Well drilling friction and torque suppression system and method utilizing hydrodynamic force suspension

Abstract

The invention discloses a well drilling friction and torque suppression system and method utilizing hydrodynamic force suspension, relates to the technical field of deep well drilling, and is particularly suitable for petroleum, natural gas and geothermal well drilling scenes. In order to solve the technical problems that friction between a drill rod and a hole wall is increased, torque load is concentrated and pressure of a drill bit is too high, the invention provides a technical scheme for driving surface dynamic lift force of the drill rod through fluid circulation. The system comprises a power driving unit, a fluid circulating unit, a suspension control unit and a monitoring unit, the suspension control unit comprises a fluid power blade set installed on the drill rod, lifting force is generated on the surfaces of blades through directional water flow, the drill rod is in a suspension state between hole walls, and therefore mechanical contact friction and local torque concentration are reduced. The monitoring unit collects the torque, axial tension and fluid parameters of the drill rod in real time, and power output is optimized through closed-loop control. The method can be extensively applied to deep sea exploration, hard rock drilling and other scenes, and has the remarkable advantages that equipment loss is reduced, and drilling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a drilling friction and torque suppression system and method, belonging to the technical field of oil drilling. Background Art

[0002] In the field of oil drilling, with the continuous increase of exploration depth, traditional drilling technologies face many challenges. Especially during deep well drilling, the friction between the drill pipe and the hole wall increases sharply, often exceeding the maximum torque limit of the drilling platform, resulting in low drilling efficiency or even operation failure. At the same time, when the drill bit works at extreme depths, the contact pressure is extremely easy to exceed the material bearing limit, restricting the large horizontal and vertical depths of drilling. Existing solutions mostly rely on enhancing the power output of the drilling platform or improving the drill pipe material, but this not only increases costs but also may cause new technical problems, such as drill pipe fracture and increased equipment wear.

[0003] The invention patent with publication number EP3279426A1 and application date August 5, 2016 discloses a method and system component for suppressing torsional vibration in drilling, including arranging at least one stabilizer around the downhole drill string section through a friction coupler, and the friction coupler generates increased torque in response to an increase in the rotational speed of the downhole drill string section; however, this technical solution does not reduce the friction between the drill pipe and the hole wall.

[0004] Therefore, it is particularly important to develop a new drilling technology that can effectively reduce the friction between the drill pipe and the hole wall and evenly distribute the torque load. Summary of the Invention

[0005] In order to solve the problems of increased friction between the drill pipe and the hole wall, concentrated torque load, and excessive drill pressure of the drill bit during deep well drilling, the present invention further provides a drilling friction and torque suppression system and method using hydrodynamic suspension.

[0006] The technical solution adopted by the present invention to solve the above problems is: the present invention includes a power drive unit, a fluid circulation unit, a suspension control unit, and a monitoring unit;

[0007] Power drive unit: used to provide the rotational power of the drill pipe;

[0008] Fluid circulation unit: includes a circulation pipeline and a pressure regulating device, used to generate a directional water flow;

[0009] Suspension control unit: includes at least one group of hydrodynamic blades installed on the surface of the drill pipe, and the hydrodynamic blades generate dynamic lift through water flow power;

[0010] Monitoring unit: collects the drill pipe torque, axial tension, and water flow parameters in real time and feeds them back to the power drive unit.

[0011] Further, the power drive unit includes a servo motor; the motor shaft of the servo motor is connected to the upper end of the drill pipe.

[0012] Further, the circulation pipeline of the fluid circulation unit includes a hydrofoil test chamber, a water outlet pipe, a water inlet pipe, and a water storage bucket, and the pressure regulating device of the fluid circulation unit is a water pump;

[0013] The water outlet of the hydrofoil test chamber is connected to the inlet of the water storage bucket through the water outlet pipe, the water inlet of the hydrofoil test chamber is connected to the outlet of the water pump, and the inlet of the water pump is connected to the outlet of the water storage bucket through the water inlet pipe.

[0014] Further, the fluid circulation unit further includes a bearing support seat and a water outlet flange;

[0015] The water outlet flange is arranged at the bottom inside the hydrofoil test chamber, and the water outlet flange is communicated with the water inlet of the hydrofoil test chamber, and the bearing support seat is installed on the water outlet flange.

