Static push type rotary steering tool fatigue test bench

Abstract

The invention is suitable for the technical field of oil and gas drilling, 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 bracket, a vertical fixed bracket, 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 all connected to the working platform through fixing supports. The device is simple in structure and easy to operate; the complex working environment of a static pushing type rotary guiding bottom drilling tool assembly can be simulated, and the influence of drilling fluid flowing, guiding force application and drill bit-rock interaction on the fatigue life of the bottom drilling tool assembly is considered; a multi-axial fatigue failure mode of a bottom drilling tool assembly under an external load can be simulated; the fatigue life test can be carried out on the integral structure or a certain part of the rotary guide bottom drilling tool assembly, and random external load can be applied to an experimental object.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas drilling, and in particular relates to a static push-type rotary guide tool fatigue test bench. Background Art

[0002] In the field of oil and gas drilling, we are faced with problems such as deep layers, complex geological structures, and low efficiency. In the exploitation of horizontal wells, extended displacement wells, or high-angle wells, new directional drilling technologies are the key means to develop such oil and gas resources. Rotary directional drilling technology can effectively solve the technical problems of high friction, low drilling speed, easy drilling, and uneven wellbore in the process of sliding directional drilling. However, the force conditions of the rotary directional bottom hole assembly in the well are extremely complex, so extremely high requirements are placed on the vibration and impact resistance, reliability, and stability of the drilling assembly, and these performances need to be improved. The improvement of these performances needs to be analyzed from the perspective of theory and experiment such as drill string dynamics.

[0003] In recent years, the influence of drilling fluid on the dynamics of downhole drill tools has attracted great attention from researchers. The static push-type rotary steerable bottom hole assembly is often in a state of high temperature and high pressure, and due to the interaction between the drill bit and the rock, it will cause severe vibration, resulting in a shortened service life of the bottom hole assembly.

[0004] Full-scale experiments are expensive and difficult to implement, so laboratory model experiments are usually used to simulate the actual working environment. Current indoor experiments on the fatigue life of drill tool assemblies mainly focus on a single type of fatigue failure mode (such as torsional fatigue and bending-torsion fatigue), and usually only consider the material properties of a specific part. However, in actual work, the drill tool assembly is subjected to a variety of complex external loads including bottom drilling pressure, contact force between the drill bit and the well wall, and drill bit torque, and the changes in these loads are very random. In addition, existing experimental devices can usually only apply fixed external loads, which limits the authenticity and accuracy of the experiment. In order to study the effects of factors such as drilling fluid flow, interaction between the drill bit and the rock, and radial guide force on the static push-type rotary guide bottom drill tool assembly or drive shaft, so as to evaluate the fatigue life of downhole drill tools, the present invention proposes a static push-type rotary guide tool fatigue test bench. Summary of the invention

[0005] The purpose of the present invention is to provide a static push-type rotary guide tool fatigue test bench, aiming to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A static push-to-pull rotary guide tool fatigue test bench comprises a fixed support, characterized in that it also comprises a fixed platform and a working platform;

[0008] The fixed platform comprises a horizontal fixed bracket, a vertical fixed bracket, a steel cable, a motor, a fixed winch, a positioning bolt and a fixed pulley; the horizontal fixed bracket and the vertical fixed bracket are fixedly connected; the motor is connected to the fixed winch through a transmission device, and the motor is used to drive the fixed winch to rotate; the fixed pulley is installed at the top and bottom of the vertical fixed bracket; one end of the steel cable is wound around the roller of the fixed winch, and the other end is passed around the fixed pulley and connected to the working platform; the working platform is connected to the fixed platform through the positioning bolt;

[0009] 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;

[0010] The power section includes a liquid reservoir, a liquid infusion 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 meshed and connected with the gear on the transmission shaft; the water pump is connected to the liquid reservoir and the flow meter through the liquid infusion pipeline; the encoder is connected to the servo motor for measuring the angular velocity of the rotating experimental shaft;

