A smart oilfield injection rotation and refueling device

Abstract

This invention relates to the field of oilfield injection and discloses an intelligent oilfield injection alternation injection device, comprising at least two storage tanks, two metering pumps, an injection pipeline system, an alternating injection control system, and a self-cleaning system. A predetermined number of storage tanks are connected to the suction end of one metering pump, and the remaining storage tanks are connected to the suction end of the other metering pump. Both metering pumps are connected to the injection pipeline system, which is used to inject injection agents into oil wells in the oilfield. The alternating injection control system controls the start and stop of the two metering pumps. The self-cleaning system provides cleaning fluid to the metering pumps. While one metering pump is delivering injection agents to the injection pipeline system, the alternating injection control system also controls the other metering pump to connect to the self-cleaning system and continuously start the metering pump for a predetermined duration. This invention has both low construction costs and excellent injection performance.

Description

Technical Field

[0001] This invention relates to the field of oilfield injection, specifically to an intelligent oilfield injection rotation and injection device. Background Technology

[0002] In the process of enhancing oil recovery (EOR) through chemical flooding in oilfields, injection rotation equipment is the core surface equipment for realizing the alternating slug injection of multiple agents such as polymers, surfactants, and alkali solutions. Currently, the mainstream injection equipment is divided into two categories: multi-pump independent control systems and shared pump + multi-way valve systems.

[0003] The multi-pump independent control system equips each type of agent with an independent metering pump, switching agents by starting and stopping the pumps and opening and closing valves. While this solution offers high reliability, it requires significant investment (the number of pumps is directly proportional to the type of agent) and occupies a substantial amount of floor space.

[0004] Among them, the shared pump + multi-way valve system: a single metering pump is used in conjunction with a multi-way selector valve to switch the source of the agent. Although this reduces the hardware cost, it has at least the following drawbacks: 1. Large mixing disturbance: valve dead zone (50-200 mL) and pipeline residues cause cross-contamination between new and old agents, and the concentration fluctuation in the mixing section exceeds ±30%; 2. Pump start-up or valve action causes water hammer effect (pressure transient >15%), and the flow recovery of high viscosity agents (such as HPAM solution) takes 8-12 seconds.

[0005] Therefore, existing refueling equipment suffers from a trade-off between construction costs and refueling effectiveness. Summary of the Invention

[0006] The purpose of this invention is to provide an intelligent oilfield injection rotation and refueling device that solves the problem that existing refueling devices cannot simultaneously achieve both high construction costs and effective refueling.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0008] In a first aspect, the present invention provides an intelligent oilfield injection rotation and replenishment device, comprising:

[0009] There are at least two storage tanks, each containing an injection solution, and the types of injection solutions in each storage tank are different.

[0010] Two metering pumps are used. A preset number of storage tanks in all storage tanks are connected to the suction end of one of the metering pumps, and the remaining storage tanks are connected to the suction end of the other metering pump.

[0011] An injection pipeline system, to which two metering pumps are connected, is used to inject injectants into oil wells in the oil field;

[0012] An alternating injection control system, electrically connected to two metering pumps, is used to control the start and stop of the two metering pumps to alternately deliver multiple types of injection agents into the injection pipeline system;

[0013] The self-cleaning system is used to provide cleaning fluid to the metering pump. While one of the metering pumps is delivering the injection agent into the injection pipeline system, the alternating injection control system is also used to control another metering pump to connect to the self-cleaning system and continuously start the metering pump for a preset time.

[0014] Preferably, each metering pump has a first common pipe connected to its suction end, and multiple suction pipes are connected to the pipe body of the first common pipe. Each suction pipe is connected to a corresponding storage tank, and a first control valve is installed at the end of each suction pipe.

[0015] Each metering pump is connected to a three-way control valve at its output end. The first output end of the three-way control valve is connected to the self-cleaning system, and the second output end of the three-way control valve is connected to the injection pipeline system.

