Controllable sand cleaning drill pipe

Abstract

The utility model discloses a controllable sand cleaning drill rod, include: upper joint, its upper end is female buckle, is connected with the male buckle of upper drill rod for, drill rod body is connected in the below of upper joint, lower joint is connected in the below of drill rod body, and lower end is male buckle, is connected with the female buckle of lower drill rod for, spiral convex, arrange in the outer periphery of drill rod body, water jet mechanism, including drill rod side wall water eye and nozzle, the inner port of drill rod side wall water eye is communicated with drill rod center hole, and the outer end of drill rod side wall water eye is in the spiral recessed groove face export of spiral convex, and installs the nozzle in the outer port, control mechanism is used for controlling the opening and closing of water jet mechanism. The side wall of crescent cylinder cover seals the inner port of drill rod side wall water eye. This sand cleaning drill rod can realize controllable, adjustable sand cleaning of big displacement horizontal well, and simple structure, reliable function.

Description

Technical Field

[0001] This utility model relates to a drill pipe for oil drilling, and more particularly to a controllable sand-removing drill pipe, belonging to the field of oil drilling tool technology. Background Technology

[0002] With the deepening development of unconventional oil and gas, the application of extended reach well technology is becoming increasingly widespread. To achieve efficient development of unconventional oil and gas, the depth and horizontal section length of extended reach wells are constantly increasing. During drilling, cuttings beds are easily formed due to factors such as well inclination angle, cuttings particle size, and annular hydraulic parameters. The presence of cuttings beds easily attracts the drill string, leading to excessive frictional torque during drilling, causing difficulties in pressure transmission and even sticking, seriously affecting drilling efficiency and downhole safety. Although increasing hydraulic displacement and enhancing hydraulic proppant carrying can reduce cuttings beds and improve wellbore cleanliness to some extent, the limitations of surface pumps and turbines make it difficult to excessively enhance hydraulic parameters as well depth increases. Therefore, cuttings bed removal tools combined with hydraulic proppant carrying have gradually developed in drilling practice.

[0003] Chinese patent application CN 118728282A discloses a "mechanical-hydraulic combined sand-cleaning drill pipe." This drill pipe combines mechanical and hydraulic sand-cleaning methods. During drilling, the drill pipe's rotation generates a vortex effect around the wellbore axis, mechanically disturbing the cuttings bed while simultaneously driving the flowing drilling fluid to form a spiral fluid around the axis. At the same time, nozzles on the pipe eject the drilling fluid at high speed, accelerating the stripping of cuttings from the cuttings bed and into the annular fluid. The flow of the drilling fluid enhances the transport capacity of the cuttings and improves wellbore cleanliness. However, this technology cannot control the activation and deactivation of the sand-cleaning function. Whenever the pump is turned on, the nozzles eject high-speed drilling fluid, accelerating the collapse of easily collapsible sections, and the sand-cleaning intensity cannot be adjusted.

[0004] Chinese patent CN 115628021B discloses a "downhole sand removal tool while drilling." When drilling fluid flows through the annulus between the central tube and inner tube of the rubber sleeve, it is divided into two parts: one part flushes the bottom of the borehole, and the other part pushes a piston. The piston shears a shear pin and pushes a spring. When the shear pin is not sheared, the drilling fluid carries cuttings upwards along the annulus formed with the borehole wall, forming a positive circulation. When the shear pin is sheared, the channel from the drilling fluid to the expanding rubber sleeve is opened. The expanding rubber sleeve expands upon contact with water, blocking the annulus with the borehole wall and forming a reverse circulation. When the drilling fluid pressure decreases, the spring pushes the piston to close the channel from the drilling fluid to the expanding rubber sleeve, thus forming a positive circulation again. This tool provides a downhole sand removal tool while drilling, which can achieve a near-bit reverse circulation process by adjusting the drilling fluid pressure, thus removing sand from the bottom of the borehole while drilling. However, this tool has a complex structure and is prone to malfunctions downhole, affecting construction efficiency.

[0005] Chinese patent CN 221761858U discloses a "downhole sand cleaning tool and drill string assembly," in which the downhole sand cleaning tool includes a base and multiple water-hole bodies. The base includes a base wall, a through hole formed by the base wall, and multiple water-holes disposed on the base wall and communicating with the through hole. The multiple water-holes are evenly distributed along the axial direction of the base, and their projections on the end face of the base are evenly distributed circumferentially. The multiple water-holes have different angles with the base axis at different positions on the base wall. One end of the base is used to connect to the drill pipe, and the other end is used to connect to the drill bit. The multiple water-hole bodies are all hollow structures, and each water-hole body is correspondingly disposed within a multiple water-hole. Because of the water-holes at different positions and angles, drilling fluid can be ejected from different directions and positions, which is beneficial for cleaning excessive sand in the downhole, ensuring smooth drilling and wellbore quality. However, this technical solution also has the problem of not being able to control the activation and deactivation of the sand cleaning function.

