A constant pulse force screw downhole tool

Abstract

The utility model relates to screw drill tool technical field provides a constant pulse force screw drill tool, including upper joint, one end of upper joint is installed with oscillation short section, one end of oscillation short section is installed with casing, the inside installation of oscillation short section has pulse structure, the utility model discloses is provided with pulse structure, through the eccentric hole design of static valve and dynamic valve, the stable support of bearing is combined, makes dynamic valve under the uniform speed rotation of drilling fluid pressure difference effect. In the process, the communication area of first eccentric hole and second eccentric hole changes periodically, forms stable pressure fluctuation, finally transforms into constant pulse force transmission to drill bit, and the accurate inlay of connecting sleeve through first shaft key and dynamic valve key groove, ensures that connecting sleeve is synchronous when dynamic valve rotates and has no deviation, the inlay of second shaft key in the one side of connecting shaft and liquid outlet inside, further restricts the radial displacement of connecting shaft, avoids the abrasion that the component was caused by the wobble in the process of pulse transmission.

Description

Technical Field

[0001] This utility model relates to the field of screw drill technology, and in particular to a constant pulse force screw drill. Background Technology

[0002] Screw drills are a type of downhole power drill that uses drilling fluid as the power medium. They are widely used in drilling projects such as oil, natural gas and geological exploration. They are mainly used to drive the drill bit to achieve bottom hole drilling operations. As the core power equipment in directional drilling and horizontal drilling operations, the performance of screw drills directly determines drilling efficiency, wellbore quality and operating costs.

[0003] Traditional screw drills rely primarily on a drive shaft to rotate the drill bit for single-rotation rock breaking. Their rock-breaking capability is highly dependent on the mechanical properties of the drill bit's cutting teeth and the matching degree between drilling pressure and rotational speed. In deep, hard rock formations, single-rotation cutting easily leads to rapid wear of the drill bit's cutting teeth. Simultaneously, the rock is prone to a "fatigue strengthening" effect due to continuous stress, significantly increasing rock-breaking resistance. Utility Model Content

[0004] The purpose of this invention is to provide a constant pulse force screw drill bit to solve the problem of low rock breaking efficiency of existing screw drill bits.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a constant pulse force screw drill, including an upper connector;

[0006] An oscillating section is installed at one end of the upper connector, a housing is installed at one end of the oscillating section, a universal joint assembly is installed at one end of the housing, a drive shaft assembly is installed at one end of the universal joint assembly, a pulse structure is installed inside the oscillating section, the pulse structure includes a stationary valve fixed to one side inside the oscillating section, a first central hole is provided at the middle position inside the stationary valve, first eccentric holes are provided on both sides inside the stationary valve, a bearing is installed inside the oscillating section, a moving valve is installed inside the bearing, a second central hole is provided at the middle position inside the moving valve, and second eccentric holes are provided at the edges inside the moving valve;

[0007] The housing is equipped with a connecting structure.

[0008] Preferably, a connecting sleeve is installed inside the second central hole at one end of the moving valve, a first shaft key is fixed on the outside of the connecting sleeve, a keyway is provided on the inside of the second central hole outside the first shaft key, a connecting pipe is fixed at one end of the connecting sleeve, a liquid outlet is provided on one side of the connecting pipe, a connecting shaft is installed at one end of the connecting pipe, a second shaft key is fixed on one side of the connecting shaft inside the liquid outlet, and a fixing block is fixed at one end of the connecting shaft.

[0009] Preferably, the first eccentric holes are symmetrically distributed on both sides inside the stationary valve, the moving valve and the stationary valve have the same diameter, one end of the moving valve abuts against one end of the stationary valve, the moving valve has a "T" shaped cross-section, the second eccentric holes are evenly distributed at the edge position inside the moving valve, the interior of the first eccentric hole is connected to the interior of the second eccentric hole, and the interior of the first central hole is connected to the interior of the second central hole.

[0010] With the above structure, the first and second central holes are connected internally during use, forming a mainstream drilling fluid passage. Most of the drilling fluid can flow directly through this passage to the subsequent connecting structure and screw motor, reducing the risk of flow channel blockage. The moving valve and the stationary valve have the same diameter and their end faces abut each other, making the chamber gap between them uniform. Combined with the connection design of the first and second eccentric holes, the flow path of the drilling fluid in the eccentric holes is more regular, avoiding local eddies caused by uneven chamber gaps or misalignment of holes.

[0011] Preferably, the outer side of the connecting sleeve is fitted with the inner side of the second central hole, the first shaft key is evenly distributed on the outer side of the connecting sleeve, the first shaft key corresponds to the keyway one by one, the outer side of the first shaft key is fitted with the inside of the keyway, and the outer side of the second shaft key is fitted with the inner side of the liquid outlet.