[0016] Preferably, the injection pipeline system includes a second common pipe, and the second output ends of the three-way control valves connected to the two metering pumps are both connected to the second common pipe. Multiple branch pipes are connected to the common pipe, and each branch pipe is equipped with a second control valve. Each branch pipe is used to inject injection agent into an oil well.

[0017] Preferably, the self-cleaning system has two independent cleaning units. Each cleaning unit includes a storage tank, a cleaning fluid delivery pipe, and a recovery pipe. The storage tank stores cleaning fluid, and each cleaning fluid delivery pipe is equipped with a third control valve.

[0018] In any set of cleaning units, one end of the cleaning fluid delivery pipe is connected to the storage tank, and the other end is connected to the input end of the first common pipe connected to a metering pump; one end of the recovery pipe is connected to the storage tank, and the other end is connected to the first output end of the three-way control valve connected to a metering pump.

[0019] Preferably, the alternating injection control system includes: a controller, a metering pump driver, a three-way control valve driver, a first control valve driver, a second control valve driver, and a third control valve driver, wherein the three-way control valve driver, the first control valve driver, the second control valve driver, and the third control valve driver are all electrically connected to the controller;

[0020] The three-way control valve driver is electrically connected to the three-way control valve and is used to drive the three-way control valve to open or close.

[0021] The first control valve driver is electrically connected to the first control valve and is used to drive the first control valve to open or close.

[0022] The second control valve driver is electrically connected to the second control valve and is used to drive the second control valve to open or close.

[0023] The third control valve driver is electrically connected to the third control valve and is used to drive the third control valve to open or close.

[0024] Preferably, the liquid storage tank is divided into a return liquid zone, a clean water zone, and a replenishment liquid zone. The return liquid zone and the clean water zone, as well as the clean water zone and the replenishment liquid zone, are separated by partitions. The top of the return liquid zone has an inlet for connecting to a recovery pipe. The bottom of the clean water zone has a drain outlet for connecting to a cleaning fluid delivery pipe. The partition between the return liquid zone and the clean water zone has an opening, and a filter assembly is installed in the opening.

[0025] The replenishment zone is equipped with a replenishment component that draws cleaning fluid into the clean water zone. The alternating injection control system is also used to control the replenishment component to draw cleaning fluid into the clean water zone.

[0026] Preferably, the return liquid zone is used for the cleaning liquid recovered by the sediment recovery pipe. The return liquid zone is equipped with a sewage discharge assembly for automatically discharging the sediment at the bottom of the return liquid zone. The sewage discharge assembly includes: a sewage discharge pipe and a suction hood set at the bottom of the return liquid zone. The sewage discharge pipe has an inverted U-shaped structure. The inner end of the sewage discharge pipe is connected to the suction hood. The outer end of the sewage discharge pipe extends through the tank wall of the return liquid zone to the outside of the storage tank. A through hole is provided at the upper part of the sewage discharge pipe located in the return liquid zone. A sliding sleeve is slidably connected to the sewage discharge pipe. A float plate is provided on the sliding sleeve. A limiting part is provided on the sewage discharge pipe located above the through hole.

[0027] When the sliding sleeve abuts against the limiting part after the float plate floats up, the through hole is located inside the sliding sleeve;

[0028] The distance between the outer end of the drain pipe and the bottom of the storage tank is less than the distance between the through hole and the bottom of the storage tank;

[0029] The return liquid zone is equipped with a detector for detecting the thickness of the precipitate. The detector uploads the detected precipitate thickness to the controller of the alternating injection control system.

[0030] Preferably, both the clear water zone and the replenishment zone are equipped with level sensors. The level sensors are used to detect the level of liquid in the clear water zone and the replenishment zone, and upload the detected level information to the controller of the alternating injection control system.

[0031] Preferably, a sludge storage tank is provided on the outside of the liquid storage tank, and the outer end of the drain pipe is located inside the sludge storage tank.

[0032] Preferably, the suction hood is funnel-shaped, with its bottom placed on the inner bottom wall of the return liquid area, and a notch provided on the edge of the suction hood.

