Self-excited all-metal drilling pulse generator

Abstract

The present application relates to oilfield coiled tubing operation technical field, and disclose a kind of self-excitation type full metal drilling pulse generator, mainly by power system and oscillation system composition;The power system includes full metal helical stator and rotor;The rotor is rotated in full metal helical stator inside and form helical sealed cavity between each other;The oscillation system includes swing block seat and swing block of screw connection in the bottom of full metal helical stator;The swing block seat and swing block are hot mounted between each other, and swing block seat and swing block are interference fit;Fixed block is arranged in the bottom of the swing block;The top joint is connected in the top of the full metal helical stator, and the rotor end stopper is built-in in the top joint;By reducing drilling tool friction resistance, static friction is converted into dynamic friction, so as to significantly improve drilling speed, ensure the stable control of well trajectory;Adopt full metal stator and rotor power structure, effectively expand temperature use range and corrosion resistance range.

Description

Technical Field

[0001] This invention relates to the field of oilfield coiled tubing operation technology, specifically to a self-excited all-metal drilling pulse generator. Background Technology

[0002] Coiled tubing can perform complex drilling tasks such as small-diameter drilling, directional well trajectory control, and sidetracking / horizontal well drilling. It is also suitable for well completion operations such as well washing and sand flushing, acidizing to remove blockages, cementing plugs, and installing bridge plugs. Its flexibility and sealing properties effectively control wellbore pressure and reduce formation damage in underbalanced drilling. Currently, directional and horizontal wells are increasingly common in oil, gas, and geothermal drilling. In directional drilling, pressure build-up often occurs, severely impacting the drilling cycle. This is compounded by the influence of corrosive underground media and temperature.

[0003] The service life and stability of traditional drilling pulse generators, which use rubber or rubber motors with equal wall thickness for their power components, are greatly limited. Therefore, we propose a self-excited all-metal drilling pulse generator to solve this technical deficiency. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a self-excited all-metal drilling pulse generator, comprising a power system and an oscillation system;

[0005] The power system includes an all-metal spiral stator and a rotor;

[0006] The rotors are arranged to rotate inside the all-metal spiral stator and form spiral sealed cavities with each other;

[0007] The oscillation system includes a swing block seat and a swing block that are threadedly connected to the bottom of the all-metal spiral stator;

[0008] The swing block seat and the swing block are thermally installed together, and the swing block seat and the swing block are interference fit.

[0009] The oscillation system also includes a fixed block disposed at the bottom of the swing block;

[0010] The all-metal spiral stator is connected to a top connector, and the top connector has a built-in rotor end stop.

[0011] The lower part of the all-metal spiral stator is connected to a bottom connector;

[0012] Driven by the liquid, the power system generates mechanical kinetic energy, which drives the lower oscillation system to generate pulse pressure, thereby producing axial vibration.

[0013] Furthermore, the swing block and the fixed block are in planar contact, and the bottom diameter of the swing block is smaller than the top diameter of the fixed block.

[0014] Furthermore, a coaxial through hole is provided in the middle of the swing block, and an eccentric through hole is provided on the fixed block.

[0015] Furthermore, the coaxial through holes and the eccentric through holes are interconnected in an alternating manner.

[0016] Furthermore, the swing block has a built-in adjustment component that can change the size of the coaxial through hole, and the top of the swing block has an expansion slot extending outward from the coaxial through hole.

[0017] Furthermore, the adjustment assembly includes a placement slot formed inside the coaxial through hole, and:

[0018] Rotatably connected to the arc-shaped plate at the top of the coaxial through hole;

[0019] A drive component is disposed between the arc-shaped plate and the placement groove, the drive component changing the distance between the bottoms of the arc-shaped plate.

[0020] Furthermore, the driving component includes a slide rod vertically fixed to the back of the arc-shaped plate, and:

[0021] A sliding block slidably connected to the slide rod;

[0022] A rotating rod is connected between the slide and the middle of the placement groove, and the rotating rod is initially inclined toward the slide.

[0023] A movable ring is fitted onto the back of the arc-shaped plate, and the movable ring is located inside the placement groove;

[0024] A telescopic component is connected between the placement slot and the moving ring. The telescopic component controls the moving ring to move up and down to press the rotating rod to rotate.

[0025] Furthermore, a stop block is vertically fixed at the bottom of the movable ring corresponding to the position of the rotating rod, and a roller is rotatably connected to the bottom of the stop block.