[0012] With the above structure, when the moving valve rotates at a constant speed under the action of drilling fluid pressure difference during use, the rotational power can be directly transmitted to the subsequent connecting pipe and connecting shaft through the connecting sleeve, avoiding delay or interruption of power transmission caused by gaps between components.

[0013] Preferably, the connection structure includes a limiting groove disposed on one side inside the housing, a rotating ring installed inside the limiting groove, a screw motor installed at one end of the rotating ring, a first hinge seat fixed at one end of the screw motor inside the universal joint assembly, a universal rod installed inside the first hinge seat, a second hinge seat installed at one end of the universal rod, and a transmission rod fixed on one side of the second hinge seat inside the transmission shaft assembly.

[0014] Preferably, the rotating ring is rotatably connected inside the limiting groove, one end of the screw motor is fixedly connected to one end of the fixed block, and both ends of the universal rod are respectively hinged to the interior of the first hinge seat and the second hinge seat.

[0015] With the above structure, the rotating ring is rotatably connected inside the limiting groove during use, which can provide radial limiting and rotational guidance for the screw motor. When the drilling fluid drives the screw motor rotor to rotate at high speed, the rotating ring can rotate synchronously and smoothly along the inner wall of the limiting groove, preventing the screw motor from radially shifting or wobbling due to centrifugal force, and ensuring that the screw motor rotor and stator always maintain precise fit.

[0016] The advantages of the constant pulse force screw drill provided by this utility model are as follows:

[0017] By incorporating a pulse structure and employing an eccentric orifice design for both the stationary and moving valves, combined with stable bearing support, the moving valve rotates at a uniform speed under the pressure difference of the drilling fluid. During this process, the communication area between the first and second eccentric orifices changes periodically, creating stable pressure fluctuations that are ultimately converted into a constant pulse force transmitted to the drill bit. The connecting sleeve, through the precise engagement of the first shaft key with the moving valve keyway, ensures that the connecting sleeve rotates synchronously and without deviation. The second shaft key on one side of the connecting shaft engages with the inner side of the fluid outlet, further limiting the radial displacement of the connecting shaft and preventing wear caused by component vibration during pulse transmission.

[0018] With a connecting structure, the universal joint is hinged to the first and second hinge seats at both ends. When the drill string deviates from its axis due to changes in the wellbore trajectory, the universal joint can flexibly adjust its angle to ensure that the rotational power of the screw motor and the pulse force of the pulse structure are stably transmitted to the drive shaft. One end of the screw motor is fixedly connected to the fixed block, and the other end is engaged with the housing limiting groove through a rotating ring. The flexible rotation of the rotating ring within the limiting groove ensures that there is no radial jamming when the screw motor rotor rotates. At the same time, the precise fit between the universal joint and the hinge seat reduces the gap loss during power transmission. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 This is a three-dimensional exploded view of the present invention;

[0021] Figure 3 This is a three-dimensional cross-sectional schematic diagram of the present invention;

[0022] Figure 4 For the present utility model Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is a three-dimensional exploded view of the pulse structure of this utility model.

[0024] The reference numerals in the figure are as follows: 1. Upper connector; 2. Oscillating sub; 3. Housing; 4. Universal joint assembly; 5. Drive shaft assembly; 6. Pulse structure; 601. Static valve; 602. First central hole; 603. First eccentric hole; 604. Bearing; 605. Dynamic valve; 606. Second central hole; 607. Second eccentric hole; 608. Connecting sleeve; 609. First shaft key; 610. Keyway; 611. Connecting pipe; 612. Liquid outlet; 613. Connecting shaft; 614. Second shaft key; 615. Fixing block; 7. Connecting structure; 701. Limiting groove; 702. Rotating ring; 703. Screw motor; 704. First hinge seat; 705. Universal rod; 706. Second hinge seat; 707. Drive rod. Detailed Implementation

[0025] 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.

[0026] Please see Figures 1-5 The present invention provides a constant pulse force screw drill, including an upper connector 1.