[0016] Further, the suspension control unit includes at least one set of fluid dynamic blades; the fluid dynamic blades are composed of hydrofoil blades and blade adjusting devices; multiple rows of blade fixing seats are arranged along the axial direction on the outer surface of the blade adjusting device, each row of blade fixing seats is composed of multiple blade fixing seats, and the root of the hydrofoil blade is connected inside the corresponding blade fixing seat through a spline.

[0017] Further, the monitoring unit includes a torque sensor, four tension sensors, a mounting plate, and a hollow turntable;

[0018] The mounting plate is fixed on the top of the frame, the four tension sensors are installed on the mounting plate, the four mounting holes on the hollow turntable respectively correspond to the four tension sensors, the upper end of the drill pipe is fixed on the central rotating disk of the hollow turntable, the motor shaft of the servo motor is connected to the torque sensor through a coupling, and the drive shaft of the torque sensor is connected to the speed regulator of the hollow turntable.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention reduces the friction and torque requirements; through the hydrofoil suspension technology, the direct contact area between the drill pipe and the hole wall can be reduced, thereby reducing the frictional resistance, so that it is possible to drill to a deeper level without increasing the maximum torque output of the drilling platform;

[0021] 2. The present invention evenly distributes the torque: the hydrofoil uses the auxiliary torque generated by the water flow power to achieve the uniform distribution of the torque along the length of the drill pipe, avoiding the risk of drill pipe damage caused by torque concentration, and extending the service life of the drill pipe;

[0022] 3. The present invention improves the drilling efficiency and safety: reduces equipment failures caused by friction and excessive pressure, improves the continuity and success rate of drilling operations, and reduces the operation cost at the same time;

[0023] 4. The present invention adds hydrofoil blades at the drill pipe outlet, utilizes the extremely high water flow velocity of the return water to provide positive torque and lift to the drill bit, measures the torque force and lift of hydrofoil blades at different angles for subsequent optimization design, and is provided with a pressure-reducing return water device, so that water resources can be recycled under safe conditions to avoid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a schematic diagram of the water flow process of the present invention;

[0026] Figure 3 is a schematic diagram of the liquid level position in the present invention;

[0027] Figure 4 is a schematic diagram of the structure of the drill pipe assembly;

[0028] Figure 5 is a schematic diagram of the structure of the sensor assembly;

[0029] Figure 6 is a schematic diagram of the structure of the blade adjusting device;

[0030] Figure 7 is a graph of the working condition data with a simulated inlet water flow velocity of 1.5 m / s in the vertical section, the drill pipe rotating clockwise at a speed of 100 rpm;

[0031] Figure 8 is a simulated contour map with a simulated inlet water flow velocity of 1.5 m / s in the vertical section, the drill pipe rotating clockwise at a speed of 100 rpm;

[0032] Figure 9 is a graph of the working condition data with a simulated inlet water flow velocity of 1.5 m / s in the vertical section, the drill pipe stationary;

[0033] Figure 10 is a simulated contour map with a simulated inlet water flow velocity of 1.5 m / s in the vertical section, the drill pipe stationary;

[0034] Figure 11 is a graph of the working condition data with a simulated inlet water flow velocity of 1.5 m / s in the vertical section, the drill pipe rotating counterclockwise at a speed of 100 rpm;

[0035] Figure 12 is a simulated contour map with a simulated inlet water flow velocity of 1.5 m / s in the vertical section, the drill pipe rotating counterclockwise at a speed of 100 rpm;

[0036] Figure 13 is a graph of the working condition data with a simulated inlet water flow velocity of 2 m / s in the vertical section, the drill pipe rotating clockwise at a speed of 100 rpm;

[0037] Figure 14 It is the simulation nephogram of the vertical section with an inlet water flow velocity of 2 m / s and the drill pipe rotating clockwise at a speed of 100 rpm;

[0038] Figure 15 It is the data diagram of the vertical section with an inlet water flow velocity of 2 m / s and the drill pipe in a stationary condition;