[0026] Furthermore, limit posts are fixed at both ends of the slide rod, and shock-absorbing pads for protection are vertically provided on the limit posts.

[0027] Furthermore, the bottom of the arc-shaped plate is triangular.

[0028] Compared with the prior art, the present invention provides a self-excited all-metal drilling pulse generator, which has the following beneficial effects:

[0029] 1. The oscillating section generates pressure fluctuations through the periodic opening and closing of the swing block and the fixed block, forming an upward thrust and a downward impact force; combined with the all-metal stator and rotor assembly, it generates a dual power of "rotation + impact". This power can effectively improve the drilling effect in oilfield coiled tubing operations when drilling bridge plugs are being ground and drilling tool friction resistance is being reduced.

[0030] 2. The power unit of this invention mainly adopts an all-metal stator and rotor design, which effectively improves the operating temperature range and corrosion resistance range, better adapts to drilling needs, and extends the service life of the hydraulic oscillator.

[0031] 3. In this invention, the size of the coaxial through hole of the swing block can be adjusted by the adjustment component, and the oscillation frequency can be adjusted as needed, making it suitable for scenarios with different oscillation frequencies;

[0032] 4. The present invention has a simple structure, is easy to maintain, effectively reduces the cost of use, and has significant economic benefits. Attached Figure Description

[0033] Figure 1 This is a perspective view of a self-excited all-metal drilling pulse generator proposed in this invention;

[0034] Figure 2 This is a schematic diagram of the structure of a self-excited all-metal drilling pulse generator swing block proposed in this invention;

[0035] Figure 3 This is a half-sectional view of the swing block of a self-excited all-metal drilling pulse generator proposed in this invention;

[0036] Figure 4 This is a schematic diagram of the structure of a self-excited all-metal drilling pulse generator fixing block proposed in this invention;

[0037] Figure 5 This is a half-sectional view of a self-excited all-metal drilling pulse generator fixing block proposed in this invention;

[0038] Figure 6 This is a schematic diagram of the rotor structure of a self-excited all-metal drilling pulse generator proposed in this invention;

[0039] Figure 7 This invention proposes a self-excited all-metal drilling pulse generator. Figure 6 Sectional view at point AA along the middle;

[0040] Figure 8 This invention proposes a self-excited all-metal drilling pulse generator. Figure 7 Cross-sectional view at the middle edge BB;

[0041] Figure 9This is a schematic diagram of the installation structure of a self-excited all-metal drilling pulse generator adjustment assembly proposed in this invention.

[0042] Figure 10 This is a schematic diagram of the structure of a self-excited all-metal drilling pulse generator adjustment component proposed in this invention.

[0043] In the diagram: 100, top connector; 200, rotor end stop; 300, all-metal spiral stator; 400, rotor; 500, swing block seat; 600, swing block; 700, fixed block; 800, bottom connector; 900, adjusting assembly; 901, placement slot; 902, arc plate; 903, slide rod; 904, slide seat; 905, rotating rod; 906, moving ring; 907, stop block; 908, telescopic component. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figure 1 - Figure 8 A self-excited all-metal drilling pulse generator, consisting of a power system and an oscillation system;

[0046] The power system includes an all-metal spiral stator 300 and a rotor 400. The all-metal spiral stator 300 is an all-metal multi-start spiral structure, and the rotor 400 is an all-metal spiral structure. Both the all-metal multi-start spiral structure and the all-metal spiral structure are common constructions in this technical field.

[0047] The rotor 400 is housed inside the all-metal spiral stator 300 and rotates therewith, forming a spiral sealed cavity with each other.

[0048] The oscillation system includes a swing block seat 500 and a swing block 600 that are threadedly connected to the bottom of the all-metal spiral stator 300;

[0049] The swing block seat 500 and the swing block 600 are thermally installed together, and the swing block seat 500 and the swing block 600 are interference fit. Because of the interference fit, the swing block seat 500 is heated and deformed by heat so that it can be stuck on the swing block 600 to achieve the installation purpose.

[0050] A fixing block 700 is set at the bottom of the swing block 600;

[0051] The all-metal spiral stator 300 is connected to a top connector 100, and the top connector 100 has a built-in rotor end stop 200.

[0052] The all-metal spiral stator 300 is connected to a bottom connector 800 for bottom connection.