[0033] The beneficial effects of this invention are mainly reflected in:

[0034] 1. The dispensing device of the present invention is equipped with two metering pumps, which can significantly reduce construction costs compared to deploying one metering pump for each type of injection.

[0035] 2. The dispensing equipment of the present invention also deploys a self-cleaning system and an alternating injection control system. When one metering pump is dispensing, if another metering pump has already performed the dispensing operation, the alternating injection control system controls the metering pump to start, and the self-cleaning system provides cleaning fluid to the metering pump to clean the residue of the old dispensing agent in the metering pump. This can reduce cross-contamination between new and old agents and reduce concentration fluctuations in the mixing section. Therefore, the present invention has both low construction costs and better dispensing effect. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a schematic diagram of the overall structure of an intelligent oilfield injection rotation and refueling device provided in one embodiment of the present invention;

[0038] Figure 2 This is a block diagram of an alternating injection control system provided in one embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the internal structure of a liquid storage tank provided in one embodiment of the present invention;

[0040] Legend: 1. Storage tank; 2. Metering pump; 3. First common pipe; 4. Suction pipe; 5. First control valve; 6. Three-way control valve; 7. Second common pipe; 8. Branch pipe; 9. Second control valve; 12. Storage tank; 13. Cleaning fluid delivery pipe; 14. Recovery pipe; 15. Third control valve; 16. Return liquid area; 17. Clean water area; 18. Replenishment liquid area; 19. Baffle; 20. Inlet; 21. Drain outlet; 22. Opening; 23. Filter assembly; 24. Sludge suction hood; 25. Drain pipe; 27. Through hole; 28. Sliding sleeve; 29. ​​Float; 30. Limiting part; 31. Detector; 32. Liquid level sensor; 33. Sludge storage tank; 34. Notch; 35. Replenishment pump; 36. First replenishment liquid pipe; 37. Second replenishment liquid pipe. Detailed Implementation

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0042] Example 1

[0043] Figure 1 This is a schematic diagram of the overall structure of an intelligent oilfield injection rotation and replenishment device provided in one embodiment of the present invention. Figure 1 As shown in the figure, this embodiment provides an intelligent oilfield injection rotation and filling device, including: at least two storage tanks 1, two metering pumps 2, an injection pipeline system, an alternating injection control system, and a self-cleaning system.

[0044] Each storage tank 1 contains a reagent, which can be a polymer, surfactant, alkali, or other agent. The types of reagents in each storage tank 1 are different. A predetermined number of storage tanks 1 are connected to the suction end of one metering pump 2, and the remaining storage tanks 1 are connected to the suction end of another metering pump 2. The predetermined number can be determined by the average number of reagent types. For example, if there are five types of reagents and the average number of the five types of reagents is "2.5", then the predetermined number can be "3". Three storage tanks 1 are connected to one metering pump 2, and the remaining two storage tanks 1 are connected to another metering pump 2.

[0045] Both metering pumps 2 are connected to an injection pipeline system used to inject injectants into oil wells in the oil field. An alternating injection control system is electrically connected to the two metering pumps 2 and is used to control the start and stop of the two metering pumps 2 to alternately deliver various types of injectants to the injection pipeline system. At the same time, a self-cleaning system is used to provide cleaning fluid to the metering pumps 2. When one of the metering pumps 2 is delivering injectants to the injection pipeline system, the alternating injection control system is also used to control the other metering pump 2 to connect to the self-cleaning system and continuously start the metering pump 2 for a preset time.

[0046] Therefore, the dispensing device in this embodiment deploys two metering pumps 2, which significantly reduces construction costs compared to deploying one metering pump 2 for each type of injection. Furthermore, if the other metering pump 2 has already performed a dispensing operation while one metering pump 2 is dispensing, the alternating injection control system controls the metering pump 2 to start, and the self-cleaning system provides cleaning fluid to the metering pump 2 to clean the residue of the old injection in the metering pump 2. This reduces cross-contamination between new and old agents and also reduces concentration fluctuations in the mixing section. Therefore, this invention has both lower construction costs and better dispensing effects.

