Rotary Steering Instrument Ground Test Device and Its Measuring and Control Methods

Abstract

The present invention provides a ground test device for a rotary steerable instrument, as well as a measurement method and a control method therefor. The ground test device for the rotary steerable instrument comprises a bracket, a first driving member, a rotary steering mechanism, a bit simulator and a steering angle measurement mechanism. The first driving member is arranged on the bracket. The rotary steering mechanism comprises a housing and a mandrel. The first driving member is drivingly connected to the housing. The output end of the mandrel extends towards the side away from the first driving member and is eccentrically arranged with respect to the housing. The output end of the mandrel is connected to the bit simulator. The steering angle measurement mechanism is arranged on the side of the bit simulator away from the first driving member. The ground test device for the rotary steerable instrument in this application can simulate the drilling working condition of the instrument under laboratory conditions, realize simulating ground drilling and obtaining the movement track of the mandrel and the steering angle of the mandrel through the steering angle measurement mechanism, thereby solving the problem in the prior art that there is a lack of an effective ground test device to simulate the drilling working condition, resulting in risks in drilling.

Description

Technical Field

[0001] The present invention relates to the technical field related to oil equipment. Specifically, it relates to a ground test device for a rotary steerable instrument, as well as its measurement method and control method. Background Art

[0002] Traditional sliding steerable drilling methods have certain limitations. For example, the wellbore cleaning efficiency is low, the track control accuracy is insufficient, and the displacement extension ability is limited. Especially, the application effect is not good under complex geological conditions. In sliding steerable drilling, the drill string slides in the wellbore, resulting in large frictional forces, poor wellbore cleaning effect, and prone to drilling sticking, drill string wear and other failures. This not only increases the drilling cost, but also may delay the progress of oilfield development.

[0003] The emergence of rotary steerable drilling technology has broken through this bottleneck. In rotary steerable drilling, the drill string rotates continuously, and at the same time, the steering system can adjust the wellbore trajectory in real time to achieve the expected wellbore geometry. This method greatly improves the wellbore cleaning effect, reduces the accumulation of wellbore sediments. At the same time, the continuous rotational movement reduces the frictional force, extends the service life of the drill string, and improves the drilling speed and drilling efficiency. More importantly, rotary steerable drilling can accurately control the wellbore trajectory. Even in narrow formation intervals or complex geological structures, it can maintain the stability and accuracy of the wellbore. This is of extremely important value for the exploration and development of marine oil and gas resources, as well as for special process wells such as ultra-deep wells, high-difficulty directional wells, cluster wells, and extended reach horizontal wells in onshore complex oil and gas reservoirs.

[0004] However, despite the significant advantages brought by rotary steerable drilling technology, its R & D and verification processes face huge challenges. Currently, there is a lack of effective ground test devices to simulate drilling conditions, especially for the performance testing of pointing rotary steerable instruments, that is, instruments that can maintain a specific direction during drilling. Newly developed instruments or repaired instruments are directly applied to actual drilling without ground testing, which poses great risks. The instrument may exhibit unstable or unpredictable behaviors in the downhole environment, resulting in a decrease in drilling efficiency, or even triggering drilling accidents, causing huge economic losses and safety problems.

[0005] As can be seen from the above, the lack of effective ground test devices in the prior art to simulate drilling conditions leads to risks in drilling. Summary of the Invention

[0006] The main purpose of the present invention is to provide one, so as to solve the problem that the lack of effective ground test devices in the prior art to simulate drilling conditions leads to risks in drilling.

[0007] To achieve the above object, according to one aspect of the present invention, there is provided a ground test device for a rotary steerable instrument. The ground test device for the rotary steerable instrument includes a bracket, a first driving member, a rotary steering mechanism, a bit simulator, and a steering angle measuring mechanism. The first driving member is arranged on the bracket. The rotary steering mechanism includes a housing and a mandrel. The first driving member is drivingly connected to the housing. The input end of the mandrel is arranged inside the housing. The output end of the mandrel extends toward the side away from the first driving member and is eccentrically arranged with respect to the housing. The output end of the mandrel is connected to the bit simulator. The steering angle measuring mechanism is arranged on the side of the bit simulator away from the first driving member for obtaining the steering angle of the bit simulator.

[0008] Further, the ground test device for the rotary steerable instrument further includes rotary joints. One of the rotary joints is a liquid inlet rotary joint, and the other is a liquid outlet rotary joint. The liquid inlet rotary joint is arranged between the first driving member and the rotary steering mechanism. An axially extending first liquid passage is formed between the housing and the mandrel of the rotary steering mechanism. The liquid inlet rotary joint is communicated with the first liquid passage. The liquid outlet rotary joint is arranged at one end of the bit simulator away from the first driving member. A part of the steering angle measuring mechanism is arranged on the liquid outlet rotary joint. A second liquid passage communicated with the first liquid passage is formed on the bit simulator. The second liquid passage is communicated with the liquid outlet rotary joint. The liquid inlet rotary joint, the first liquid passage, the second liquid passage, and the liquid outlet rotary joint form a liquid circulation passage.

[0009] Further, the rotary joint includes a rotary shaft, a housing, and a hose. The rotary shaft has an axially extending circulation passage. The rotary shaft is rotationally connected to the first driving member or the bit simulator. The housing is arranged on the rotary shaft through a bearing. A liquid storage cavity is formed between the housing and the rotary shaft on the outer peripheral side of the rotary shaft. The rotary shaft has a through hole. The circulation passage is communicated with the liquid storage cavity through the through hole. The hose is communicated with the liquid storage cavity.

