A deepwater drilling chamber indoor vibration experiment device and experiment method

Abstract

The application relates to a deep-water drilling chamber indoor vibration experiment device and an experiment method. The device comprises a derrick, a flexible drill string, a rigid drill string, a rock sample clamping mechanism, an air wave generator, a torque dynamometer and a sensor group. The actual marine environment is simulated through the air wave generator, and the dynamic characteristic parameters of the drill string system are collected through the torque dynamometer and the sensor, so that the problem that the actual marine environment load cannot be simulated, and the dynamic characteristic parameters of the drill string system cannot be accurately and comprehensively obtained in the prior art is solved.

Description

Technical Field

[0001] This invention belongs to the field of offshore oil drilling technology, specifically relating to a deep-water drilling indoor vibration test device and method. It is mainly used in the field of offshore oil drilling to collect drilling pressure, rotation speed, torque, displacement and vibration data of drill string system through indoor experiments. Background Technology

[0002] In offshore oil drilling, impact and vibration are the main factors restricting the speed and efficiency of deepwater drilling. Conducting laboratory experiments is an important means of studying the dynamic characteristics of deepwater drilling, and also a crucial basis for optimizing and correcting the boundary conditions of various virtual drilling systems. Current deepwater drilling laboratory experimental setups mainly consist of single riser and drilling equipment experimental devices, which cannot accurately simulate the actual working conditions of deepwater drilling. Therefore, existing equipment cannot accurately obtain the dynamic characteristics of the drill string system to explore the vibration characteristics and motion trajectory during offshore drilling.

[0003] In the prior art, a patent entitled "A Simulation Test Device for the Vibration Characteristics of a Riser under Deepwater Drilling Conditions" simulates the vibration performance of a riser under different deepwater drilling conditions. This test device only studies the riser model but does not consider the influence of marine environmental loads on the dynamic characteristics of the drill string. Another patent entitled "An Active Vibration Control System for a Deepwater Drilling Riser System" uses sensors to monitor the vibration information of the deepwater drilling riser system and realizes active control of the lateral and longitudinal vibrations of the deepwater drilling riser system. However, this system also does not consider the influence of marine environmental loads on the drill string system, and the experiment cannot obtain signals such as torsion, which still has certain limitations in understanding the dynamic characteristics of the drill string system.

[0004] Therefore, there is an urgent need to develop a device that can simulate actual deep-water drilling conditions and obtain the dynamic characteristics of the drill string system under these conditions, so as to achieve a more accurate understanding of the dynamic characteristics of the drill string system, reduce and suppress vibration by accurately setting the boundary conditions of the drill string system, and improve the mechanical drilling rate of deep-water drilling. Summary of the Invention

[0005] To address at least one of the problems in the prior art, the present invention aims to provide a deep-water drilling indoor vibration test device and method. The device simulates the actual marine environment by setting up an air wave generator, and collects the dynamic characteristic parameters of the drill string system through a torque measuring instrument and sensors. This solves the problem in the prior art that it cannot simulate the actual marine environmental load and cannot accurately and comprehensively obtain the dynamic characteristic parameters of the drill string system.

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

[0007] A deep-water drilling indoor vibration test apparatus includes:

[0008] A derrick is provided with a power head at its upper part and a torque measuring instrument at its lower end. A flexible drill string is connected to the lower end of the torque measuring instrument. A hydraulic cylinder is connected to the lower end of the flexible drill string. The hydraulic cylinder is fixed on the derrick. A rigid drill string is connected to the lower end of the hydraulic cylinder. A drill bit is connected to the end of the rigid drill string.

[0009] A rock sample clamping mechanism for clamping a rock sample located below the drill bit;

[0010] An air wave generator is installed on one side of the derrick. The air wave generator includes a wave pool located below the power head. The flexible drill string passes through the wave pool from top to bottom.

[0011] The sensor array includes a displacement sensor, an acceleration sensor, and a pressure sensor. The displacement sensor is mounted on the derrick to measure the displacement of the flexible drill string. The acceleration sensor is mounted on the rigid drill string to measure the triaxial acceleration of the rigid drill string. The pressure sensor is mounted at the bottom of the rock sample clamping mechanism to measure the drilling pressure.

[0012] Preferably, the flexible drill string is woven from steel wire rope with high torsional stiffness and low bending stiffness.