[0047] As a further optimization of this embodiment, each metering pump 2 has a first common pipe 3 connected to its suction end. Multiple suction pipes 4 are connected to the body of the first common pipe 3, and each suction pipe 4 is connected to a corresponding storage tank 1. A first control valve 5 is installed at the end of each suction pipe 4. A three-way control valve 6 is connected to the output end of each metering pump 2. The first output end of the three-way control valve 6 is connected to the self-cleaning system, and the second output end is connected to the injection pipeline system. In this embodiment, the axis of each suction pipe 4 forms a certain angle with the axis of the first common pipe 3 (i.e., the two have a certain included angle), for example, 30 degrees to 60 degrees. The specific angle can be adjusted according to the number of suction pipes 4 connected to a common pipe. When the number of suction pipes 4 connected to a common pipe is large, a larger angle can be selected. By setting the included angle, the kinetic energy loss of the injected agent in the pipeline can be reduced, thus reducing the load on the metering pump 2.

[0048] As a further optimization of this embodiment, the injection pipeline system includes a second common pipe 7, and the second output ends of the three-way control valves 6 connected to the two metering pumps 2 are both connected to the second common pipe 7. Multiple branch pipes 8 are connected to the common pipe, and each branch pipe 8 is equipped with a second control valve 9. Each branch pipe 8 is used to inject injection agent into an oil well.

[0049] In this embodiment, the first control valve 5, the metering pump 2, the second control valve 9, the third control valve 15, and the three-way control valve 6 are all controlled by the alternating injection control system; the alternating injection operation is uniformly controlled by the alternating injection control system.

[0050] Therefore, as Figure 2 As shown, the alternating injection control system includes: a controller, a metering pump 2 driver, a three-way control valve 6 driver, a first control valve 5 driver, a second control valve 9 driver, and a third control valve 15 driver. The three-way control valve 6 driver, the first control valve 5 driver, the second control valve 9 driver, and the third control valve 15 driver are all electrically connected to the controller.

[0051] The controller can be a PLC (Programmable Logic Controller), and the metering pump 2 can be a hydraulic diaphragm pump (such as the DZW series), which has strong corrosion resistance and high pressure (35MPa), or a plunger pump (JX series), which can be used for high viscosity media (such as asphalt) with pressure up to 350MPa. The model of metering pump 2 can be flexibly selected according to actual needs. The model of metering pump 2 can be selected according to the type of injection. For example, one type of metering pump 2 can be used for high viscosity injections, and another type of metering pump 2 can be used for low viscosity injections.

[0052] Among them, the metering pump 2 driver can be an RDOSE series (Aldos) driver, the three-way control valve 6 driver can be a Spirax Sarco QLM / QLD series driver, and the first control valve 5 driver, the second control valve 9 driver and the third control valve 15 driver can all be DZW45-24T drivers.

[0053] The driver of the three-way control valve 6 is electrically connected to the three-way control valve 6 and is used to drive the three-way control valve 6 to open or close; the driver of the first control valve 5 is electrically connected to the first control valve 5 and is used to drive the first control valve 5 to open or close; the driver of the second control valve 9 is electrically connected to the second control valve 9 and is used to drive the second control valve 9 to open or close; the driver of the third control valve 15 is electrically connected to the third control valve 15 and is used to drive the third control valve 15 to open or close.

[0054] As a further optimization of this embodiment, the self-cleaning system has two independent cleaning units. Each cleaning unit includes a liquid storage tank 12, a cleaning liquid delivery pipe 13 and a recovery pipe 14. The liquid storage tank 12 stores cleaning liquid, and each cleaning liquid delivery pipe 13 is equipped with a third control valve 15.

[0055] In any set of cleaning units, one end of the cleaning fluid delivery pipe 13 is connected to the storage tank 12, and the other end is connected to the input end of the first common pipe 3 connected to a metering pump 2; one end of the recovery pipe 14 is connected to the storage tank 12, and the other end is connected to the first output end of the three-way control valve 6 connected to a metering pump 2.

