Polymer ground injection allocation device

Abstract

The utility model relates to a method or equipment for improving oil and gas exploitation through chemicals, in particular to a polymer ground injection allocation device. According to the polymer ground injection allocator, the inverted-cone-shaped annular space with the large upper portion and the small lower portion is formed between the injection allocation sleeve and the injection allocation core, and meanwhile in the direction from top to bottom, the size of the section of at least part of the annular groove close to the upper end is gradually changed from large to small; the size of the section of the annular groove in the lower side is not larger than that of the section of the annular groove in the upper side, so that when the polymer flows through the annular grooves from top to bottom to flow to the polymer outlet through the inverted-cone-shaped annulus, the flow choking and pressurizing effects are gradually changed, the shearing rate of the polymer is low, and loss of the polymer is reduced; the adjusting device is an electrically-driven adjusting device, real-time adjustment and control can be achieved, and accurate injection allocation is achieved.

Description

Technical Field

[0001] The utility model relates to a method or equipment for improving oil and gas production through chemicals, in particular to a polymer ground dispenser. Background Art

[0002] Most of the polymer flooding targets in domestic oil fields have gradually shifted from Class I oil layers to Class II and III oil reservoirs. Due to the large difference in permeability between different layers of the reservoir, when injected in general, the oil layers with low permeability and poor oil layer development have low utilization, and the high permeability layer has serious crossflow. Therefore, in order to alleviate the interlayer contradictions that occur during polymer injection, improve the suction profile, and increase the utilization of poor oil layers, the split injection process is now mostly adopted. The injection volume of the high permeability section is controlled by the polymer surface dispenser, the pressure is increased, and the injection volume of the low permeability section is increased, which has achieved good results.

[0003] For example, a Chinese utility model patent with authorization announcement number CN203383800U discloses a low-shear dispenser, which includes a dispenser core inserted in a dispenser sleeve, one end of the annular gap is connected to the polymer inlet, and the other end is connected to the polymer outlet. An annular gap is provided between the outer circumference of the dispenser core and the inner wall of the dispenser sleeve. The dispenser core is an inverted cone, and the end of the inverted conical dispenser core close to the polymer inlet is a large head end, and the end close to the polymer outlet is a small head end. An annular groove with a concave arc cross-section is provided on the outer circumference of the dispenser core, and the annular grooves are evenly distributed on the outer circumference of the dispenser core. The size of the annular gap can be adjusted by driving the dispenser core to move axially relative to the dispenser sleeve through an adjusting device, thereby adjusting the resistance increasing and flow limiting effect, as well as the function of controlling the polymer flow rate.

[0004] However, since the annular grooves on the outer peripheral surface of the injection core of the above-mentioned dispenser are evenly arranged in the axial direction, when the relative position of the injection core is adjusted axially relative to the injection sleeve, the shear rate of the polymer flowing through the annular gap is still relatively large, resulting in a decrease in polymer viscosity. In addition, the above-mentioned dispenser manually adjusts the injection core, which is not timely, and since the pressure of the water injection system fluctuates frequently, the injection volume often changes greatly, exceeding the injection range, and blockage cannot be found, which has a great impact on production. Utility Model Content

[0005] The utility model aims to provide a polymer ground dispenser to solve the problem that the existing dispenser has a large shear rate for the polymer, resulting in serious polymer loss.

[0006] The polymer ground dispenser of the utility model comprises an injection sleeve and an injection core, and an inverted conical annulus with a larger upper part and a smaller lower part is provided between the two. At least one of the injection core and the injection sleeve is provided with annular grooves arranged at intervals in the axial direction. In the direction from top to bottom, the cross-sectional size of at least part of the annular grooves close to the upper end gradually changes from large to small, and the cross-sectional size of the annular groove on the lower side is not larger than the cross-sectional size of the annular groove on the upper side.

[0007] Furthermore, the cross-sectional dimensions of all the annular grooves from top to bottom gradually change from large to small.

