049] S3. The first transmission shaft continues to rotate, and the crankshaft continues to rotate, pushing the first piston forward, causing the polymer in the piston sleeve to enter the polymer output pipe. That is, the polymer in the piston sleeve passes through the piston port, passes through the cavity between the upper and lower sealing rings, reaches the drain port of the plunger seat, enters the polymer output pipe, and is injected into the formation. The intermittent commutation mechanism switches, and the contact between the cam and the adjusting rod changes from large-diameter contact to small-diameter contact, connecting the liquid inlet of the plunger seat with the piston sleeve, disconnecting the drain port of the plunger seat from the piston sleeve, and starting the cyclic operation.

[0050] A continuous polymer injection method for a belt-driven synchronous polymer injection device includes the following steps:

[0051] S1. Connect the first transmission shaft or the second transmission shaft to the output shaft of the driving device, connect the polymer inlet pipe to the liquid inlet of the plunger seat, and connect the polymer output pipe to the drain port of the plunger seat. The driving device is an internal combustion engine or an electric motor.

[0052] S2. Start the driving device. The first transmission shaft and the second transmission shaft start to rotate synchronously under the action of the rotating mechanism. The intermittent commutation mechanism connects the liquid inlet of the plunger seat with the piston sleeve, and the first piston moves backward, generating negative pressure. That is, the contact between the cam and the adjusting rod is small-diameter contact. The upper sealing ring is above the liquid inlet of the plunger seat, and the piston port is above the lower sealing ring. The polymer enters the inside of the plunger seat, passes through the cavity between the upper and lower sealing rings, reaches the piston port, and enters the piston sleeve. At the same time, the second transmission shaft rotates, and the camshaft rotates, causing the intermittent commutation mechanism to switch, disconnecting the liquid inlet of the plunger seat from the piston sleeve, and connecting the drain port of the plunger seat with the piston sleeve. That is, the contact between the cam and the adjusting rod changes from small-diameter contact to large-diameter contact. The inlet and outlet plunger moves downward, and the upper sealing ring seals the liquid inlet of the plunger seat. The lower sealing ring is below the drain port of the plunger seat, and the piston port is below the upper sealing ring.

[0053] S3. The first transmission shaft continues to rotate, and the crankshaft continues to rotate, pushing the first piston forward, causing the polymer in the piston sleeve to enter the polymer output pipe. That is, the polymer in the piston sleeve passes through the piston port, passes through the cavity between the upper and lower sealing rings, reaches the drain port of the plunger seat, enters the polymer output pipe, and is injected into the formation. The intermittent commutation mechanism switches, and the contact between the cam and the adjusting rod changes from large-diameter contact to small-diameter contact, connecting the liquid inlet of the plunger seat with the piston sleeve, disconnecting the drain port of the plunger seat from the piston sleeve, and starting the cyclic operation.

[0054] The present invention has the following beneficial effects compared with the prior art:

[0055] The present invention uses a positive displacement method to inhale and discharge the polymer. During the positive displacement inhalation and discharge process, there are no phenomena such as changes in the cross-sectional shape of the flow channel and flow around, and the damage to the polymer molecular chain is relatively small.

[0056] The device realizes the suction and discharge of polymers through the reciprocating motion of three pistons, reduces the damage to polymer molecular chains during the polymer injection process, ensures the viscosity of the polymer, and achieves low shear.

[0057] The belt drive connection between the camshaft and the crankshaft can ensure the synchronous operation between the camshaft and the crankshaft, and further realize the switching of the polymer inlet and outlet flow channels.

[0058] Multiple sets of actuating components are provided to ensure the continuous operation of the entire device.