[0056] Therefore, the injection rotation and administration steps in this embodiment are as follows (using...) Figure 1 For example, there are 4 types of injections, and each metering pump 2 is responsible for injecting two types of injections. The injection sequence from top to bottom is "1", "3", "2", "4").

[0057] Step S1: Use the controller to control the first control valve 5 corresponding to injection "1", start the first metering pump 2 at the same time, and control the three-way control valve 6 to connect the first metering pump 2 with the subsequent injection pipeline system, and inject injection "1" into the subsequent injection pipeline system. Only the controller needs to control the corresponding second control valve 9 to complete the injection operation of injection "1" into any oil well in the oil field.

[0058] Step S2: After injecting the preset amount of injection "1", close the first control valve 5 corresponding to injection "1" and open the first control valve 5 corresponding to injection "2". At the same time, start the second metering pump 2 and control the three-way control valve 6 to connect the second metering pump 2 with the subsequent injection pipeline system and inject injection "2" into the subsequent injection pipeline system. Only the controller needs to control the corresponding second control valve 9 to complete the injection operation of injection "2" into any oil well in the oil field.

[0059] During the injection of injection "2", the first metering pump 2 remains running. At the same time, the third control valve 15 is opened, and the three-way control valve 6 is controlled to connect the first metering pump 2 with the self-cleaning system. The first metering pump 2 draws the cleaning fluid from the self-cleaning system into the first common pipe 3 and itself, so as to continuously clean the residual injection inside the first common pipe 3 and the metering pump 2. After the continuous cleaning time reaches the preset time, the first metering pump 2 is stopped.

[0060] Step S3: After injecting the preset amount of injection "2", close the first control valve 5 corresponding to injection "2" and open the first control valve 5 corresponding to injection "3". At the same time, start the first metering pump 2. At this time, the three-way control valve 6 of the first metering pump 2 is connected to the self-cleaning system. After the first metering pump 2 starts for a preset start time, this method can make the flow rate of the injection stabilize before it is injected into the subsequent injection pipeline system, reducing the water hammer effect caused by pump start-up or valve action. The three-way control valve 6 is connected to the subsequent injection pipeline system. At this time, the first metering pump 2 is connected to the subsequent injection pipeline system to inject injection "3" into the subsequent injection pipeline system. Only the controller needs to control the corresponding second control valve 9 to complete the injection operation of injection "3" into any oil well in the oil field.

[0061] Similarly, the self-cleaning step of the second metering pump 2 is the same as step S1, and the subsequent injection process of the injection "2" is the same as steps S2 and S3.

[0062] In this embodiment, the cleaning fluid can be water. After cleaning, the cleaning fluid will contain polymer residue or inorganic salt crystals (such as CaCO3) precipitate. To improve the utilization rate of the cleaning fluid, it is necessary to treat the cleaning fluid after cleaning. As a further optimization of this embodiment, the storage tank 12 is divided into a return zone 16, a clean water zone 17, and a replenishment zone 18. The return zone 16 and the clean water zone 17, as well as the clean water zone 17 and the replenishment zone 18, are separated by partitions 19. The top of the return zone 16 is provided with an inlet 20, which is used to connect to the recovery pipe 14. The bottom of the clean water zone 17 is provided with a drain 21, which is used to connect to the cleaning fluid delivery pipe 13. The partition 19 between the return zone 16 and the clean water zone 17 has an opening 22, which contains a filter assembly 23.

[0063] The replenishment zone 18 is equipped with a replenishment component that draws cleaning fluid into the clean water zone 17. The alternating injection control system is also used to control the replenishment component to draw cleaning fluid into the clean water zone 17.

[0064] In this embodiment, the storage tank 12 is divided into three areas. The return zone 16 is used to allow the recovered cleaning solution to settle naturally. After settling, the cleaning solution is filtered by the filter assembly 23. The filtered cleaning solution can be reused for cleaning operations, realizing the recycling of the cleaning solution. Furthermore, the replenishment zone 18 can replenish the cleaning solution to the clean water zone 17, avoiding insufficient cleaning solution.