[0008] Furthermore, the adjusting device for adjusting the axial position of the dispensing core provided in the dispensing machine is an electrically driven adjusting device.

[0009] Furthermore, the electric drive regulating device is provided with a controller, and the controller is used to control the electric drive regulating device to adjust the axial relative position between the dispensing core and the dispensing sleeve according to the comparison result between the actual flow value of the polymer and the set flow value.

[0010] Furthermore, the electric drive adjustment device includes a drive motor and a screw transmission mechanism.

[0011] Furthermore, the spiral transmission mechanism includes a fixed screw sleeve sealed on the upper end of the dispensing sleeve and a driving screw installed in the fixed screw sleeve. The driving motor is installed above the fixed screw sleeve, the driving motor is connected to the driving screw in a transmission manner, and the driving screw is assembled together with the dispensing core in an axially fixed and circumferentially rotating manner.

[0012] Furthermore, the driving motor and the injection sleeve are relatively fixedly arranged, and the output end of the driving motor and the driving screw are assembled together in an axially sliding and circumferentially non-rotatable manner.

[0013] Furthermore, an outer protective tube is fixedly installed on the upper end of the fixed screw sleeve, a driving motor is fixedly installed on the upper end of the outer protective tube, a transmission sleeve is installed on the output end of the driving motor, a sliding groove extending up and down is opened on the side wall of the transmission sleeve, and a anti-rotation slider is fixedly installed on the upper end of the driving screw, the anti-rotation slider extends into the sliding groove and is guided and slidably matched with the transmission sleeve in the up and down directions, and is anti-rotated in the circumferential direction.

[0014] Furthermore, a thrust bearing is provided between the opposite ends of the transmission sleeve and the fixed screw sleeve.

[0015] Furthermore, an assembly hole is provided at the upper end of the dispensing core, and an assembly head is provided at the lower end of the driving screw. The assembly head extends into the assembly hole, and an inner stop ring is installed in the upper end hole of the assembly hole. The assembly head has a stop mating end opposite to the inner stop ring up and down, and a thrust bearing is clamped between the inner stop ring and the stop mating end.

[0016] The utility model provides an inverted cone annulus between the dispensing sleeve and the dispensing core of the polymer ground dispensing device, which is larger at the top and smaller at the bottom. At the same time, in the direction from top to bottom, the cross-sectional size of at least part of the annular groove close to the upper end gradually changes from large to small, and the cross-sectional size of the annular groove on the lower side is not larger than the cross-sectional size of the annular groove on the upper side. In this way, when the polymer flows from top to bottom through the annular groove to the polymer outlet through the inverted cone annulus, after the polymer solution passes through a plurality of annular arc grooves, the contact area between the fluid and the rigid body increases, the fluid morphology changes, and the vortex increases the flow resistance, generating The larger pressure drop forms a cumulative pressure difference between the polymer inlet and the polymer outlet, which reduces the flow capacity of the polymer and achieves the purpose of controlling the flow rate. At the same time, due to the larger area of ​​the conical annulus, the flow rate of the unit polymer is low, the shear rate is low, and the annular groove gradually becomes smaller from top to bottom, then the radius decreases, the cross-sectional area decreases, and the shear stress becomes smaller. Therefore, the viscosity loss rate of the polymer solution is low, so that the polymer viscosity is effectively retained, thereby retaining the oil recovery effect of the polymer during injection; furthermore, the polymer flow rate changes from high to low, which is conducive to the recovery of the polymer molecular chain and reduces the shear rate of the polymer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A half-section diagram of the first embodiment of the polymer dispensing device of the present invention;

[0018] Figure 2 for Figure 1 A magnified view of the structure at center A;

[0019] Figure 3 for Figure 1 Cross-sectional view at point M in the middle.

