An excitation-opening type pressure pulse generating device

Abstract

The present invention discloses an actuating opening type pressure pulse generating device, which comprises an upper sub, a ball seat outer cylinder, a screw outer cylinder, a flapper valve outer cylinder and a lower sub connected in sequence; a circulation cylinder is arranged in the ball seat outer cylinder, and the lower end of the circulation cylinder is inserted and connected with an upper flexible mandrel; the circulation cylinder is connected with a ball seat through a shear pin, and circulation holes are formed in the side wall of the circulation cylinder; a screw stator and a screw rotor are sequentially embedded in the screw outer cylinder, and two ends of the screw rotor are respectively connected with the upper flexible mandrel and a lower flexible mandrel located in the flapper valve outer cylinder; an upper flapper valve is arranged at the lower end of the lower flexible mandrel, and the upper flapper valve is matched with a lower flapper valve arranged at the upper end of the lower sub. The actuating opening type pressure pulse generating device of the present invention adopts a ball-throwing actuating opening structure, can realize the selective opening of pressure pulse fluctuations, ensures operation safety and improves the service life of the tool.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well drilling and completion, and particularly relates to an excitation-activated pressure pulse generating device. Background Art

[0002] At present, the proportion of horizontal wells and extended reach wells is increasing. During the horizontal section drilling of horizontal wells and extended reach wells, due to the self-weight of the drill string in the horizontal section pressing against the wellbore wall, a large frictional force will be generated between the drill string and the wellbore wall. As the horizontal section extends, the frictional resistance will become larger and larger, which will lead to the phenomenon of drill string sticking, affecting the drilling speed, and will also cause difficulties in the swing of the tool face, affecting directional control. At present, the pressure pulse generating device cooperates with the vibration part of the hydraulic oscillator to realize the axial vibration of the hydraulic oscillator, reducing friction and resistance. However, at present, all pressure pulse generating devices start working immediately when the pump is started, and cannot be selectively activated, which has potential safety hazards and affects the service life. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides an excitation-activated pressure pulse generating device, which can realize the selective activation of pressure pulses, ensure operation safety, and improve the service life of the tool.

[0004] The present application is achieved by adopting the following technical solutions.

[0005] An excitation-activated pressure pulse generating device includes an upper sub, a ball seat outer cylinder, a screw outer cylinder, a flapper valve outer cylinder, and a lower sub connected in sequence; a circulation cylinder is arranged inside the ball seat outer cylinder, and the lower end of the circulation cylinder is inserted and connected with an upper flexible mandrel; a ball seat is connected to the circulation cylinder through a shear pin inside the circulation cylinder, and circulation holes are formed on the side wall of the circulation cylinder; a screw stator and a screw rotor are sequentially embedded inside the screw outer cylinder, and both ends of the screw rotor are respectively connected with the upper flexible mandrel and a lower flexible mandrel located inside the flapper valve outer cylinder; an upper flapper valve is arranged at the lower end of the lower flexible mandrel, and the upper flapper valve cooperates with a lower flapper valve arranged at the upper end of the lower sub.

[0006] Further, a through central through-hole is formed inside the circulation cylinder, and the ball seat is arranged inside the central through-hole and connected with the side wall of the circulation cylinder through a shear pin.

[0007] Further, a keyway is arranged on the upper part of the outer wall of the circulation cylinder, and the keyway matches the key on the inner wall of the ball seat outer cylinder.

[0008] Further, a wear-resistant sleeve is sleeved on the upper end of the upper flexible mandrel, and the wear-resistant sleeve is inserted into the central through-hole of the circulation cylinder.

[0009] Further, through-flow channels are formed inside the upper flexible mandrel, the screw rotor, and the lower flexible mandrel.

[0010] Further, central holes are formed in the centers of the upper and lower wafer valves, and waist-shaped grooves are formed around the central holes.

[0011] The present application has the following beneficial effects.

[0012] The excitation-opening type pressure pulse generating device of the present invention adopts a ball-throwing excitation-opening structure, which can selectively open the pressure pulse fluctuation, ensures the operation safety, and improves the service life of the tool. The structure of the present invention is ingeniously designed, safe and reliable, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a structural schematic diagram of the present invention;

[0014] Figure 2 is a sectional view of the upper wafer valve of the present invention;

[0015] Figure 3 is a sectional view of the lower wafer valve of the present invention;

[0016] Figure 4 is a structural schematic diagram of the circulation cylinder of the invention.