[0006] Chinese patent application CN 113027362A discloses a "drilling sand-cleaning converter," comprising a body with an axially oriented channel inside. The body has internal and external threads for screwing into drill pipes at both ends. The middle section is a working section with multiple V-grooves axially oriented. High-wear-resistant alloy blocks are embedded in the surfaces of the convex ridges forming the V-grooves. This allows for efficient wellbore dressing during drilling, saving construction costs and improving efficiency. However, this device is only suitable for normal vertical and inclined wells. For horizontal wells with large reach, the working section of this device can actually complicate downhole operations.

[0007] Therefore, there is an urgent need to develop a new type of sand-cleaning drill pipe to achieve controllable and adjustable sand cleaning in horizontal wells with large displacement, and with a simple structure and reliable function. Utility Model Content

[0008] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0009] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0010] The purpose of this invention is to overcome the problems existing in the prior art, such as the inability to control the opening and closing of the sand cleaning function, the inability to adjust the sand cleaning intensity, and the complexity and susceptibility to failure. It provides a controllable sand cleaning drill pipe that can achieve controllable and adjustable sand cleaning in horizontal wells with large displacement, and has a simple structure and reliable function.

[0011] To solve the above technical problems, this utility model provides a controllable sand-cleaning drill rod, comprising:

[0012] The upper connector has a female thread at its top, which is used to connect with the male thread of the drill pipe above.

[0013] The drill pipe body is connected to the lower part of the upper connector;

[0014] The lower connector is located below the drill pipe body, and its lower end is a male thread, used to connect with the female thread of the drill pipe below.

[0015] Spiral protrusions are arranged on the outer periphery of the drill pipe body.

[0016] The water spraying mechanism includes a water eye on the side wall of the drill rod and a nozzle. The inner port of the water eye on the side wall of the drill rod is connected to the central channel of the drill rod, and the outer end of the water eye on the side wall of the drill rod is at the outlet of the spiral groove surface of the spiral protrusion, and the nozzle is installed in the outer port.

[0017] The control mechanism is used to control the opening and closing of the water spray system.

[0018] As an improvement of this utility model, the nozzle is a detachable structure, and the nozzle orifice extends outward along the tangential direction of the drill rod body.

[0019] As a further improvement of this utility model, the control mechanism includes a spring, a crescent-shaped groove and a crescent-shaped cylinder sleeve. The crescent-shaped groove is fixedly connected to the inner wall of the drill rod body. The spring is placed in the crescent-shaped groove and its lower end is supported at the bottom of the crescent-shaped groove. The upper end of the crescent-shaped cylinder sleeve is open, and the lower end is closed and pressed on top of the spring.

[0020] As a further improvement of this utility model, the side wall of the crescent-shaped cylinder liner is fitted with the crescent-shaped groove and the inner wall of the drill rod body with a clearance.

[0021] As a further improvement of this utility model, when the wellhead pump pressure is lower than the set value, the side wall of the crescent-shaped cylinder liner blocks the inner port of the water hole on the side wall of the drill pipe.

[0022] As a further improvement of this utility model, the upper end of the crescent-shaped groove is provided with a bent portion, and one side of the upper end of the crescent-shaped cylinder liner is restricted below the bent portion at the upper end of the crescent-shaped groove.

[0023] As a further improvement of this utility model, the other side of the upper end of the crescent-shaped cylinder liner is restricted to the lower part of the upper drill rod.

[0024] As a further improvement of this utility model, when the wellhead pump pressure exceeds the set value, the crescent-shaped cylinder liner compression spring moves downward to open the inner port of the water hole on the drill pipe side wall.

[0025] As a further improvement of this utility model, the spring is a detachable structure, and springs and nozzles of corresponding specifications can be replaced according to different vertical depths of the horizontal section of the wellbore.

[0026] As a further improvement of this utility model, the crescent-shaped cylinder liner is a high-strength wear-resistant cylinder liner.

[0027] Compared with the prior art, the advantages or beneficial effects of the embodiments of this application include at least the following: 1. Because there is a spiral protrusion on one side of the body of the drill pipe, when the drill string rotates, the spiral protrusion pushes the cuttings bed at the bottom edge of the wellbore tangentially on the one hand, and on the other hand, the spiral protrusion can keep the water spraying mechanism from being blocked by the well wall and affecting normal operation.

[0028] 2. The control mechanism of this drill pipe can realize the opening and closing of the sand cleaning function of the controllable sand cleaning drill pipe, so as to achieve the function of both cleaning sand and protecting the easily collapsible well section. At the same time, the sand cleaning intensity can be adjusted according to different sand accumulation conditions.