[0011] The execution section includes an experimental shaft, an organic glass shell, a stabilizer, a thin-walled bearing, a sealed sliding bearing, a tension sensor, an electric push-pull rod, a steel wire, a rubber sealing cover with a hole, and a wireless integrated strain gauge; the experimental shaft is provided with a stabilizer, and an opening is provided at the bottom of the experimental shaft; the organic glass shell is fixed to the working platform by a fixed support; the outer surface of the experimental shaft is evenly spaced with wireless integrated strain gauges for collecting corresponding strain data; the tension sensor is fixed on the 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 through the tension sensor;

[0012] The resistance section includes a magnetic powder brake, a drill bit, a rock, a slide rail support, a resistance shaft, an exciter, 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 a coupling, and the tail of the rock is connected to the exciter.

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

[0014] Furthermore, long strip bolt grooves are provided on both sides of the working platform, and the lower fixed support is connected to the long strip bolt grooves of the working platform by bolts.

[0015] Furthermore, the transmission shaft and the test shaft have different inner and outer diameters.

[0016] Furthermore, an annular gap is formed between the organic glass shell and the experimental axis.

[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 present invention has the following beneficial effects:

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

[0021] 2. The present invention can simulate the complex working environment of a static push-type rotary steerable bottom drill assembly, and takes into account the effects of drilling fluid flow, application of guiding force, and drill bit-rock interaction on the fatigue life of a static push-type rotary steerable bottom drill assembly. In addition, the multi-axis fatigue failure mode of the bottom drill assembly under external loads can be simulated. The present invention can perform fatigue life tests on the overall structure or a certain component (such as a test shaft) of the rotary steerable bottom drill assembly, and can also apply random external loads (such as drilling pressure, drill bit torque) to the experimental object.

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

[0023] 4. The present invention utilizes real drill bits and rocks to simulate the static push-type rotary guide drill bit-rock interaction.

[0024] 5. The present invention can adjust the angle of the working platform by means of a motor-driven steel cable lifting method to meet different drilling inclination requirements. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0027] Figure 3 It is a structural schematic diagram of the drill bit-rock interaction in the present invention as the resistance of the real drill bit-rock.

[0028] Figure 4 It is a schematic diagram of the resistance section structure in which the drill bit-rock interaction is an external input signal in the present invention.

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

[0030] Figure 6 It is a schematic diagram of the structure of the fixed platform in the present invention.

[0031] In the figure: 1-horizontal fixed bracket; 2-vertical fixed bracket; 3-steel cable; 4-motor; 5-fixed capstan; 6-positioning bolt; 7-fixed pulley; 8-liquid reservoir; 9-liquid delivery 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-transmission shaft; 21-experimental shaft; 22 - plexiglass shell; 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- rubber sealing cover with hole; 36- resistance shaft; 37- vibrator; 38- torque sensor; 39- coupling; 40- wireless integrated strain gauge; 41- support rib. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

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

[0035] The fixed support comprises 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 connected by bolts.

[0036] Both sides of the working platform 14 are provided with long strip bolt grooves, and the lower fixed support 15 is connected to the long strip bolt grooves of the working platform by bolts, so that related components can be flexibly removed, installed, and moved.

[0037] like Figure 1 and Figure 6As shown, as 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, a positioning bolt 6, a fixed pulley 7 and a support rib 41; the horizontal fixed bracket 1 and the vertical fixed bracket 2 are connected by bolts and reinforced by the support rib 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 pulley 7 is 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 bypasses the fixed pulley 7 and is connected to the working platform 14; the working platform 14 is connected to the fixed platform through the positioning bolt 6, and the horizontal fixed bracket 1 and the vertical fixed bracket 2 are both provided with a slide groove, and the two ends of the working platform 14 are respectively slidably connected with the slide grooves of the horizontal fixed bracket 1 and the vertical fixed bracket 2, and when the position of the working platform 14 is adjusted, the positioning bolt 6 fixes the working platform 14 to the fixed platform.

