Pressure reducing and injection increasing device for oil field water injection well

Abstract

The utility model relates to the technical field of crude oil treatment, in particular to a depressurization and augmented injection device for a water injection well of an oil field, which comprises a first stirring device and a second stirring device, the first stirring device comprises a first tank body, a spiral feeding mechanism, a first stirring mechanism and a flushing mechanism and is used for mixing powder medicament and water; the second stirring device comprises a second tank body, a second stirring mechanism and a scraping plate assembly, and is used for mixing the liquid medicament and water and scraping residual liquid medicine through a scraping plate linked with a second rotating rod. By means of a secondary injection mode, a liquid medicament solution is injected firstly, then a powder medicament solution is injected, the problem of stratum blockage can be effectively solved through cooperation of the two medicaments, the water injection pressure is reduced, and the water injection amount is increased; the flushing mechanism can clean residual chemicals or impurities on the inner wall of the first tank body, the scraper assembly can scrape residual chemicals on the inner wall of the second tank body, waste is avoided, the problems of uneven dissolution, residue waste and the like are solved, and the pressure reducing and injection increasing effects and the working efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to crude oil processing technical field especially relates to a kind of depressurization injection devices for oilfield injection well. BACKGROUND

[0002] In the oilfield development process, especially in the late development of low-permeability reservoirs, water injection wells face the problem of rising injection pressure, and the formation plugging condition is complex, and the causes include inorganic scale accumulation, organic adhesion and clay particle migration. Single agent is difficult to cope with.

[0003] Powder agent has good stability, is easy to prepare and adjust concentration, but has limitations such as slow dissolution and uneven dispersion. Liquid agent has good solubility and dispersion, and fast reaction speed, but has poor stability and long-term effect.

[0004] With the continuous development of chemical technology, people have a deeper understanding of the synergistic effect between powder agent and liquid agent. It is found that different types of agents can be used together to exert their respective advantages and produce better depressurization and injection effect. For example, liquid acid can dissolve part of the inorganic scale to create a better environment for powder anti-swelling agent and other agents, allowing them to enter the formation pore more effectively and inhibit clay swelling. The combination of the two can improve the operation efficiency and achieve better depressurization and injection effect. Therefore, a depressurization and injection device for oilfield injection well is needed, which can use powder agent and liquid agent together.

[0005] In addition, there are still problems such as uneven dissolution of agent, waste of residual agent, and insufficient use of agent in the application of traditional single agent. INVENTION CONTENTS

[0006] The utility model aims at providing a kind of depressurization injection device for oilfield injection well, to solve the problems mentioned in the above background technology.

[0007] To achieve the above purpose, the utility model provides a kind of depressurization injection device for oilfield injection well, including first stirring device and second stirring device, the first stirring device with the second stirring device is connected by pumping pipe, the first stirring device includes first tank body, feeding mechanism and first stirring mechanism, the first stirring mechanism is arranged in the inside of the first tank body, the feeding mechanism is arranged on the outside one side of the first tank body, the inside top end of the first tank body is fixedly installed with flushing mechanism;

[0008] The second stirring device includes second tank body, second stirring mechanism and scraper assembly, the second stirring mechanism is arranged in the inside of the second tank body, and the scraper assembly is fixedly connected with the second stirring mechanism.

[0009] Preferably, a drain pipe is arranged at the center of the bottom of the first tank body, and a powder medicament feeding port and a first water inlet pipe are arranged on the top surface of the first tank body.

[0010] Preferably, the first stirring mechanism comprises a first motor and a first rotating rod, the first motor is fixedly installed on the top of the first tank body, the first rotating rod is fixedly connected with the output shaft of the first motor, and first stirring plates are uniformly arranged on the first rotating rod.

[0011] Preferably, the feeding mechanism is a spiral feeding mechanism, the discharge port of the spiral feeding mechanism is correspondingly connected with the powder medicament feeding port, and the spiral feeding mechanism is fixedly connected with the first tank body through a support frame.

[0012] Preferably, the flushing mechanism comprises a second water inlet pipe and a water spraying pipe, one end of the second water inlet pipe is connected with the water spraying pipe, the other end of the second water inlet pipe extends out of the top of the first tank body and is connected with an external water source.

[0013] The water spraying pipe is arranged in a ring shape, a plurality of water spraying heads are uniformly arranged on the water spraying pipe, each of the water spraying heads is arranged in the same direction, and a nozzle is arranged on each of the water spraying heads.

[0014] The water spraying pipe is fixedly connected with the inner side wall of the first tank body through a fixing seat.

[0015] Preferably, the second stirring mechanism comprises a second motor and a second rotating rod, the second rotating rod is fixedly connected with the output shaft of the second motor, second stirring plates are arranged on the second rotating rod, and the second motor is connected with the top of the second tank body through a motor support rod.