[0065] In this embodiment, the replenishment assembly includes a replenishment pump 35, a first replenishment tube 36, and a second replenishment tube 37. The first replenishment tube 36 is connected to the suction end of the replenishment pump 35, and the second replenishment tube 37 is connected to the output end of the replenishment pump 35. The end of the second replenishment tube 37 away from the replenishment pump 35 is located at the upper part of the clear water zone 17. The replenishment pump 35 in this embodiment is also controlled by the controller of the alternating injection control system.

[0066] As a further optimization of this embodiment, since sediment will gradually accumulate in the return liquid zone 16, in order to discharge these sediments in a timely manner, the return liquid zone 16 is equipped with a sewage discharge component for automatically discharging the sediment from the bottom of the return liquid zone 16, such as... Figure 3As shown, the sewage discharge assembly includes: a sewage discharge pipe 25 and a suction hood 24 disposed at the bottom of the return liquid area 16. The sewage discharge pipe 25 has an inverted U-shaped structure. The inner end of the sewage discharge pipe 25 is connected to the suction hood 24. The outer end of the sewage discharge pipe 25 extends through the wall of the return liquid area 16 to the outside of the storage tank 12. A through hole 27 is provided on the upper part of the sewage discharge pipe 25 located in the return liquid area 16. A sliding sleeve 28 is slidably connected to the sewage discharge pipe 25. A float plate 29 is provided on the sliding sleeve 28. A limiting part 30 is provided on the sewage discharge pipe 25 above the through hole 27. In this embodiment, the limiting part 30 can be a ring of protrusions provided on the sewage discharge pipe 25.

[0067] When the floating plate 29 floats up and the sliding sleeve 28 abuts against the limiting part 30, the through hole 27 is located inside the sliding sleeve 28;

[0068] The distance between the outer end of the drain pipe 25 and the bottom of the liquid storage tank 12 is less than the distance between the through hole 27 and the bottom of the liquid storage tank 12;

[0069] The return liquid zone 16 is equipped with a detector 31 for detecting the thickness of the precipitate. The detector 31 uploads the detected precipitate thickness to the controller of the alternating injection control system.

[0070] In this embodiment, the detector 31 can be an ultrasonic sensor. When the detected thickness reaches a preset thickness, the controller of the alternating injection control system controls the replenishment pump 35 to start. The replenishment pump 35 draws cleaning fluid into the clean water zone 17, causing the liquid level in the clean water zone 17 to rise. At the same time, the liquid level in the return zone 16 rises, and the float 29 rises with the rise in liquid level. When the sliding sleeve 28 contacts the limiting part 30, it restricts the float 29 from rising further. At this time, the sliding sleeve 28 blocks the through hole 27. When the liquid level continues to rise... When the sewage pipe 25 is in the horizontal section, a siphon effect is formed. Since the through hole 27 is blocked, the sediment at the bottom of the return liquid zone 16 can be sucked away. After the siphon effect is formed (at this time, the replenishment pump 35 is stopped or the replenishment flow rate of the replenishment pump 35 is reduced so that the replenishment flow rate is less than the discharge flow rate of the sewage pipe 25), the liquid level drops. After the liquid level drops to a certain depth, the float plate 29 drops in height under the action of gravity. After the through hole 27 is exposed to the sliding sleeve 28, the siphon effect disappears, and the automatic discharge of sediment is completed.

[0071] In this embodiment, the replenishment flow rate of the replenishment pump 35 can be reduced, which can create a siphon effect again and automatically discharge the precipitate multiple times to ensure that the precipitate can be discharged in a timely manner.