[0038] In the embodiment of the present invention, the steel cable 3 passes through the fixed pulleys 7 at the bottom and top of the vertical fixed bracket 2 and is connected to the working platform 14. 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 a predetermined height, the positioning bolt 6 fixes the working platform 14 to the fixed platform, 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, as a preferred embodiment of the present invention, the working platform 14 includes 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 14 through fixed supports.

[0040] The power section includes a liquid reservoir 8, a liquid infusion 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 transmission shaft 20; the flow meter 11, the phase sensor 18, the gear 19, the pressure sensor 13 and the thrust bearing 12 are connected to the transmission shaft 20 from left to right in sequence; the output end of the servo motor 17 is provided with a gear 19, and the gear 19 on the servo motor 17 is meshed and connected with the gear 19 on the transmission shaft 20; the water pump 10 is connected to the liquid reservoir 8 and the flow meter 11 through the liquid infusion pipeline 9; the encoder 33 is connected to the servo motor 17 for measuring the angular velocity of the rotating experimental shaft 21.

[0041] The execution section includes an experimental shaft 21, an organic glass shell 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 rubber sealing cover with holes 35 and a wireless integrated strain gauge 40; the experimental shaft 21 is provided with a stabilizer 23, and the bottom of the experimental shaft 21 is provided with an opening 26 to facilitate the circulation of drilling fluid; the organic glass shell 22 is fixed to the working platform 14 by a fixed support and does not rotate with the experimental shaft 21, and an annular gap is formed between the organic glass shell 22 and the experimental shaft 21, and the drilling fluid circulates through this gap; the outer surface of the experimental shaft 21 is evenly spaced with wireless integrated strain gauges 40 for collecting corresponding strain data; the tension sensor 27 is fixed on the 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 through the tension sensor 27, thereby forming a structure to apply radial guide 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, an exciter 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 exciter 37.

[0043] In the embodiment of the present invention, the phase sensor 18 can measure the number of rotations through the keyway on the test shaft 21. The transmission shaft 20 and the test shaft 21 have different inner and outer diameters to transmit the torque provided by the servo motor 17. The opening 26 is a radial channel hole evenly distributed in the circumference. The resistance shaft 36 is a solid shaft.

[0044] The downhole drill bit-rock interaction is simulated through the real drill bit 30 and rock 31 or by inputting external working condition signals.

[0045] When a real drill bit 30 and rock 31 are used to simulate the downhole drill bit-rock interaction, the input current of the magnetic powder brake 29 is adjusted to compensate for the torque of the drill bit 30 and the rock 31. The exciter 37 is used to apply axial drilling pressure to the rotating test shaft 21. The corresponding working condition signal can be obtained through the real drill bit 30 and rock 31.

[0046] When the downhole drill bit-rock interaction is simulated by inputting an external working condition signal, 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 outputs a corresponding axial pressure to the working signal input by the exciter 37 for applying the bit pressure to the rotating test shaft 21.

[0047] During operation, the drilling fluid flows into the transmission shaft 20 through the liquid reservoir 8 and the water pump 10, passes through the test shaft 21, the opening 26, the annular gap between the organic glass shell 22 and the test shaft 21, flows out from the perforated sealing rubber cover 35, and returns to the liquid reservoir 8 through the liquid delivery pipeline 9, completing the circulation of the drilling fluid. The servo motor 17 is connected to the transmission shaft 20 through two meshing gears 19, and is used to drive the test shaft 21 to rotate around its own axis. The magnetic powder brake 29 applies circumferential rotation resistance to the rotating test shaft 21, and the exciter 37 is used to apply axial load to the rotating test shaft 21. There is a small hole on the organic glass shell 22 for the steel wire 34 to pass through, so that 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 through the tension sensor 27, thereby forming a structure to apply radial guide force to the test shaft 21.

