Adjustable hydraulic oscillation short section

Abstract

The utility model discloses an adjustable hydraulic oscillation nipple, including upper joint, the telescopic joint is inserted in upper joint, and the lower end reduced diameter section of telescopic joint is matched with the spline groove of upper joint through spline, and the lower end of upper joint is connected with the shell, the lower end of telescopic joint is inserted into the upper port of shell and is equipped with the transmission pressure cover below, and the axial flow channel that passes through is equipped along the axis of telescopic joint and transmission pressure cover, the static valve is equipped in transmission pressure cover inner chamber, and the lower portion of static valve is equipped with the dynamic valve, and the dynamic valve is the stepped shape of upper narrow lower wide, and the upper end of dynamic valve inserts transmission pressure cover lower portion inner chamber and is equipped with annular flow channel between the inner wall of transmission pressure cover, and the lower end annular outer step of dynamic valve is in abutment in transmission pressure cover below, and the bottom of dynamic valve is equipped with spring, and dynamic valve and spring are all sleeved on the upper portion of central shaft, and the outer periphery of the middle segment of central shaft and the inner wall of shell are equipped with turbine drive mechanism. The tool can improve the rate of penetration and drilling efficiency, prolong the tool life, reduce the drilling cost.

Description

Technical Field

[0001] This utility model relates to a hydraulic oscillator, and more particularly to an adjustable hydraulic oscillator sub-section, belonging to the technical field of oil and gas drilling tools. Background Technology

[0002] With the development of oil exploration and development technologies, the proportion of horizontal wells is gradually increasing. During horizontal well drilling, the issue of drill pressure backing is one of the key factors limiting the horizontal extension of the well. The core of the drill pressure backing problem is that the drill string experiences high friction during drilling, which prevents the drilling pressure at the wellhead from being effectively transmitted to the area near the drill bit, thus causing the drill bit to be unable to penetrate.

[0003] Hydraulic oscillators are an important drilling tool for solving the pressure problem during horizontal well drilling. This tool is installed in the middle of the drill pipe and uses high-pressure drilling fluid as the driving medium to convert a portion of the hydraulic kinetic energy into mechanical energy, thereby generating high-frequency axial reciprocating oscillations in the middle of the drill pipe. This forces the drill string around the hydraulic oscillator to produce axial displacement, increasing the relative speed between the drill pipe and the well wall. As a result, the relative friction between the drill pipe and the well wall around the hydraulic oscillator is transformed from static friction to dynamic friction, achieving the effect of reducing friction and drag.

[0004] Currently, hydraulic oscillators have been widely adopted and successfully applied in drilling sites, gradually becoming a standard tool for horizontal well drilling. However, this type of tool also has room for optimization. For example, the parameters of conventional hydraulic oscillators are not adjustable; once they start working, their oscillation frequency and amplitude cannot be adjusted, meaning that these tools operate at full capacity after circulating drilling fluid. In actual drilling, the severity of downhole pressure is not constant. For instance, after the tool is initially lowered to the bottom of the well, it generally needs to circulate drilling fluid for a period of time to bring cuttings back to the surface. During this time, drilling is not required, meaning the hydraulic oscillator does not need to operate. Traditional hydraulic oscillators start operating during drilling fluid circulation, creating unnecessary non-operating time that significantly reduces their lifespan. Utility Model Content

[0005] 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.

[0006] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0007] The purpose of this invention is to solve the problems of pressure and sticking caused by excessive frictional resistance during drilling, and to provide an adjustable hydraulic oscillation sub that can improve mechanical drilling speed and drilling efficiency, extend tool life, and reduce drilling costs.

[0008] To solve the above technical problems, this utility model provides an adjustable hydraulic oscillation sub, including an upper connector, into which a telescopic connector is inserted. The lower end of the telescopic connector, with its reduced diameter section, engages with the spline groove of the upper connector via a spline. The lower end of the upper connector is connected to a housing. The lower end of the telescopic connector is inserted into the upper port of the housing, and a pressure-transmitting sleeve is provided below it. An axial flow channel is provided along the axis of the telescopic connector and the pressure-transmitting sleeve. A stationary valve is provided in the inner cavity of the pressure-transmitting sleeve, and a moving valve is provided below the stationary valve. The moving valve is stepped, narrower at the top and wider at the bottom. The upper end of the moving valve is inserted into the lower inner cavity of the pressure-transmitting sleeve, and an annular flow channel is provided between it and the inner wall of the pressure-transmitting sleeve. The lower annular outer step of the moving valve abuts against the lower part of the pressure-transmitting sleeve. A spring is provided at the bottom of the moving valve. Both the moving valve and the spring are mounted on the upper part of the central shaft. A turbine drive mechanism is provided between the outer periphery of the middle section of the central shaft and the inner wall of the housing.

