Friction and resistance reducing device for drill string

Abstract

The utility model belongs to the technical field of oilfield exploitation, and particularly relates to a friction and resistance reducing device for a drill string, which comprises an outer barrel and a pressurizing barrel arranged at the bottom of the outer barrel, a buffer mechanism is arranged on one side of the outer barrel, a pressurizing mechanism is arranged in the pressurizing barrel, and the buffer mechanism comprises a mounting plate, a guide rod, a fixing block, a stop block and a return spring. The pressurizing mechanism comprises a sleeve, a threaded piece, a spiral blade and a pressurizing bin. According to the friction and resistance reducing device for the drill column, through the arranged pressurizing mechanism, when drilling fluid enters the pressurizing barrel from the bottom of the inner barrel, the drilling fluid firstly passes through a spiral blade, the drilling fluid pushes the spiral blade to rotate during passing, then the effective diameter in the pressurizing barrel is periodically changed, and therefore periodically-changing pulse pressure is generated; and after the drilling fluid enters the pressurizing bin, a resonance effect can be generated at the same time, and the pulse pressure is enhanced, so that axial vibration is generated in the drill column, and the friction resistance of the drill column in the drilling process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield exploitation, in particular to a friction and resistance reducing device for a drill string. Background Art

[0002] The drill string is the general term for the steel pipe string above the drill bit and below the swivel. Its main components include downhole tools such as kelly, drill pipe, drill collars, various connectors, and stabilizers. It is a crucial tool for fast, high-quality drilling, serving as the hub connecting the surface and underground. Currently, common approaches and methods for improving drill string drilling efficiency include the following: First, by adjusting the properties of the drilling fluid to reduce drilling friction by increasing its pressure and rock-carrying efficiency. Second, by strengthening the wellbore wall stability and wellbore trajectory through cementing measures. Third, by optimizing the drill tool assembly to improve drilling efficiency. Fourth, by using various drag-reducing tools to reduce drill string friction.

[0003] Existing drag reduction tools mainly include roller-type drag reduction tools, non-rotating drag reduction joints and other devices. These devices have problems such as limited application conditions and unclear drag reduction effects when used, which may make it difficult to improve drilling efficiency and affect the progress of the entire work.

[0004] In the patent document with the publication number CN115726693A, a friction reduction and resistance reduction device for a drill string is disclosed. An impeller is arranged in the first channel. When the fluid flows through the impeller, it can drive the impeller to rotate in the first channel, thereby generating a pulse pressure in the first channel when the fluid flows through, pushing the inner cylinder to overcome the elastic force of the elastic member and perform reciprocating motion along the axial direction.

[0005] However, although the friction and drag reduction device for the drill string can pressurize the drilling oil and improve the drilling efficiency when in use, the pressurization process may cause the device to be in an unstable state, reducing the safety of the equipment. Therefore, there is a need to improve a friction and drag reduction device for the drill string. Utility Model Content

[0006] The purpose of the utility model is to provide a friction and resistance reducing device for a drill string, so as to solve the problem of friction and resistance reducing of a drill string proposed in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a friction and resistance reducing device for a drill string, comprising an outer cylinder and a booster cylinder arranged at the bottom of the outer cylinder, a buffer mechanism being arranged on one side of the outer cylinder, and a booster mechanism being arranged inside the booster cylinder;

[0008] The buffer mechanism includes a mounting plate, a guide rod, a fixed block, a stopper and a return spring. The mounting plate is arranged on the top of the outer cylinder, the guide rod is fixedly connected to the bottom of the mounting plate, the fixed block is fixedly connected to the outside of the outer cylinder, the stopper is fixedly connected to the bottom of the guide rod, and the return spring is movably connected to the top of the outer cylinder.

[0009] Preferably, a through hole cooperating with the guide rod is opened on one side of the fixed block, the outer surface of the guide rod is slidably connected to the inner wall of the through hole of the fixed block, and the block limits it, and the entire guide rod limits the maximum return amount of the return spring.

[0010] Preferably, the top of the outer cylinder and the bottom of the mounting plate are provided with mounting grooves that cooperate with the return spring. The return spring is arranged inside the mounting groove, which can limit the return spring and prevent it from sliding during operation.

[0011] Preferably, the boosting mechanism includes a sleeve, a threaded part, a spiral blade and a boosting chamber, the sleeve is rotatably connected to the top of the boosting cylinder, the threaded part is fixedly connected to the bottom of the outer cylinder, the spiral blade is rotatably connected to the inside of the boosting cylinder, and the boosting chamber is opened at the bottom of the boosting cylinder.