[0029] 3. The nozzles of the water spraying mechanism in this drill pipe are set at a certain angle to the drill pipe body. On the one hand, this prevents the high-speed drilling fluid sprayed by the water spraying mechanism from directly spraying into the well wall, which would cause wellbore instability. On the other hand, the high-speed drilling fluid sprayed out tangentially washes the cuttings bed.

[0030] 4. By replacing components such as the spring and nozzle of this drill pipe, it can be used to handle wells of different vertical depths, achieving multiple uses with one pipe; it has a simple structure, is easy to process and manufacture, is convenient for field application, and has high safety and reliability. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0032] Figure 1 This is a schematic diagram of the structure of the controllable sand-cleaning drill rod of this utility model;

[0033] Figure 2 for Figure 1 Sectional view along the middle AA;

[0034] Figure 3 for Figure 1 In the sectional view along BB;

[0035] Figure 4 This is a diagram showing the state of the present invention during the flushing and sand removal process;

[0036] In the figure: 1. Drill pipe body; 2. Upper connector; 3. Lower connector; 4. Spiral protrusion; 5. Water spray mechanism; 6. Crescent-shaped cylinder liner; 7. Water hole on the side wall of the drill pipe; 8. Nozzle; 9. Spring; 10. Crescent-shaped groove; 11. Control mechanism; 12. Concave surface. Detailed Implementation

[0037] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0038] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0040] like Figures 1 to 3 As shown, the controllable sand-cleaning drill rod of this utility model includes an upper connector 1, a drill rod body 2, a lower connector 3, a spiral protrusion 4, a spiral groove surface 12, a water spraying mechanism 5, and a control mechanism 11.

[0041] The upper end of the upper connector 1 is a female thread, used to connect with the male thread of other controllable sand-cleaning drill pipes or with the male thread of ordinary drill pipes; the lower end of the lower connector 3 is a male thread, used to connect with the female thread of other controllable sand-cleaning drill pipes or with the female thread of ordinary drill pipes.

[0042] The spiral protrusion 4 is arranged on the outer periphery of the drill pipe body 2. In horizontal well sections where cuttings beds are easily formed, the drill string is subjected to gravity and adheres to the lower well wall. The spiral protrusion 4 can prevent the water jetting mechanism 5 from being blocked by the well wall. When the drill string rotates, the spiral protrusion 4 can tangentially push the cuttings bed at the lower edge of the wellbore, causing the cuttings to be separated from the cuttings bed and enter the annular fluid.

[0043] The water spraying mechanism 5 includes a water inlet 7 on the drill pipe sidewall and a nozzle 8. The inner port of the water inlet 7 communicates with the central channel of the drill pipe, and the outer port of the water inlet 7 is located on the spiral groove surface 12. The nozzle 8 is installed on the outer port of the water inlet 7 and is detachable. The nozzle 8 is set at a certain angle to the drill pipe body 2. When the controllable sand-cleaning drill pipe is working, on the one hand, it prevents the high-speed drilling fluid sprayed from the nozzle 8 from directly spraying into the well wall and causing wellbore collapse; on the other hand, the high-speed drilling fluid sprayed tangentially washes the cuttings bed, which is more conducive to the stripping of cuttings from the cuttings bed and their entry into the annular fluid.

[0044] The control structure 11 includes a spring 9, a crescent-shaped groove 10, and a crescent-shaped cylinder liner 6. The spring 9 is a detachable structure and is placed in the crescent-shaped groove 10, which is fixedly connected to the inner cavity of the drill pipe body 2. The crescent-shaped cylinder liner 6 is sealed at the bottom and open at the top, and is placed above the spring 9 in the crescent-shaped groove 10. It is movably connected to both the spring 9 and the crescent-shaped groove 10, and is in close contact with the inner cavity of the drill pipe body 2, but can move.

[0045] The upper end of the crescent-shaped cylinder liner 6 is restricted below the upper bend of the crescent-shaped groove 10, and the bottom of the drill rod connected to the upper connector 1 also limits the upper end of the crescent-shaped cylinder liner 6.

[0046] like Figure 4 As shown, when the controllable sand-cleaning drill pipe is lowered to a certain depth at the bottom of the well or the pump pressure rises to a certain level, the hydraulic pressure compresses the spring 9 through the crescent-shaped cylinder sleeve 6, causing the crescent-shaped cylinder sleeve 6 to move downwards. When the spring 9 is compressed to a certain extent, the upper end of the crescent-shaped cylinder sleeve 6 is lower than the inner port of the water hole 7 on the drill pipe sidewall. At this time, the drilling fluid is ejected at high speed through the water hole 7 on the drill pipe sidewall and the nozzle 8, and the controllable sand-cleaning drill pipe begins to work. When the pump pressure drops, under the tension of the spring 9, the crescent-shaped cylinder sleeve 6 floats upwards, sealing the inner port of the water hole 7 on the drill pipe sidewall, and the nozzle 8 stops flushing.