[0059] The regulation of the polymer outlet pressure is achieved by adjusting the pressure applied to the brake. Description of the Drawings

[0060] Figure 1 is a schematic structural diagram of a belt drive synchronous polymer injection device of the present invention;

[0061] Figure 2 is a schematic internal structural diagram of a belt drive synchronous polymer injection device of the present invention;

[0062] Figure 3 is a cross-sectional view of the rotating mechanism of a belt drive synchronous polymer injection device of the present invention;

[0063] Figure 4 is a cross-sectional view of the commutation mechanism of a belt drive synchronous polymer injection device of the present invention;

[0064] Figure 5 is a schematic diagram of the liquid inlet state of a belt drive synchronous polymer injection device of the present invention;

[0065] Figure 6 is a schematic diagram of the liquid discharge state of a belt drive synchronous polymer injection device of the present invention;

[0066] In the figure: 1. Plunger seat; 1-1. Liquid inlet of the plunger seat; 1-2. Liquid discharge port of the plunger seat; 1-3. Piston port; 2. Small bearing seat; 3. Short camshaft sleeve; 4. Cam; 5. Camshaft sleeve; 6. Camshaft; 7. Large bearing seat; 8. Small cover plate; 9. Box body; 10. Large cover plate; 11. Bearing end cover of the box body; 12. Belt pulley; 12-1. Transmission belt; 13. Connecting seat; 14. Return spring retaining piece; 15. Spring; 16. Upper gland; 17. Reciprocating plunger; 18. Crosshead nut; 19. Crosshead intermediate rod; 20. Crosshead; 21. Front end of the connecting rod; 22. Rear end of the connecting rod; 23. Crankshaft; 24. Crosshead pin; 25. Ring; 26. Sealing cover; 27. Piston; 28. Inlet and outlet liquid plunger; 29. Piston sleeve; 30. Brake. Detailed Embodiments

[0067] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0068] Embodiment 1:

[0069] Please refer to Figures 1 to 6 , a belt-driven synchronous polymer injection device and its multi-stage continuous polymer injection method provided by the present invention include a commutation mechanism, a rotation mechanism, a transmission mechanism, and a damping adjustment mechanism.

[0070] The rotation mechanism includes a box body 9, a crankshaft 23, a connecting rod, and a piston rod 17. The crankshaft 23, the connecting rod, and the piston rod 17 are all arranged in the box body 9. The crankshaft 23 is provided with a first transmission shaft passing through the box body 9. The connecting rod is connected to the connecting rod shaft of the crankshaft 23. The piston rod 17 is connected to the connecting rod through a cross assembly. The piston rod 17 passes through the box body and is connected to the commutation mechanism;

[0071] The left end and the right end of the box body 9 are installed with box body bearing end covers 11 to fix the crankshaft 23. The connecting rod is provided with a front connecting rod 21 and a rear connecting rod 22. The front connecting rod 21 and the rear connecting rod 22 are installed on the connecting rod shaft of the crankshaft 23 through bolts. The front end of the front connecting rod 21 is provided with a connecting handle, and a first connecting hole is arranged on the connecting handle. The front end of the piston rod 17 is provided with a first piston 27, and the rear end is provided with a boss. The first piston 27 is inserted into the connecting seat 13;

[0072] The cross assembly includes a crosshead 20, a cross intermediate rod 19, a crosshead pin 24, and a crosshead nut 18. The rear end of the cross intermediate rod 19 is connected to the front end of the crosshead 20. The left and right walls of the crosshead 20 are provided with through second connecting holes. The crosshead pin 24 passes through the second connecting hole and the first connecting hole to connect the crosshead 20 and the front connecting rod 21. The front end of the cross intermediate rod 19 is provided with a concave platform matching the boss of the piston rod 17. The boss of the piston rod 17 is inserted into the concave platform. The crosshead nut 18 locks the boss of the piston rod 17 at the front end of the cross intermediate rod 19. A ring 25 with a diameter smaller than that of the crosshead nut 18 is also arranged between the crosshead nut 18 and the boss of the piston rod 17 to enhance the locking effect.

[0073] The commutation mechanism includes a connecting seat 13, a plunger seat 1, a camshaft 6, and an inlet / outlet liquid plunger 28. The connecting seat 13 is connected to the box body 9. A piston sleeve 29 is arranged in the connecting seat 13. The first piston 27 slides in the piston sleeve 29;

[0074] A left bearing block 2 and a right bearing block 7 are arranged at the upper end of the plunger seat 1. The camshaft 6 passes through the left bearing block 2 and the right bearing block 7. The camshaft 6 is provided with a second transmission shaft passing through the left bearing block 2 or the right bearing block 7. The second transmission shaft and the first transmission shaft are on the same side of the device. A cam 4 is arranged on the camshaft 6. The front end of the piston sleeve 29 is connected to the rear end of the plunger seat 1. A piston port 1-3 is arranged on the inner wall of the plunger seat 1 to communicate the inside of the plunger seat 1 with the piston sleeve 29.