[0009] Furthermore, the turbine drive mechanism includes a turbine stator and a turbine rotor that are matched with each other. The turbine rotor is coaxially mounted on the central shaft, and the turbine stator is mounted on the lower inner wall of the housing.

[0010] Furthermore, the lower end of the spring abuts against the top of the sleeve, and the sleeve is fitted and fixed to the upper outer periphery of the central shaft.

[0011] Furthermore, the top of the turbine rotor abuts against the lower part of the sleeve, and the bottom of the turbine rotor is supported on the lower outer step of the central shaft.

[0012] Furthermore, the lower outer step of the central shaft is supported by the bearing on the lower inner wall of the housing, and the bottom of the outer ring of the bearing is supported on the retaining ring for the bore, which is embedded in the annular groove of the housing.

[0013] Furthermore, the inner cavity of the outer shell is provided with a reduced-diameter inner convex ring in the middle section, and the upper shoulder of the reduced-diameter inner convex ring limits the downward stroke of the moving valve.

[0014] Furthermore, the top of the turbine stator abuts against the lower shoulder of the inner convex ring of the housing with reduced diameter, and the bottom of the turbine stator abuts against the outer ring of the bearing.

[0015] Furthermore, the flow-cutting nozzle is installed at the lower end of the central shaft.

[0016] Furthermore, the static valve has a spline on its outer periphery, which is embedded in the spline groove of the pressure transmission sleeve. The outer periphery of the static valve is fixed to the outer shell by a pin. The static valve remains stationary during operation, while the pressure transmission sleeve can move up and down relative to the static valve.

[0017] Furthermore, the outer periphery of the lower annular outer step of the moving valve is clearance-fitted with the inner wall of the housing, and multiple axial through holes are evenly distributed on the lower annular step of the moving valve, which connect the annular flow channel of the outer periphery of the moving valve and the space below the moving valve.

[0018] Furthermore, the upper circumference of the central shaft is symmetrically provided with a central shaft bypass hole that extends obliquely downward and outward.

[0019] Furthermore, the upper end of the expansion joint is provided with a tapered female thread to connect with the upper drill rod, and the lower end of the outer shell is connected to the drill bit.

[0020] Furthermore, when the downhole pressure is high, the lower end of the expansion joint pushes the moving valve downward a shorter distance through the pressure transmission sleeve, resulting in a smaller gap between the moving valve and the stationary valve; when the downhole pressure is low, the lower end of the expansion joint pushes the moving valve downward a longer distance through the pressure transmission sleeve, resulting in a larger gap between the moving valve and the stationary valve.

[0021] Compared to existing technologies, the advantages or beneficial effects of the embodiments of this application include at least the following: 1. When the drilling fluid in the adjustable hydraulic oscillator sub passes through the expansion joint, different pressure conditions affect the different expansion distances. The expansion joint is connected to the pressure transmission sleeve at the bottom, and the stationary valve is connected to the pressure transmission sleeve through a pin. There is a certain gap between the stationary valve and the moving valve. The oscillation parameters of the hydraulic oscillator can be adjusted downhole according to the transmission of drilling pressure: when the pressure problem is more serious, the expansion distance of the expansion joint is larger, the gap between the stationary valve and the moving valve is smaller, the pressure drop is larger, and the oscillation amplitude is larger; conversely, when the pressure problem is not very serious, the expansion distance of the expansion joint is smaller, the gap between the stationary valve and the moving valve is larger, the pressure drop is smaller, and the oscillation amplitude is smaller.

[0022] 2. Drilling fluid flows into the axial flow channel simultaneously, passing through the central shaft with spring and the sleeve, allowing the oscillating sub to reciprocate. Through the use of expansion joints, static valves, pressure transmission sleeves, and dynamic valves, the adjustable hydraulic oscillating sub has successfully improved its working efficiency under different pressure conditions, extended its service life, and improved its working stability and efficiency.

[0023] 3. This adjustable hydraulic oscillator sub is characterized by convenient operation, strong adaptability, simple structure, and no impact on the drill bit structure, which is of great significance for improving the tool life of hydraulic oscillators. Attached Figure Description

[0024] 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:

[0025] Figure 1 This is a cross-sectional view of the adjustable hydraulic oscillation section of the present invention;

[0026] Figure 2 This is a schematic diagram showing the maximum axial movement distance of the movable valve in the adjustable hydraulic oscillation sub of the present invention.