[0020] In the figure: 1. instrument box; 2. PLC control circuit board; 3. drive motor; 4. fixing bolt; 5. connecting bolt; 6. outer protective tube; 7. force transmission sleeve; 8. anti-rotation key; 9. anti-rotation slider; 10. slide groove; 11. first thrust bearing; 12. drive screw; 13. fixing screw sleeve; 14. first sealing ring; 15. second sealing ring; 16. upper end of sleeve body; 17. inner retaining ring; 18. set screw; 19. second thrust bearing; 20. polymer inlet; 21. inverted cone annulus; 22. injection core; 23. injection sleeve; 24. annular groove; 30. polymer outlet. DETAILED DESCRIPTION

[0021] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0022] The polymer surface dispenser of the utility model is mainly aimed at improving the problem that the existing polymer surface dispenser has a high shear rate on the polymer during use, resulting in a low polymer viscosity and affecting the injection effect. Mainly, the polymer surface dispenser of the utility model, through the dispenser sleeve 23 and the dispenser core 22, jointly encloses an inverted conical annulus 21 with a large upper part and a small lower part. At the same time, in the direction from top to bottom, the cross-sectional size of at least part of the annular groove 24 close to the upper end gradually changes from large to small, and the cross-sectional size of the annular groove 24 on the lower side is not greater than the cross-sectional size of the annular groove 24 on the upper side. The polymer inlet 20 is located above the inverted conical annulus 21, and the polymer outlet 30 is located below the inverted conical annulus 21. In this way, when the polymer flows from the conical annulus to the polymer outlet 30 from top to bottom, it will pass through the annular grooves 24 in sequence, and when flowing through different annular grooves 24, it flows from the annular groove 24 with a larger cross-sectional size to the annular groove 24 with a smaller cross-sectional size in sequence, so that the flow resistance and pressurization effect can be gradually increased, the shear rate of the polymer is low, and the loss of the polymer is reduced.

[0023] Specifically, based on the above concepts, a variety of different embodiments are provided below to illustrate the polymer dispenser of the present invention.

[0024] like Figure 1-3 As shown, the polymer surface dispenser of this embodiment includes a dispenser sleeve 23 and a dispenser core 22 inserted in the dispenser sleeve 23. A radially extending external pipe is connected to the dispenser sleeve 23 near the upper end. The external pipe is connected to the inner cavity of the dispenser sleeve 23. The pipe mouth of the external pipe is a polymer inlet 20. An annular space is provided between the dispenser core 22 and the dispenser sleeve 23. The dispenser sleeve 23 is a tubular structure as a whole, and the pipe mouth at the lower end thereof constitutes a polymer outlet 30. The outer side surface of the dispenser sleeve 23 is a cylindrical surface, and the inner side surface is an inner conical surface. The dispenser core 22 is a solid columnar structure and the outer side surface is an outer conical surface. The outer conical surface of the dispenser core 22 and the inner conical surface of the dispenser sleeve 23 have the same cone angle, and the annular space formed between the two is an inverted conical annulus 21 with a larger upper portion and a smaller lower portion. An adjusting device is provided at the upper end of the injection sleeve 23, which is used to adjust the axial position of the injection core 22, and then adjust the size of the inverted cone annulus 21, so as to adjust the flow resistance and pressurization effect of the polymer and the polymer flow rate. The adjusting device can adopt the structural form in the prior art.

[0025] A plurality of annular grooves 24 are provided on the outer conical surface of the injection core 22. The annular grooves 24 are arranged at intervals in the axial direction, and the cross-sectional size of each annular groove 24 gradually changes from large to small in the direction from top to bottom. In this way, in the process of the polymer flowing from the polymer inlet 20 to the polymer outlet 30, not only the flow area of ​​the conical annulus gradually decreases, but also the cross-sectional size of the annular groove 24 gradually decreases, which can achieve a better flow resistance and pressure increase effect. At the same time, such a setting reduces the shear rate of the polymer, reduces the loss of the polymer, and ensures the injection effect.