[0010] Further, the rotary joint further includes a sealing member. The sealing member is arranged between the housing and the rotary shaft. Bearings are arranged on both sides of the liquid storage cavity along the axial direction of the rotary shaft. The sealing member is arranged between the bearing and the liquid storage cavity for isolating the bearing from the liquid storage cavity.

[0011] Further, a biasing mechanism is built inside the rotary steering mechanism. One end of the mandrel is controlled by the biasing mechanism. The biasing mechanism makes the mandrel form a fixed inclination angle with the axis of the housing. The rotary steering mechanism further includes a built-in driving member arranged inside the housing. The built-in driving member is connected to the biasing mechanism. The built-in driving member provides driving force for the rotation of the biasing mechanism, and thus provides driving force for the rotation of the mandrel.

[0012] Further, the ground test device for the rotary steerable instrument further includes a support member. The support member is arranged on the bracket. The rotary steering mechanism is supported on the support member.

[0013] Further, the rotary steering instrument ground test device further includes a loading mechanism. The loading mechanism is arranged on the bracket. The loading mechanism has a pushing structure for providing the weight on bit (WOB). The pushing structure moves toward or away from the bit simulator along the length direction of the bracket.

[0014] Further, the loading mechanism includes a second driving member, a guiding rod, a supporting seat and a pushing structure. The second driving member is arranged on the bracket. The second driving member is connected to the pushing structure. The pushing structure is arranged on the guiding rod. The supporting seat supports the guiding rod. The supporting seat is arranged on the bracket.

[0015] Further, the bit simulator includes a connecting shaft, a thrust self-aligning roller bearing, a ball head and a ball seat. One end of the connecting shaft is connected to the mandrel. The thrust self-aligning roller bearing is sleeved on the connecting shaft. The ball head is mounted on the connecting shaft through the thrust self-aligning roller bearing. The pushing structure has a mounting groove arranged on the outer peripheral side of the connecting shaft. The ball seat is mounted in the mounting groove. The ball head and the ball seat form a spherical surface fit.

[0016] Further, the steering angle measuring mechanism includes a target, an image collector, a laser generator, an adjusting frame and a processor. The target is arranged on the side of the fluid outlet swivel joint of the rotary steering instrument ground test device away from the first driving member. The target has a reflective structure. The laser generator is used to emit light to the target. The image collector receives the light reflected by the reflective structure. The image collector and the laser generator are arranged on the adjusting frame. The processor is signal-connected to the image collector and is used for outputting the steering angle.

[0017] Further, the adjusting frame includes a base, an adjusting rod and a supporting rod. The adjusting rod is slidably arranged on the base along the width direction of the bracket. The supporting rod is slidably arranged on the adjusting rod along the height direction of the bracket. The supporting rod extends toward the target along the length direction of the bracket. The image collector and the laser generator are slidably arranged on the supporting rod along the axial direction of the supporting rod.

[0018] According to another aspect of the present invention, a measuring method is provided, which is applied to the above-mentioned rotary steering instrument ground test device. The rotary steering instrument ground test device has a first steering mode and a second linear mode. The measuring method includes:

[0019] Obtaining a mode instruction and executing the first mode or the second mode according to the mode instruction;

[0020] Executing the first driving member to drive the housing to rotate;

[0021] When the second mode is executed, the first driving member drives the output end of the mandrel to perform a circumferential motion relative to the axis line of the housing, and the steering angle measuring mechanism obtains the reflected light to form an electronic target;

[0022] When the first mode is executed, the output end of the mandrel is stationary relative to the ground, and the steering angle measuring mechanism obtains the steering angle.

[0023] Further, when the first mode is executed, it includes:

[0024] Execute the first driving member to drive the housing of the rotary steering mechanism to rotate in the first direction;

[0025] Execute the built-in driving member of the rotary steering mechanism to drive the biasing mechanism and the mandrel to rotate in the second direction opposite to the first direction, and the rotation speed is equal to the rotation speed in the first direction.

[0026] Further, when the second mode is executed, it includes:

[0027] Execute the first driving member to drive the housing of the rotary steering mechanism to rotate in the first direction;

[0028] Execute the built-in driving member of the rotary steering mechanism to drive the biasing mechanism and the mandrel to rotate in the second direction opposite to the first direction, and the rotation speed maintains a certain rotational speed difference from the rotation speed in the first direction.

[0029] According to another aspect of the present invention, a control method is provided, which is applied to the above-mentioned rotary steering instrument ground test device. The control method includes:

[0030] Obtain an action instruction and execute the first driving member to drive the housing of the rotary steering mechanism to rotate in the first direction;

[0031] Execute the loading mechanism to apply a drilling pressure to the bit simulator;

[0032] Execute to pass circulating water with a preset flow rate;

[0033] Obtain an action instruction and execute the built-in driving member to drive the biasing mechanism to rotate in the second direction opposite to the first direction, and the rotation speed is equal to the rotation speed in the first direction.

[0034] Execute to obtain the steering angle.

[0035] Applying the technical solution of the present invention, the rotary steering instrument ground test device includes a bracket, a first driving member, a rotary steering mechanism, a bit simulator, and a steering angle measuring mechanism. The first driving member is arranged on the bracket. The rotary steering mechanism includes a housing and a mandrel. The first driving member is drivingly connected to the housing. The input end of the mandrel is arranged inside the housing. The output end of the mandrel extends toward the side away from the first driving member and is eccentrically arranged with the housing. The output end of the mandrel is connected to the bit simulator. The steering angle measuring mechanism is arranged on the side of the bit simulator away from the first driving member for obtaining the steering angle of the bit simulator.

[0036] As can be seen from the above, the ground test device for the rotary steerable instrument of the present application can simulate the drilling working conditions of the instrument under laboratory conditions, rotate the instrument, circulate water, and apply drilling pressure, so as to simulate surface drilling and obtain the movement trajectory of the mandrel and the steering angle of the mandrel through the steering angle measuring mechanism, thereby realizing the performance test of the instrument.

