A water injection well through tool for oil field development with trash collection

Abstract

The utility model discloses an oilfield exploitation injection well through well device that can collect sundries, relates to oilfield exploitation field, through well device main part is including, and the upper joint is installed to the through well device main part top end thread, the through well device main part outer wall is equipped with the cleaning structure for cleaning the sundries of injection well casing inner wall, the cleaning structure includes the scraping blade and elastic cleaning brush who sets alternately along the axis direction of through well device main part outer wall, the through well device main part bottom is equipped with the sundry collection structure for collecting the sundry after cleaning. This oilfield exploitation injection well through well device that can collect sundries, through setting up sundry collection structure at the through well device main part bottom, can collect the scale, adhesion and the sundry such as downhole original fragmentary rubber, iron filings that scrape off directly, avoid the sundry after cleaning remaining in the wellbore and cause secondary blockage, improve the cleanness of injection well significantly, guarantee the smooth down of testing instrument and the unobstructed of injection channel.

Description

Technical Field

[0001] This utility model relates to the field of oilfield development technology, specifically to a well cleaning device for oilfield development water injection wells that can collect debris. Background Technology

[0002] During the water injection development process in oilfields, scale and adhering substances are easily formed on the inner wall of the injection well casing. At the same time, downhole operations may leave behind debris such as broken rubber, iron filings, and scale flakes. These impurities can cause the pipe diameter to shrink, block the channel, affect the insertion of testing instruments and water injection efficiency, and even cause stuck drill accidents, increasing well repair costs. Cleaning with a well cleaning tool is usually required.

[0003] In the prior art, Chinese Patent No. CN211648088U discloses a well-clearing tool, which includes: a tremor rod, a tremor cylinder, and a well-clearing rod. One end of the tremor rod is located inside the tremor cylinder and connected to the tremor cylinder by a first pin, while the other end extends out of the tremor cylinder and is connected to the well-clearing rod. The well-clearing rod has multiple annular grooves. One end of the tremor cylinder is connected to a steel wire rope. This well-clearing tool can not only achieve tremor-based unblocking but also effectively avoid well-clearing accidents caused by solid hard impurities such as sand, scale, iron filings, and welding slag, ensuring testing efficiency, saving well-clearing time, and reducing labor intensity.

[0004] Based on the above information, existing well cleaning tools do not have an effective debris collection structure when cleaning the inner wall of the injection well casing. As a result, the dirt and debris that are removed during cleaning and the original debris in the well remain in the wellbore, which can easily cause secondary blockage. Therefore, we propose a well cleaning tool for oilfield development that can collect debris. Utility Model Content

[0005] The purpose of this utility model is to provide a well cleaning tool for oilfield development water injection wells that can collect debris, in order to solve the problem mentioned in the background art that the existing well cleaning tools do not have an effective debris collection structure when cleaning the inner wall of the water injection well casing, resulting in the dirt and debris that are removed during cleaning and the original debris in the well remaining in the well barrel, which can easily cause secondary blockage.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a well cleaning tool for oilfield development using water injection wells that can collect debris, comprising a well cleaning tool body, wherein an upper connector is threadedly installed at the top of the well cleaning tool body; The outer wall of the well cleaning tool body is provided with a cleaning structure for cleaning debris from the inner wall of the injection well casing. The cleaning structure includes scraping blades and elastic cleaning brushes alternately arranged along the axial direction of the outer wall of the well cleaning tool body. The bottom end of the well cleaning tool body is provided with a debris collection structure for collecting the cleaned debris.

[0007] Furthermore, the main body of the well-clearing tool is designed in a spindle shape with a diameter in the middle larger than that at both ends, and a guide head is provided at the bottom of the main body of the well-clearing tool. The upper connector, the main body of the well-clearing tool, and the guide head are coaxially fixedly connected in sequence.

[0008] Furthermore, the scraping blades are evenly distributed in a ring around the axis of the main body of the well, and the spiral directions of adjacent sets of alternating scraping blades are opposite. The maximum outer diameter of the scraping blades is smaller than the inner diameter of the injection well casing, and the cutting edge of the scraping blades is designed with bidirectional inclination.

[0009] Furthermore, the elastic cleaning brush is made of wear-resistant nylon material, and the bristle length of the elastic cleaning brush is greater than the distance between the end of the scraping blade and the outer wall of the well body.

[0010] Furthermore, the debris collection structure includes a debris collection cylinder threaded between the well cleaning tool body and the guide head, and the inner wall of the debris collection cylinder is provided with a guide cone, and the bottom of the guide cone is provided with a filter screen.

[0011] Furthermore, the outer diameter of the debris collection cylinder is the same as the outer diameter of the well cleaning device body, and the top of the debris collection cylinder is provided with a through hole for well fluid and debris to enter, and the through holes are distributed at equal angles. The outer wall of the debris collection cylinder is uniformly provided with filter holes.