[0026] Of course, in other embodiments, considering that the length of the dispensing core 22 is relatively long and the number of the annular grooves 24 thereon is relatively large, in order to reduce the manufacturing difficulty to a certain extent, the cross-sectional size of the partial annular groove 24 close to the polymer inlet 20, that is, the partial annular groove 24 at the upper end of the dispensing core 22 (which may be referred to as the upper annular groove 24) may gradually change from large to small, and the cross-sectional size of the annular groove 24 below the upper annular groove 24 (which may be referred to as the lower annular groove 24) may be the same and not larger than the cross-sectional size of the upper annular groove 24.

[0027] On the basis of the above-mentioned embodiments, a more preferred embodiment is provided below. This embodiment mainly improves the adjustment device to solve the limitation that the manual adjustment of the prior art dispenser is very inconvenient and can only be used on the ground. The adjustment device of this embodiment is an electric drive adjustment device, which can achieve more convenient and flexible adjustment control through electric drive adjustment, and does not require manual on-site operation. In a more optimized setting, the electric drive adjustment device is equipped with a controller, such as a PLC control circuit board 2, and the controller is used to control the electric drive adjustment device to adjust the axial relative position between the injection core 22 and the injection sleeve 23 according to the comparison result between the actual flow value of the polymer and the set flow value, so that closed-loop control can be achieved, and the flow control of the polymer is more accurate. Specifically, the PLC control circuit board 2 is pre-installed with a control system, and the flow range and adjustment step are pre-set. The PLC control circuit board 2 is connected to an electromagnetic flowmeter for detecting the actual flow of the polymer, obtains its pulse signal, monitors the flow size, and issues an adjustment instruction according to the comparison result between the actual flow size and the preset flow size.

[0028] Regarding the driving part of the adjusting device that drives the dispensing core 22 to move, the present embodiment adopts a spiral driving form with a simple structure and high adjustment accuracy, including a driving motor 3 and a spiral transmission mechanism driven by the driving motor 3. Specifically, Figure 1-3As shown, the upper end of the injection sleeve 23 is sealed with a fixed screw sleeve 13, the fixed screw sleeve 13 is inserted in the injection sleeve 23 and a first sealing ring 14 is provided between the two, a driving screw 12 is installed in the fixed screw sleeve 13, the fixed screw sleeve 13 and the driving screw 12 are threadedly matched, an outer protective tube 6 is fixedly installed on the upper end 16 of the sleeve body of the fixed screw sleeve 13, the driving motor 3 is fixedly connected to the upper port of the outer protective tube 6 by means of mounting bolts, the upper end of the outer protective tube 6 is also connected to the instrument box 1 by means of connecting bolts 5, so as to set the overall sealing cover of the driving motor 3 inside, the controller is installed in the instrument box 1 and is control-connected to the driving motor 3, and a power module is also installed in the instrument box 1 for power supply.

[0029] The rotating output end of the driving motor 3 is arranged toward the outer protective tube 6, and is connected with a force transmission sleeve 7 for rotation prevention. The force transmission sleeve 7 is entirely in the outer protective tube 6, and is transmission-connected with one end of the driving screw 12 extending into the outer protective tube 6, and the lower end of the driving screw 12, that is, the end extending into the dispensing sleeve 23, is connected with the dispensing core 22. Since the driving motor 3 is fixedly arranged relative to the dispensing sleeve 23, the force transmission sleeve 7 and the driving screw 12 are assembled together in an axially sliding and circumferentially rotation-proof manner, so that when the force transmission sleeve 7 is driven to rotate by the motor, the force transmission sleeve 7 can drive the driving screw 12 to rotate, and since the driving screw 12 is threadedly matched with the fixed screw sleeve 13, the driving screw 12 will move in the axial direction while rotating, thereby realizing the axial position adjustment of the dispensing core 22.