[0016] The scraper assembly comprises a scraper support rod and a scraper, the scraper is fixedly connected with the scraper support rod, the scraper support rod is fixedly connected with the second rotating rod, and the scraper is tightly attached to the inner wall of the second tank body.

[0017] Preferably, a liquid medicament feeding port and a third water inlet pipe are arranged on the top of the second tank body, and a solution discharge pipe is arranged at the center of the bottom of the second tank body.

[0018] Support columns are arranged at the bottoms of the first tank body and the second tank body.

[0019] Preferably, a water pump is arranged on the liquid pumping pipe.

[0020] Preferably, control valves are arranged on the first water inlet pipe and the third water inlet pipe, and a one-way valve is arranged in the solution discharge pipe.

[0021] Therefore, the pressure reducing and injection increasing device for the oilfield injection well has the following beneficial effects: the first stirring device is arranged to mix and dilute powder medicaments and water according to proportion requirements to obtain a powder medicament solution; the second stirring device is arranged to mix and dilute liquid medicaments and water according to proportion requirements to obtain a liquid medicament solution. The liquid medicament solution is injected into the injection well through the solution discharge pipe for the first injection operation. Then, the water pump is started to extract the powder medicament solution in the first tank body into the second tank body, and the powder medicament solution is injected into the injection well through the solution discharge pipe for the second injection operation.

[0022] The two medicaments cooperate to comprehensively solve the formation plugging problem caused by inorganic scale, organic matter and clay particle migration, effectively reduce the injection pressure, improve the injection volume, improve the formation seepage characteristics and improve the pressure reducing and injection increasing effect.

[0023] The flushing mechanism is composed of a water spraying pipe and a second water inlet pipe, a plurality of water spraying heads are installed on the water spraying pipe, and nozzles are arranged on the water spraying heads. By directing the water spraying heads towards the inner wall of the first tank body, the inner wall of the first tank body can be flushed, which facilitates cleaning of residual medicaments or impurities on the inner wall of the first tank body, and sewage is discharged through the sewage discharge pipe.

[0024] The scraper assembly is arranged in the second tank body, the scraper is fixedly connected to the second rotating rod through a scraper support rod, the second motor drives the second rotating rod to rotate, and then the scraper closely adheres to the inner wall of the second tank body and rotates. With the continuous rotation of the scraper, residual liquid adhering to the inner wall of the second tank body can be scraped off, thereby achieving the purpose of fully utilizing the liquid and avoiding waste. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a whole structure schematic view of the pressure reducing and injection increasing device for the oilfield injection well in the embodiment of the utility model;

[0026] Figure 2 It is a sectional view of the pressure reducing and injection increasing device for the oilfield injection well in the embodiment of the utility model;

[0027] Figure 3 It is a sectional view of the pressure reducing and injection increasing device for the oilfield injection well in the embodiment of the utility model from another perspective;

[0028] Figure 4 It is a top sectional view of the first tank body in the embodiment of the utility model;

[0029] REFERENCE NUMERALS

[0030] 1. First tank; 2. Screw feeding mechanism; 201. Support frame; 3. First stirring mechanism; 301. First motor; 302. First rotating rod; 303. First stirring plate; 4. Liquid extraction pipe; 5. Flushing mechanism; 501. Second water inlet pipe; 502. Water spray pipe; 503. Water spray head; 504. Nozzle; 505. Fixed base; 6. Second tank; 7. Second stirring mechanism; 701. Second motor; 702. Second rotating rod; 703. Second stirring plate; 704. Motor support rod; 8. Scraper assembly; 801. Scraper support rod; 802. Scraper; 9. Drain pipe; 10. Powder medicine inlet; 11. First water inlet pipe; 12. Liquid medicine inlet; 13. Third water inlet pipe; 14. Solution discharge pipe; 15. Support column; 16. Water pump. Detailed Implementation

[0031] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0032] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] Example

[0034] like Figures 1-4 As shown, this utility model discloses a pressure-reducing and injection-enhancing device for oilfield water injection wells, comprising a first stirring device and a second stirring device. The first stirring device and the second stirring device are connected by a liquid extraction pipe 4, and a water pump 16 is installed on the liquid extraction pipe 4. Activating the water pump 16 can extract liquid from the inside of the first tank 1 to the inside of the second tank 6. The first stirring device includes a first tank 1, a feeding mechanism, and a first stirring mechanism 3. The first stirring mechanism 3 is located inside the first tank 1, and the feeding mechanism is located on the outer side of the first tank 1. A flushing mechanism 5 is fixedly installed at the top of the inside of the first tank 1. The second stirring device includes a second tank 6, a second stirring mechanism 7, and a scraper assembly 8. The second stirring mechanism 7 is located inside the second tank 6, and the scraper assembly 8 is fixedly connected to the second stirring mechanism 7.