[0037] The rotary steering mechanism provided in the present application can achieve the effect of steering during the simulated drilling process, and the present application realizes the rotary steering of the drill bit during the simulated drilling process through the drill bit simulator, thereby realizing the simulation of steering for the test of rotary steering.

[0038] The present application is provided with a steering angle measuring mechanism to obtain the rotation trajectory of the mandrel during straight drilling, and at the same time, it can obtain the steering angle during steering drilling for steering test and performance test. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0040] Figure 1 The overall structural schematic diagram of the ground test device for the rotary steerable instrument of the present invention is shown;

[0041] Figure 2 The structural schematic diagram of the cooperation of the rotary steering mechanism, drill bit simulator, liquid outlet rotary joint and loading mechanism of the present invention is shown;

[0042] Figure 3 The structural schematic diagram of the cooperation of the drill bit simulator and the liquid outlet rotary joint of the present invention is shown;

[0043] Figure 4 The top view of the cooperation of the loading mechanism of the present invention is shown;

[0044] Figure 5 The structural schematic diagram of the steering angle measuring mechanism of the present invention is shown;

[0045] Figure 6 The structural schematic diagram of the laser generator and image collector of the present invention is shown;

[0046] Figure 7 The structural schematic diagram of the electronic target of the present invention is shown;

[0047] Figure 8 The logical block diagram of the measurement method of the present invention is shown;

[0048] Figure 9 The logical block diagram of the control method of the present invention is shown.

[0049] Among them, the above-mentioned drawings include the following reference numerals:

[0050] 10, bracket; 20, first driving member; 30, coupling; 40, rotary joint; 410, rotary shaft; 420, flow passage; 430, bearing; 440, seal; 450, liquid storage cavity; 460, through hole; 470, housing; 50, support member; 60, rotary guiding mechanism; 610, outer shell; 620, mandrel; 70, loading mechanism; 710, second driving member; 720, guiding rod; 730, pushing structure; 740, support seat; 80, bit simulator; 810, thread structure; 820, connecting shaft; 830, thrust-aligning roller bearing; 840, ball head; 850, ball seat; 90, hose; 100, guiding angle measuring mechanism; 1010, fastener; 1020, target; 1030, image collector; 1031, laser generator; 1040, adjusting frame; 1050, processor. Detailed implementation manners

[0051] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0052] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0053] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in relation to the directions shown in the drawings, or in relation to the components themselves in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components themselves, but the above orientation terms are not used to limit the present invention.

[0054] Embodiment 1

[0055] In order to solve the problem in the prior art that there is a lack of an effective ground test device to simulate the drilling working conditions, resulting in risks in drilling, the present application provides a ground test device for a rotary steering instrument, which is used to simulate the ground drilling working conditions and perform performance testing.

[0056] Among them, the structural setting of the present application simulates the ground drilling working conditions, and there is no need to perform performance testing through actual drilling, reducing the risks and corresponding economic losses in the prior art and other problems.

[0057] Such as Figures 1 to 9As shown in the figure, the rotary steering instrument ground test device includes a bracket 10, a first driving member 20, a rotary steering mechanism 60, a bit simulator 80, and a steering angle measuring mechanism 100. The first driving member 20 is arranged on the bracket 10. The rotary steering mechanism 60 includes a housing 610 and a mandrel 620. The first driving member 20 is drivingly connected to the housing 610. The input end of the mandrel 620 is arranged inside the housing 610. The output end of the mandrel 620 extends towards the side away from the first driving member 20 and is eccentrically arranged with the housing 610. The output end of the mandrel 620 is connected to the bit simulator 80. The steering angle measuring mechanism 100 is arranged on the side of the bit simulator 80 away from the first driving member 20 for obtaining the steering angle of the bit simulator 80.

[0058] Wherein, the first driving member 20 is a motor; the housing 610 is a columnar structure, and the axial direction of the housing 610 is arranged in the same direction as the length direction of the bracket 10.

[0059] The length direction of the bracket 10 is Figure 1 the X direction shown in the figure, and the height direction of the bracket 10 is Figure 1 the Z direction shown in the figure.

[0060] Specifically, the rotary steering instrument ground test device of the present application can simulate the drilling working conditions of the instrument under laboratory conditions, rotate the instrument, circulate water, and apply drilling pressure to simulate surface drilling, and obtain the movement trajectory of the mandrel 620 and the steering angle of the mandrel 620 through the steering angle measuring mechanism 100, so as to realize the performance test of the instrument.

[0061] In this embodiment, the first driving member 20, the rotary steering mechanism 60, the bit simulator 80, and the steering angle measuring mechanism 100 are arranged in sequence along the length direction of the bracket 10. The first driving member 20 drives the rotary steering mechanism 60 to rotate. The rotary steering mechanism 60 drives the bit simulator 80 to rotate, and the bit simulator 80 is in the same direction as the mandrel 620. The rotary steering mechanism 60 set in the present application can achieve the effect of simulating the steering in the drilling process, and the present application realizes the rotary steering of the bit in the drilling process through the bit simulator 80, so as to realize the simulation of the steering for the test of the rotary steering. The bit simulator 80 is used to simulate the bit in the drilling process and rotates under the drive of the rotary steering mechanism 60.

[0062] Since the mandrel 620 is eccentrically arranged with the housing 610, in the state of the straight drilling mode, the movement trajectory of the output end of the mandrel 620 forms a circle; when it is necessary to simulate the directional drilling, the mandrel 620 is arranged in a direction with a fixed angle with the ground to realize the simulation of the directional movement of the bit and the performance test of the steering. The present application sets the steering angle measuring mechanism 100 to obtain the rotation trajectory of the mandrel 620 during straight drilling, and at the same time can obtain the steering angle during directional drilling for realizing the steering test and performance test.