[0053] Driven by the liquid, the power system generates mechanical kinetic energy, which drives the lower oscillating system to generate pulse pressure, thereby producing axial vibration;

[0054] The swing block 600 and the fixed block 700 are in planar contact, and the bottom diameter of the swing block 600 is smaller than the top diameter of the fixed block 700;

[0055] The swing block 600 has a coaxial through hole in the middle, and the fixed block 700 has an eccentric through hole. The coaxial through hole and the eccentric through hole are interconnected in an alternating manner.

[0056] During use, after being lowered into the well, the liquid enters the power system and flows through the spiral sealed cavity formed by the all-metal spiral stator 300 and the rotor 400, creating a dynamic pressure difference between the chambers. This pressure difference drives the rotor 400 to perform planetary motion around the axis of the all-metal spiral stator 300. The liquid passes through the flow hole at the end of the rotor 400, through the coaxial through hole of the swing block 600, and the eccentric through hole of the fixed block 700. The swing block 600 reciprocates under the eccentric rotation of the rotor 400. Since the coaxial through hole of the swing block 600 and the eccentric through hole of the fixed block 700 are designed to be non-concentric, they periodically stagger and overlap, changing the cross-sectional area of ​​the fluid and generating pressure fluctuations, thereby generating axial oscillation force. To prevent the rotor 400 from moving under pressure fluctuations, the rotor end stop 200 restricts the movement of the rotor 400 during operation.

[0057] Please see Figure 1 , Figure 9 and Figure 10 The swing block 600 has a built-in adjustment component 900 that can change the size of the coaxial through hole, and the top of the swing block 600 is provided with an expansion slot that extends outward from the coaxial through hole.

[0058] In use, the liquid enters the swing block 600 through the expansion groove, which is more convenient. By using the adjustment component 900, the liquid flow rate of the coaxial through hole can be adjusted to change the magnitude of the oscillation force.

[0059] Please see Figure 1 , Figure 9 and Figure 10 The adjustment assembly 900 includes a placement slot 901 formed inside the coaxial through hole, and:

[0060] Rotary connection to the arc-shaped plate 902 at the top of the coaxial through hole;

[0061] A driving component is provided between the arc-shaped plate 902 and the placement groove 901, and the driving component changes the distance between the bottoms of the arc-shaped plate 902;

[0062] The drive component includes a slide bar 903 vertically fixed to the back of the curved plate 902, and:

[0063] Sliding block 904 is slidably connected to slide rod 903;

[0064] A rotating rod 905 is connected between the middle of the slide 904 and the placement groove 901. The rotating rod 905 is initially inclined toward the slide 904 to facilitate the use of the moving ring 906.

[0065] A movable ring 906 is fitted onto the back of the arc-shaped plate 902, and the movable ring 906 is located inside the placement groove 901;

[0066] The telescopic component 908 connects the placement slot 901 and the moving ring 906. The telescopic component 908 adopts an electric push rod, which is existing technology and will not be described in detail here. The specific model is selected according to the actual use. The telescopic component 908 controls the moving ring 906 to move up and down to press the rotating rod 905 to rotate.

[0067] In use, the telescopic component 908 is activated to extend and retract. The extension and retraction of the telescopic component 908 causes the moving ring 906 to move downward. The downward movement of the moving ring 906 contacts the rotating rod 905, causing the rotating rod 905 to drive the slide block 904 to slide downward on the slide rod 903, thereby rotating the arc plate 902 into the coaxial through hole, thus changing the flow rate of the liquid inside the coaxial through hole. When the telescopic component 908 returns to its original position, the arc plate 902 is impacted and returns to its original position.

[0068] Please see Figure 10 A stop block 907 is vertically fixed at the bottom of the moving ring 906, corresponding to the position of the rotating rod 905, and a roller is rotatably connected to the bottom of the stop block 907.

[0069] In use, the moving ring 906 contacts the rotating rod 905 through the roller on the abutment block 907. The contact between the two will not cause surface damage.

[0070] Among them, the top and bottom ends of the slide rod 903 are fixed with limit posts to limit the sliding position of the slide block 904. The limit posts are vertically provided with shock-absorbing pads for protection to reduce direct contact and buffer. The bottom of the arc plate 902 is triangular, so that when the bottoms of the arc plates 902 rotate inward, they will not contact each other and affect the rotation.

