Anti-sticking fishing socket

Abstract

The utility model discloses a kind of anti-jamming fishing barrels, it is related to petroleum drilling equipment technical field, including: bushing, the bottom of the bushing is threadedly connected with guide shoe, the guide shoe is wide in taper shape of narrow, the inner wall of the guide shoe is equipped with annular groove, the inner wall of the annular groove is fixedly connected with multiple evenly distributed spring telescopic rods, the spring telescopic rod, the same annular scraper is fixedly installed on the side of the spring telescopic rod away from the inner wall of the annular groove, the inner wall of the annular scraper is coated with wear-resistant coating;The annular scraper of the inner wall of guide shoe is closely attached to the surface of fish by spring telescopic rod, drilling fluid, silt, rock debris and other impurities adhered to the surface of fish can be automatically scraped in the fishing process, avoid impurities to hinder the contact of slip assembly and fish, ensure that slip can firmly bite fish, greatly reduce the risk of skidding, improve fishing success rate.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling equipment technology, and more specifically, to an anti-jamming retrieval cylinder. Background Technology

[0002] In oil and gas drilling, well workover operations, and geological exploration, complex downhole conditions (such as drill string breakage, debris jamming, and wellbore collapse) often cause tools or parts to become stuck downhole, forming "fish in the well." If these "fish" cannot be retrieved in time, it will not only affect the construction progress but may also lead to serious accidents such as wellbore abandonment.

[0003] In existing retrieval cylinders, when the fish is in operation, the surface of the fish is often covered with impurities such as drilling fluid, mud, sand, and rock cuttings. These impurities can hinder the effective contact between the slips and the fish, causing the slips to fail to firmly grip the fish or even slip, thus reducing the success rate of retrieval.

[0004] To address the above problems, an anti-jamming retrieval cylinder is proposed. Utility Model Content

[0005] To solve the above technical problems, an anti-jamming retrieval cylinder is provided.

[0006] To achieve the above objectives, the present invention can be implemented using the following technical solutions:

[0007] This utility model provides an anti-jamming retrieval cylinder, comprising: a sleeve, the bottom of which is threadedly connected to a guide shoe, the guide shoe being tapered with a wider top and a narrower bottom, the inner wall of the guide shoe having an annular groove, and a plurality of evenly distributed spring telescopic rods being fixedly connected to the inner wall of the annular groove, the spring telescopic rods having a common annular scraper fixedly installed on the side of the spring telescopic rods away from the inner wall of the annular groove, the inner wall of the annular scraper being coated with a wear-resistant coating.

[0008] Preferably, an upper connector is detachably installed on the sleeve, a slip assembly is slidably fitted on the inner wall of the sleeve, a return spring is fitted on the outer periphery of the slip assembly, a pressure sensor is installed inside the slip assembly, multiple anti-slip teeth are installed on the inner wall of the slip assembly, the inner diameter of the sleeve gradually decreases from top to bottom, and the wear-resistant coating material of the inner wall of the annular scraper is tungsten carbide.

[0009] Preferably, the upper connector, the sleeve, and the inside of the guide shoe are all provided with retrieval fluid through holes.

[0010] Preferably, guide vanes are fixedly installed on the outer periphery of the guide shoe, and the guide shoe is made of wear-resistant alloy steel.

[0011] Preferably, the top of the upper connector is threaded with a screw, the outer circumference of the screw is threaded with a nut, and a washer is fitted around the outer circumference of the screw.

[0012] As described above, the features and advantages of the anti-jamming retrieval cylinder of this utility model are:

[0013] The annular scraper on the inner wall of the guide shoe fits tightly against the surface of the fish via a spring telescopic rod. During the retrieval process, it can automatically scrape away impurities such as drilling fluid, mud, sand, and rock cuttings attached to the surface of the fish, preventing impurities from hindering the contact between the slip assembly and the fish. This ensures that the slip can firmly grip the fish, significantly reducing the risk of slippage and improving the retrieval success rate.

[0014] The pressure sensor installed inside the slip assembly can monitor the contact pressure between the slip and the fish in real time and feed the data back to the ground control system. The staff can make precise adjustments to the retrieval operation based on the pressure data to ensure that the slip always bites the fish with the best pressure, avoiding slippage due to insufficient pressure or damage to the fish and slip due to excessive pressure. At the same time, the multi-layer anti-slip teeth on the inner wall of the slip assembly adopt a special tooth shape design to increase the friction with the surface of the fish. Combined with the squeezing action of the conical sleeve on the slip assembly, it improves the locking force of the slip on the fish. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the clapper shown in this utility model;

[0017] Figure 3 This is a schematic diagram of the guide vane shown in this utility model;

[0018] Figure 4 As shown in this utility model Figure 1 Enlarged view of point A in the middle;

[0019] Figure 5 This utility model Figure 3 Enlarged diagram of point B in the middle.