[0030] As an assembly method for realizing axial sliding and circumferential rotation stop between the output end of the driving motor 3 and the driving screw 12, in this embodiment, a sliding groove 10 extending up and down is provided on the side wall of the transmission sleeve, and a rotation stop slider 9 is provided on the upper end of the driving screw 12, and a rotation stop key 8 is provided between the rotation stop slider 9 and the driving screw 12 to ensure the circumferential rotation stop between the driving screw 12 and the rotation stop slider 9. The rotation stop slider 9 extends into the sliding groove 10 and cooperates with the transmission sleeve in the vertical direction for guiding sliding, and in the circumferential direction for rotation stop, so that when the force transmission sleeve 7 rotates, the rotation stop slider 9 can be driven to rotate, and then the driving screw 12 can be driven to rotate. Of course, in other embodiments, the assembly method for realizing axial sliding and axial rotation stop between the output end of the driving motor 3 and the driving screw 12 can also be provided with an insertion hole on the upper end surface of the driving screw 12, the insertion hole is a spline hole, and a rotation stop spline is installed on the output end of the driving motor 3, and the rotation stop spline is inserted into the insertion hole and can slide axially relative to the insertion hole.

[0031] As an optimized implementation, in order to prevent the polymer from leaking through the position between the drive screw 12 and the fixed screw sleeve 13 after entering the injection sleeve 23, in this embodiment, the drive screw 12 and the fixed screw are provided with a smooth mating section below the threaded mating position of the two, and a second sealing ring 15 is provided at the smooth mating section to ensure the seal between the two.

[0032] As an optimized implementation, in order to make the rotation of the force transmission sleeve 7 more stable, a first thrust bearing 11 is provided between the opposite ends of the force transmission sleeve 7 and the fixed screw sleeve 13. The first thrust bearing 11 is clamped between the force transmission sleeve 7 and the fixed screw sleeve 13 to ensure that the position of one end of the force transmission sleeve 7 away from the drive motor 3 is stable and does not affect the rotation.

[0033] On the basis of the above embodiments, a preferred embodiment is provided below, which mainly provides a preferred design for the connection between the driving screw 12 and the dispensing core 22. In some embodiments, the driving screw 12 and the dispensing core 22 can be directly fixedly connected, so that when the driving screw 12 rotates and moves up and down, it can drive the dispensing core 22 to move up and down, but in this way, the dispensing core 22 also rotates, resulting in an increase in the load of the driving motor 3. In this embodiment, Figure 1 As shown, the upper end of the dispensing core 22 is provided with an assembly hole, which is a blind hole, and the lower end of the driving screw 12 is provided with an assembly head, which extends into the assembly hole, and an inner retaining ring 17 is fixedly installed in the upper end of the assembly hole. The inner retaining ring 17 can be screwed into the assembly hole through threads and locked by radial set screws 18. The assembly head has an outer flange, which forms a stopper matching end opposite to the inner retaining ring 17, and a second thrust bearing 19 is sandwiched between the inner retaining ring 17 and the stopper matching end. Such a structure is equivalent to the dispensing core 22 being rotatably mounted on the lower end of the driving screw 12, so that when the driving screw 12 rotates and rises and falls, the dispensing core 22 can only rise and fall with it without rotating, thereby reducing the load of the driving motor 3.

[0034] When the polymer ground dispenser of the utility model is used, the driving motor 3 drives the force transmission sleeve 7 to rotate, and the force transmission sleeve 7 transmits the rotational force to the anti-rotation slider 9. The anti-rotation slider 9 rotates and moves axially on the slide groove 10. The anti-rotation slider 9 is connected to the driving screw 12 through the anti-rotation key 8. The anti-rotation slider 9 drives the driving screw 12 to rotate and moves axially at the same time; the dispensing core 22 is rotatably mounted on the lower end of the driving screw 12 through the second thrust bearing 19, and moves axially with the driving screw 12 to adjust the size of the annular space, thereby achieving the purpose of controlling the polymer flow rate.