[0013] Preferably, the hydraulic cylinder includes a cylindrical cylinder rod, with bearing grooves at both ends of the inner wall of the cylinder rod. A drive shaft passes through the center of the cylinder rod, and the upper and lower ends of the drive shaft are respectively connected to the flexible drill string and the rigid drill string. A bearing is provided between the drive shaft and the cylinder rod, and the bearing is located in the bearing groove. A cylinder sleeve is fitted around the cylinder rod, and the sealed gap between the cylinder sleeve and the cylinder rod is an oil cavity. The cylinder rod is provided with an annular protrusion, which divides the oil cavity into an upper oil cavity and a lower oil cavity. The upper oil cavity and the lower oil cavity are respectively provided with an upper oil port and a lower oil port, and the upper oil port and the lower oil port are connected to an external pressurizing device.

[0014] Preferably, the cylinder barrel is fixed to the derrick.

[0015] Preferably, a limiting rod is longitudinally provided on the cylinder rod, a limiting block is provided on the outer wall of the cylinder barrel, and an opening groove is provided on the limiting block, through which the limiting rod passes.

[0016] Preferably, a limiting pressure plate is connected to the opening slot.

[0017] Preferably, the rock sample clamping mechanism includes a base plate, with upright plates on both sides of the base plate. Through holes are opened at the same positions on both upright plates. An internally threaded cylinder is embedded in the through hole. A screw is screwed into the internally threaded cylinder. A clamping plate is connected to the inner end of the screw. The two clamping plates are used to hold the rock sample.

[0018] Preferably, the pressure sensor is disposed on the bottom surface of the base plate, the pressure sensor is mounted on a pressure sensor base, the pressure sensor base is equipped with rollers, and a track is provided on the ground, the rollers can roll along the track.

[0019] A method for conducting indoor vibration tests in deep-water drilling, based on the aforementioned indoor vibration test apparatus for deep-water drilling, includes the following steps:

[0020] The rock sample is fixed in the rock sample clamping mechanism;

[0021] The air wave generator is activated to create waves in the wave pool, simulating the actual marine environmental load.

[0022] Start the power head, which drives the flexible drill string, rigid drill string, and drill bit to perform rock-breaking drilling on the rock sample;

[0023] Start the hydraulic cylinder to apply drilling pressure to the rigid drill string and drill bit;

[0024] The torque measuring instrument and the sensors in the sensor group collect the torque, rotational speed, displacement of the flexible drill string, the triaxial acceleration of the rigid drill string, and the drilling pressure applied to the rock sample during the rock breaking process of the drill bit.

[0025] Preferably, during the rock-breaking drilling of the rock sample by the drill bit, the drilling pressure and torque of the power head are adjusted according to the depth of the drill bit into the rock sample, the drilling pressure applied to the rigid drill string and the drill bit by the hydraulic cylinder is adjusted, and the wave force generated by the air wave generator is adjusted. The torque measuring instrument and each of the sensors collect the torque, rotation speed, displacement of the flexible drill string, the triaxial acceleration of the rigid drill string, and the drilling pressure applied to the rock sample under different conditions.

[0026] The present invention has the following advantages due to the adoption of the above technical solutions:

[0027] 1. The deep-water drilling indoor vibration test device provided by the present invention includes a derrick, a rock sample clamping mechanism, an air wave generator and a sensor group. The air wave generator simulates the actual marine environment, and the torque measuring instrument and sensors collect the dynamic characteristic parameters of the drill string system. This solves the problem in the prior art that it cannot simulate the actual marine environmental load and cannot accurately and comprehensively obtain the dynamic characteristic parameters of the drill string system.

[0028] 2. The deep-water drilling indoor vibration test device provided by the present invention provides a power system that provides drilling pressure torque to drive the drill bit to break rocks, an air wave generator that can provide waves with different wave speeds, periods and wavelengths, a flexible drill string that can simulate the torsional buckling deformation of the drill string in the deep well in actual drilling, and a hydraulic cylinder that can provide additional drilling pressure, thus solving the problem that the flexible drill string cannot transmit drilling pressure well.

[0029] 3. The deep-water drilling indoor vibration test method provided by this invention can acquire different motion trajectories and different types of vibration modes of the drill string system under different drilling pressure, torque and wave conditions through a data acquisition system. This method realizes the experimental conditions that simulate actual marine drilling conditions, and can more accurately understand the characteristics of deep-water drilling string dynamics. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the deep-water drilling indoor vibration test device provided in Embodiment 1 of the present invention.