[0047] The working process of this controllable sand-cleaning drill rod is as follows:

[0048] Step 1: Select the model and specifications of spring 7 and nozzle 8 according to the current drilling depth and wellbore sand condition. After installing the selected spring 7 and nozzle 8, connect the controllable sand-cleaning drill pipe to other controllable sand-cleaning drill pipes or ordinary drill pipes through upper connector 1 and lower connector 3.

[0049] The second step is to send the controllable sand-cleaning drill pipe into the section of the well that needs sand cleaning. During the process, the pump can be turned on and circulated normally, while the controllable sand-cleaning drill pipe is kept in a non-working state.

[0050] The third step is to start the pump and the top drive, increase the discharge rate until the pump pressure rises to the point where the controllable sand-cleaning drill pipe is in working condition. The high-speed drilling fluid sprayed by the water jetting mechanism 5, together with the spiral protrusion 4, tangentially pushes the cuttings bed at the bottom edge of the wellbore, accelerating the stripping of the cuttings from the cuttings bed and into the annular fluid.

[0051] Fourth, during the sand removal process, closely observe the changes in parameters such as pump pressure and discharge rate. After the sand removal is completed, reduce the discharge rate until the pump pressure decreases, so that the controllable sand removal drill pipe is in a non-working state to prevent the high-speed drilling fluid ejected from the controllable sand removal drill pipe from scouring the unstable well section, and continue drilling or pull out the drill string.

[0052] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A controllable sand-cleaning drill rod, characterized in that, include: The upper connector (1) has a female thread at its upper end, which is used to connect with the male thread of the upper drill pipe; The drill pipe body (2) is connected below the upper connector (1); The lower connector (3) is connected to the lower part of the drill pipe body (2), and the lower end is a male thread, which is used to connect with the female thread of the drill pipe below. Spiral protrusions (4) are arranged on the outer periphery of the drill pipe body (2); The water spraying mechanism (5) includes a water eye (7) on the side wall of the drill rod and a nozzle (8). The inner port of the water eye (7) on the side wall of the drill rod is connected to the central channel of the drill rod. The outer end of the water eye (7) on the side wall of the drill rod is at the outlet of the spiral groove surface (12) of the spiral protrusion (4), and the nozzle (8) is installed in the outer port. The control mechanism (11) is used to control the opening and closing of the water spraying mechanism (5), including a spring (9), a crescent-shaped groove (10) and a crescent-shaped cylinder liner (6). The crescent-shaped groove (10) is fixedly connected to the inner wall of the drill rod body (2). The spring (9) is placed in the crescent-shaped groove (10) and its lower end is supported at the bottom of the crescent-shaped groove (10). The upper end of the crescent-shaped cylinder liner (6) is open, and the lower end is closed and pressed on top of the spring (9).

2. The controllable sand-cleaning drill rod according to claim 1, characterized in that: The nozzle (8) is a detachable structure, and the nozzle (8) extends outward along the tangential direction of the drill rod body (2).

3. The controllable sand-cleaning drill rod according to claim 1, characterized in that: The side wall of the crescent-shaped cylinder liner (6) is clearance-fitted with the crescent-shaped groove (10) and the inner wall of the drill rod body (2).

4. A controllable sand-cleaning drill rod according to claim 1, characterized in that: When the wellhead pump pressure is lower than the set value, the side wall of the crescent-shaped cylinder sleeve (6) blocks the inner port of the drill pipe side wall water hole (7).

5. A controllable sand-cleaning drill rod according to claim 1, characterized in that: The upper end of the crescent-shaped groove (10) is provided with a bent portion, and one side of the upper end of the crescent-shaped cylinder liner (6) is restricted below the bent portion at the upper end of the crescent-shaped groove (10).

6. A controllable sand-cleaning drill rod according to claim 5, characterized in that: The upper end of the crescent-shaped cylinder liner (6) is restricted to the lower side of the upper drill rod.

7. A controllable sand-cleaning drill rod according to claim 5, characterized in that: When the wellhead pump pressure exceeds the set value, the crescent-shaped cylinder liner (6) compresses the spring (9) and moves downward to open the inner port of the water hole (7) on the drill pipe sidewall.

8. A controllable sand-cleaning drill rod according to claim 5, characterized in that: The spring (9) is a detachable structure. Depending on the different vertical depths of the horizontal section of the wellbore, the spring (9) and nozzle (8) of the corresponding specifications can be replaced.

9. A controllable sand-cleaning drill rod according to claim 5, characterized in that: The crescent-shaped cylinder liner (6) is a high-strength wear-resistant cylinder liner.

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