[0027] Reference Figures 1-5As shown, an oscillating sub 2 is installed at one end of the upper connector 1, a housing 3 is installed at one end of the oscillating sub 2, a universal joint assembly 4 is installed at one end of the housing 3, a drive shaft assembly 5 is installed at one end of the universal joint assembly 4, a pulse structure 6 is installed inside the oscillating sub 2, the pulse structure 6 includes a stationary valve 601 fixed to one side inside the oscillating sub 2, a first central hole 602 is provided at the middle position inside the stationary valve 601, and first eccentric holes 603 are provided on both sides inside the stationary valve 601. A bearing 60 is installed inside the oscillating sub 2. 4. A movable valve 605 is installed inside the bearing 604. A second central hole 606 is provided at the center of the movable valve 605, and second eccentric holes 607 are provided at the edges of the movable valve 605. A connecting sleeve 608 is installed inside the second central hole 606 at one end of the movable valve 605. A first shaft key 609 is fixed to the outside of the connecting sleeve 608. A keyway 610 is provided on the inside of the second central hole 606 outside the first shaft key 609. A connecting pipe 611 is fixed to one end of the connecting sleeve 608. A keyway 610 is provided on one side of the connecting pipe 611. A liquid outlet 612 is provided. A connecting shaft 613 is installed at one end of a connecting pipe 611. A second shaft key 614 is fixed to one side of the connecting shaft 613 inside the liquid outlet 612. A fixing block 615 is fixed to one end of the connecting shaft 613. The first eccentric holes 603 are symmetrically distributed on both sides inside the stationary valve 601. The diameter of the moving valve 605 is the same as that of the stationary valve 601. One end of the moving valve 605 abuts against one end of the stationary valve 601. The cross-section of the moving valve 605 is T-shaped. The second eccentric hole 607 is located inside the moving valve 605. The first eccentric hole 603 is evenly spaced at the edge position, and the interior of the first eccentric hole 603 is connected to the interior of the second eccentric hole 607. The interior of the first central hole 602 is connected to the interior of the second central hole 606. The outer side of the connecting sleeve 608 is fitted with the inner side of the second central hole 606. The first shaft key 609 is evenly spaced on the outer side of the connecting sleeve 608. The first shaft key 609 corresponds one-to-one with the keyway 610. The outer side of the first shaft key 609 is fitted with the interior of the keyway 610. The outer side of the second shaft key 614 is fitted with the inner side of the liquid outlet 612.

[0028] After the drilling fluid enters the oscillating sub 2 from the upper connector 1, it first flows into the interior of the stationary valve 601. The stationary valve 601 has a first central hole 602 in the middle and first eccentric holes 603 symmetrically distributed on both sides. Part of the drilling fluid flows directly to the second central hole 606 of the moving valve 605 through the first central hole 602, while the other part fills the chamber between the stationary valve 601 and the moving valve 605 to establish initial pressure. The moving valve 605 has a "T" shaped cross section and is rotatably connected to the inner wall of the oscillating sub 2 through a bearing 604. Second eccentric holes 607 are evenly distributed on its edges, and the second eccentric holes 607 are connected to the interior of the first eccentric holes 603 of the stationary valve 601. Due to the eccentric design of the first eccentric hole 603 and the second eccentric hole 607, a pressure difference is formed at the connection point of the two holes by the drilling fluid, which drives the moving valve 605 to rotate at a constant speed around the axis of the bearing 604. During the rotation of the moving valve 605, the connecting sleeve 608 on its outer side engages with the keyway 610 of the moving valve 605 through the first shaft key 609, and rotates synchronously with the moving valve. The connecting pipe 611 connected to one end of the connecting sleeve 608 cooperates with the outlet 612. When the moving valve 605 rotates, the communication area between the second eccentric hole 607 and the first eccentric hole 603 changes periodically: when the communication area is at its maximum, the drilling fluid flow rate increases and the chamber pressure decreases; when the communication area is at its minimum, the flow rate decreases and the chamber pressure increases. Then, through periodic pressure fluctuations, the force is transmitted to the fixed block 615 via the connecting pipe 611 and the connecting shaft 613. The fixed block 615 is then connected to the connecting structure 7 to transmit the stable pulse force to the subsequent power components. At the same time, the fitting design of the second shaft key 614 and the liquid outlet 612 ensures that the connecting shaft 613 does not deviate when it rotates, thus ensuring a constant output of pulse force.

[0029] Reference Figure 2 and Figure 3 As shown, a connecting structure 7 is installed inside the housing 3. The connecting structure 7 includes a limiting groove 701 located on one side inside the housing 3. A rotating ring 702 is installed inside the limiting groove 701. A screw motor 703 is installed at one end of the rotating ring 702. A first hinge seat 704 is fixed to one end of the screw motor 703 inside the universal shaft assembly 4. A universal rod 705 is installed inside the first hinge seat 704. A second hinge seat 706 is installed at one end of the universal rod 705. A transmission rod 707 is fixed to one side of the second hinge seat 706 inside the transmission shaft assembly 5. The rotating ring 702 is rotatably connected inside the limiting groove 701. One end of the screw motor 703 is fixedly connected to one end of the fixing block 615. The two ends of the universal rod 705 are respectively hinged to the interiors of the first hinge seat 704 and the second hinge seat 706.