[0075] The plunger seat 1 is provided with a plunger seat liquid inlet 1-1 and a plunger seat liquid outlet 1-2. The liquid inlet and outlet plunger 28 is arranged in the plunger seat 1. An adjusting rod is arranged at the upper end of the liquid inlet and outlet plunger 28. The adjusting rod passes out of the plunger seat 1 and contacts the cam 4. The cam 4 is provided with a large-diameter circle and a small-diameter circle, and the large-diameter circle and the small-diameter circle are set with a smooth transition.

[0076] A cover 26 is arranged at the right end of the piston sleeve 29.

[0077] As Figure 5 、 Figure 6 shown, an upper sealing ring and a lower sealing ring are arranged on the liquid inlet and outlet plunger 28. The upper sealing ring is above the lower sealing ring. When the lower sealing ring seals the plunger seat liquid outlet 1-2, the upper sealing ring is above the plunger seat liquid inlet 1-1, and the piston port 1-3 is above the lower sealing ring. The piston sleeve 29 is communicated with the plunger seat liquid inlet 1-1 through the cavity between the upper and lower sealing rings. When the upper sealing ring seals the plunger seat liquid inlet 1-1, the lower sealing ring is below the plunger seat liquid outlet 1-2, the piston port 1-3 is below the upper sealing ring, and the piston sleeve 29 is communicated with the plunger seat liquid outlet 1-2 through the cavity between the upper and lower sealing rings.

[0078] Both the upper sealing ring or the lower sealing ring includes a first sealing ring seat and a second sealing ring seat. Sealing rings are arranged on both the first sealing ring seat and the second sealing ring seat. The distance between the first sealing ring seat and the second sealing ring seat is greater than the diameters of the plunger seat liquid inlet 1-1 and the plunger seat liquid outlet 1-2.

[0079] An upper pressing cover 16 is arranged at the upper end of the plunger seat 1. A return spring retaining piece 22 is arranged on the adjusting rod. A spring 23 is arranged below the return spring retaining piece 22. The spring 23 pushes up the return spring retaining piece 22 and pushes down the upper pressing cover 16.

[0080] A small cover plate 8 is arranged above the piston rod 17 on the box body 9, and a large cover plate 10 is arranged above the crankshaft 23 to facilitate maintenance.

[0081] The transmission mechanism includes a pulley 12 and a transmission belt 12-1. Pulleys 12 are provided on both the first rotating shaft and the second transmission shaft. The transmission belt 12-1 connects the two pulleys. The two pulleys 12 rotate synchronously through the transmission belt 12-1. The belt drive cooperation between the camshaft 6 and the crankshaft 23 can ensure the synchronous operation between the camshaft 6 and the crankshaft 23, thereby realizing the switching of the polymer liquid inlet and the drain passage.

[0082] The damping adjustment mechanism includes a brake 30. The brake 30 is installed on the first transmission shaft or the second transmission shaft. By applying pressure to the brake to hold the first transmission shaft or the second transmission shaft tightly, a braking torque is applied to the transmission system, reducing the magnitude of the thrust acting on the polymer when the piston drains liquid, realizing high-pressure injection and low-pressure discharge. Adjusting the braking pressure of the brake 30 can adjust the magnitude of the braking torque, and further adjust the pressure when the polymer is discharged, realizing the function of pressure regulation.

[0083] This embodiment is used as a multi-stage hydraulic injection device:

[0084] S1. Connect the first transmission shaft or the second transmission shaft to the damping adjustment mechanism, connect the polymer liquid inlet pipe to the liquid inlet 1-1 of the plunger seat, and connect the polymer output pipe to the liquid drain 1-2 of the plunger seat; according to the construction requirements, adjust the braking torque through the brake 30;

[0085] S2. Press in the polymer. At this time, the cam 4 is in contact with the adjusting rod at a small diameter. The lower sealing ring seals the liquid drain 1-2 of the plunger seat. The upper sealing ring is above the liquid inlet 1-1 of the plunger seat. The piston port 1-3 is above the lower sealing ring. The polymer enters the inside of the plunger seat 1, reaches the piston port 1-3 through the cavity between the upper and lower sealing rings, enters the piston sleeve 29 and pushes the first piston 27 to move backward, driving the crankshaft 23 to rotate. The crankshaft 23 drives the transmission belt 12-1 to rotate. The transmission belt 12-1 drives the camshaft 6 to rotate, causing the contact between the cam 4 and the adjusting rod to change from a small diameter to a large diameter, and the inlet and outlet plunger 28 moves downward.