[0031] Figure 2 This is a schematic diagram of the structure of the hydraulic cylinder provided in this embodiment of the present invention.

[0032] Figure 3 This is a longitudinal sectional view of the hydraulic cylinder provided in this embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the rock sample clamping mechanism provided in this embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the internal structure of the air wave generator provided in this embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the side structure of the torque measuring instrument provided in this embodiment of the present invention.

[0036] Figure 7 This is a schematic diagram of the main structure of the torque measuring instrument provided in this embodiment of the present invention.

[0037] Figure 8 This is a flowchart of the steps of the deep-water drilling indoor vibration test method provided in Embodiment 2 of the present invention.

[0038] Marked in the attached diagram:

[0039] 1 is the derrick, 2 is the rock sample clamping mechanism, 201 is the base plate, 202 is the vertical plate, 203 is the screw, 204 is the clamping plate, 3 is the air wave generator, 301 is the wave pool, 302 is the equipment room, 303 is the air storage room, 304 is the air chamber, 305 is the electrical control system, 306 is the fan, 307 is the valve, 308 is the silencer, 4 is the power head, 5 is the torque measuring instrument, 501 is the clamping plate, 502 is the power head housing, 503 is the input shaft, 50 4 is the output shaft, 505 is the torque and speed sensor, 506 is the transmitter, 6 is the flexible drill string, 7 is the hydraulic cylinder, 701 is the cylinder rod, 702 is the drive shaft, 703 is the bearing, 704 is the cylinder barrel, 705 is the annular protrusion, 706 is the limit bar, 707 is the limit block, 708 is the limit pressure plate, 8 is the rigid drill string, 9 is the drill bit, 10 is the displacement sensor, 11 is the acceleration sensor, 12 is the pressure sensor, and 13 is the pressure sensor base. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0041] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "assembly," "setup," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] This invention provides a deep-water drilling indoor vibration test device and method. The device includes a derrick, a rock sample clamping mechanism, an air wave generator, and a sensor group. The air wave generator simulates the actual marine environment, and the torque measuring instrument and sensors collect the dynamic characteristic parameters of the drill string system. This solves the problem in the prior art that it cannot simulate the actual marine environmental load and cannot accurately and comprehensively obtain the dynamic characteristic parameters of the drill string system.

[0044] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0045] Example 1

[0046] Please refer to Figure 1 This embodiment provides a deep-water drilling indoor vibration test device, including a derrick 1, a rock sample clamping mechanism 2, an air wave generator 3, and a sensor group;

[0047] A power head 4 is installed on the upper part of the derrick 1, and a torque measuring instrument 5 is installed at the lower end of the power head 4. A flexible drill string 6 is connected to the lower end of the torque measuring instrument 5. A hydraulic cylinder 7 is connected to the lower end of the flexible drill string 6. The hydraulic cylinder 7 is fixed on the derrick 1. A rigid drill string 8 is connected to the lower end of the hydraulic cylinder 7. A drill bit 9 is connected to the end of the rigid drill string 8. A horizontal plate is installed at the bottom of the derrick 1. A through hole is opened on the horizontal plate. The rigid drill string 8 passes through the through hole and connects to the drill bit 9.

[0048] The derrick 1 is installed on the ground. The derrick 1 includes an upper derrick and a lower derrick. The height of the derrick 1 can be adjusted by adjusting the installation position of the upper derrick on the lower derrick.

[0049] The power head 4 can be a power head from an existing water well drilling rig. The power head 4 is mounted on the top of the derrick 1 via a base. The power head 4 provides drilling pressure and torque to the drill bit 9 through the flexible drill string 6 and the rigid drill string 8. The hydraulic cylinder 7 provides greater drilling pressure to the drill bit 9 through the rigid drill string 8, solving the problem that the flexible drill string 6 cannot transmit sufficient drilling pressure to break rocks. The power head 4 and the hydraulic cylinder 7 constitute the power system of the device.