[0027] Figure 3 This is a schematic diagram of the minimum axial movement distance of the movable valve in the adjustable hydraulic oscillation sub section of the present invention.

[0028] Figure 4 This is a schematic diagram showing the intermediate distance of the axial movement of the movable valve in the adjustable hydraulic oscillation sub section of the present invention.

[0029] Figure 5 for Figure 1 Enlarged view of section I

[0030] Figure 6 for Figure 1 Enlarged view at point II;

[0031] Figure 7 for Figure 1 Enlarged view of section III;

[0032] Figure 8 for Figure 2 Enlarged view of section II;

[0033] Figure 9 for Figure 3 Enlarged view of section II;

[0034] Figure 10 for Figure 4 Enlarged view of section II;

[0035] In the diagram: 101, axial flow channel;

[0036] 1. Expansion joint; 2. Upper joint; 3. Housing; 4. Static valve; 5. Pressure transmission sleeve; 6. Dynamic valve; 7. Spring; 8. Central shaft; 8a. Central shaft bypass hole; 9. Sleeve; 10. Turbine stator; 11. Turbine rotor; 12. Bearing; 13. Hole retaining ring; 14. Cut-off nozzle; 15. Pin. 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 10 As shown, the adjustable hydraulic oscillation sub of this utility model includes a telescopic diversion structure and a turbine drive mechanism. The telescopic diversion structure includes a telescopic joint 1, an upper joint 2, a housing 3, a static valve 4, a pressure transmission sleeve 5, and a dynamic valve 6. The turbine drive mechanism includes a spring 7, a central shaft 8, a sleeve 9, a turbine stator 10, a turbine rotor 11, a bearing 12, a retaining ring for the bore 13, and a flow-cutting nozzle 14.

[0041] The upper end of the expansion joint 1 is provided with a tapered female thread to connect with the drill rod above. The lower end of the expansion joint 1 is connected to the spline groove of the upper joint 2 through a spline. The lower end of the upper joint 2 is connected to the upper end of the outer shell 3 through a thread.

[0042] A pressure-transmitting sleeve 5 is provided below the expansion joint 1, and an axial flow channel 101 is provided along the axis of the expansion joint 1 and the pressure-transmitting sleeve 5. A stationary valve 4 is provided inside the pressure-transmitting sleeve 5. The stationary valve 4 has a spline on its outer periphery and is embedded in the spline groove of the pressure-transmitting sleeve 5 to prevent rotation.

[0043] The outer periphery of the stationary valve 4 is fixed to the outer casing 3 by multiple pins 15, and the outer ends of the pins 15 are screwed into the screw holes of the outer casing 3 for fixation; during operation, the stationary valve 4 remains stationary, while the pressure transmission sleeve 5 can move up and down relative to the stationary valve 4.

[0044] A movable valve 6 is installed below the stationary valve 4. The movable valve 6 is stepped, narrower at the top and wider at the bottom. The upper end of the movable valve 6 is inserted into the lower inner cavity of the pressure transmission sleeve 5, and an annular flow channel is provided between the movable valve 6 and the inner wall of the pressure transmission sleeve 5. The lower annular outer step of the movable valve 6 abuts against the lower part of the pressure transmission sleeve 5, and the outer circumference of the lower annular outer step of the movable valve 6 is clearance-fitted with the outer shell 3, which facilitates the up-and-down movement of the movable valve 6; at the same time, it plays a role in straightening the upper end of the central shaft 8. Multiple axial through holes are evenly distributed on the lower annular step of the movable valve 6, which connect the annular flow channel on the outer circumference of the movable valve 6 and the space below the movable valve 6.

[0045] The inner cavity of the outer shell 3 is provided with a reduced-diameter inner convex ring in the middle section. The upper shoulder of the reduced-diameter inner convex ring limits the downward stroke of the moving valve 6.

[0046] The movement of expansion joint 1 causes a change in the gap between stationary valve 4 and moving valve 6. The drilling fluid flows from upper joint 2 to stationary valve 4, and then flows out through the central hole of stationary valve 4. Part of the fluid flows through moving valve 6 and the annular gap between moving valve 6 and pressure transmission sleeve 5, while the other part flows through the central hole of moving valve 6. The diameter of the central hole of moving valve 6 is smaller than the diameter of the central hole of stationary valve 4.

[0047] The movable valve 6 and spring 7 are mounted on the upper end of the central shaft 8. The upper end of the spring 7 abuts against the lower end face of the movable valve 6, and the lower end of the spring 7 abuts against the top of the sleeve 9. The sleeve 9 is mounted and fixed on the upper outer periphery of the central shaft 8.