[0072] As a further optimization of this embodiment, both the clean water zone 17 and the replenishment zone 18 are equipped with liquid level sensors 32. The liquid level sensors 32 are used to detect the liquid level in the clean water zone 17 and the replenishment zone 18, and upload the detected liquid level information to the controller of the alternating injection control system. When the liquid level in the clean water zone 17 is low, the replenishment pump 35 is started to replenish the cleaning fluid in the clean water zone 17. When the cleaning fluid in the replenishment zone 18 is insufficient, an audible and visual alarm can be used to remind the staff to replenish the cleaning fluid in time.

[0073] As a further optimization of this embodiment, a sludge storage tank 33 is provided on the outside of the liquid storage tank 12, and the outer end of the drain pipe 25 is located inside the sludge storage tank 33; the sludge suction hood 24 is funnel-shaped, the bottom of the sludge suction hood 24 is placed on the inner bottom wall of the return liquid area 16, and the edge of the sludge suction hood 24 is provided with a notch 34. The funnel-shaped structure can suck away sediment over a large area.

[0074] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An intelligent oilfield injection rotation and replenishment device, characterized in that, include: At least two storage tanks (1), each storage tank (1) contains an injection agent, and the types of injection agents in each storage tank (1) are different; Two metering pumps (2), a preset number of storage tanks (1) in all storage tanks (1) are connected to the suction end of one of the metering pumps (2), and the remaining storage tanks (1) are connected to the suction end of the other metering pump (2); The injection pipeline system is connected to two metering pumps (2), which are used to inject injectants into oil wells in the oil field. An alternating injection control system is electrically connected to two metering pumps (2) to control the start and stop of the two metering pumps (2) to alternately deliver multiple types of injection agents to the injection pipeline system; The self-cleaning system is used to provide cleaning fluid to the metering pump (2). When one of the metering pumps (2) delivers the injection agent to the injection pipeline system, the alternating injection control system is also used to control another metering pump (2) to connect to the self-cleaning system and continuously start the metering pump (2) for a preset time. The self-cleaning system has two independent cleaning units. Each cleaning unit includes a storage tank (12), a cleaning fluid delivery pipe (13), and a recovery pipe (14). The storage tank (12) stores cleaning fluid, and each cleaning fluid delivery pipe (13) is equipped with a third control valve (15). In any set of cleaning units, one end of the cleaning fluid delivery pipe (13) is connected to the storage tank (12), and the other end is connected to the input end of the first common pipe (3) connected to a metering pump (2); one end of the recovery pipe (14) is connected to the storage tank (12), and the other end is connected to the first output end of the three-way control valve (6) connected to a metering pump (2); The storage tank (12) is divided into a return liquid zone (16), a clean water zone (17), and a replenishment liquid zone (18). The return liquid zone (16) and the clean water zone (17), as well as the clean water zone (17) and the replenishment liquid zone (18), are separated by partitions (19). The top of the return liquid zone (16) is provided with an inlet (20), which is used to connect to the recovery pipe (14). The bottom of the clean water zone (17) is provided with a drain (21), which is used to connect to the cleaning fluid delivery pipe (13). The partition (19) between the return liquid zone (16) and the clean water zone (17) is provided with an opening (22), which contains a filter assembly (23). The replenishment zone (18) is equipped with a replenishment component that draws cleaning fluid into the clean water zone (17). The alternating injection control system is also used to control the replenishment component to draw cleaning fluid into the clean water zone (17). The return liquid zone (16) is used for the cleaning liquid recovered by the sediment recovery pipe (14). The return liquid zone (16) is equipped with a sewage discharge component for automatically discharging the sediment at the bottom of the return liquid zone (16). The sewage discharge component includes a sewage discharge pipe (25) and a suction hood (24) set at the bottom of the return liquid zone (16). The sewage discharge pipe (25) has an inverted U-shaped structure. The inner end of the sewage discharge pipe (25) is connected to the suction hood (24). The outer end of the sewage discharge pipe (25) extends through the wall of the return liquid zone (16) to the outside of the storage tank (12). The upper part of the sewage discharge pipe (25) located in the return liquid zone (16) is provided with a through hole (27). A sliding sleeve (28) is slidably connected to the sewage discharge pipe (25). A float plate (29) is provided on the sliding sleeve (28). A limiting part (30) is provided on the sewage discharge pipe (25) located above the through hole (27). When the sliding sleeve (28) abuts against the limiting part (30) after the float plate (29) floats up, the through hole (27) is located inside the sliding sleeve (28); The distance between the outer end of the drain pipe (25) and the bottom of the liquid storage tank (12) is less than the distance between the through hole (27) and the bottom of the liquid storage tank (12); The return liquid zone (16) is equipped with a detector (31) for detecting the thickness of the precipitate. The detector (31) uploads the detected precipitate thickness to the controller of the alternating injection control system. When the detected thickness reaches the preset thickness, the controller of the alternating injection control system starts the replenishment pump of the replenishment component. The replenishment pump draws cleaning fluid into the clean water zone to create a siphon effect in the discharge component. After the siphon effect is formed, the controller stops the replenishment pump or reduces the replenishment flow rate of the replenishment pump to make the siphon effect disappear. Then, the controller starts the replenishment pump of the replenishment component again to draw cleaning fluid into the clean water zone, so that the discharge component creates a siphon effect again, and the sediment is automatically discharged multiple times.