[0063] As Figures 1 to 6 shown, the rotary steerable instrument ground test device further includes a rotary joint 40, one of the rotary joints 40 being an inlet liquid rotary joint and the other being an outlet liquid rotary joint. The rotary joint 40 is used to connect with the circulating water supply device of the external structure to realize the liquid flow during the simulated drilling process, that is, the circulating water supply device is connected to the inlet liquid rotary joint for liquid supply, and the circulating water supply device is connected to the outlet liquid rotary joint for liquid collection.

[0064] Among them, the circulating water supply device may include a water tank and a water pump, and the water pump is used to provide driving force for the liquid flow.

[0065] Specifically, the inlet liquid rotary joint is arranged between the first driving member 20 and the rotary steering mechanism 60. The housing 610 and the mandrel 620 form an axially extending first liquid passage, and the inlet liquid rotary joint communicates with the first liquid passage.

[0066] The outlet liquid rotary joint is arranged at one end of the drill bit simulator 80 away from the first driving member 20. A part of the guide angle measuring mechanism 100 is arranged on the outlet liquid rotary joint. The drill bit simulator 80 has a second liquid passage communicating with the first liquid passage, and the second liquid passage communicates with the outlet liquid rotary joint. The inlet liquid rotary joint, the first liquid passage, the second liquid passage and the outlet liquid rotary joint form a liquid circulation channel, and the circulation channel is used for the liquid to flow to realize the recycling of the liquid.

[0067] In this embodiment, the rotary joint 40 includes a rotary shaft 410, a housing 470 and a hose 90. The rotary shaft 410 has an axially extending circulation channel 420. The rotary shaft 410 is rotationally connected to the first driving member 20 or the drill bit simulator 80. The housing 470 is arranged on the rotary shaft 410 through a bearing 430. The housing 470 and the rotary shaft 410 form a liquid storage cavity 450 arranged on the outer peripheral side of the rotary shaft 410. The rotary shaft 410 has a through hole 460, and the circulation channel 420 communicates with the liquid storage cavity 450 through the through hole 460. The hose 90 communicates with the liquid storage cavity 450.

[0068] Among them, in order to improve the stability of the overall structure, a coupling 30 is arranged between the first driving member 20 and the rotary shaft 410.

[0069] Among them, the hose 90 is used to communicate with the external circulating water supply device. The structure of the hose 90 facilitates the rotation of the rotary shaft of the outlet liquid rotary joint to float with the joint during rotation, without restricting the guiding and rotation of the mandrel 620. During the process that the mandrel 620 drives the rotary shaft 410 of the outlet liquid rotary joint to rotate, the housing of the outlet liquid rotary joint can remain stationary or floating according to the test mode. That is, it satisfies the rotation and pointing functions of the mandrel 620 and also satisfies the drainage function of the structure.

[0070] A bearing 430 is provided on the rotating shaft 410, so that while the rotating shaft 410 rotates, the housing 470 can remain stationary or floating according to the test mode. The housing 470 is provided to form a liquid storage cavity 450. The liquid flowing at high speed inside the flow channel 420 enters the inside of the liquid storage cavity 450 through the through holes 460. In this embodiment, 4 through holes 460 are provided, and the 4 through holes 460 are arranged at equal intervals along the circumferential direction of the rotating shaft 410.

[0071] In this embodiment, the rotary joint 40 further includes a seal 440, which is arranged between the housing 470 and the rotating shaft 410. Bearings 430 are arranged on both sides of the liquid storage cavity 450 along the axial direction of the rotating shaft 410, and the seal 440 is arranged between the bearing 430 and the liquid storage cavity 450 to isolate the bearing 430 from the liquid storage cavity 450.

[0072] Among them, the seal 440 can be a structural member such as an O-ring.

[0073] Specifically, the seal 440 seals and isolates the bearing 430 from the liquid storage cavity 450, thereby separating the lubricating oil at the bearing 430 from the water inside the liquid storage cavity 450, realizing oil-liquid separation, which neither affects the circulation of the circulating water nor affects the lubrication of the bearing 430.

[0074] In this embodiment, the rotary steering mechanism 60 further includes an internal biasing mechanism and an internal driving member arranged inside the housing 610. One end of the biasing mechanism is connected to the driving member, and the other end is connected to the mandrel 620. The internal driving member provides a driving force for the rotation of the biasing mechanism. The biasing mechanism forms a fixed inclination angle between the mandrel 620 and the axis of the housing 610.

[0075] In this embodiment, the rotary steering instrument ground test device further includes a support member 50. The support member 50 is arranged on the bracket 10, and the rotary steering mechanism 60 is supported on the support member 50. Since the rotary steering mechanism 60 has an axial length, the coaxiality between the rotary steering mechanism 60 and the first driving member 20 or the inlet rotary joint 40 is improved by setting the support member 50, avoiding non-coaxiality with the first driving member 20 or the inlet rotary joint 40, which may cause the instrument to vibrate violently or get stuck, resulting in the inability to carry out the test normally and affecting the output of the steering angle.

[0076] As Figures 1 to 6 shown, the rotary steering instrument ground test device further includes a loading mechanism 70. The loading mechanism 70 is arranged on the bracket 10. The loading mechanism 70 has a pushing structure 730 for providing the drilling pressure, and the pushing structure 730 moves towards or away from the bit simulator 80 along the length direction of the bracket 10.