[0039] Figure 16 It is the simulation nephogram of the vertical section with an inlet water flow velocity of 2 m / s and the drill pipe in a stationary condition;

[0040] Figure 17 It is the data diagram of the vertical section with an inlet water flow velocity of 2 m / s and the drill pipe rotating counterclockwise at a speed of 100 rpm;

[0041] Figure 18 It is the simulation nephogram of the vertical section with an inlet water flow velocity of 2 m / s and the drill pipe rotating counterclockwise at a speed of 100 rpm;

[0042] Figures 1 to 6 Among them, 1 - servo motor, 2 - hydrofoil test chamber, 3 - outlet pipe, 4 - inlet pipe, 5 - water pump, 6 - water storage bucket, 7 - frame, 8 - drill pipe, 9 - flow deflector, 10 - upper hydrofoil blade assembly, 11 - lower hydrofoil blade assembly, 12 - bearing support, 13 - outlet flange, 14 - torque sensor, 15 - tension sensor, 16 - mounting plate, 17 - hydrofoil blade, 18 - blade adjusting device, 1801 - blade fixing seat. Specific implementation manner

[0043] Specific implementation manner one: As Figures 1 to 6 shown, a drilling friction and torque suppression system using hydrodynamic suspension includes a power drive unit, a fluid circulation unit, a suspension control unit, and a monitoring unit;

[0044] Power drive unit: Used to provide the rotational power for the drill pipe;

[0045] Fluid circulation unit: Includes a circulation pipeline and a pressure regulating device, used to generate a directional water flow;

[0046] Suspension control unit: Comprises at least one set of hydrodynamic blades installed on the surface of the drill pipe, and the hydrodynamic blades generate dynamic lift through water flow power;

[0047] Monitoring unit: Real - time collects the torque, axial tension of the drill pipe, and water flow parameters and feeds them back to the power drive unit.

[0048] Among them, the power drive unit includes a servo motor 1; the motor shaft of the servo motor 1 is connected to the upper end of the drill pipe 8;

[0049] The circulation pipeline of the fluid circulation unit includes a hydrofoil test chamber 2, a water outlet pipeline 3, a water inlet pipeline 4, and a water storage bucket 6. The pressure regulating device of the fluid circulation unit is a water pump 5;

[0050] The water outlet of the hydrofoil test chamber 2 is connected to the inlet of the water storage bucket 6 through the water outlet pipeline 3. The water inlet of the hydrofoil test chamber 2 is connected to the outlet of the water pump 5. The inlet of the water pump 5 is connected to the outlet of the water storage bucket 6 through the water inlet pipeline 4;

[0051] The fluid circulation unit further includes a bearing support 12 and a water outlet flange 13;

[0052] The water outlet flange 13 is arranged at the bottom inside the hydrofoil test chamber 2, and the water outlet flange 13 is communicated with the water inlet of the hydrofoil test chamber 2. The bearing support 12 is installed on the water outlet flange 13.

[0053] The suspension control unit includes at least one set of hydrodynamic blades. The hydrodynamic blades are composed of a hydrofoil blade 17 and a blade adjusting device 18. The outer surface of the blade adjusting device 18 is axially provided with multiple rows of blade fixing seats. Each row of blade fixing seats is composed of multiple blade fixing seats 1801. The root of the hydrofoil blade 17 is connected to the corresponding blade fixing seat 1801 through a spline.

[0054] In the blade adjusting device 18, the hydrofoil blade 17 is installed on a spline sleeve through a D-shaped hole. The spline shaft and the spline sleeve are in spline fit. After the countersunk screw passes through the clamping plate, the hydrofoil blade 17, and the spline shaft, it is fixed in the blade fixing seat 18. The spline sleeve and the blade fixing seat 18 are limited by two planes, thereby restricting the rotation of the hydrofoil blade 17.