[0050] Please refer to the reference. Figure 2 and Figure 3The hydraulic cylinder 7 includes a cylindrical cylinder rod 701. Bearing grooves are provided at both ends of the inner wall of the cylinder rod 701. A drive shaft 702 passes through the center of the cylinder rod 701. The upper and lower ends of the drive shaft 702 are connected to a flexible drill string 6 and a rigid drill string 8, respectively. A bearing 703 is provided between the drive shaft 702 and the cylinder rod 701. The bearing 703 is a tapered roller bearing and is located within the bearing groove. A cylinder sleeve 704 is fitted over the cylinder rod 701. The sealed gap between the cylinder sleeve 703 and the cylinder rod 701 is an oil cavity. The cylinder rod 701 is provided with an annular protrusion 705, which divides the oil cavity into an upper oil cavity and a lower oil cavity. An upper oil port and a lower oil port are respectively provided at both ends of the upper and lower oil cavities, and the upper and lower oil ports are connected to an external pressurizing device. When oil enters through the upper oil port and exits through the lower oil port, the oil pushes the annular protrusion 705 to move the cylinder rod 701 downward, increasing the drilling pressure of the rigid drill string 8; when oil enters through the lower oil port and exits through the upper oil port, the oil pushes the annular protrusion 705 to move the cylinder rod 701 upward, reducing the drilling pressure of the rigid drill string 8.

[0051] The cylinder barrel 704 is fixed on the derrick 1 by the mounting base. A limit bar 706 is longitudinally provided on the cylinder rod 701. The limit bar 706 is U-shaped and its two ends are connected to the upper and lower ends of the cylinder rod 701 respectively. A limit block 707 is provided on the outer wall of the cylinder barrel 704. An opening groove is opened on the limit block 707. The limit bar 706 passes through the opening groove. A limit pressure plate 708 is connected to the opening groove.

[0052] The limit rod 706, together with the limit block 707, can prevent the cylinder rod 701 from rotating during up and down movement.

[0053] The flexible drill string 6 is woven from steel wire rope with high torsional stiffness and low bending stiffness, enabling the transmission of torque and drill pressure from the power head 4 to the drill bit. The flexible drill string 6 exhibits high torsional strength and low bending strength, simulating the buckling and deformation of the drill string due to its ultra-high slenderness ratio during deep and ultra-deep marine well drilling. The flexible drill string 13 is woven from steel wire rope using different weaving methods, with male and female connectors pressed and welded at both ends, allowing for convenient and stable connection to the torque measuring instrument 5 and the rigid drill string 8. This ensures the stability of the experimental process and realizes a drill string system that undergoes torsion and bending under dynamic marine environmental load disturbances and drill pressure / torque driving.

[0054] The flexible drill string 6 and the rigid drill string 8 constitute the drill string system of the device.

[0055] The rock sample clamping mechanism 2 is used to clamp the rock sample, which is located below the drill bit 9. The drill bit 9 includes a full-size oil drill bit. The rock sample is composed of rock samples of different components. The drill bit 9 can break different types of rock samples.

[0056] Please refer to the reference. Figure 4The rock sample clamping mechanism 2 includes a base plate 201, with upright plates 202 on both sides of the base plate 201. Through holes are formed at the same positions on both upright plates 202, and these through holes can be located at the center of the upright plates 202. An internally threaded cylinder is embedded within the through hole, and a screw rod 203 is screwed onto the internally threaded cylinder. A clamping plate 204 is rotatably connected to the inner end of the screw rod 203. A shaft hole is provided on the outer wall of the clamping plate 204, and the end of the screw rod 203 is inserted into the shaft hole. The screw rod 203 can push the clamping plate 204 inward, and the two clamping plates 204 are used to hold the rock sample. When the rock sample is clamped by the rock sample clamping mechanism 2, the rock sample is placed on the base plate 201, and the screw rods 203 at both ends are rotated. The screw rods 203 push the clamping plates 204 to clamp the rock sample, ensuring the stability of the rock sample during the rock breaking process of the drill bit 9. The rock sample clamping mechanism 2 can clamp rock samples of different sizes and compositions.

[0057] A wrench is provided at the outer end of the screw 203, which makes it easier to rotate the screw 203.

[0058] The rock sample holding mechanism 2, the rock sample and the drill bit 9 constitute the drill bit-rock interaction system.

[0059] Please refer to the reference. Figure 5 The air wave generator 3 is set on one side of the derrick 1. The air wave generator 3 is mounted on the bottom surface by a bracket. The air wave generator 3 includes a wave pool 301, which is located below the power head 4. A hole is opened at the bottom of the wave pool 301. The flexible drill string 6 passes through the hole from top to bottom through the wave pool 301. A sealing plug is provided between the hole and the flexible drill string 6 to prevent water from leaking from the hole.