[0077] Among them, the loading mechanism 70 is used to apply a drilling pressure to the drill bit simulator 80 to simulate the real drilling scenario and verify the reliability of the internal structure of the instrument. By setting the loading mechanism 70 in this application, the magnitude of the drilling pressure can be adjusted, thereby improving the flexibility of the structural setting and simulating multi-scenario drilling environments.

[0078] Specifically, the loading mechanism 70 includes a second driving member 710, a guide rod 720, a support seat 740, and a pushing structure 730. The second driving member 710 is arranged on the bracket 10. The second driving member 710 is connected to the pushing structure 730. The pushing structure 730 is arranged on the guide rod 720. The support seat 740 supports the guide rod 720, and the support seat 740 is arranged on the bracket 10.

[0079] The second driving member 710 is a hydraulic cylinder. The second driving member 710 provides a driving force for the pushing structure 730. The guide rod 720 and the pushing structure 730 are in sliding fit through a bushing. Further, the second driving member 710 adjusts the position of the pushing structure 730 through the guide rod 720, so as to realize the movement of the pushing structure 730 towards or away from the drill bit simulator 80. When moving towards the drill bit simulator 80, the operation of applying drilling pressure is realized. When moving away from the drill bit simulator 80, the operation of canceling the applied drilling pressure is realized.

[0080] In this embodiment, as Figure 4 shown, a plurality of guide rods 720 are arranged along the width direction of the bracket 10, and a plurality of support seats 740 are arranged along the axial direction of the guide rod 720. The plurality of guide rods 720 are arranged at intervals in parallel, which is beneficial to improving the installation stability of the pushing structure 730.

[0081] In this embodiment, the pushing structure 730 is an annular structure sleeved outside the connecting shaft 820. Pushing the connecting shaft 820 through the structure sleeved outside the connecting shaft 820 is beneficial to improving the uniformity of the force on the connecting shaft 820, and further realizes the provision of uniform drilling pressure.

[0082] As Figure 2 shown, the drill bit simulator 80 includes a connecting shaft 820, a thrust self-aligning roller bearing 830, a ball head 840, and a ball seat 850. One end of the connecting shaft 820 is connected to the mandrel 620 through a threaded structure 810. The thrust self-aligning roller bearing 830 is sleeved on the connecting shaft 820. The ball head 840 is installed on the connecting shaft 820 through the thrust self-aligning roller bearing 830. The pushing structure 730 has a mounting groove provided on the outer peripheral side of the connecting shaft 820. The ball seat 850 is installed in the mounting groove. The ball head 840 and the ball seat 850 are in spherical fit.

[0083] In this application, the bit pressure is applied to the ball seat 850 of the bit simulator 80 through the support seat 740. The ball seat 850 pushes the ball head 840, and the bit pressure acts on the mandrel 620 through the thrust self-aligning roller bearing 830. The ball head 840 and the ball seat 850 form a spherical mating to achieve the swinging rotation of the mandrel 620. The thrust self-aligning roller bearing 830 has the same function as the spherical mating and is used together with the spherical mating. The swinging range of the spherical mating is reduced, and the frictional heat generation of the spherical mating is decreased. The bit simulator 80 enables the mandrel 620 to rotate and orient normally under the application of bit pressure.

[0084] Specifically, by adopting the structural arrangement of the thrust self-aligning roller bearing 830 and the spherical mating formed by the ball head 840 and the ball seat 850, the pointing rotation function of the mandrel 620 is achieved, and it can withstand a large bit pressure.

[0085] As Figure 1 and Figure 5 shown, the guiding angle measuring mechanism 100 includes a target 1020, an image collector 1030, a laser generator 1031, an adjusting frame 1040, and a processor 1050. The target 1020 is arranged on the side of the fluid outlet rotary joint of the rotary steering instrument ground test device away from the first driving member 20. The target 1020 has a reflective structure. The laser generator 1031 is used to emit light rays towards the target 1020. The image collector 1030 receives the light rays reflected by the reflective structure. The image collector 1030 and the laser generator 1031 are arranged on the adjusting frame 1040. The processor 1050 is signal-connected to the image collector 1030 and is used to output the guiding angle.

[0086] Specifically, the non-contact angle measuring device adopted in this application can collect the image of the center of the target 1020. Through image processing, the position and angle of the target 1020 are displayed on the electronic target to test the instrument performance.

[0087] Among them, the target 1020 is installed on the rotary shaft 410 of the fluid outlet rotary joint through the fastener 1010. The fastener 1010 can be a screw and rotates with the rotary shaft 410. The movement trajectory or pointing direction of the target 1020 is consistent with that of the mandrel 620. The movement trajectory of the light rays reflected by the reflective structure is the movement trajectory of the mandrel 620. The trajectory is imaged in the image collector 1030, and the processor 1050 processes the trajectory to form a circle or point to a certain orientation to display the guiding angle.

[0088] The image collector 1030 can be a camera, and the movement trajectory can be imaged through the camera.

[0089] The laser generator 1031 emits auxiliary laser with a specific wavelength band and frequency under the control of the laser drive circuit to eliminate the interference of ambient light.

[0090] As shown Figure 7 in FIG. 1, the processor 1050 is a computer. The computer first eliminates the interference of sunlight to ensure that the system can measure normally without direct sunlight. Then, the image is processed as follows:

[0091] 1. Canny filtering is performed to detect the edges in the image, and it has the advantages of high precision and low false alarm rate.

[0092] 2. The image is subjected to dynamic binaryzation processing to reduce the influence of sunlight in different directions and different uniformity on the measurement.

[0093] 3. The image information after binaryzation processing is subjected to graphic morphology processing to accurately detect the center of the target 1020 with high precision.

[0094] 4. Nonlinear elimination processing is performed on the image information of the center of the target 1020 to improve the detection accuracy.

