Static push-the-bit rotary steerable tool fatigue test bench

Abstract

The application is suitable for the oil and gas drilling technology field, and provides a static push type rotary steering tool fatigue test bench, which comprises a fixed support, a fixed platform and a working platform; the fixed platform comprises a horizontal fixed support, a vertical fixed support, a steel cable, a motor, a fixed winch, a positioning bolt and a fixed pulley; the working platform comprises a power section, an execution section and a resistance section, and the power section, the execution section and the resistance section are connected to the working platform through the fixed support. The application has the advantages of simple structure and easy operation; can simulate the complex working environment of the static push type rotary steering bottom hole assembly, and considers the influence of the drilling fluid flow, the application of the guiding force and the drill bit-rock interaction on the fatigue life of the bottom hole assembly; can simulate the multi-axial fatigue damage mode of the bottom hole assembly under external load; can perform the fatigue life experiment on the overall structure or a certain part of the rotary steering bottom hole assembly, and can also apply random external load to the experimental object.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas drilling technology, and particularly relates to a static push-type rotary guide tool fatigue test bench. Background Technology

[0002] In the field of oil and gas drilling, challenges such as deep formations, complex geological structures, and low efficiency are encountered. In the development of horizontal wells, extended reach wells, or highly deviated wells, directional drilling technology is a key means of developing these oil and gas resources. Rotary steerable drilling technology can effectively solve technical problems such as high friction, low drilling speed, sticking, and uneven wellbore during sliding directional drilling. However, the stress conditions of the rotary steerable bottomspin assembly downhole are extremely complex, thus placing extremely high demands on the assembly's vibration and shock resistance, reliability, and stability, requiring improvements to these properties. These performance improvements need to be analyzed from the perspectives of drill string dynamics and other theoretical and experimental approaches.

[0003] In recent years, the impact of drilling fluid on downhole drill string dynamics has attracted great attention from researchers. Static push-type rotary steered bottom drill string assemblies are often in a high-temperature and high-pressure state, and due to the interaction between the drill bit and the rock, they will cause severe vibration, which will shorten the service life of the bottom drill string assembly.

[0004] Full-scale experiments are costly and difficult to implement; therefore, laboratory model experiments are typically used to simulate actual working environments. Current laboratory fatigue life tests on drill string assemblies mainly focus on single-type fatigue failure modes (such as torsional fatigue and flexural-torsional fatigue), and usually only consider the material properties of a specific part. However, in actual operation, drill string assemblies are subjected to a variety of complex external loads, including bottom drilling pressure, contact force between the drill bit and the wellbore, and drill bit torque. These loads vary considerably and are highly random. Moreover, existing experimental setups can usually only apply fixed external loads, which limits the realism and accuracy of the experiments. To study the effects of drilling fluid flow, drill bit-rock interaction, and radial guiding force on static push-type rotary steered bottom drill string assemblies or drive shafts, and to evaluate the fatigue life of downhole drilling tools, this invention proposes a fatigue test bench for static push-type rotary steered tools. Summary of the Invention

[0005] The purpose of this invention is to provide a static push-type rotary guide tool fatigue testing bench, which aims to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A static push-type rotary guide tool fatigue testing bench includes a fixed support, characterized in that it further includes a fixed platform and a working platform;

[0008] The fixed platform includes a horizontal fixed support, a vertical fixed support, a steel cable, a motor, a fixed winch, positioning bolts, and fixed pulleys; the horizontal and vertical fixed supports are fixedly connected; the motor is connected to the fixed winch via a transmission device, and the motor drives the fixed winch to rotate; the fixed pulleys are installed at the top and bottom of the vertical fixed support; one end of the steel cable is wound around the roller of the fixed winch, and the other end passes over the fixed pulley and is connected to the working platform; the working platform is connected to the fixed platform via positioning bolts.

[0009] The working platform includes a power section, an execution section, and a resistance section, all of which are connected to the working platform by fixed supports.