[0012] Preferably, the boost chamber is configured as a Helmholtz resonance chamber. After the drilling fluid enters the boost chamber, a resonance effect is generated to increase the axial vibration force of the outer cylinder and reduce the friction resistance during the drilling process of the drill string.

[0013] Preferably, the inner wall of the sleeve is provided with a thread that cooperates with the threaded part. After the sleeve is loosened, the booster cylinder can be removed from the bottom of the outer cylinder, which is convenient for staff to inspect and repair the device and is conducive to regular cleaning of the spiral blades.

[0014] Preferably, the inner wall of the outer cylinder is slidably connected to the inner cylinder. After the inner cylinder is inserted into the inner wall of the outer cylinder, the drilling oil first enters the inner wall of the inner cylinder, and then enters the inside of the booster cylinder after passing through the inner wall of the inner cylinder.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This friction and resistance reduction device for the drill string has a boosting mechanism. When the drilling fluid enters the boosting cylinder from the bottom of the inner cylinder, it first passes through the spiral blades, which push the spiral blades to rotate, thereby periodically changing the effective diameter inside the boosting cylinder, thereby generating a periodically changing pulse pressure. After the drilling fluid enters the boosting chamber, it also produces a resonance effect, which enhances this pulse pressure, causing axial vibration inside the drill string and reducing friction during the drilling process.

[0017] 2. This friction-reducing and drag-reducing device for drill strings utilizes a buffer mechanism. When drilling fluid is injected into the inner barrel, an initial impact force is generated. This force acts directly on one side of the inner barrel, then on the top of the mounting plate. This force then compresses the return spring, which then generates a rebound force that acts on the bottom of the mounting plate, offsetting the impact force. This allows the drilling fluid inside the inner barrel to reach a balanced and stable state, increasing safety during drilling fluid use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the buffer mechanism structure of the present utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the boosting mechanism of the present utility model;

[0021] Figure 4 This is a schematic diagram of the boosting bin structure of the present utility model.

[0022] In the figure: 1. Outer cylinder; 2. Booster cylinder; 3. Inner cylinder; 101. Mounting plate; 102. Guide rod; 103. Fixing block; 104. Stop block; 105. Return spring; 201. Sleeve; 202. Threaded part; 203. Spiral blade; 204. Booster chamber. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figures 1-4 , the utility model provides a technical solution:

[0025] Example 1:

[0026] A friction and resistance reducing device for a drill string comprises an outer cylinder 1 and a booster cylinder 2 arranged at the bottom of the outer cylinder 1, wherein a buffer mechanism is arranged on one side of the outer cylinder 1;

[0027] The buffer mechanism includes a mounting plate 101, a guide rod 102, a fixing block 103, a stopper 104, and a return spring 105. The mounting plate 101 is mounted on the top of the outer cylinder 1. The guide rod 102 is fixedly connected to the bottom of the mounting plate 101. The fixing block 103 is fixedly connected to the exterior of the outer cylinder 1. A through hole is formed on one side of the fixing block 103 to mate with the guide rod 102. The outer surface of the guide rod 102 is slidably connected to the inner wall of the through hole in the fixing block 103, while the stopper 104 limits the position of the guide rod 102. The stopper 104 is fixedly connected to the bottom of the guide rod 102. The return spring 105 is movably connected to the top of the outer cylinder 1. Mounting slots for the return spring 105 are formed on the top of the outer cylinder 1 and the bottom of the mounting plate 101. The return spring 105 is disposed within the mounting slot to limit the return spring 105 and prevent it from sliding during operation. When drilling fluid is injected into the inner tube 3, an impact force is generated. This impact force acts directly on one side of the inner tube 3 and then on the top of the mounting plate 101. This compresses the return spring 105. After the return spring 105 is compressed, its own restoring force generates a rebound force that acts on the bottom of the mounting plate 101, offsetting the impact force. This allows the drilling fluid inside the inner tube 3 to reach a balanced and stable state, increasing the safety of the drilling fluid during use.

[0028] Example 2:

[0029] On the basis of Example 1, a boosting mechanism is provided inside the boosting cylinder 2. The boosting mechanism includes a sleeve 201, a threaded member 202, a spiral blade 203, and a boosting chamber 204. The sleeve 201 is rotatably connected to the top of the boosting cylinder 2, and the threaded member 202 is fixedly connected to the bottom of the outer cylinder 1. The inner wall of the sleeve 201 is provided with a thread that cooperates with the threaded member 202. After the sleeve 201 is loosened, the boosting cylinder 2 can be removed from the bottom of the outer cylinder 1, which is convenient for staff to inspect and repair the device and is conducive to regular cleaning of the spiral blade 203. The spiral blade 203 is rotatably connected to the inside of the boosting cylinder 2, and the boosting chamber 204 is opened at the bottom of the boosting cylinder 2. The boosting chamber 204 is configured as a Helmholtz resonance cavity. After the drilling fluid enters the boosting chamber 204, a resonance effect is generated to increase the axial vibration force of the outer cylinder 1, thereby reducing the friction resistance during the drilling process of the drill string. When the drilling fluid enters the booster cylinder 2 from the bottom of the inner cylinder 3, it will first pass through the spiral blade 203, pushing the spiral blade 203 to rotate, and then periodically changing the effective diameter inside the booster cylinder 2, thereby generating a periodically changing pulse pressure. After the drilling fluid enters the booster chamber 204, it will also produce a resonance effect, enhancing this pulse pressure, causing axial vibration inside the drill string, and reducing the friction resistance of the drill string during drilling.