[0012] Furthermore, the guide cone is located between the through hole and the filter screen, with the large-diameter end of the guide cone facing the through well body and the small-diameter end of the guide cone facing the filter screen.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This well-cleaning tool for oilfield water injection wells, capable of collecting debris, utilizes a debris collection structure at the bottom of the tool's main body. Through the combined action of the debris collection cylinder's through-hole introduction, the guide cone, and the filter screen, it can directly collect scraped-off scale, adhesives, and existing debris such as scraped rubber and iron filings from the wellbore. This prevents secondary blockages caused by debris remaining in the wellbore after cleaning, significantly improving the cleanliness of the water injection well and ensuring smooth insertion of testing instruments and unobstructed water injection channels. Furthermore, the debris collection cylinder is threadedly connected to the well-cleaning tool's main body and guide head, allowing for convenient disassembly and cleaning, making it highly practical and easy to operate.

[0014] 2. The cleaning structure, which alternates between scraping blades and elastic cleaning brushes along the main axis of the well cleaning tool, features a ring-shaped, evenly distributed scraping blade with a bidirectional inclined edge and a reverse spiral layout. This allows for efficient scraping of stubborn dirt from the inner wall of the casing from different angles. Meanwhile, the elastic cleaning brush, made of wear-resistant nylon, has longer bristles and can closely conform to the inner wall of the casing to perform a secondary cleaning of residual impurities after scraping. This achieves dual cleaning through scraping and sweeping, resulting in a more thorough cleaning than a single-structure well cleaning tool. At the same time, the maximum outer diameter of the scraping blade is smaller than the inner diameter of the casing, and the elastic cleaning brush has elastic deformation capabilities, ensuring both cleaning effectiveness and avoiding damage to the inner wall of the casing.

[0015] 3. The main body of the well cleaning tool adopts a spindle-shaped design with a larger diameter in the middle than at both ends. Combined with the guide head at the bottom, this reduces resistance and enhances guidance when the well cleaning tool moves inside the wellbore, effectively reducing the risk of getting stuck. Furthermore, the overall structure is coaxially fixed, ensuring high operational stability. The alternating layout of the scraping blade and the elastic cleaning brush can distribute the cleaning pressure, reduce wear on individual components, extend the service life of the well cleaning tool, and reduce the cost of well workover operations in the oilfield. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cleaning structure of this utility model; Figure 3 This is a schematic diagram of the internal structure of the debris collection tube of this utility model; Figure 4 This is a schematic diagram of the debris collection tube and guide head structure of this utility model; Figure 5 This is a schematic diagram of the debris collection structure of this utility model; Figure 6 This is a schematic cross-sectional view of the debris collection cylinder of this utility model.

[0017] In the diagram: 1. Well cleaning tool body; 2. Upper connector; 3. Debris collection cylinder; 301. Through hole; 302. Filter hole; 4. Guide head; 5. Scraper blade; 6. Flexible cleaning brush; 7. Guide cone; 8. Filter screen. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1: Please refer to Figures 1-3 The present invention provides the following technical solution: a well cleaning tool for oilfield development water injection wells that can collect debris, including a well cleaning tool body 1, with an upper connector 2 threadedly installed at the top of the well cleaning tool body 1; the outer wall of the well cleaning tool body 1 is provided with a cleaning structure for cleaning debris from the inner wall of the water injection well casing, the cleaning structure including scraping blades 5 and elastic cleaning brushes 6 alternately arranged along the axial direction of the outer wall of the well cleaning tool body 1.

[0020] like Figures 1-3As shown, the main body 1 of the well cleaning tool has a spindle-shaped design with a diameter in the middle larger than that at both ends, and a guide head 4 is provided at the bottom of the main body 1. The upper connector 2, the main body 1 of the well cleaning tool and the guide head 4 are coaxially fixedly connected in sequence.

[0021] like Figure 1 and Figure 2 As shown, the scraping blades 5 are evenly distributed in a ring around the axis of the well body, and the spiral directions of two adjacent sets of alternating scraping blades 5 are opposite. The maximum outer diameter of the scraping blades 5 is smaller than the inner diameter of the water injection well casing, and the cutting edge of the scraping blades 5 is designed with bidirectional inclination. The elastic cleaning brush 6 is made of wear-resistant nylon material, and the bristle length of the elastic cleaning brush 6 is greater than the distance between the end of the scraping blades 5 and the outer wall of the well body.

[0022] When the well cleaning tool is connected to the downhole operating equipment via the upper connector 2 and moves along the casing axis of the water injection well, the cleaning structure starts operating simultaneously. The annularly distributed scraping blades 5 rotate or move axially with the body 1 of the well cleaning tool. The bidirectionally inclined blades can cut into the scale and adhering substances on the inner wall of the casing from multiple angles. The reverse spiral layout of two adjacent sets of scraping blades 5 can generate reverse cutting force during the movement, improving the efficiency of removing stubborn dirt. After the scraping operation, the elastic cleaning brushes 6, which are alternately arranged along the axis, follow up. The wear-resistant nylon bristles are longer than the distance between the end of the scraping blade 5 and the outer wall of the body 1 of the well cleaning tool. They can fit tightly against the inner wall of the casing and perform secondary cleaning of the small impurities remaining after scraping through elastic deformation. This achieves continuous and coordinated operation of scraping and cleaning, ensuring the cleanliness of the inner wall of the casing.