[0010] The power section includes a storage tank, a delivery pipeline, a water pump, a flow meter, an encoder, a thrust bearing, a pressure sensor, a servo motor, a phase sensor, gears, and a drive shaft. The flow meter, phase sensor, gears, pressure sensor, and thrust bearing are connected to the drive shaft from left to right. The output end of the servo motor is equipped with a gear, which meshes with the gear on the drive shaft. The water pump is connected to the storage tank and the flow meter via the delivery pipeline. The encoder is connected to the servo motor and is used to measure the angular velocity of the rotating experimental shaft.

[0011] The execution section includes an experimental shaft, an acrylic housing, a stabilizer, a thin-walled bearing, a sealed sliding bearing, a tension sensor, an electric push-pull rod, a steel wire, a perforated rubber sealing cap, and a wireless integrated strain gauge. The experimental shaft is equipped with a stabilizer and has an opening at its bottom. The acrylic housing is fixed to the work platform by a fixed support. Wireless integrated strain gauges are evenly spaced on the outer surface of the experimental shaft for collecting corresponding strain data. The tension sensor is fixed to a slide rail. One end of the steel wire is connected to the bottom of the thin-walled bearing, and the other end is connected to the electric push-pull rod via the tension sensor.

[0012] The resistance section includes a magnetic powder brake, a drill bit, a rock, a slide rail support, a resistance shaft, a vibrator, a torque sensor, and a coupling; the magnetic powder brake and the rock are both connected to the slide rail support; the resistance shaft passes through the magnetic powder brake and the torque sensor in sequence and connects the drill bit and the rock through the coupling, and the tail of the rock is connected to the vibrator.

[0013] Furthermore, the fixed support includes an upper fixed support and a lower fixed support; the upper fixed support and the lower fixed support, as well as the lower fixed support and the working platform, are all connected by bolts.

[0014] Furthermore, both sides of the work platform are provided with elongated bolt slots, and the lower fixed support is connected to the elongated bolt slots of the work platform by bolts.

[0015] Furthermore, the drive shaft and the experimental shaft have different inner and outer diameters.

[0016] Furthermore, an annular gap is formed between the plexiglass shell and the experimental shaft.

[0017] Furthermore, the resistance shaft is a solid shaft.

[0018] Furthermore, the fixed platform also includes support ribs, and the horizontal fixed bracket and the vertical fixed bracket are connected by bolts and reinforced by the support ribs.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention proposes a static push-type rotary guide tool fatigue testing bench, which has a simple structure and is easy to operate.

[0021] 2. This invention can simulate the complex working environment of a static push-type rotary steerable bottom drill string assembly, and considers the effects of drilling fluid flow, applied guiding force, and drill bit-rock interaction on the fatigue life of the static push-type rotary steerable bottom drill string assembly. Furthermore, it can simulate the multi-axis fatigue failure mode of the bottom drill string assembly under external loads. This invention can conduct fatigue life tests on the overall structure of the rotary steerable bottom drill string assembly or a specific component (such as the test shaft), and can also apply random external loads (such as drilling pressure and drill bit torque) to the test object.

[0022] 3. This invention can effectively control the flow of circulating drilling fluid by adjusting the inlet flow rate and outlet pressure, ensuring the high reliability of the system.

[0023] 4. This invention uses real drill bits and rocks to simulate the interaction between static push-type rotary steerable drill bits and rocks.

[0024] 5. This invention can adjust the angle of the working platform by using a motor-driven steel cable to lift it, so as to meet different drilling inclination angle requirements. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 This is a schematic diagram of the power section structure in this invention.

[0027] Figure 3 This is a schematic diagram of the structure in this invention where the drill bit-rock interaction is the resistance of a real drill bit-rock interaction.

[0028] Figure 4 This is a schematic diagram of the resistance section structure in this invention, where the drill bit-rock interaction is the external input signal.

[0029] Figure 5 This is a cross-sectional schematic diagram of the experimental shaft in this invention.

[0030] Figure 6 This is a schematic diagram of the fixed platform in this invention.