[0086] S3. At this time, the upper sealing ring seals the liquid inlet 1-1 of the plunger seat. The lower sealing ring is below the liquid drain 1-2 of the plunger seat. The piston port 1-3 is below the upper sealing ring. The crankshaft 23 continues to rotate, pushing the first piston 27 to move forward, so that the polymer in the piston sleeve 29 passes through the piston port 1-3, reaches the liquid drain 1-2 of the plunger seat through the cavity between the upper and lower sealing rings, enters the polymer output pipe, and is injected into the formation. The contact between the cam 4 and the adjusting rod changes from a large diameter to a small diameter, and the cycle starts.

[0087] This usage method is hydraulically driven.

[0088] Embodiment 2:

[0089] Based on Embodiment 1, the present invention is made to have the ability of continuous polymer injection, and the connection mode of parts is further defined. At least three connecting rod journals of the crankshaft 23 are circumferentially and uniformly arranged. The numbers of the connecting rods, the piston rods 17, the inlet and outlet liquid plungers 28, the cams 4, and the piston sleeves 2927 are the same as the number of the connecting rod journals of the crankshaft 23, all being at least three.

[0090] When in use in this embodiment, at least three groups of connecting rods, piston rods 17, inlet and outlet liquid plungers 28, and cams 4 move alternately, greatly improving the continuity of polymer injection.

[0091] The connection mode of each part of the present invention is further defined. The connection between the connection seat 13 and the box body 9, the connection between the camshaft seat 24 and the connection seat 13, the connection between the small bearing seat 4 and the connection seat 13, and the connection between the large bearing seat 10 and the connection seat 13 are all connected by bolts; the cam 4 is fixed on the camshaft 6 by a key, and a camshaft sleeve 5 is sleeved on the camshaft 6 to position the cam 4.

[0092] The belt pulley 12 is connected to the camshaft 6 or the crankshaft 23 by a key, limited by a shaft shoulder, and fixed on the camshaft 6 or the crankshaft 23 by bolts.

[0093] Embodiment 3:

[0094] Based on Embodiment 2, the present device is used as an ordinary low-shear injection device. The first transmission shaft or the second transmission shaft is connected to the output shaft of the driving device, and the driving device is an internal combustion engine or an electric motor.

[0095] Using this embodiment as an ordinary low-shear continuous polymer injection device:

[0096] S1. Connect the first transmission shaft or the second transmission shaft to the output shaft of the driving device, connect the polymer inlet pipe to the liquid inlet 1-1 of the plunger seat, and connect the polymer output pipe to the liquid outlet 1-2 of the plunger seat;

[0097] S2. Start the driving device. The transmission belt 12-1 makes the crankshaft 23 and the camshaft 6 rotate synchronously. The crankshaft 23 drives the first piston 27 to move backward, generating negative pressure. At this time, the contact between the cam 4 and the adjusting rod is a small diameter, the upper sealing ring is above the liquid inlet 1-1 of the plunger seat, the piston port 1-3 is above the lower sealing ring, and the polymer enters the inside of the plunger seat 1, reaches the piston port 1-3 through the cavity between the upper and lower sealing rings, and enters the piston sleeve 29.

[0098] At the same time, the camshaft 6 rotates, making the contact between the cam 4 and the adjusting rod change from small diameter contact to large diameter contact, and the inlet and outlet liquid plunger 28 moves downward;

[0099] S3. At this time, the upper sealing ring seals the liquid inlet 1-1 of the plunger seat. The lower sealing ring is below the liquid outlet 1-2 of the plunger seat, and the piston port 1-3 is below the upper sealing ring. The crankshaft 23 continues to rotate, pushing the first piston 27 forward, causing the polymer in the piston sleeve 29 to pass through the piston port 1-3, reach the liquid outlet 1-2 of the plunger seat through the cavity between the upper and lower sealing rings, enter the polymer output pipe, and be injected into the formation. The cam 4 contacts the adjusting rod from a large diameter to a small diameter, and the cycle starts.