[0017] Among them, 1. upper joint; 2. ball seat outer cylinder; 3. screw outer cylinder; 4. wafer valve outer cylinder; 5. lower joint; 6. circulation cylinder; 61. central through hole; 62. circulation hole; 63. keyway; 64. key; 7. ball seat; 8. shear pin; 9. wear-resistant sleeve; 10. upper flexible mandrel; 11. screw rotor; 12. screw stator; 13. lower flexible mandrel; 14. upper wafer valve; 141. first central hole; 142. first waist-shaped groove; 15. lower wafer valve; 151. second central hole; 152. second waist-shaped groove; 16. ball. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present invention will be further described below with reference to the drawings and embodiments.

[0019] As Figures 1-4 shown, an excitation-opening type pressure pulse generating device includes five parts: a tool outer cylinder, a power generating device, a pulse pressure wave generating device, a fluid diversion device, and an eccentricity elimination device.

[0020] The tool outer cylinder includes an upper joint 1, a ball seat outer cylinder 2, a screw outer cylinder 3, a wafer valve outer cylinder 4, and a lower joint 5 that are sequentially connected by threads.

[0021] The fluid diverter device includes a ball seat 7, a circulation cylinder 6, and a shear pin 8. A circulation cylinder 6 is provided inside the outer cylinder 2 of the ball seat. Specifically, the upper part of the circulation cylinder 6 has an enlarged diameter to form a boss. A plurality of key grooves 63 are provided on the outer wall of the boss. The key grooves 63 match the keys on the inner wall of the outer cylinder 2 of the ball seat. After the circulation cylinder 6 is radially fixed to the outer cylinder 2 of the ball seat through the key grooves, it can effectively prevent the circulation cylinder 6 from rotating relatively in the radial direction, and a gap is formed between the middle and lower parts of the circulation cylinder 6 and the inner wall of the outer cylinder 2 of the ball seat. A plurality of keys 64 are arranged at equal intervals along the circumferential direction of the lower part of the circulation cylinder 6. The upper surface of the keys 64 contacts the inner surface of the outer cylinder 2 of the ball seat, playing a role in centering. The arrangement of the keys 64 can prevent the circulation cylinder 6 from swinging, ensuring the working effect of the tool. A through central through hole 61 is formed inside the circulation cylinder 6 of the present application. The ball seat 7 is arranged inside the central through hole 61 and is located in the upper middle part of the central through hole 61. The ball seat 7 is connected to the side wall of the circulation cylinder 6 through a shear pin 8, and a flow passage is formed in the center of the ball seat 7. A plurality of circulation holes 62 are also formed on the side wall of the circulation cylinder 6 of the present application. The circulation holes 62 are located in the middle of the circulation cylinder 6. After the ball seat 7 is fixed to the circulation cylinder 6 through a shear pin 8, the ball seat 7 closes the circulation holes 62.

[0022] The power generating device includes a screw stator 12 and a screw rotor 11. A screw stator 12 is provided inside the outer screw cylinder 3. A screw rotor 11 is provided inside the screw stator 12, and a gap is provided between the screw stator 12 and the screw rotor 11. The screw rotor 11 is a hollow structure, and a flow passage is provided inside it.

[0023] The eccentricity elimination device includes an upper flexible mandrel 10, a lower flexible mandrel 13, and a wear-resistant sleeve 9. The upper flexible mandrel 10 is arranged inside the outer cylinder 2 of the ball seat. A gap is formed between the upper flexible mandrel 10 and the inner wall of the outer cylinder 2 of the ball seat. The upper end of the upper flexible mandrel 10 is threadedly connected to the wear-resistant sleeve 9, and the wear-resistant sleeve 9 is inserted into the lower end of the circulation cylinder 6. The lower end of the upper flexible mandrel 10 is threadedly connected to the upper end of the screw rotor 11. The lower flexible mandrel 13 is located inside the outer flapper cylinder 4. A gap is formed between the lower flexible mandrel 13 and the inner wall of the outer flapper cylinder 4. The upper end of the lower flexible mandrel 13 is threadedly connected to the lower end of the screw rotor 11, and the lower end of the lower flexible mandrel 13 is threadedly connected to the upper flapper 14. The upper and lower flexible mandrels of the present application are made of flexible metal materials, which can eliminate the influence of rotor eccentricity and are hollow structures. The outer surface of the wear-resistant sleeve 9 is hardened and wear-resistant treated. Correspondingly, the inner wall of the lower end of the central through hole 61 of the circulation cylinder 6 is surface-hardened and wear-resistant treated.