[0048] The working principle of the present invention is:

[0049] When the static push-to-pull rotary guide tool fatigue test bench is working, firstly, the components required for the experiment are assembled on the working platform 14. Secondly, the motor 4 drives the winch 5 to lift the working platform 14 to the predetermined position and fix it with the positioning bolt 6. Then, the servo motor 17 is used to transmit the angular velocity to the transmission shaft 20 through the gear 19, thereby driving the experimental shaft 21 to rotate. The drilling fluid is transmitted to the experimental shaft 21 by the water pump 10, the infusion pipeline 9, the flowmeter 11, and the reservoir 8, and then flows back to the reservoir 8 after circulation; the input signal of the magnetic powder brake 29 is adjusted to apply the corresponding resistance torque to the rotating experimental shaft 21; the exciter 37 applies the corresponding axial pressure to the rotating experimental shaft 21 according to the input signal; finally, the experimental data of the corresponding sensors such as the phase sensor 18, the wireless integrated strain gauge 41, and the encoder 33 are read, so that the relevant fatigue fracture mechanism can be obtained from the experimental data and the life prediction model can be established.

[0050] The above are only preferred embodiments of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the protection scope of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A static push-type rotary guide tool fatigue test bench, comprising a fixed support, It is characterized in that It also includes fixed platforms and working platforms; The fixed platform comprises a horizontal fixed bracket, a vertical fixed bracket, a steel cable, a motor, a fixed winch, a positioning bolt and a fixed pulley; the horizontal fixed bracket and the vertical fixed bracket are fixedly connected; the motor is connected to the fixed winch through a transmission device, and the motor is used to drive the fixed winch to rotate; the fixed pulley is installed at the top and bottom of the vertical fixed bracket; one end of the steel cable is wound around the roller of the fixed winch, and the other end is passed around the fixed pulley and connected to the working platform; the working platform is connected to the fixed platform through the positioning bolt; 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 includes a liquid reservoir, a liquid infusion 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 meshed and connected with the gear on the transmission shaft; the water pump is connected to the liquid reservoir and the flow meter through the liquid infusion pipeline; the encoder is connected to the servo motor for measuring the angular velocity of the rotating experimental shaft; The execution section includes an experimental shaft, an organic glass shell, a stabilizer, a thin-walled bearing, a sealed sliding bearing, a tension sensor, an electric push-pull rod, a steel wire, a rubber sealing cover with a hole, and a wireless integrated strain gauge; the experimental shaft is provided with a stabilizer, and an opening is provided at the bottom of the experimental shaft; the organic glass shell is fixed to the working platform by a fixed support; the outer surface of the experimental shaft is evenly spaced with wireless integrated strain gauges for collecting corresponding strain data; the tension sensor is fixed on the 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 through the tension sensor; The resistance section includes a magnetic powder brake, a drill bit, a rock, a slide rail support, a resistance shaft, an exciter, 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 a coupling, and the tail of the rock is connected to the exciter.

2. The static push-type rotary guide tool fatigue test bench according to claim 1, It is characterized in that The fixed support comprises an upper fixed support and a lower fixed support; the upper fixed support and the lower fixed support, and the lower fixed support and the working platform are all connected by bolts.

3. The static push-type rotary guide tool fatigue test bench according to claim 2, It is characterized in that Long strip bolt grooves are arranged on both sides of the working platform, and the lower fixed support is connected to the long strip bolt grooves of the working platform by bolts.

4. The static push-type rotary guide tool fatigue test bench according to claim 1, It is characterized in that The transmission shaft and the test shaft have different inner and outer diameters.

5. The static push-type rotary guide tool fatigue test bench according to claim 1, It is characterized in that An annular gap is formed between the organic glass shell and the test shaft.

6. The static push-type rotary guide tool fatigue test bench according to claim 1, It is characterized in that The resistance shaft is a solid shaft.

7. The static push-type rotary guide tool fatigue test bench according to claim 1, It is characterized in that 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.

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