[0060] The air wave generator 3 can adopt existing technology and includes an equipment room 302, an air storage room 303, and an air chamber 304. The equipment room 302 is equipped with an electrical control system 305 and a fan 306. The fan 306 is a high-pressure centrifugal fan, and the air outlet of the fan 306 is connected to the air storage room 303. The air storage room 303 is connected to the equipment room 302 through a pipeline. A connection port is provided between the air chamber 304 and the equipment room 302. A valve 307 is provided at the connection port. The valve 307, the fan 306, and the electrical control system 305 are connected. A silencer 308 is provided on the equipment room 302. The lower part of the air chamber 304 is connected to the wave pool 301.

[0061] In this embodiment, the air wave generator 12 provides wave force under different marine environmental loads, which dynamically acts on the flexible drill string 6. The rock sample holder 2 fixes different types of rock samples that simulate different strata in actual drilling. The flexible drill string 6 transmits torque to the rigid drill string 8 and then to the drill bit 9. The drill bit 9 interacts with the rock sample to break the rock.

[0062] In this embodiment, the power head 4 can provide a smaller drilling pressure to conduct indoor experiments on the pre-bent flexible drill string 6 and study its buckling deformation. A system composed of an air wave generator 3 and the flexible drill string 6 simulates the dynamic disturbances of wave forces and ocean currents on the drill string system in marine drilling engineering. The electrical control system 305 of the air wave generator 3 controls the airflow of the fan 306 and the opening and closing of the valve 307 to provide waves of different intensities. The fan 306 provides power, and the gas stored in the air storage chamber 303 is introduced into the air chamber 304 through the airflow blown by the fan 306, compressing the free water surface within the air chamber 304. By repeatedly pumping air out of the air chamber 304, waves can be formed in the wave pool 301, simulating the periodic impact of marine environmental loads on the flexible drill string 6, thus realizing the simulation of the drill string system under the influence of dynamic marine environmental loads.

[0063] Please refer to Figure 1 and Figure 2 The sensor group includes a displacement sensor 10, an acceleration sensor 11, and a pressure sensor 12. The displacement sensor 10 is mounted on the derrick 1, specifically on the upper part of the derrick 1, and is used to measure the displacement generated by the flexible drill string 6. The acceleration sensor 11 is fixedly attached to the surface of the rigid drill string 8 and is used to measure the triaxial acceleration of the rigid drill string 8. The pressure sensor 12 is located at the bottom of the rock sample clamping mechanism and is used to measure the drilling pressure of the drill bit 9.

[0064] The pressure sensor 12 is set on the bottom surface of the base plate 201 of the rock sample clamping mechanism 2. The pressure sensor 12 is mounted on the pressure sensor base 13, which is equipped with four rollers. There are two tracks on the ground. The tracks are grooved, and the rollers can roll along the tracks to facilitate the drilling position of the drill bit 9 on the rock sample and to facilitate the removal of the rock sample for replacement.

[0065] Please refer to the accompanying photos. Figure 6 and Figure 7The torque measuring instrument 5 collects torque and speed data of the drill string system during drilling. The torque measuring instrument 5 utilizes existing technology and includes a clamping plate 501, a power head housing 502, an input shaft 503, an output shaft 504, a torque and speed sensor 505, and a transmitter 506. The torque measuring instrument 5 can stably collect and record the speed and torque of the drill string at high speeds. The torque measuring instrument 5 is fixedly mounted on the derrick 1 via the clamping plate 501. The input shaft 503 is connected to the lower end of the power head 4, and the output shaft 54 ​​is connected to the upper end of the flexible drill string. The torque and speed sensor 505 is connected between the input shaft 503 and the output shaft 504. The torque and speed sensor 505 is housed within the power head housing 502, which is connected to the clamping plate 501. A transmitter 506 is installed on the outer wall of the power head housing 502. The transmitter 506 is connected to the control and data processing terminal to transmit the data measured by the torque and speed sensor 505 to the external control and data processing terminal for data processing.

[0066] The torque measuring instrument 5 and the sensors in the sensor group constitute a data acquisition system. The sensors in the data acquisition system are connected to an external control and data processing terminal. The data acquired by the data acquisition system is transmitted to the control and data processing terminal for processing and analysis. Through the data acquisition system, the dynamic characteristics of the drill string system when the drill bit breaks different types of rock samples can be obtained, and the dynamic characteristic parameters of the drill string system under different drilling pressure, rotation speed, and wave conditions can be obtained.