[0055] When adjusting the angle of the hydrofoil blade 17, after opening the threaded cover and taking out the flow guiding block, the angle adjustment work of the hydrofoil blade 17 can be carried out. Using the corner characteristics of the spline, the micro-angle of the hydrofoil blade 17 is accurately adjusted. Then, by rotating the pipeline, each hydrofoil blade 17 is adjusted, and repeated experiments are carried out to strive for the best state. For the detection of the performance of hydrofoils in different orientations, three rows of blade fixing seats 1801 with different orientations are set. The first row can be optimized at an angle of 15° to the left, the second row is parallel to the pipeline axis, and the third row can be optimized at an angle of 15° to the right, which can make the adjustment range larger. The flow guiding block is mainly responsible for ensuring that the water flow has no influence when flowing through the adjustment port, while the threaded cover is responsible for sealing the adjustment hole. Between the flow guiding block and the experimental pipeline, there is a clamping block for limiting to prevent it from being sucked into the experimental pipeline when the water flow velocity is relatively high.

[0056] The monitoring unit includes a torque sensor 14, four tension sensors 15, a mounting plate 16, and a hollow turntable;

[0057] The mounting plate 16 is fixed to the top of the frame 7. Four tension sensors 15 are mounted on the mounting plate 16. The four mounting holes on the hollow turntable respectively correspond to the four tension sensors 15. The upper end of the drill pipe 8 is fixed to the central rotating disc of the hollow turntable. The motor shaft of the servo motor 1 is connected to the torque sensor 14 through a coupling. The drive shaft of the torque sensor 14 is connected to the speed regulator of the hollow turntable.

[0058] Since the flow rate of the water flow is relatively fast, a flow deflector 9 is provided above the drill pipe 8. The flow deflector 9 has a certain inclination angle, which can deflect the water flow to reduce the impact force generated by the water flow. The inclination angle of the flow deflector 9 directly determines the stability of the water flow laminar flow.

[0059] Specific embodiment two: As Figure 1 shown, on the basis of specific embodiment one, solenoid valves are respectively installed on the water outlet pipe 3 and the water inlet pipe 4 to control the water flow direction in the hydrofoil test chamber 2 through the solenoid valves.

[0060] Specific embodiment three: As Figure 1 shown, on the basis of specific embodiment one, a set of hydrodynamic blades are respectively installed on the upper and lower parts of the drill pipe 8 to achieve the series connection of multiple stages of blades on the drill pipe 8.

[0061] Among them, the hydrofoil blades 17 in the hydrodynamic blades are made of titanium alloy or carbon fiber composite material.

[0062] Working principle

[0063] As Figure 1 and Figure 2 shown, during the experiment, the water pump 5 is started. The water flow enters from the inlet of the water pump 5 and then flows out from the outlet of the water pump 5. After being decompressed, it smoothly enters the hydrofoil test chamber 2. After the water flow fills the hydrofoil test chamber 2, it then flows back to the water storage bucket 6 through the water outlet pipe 3.

[0064] As Figure 3 shown, before the equipment is used and after it stops being used, the water level is below the 2nd blade adjustment port. Open the threaded cover on the adjustment port, and then the angle adjustment work of the hydrofoil blade 17 can be carried out.

[0065] As Figure 4 shown, when the water flow flows out from the outlet of the water pump 5, it is shunted to the periphery of the experimental pipeline by the conical surface above when it contacts the bearing support seat 12. Since the bearing support seat 12 is fixedly connected to the water outlet flange 13, the impact force of the water flow will not directly impact on the drill pipe 8 at this moment. When the water flow flows through the bearing support seat 12, it successively flows through two layers of hydrofoil blades 17, and then rushes out of the experimental pipeline and enters the water storage bucket 6.

[0066] In the present invention, hydrofoils are installed on the drill pipe. By utilizing the dynamic lift generated by the velocity of the recirculating water, the drill pipe can achieve a suspended state between the hole walls, thereby significantly reducing the direct friction between the drill pipe and the hole walls and alleviating the drilling pressure on the drill bit. In addition, the hydrofoils of the present invention incorporate the principle of hydrodynamics and can generate an auxiliary torque under the action of water flow. This torque is evenly distributed along the axial direction of the drill pipe, effectively dispersing the concentrated input of the power torque of a single drilling rig, reducing the high requirements for the wall thickness of the drill pipe, and improving the stability and safety of the drilling operation.