[0030] The inner wall of the outer cylinder 1 is slidably connected to the inner cylinder 3. After the inner cylinder 3 is inserted into the inner wall of the outer cylinder 1, the drilling oil first enters the inner wall of the inner cylinder 3, and then enters the inside of the booster cylinder 2 after passing through the inner wall of the inner cylinder 3.

[0031] Working principle:

[0032] First, after the inner cylinder 3 is inserted into the inner wall of the outer cylinder 1, the buffer mechanism is provided. When the drilling fluid is injected into the inner cylinder 3, an impact force is initially generated. The impact force acts directly on one side of the inner cylinder 3 and then on the top of the mounting plate 101. Subsequently, the return spring 105 is compressed. After the return spring 105 is compressed, its own restoring force generates a rebound force, which acts on the bottom of the mounting plate 101 and offsets the impact force. This allows the drilling fluid inside the inner cylinder 3 to reach a balanced and stable state, increasing the safety of the drilling fluid during use.

[0033] Furthermore, through the provided boosting mechanism, when the drilling fluid enters the boosting cylinder 2 from the bottom of the inner cylinder 3, it will first pass through the spiral blade 203, pushing the spiral blade 203 to rotate, and then periodically changing the effective diameter inside the boosting cylinder 2, thereby generating a periodically changing pulse pressure. After the drilling fluid enters the boosting chamber 204, a resonance effect will also be generated, thereby enhancing this pulse pressure, causing axial vibration inside the drill string, and reducing the friction resistance of the drill string during drilling.

[0034] Furthermore, the rotating sleeve 201 can remove the booster cylinder 2 from the bottom of the outer cylinder 1, and the spiral blades 203 can be cleaned and repaired, making it convenient for staff to inspect and repair the device.

[0035] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

Claims

1. A friction and resistance reducing device for a drill string, comprising an outer cylinder (1) and a booster cylinder (2) arranged at the bottom of the outer cylinder (1), characterized in that: A buffer mechanism is provided on one side of the outer cylinder (1), and a boost mechanism is provided inside the boost cylinder (2); The buffer mechanism comprises a mounting plate (101), a guide rod (102), a fixing block (103), a stopper (104) and a return spring (105); the mounting plate (101) is arranged on the top of the outer cylinder (1); the guide rod (102) is fixedly connected to the bottom of the mounting plate (101); the fixing block (103) is fixedly connected to the outside of the outer cylinder (1); the stopper (104) is fixedly connected to the bottom of the guide rod (102); and the return spring (105) is movably connected to the top of the outer cylinder (1).

2. The friction and resistance reducing device for a drill string according to claim 1, characterized in that: A through hole is provided on one side of the fixing block (103) and is matched with the guide rod (102).

3. The friction and resistance reducing device for a drill string according to claim 1, characterized in that: The top of the outer cylinder (1) and the bottom of the mounting plate (101) are provided with mounting grooves that cooperate with the return spring (105).

4. The friction and resistance reducing device for a drill string according to claim 1, characterized in that: The boosting mechanism comprises a sleeve (201), a threaded member (202), a spiral blade (203) and a boosting chamber (204); the sleeve (201) is rotatably connected to the top of the boosting cylinder (2); the threaded member (202) is fixedly connected to the bottom of the outer cylinder (1); the spiral blade (203) is rotatably connected to the inside of the boosting cylinder (2); and the boosting chamber (204) is opened at the bottom of the boosting cylinder (2).

5. The friction reducing and drag reducing device for a drill string according to claim 4, characterized in that: The pressurizing chamber (204) is configured as a Helmholtz resonance cavity.

6. The friction and resistance reducing device for a drill string according to claim 4, characterized in that: The inner wall of the sleeve (201) is provided with a thread that matches the threaded member (202).

7. The friction and resistance reducing device for a drill string according to claim 1, characterized in that: The inner wall of the outer cylinder (1) is slidably connected to the inner cylinder (3).

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