[0067] Example 2

[0068] Please refer to the reference. Figure 8 The deep-water drilling indoor vibration test method provided in this embodiment is completed using the deep-water drilling indoor vibration test apparatus as described in Embodiment 1, and includes the following steps:

[0069] S01, fix the rock sample in the rock sample clamping mechanism 2;

[0070] S02, start the air wave generator 3 to generate waves in the wave pool 301 to simulate the actual marine environmental load;

[0071] S03, start the power head 4, which drives the flexible drill string 6, the rigid drill string 8 and the drill bit 9 to conduct rock-breaking drilling on the rock sample;

[0072] S04, start hydraulic cylinder 7 to apply drilling pressure to rigid drill string 8 and drill bit 9;

[0073] S05, torque measuring instrument 5 and sensors in the sensor group, collect the torque, rotational speed, displacement of flexible drill string 6, triaxial acceleration of rigid drill string 8 and drilling pressure applied to rock sample during the rock breaking process of drill bit 9.

[0074] Furthermore, during the rock-breaking drilling of the rock sample by the drill bit 9, the drilling pressure and torque of the power head 4 are adjusted according to the depth of the drill bit 9 into the rock sample. The drilling pressure applied by the hydraulic cylinder 7 to the rigid drill string 8 and the drill bit 9 is adjusted. The wave force generated by the air wave generator 3 is adjusted. The torque measuring instrument 5 and various sensors collect the torque, speed, displacement of the flexible drill string 6, the triaxial acceleration of the rigid drill string 8, and the drilling pressure applied to the rock sample under different conditions.

[0075] The deep-water drilling indoor vibration test method in this example can carry out vibration data measurement experiments on the rock breaking of the drill bit 9 under different rock samples under different drilling pressure, rotation speed and wave conditions.

[0076] Prepare different types of rock samples, install rock sample clamping mechanism 2 and clamp the rock samples;

[0077] The ground drilling parameters in the indoor experiment are set, including drilling conditions and marine environmental conditions. The drilling conditions include drilling pressure and rotation speed. The drilling pressure and torque driving force are provided by the power head 4 and hydraulic cylinder 7 to set the ground drilling parameters. The marine environmental conditions include the combined force of waves and currents. The wave speed, period and wavelength of the waves are set. The electronic control system 305 of the air wave generator 3 controls the fan 306 and valve 307 to provide wave force under different conditions.

[0078] After determining the surface drilling parameters, the drill bit 9 is raised. A water tap can be installed on one side of the rock sample clamping mechanism 2. The water tap is turned on for standby use to cool the drill bit 9 and flush the rock cuttings. The data acquisition system is turned on, and each sensor and torque measuring instrument 5 starts collecting data. Drilling pressure, torque and wave force are applied to the drill string system to conduct the rock breaking test of the drill bit 9.

[0079] The drilling pressure, torque, and wave force were adjusted according to the depth of the drill bit 9 into the rock. Drill pressure, rotation speed, displacement, and pressure information under different conditions were collected. The above parameters constituted the vibration information of the drill string system, and the experiment was continued.