[0031] In the diagram: 1-Horizontal fixed support; 2-Vertical fixed support; 3-Steel cable; 4-Motor; 5-Fixed winch; 6-Positioning bolt; 7-Fixed pulley; 8-Liquid storage tank; 9-Infusion pipeline; 10-Water pump; 11-Flow meter; 12-Thrust bearing; 13-Pressure sensor; 14-Working platform; 15-Lower fixed support; 16-Upper fixed support; 17-Servo motor; 18-Phase sensor; 19-Gear; 20-Drive shaft; 21-Experimental shaft; 22 - Acrylic glass housing; 23- Stabilizer; 24- Thin-walled bearing; 25- Sealed sliding bearing; 26- Opening; 27- Tension sensor; 28- Electric push-pull rod; 29- Magnetic powder brake; 30- Drill bit; 31- Rock; 32- Slide rail support; 33- Encoder; 34- Steel wire; 35- Perforated rubber sealing cap; 36- Resistance shaft; 37- Vibrator; 38- Torque sensor; 39- Coupling; 40- Wireless integrated strain gauge; 41- Support rib. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0034] like Figure 1-6 As shown, a static push-type rotary guide tool fatigue testing bench provided in an embodiment of the present invention includes a fixed platform, a working platform 14 and a fixed support;

[0035] The fixed support includes an upper fixed support 16 and a lower fixed support 15; the upper fixed support 16 and the lower fixed support 15, and the lower fixed support 15 and the working platform are all connected by bolts.

[0036] The working platform 14 has elongated bolt slots on both sides. The lower fixed support 15 is connected to the elongated bolt slots of the working platform by bolts, which allows for flexible removal, installation, and movement of related components.

[0037] like Figure 1 and Figure 6As shown, in a preferred embodiment of the present invention, the fixed platform includes a horizontal fixed bracket 1, a vertical fixed bracket 2, a steel cable 3, a motor 4, a fixed winch 5, positioning bolts 6, fixed pulleys 7, and support ribs 41. The horizontal fixed bracket 1 and the vertical fixed bracket 2 are connected by bolts and reinforced by support ribs 41. The motor 4 is connected to the fixed winch 5 through a transmission device (such as a transmission gear), and the motor 4 is used to drive the fixed winch 5 to rotate. The fixed pulleys 7 are installed at the top and bottom of the vertical fixed bracket 2. One end of the steel cable 3 is wound around the roller of the fixed winch 5, and the other end passes over the fixed pulleys 7 and is connected to the working platform 14. The working platform 14 is connected to the fixed platform by positioning bolts 6. Both the horizontal fixed bracket 1 and the vertical fixed bracket 2 are provided with sliding grooves. The two ends of the working platform 14 are slidably connected to the sliding grooves of the horizontal fixed bracket 1 and the vertical fixed bracket 2, respectively. After the position of the working platform 14 is adjusted, the positioning bolts 6 fix the working platform 14 to the fixed platform.

[0038] In this embodiment of the invention, the steel cable 3 is connected to the working platform 14 by passing around the fixed pulleys 7 at the bottom and top of the vertical fixed bracket 2. The fixed winch 5 is driven by the motor 4 to rotate around its own roller to tighten or loosen the steel cable 3, thereby adjusting the position of the working platform 14. When the end of the working platform 14 connected to the steel cable 3 reaches the predetermined height, the working platform 14 is fixed to the fixed platform by the positioning bolt 6, thereby completing the adjustment of the working inclination angle of the working platform 14 to simulate different well inclination angles.

[0039] like Figure 1-5 As shown, in a preferred embodiment of the present invention, the working platform 14 includes a power section, an execution section and a resistance section, all of which are connected to the working platform 14 by fixed supports.

[0040] The power section includes a storage tank 8, a delivery pipeline 9, a water pump 10, a flow meter 11, a thrust bearing 12, a pressure sensor 13, a servo motor 17, a phase sensor 18, an encoder 33, a gear 19, and a drive shaft 20. The flow meter 11, phase sensor 18, gear 19, pressure sensor 13, and thrust bearing 12 are connected to the drive shaft 20 from left to right. The output end of the servo motor 17 is equipped with a gear 19, which meshes with the gear 19 on the drive shaft 20. The water pump 10 is connected to the storage tank 8 and the flow meter 11 through the delivery pipeline 9. The encoder 33 is connected to the servo motor 17 and is used to measure the angular velocity of the rotating experimental shaft 21.