[0048] Drilling fluid flows through axial flow channel 101 and the central hole of stationary valve 4 into moving valve 6 for diversion. The pressure change generated as fluid flows out of moving valve 6 causes spring 7 to oscillate elastically, causing moving valve 6 to float up and down, altering the gap between it and stationary valve 4. Furthermore, expansion joint 1 extends and retracts within the spline groove of upper joint 2 via splines, transmitting torque and changing the overall length of the oscillating sub, thus enabling axial reciprocating motion of the oscillating sub.

[0049] The upper circumference of the central shaft 8 is symmetrically provided with a central shaft bypass hole 8a that extends obliquely downward and outward. A portion of the drilling fluid flowing out of the central hole of the driven valve 6 enters the outer circumferential space of the central shaft 8 through the central shaft bypass hole 8a, and then enters the turbine drive mechanism downward.

[0050] In the turbine drive mechanism, the sleeve 9 and the turbine rotor 11 are coaxially mounted on the central shaft 8. The top of the turbine rotor 11 abuts against the bottom of the sleeve 9, and the bottom of the turbine rotor 11 is supported on the lower outer step of the central shaft 8. The lower outer step of the central shaft 8 is supported on the lower inner wall of the housing 3 by the bearing 12. The bottom of the outer ring of the bearing 12 is supported on the retaining ring 13 for the bore, and the retaining ring 13 for the bore is embedded in the annular groove of the housing 3.

[0051] A turbine stator 10 is provided around the outer periphery of the turbine rotor 11. The turbine stator 10 is installed on the lower inner wall of the housing 3. The top of the turbine stator 10 abuts against the lower shoulder of the inner convex ring of the reduced diameter housing 3, and the bottom of the turbine stator 10 abuts against the outer ring of the bearing 12. Drilling fluid flows through the channel between the turbine stator 10 and the turbine rotor 11, causing the tool to generate torque.

[0052] A flow-blocking nozzle 14 is installed at the lower end of the central shaft 8. By replacing the flow-blocking nozzle 14 with different specifications, the flow ratio of the flow through the central channel and the flow through the turbine drive mechanism can be changed, thereby changing the intensity of the hydraulic oscillation.

[0053] The working process of this adjustable hydraulic oscillation sub is as follows:

[0054] When the drilling fluid in the adjustable hydraulic oscillating sub passes through the expansion joint 1, the expansion distance varies depending on the pressure applied. The lower end of the expansion joint 1 rests against the pressure transmission sleeve 5. The stationary valve 4 is connected to the outer casing 3 via pin 15, and there is a certain gap between the stationary valve 4 and the moving valve 6. When water flows from top to bottom, after passing through the stationary valve 4, part of the water flows out from the central hole of the moving valve 6, and the other part flows out from the annular channel between the moving valve 6 and the pressure transmission sleeve 5.

[0055] like Figure 2 As shown, when the downhole pressure is low, the force on the expansion joint 1 is relatively large, causing the expansion joint 1 to push the pressure transmission sleeve 5 and the moving valve 6 downward. The moving valve 6 compresses the spring 7, resulting in a longer axial movement distance, which makes the gap between the moving valve 6 and the stationary valve 4 larger. The water flow in the central channel of the moving valve 4 is less, and the pressure drop is also smaller. Subsequently, the water pressure flowing out of the moving valve 6 drives the spring 7 below to reciprocate in an oscillating motion with a small oscillation amplitude. The water flow then passes through the vortex stator 10 and the vortex rotor 11, causing the short section to produce a hydraulic oscillation effect.

[0056] like Figure 3 As shown, when the downhole pressure is large, the force on the expansion joint 1 is small, which makes the distance that the lower end of the expansion joint 1 pushes the moving valve 6 downward through the pressure transmission sleeve 5 shorter. This makes the gap between the moving valve 6 and the stationary valve 4 smaller, and the water flow through the central channel of the moving valve is larger, resulting in a larger pressure drop and a larger oscillation amplitude.

[0057] The drilling fluid flows simultaneously into the axial flow channel and passes through the central shaft 8 with spring 7 and the sleeve 9, allowing the oscillating sub to reciprocate. Through the use of the expansion joint 1, static valve 4, pressure transmission sleeve 5, and dynamic valve 6, the performance parameters of the hydraulic oscillator can be changed downhole according to the drilling pressure transmission efficiency, thereby improving the application effect of the hydraulic oscillator and extending its service life.