[0100] This usage method is driven by mechanical force.

[0101] In this application, all components that are not elaborated on themselves and the connection methods of each component in this application belong to the well-known technologies in this technical field. They can be directly applied and will not be elaborated further.

[0102] In the present invention, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "joined", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "joined" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0103] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the present invention.

[0104] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0105] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A belt-driven synchronous polymer injection device, comprising a rotating mechanism, wherein the rotating mechanism is provided with a piston rod, characterized in that: It also includes a reversing mechanism and a transmission mechanism; The reversing mechanism is provided with a piston sleeve and an intermittent reversing mechanism; The front end of the piston rod is inserted into the piston sleeve, and the intermittent reversing mechanism is connected to the rotating part of the rotating mechanism through a transmission mechanism; the intermittent reversing mechanism switches the liquid inlet channel and the liquid discharge channel according to the movement direction of the piston rod.

2. A belt-driven synchronous polymer injection device according to claim 1, characterized in that: The rotating mechanism comprises a housing, a crankshaft, a connecting rod and a piston rod; The crankshaft, connecting rod and piston rod are all arranged in a box body. The crankshaft is provided with a first transmission shaft passing through the box body. The connecting rod is connected to the connecting rod shaft of the crankshaft. The piston rod is connected to the connecting rod through a cross assembly. The piston rod passes through the box body and is connected to the reversing mechanism.

3. A belt-driven synchronous polymer injection device according to claim 2, characterized in that: The box body bearing end covers are installed at the left and right ends of the box body; The connecting rod is provided with a front connecting rod and a rear connecting rod, and the front connecting rod and the rear connecting rod are installed on the connecting rod shaft of the crankshaft by bolts. The front end of the front connecting rod is provided with a connecting handle, and the connecting handle is provided with a first connecting hole; the rear end is provided with a boss, and the first piston is inserted into the connecting seat; The cross assembly includes a cross head, a cross intermediate rod, a cross head pin, and a cross head nut; The rear end of the cross rod is connected to the front end of the cross head, and the left and right walls of the cross head are provided with second connecting holes, and the cross head pin is inserted into the second connecting hole and the first connecting hole; The front end of the cross rod is provided with a recessed platform matching the piston rod boss, the piston rod boss is inserted into the recessed platform, the cross head nut locks the piston rod boss at the front end of the cross rod, and a circular ring with a smaller aperture than the cross head nut is also provided between the cross head nut and the piston rod boss.

4. A belt-driven synchronous polymer injection device according to claim 2, characterized in that: The reversing mechanism further comprises a connecting seat and a plunger seat, and the intermittent reversing mechanism comprises an intermittent driving mechanism and a liquid flow channel switching mechanism; A first piston is arranged at the front end of the piston rod, the first piston is inserted into a connecting seat, the piston sleeve is arranged in the connecting seat, and the first piston slides in the piston sleeve; The front end of the connecting seat is connected to a plunger seat, the front end of the piston sleeve is connected to the rear end of the plunger seat, and the inner wall of the plunger seat is provided with a piston port to connect the inside of the plunger seat with the piston sleeve.

5. The belt-driven synchronous polymer injection device according to claim 4, characterized in that: The intermittent drive mechanism includes a camshaft; The upper end of the plunger seat is provided with a left bearing seat and a right bearing seat, the camshaft passes through the left bearing seat and the right bearing seat, the camshaft is provided with a second transmission shaft passing through the left bearing seat or the right bearing seat, and the second transmission shaft and the first transmission shaft are on the same side of the device; The camshaft is provided with a cam, and the cam is provided with a large diameter circle and a small diameter circle, and the large diameter circle and the small diameter circle are provided with a smooth transition.