[0020] The reference numerals in the accompanying drawings of this utility model are as follows: 1. Sleeve; 2. Upper connector; 3. Guide shoe; 4. Guide vane; 5. Slip assembly; 6. Pressure sensor; 7. Anti-slip teeth; 8. Return spring; 9. Screw; 10. Nut; 11. Washer; 12. Salvage fluid through hole; 13. Annular scraper; 14. Spring telescopic rod; 15. Annular groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0022] See Figures 1-5 The following is a detailed description of an embodiment of the present invention: An anti-jamming retrieval cylinder is provided.

[0023] A type of anti-jamming retrieval cylinder, such as Figures 1-5 As shown, it includes: a casing 1, with a guide shoe 3 threaded to the bottom of the casing 1. The guide shoe 3 is tapered, wider at the top and narrower at the bottom. An annular groove 15 is formed on the inner wall of the guide shoe 3. Multiple evenly distributed spring telescopic rods 14 are fixedly connected to the inner wall of the annular groove 15. The same annular scraper 13 is fixedly installed on the side of the spring telescopic rod 14 away from the inner wall of the annular groove 15. The inner wall of the annular scraper 13 is coated with a wear-resistant coating. When it is necessary to retrieve the fish, the retrieval cylinder is lowered. The annular scraper 13 on the inner wall of the guide shoe 3 fits tightly against the surface of the fish under the elastic action of the spring telescopic rod 14. As the retrieval cylinder continues to descend or the fish enters the casing 1, the annular scraper 13 will slide along the surface of the fish, scraping off the drilling fluid, mud, rock cuttings and other impurities attached to its surface, reducing the fish from getting stuck in the retrieval cylinder (the spring telescopic rod 14 is a kit composed of a spring and a telescopic tube that can produce a reset effect).

[0024] Furthermore, an upper connector 2 is detachably installed on the casing 1. A slip assembly 5 is slidably fitted on the inner wall of the casing 1. A return spring 8 is fitted on the outer periphery of the slip assembly 5. A pressure sensor 6 is installed inside the slip assembly 5. Multiple anti-slip teeth 7 are installed on the inner wall of the slip assembly 5. The inner diameter of the casing 1 gradually decreases from top to bottom. The wear-resistant coating material of the inner wall of the annular scraper 13 is tungsten carbide. The slip assembly 5 is a key tool used to fix the drill string, casing 1, or tubing in oil drilling, well workover, and other operations. It mainly consists of a slip body with a conical inner surface, serrated slip teeth that directly contact the tubing string, a slip holder that fixes and supports the slip teeth, and auxiliary operating lifting rings and safety locking devices. After being cleaned by the annular scraper 13, the fish enters the casing 1. Because the inner diameter of the casing 1 gradually decreases from top to bottom... As the fish continues its descent, it comes into contact with the slip assembly 5, pushing the slip assembly 5 upwards along the inner wall of the casing 1. During this upward sliding process, the slip assembly 5 is squeezed by the inner wall of the tapered casing 1, gradually contracting and moving towards the fish until the multi-layered anti-slip teeth 7 on the inner wall of the slip assembly 5 tightly grip the outer wall of the fish, achieving mechanical locking of the fish. At the same time, the pressure sensor 6 installed inside the slip assembly 5 monitors the contact pressure between the slip and the fish in real time and feeds the pressure data back to the ground control system. The staff can judge whether the locking is secure based on the feedback data. During the lifting process, the wear-resistant alloy steel material of the guide shoe 3 can withstand the wear and impact of the complex environment downhole, ensuring the stability of the retrieval process until the fish is lifted to the ground, completing the retrieval operation.

[0025] Furthermore, such as Figures 1-5 As shown, the upper connector 2, casing 1, and guide shoe 3 are all provided with fishing fluid through holes 12. Guide vanes 4 are fixedly installed on the outer periphery of the guide shoe 3. The guide shoe 3 is made of wear-resistant alloy steel. The top of the upper connector 2 is threaded with a screw 9, and the outer periphery of the screw 9 is threaded with a nut 10. A washer 11 is fitted on the outer periphery of the screw 9. The guide vanes 4 on the outer periphery of the guide shoe 3 further assist in guiding the direction, effectively reducing the direct friction and collision between the casing 1 and the well wall, so that the fishing cylinder can approach the fish position smoothly and steadily. The fishing fluid passes through the fishing fluid through hole 12 and enters the guide shoe 3 to initially clean and rinse the dirt on the surface of the fish, providing convenience for subsequent fishing.