[0035] The control system of the polymer surface dispenser of the utility model can control the actual flow rate within a certain range, monitor the flow rate change in real time through the intelligent control system, and control the driving motor 3 to drive the dispensing core 22 to make axial movement through the controller. When the actual flow rate is greater than the set flow rate, the PLC control circuit board 2 receives the pulse signal sent by the electromagnetic flowmeter, controls the driving motor 3 to rotate forward, the dispensing core 22 moves down, the annular space is reduced, and the flow rate is reduced; conversely, when the actual flow rate is less than the set flow rate, the driving motor 3 reverses, the dispensing core 22 moves up, the annular space is increased, and the flow rate is increased, realizing the function of intelligently dispensing the polymer flow rate.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A polymer surface dispenser, comprising a dispenser sleeve and a dispenser core, with an inverted conical annulus between the two, which is larger at the top and smaller at the bottom, and at least one of the dispenser core and the dispenser sleeve is provided with annular grooves spaced apart in the axial direction, characterized in that: In the direction from top to bottom, the cross-sectional size of at least part of the annular groove close to the upper end gradually changes from large to small, and the cross-sectional size of the annular groove on the lower side is not larger than the cross-sectional size of the annular groove on the upper side.

2. The polymer ground dispenser according to claim 1, characterized in that: The cross-sectional dimensions of all the annular grooves from top to bottom gradually change from large to small.

3. The polymer ground dispenser according to claim 1 or 2, characterized in that: The adjusting device for adjusting the axial position of the dispensing core provided on the dispensing machine is an electrically driven adjusting device.

4. The polymer ground dispenser according to claim 3, characterized in that: The electric drive regulating device is equipped with a controller, and the controller is used to control the electric drive regulating device to adjust the axial relative position between the dispensing core and the dispensing sleeve according to the comparison result between the actual flow value of the polymer and the set flow value.

5. The polymer ground dispenser according to claim 3, characterized in that: The electric drive adjustment device comprises a drive motor and a screw transmission mechanism.

6. The polymer surface dispenser according to claim 5, characterized in that: The spiral transmission mechanism includes a fixed screw sleeve sealed on the upper end of the dispensing sleeve and a driving screw installed in the fixed screw sleeve. The driving motor is installed above the fixed screw sleeve. The driving motor is connected to the driving screw in a transmission manner. The driving screw is assembled with the dispensing core in an axially fixed and circumferentially rotating manner.

7. The polymer surface dispenser according to claim 6, characterized in that: The driving motor and the injection sleeve are relatively fixedly arranged, and the output end of the driving motor and the driving screw are assembled together in an axially sliding and circumferentially non-rotatable manner.

8. The polymer ground dispenser according to claim 7, characterized in that: An outer protective tube is fixedly installed on the upper end of the fixed screw sleeve, a driving motor is fixedly installed on the upper end of the outer protective tube, a transmission sleeve is installed on the output end of the driving motor, a sliding groove extending up and down is opened on the side wall of the transmission sleeve, a rotation-stopping slider is fixedly installed on the upper end of the driving screw, the rotation-stopping slider extends into the sliding groove and is guided and slidably matched with the transmission sleeve in the up and down directions, and is rotation-stopped in the circumferential direction.

9. The polymer surface dispenser according to claim 8, characterized in that: A thrust bearing is arranged between the opposite ends of the transmission sleeve and the fixed screw sleeve.

10. The polymer surface dispenser according to claim 6, characterized in that: An assembly hole is provided at the upper end of the dispensing core, and an assembly head is provided at the lower end of the driving screw. The assembly head extends into the assembly hole, and an inner stop ring is installed in the upper end hole of the assembly hole. The assembly head has a stop mating end opposite to the inner stop ring up and down, and a thrust bearing is clamped between the inner stop ring and the stop mating end.

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