[0041] The execution section includes an experimental shaft 21, an acrylic housing 22, a stabilizer 23, a thin-walled bearing 24, a sealed sliding bearing 25, a tension sensor 27, an electric push-pull rod 28, a steel wire 34, a perforated rubber sealing cap 35, and a wireless integrated strain gauge 40. The experimental shaft 21 is equipped with a stabilizer 23, and an opening 26 at its bottom facilitates drilling fluid flow. The acrylic housing 22 is fixed to the working platform 14 by a fixed support and does not rotate with the experimental shaft 21. An annular gap is formed between the acrylic housing 22 and the experimental shaft 21, through which the drilling fluid circulates. Wireless integrated strain gauges 40 are evenly spaced on the outer surface of the experimental shaft 21 to collect corresponding strain data. The tension sensor 27 is fixed to a slide rail. One end of the steel wire 34 is connected to the bottom of the thin-walled bearing 24, and the other end is connected to the electric push-pull rod 28 via the tension sensor 27, thus forming a structure to apply radial guiding force to the experimental shaft 21.

[0042] The resistance section includes a magnetic powder brake 29, a drill bit 30, a rock 31, a slide rail support 32, a resistance shaft 36, a vibrator 37, a torque sensor 38, and a coupling 39; the magnetic powder brake 29 and the rock 31 are both connected to the slide rail support 32; the resistance shaft 36 passes through the magnetic powder brake 29 and the torque sensor 38 in sequence and connects the drill bit 30 and the rock 31 through the coupling 39, and the tail of the rock 31 is connected to the vibrator 37.

[0043] In this embodiment of the invention, the phase sensor 18 can measure the number of rotations via the keyway on the experimental shaft 21. The drive shaft 20 and the experimental shaft 21 have different inner and outer diameters to transmit the torque provided by the servo motor 17. The opening 26 is a circumferentially uniformly distributed radial channel hole. The resistance shaft 36 is a solid shaft.

[0044] The interaction between the drill bit and the rock is simulated by using a real drill bit 30 and the rock 31 or by inputting external operating condition signals.

[0045] When simulating the downhole drill bit-rock interaction using a real drill bit 30 and rock 31, the input current of the magnetic powder brake 29 is adjusted to compensate for the torque between the drill bit 30 and rock 31. The vibrator 37 is used to apply axial drilling pressure to the rotating experimental shaft 21. Corresponding operating condition signals can be obtained using the real drill bit 30 and rock 31.

[0046] When simulating the interaction between the drill bit and rock by inputting external working condition signals, the drill bit 30 and the rock 31 can be removed. The magnetic powder brake 29 applies a corresponding torque to the resistance shaft 36 by the input working signal, and at the same time outputs a corresponding axial pressure to the vibrator 37 to apply drilling pressure to the rotating experimental shaft 21 by the input working signal.

[0047] During operation, drilling fluid flows into the storage tank 8 and the water pump 10 from the drive shaft 20, passes through the experimental shaft 21, the opening 26, the annular gap between the plexiglass shell 22 and the experimental shaft 21, and flows out from the perforated sealing rubber cover 35. It then returns to the storage tank 8 through the fluid delivery pipe 9, completing the circulation of the drilling fluid. The servo motor 17 is connected to the drive shaft 20 through two meshing gears 19, and is used to drive the experimental shaft 21 to rotate around its own axis. The magnetic powder brake 29 applies circumferential rotational resistance to the rotating experimental shaft 21, and the vibrator 37 applies axial load to the rotating experimental shaft 21. A small hole in the plexiglass shell 22 allows a steel wire 34 to pass through, with one end of the steel wire 34 connected to the bottom of the thin-walled bearing 24 and the other end connected to the electric push-pull rod 28 through the tension sensor 27, thus forming a structure to apply radial guiding force to the experimental shaft 21.