[0026] Specifically, the retrieval cylinder is first securely connected to the lifting equipment via the screw 9, nut 10, and washer 11 at the top of the upper connector 2, ensuring no looseness at the connection point. The screw 9 and nut 10 improve the retrieval efficiency of the workers and meet the lifting load requirements. The lifting equipment is started, driving the retrieval cylinder to be slowly lowered along the wellbore. During this process, the retrieval fluid passes through the retrieval fluid through-hole 12 and through the guide shoe 3, initially cleaning and rinsing the dirt on the surface of the fallen fish. The guide shoe 3 has a tapered structure that is wider at the top and narrower at the bottom, and its outer diameter at its widest point is larger than the outer diameter of the casing 1, allowing it to contact the well wall first and open a channel for the entire retrieval cylinder. At the same time, the guide vanes 4 on the outer periphery of the guide shoe 3 further assist in guiding the direction, effectively reducing the direct friction and collision between the casing 1 and the well wall, allowing the retrieval cylinder to approach the fallen fish position smoothly and steadily. When the fallen fish enters the interior of the guide shoe 3, the spring telescopic rod 14 in the annular groove 15 on the inner wall of the guide shoe 3 pushes the annular scraper 13 under its own elastic force. Closely adhering to the surface of the fallen fish, as the retrieval cylinder continues to descend or the fish gradually enters casing 1, the annular scraper 13 continuously slides along the surface of the fallen fish. Because the inner wall of the annular scraper 13 is coated with a tungsten carbide wear-resistant coating, it not only ensures wear resistance during the scraping process and extends its service life, but also efficiently removes various impurities such as drilling fluid, mud, and rock cuttings adhering to the surface of the fallen fish, preventing these impurities from entering the casing 1 and affecting the subsequent operation of the slip assembly 5. After being cleaned by the annular scraper 13, the fallen fish enters the casing 1. Since the inner diameter of casing 1 gradually decreases from top to bottom, the fallen fish will contact the slip assembly 5 as it continues to descend, pushing the slip assembly 5 upwards along the inner wall of casing 1. As the slip assembly 5 slides upward, it is squeezed by the inner wall of the tapered sleeve 1, gradually contracting and moving towards the direction of the falling fish until the multi-layered anti-slip teeth 7 on the inner wall of the slip assembly 5 tightly bite the outer wall of the falling fish, achieving mechanical locking of the falling fish. At the same time, the pressure sensor 6 installed inside the slip assembly 5 monitors the contact pressure between the slip and the falling fish in real time and feeds the pressure data back to the ground control system. The staff can judge whether the locking is firm based on the feedback data. During the lifting process, the wear-resistant alloy steel material of the guide shoe 3 can withstand the wear and impact of the complex environment downhole, ensuring the stability of the retrieval process until the falling fish is lifted to the ground, completing the retrieval operation.

[0027] The above description is merely an embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An anti-jamming retrieval cylinder, characterized in that, include: A sleeve (1) is threaded to the bottom of the sleeve (1) and a guide shoe (3) is provided. The guide shoe (3) is tapered with a wider top and a narrower bottom. An annular groove (15) is provided on the inner wall of the guide shoe (3). A plurality of evenly distributed spring telescopic rods (14) are fixedly connected to the inner wall of the annular groove (15). The spring telescopic rod (14) is fixedly mounted with the same annular scraper (13) on the side away from the inner wall of the annular groove (15). The inner wall of the annular scraper (13) is coated with a wear-resistant coating.

2. The anti-jamming retrieval cylinder according to claim 1, characterized in that, The sleeve (1) is detachably fitted with an upper connector (2). The inner wall of the sleeve (1) is slidably fitted with a slip assembly (5). The outer periphery of the slip assembly (5) is fitted with a return spring (8). The slip assembly (5) is fitted with a pressure sensor (6). The inner wall of the slip assembly (5) is fitted with multiple layers of anti-slip teeth (7). The inner diameter of the sleeve (1) gradually decreases from top to bottom. The wear-resistant coating material of the inner wall of the annular scraper (13) is tungsten carbide.

3. The anti-jamming retrieval cylinder according to claim 2, characterized in that, The upper connector (2), the sleeve (1) and the guide shoe (3) are all provided with retrieval fluid through holes (12).

4. The anti-jamming retrieval cylinder according to claim 1, characterized in that, The guide shoe (3) is fixedly installed with guide blades (4) on its outer periphery. The guide shoe (3) is made of wear-resistant alloy steel.

5. The anti-jamming retrieval cylinder according to claim 2, characterized in that, The top of the upper connector (2) is threaded with a screw (9), the outer circumference of the screw (9) is threaded with a nut (10), and a washer (11) is sleeved on the outer circumference of the screw (9).

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