[0024] The pulse pressure wave generating device includes an upper flapper valve 14 and a lower flapper valve 15; the upper flapper valve 14 is located at the lower part of the flapper valve outer cylinder 4, and the inner lower part of the flapper valve outer cylinder 4 is subjected to surface hardening for wear prevention; a first central hole 141 is formed in the center of the upper flapper valve 14, and a first waist-shaped groove 142 is formed around the first central hole 141. The first waist-shaped groove 142 is an arc-shaped groove with the center of the circle coinciding with the center of the first central hole 141; the lower flapper valve 15 is connected to the upper end of the lower joint 5, a second central hole 151 is formed in the center of the lower flapper valve 15, and a second waist-shaped groove 152 is formed around the second central hole 151. The second waist-shaped groove 152 is an arc-shaped groove with the center of the circle coinciding with the center of the second central hole 151, and the groove shapes and sizes of the first waist-shaped groove 142 and the second waist-shaped groove 152 are the same. In this application, both the upper and lower flapper valves are designed with waist-shaped grooves that are through holes in the center. When the upper flapper valve rotates, the flow area of the waist-shaped groove changes.

[0025] The working principle of the present invention is as follows: When the tool is normally connected, the circulation hole 62 is in a closed state at this time, and the fluid flows out through the central flow channels of the upper joint 1, the ball seat 7, the circulation cylinder 6, the upper flexible mandrel 10, the screw rotor 11, the lower flexible mandrel 13, the upper flapper valve 14, and the lower flapper valve 15, without generating pressure fluctuations, and the hydraulic oscillator does not vibrate; when pressure pulses need to be generated, the ball 16 is dropped, the ball 16 sits on the ball seat 7, the pressure rises, the shear pin 8 is damaged, the ball seat 7 moves downward, the circulation hole 62 is opened, the central through hole 61 is blocked by the ball 16, and the fluid flows through the circulation hole 62 and flows through the gaps between the circulation cylinder 6 and the outer cylinder 2 of the ball seat, between the upper flexible mandrel 10 and the outer cylinder 2 of the ball seat, between the screw stator 12 and the screw rotor 11, and between the flapper valve outer cylinder 4 and the lower flexible mandrel 13. At the same time, the screw rotor 11 drives the upper flapper valve 14 to rotate, the upper and lower flapper valves move relative to each other, and the flow area of the waist-shaped groove changes, generating pressure pulses. When the tool acts underground, the lower power assembly drives the upper and lower flapper valves to move relative to each other, generating pressure pulses, which are transmitted upward, and the thruster is driven to generate axial vibration through the pressure pulses, thereby causing the drill string to produce creep.

[0026] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An excitation-opening type pressure pulse generating device, characterized in that: It includes an upper joint (1), a ball seat outer cylinder (2), a screw outer cylinder (3), a flapper valve outer cylinder (4) and a lower joint (5) connected in sequence; a circulation cylinder (6) is arranged in the ball seat outer cylinder (2), and the lower end of the circulation cylinder (6) is inserted into the upper flexible mandrel (10); the circulation cylinder (6) is connected with a ball seat (7) through a shear pin (8) inside, and a circulation hole (62) is formed on the side wall of the circulation cylinder (6); a screw stator (12) and a screw rotor (11) are sequentially embedded in the screw outer cylinder (3), and both ends of the screw rotor (11) are respectively connected with the upper flexible mandrel (10) and the lower flexible mandrel (13) located in the flapper valve outer cylinder (4); a upper flapper valve (14) is arranged at the lower end of the lower flexible mandrel (13), and the upper flapper valve (14) is matched with a lower flapper valve (15) arranged at the upper end of the lower joint (5).

2. The excitation-opening type pressure pulse generating device according to claim 1, wherein: A through central through-hole (61) is formed in the circulation cylinder (6), and the ball seat (7) is arranged in the central through-hole (61) and connected with the side wall of the circulation cylinder (6) through a shear pin (8).

3. The excitation-opening type pressure pulse generating device according to claim 1, characterized in that: A key groove (63) is arranged on the upper part of the outer wall of the circulation cylinder (6), and the key groove (63) is matched with a key on the inner wall of the ball seat outer cylinder (2).

4. The excitation-activated pressure pulse generating device according to claim 1, characterized in that: A wear-resistant sleeve (9) is sleeved on the upper end of the upper flexible mandrel (10), and the wear-resistant sleeve (9) is inserted into the central through-hole (61) of the circulation cylinder (6).

5. The excitation and opening type pressure pulse generating device according to claim 1, wherein: Through-flow channels are formed in the upper flexible mandrel (10), the screw rotor (11) and the lower flexible mandrel (13).

6. The excitation-activated pressure pulse generating device according to claim 1, wherein: Central holes are formed in the centers of the upper flapper valve (14) and the lower flapper valve (15), and waist-shaped grooves are formed around the central holes.

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