[0035] The feeding mechanism is a spiral feeding mechanism 2, the discharge port of the spiral feeding mechanism 2 is connected with the powder medicament feeding port 10, and the spiral feeding mechanism 2 is fixedly connected with the first tank body 1 through a support frame 201. In the embodiment, the powder medicament is conveyed into the first tank body 1 by the spiral feeding mechanism 2.

[0036] The first stirring mechanism 3 comprises a first motor 301 and a first rotating rod 302, the first motor 301 is fixedly installed on the top of the first tank body 1, the first rotating rod 302 is fixedly connected with the output shaft of the first motor 301, and a plurality of first stirring plates 303 are uniformly arranged on the first rotating rod 302. The first motor 301 drives the first rotating rod 302 to rotate, and then drives the first stirring plates 303 to rotate.

[0037] The flushing mechanism 5 comprises a second water inlet pipe 501 and a water spraying pipe 502, one end of the second water inlet pipe 501 is connected with the water spraying pipe 502, the other end of the second water inlet pipe 501 extends out of the top of the first tank body 1 and is connected with an external water source, the water spraying pipe 502 is arranged in a ring shape, a plurality of water spraying heads 503 are uniformly arranged on the water spraying pipe 502, each water spraying head 503 is arranged in the same direction, a nozzle 504 is arranged on each water spraying head 503, and the water spraying pipe 502 is fixedly connected with the inner side wall of the first tank body 1 through a fixing seat 505. When flushing, the external water source flows into the smaller-diameter water spraying pipe 502 through the second water inlet pipe 501, and then water columns are sprayed out of each nozzle 504 of the plurality of water spraying heads 503 to the inner wall of the first tank body 1, so that the inner wall is continuously impacted, thereby achieving the purpose of removing residual medicaments or impurities on the inner wall.

[0038] The second stirring mechanism 7 comprises a second motor 701 and a second rotating rod 702, the second rotating rod 702 is fixedly connected with the output shaft of the second motor 701, a second stirring plate 703 is arranged on the second rotating rod 702, and the second motor 701 is connected with the top of the second tank body 6 through a motor support rod 704. The scraper 802 mechanism comprises a scraper support rod 801 and the scraper 802, the scraper 802 is fixedly connected with the scraper support rod 801, the scraper support rod 801 is fixedly connected with the second rotating rod 702, and the scraper 802 closely abuts the inner wall of the second tank body 6. In the embodiment, the second motor 701 drives the second rotating rod 702 to rotate, and then drives the second stirring plate 703 to rotate, so that the inside of the second tank body 6 is stirred, and at the same time, the second rotating rod 702 also drives the scraper 802 to rotate, because the scraper 802 always closely abuts the inner wall of the second tank body 6, therefore the scraper 802 can scrape off residual liquid attached to the inner wall of the second tank body 6, thereby achieving the purpose of fully utilizing the liquid and avoiding waste.

[0039] The bottom center position of the first tank body 1 is provided with a blowdown pipe 9, the top surface of the first tank body 1 is provided with a powder medicament feeding port 10 and a first water inlet pipe 11, the top of the second tank body 6 is provided with a liquid medicament feeding port 12 and a third water inlet pipe 13, the bottom center position of the second tank body 6 is provided with a solution outlet pipe 14, and the bottom of the first tank body 1 and the second tank body 6 is provided with a supporting column 15.

[0040] The first water inlet pipe 11 and the third water inlet pipe 13 are provided with control valves, and the solution outlet pipe 14 is provided with a one-way valve.

[0041] The use method of the pressure reduction and injection increasing device for an oilfield injection well is as follows:

[0042] Powder medicament treatment: firstly, the spiral feeding mechanism 2 is started to quantitatively deliver the powder medicament to the powder medicament feeding port 10 on the top of the first tank body 1, and then to the inside of the first tank body 1, while a certain proportion of water is injected through the first water inlet pipe 11, and the first motor 301 is started to drive the first rotating rod 302 to rotate, thereby driving the first stirring plate 303 to rotate, so that the powder medicament and water in the first tank body 1 are fully stirred to form a uniform powder medicament solution.

[0043] Liquid medicament treatment: a certain amount of liquid medicament is added into the inside of the second tank body 6 through the liquid medicament feeding port 12 on the top of the second tank body 6, while a certain amount of water is injected into the inside of the second tank body 6 through the third water inlet pipe 13 according to the design proportion requirement, and then the second motor 701 is started to drive the second rotating rod 702 to rotate, thereby driving the second stirring plate 703 to rotate, so that the liquid medicament and water in the second tank body 6 are fully stirred to form a uniform liquid medicament solution, and at the same time, the second motor 701 drives the scraper 802 to rotate synchronously, the scraper 802 closely adheres to the inner wall of the second tank body 6, and the adhered liquid medicine is scraped off to reduce waste.