[0030] Drilling fluid flowing through pulse structure 6 enters screw motor 703 inside housing 3 through outlet 612. One end of screw motor 703 is fixedly connected to fixed block 615, and the other end engages with rotating ring 702, which is installed in limiting groove 701 and can rotate along the limiting groove 701. Drilling fluid drives the rotor of screw motor 703 to rotate, converting fluid pressure energy into the mechanical rotational kinetic energy of the rotor. At the same time, the pulse force transmitted by pulse structure 6 is synchronously transmitted to subsequent components through screw motor 703. The rotational power and pulse force of screw motor 703 are transmitted to first hinge seat 704 in universal joint assembly 4. First hinge seat 704 is hinged to one end of universal rod 705, and the other end of universal rod 705 is hinged to second hinge seat 706. Since the drill string may tilt at a certain angle during drilling, the universal joint 705 uses hinged structures at both ends to achieve angle compensation, ensuring stable transmission of power and pulse force even when the drill string is not coaxial, thus avoiding power loss or structural damage. The second hinge seat 706 is fixedly connected to the transmission rod 707, which is installed inside the transmission shaft assembly 5, transmitting rotational power and pulse force to the transmission shaft. The transmission shaft is directly connected to the drill bit, ultimately driving the drill bit to rotate and drill. At the same time, a constant pulse force acts on the drill bit, which can effectively break rocks, reduce drill bit wear, and improve drilling speed and drilling quality.

[0031] 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 constant pulse force screw drill bit, comprising an upper connector (1); Its features are: One end of the upper connector (1) is equipped with an oscillating sub (2), one end of the oscillating sub (2) is equipped with a housing (3), one end of the housing (3) is equipped with a universal joint assembly (4), one end of the universal joint assembly (4) is equipped with a drive shaft assembly (5), the inside of the oscillating sub (2) is equipped with a pulse structure (6), the pulse structure (6) includes a stationary valve (601) fixed to one side inside the oscillating sub (2), a first central hole (602) is provided at the middle position inside the stationary valve (601), a first eccentric hole (603) is provided on both sides inside the stationary valve (601), a bearing (604) is installed inside the oscillating sub (2), a moving valve (605) is installed inside the bearing (604), a second central hole (606) is provided at the middle position inside the moving valve (605), and a second eccentric hole (607) is provided at the edge position inside the moving valve (605). The housing (3) has a connecting structure (7) installed inside.

2. The constant pulse force screw drill bit according to claim 1, characterized in that: A connecting sleeve (608) is installed inside the second central hole (606) at one end of the moving valve (605). A first shaft key (609) is fixed on the outside of the connecting sleeve (608). A keyway (610) is provided on the inside of the second central hole (606) on the outside of the first shaft key (609). A connecting pipe (611) is fixed at one end of the connecting sleeve (608). An outlet (612) is provided on one side of the connecting pipe (611). A connecting shaft (613) is installed at one end of the connecting pipe (611). A second shaft key (614) is fixed on one side of the connecting shaft (613) inside the outlet (612). A fixing block (615) is fixed at one end of the connecting shaft (613).

3. The constant pulse force screw drill bit according to claim 1, characterized in that: The first eccentric hole (603) is symmetrically distributed on both sides inside the stationary valve (601). The moving valve (605) has the same diameter as the stationary valve (601). One end of the moving valve (605) abuts against one end of the stationary valve (601). The cross-section of the moving valve (605) is T-shaped. The second eccentric hole (607) is evenly distributed at the edge inside the moving valve (605). The interior of the first eccentric hole (603) is connected to the interior of the second eccentric hole (607). The interior of the first central hole (602) is connected to the interior of the second central hole (606).

4. A constant pulse force screw drill bit according to claim 2, characterized in that: The outer side of the connecting sleeve (608) is fitted with the inner side of the second central hole (606). The first shaft key (609) is evenly distributed on the outer side of the connecting sleeve (608). The first shaft key (609) corresponds one-to-one with the keyway (610). The outer side of the first shaft key (609) is fitted with the inside of the keyway (610). The outer side of the second shaft key (614) is fitted with the inner side of the liquid outlet (612).

5. A constant pulse force screw drill bit according to claim 1, characterized in that: The connection structure (7) includes a limiting groove (701) disposed on one side inside the housing (3). A rotating ring (702) is installed inside the limiting groove (701). A screw motor (703) is installed at one end of the rotating ring (702). A first hinge seat (704) is fixed at one end of the screw motor (703) inside the universal shaft assembly (4). A universal rod (705) is installed inside the first hinge seat (704). A second hinge seat (706) is installed at one end of the universal rod (705). A transmission rod (707) is fixed on one side of the second hinge seat (706) inside the transmission shaft assembly (5).

6. A constant pulse force screw drill bit according to claim 5, characterized in that: The rotating ring (702) is rotatably connected inside the limiting groove (701), one end of the screw motor (703) is fixedly connected to one end of the fixing block (615), and the two ends of the universal rod (705) are respectively hinged to the interior of the first hinge seat (704) and the second hinge seat (706).

Images