[0095] 5. Data conversion is performed on the image after nonlinear elimination processing to extract the position data of the center of the target 1020 in the image coordinate system.

[0096] 6. The position data is sent to the human-machine interface software, and various reports, curves, and angle diagrams are formed and displayed by this software.

[0097] In this embodiment, the image processing host can record the position information of the target point as short as every 7 mS, realizing high-speed data processing.

[0098] As shown Figure 5 in FIG. 2, the adjustment frame 1040 includes a base, an adjustment rod, and a support rod. The adjustment rod is slidably arranged on the base along the width direction of the bracket 10, the support rod is slidably arranged on the adjustment rod along the height direction of the bracket 10, the support rod extends toward the side of the target 1020 along the length direction of the bracket 10, and the image collector 1030 and the laser generator 1031 are slidably arranged on the support rod along the axial direction of the support rod.

[0099] Specifically, the image collector 1030 and the laser generator 1031 are arranged on the adjustment frame 1040 to realize the adjustment of the position between the upper, lower, left, and right and front and back directions and the target 1020, so that the center of the target is imaged near the center position of the camera image coordinate system in the image acquisition system. And make the camera CCD plane approximately perpendicular to the center axis of the drill bit.

[0100] In this embodiment, for angle measurement and display: when the instrument is in a straight line state, the first driving member 20 drives the housing 610 to rotate. The biasing mechanism built into the rotation guiding mechanism 60 causes the mandrel to form a fixed inclination angle with the axis of the housing, such that the mandrel performs a circular motion relative to the axis of the housing. The trajectory of the reflected light points scattered by the reflective structure of the target 1020 forms a circle; the camera records the trajectory of the central reflected light point of the target 1020, and the computer measures and calculates the position and radius of the trajectory of the reflected light point to determine the center of the trajectory; a rectangular coordinate system is established with the center of the trajectory as the origin to form an electronic target, and the origin is the axis of the housing 610.

[0101] When guiding the instrument, the first driving member 20 drives the housing 610 to rotate in the first direction, and the biasing mechanism connected to the mandrel 620 rotates in the second direction opposite to the first direction under the drive of the built-in driving member, with the rotation speed being equal to that in the first direction, canceling out the revolution effect of the biasing mechanism, so as to achieve that the mandrel 620 is stationary relative to the ground and points to a certain direction. The position and angle of the reflected light point are displayed on the electronic target, and the guiding angle is output by the test software.

[0102] Embodiment Two

[0103] This embodiment provides a measurement method, which is applied to the ground test device of a rotary steering instrument. The ground test device of the rotary steering instrument is the ground test device of the rotary steering instrument in Embodiment One. The ground test device of the rotary steering instrument has a first mode for guiding and a second mode for straight line, as Figure 8 shown. The measurement method includes:

[0104] Obtain a mode instruction and execute the first mode or the second mode according to the mode instruction;

[0105] Execute the first driving member 20 to drive the housing 610 to rotate;

[0106] When executing the second mode, the first driving member 20 drives the output end of the mandrel 620 to perform a circular motion relative to the axis of the housing 610, and the guiding angle measuring mechanism 100 obtains the reflected light to form an electronic target;

[0107] When executing the first mode, the output end of the mandrel 620 is stationary relative to the ground, and the guiding angle measuring mechanism 100 obtains the guiding angle.

[0108] Among them, the first mode is to simulate the guiding drilling state during the drilling process. By adjusting the pointing of the mandrel 620, the pointing of the drill bit simulator 80 can be achieved, and thus the scenario of simulating drilling towards a preset direction can be realized. The second mode is to simulate the scenario of the straight drilling state.

[0109] In this embodiment, when executing the first mode, it includes:

[0110] Execute the first driving member 20 to drive the housing 610 of the rotary steering mechanism 60 to rotate in the first direction;

[0111] Execute the built-in driving member to drive the offset mechanism and the mandrel to rotate in the second direction opposite to the first direction, and the rotational speed in the second direction is equal to the rotational speed in the first direction. The revolution effect of the offset mechanism is cancelled, so that the offset mechanism is stationary relative to the ground, and further the mandrel controlled by the offset mechanism maintains a predetermined orientation.

[0112] In this embodiment, when the first mode is executed, since the offset mechanism is stationary relative to the ground, the mandrel with a fixed inclination angle to the housing controlled by the offset mechanism points to a predetermined orientation, and the trajectory of the output end of the mandrel forms a point, and the steering angle measuring mechanism acquires the steering angle.

[0113] In this embodiment, when the second mode is executed, it includes:

[0114] Execute the first driving member 20 to drive the housing 610 of the rotary steering mechanism 60 to rotate in the first direction;

[0115] Execute the built-in driving member to drive the offset mechanism and the mandrel to rotate in the second direction opposite to the first direction, and there is a certain rotational speed difference between the rotational speed in the second direction and the rotational speed in the first direction. The offset mechanism revolves relative to the housing 610, and further the mandrel controlled by the offset mechanism makes a circular motion relative to the axis line of the housing;

[0116] In this embodiment, when the second mode is executed, since the offset mechanism revolves relative to the housing 610, the mandrel with a fixed inclination angle to the housing controlled by the offset mechanism makes a circular motion relative to the axis line of the housing, and the trajectory of the output end of the mandrel forms a circle, and the steering angle measuring mechanism acquires the reflected light to form an electronic target.