[0044] First injection operation: the liquid medicament solution is injected into the injection well through the solution outlet pipe 14.

[0045] Extraction of powder medicament solution: the water pump 16 is started to extract the powder medicament solution in the first tank body 1 into the second tank body 6.

[0046] Second injection operation: the powder medicament solution is injected into the injection well through the solution outlet pipe 14.

[0047] Cleaning work: the flushing mechanism 5 is started to spray high-pressure water flow to the inner wall of the first tank body 1 through the annular water spraying pipe 502 and the plurality of nozzles 504, so as to remove the residual medicament or impurities, and the sewage is discharged through the bottom blowdown pipe 9.

[0048] Therefore, the utility model discloses a kind of for the depressurization injection device of oilfield injection well using above-mentioned structure: the utility model uses liquid medicament and powder medicament, by using secondary injection mode, reach better depressurization injection effect, improve operation efficiency, and the utility model uses double-tank structure, by step processing powder medicament and liquid medicament, and combining flushing mechanism and scraper component, solve the problem such as uneven dissolution, residual waste in the application of traditional single medicament.

[0049] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model and not to limit them, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: its still can modify or equivalent replace the technical solutions of the utility model, and these modifications or equivalent replacements also cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the utility model.

Claims

1. A pressure reducing and injection enhancing device for use in an oilfield injection well, characterized by: The first stirring device and the second stirring device are connected through a liquid suction pipe, the first stirring device comprises a first tank body, a feeding mechanism and a first stirring mechanism, the first stirring mechanism is arranged inside the first tank body, the feeding mechanism is arranged on the outside of the first tank body, and a flushing mechanism is fixedly installed at the top end of the first tank body; The second stirring device comprises a second tank body, a second stirring mechanism and a scraper assembly, the second stirring mechanism is arranged inside the second tank body, and the scraper assembly is fixedly connected with the second stirring mechanism.

2. The pressure reducing and injection increasing device for an injection well of an oil field according to claim 1, characterized in that: A sewage pipe is arranged at the bottom center of the first tank body, and a powder medicament feeding port and a first water inlet pipe are arranged on the top surface of the first tank body.

3. The pressure reducing and injection increasing device for an injection well of an oil field according to claim 1, characterized in that: The first stirring mechanism comprises a first motor and a first rotating rod, the first motor is fixedly installed at the top of the first tank body, the first rotating rod is fixedly connected with the output shaft of the first motor, and first stirring plates are uniformly arranged on the first rotating rod.

4. The pressure reducing and injection enhancing device for an injection well of an oil field according to claim 2, characterized in that: The feeding mechanism is a spiral feeding mechanism, the discharge port of the spiral feeding mechanism is correspondingly connected with the powder medicament feeding port, and the spiral feeding mechanism is fixedly connected with the first tank body through a support frame.

5. The pressure reducing and injection enhancing device for an injection well of an oil field according to claim 1, characterized in that: The flushing mechanism comprises a second water inlet pipe and a water spraying pipe, one end of the second water inlet pipe is connected with the water spraying pipe, the other end of the second water inlet pipe extends out of the top of the first tank body and is connected with an external water source; The water spraying pipe is arranged in an annular shape, a plurality of water spraying heads are uniformly arranged on the water spraying pipe, each water spraying head is arranged in the same direction, and each water spraying head is provided with a nozzle; The water spraying pipe is fixedly connected with the inner side wall of the first tank body through a fixing seat.

6. The pressure reducing and injection enhancing device for an injection well of an oil field according to claim 2, characterized in that: The second stirring mechanism comprises a second motor and a second rotating rod, the second rotating rod is fixedly connected with the output shaft of the second motor, second stirring plates are arranged on the second rotating rod, and the second motor is connected with the top of the second tank body through a motor support rod; The scraper assembly comprises a scraper support rod and a scraper, the scraper is fixedly connected with the scraper support rod, the scraper support rod is fixedly connected with the second rotating rod, and the scraper is tightly attached to the inner wall of the second tank body.

7. The pressure reducing and injection enhancing device for an injection well of an oil field according to claim 6, characterized in that: A liquid medicament feeding port and a third water inlet pipe are arranged on the top of the second tank body, and a solution discharge pipe is arranged at the bottom center of the second tank body; Support columns are arranged at the bottoms of the first tank body and the second tank body.

8. The pressure reducing and injection enhancing device for an injection well of an oil field according to claim 1, characterized in that: A water pump is arranged on the liquid suction pipe.

9. The pressure reducing and injection enhancing device for an injection well of an oil field according to claim 7, characterized in that: Control valves are arranged on the first water inlet pipe and the third water inlet pipe, and a one-way valve is arranged in the solution discharge pipe.

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