[0058] 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. An adjustable hydraulic oscillation sub, comprising an upper connector (2), characterized in that: The upper connector (2) is fitted with a telescopic connector (1). The lower end of the telescopic connector (1) is fitted with the spline groove of the upper connector (2) via a spline. The lower end of the upper connector (2) is connected to a housing (3). The lower end of the telescopic connector (1) is inserted into the upper port of the housing (3) and a pressure transmission sleeve (5) is provided below it. An axial flow channel (101) is provided along the axis of the telescopic connector (1) and the pressure transmission sleeve (5). A static valve (4) is provided in the inner cavity of the pressure transmission sleeve (5), and a dynamic valve is provided below the static valve (4). (6) The moving valve (6) is stepped with a narrow top and a wide bottom. The upper end of the moving valve (6) is inserted into the lower inner cavity of the pressure transmission sleeve (5) and an annular flow channel is provided between it and the inner wall of the pressure transmission sleeve (5). The lower end of the moving valve (6) has an annular outer step that abuts against the lower part of the pressure transmission sleeve (5). A spring (7) is provided at the bottom of the moving valve (6). The moving valve (6) and the spring (7) are both mounted on the upper part of the central shaft (8). A turbine drive mechanism is provided between the outer periphery of the middle section of the central shaft (8) and the inner wall of the outer shell (3).

2. The adjustable hydraulic oscillator sub according to claim 1, characterized in that: The turbine drive mechanism includes a turbine stator (10) and a turbine rotor (11) that are matched with each other. The turbine rotor (11) is coaxially mounted on the central shaft (8), and the turbine stator (10) is mounted on the lower inner wall of the housing (3).

3. The adjustable hydraulic oscillation sub according to claim 2, characterized in that: The lower end of the spring (7) abuts against the top of the sleeve (9), which is fitted and fixed to the upper outer periphery of the central shaft (8).

4. The adjustable hydraulic oscillation sub according to claim 3, characterized in that: The top of the turbine rotor (11) abuts against the lower part of the sleeve (9), and the bottom of the turbine rotor (11) is supported on the lower outer step of the central shaft (8).

5. The adjustable hydraulic oscillation sub according to claim 4, characterized in that: The lower outer step of the central shaft (8) is supported by a bearing (12) on the lower inner wall of the outer shell (3). The bottom of the outer ring of the bearing (12) is supported on a retaining ring (13) for holes. The retaining ring (13) for holes is embedded in the annular groove of the outer shell (3).

6. The adjustable hydraulic oscillation sub according to claim 5, characterized in that: The inner cavity of the outer shell (3) is provided with a reduced diameter inner convex ring in the middle section, and the upper shoulder of the reduced diameter inner convex ring limits the downward stroke of the moving valve (6).

7. The adjustable hydraulic oscillator sub according to claim 6, characterized in that: The top of the turbine stator (10) abuts against the lower shoulder of the inner convex ring of the reduced diameter housing (3), and the bottom of the turbine stator (10) abuts against the outer ring of the bearing (12).

8. The adjustable hydraulic oscillator sub according to claim 1, characterized in that: A flow-cutting nozzle (14) is installed at the lower end of the central shaft (8).

9. The adjustable hydraulic oscillator sub according to claim 1, characterized in that: The static valve (4) has a spline on its outer periphery and is embedded in the spline groove of the pressure transmission sleeve (5). The outer periphery of the static valve (4) is fixed to the outer shell (3) by a pin (15). The static valve (4) remains stationary during operation, and the pressure transmission sleeve (5) can move up and down relative to the static valve (4).

10. The adjustable hydraulic oscillator sub according to claim 1, characterized in that: The outer periphery of the lower annular outer step of the moving valve (6) is clearance-fitted with the inner wall of the outer shell (3). Multiple axial through holes are evenly distributed on the lower annular step of the moving valve (6), which connect the annular flow channel of the outer periphery of the moving valve (6) and the space below the moving valve (6).

11. The adjustable hydraulic oscillator sub according to claim 1, characterized in that: The upper circumference of the central shaft (8) is symmetrically provided with a central shaft bypass hole (8a) that runs obliquely downward and outward.

12. The adjustable hydraulic oscillation sub according to claim 1, characterized in that: The upper end of the expansion joint (1) is provided with a tapered female thread to connect with the upper drill rod, and the lower end of the outer shell (3) is connected to the drill bit.

13. The adjustable hydraulic oscillating sub according to any one of claims 1 to 12, characterized in that: When the downhole pressure is large, the lower end of the expansion joint (1) pushes the moving valve (6) downward by a shorter distance through the pressure transmission sleeve (5), making the gap between the moving valve (6) and the stationary valve (4) smaller. When the downhole pressure is small, the lower end of the expansion joint (1) pushes the moving valve (6) downward a longer distance through the pressure transmission sleeve (5), making the gap between the moving valve (6) and the stationary valve (4) larger.

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