[0117] Embodiment III

[0118] This embodiment provides a control method, which is applied to the ground test device of the rotary steering instrument. The ground test device of the rotary steering instrument is the ground test device of the rotary steering instrument in Embodiment I, as Figure 9 shown, the control method includes:

[0119] Acquire an action instruction and execute the first driving member 20 to drive the housing 610 of the rotary steering mechanism 60 to rotate in the first direction;

[0120] Execute the loading mechanism 70 to apply a drilling pressure to the drill bit simulator 80;

[0121] Execute the circulating water with a preset flow rate;

[0122] Acquire an action instruction and execute the built-in driving member to drive the offset mechanism to rotate in the second direction opposite to the first direction, and the rotational speed is equal to the rotational speed in the first direction.

[0123] Execute to obtain the orientation angle.

[0124] The preset flow rate can be adjusted adaptively as needed, that is, the flow rate of the circulating water is adjusted by adjusting the circulating liquid supply device.

[0125] In this embodiment, by sequentially executing the first driving member 20 to drive the rotary guiding mechanism 60 to rotate, the loading mechanism 70 to apply a drilling pressure to the drill bit simulator 80, passing the circulating water with a preset flow rate, and obtaining the orientation angle, the simulation of a complete surface drilling, as well as the performance detection and the detection of the orientation angle can be realized.

[0126] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0127] The ground test device of the rotary steering instrument of the present application can simulate the drilling working conditions of the instrument under laboratory conditions, rotate the instrument, pass the circulating water, and apply a drilling pressure, so as to realize the simulation of surface drilling and obtain the movement trajectory of the mandrel 620 and the orientation angle of the mandrel 620 through the orientation angle measuring mechanism 100, and further realize the performance test of the instrument.

[0128] The rotary guiding mechanism 60 provided in the present application can achieve the effect of guiding during the simulated drilling process, and the present application realizes the rotary guiding of the drill bit during the simulated drilling process through the drill bit simulator 80, and further realizes the simulation of the guiding to perform the test of the rotary guiding.

[0129] The present application is provided with an orientation angle measuring mechanism 100 to obtain the rotation trajectory of the mandrel 620 during straight drilling, and at the same time, to obtain the orientation angle during guided drilling for realizing the guiding test and the performance test.

[0130] The present application seals and isolates the bearing 430 from the liquid storage cavity 450 by providing the seal 440, and further separates the lubricating oil at the bearing 430 from the water inside the liquid storage cavity 450, realizing the separation of oil and water, which neither affects the circulation of the circulating water nor affects the lubrication of the bearing 430.

[0131] The present application is provided with a loading mechanism 70 for applying a drilling pressure to the drill bit simulator 80 to simulate the real drilling scenario and verify the reliability of the internal structure of the instrument. By providing the loading mechanism 70, the present application can adjust the magnitude of the drilling pressure, thereby improving the flexibility of the structural setting and simulating the drilling environments of multiple scenarios.

[0132] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0133] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0134] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein.

[0135] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A ground test device for a rotary steerable instrument, characterized in that: include: A bracket (10) and a first driving member (20) arranged on the bracket (10); A rotary guide mechanism (60) comprising a housing (610) and a core shaft (620), wherein the first driving member (20) is drivingly connected to the housing (610), an input end of the core shaft (620) is arranged inside the housing (610), and an output end of the core shaft (620) extends toward a side away from the first driving member (20) and is eccentrically arranged with respect to the housing (610); A drill simulator (80), the output end of the mandrel (620) being connected to the drill simulator (80); A guide angle measuring mechanism (100), arranged on a side of the drill simulator (80) away from the first driving member (20), and used for obtaining the guide angle of the drill simulator (80); The rotary guide mechanism (60) further comprises a built-in driving member and a built-in biasing mechanism disposed inside the housing (610); one end of the mandrel (620) is controlled by the biasing mechanism; the biasing mechanism causes the mandrel (620) to form a fixed inclination angle with the axis of the housing; the built-in driving member is connected to the built-in biasing mechanism; the built-in driving member provides a driving force for the biasing mechanism to rotate, and the built-in driving member further provides a driving force for the mandrel (620) to rotate; The rotary steerable instrument ground test device has a first steerable mode and a second linear mode. In the second mode, the output end of the core shaft (620) performs circular motion relative to the axis of the housing (610). In the first mode, the first drive member (20) drives the housing (610) to rotate in a first direction, and the built-in drive member drives the core shaft (620) to rotate in a second direction opposite to the first direction, with a rotation speed equal to that in the first direction. The output end of the core shaft (620) is stationary relative to the earth, and the steering angle measurement mechanism (100) obtains the steering angle.

2. The rotary steerable instrument ground test device according to claim 1, characterized in that: The rotary steerable instrument ground test device further comprises a rotary joint (40), wherein one of the rotary joints (40) is a liquid inlet rotary joint, and the other is a liquid outlet rotary joint. The liquid inlet rotary joint is arranged between the first driving member (20) and the rotary guide mechanism (60), the housing (610) and the core shaft (620) form a first liquid passage extending axially, and the liquid inlet rotary joint is in communication with the first liquid passage; The liquid outlet rotary joint is arranged at one end of the drill simulator (80) away from the first driving member (20), a part of the guide angle measuring mechanism (100) is arranged on the liquid outlet rotary joint, the drill simulator (80) has a second liquid passage connected to the first liquid passage, the second liquid passage is connected to the liquid outlet rotary joint, and the liquid inlet rotary joint, the first liquid passage, the second liquid passage and the liquid outlet rotary joint form a circulation channel for the liquid.

3. The rotary steerable instrument ground test device according to claim 2, characterized in that: The rotary joint (40) comprises: A rotating shaft (410) having an axially extending flow channel (420), wherein the rotating shaft (410) is rotationally connected to the first driving member (20) or the drill simulator (80); A housing (470), the housing (470) being arranged on the rotating shaft (410) via a bearing (430), the housing (470) and the rotating shaft (410) forming a liquid storage chamber (450) arranged on the outer peripheral side of the rotating shaft (410), the rotating shaft (410) having a through hole (460), the flow channel (420) being connected to the liquid storage chamber (450) via the through hole (460): A hose (90), the hose (90) being in communication with the liquid storage chamber (450).