[0067] As Figures 7 to 18 shown,

[0068] The suspended responses of the vertical hydrofoils with inlet velocities of 1.5 m / s and 2 m / s in the pipe under the clockwise rotation, stationary, and counterclockwise rotation conditions are respectively completed. Sufficient lift can be generated under all three conditions. Under the stationary condition, the pressure of the fluid generates a driving torque on the hydrofoil. Therefore, when the drill pipe rotates clockwise at the rated speed (100 rpm), its driving torque is less than that under the static load condition, mainly because the presence of the hydrofoil provides an additional driving torque. However, when the drill pipe rotates counterclockwise, the additional torque of the hydrofoil under the action of the inlet flow velocity turns into a resistance torque, resulting in a significant increase in the driving torque (as shown in Table 1). In summary, under the clockwise condition, the vertical hydrofoil can provide a certain lift and additional driving torque, enabling the composite drill pipe structure to have sufficiently stable suspension characteristics and driving characteristics.

[0069] Table 1 Suspension characteristics of the hydrofoil in the vertical section

[0070]

[0071] The above description is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the relevant art can make some modifications or decorations to equivalent variations within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention and is based on the technical essence of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims

1. A drilling friction and torque suppression system using hydrodynamic suspension, characterized in that, It includes a power drive unit, a fluid circulation unit, a suspension control unit and a monitoring unit; Power drive unit: used to provide the rotational power of the drill pipe; Fluid circulation unit: includes a circulation pipeline and a pressure regulating device, used to generate a directional water flow; Suspension control unit: contains at least one set of hydrodynamic blades installed on the surface of the drill pipe, and the hydrodynamic blades generate dynamic lift through water flow power; Monitoring unit: collects the drill pipe torque, axial tension and water flow parameters in real time and feeds them back to the power drive unit.

2. The drilling friction and torque suppression system using hydrodynamic suspension according to claim 1, characterized in that, The power drive unit includes a servo motor (1); the motor shaft of the servo motor (1) is connected to the upper end of the drill pipe (8).

3. A drilling friction and torque suppression system using hydrodynamic suspension according to claim 1, wherein, The circulation pipeline of the fluid circulation unit includes a hydrofoil test chamber (2), an outlet pipeline (3), an inlet pipeline (4) and a water storage bucket (6), and the pressure regulating device of the fluid circulation unit is a water pump (5); The outlet of the hydrofoil test chamber (2) is connected to the inlet of the water storage bucket (6) through the outlet pipeline (3), the inlet of the hydrofoil test chamber (2) is connected to the outlet of the water pump (5), and the inlet of the water pump (5) is connected to the outlet of the water storage bucket (6) through the inlet pipeline (4).

4. A drilling friction and torque suppression system using hydrodynamic suspension according to claim 1, characterized in that, The fluid circulation unit further includes a bearing support seat (12) and an outlet flange (13); The outlet flange (13) is arranged at the bottom inside the hydrofoil test chamber (2), and the outlet flange (13) is communicated with the inlet of the hydrofoil test chamber (2), and the bearing support seat (12) is installed on the outlet flange (13).

5. A drilling friction and torque suppression system using hydrodynamic suspension according to claim 1, characterized in that, The suspension control unit includes at least one set of hydrodynamic blades; the hydrodynamic blades are composed of hydrofoil blades (17) and a blade adjusting device (18); multiple rows of blade fixing seats are arranged axially on the outer surface of the blade adjusting device (18), and each row of blade fixing seats is composed of multiple blade fixing seats (1801), and the root of the hydrofoil blade (17) is connected to the corresponding blade fixing seat (1801) through a spline.

6. A drilling friction and torque suppression system using hydrodynamic suspension according to claim 1, wherein The monitoring unit includes a torque sensor (14), four tension sensors (15), a mounting plate (16) and a hollow turntable; The mounting plate (16) is fixed to the top of the frame (7), the four tension sensors (15) are installed on the mounting plate (16), the four mounting holes on the hollow turntable respectively correspond to the four tension sensors (15), the upper end of the drill pipe (8) is fixed to the central rotating disc of the hollow turntable, the motor shaft of the servo motor (1) is connected to the torque sensor (14) through a coupling, and the drive shaft of the torque sensor (14) is connected to the speed regulator of the hollow turntable.

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