2. The intelligent oilfield injection rotation and replenishment equipment according to claim 1, characterized in that, Each metering pump (2) has a first common pipe (3) connected to its suction end. Multiple suction pipes (4) are connected to the pipe body of the first common pipe (3). Each suction pipe (4) is connected to the corresponding storage tank (1). A first control valve (5) is installed at the end of each suction pipe (4). Each metering pump (2) is connected to a three-way control valve (6) at its output end. The first output end of the three-way control valve (6) is connected to the self-cleaning system, and the second output end of the three-way control valve (6) is connected to the injection pipeline system.

3. The intelligent oilfield injection rotation and replenishment equipment according to claim 2, characterized in that, The injection pipeline system includes a second common pipe (7), and the second output ends of the three-way control valves (6) connected to the two metering pumps (2) are connected to the second common pipe (7). Multiple branch pipes (8) are connected to the common pipe, and each branch pipe (8) is equipped with a second control valve (9). Each branch pipe (8) is used to inject injection agent into an oil well.

4. The intelligent oilfield injection rotation and replenishment equipment according to claim 1, characterized in that, The alternating injection control system includes: a controller, a metering pump (2) driver, a three-way control valve (6) driver, a first control valve (5) driver, a second control valve (9) driver and a third control valve (15) driver, wherein the three-way control valve (6) driver, the first control valve (5) driver, the second control valve (9) driver and the third control valve (15) driver are all electrically connected to the controller; The driver of the three-way control valve (6) is electrically connected to the three-way control valve (6) and is used to drive the three-way control valve (6) to open or close. The first control valve (5) driver is electrically connected to the first control valve (5) and is used to drive the first control valve (5) to open or close. The second control valve (9) driver is electrically connected to the second control valve (9) and is used to drive the second control valve (9) to open or close; The third control valve (15) actuator is electrically connected to the third control valve (15) and is used to drive the third control valve (15) to open or close.

5. The intelligent oilfield injection rotation and replenishment equipment according to claim 1, characterized in that, Liquid level sensors (32) are provided in both the clear water zone (17) and the replenishment zone (18). The liquid level sensors (32) are used to detect the liquid level in the clear water zone (17) and the replenishment zone (18) and upload the detected liquid level information to the controller of the alternating injection control system.

6. The intelligent oilfield injection rotation and replenishment equipment according to claim 1, characterized in that, The liquid storage tank (12) is provided with a sludge storage tank (33) on the outside, and the outer end of the drain pipe (25) is located inside the sludge storage tank (33).

7. The intelligent oilfield injection rotation and replenishment equipment according to claim 1, characterized in that, The suction hood (24) is funnel-shaped, and the bottom of the suction hood (24) is placed on the inner bottom wall of the return liquid area (16), and the suction hood (24) has a notch (34) on its edge.

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