4. The rotary steerable instrument ground test device according to claim 3, characterized in that: The rotary joint (40) further comprises: A sealing member (440) is disposed between the housing (470) and the rotating shaft (410), and the bearings (430) are disposed on both sides of the liquid storage chamber (450) along the axial direction of the rotating shaft (410). The sealing member (440) is disposed between the bearings (430) and the liquid storage chamber (450) to isolate the bearings (430) from the liquid storage chamber (450).

5. The rotary steerable instrument ground test device according to claim 1, characterized in that: The rotary steering instrument ground test device further comprises a support member (50), wherein the support member (50) is arranged on the bracket (10), and the rotary steering mechanism (60) is supported on the support member (50).

6. The rotary steerable instrument ground test device according to any one of claims 1 to 5, characterized in that: The rotary steerable instrument ground test device further comprises a loading mechanism (70), wherein the loading mechanism (70) is arranged on the support (10), and the loading mechanism (70) has a pushing structure (730) for providing drilling pressure, wherein the pushing structure (730) moves along the length direction of the support (10) toward or away from the drill bit simulator (80).

7. The rotary steerable instrument ground test device according to claim 6, characterized in that: The loading mechanism (70) comprises: A second driving member (710) is arranged on the bracket (10); A guide rod (720), wherein the second driving member (710) is drivingly connected to the pushing structure (730), and the pushing structure (730) is arranged on the guide rod (720); A support seat (740) is arranged on the bracket (10), and the support seat (740) supports the guide rod (720).

8. The rotary steerable instrument ground test device according to claim 6, characterized in that: The drill simulator (80) comprises: A connecting shaft (820), one end of the connecting shaft (820) being connected to the core shaft (620); A thrust spherical roller bearing (830) sleeved on the connecting shaft (820); A ball head (840) and a ball seat (850), wherein the ball head (840) is mounted on the connecting shaft (820) via the thrust spherical roller bearing (830), the pushing structure (730) has a mounting groove arranged on the outer peripheral side of the connecting shaft (820), the ball seat (850) is mounted in the mounting groove, and the ball head (840) and the ball seat (850) cooperate to form a spherical fit.

9. The ground test device of a rotary steerable instrument according to any one of claims 1 to 5, characterized in that: The guide angle measuring mechanism (100) comprises: A target (1020) is arranged on a side of the liquid outlet rotary joint of the rotary steerable instrument ground test device away from the first drive member (20), and the target (1020) has a reflective structure; An image collector (1030) and a laser generator (1031), wherein the laser generator (1031) is used to emit light toward the target (1020), and the image collector (1030) receives light reflected by the reflective structure; An adjustment frame (1040), the image collector (1030) and the laser generator (1031) being arranged on the adjustment frame (1040); A processor (1050), the processor (1050) being connected to the image collector (1030) by signal, and being used to output the guidance angle.

10. The rotary steerable instrument ground test device according to claim 9, characterized in that: The adjustment frame (1040) comprises: Base; An adjustment rod, slidably arranged on the base along the width direction of the bracket (10); a support rod, slidably disposed on the adjustment rod along the height direction of the support (10), the support rod extending along the length direction of the support (10) toward one side of the target (1020); The image collector (1030) and the laser generator (1031) are slidably arranged on the support rod along the axial direction of the support rod.

11. A measurement method, characterized in that: A rotary steerable instrument ground test device applied to any one of claims 1 to 10, wherein the rotary steerable instrument ground test device has a first steerable mode and a second straight line mode, and the measuring method comprises: Obtaining a mode instruction, and executing the first mode or the second mode according to the mode instruction; executing the first driving member (20) to drive the housing (610) to rotate; When the second mode is executed, the first driving member (20) drives the output end of the core shaft (620) to move in a circular motion relative to the axis of the housing (610), and the guide angle measuring mechanism (100) acquires reflected light to form an electronic target; When the first mode is executed, the output end of the spindle (620) is stationary relative to the earth, and the guidance angle measurement mechanism (100) obtains the guidance angle.

12. The measuring method according to claim 11, characterized in that: When executing the first mode, it includes: Executing the first driving member (20) to drive the housing (610) of the rotary guide mechanism (60) to rotate along a first direction; The built-in driving member of the rotary guide mechanism (60) drives the biasing mechanism and the core shaft (620) to rotate in a second direction opposite to the first direction, with a rotation speed equal to the rotation speed in the first direction.

13. The measuring method according to claim 11, characterized in that: When the second mode is executed, it includes: Executing the first driving member (20) to drive the housing (610) of the rotary guide mechanism (60) to rotate along a first direction; The built-in driving member of the rotary guide mechanism (60) drives the biasing mechanism and the core shaft (620) to rotate in a second direction opposite to the first direction, with the rotation speed maintaining a certain rotation speed difference with the rotation speed in the first direction.

14. A control method, characterized in that: The rotary steerable instrument ground test device applied to any one of claims 1 to 10, wherein the control method comprises: Acquiring an action instruction and executing a first driving member (20) to drive the housing (610) of the rotary guide mechanism (60) to rotate along a first direction; The execution loading mechanism (70) applies drilling pressure to the drill simulator (80); Execute circulating water with preset flow rate; Obtaining an action instruction and executing the built-in driving component to drive the biasing mechanism to rotate in a second direction opposite to the first direction, with a rotation speed equal to the rotation speed in the first direction; Execute Get guide angle.

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