6. A belt-driven synchronous polymer injection device according to claim 5, characterized in that: The liquid flow channel switching mechanism includes a liquid inlet and outlet plunger; The plunger seat is provided with a plunger seat liquid inlet and a plunger seat liquid discharge port, the liquid inlet and discharge plunger is arranged in the plunger seat, an adjusting rod is arranged at the upper end of the liquid inlet and discharge plunger, and the adjusting rod passes through the plunger seat and contacts the cam; The liquid inlet and outlet plunger is provided with an upper sealing ring and a lower sealing ring; The upper sealing ring is above the lower sealing ring. When the lower sealing ring seals the liquid discharge port of the plunger seat, the upper sealing ring is above the liquid inlet of the plunger seat, the piston port is above the lower sealing ring, and the piston sleeve is connected to the liquid inlet of the plunger seat through the cavity between the upper and lower sealing rings. When the upper sealing ring seals the plunger seat liquid inlet, the lower sealing ring is below the plunger seat liquid discharge port, the piston port is below the upper sealing ring, and the piston sleeve is connected to the plunger seat liquid discharge port through the cavity between the upper and lower sealing rings.

7. The belt-driven synchronous polymer injection device according to claim 6, characterized in that: The upper sealing ring or the lower sealing ring includes a first sealing ring seat and a second sealing ring seat, and the first sealing ring seat and the second sealing ring seat are both provided with sealing rings. The distance between the first sealing ring seat and the second sealing ring seat is greater than the diameter of the plunger seat liquid inlet and the diameter of the plunger seat liquid outlet.

8. The belt-driven synchronous polymer injection device according to claim 7, characterized in that: The adjusting rod is provided with a return spring baffle, and a spring is provided below the return spring baffle. The spring pushes the return spring baffle upward and pushes the plunger seat downward.

9. The belt-driven synchronous polymer injection device according to claim 8, characterized in that: The connecting seat is connected to the box body, and a sealing cover is arranged at the right end of the piston sleeve; an upper pressure cover is arranged at the upper end of the plunger seat, and a small cover plate is arranged above the piston rod of the box body, and a large cover plate is arranged above the crankshaft.

10. The belt-driven synchronous polymer injection device according to claim 9, characterized in that: The connection between the connecting seat and the box body, the connection between the camshaft seat and the connecting seat, the connection between the small bearing seat and the connecting seat, and the connection between the large bearing seat and the connecting seat are all connected by bolts; the cam is fixed to the camshaft by a key, and a camshaft sleeve positioning cam is sleeved on the camshaft.

11. The belt-driven synchronous polymer injection device according to claim 5, characterized in that: The transmission mechanism comprises a pulley and a transmission belt; The first rotating shaft and the second transmission shaft are both provided with pulleys, the transmission belt connects the two pulleys, and the two pulleys rotate synchronously through the transmission belt.

12. The belt-driven synchronous polymer injection device according to claim 11, characterized in that: The pulley is connected to the camshaft or crankshaft through a key, is limited by a shaft shoulder, and is fixed to the camshaft or crankshaft through bolts.

13. The belt-driven synchronous polymer injection device according to claim 6, characterized in that: At least three connecting rod shafts of the crankshaft are evenly arranged in the circumferential direction, and the number of the connecting rods, piston rods, inlet and outlet plungers, cams, and piston sleeves is consistent with the number of the connecting rod shafts of the crankshaft, which are all at least three.

14. A belt-driven synchronous polymer injection device according to any one of claims 2 to 14, characterized in that: A damping adjustment mechanism is also provided, and the damping adjustment mechanism comprises a brake, and the brake is installed on the first transmission shaft or the second transmission shaft.

15. A belt-driven synchronous polymer injection device according to any one of claims 2 to 14, characterized in that: A driving device is also provided, wherein the first transmission shaft or the second transmission shaft is connected to an output shaft of the driving device, and the driving device is an internal combustion engine or an electric motor.

16. A method for multi-stage continuous polymer injection using a belt-driven synchronous polymer injection device, characterized in that: The following steps are involved: S1. Connect the first transmission shaft or the second transmission shaft to the damping adjustment mechanism, connect the polymer liquid inlet pipe to the liquid inlet of the plunger seat, and connect the polymer output pipe to the liquid discharge port of the plunger seat; adjust the resistance through the damping adjustment mechanism according to the construction requirements; S2, press the polymer, the intermittent reversing mechanism connects the plunger seat liquid inlet with the piston sleeve, the polymer enters the piston sleeve through the plunger seat liquid inlet, pushes the first piston to move backward, and the first transmission shaft rotates. The first transmission shaft drives the second transmission shaft through the transmission mechanism, so that the intermittent reversing mechanism switches, disconnects the plunger seat liquid inlet from the piston sleeve, and connects the plunger seat liquid discharge port with the piston sleeve; S3, the first transmission shaft continues to rotate, pushing the first piston forward, so that the polymer in the piston sleeve enters the polymer output pipe and is injected into the formation, the intermittent reversing mechanism switches, the plunger seat liquid inlet is connected to the piston sleeve, the plunger seat liquid outlet is disconnected from the piston sleeve, and the circulation operation begins.