[0071] Working principle: The top connector 100 and bottom connector 800 are connected vertically. Liquid enters the all-metal spiral stator 300 through the top connector 100, creating a dynamic pressure difference between the chambers. This pressure difference drives the rotor 400 to perform planetary motion around the axis of the all-metal spiral stator 300. The liquid passes through the flow holes at the end of the rotor 400, through the coaxial through-hole of the swing block 600, and the eccentric through-hole of the fixed block 700. Driven by the eccentric rotation of the rotor 400, the swing block 600 reciprocates. Because the coaxial through-hole of the swing block 600 and the eccentric through-hole of the fixed block 700 are designed to be non-concentric, they periodically stagger and overlap, changing the fluid cross-sectional area. Pressure fluctuations are generated, resulting in axial oscillation force. By adjusting component 900, the telescopic component 908 is activated to extend and retract. The extension and retraction of the telescopic component 908 causes the moving ring 906 to move downward. The downward movement of the moving ring 906 contacts the rotating rod 905, causing the rotating rod 905 to drive the slide block 904 to slide downward on the slide rod 903. This rotates the arc plate 902 into the coaxial through hole, thereby changing the flow rate of the liquid inside the coaxial through hole and thus changing the oscillation frequency. To prevent the rotor 400 from moving under pressure fluctuations, the rotor end stop 200 restricts the rotor 400's position movement during operation.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-excited all-metal drilling pulse generator, characterized in that: It consists of a power system and an oscillation system; The power system includes an all-metal spiral stator (300) and a rotor (400). The rotor (400) is disposed inside the all-metal spiral stator (300) and rotates therewith, forming a spiral sealed cavity between them; The oscillation system includes a swing block seat (500) and a swing block (600) threadedly connected to the bottom of an all-metal spiral stator (300). The swing block seat (500) and the swing block (600) are thermally mounted, and the swing block seat (500) and the swing block (600) are interference fit; The oscillation system also includes a fixed block (700) disposed at the bottom of the swing block (600); The all-metal spiral stator (300) is connected to a top connector (100) at the top, and the top connector (100) has a built-in rotor end stop (200). The lower part of the all-metal spiral stator (300) is connected to a bottom connector (800). Driven by the liquid, the power system generates mechanical kinetic energy, which drives the lower oscillation system to generate pulse pressure, thereby producing axial vibration. The swing block (600) and the fixed block (700) are in planar contact, and the bottom diameter of the swing block (600) is smaller than the top diameter of the fixed block (700); The swing block (600) has a built-in adjustment component (900) that can change the size of the coaxial through hole, and the top of the swing block (600) is provided with an expansion groove that extends outward from the coaxial through hole; The adjustment assembly (900) includes a placement slot (901) formed inside the coaxial through hole, and: Rotary connection to the top of the coaxial through hole (902); A driving component is disposed between the arc-shaped plate (902) and the placement groove (901), the driving component changing the distance between the bottoms of the arc-shaped plate (902); The driving component includes a slide rod (903) vertically fixed to the back of the arc-shaped plate (902), and: A slide block (904) is slidably connected to the slide rod (903); A rotating rod (905) is connected between the middle of the slide (904) and the placement groove (901), and the rotating rod (905) is initially inclined toward the slide (904); A movable ring (906) is fitted onto the back of the arc-shaped plate (902), and the movable ring (906) is located inside the placement groove (901); A telescopic member (908) is connected between the placement slot (901) and the moving ring (906). The telescopic member (908) controls the moving ring (906) to move up and down to press the rotating rod (905) to rotate.

2. The self-excited all-metal drilling pulse generator according to claim 1, characterized in that: The swing block (600) has a coaxial through hole in the middle, and the fixed block (700) has an eccentric through hole.

3. A self-excited all-metal drilling pulse generator according to claim 2, characterized in that: The coaxial through holes and the eccentric through holes are interconnected in an alternating manner.

4. A self-excited all-metal drilling pulse generator according to claim 1, characterized in that: The bottom of the moving ring (906) is vertically fixed with a stop block (907) at the position corresponding to the rotating rod (905), and the bottom of the stop block (907) is rotatably connected with a roller.

5. A self-excited all-metal drilling pulse generator according to claim 1, characterized in that: The slide bar (903) has limit posts fixed at both ends, and shock-absorbing pads for protection are vertically provided on the limit posts.

6. A self-excited all-metal drilling pulse generator according to claim 1, characterized in that: The bottom of the arc-shaped plate (902) is triangular.

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