[0048] The working principle of this invention is:

[0049] In operation, the static push-type rotary guide tool fatigue testing rig first assembles the required components on the working platform 14. Next, the working platform 14 is lifted to a predetermined position by a winch 5 driven by a motor 4 and secured by positioning bolts 6. Then, a servo motor 17 transmits angular velocity to the drive shaft 20 via gear 19, thereby driving the experimental shaft 21 to rotate. Drilling fluid is transferred to the experimental shaft 21 via a water pump 10, infusion pipe 9, flow meter 11, and storage tank 8, circulating and returning to the storage tank 8. The input signal of the magnetic powder brake 29 is adjusted to apply a corresponding resistance torque to the rotating experimental shaft 21. The vibrator 37 applies a corresponding axial pressure to the rotating experimental shaft 21 according to the input signal. Finally, experimental data from relevant sensors such as the phase sensor 18, wireless integrated strain gauge 41, and encoder 33 are read, allowing the acquisition of relevant fatigue fracture mechanisms and the establishment of a life prediction model from the experimental data.

[0050] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A static push-the-bit rotary steerable tool fatigue test bench comprising a stationary support, characterized in that, The fixed platform and the working platform are further included; The fixed platform comprises horizontal fixed supports, vertical fixed supports, a steel cable, a motor, a fixed winch, positioning bolts and a fixed pulley; the horizontal fixed supports and the vertical fixed supports are fixedly connected; the motor is connected with the fixed winch through a transmission device, and the motor is used to drive the fixed winch to rotate; the fixed pulley is installed on the top and the bottom of the vertical fixed support; one end of the steel cable is wound on the roller of the fixed winch, and the other end is wound around the fixed pulley and connected to the working platform; the working platform is connected with the fixed platform through the positioning bolts; The working platform comprises a power section, an execution section and a resistance section, and the power section, the execution section and the resistance section are all connected to the working platform through fixed supports. The power section comprises a liquid storage pool, a liquid conveying pipeline, a water pump, a flow meter, an encoder, a thrust bearing, a pressure sensor, a servo motor, a phase sensor, a gear and a transmission shaft; the flow meter, the phase sensor, the gear, the pressure sensor and the thrust bearing are sequentially connected to the transmission shaft from left to right; the output end of the servo motor is provided with a gear, and the gear on the servo motor is in meshing connection with the gear on the transmission shaft; the water pump is connected with the liquid storage pool and the flow meter through the liquid conveying pipeline; the encoder is connected to the servo motor and is used to measure the angular velocity of a rotating experimental shaft; The execution section comprises an experimental shaft, an organic glass shell, a stabilizer, a thin-wall bearing, a sealed sliding bearing, a tension sensor, an electric push-pull rod, a steel wire, a rubber sealing cover with holes and a wireless integrated strain gauge; the experimental shaft is provided with the stabilizer, and the bottom of the experimental shaft is provided with an opening; the organic glass shell is fixed to the working platform by the fixed supports; the wireless integrated strain gauges are uniformly arranged on the outer surface of the experimental shaft at intervals and are used to collect corresponding strain data; the tension sensor is fixed to the sliding rail; one end of the steel wire is connected to the bottom of the thin-wall bearing, and the other end is connected to the electric push-pull rod through the tension sensor; the fixed supports comprise upper fixed supports and lower fixed supports; the upper fixed supports and the lower fixed supports are connected through bolts, and the lower fixed supports and the working platform are connected through bolts; long strip bolt grooves are arranged on both sides of the working platform, and the lower fixed supports are connected to the long strip bolt grooves of the working platform through bolts. The resistance section comprises a magnetic powder brake, a drill bit, a rock, a sliding rail support, a resistance shaft, a vibration exciter, a torque sensor and a shaft coupling; the magnetic powder brake and the rock are both connected to the sliding rail support; the resistance shaft is a solid shaft, the resistance shaft sequentially passes through the magnetic powder brake, the torque sensor and the shaft coupling to connect the drill bit and the rock, and the tail of the rock is connected to the vibration exciter.

2. The static push-the-bit rotary steerable tool fatigue test bench of claim 1, wherein, The transmission shaft and the experimental shaft have different inner and outer diameters.

3. The static push-the-bit rotary steerable tool fatigue test bench of claim 1, wherein, An annular gap is formed between the organic glass shell and the experimental shaft.

4. The static push-the-bit rotary steerable tool fatigue test bench of claim 1, wherein, The fixed platform further comprises support ribs, and the horizontal fixed supports and the vertical fixed supports are connected through bolts and are reinforced through the support ribs.

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