[0080] When drill bit 9 reaches the bottom of the rock sample, power head 4, hydraulic cylinder 7, and air wave generator 5 are turned off. Experiments on different rock samples are continued, and the above steps are repeated to collect and analyze the vibration information of the drill string system under different rock samples until the experiment ends. Then, power head 4, hydraulic cylinder 7, and air wave generator 3 are turned off again, and the data acquisition system finishes data acquisition. The data collected by the data acquisition system is uploaded to an external control and data processing terminal for processing and analysis, and the dynamic characteristic parameters of the drill string system are analyzed.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A deep-water drilling indoor vibration test device, characterized in that, include: A derrick is provided with a power head at its upper part and a torque measuring instrument at its lower end. A flexible drill string is connected to the lower end of the torque measuring instrument. A hydraulic cylinder is connected to the lower end of the flexible drill string. The hydraulic cylinder is fixed on the derrick. A rigid drill string is connected to the lower end of the hydraulic cylinder. A drill bit is connected to the end of the rigid drill string. The flexible drill string is made of steel wire rope, with male and female connectors pressed and welded at the top and bottom ends respectively, and connected to the torque measuring instrument and the rigid drill string respectively. The hydraulic cylinder includes a cylindrical cylinder rod with bearing grooves at both ends of its inner wall. A drive shaft passes through the center of the cylinder rod, and its upper and lower ends are connected to the flexible drill string and the rigid drill string, respectively. A bearing is provided between the drive shaft and the cylinder rod, and the bearing is located in the bearing groove. A cylinder sleeve is fitted around the cylinder rod, and the sealed gap between the cylinder sleeve and the cylinder rod is an oil cavity. The cylinder rod has an annular protrusion that divides the oil cavity into an upper oil cavity and a lower oil cavity. The upper oil cavity and the lower oil cavity are respectively provided with an upper oil port and a lower oil port, which are connected to an external pressurizing device. The cylinder sleeve is fixed to the derrick. A limit bar is longitudinally arranged on the cylinder rod, and a limit block is arranged on the outer wall of the cylinder barrel. An opening groove is opened on the limit block, and the limit bar passes through the opening groove; a limit pressure plate is connected to the opening groove. A rock sample clamping mechanism is used to clamp a rock sample located below the drill bit. The rock sample clamping mechanism includes a base plate, and upright plates are provided on both sides of the base plate. Through holes are opened at the same position on both upright plates. An internally threaded cylinder is embedded in the through hole. A screw is screwed to the internally threaded cylinder. A clamping plate is connected to the inner end of the screw. The two clamping plates are used to hold the rock sample. An air wave generator is installed on one side of the derrick. The air wave generator includes a wave pool located below the power head, with a flexible drill string passing through the wave pool from top to bottom. An opening is provided at the bottom of the wave pool, and a sealing plug is installed between the opening and the flexible drill string to prevent water leakage. The air wave generator also includes an equipment chamber, an air storage chamber, and an air chamber. An electrical control system and a fan are installed in the equipment chamber. The fan's air outlet is connected to the air storage chamber, and the air storage chamber is connected to the equipment chamber via a pipe. A connection port is provided between the air chamber and the equipment chamber, and a valve is installed at the connection port. The valve, the fan, and the electrical control system are connected. The lower part of the air chamber is connected to the wave pool. The sensor array includes a displacement sensor, an acceleration sensor, and a pressure sensor. The displacement sensor is mounted on the derrick to measure the displacement of the flexible drill string. The acceleration sensor is mounted on the rigid drill string to measure the triaxial acceleration of the rigid drill string. The pressure sensor is mounted at the bottom of the rock sample clamping mechanism and on the bottom surface of the base plate to measure the drilling pressure.

2. The deep-water drilling indoor vibration test apparatus according to claim 1, characterized in that, The flexible drill string is woven from steel wire ropes with high torsional stiffness and low bending stiffness.

3. The deep-water drilling indoor vibration test apparatus according to claim 1, characterized in that, The pressure sensor is mounted on a pressure sensor base, which is equipped with rollers. A track is provided on the ground, and the rollers can roll along the track.

4. A method for indoor vibration testing in deep-water drilling, characterized in that, The test was conducted using the deep-water drilling indoor vibration test apparatus as described in any one of claims 1 to 3, and included the following steps: The rock sample is fixed in the rock sample clamping mechanism; The air wave generator is activated to create waves in the wave pool, simulating the actual marine environmental load. Start the power head, which drives the flexible drill string, rigid drill string, and drill bit to perform rock-breaking drilling on the rock sample; Start the hydraulic cylinder to apply drilling pressure to the rigid drill string and drill bit; The torque measuring instrument and the sensors in the sensor group collect the torque, rotational speed, displacement of the flexible drill string, the triaxial acceleration of the rigid drill string, and the drilling pressure applied to the rock sample during the rock breaking process of the drill bit.

5. The deep-water drilling indoor vibration test method according to claim 4, characterized in that, During rock-breaking drilling of the rock sample, the drilling pressure and torque of the power head are adjusted according to the depth of the drill bit into the rock sample. The drilling pressure applied to the rigid drill string and drill bit by the hydraulic cylinder is adjusted, and the wave force generated by the air wave generator is adjusted. The torque measuring instrument and various sensors collect the torque, rotation speed, displacement of the flexible drill string, the triaxial acceleration of the rigid drill string, and the drilling pressure applied to the rock sample under different conditions.

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