[0023] Example 2: Please refer to Figures 1-6 Based on Embodiment 1, a debris collection structure is also disclosed, the specific structure of which is as follows: The bottom end of the well cleaning tool body 1 is provided with a debris collection structure for collecting the cleaned debris. The debris collection structure includes a debris collection cylinder 3 threaded between the well cleaning tool body 1 and the guide head 4, and the inner wall of the debris collection cylinder 3 is provided with a guide cone 7, and the bottom of the guide cone 7 is provided with a filter screen 8; the outer diameter of the debris collection cylinder is the same as the outer diameter of the well cleaning tool body 1, and the top of the debris collection cylinder 3 is provided with a through hole 301 for well fluid and debris to enter, and the through holes 301 are distributed at equal angles. The outer wall of the debris collection cylinder is uniformly provided with filter holes 302; the guide cone 7 is located between the through hole 301 and the filter screen 8, and the large diameter end of the guide cone 7 faces the well cleaning body, and the small diameter end of the guide cone 7 faces the filter screen 8.

[0024] The debris detached from the structure and the original debris such as broken rubber and iron filings in the well are cleaned up. Under the dual action of well fluid flow and well cleaning tool movement, they enter the collection chamber through the through holes 301 distributed at equal angles at the top of the debris collection cylinder 3. The well fluid and debris entering the collection chamber converge to the bottom under the guidance of the guide cone 7. The design of the guide cone 7, with the large diameter facing the well cleaning tool body 1 and the small diameter facing the filter screen 8, can accelerate the sedimentation of impurities and prevent debris from accumulating and clogging in the collection chamber. The filter screen 8 intercepts and filters the converged debris, allowing the well fluid to flow back to the well barrel through the filter holes 302 on the outer wall of the debris collection cylinder 3, thus separating the debris from the well fluid. Throughout the collection process, the outer diameter of the debris collection cylinder 3 is consistent with that of the well cleaning tool body 1, ensuring that the movement resistance of the well cleaning tool is not affected. Moreover, the collection cylinder is installed between the well cleaning tool body 1 and the guide head 4 by threads, and can be easily disassembled after the operation is completed, so as to centrally clean the collected debris and avoid secondary blockage caused by debris residue.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A well cleaner for oilfield development using water injection wells that can collect debris, comprising a well cleaner body (1), wherein an upper connector (2) is threaded onto the top of the well cleaner body (1). Its features are: The outer wall of the well cleaning device body (1) is provided with a cleaning structure for cleaning debris from the inner wall of the injection well casing. The cleaning structure includes scraping blades (5) and elastic cleaning brushes (6) alternately arranged along the axial direction of the outer wall of the well cleaning device body (1). The bottom end of the well cleaning device body (1) is provided with a debris collection structure for collecting the cleaned debris.

2. The well-cleaning device for oilfield development using water injection wells, as described in claim 1, is characterized in that: The main body (1) of the well cleaning tool is designed in a spindle shape with a diameter in the middle larger than that at both ends. The bottom end of the main body (1) of the well cleaning tool is provided with a guide head (4). The upper connector (2), the main body (1) of the well cleaning tool and the guide head (4) are coaxially fixedly connected in sequence.

3. A well-cleaning device for oilfield development using water injection wells, as described in claim 1, characterized in that: The scraping blades (5) are evenly distributed in a ring around the axis of the main body of the well, and the spiral directions of the two adjacent sets of alternating scraping blades (5) are opposite. The maximum outer diameter of the scraping blades (5) is smaller than the inner diameter of the water injection well casing. The cutting edge of the scraping blades (5) is designed with bidirectional inclination.

4. A well-cleaning device for oilfield development using water injection wells, as described in claim 1, characterized in that: The elastic cleaning brush (6) is made of wear-resistant nylon material, and the bristle length of the elastic cleaning brush (6) is greater than the distance between the end of the scraping blade (5) and the outer wall of the well body.

5. A well-cleaning device for oilfield development using water injection wells, as described in claim 1, characterized in that: The debris collection structure includes a debris collection cylinder (3) threaded between the well cleaning device body (1) and the guide head (4), and the inner wall of the debris collection cylinder (3) is provided with a guide cone (7), and the bottom of the guide cone (7) is provided with a filter screen (8).

6. A well-cleaning device for oilfield development using water injection wells, as described in claim 5, characterized in that: The outer diameter of the debris collection cylinder is the same as that of the well cleaning device body (1), and the top of the debris collection cylinder (3) is provided with a through hole (301) for well fluid and debris to enter, and the through holes (301) are distributed at equal angles. The outer wall of the debris collection cylinder is uniformly provided with filter holes (302).

7. A well-cleaning device for oilfield development using water injection wells, as described in claim 5, characterized in that: The guide cone (7) is located between the through hole (301) and the filter screen (8), with the large diameter end of the guide cone (7) facing the through well body and the small diameter end of the guide cone (7) facing the filter screen (8).

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