17. A method for multi-stage continuous polymer injection using a belt-driven synchronous polymer injection device according to claim 16, characterized in that: Adjust the braking torque through the brakes; There is a small-diameter contact between the cam and the adjusting rod. When the lower sealing ring seals the liquid discharge port of the plunger seat, the upper sealing ring is above the liquid inlet of the plunger seat, and the piston port is above the lower sealing ring, the movement path of the polymer is that the polymer enters the interior of the plunger seat, passes through the cavity between the upper and lower sealing rings to reach the piston port, enters the piston sleeve to push the first piston to move backward, drives the crankshaft to rotate, the crankshaft drives the transmission belt to rotate, and the transmission belt drives the camshaft to rotate, so that the contact between the cam and the adjusting rod changes from a small-diameter contact to a large-diameter contact, the liquid inlet and discharge plunger moves downward, the upper sealing ring seals the liquid inlet of the plunger seat, the lower sealing ring is below the liquid discharge port of the plunger seat, and the piston port is below the upper sealing ring; At this time, the crankshaft continues to rotate, pushing the first piston forward, causing the polymer in the piston sleeve to pass through the piston port, through the cavity between the upper and lower sealing rings to reach the plunger seat drain port, enter the polymer output pipe, and be injected into the formation. The contact between the cam and the adjusting rod changes from large diameter to small diameter, and the cycle starts.

18. A method for continuous polymer injection using a belt-driven synchronous polymer injection device, characterized in that: The following steps are involved: S1, connecting the first transmission shaft or the second transmission shaft to the output shaft of the driving device, connecting the polymer liquid inlet pipe to the liquid inlet of the plunger seat, and connecting the polymer output pipe to the liquid discharge port of the plunger seat; S2, start the driving device, the first transmission shaft and the second transmission shaft start to rotate synchronously under the action of the rotating mechanism, the intermittent reversing mechanism connects the plunger seat liquid inlet with the piston sleeve, the first piston moves backward, generates negative pressure, and the polymer enters the piston sleeve through the plunger seat liquid inlet, the second transmission shaft continues to rotate, the intermittent reversing mechanism switches, the plunger seat liquid inlet is disconnected from the piston sleeve, and the plunger seat liquid discharge port is connected to the piston sleeve; S3, the first transmission shaft continues to rotate, pushing the first piston forward, so that the polymer in the piston sleeve enters the polymer output pipe and is injected into the formation, the intermittent reversing mechanism switches, the plunger seat liquid inlet is connected to the piston sleeve, the plunger seat liquid outlet is disconnected from the piston sleeve, and the circulation operation begins.

19. The continuous polymer injection method of the belt-driven synchronous polymer injection device according to claim 18, characterized in that: The driving device is an internal combustion engine or an electric motor; When the first transmission shaft rotates, the crankshaft drives the first piston to move backward, generating negative pressure. At this time, the cam and the adjusting rod are in small-diameter contact, the upper sealing ring is above the plunger seat liquid inlet, and the piston mouth is above the lower sealing ring. The polymer enters the inside of the plunger seat, passes through the cavity between the upper and lower sealing rings to reach the piston mouth, and enters the piston sleeve. At the same time, the camshaft rotates, so that the cam and the adjusting rod are in contact from small diameter to large diameter, and the liquid inlet and outlet plunger moves downward; the upper sealing ring seals the plunger seat liquid inlet, the lower sealing ring is below the plunger seat liquid outlet, and the piston mouth is below the upper sealing ring; The crankshaft continues to rotate, pushing the first piston forward, causing the polymer in the piston sleeve to pass through the piston port, through the cavity between the upper and lower sealing rings to reach the plunger seat drain port, enter the polymer output pipe, and be injected into the formation. The contact between the cam and the adjusting rod changes from large diameter to small diameter, and the cycle starts.

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