A downhole imaging ground simulation test device

Abstract

The present invention provides a downhole imaging ground simulation test device, which comprises a base with a counterweight that can rotate 360 degrees and be tilted and adjusted, a wellbore support for placing a simulation wellbore, a sensor motion control unit, a controller, an upper control system, a simulation wellbore, and a measurement sensor. The sensor motion control unit consists of a first sliding frame, a second sliding frame, a third sliding frame, a fourth lifting frame, and a fifth rotating shaft, simulating the displacement movement of the sensor in the wellbore; it can simulate the mechanical penetration rate during the drilling process; a rotatable shaft simulates the rotation of the sensor downhole and the pointing of the azimuth sensitive surface of the sensor. A container with a slip ring and a sensor pressure-resistant tube is used to accommodate the sensor and transmit data and power under rotational conditions. It is used to simulate the scanning of the simulation wellbore by the downhole imaging sensor when it is in an eccentric running attitude in the wellbore with different well inclinations, azimuths, tool faces, penetration rates, rotational speeds.

Description

Technical Field

[0001] The present invention relates to the technical field of measurement while drilling, and more particularly to a ground simulation test device for imaging while drilling. Background Art

[0002] When the measurement-while-drilling imaging sensor measures downhole, it is affected by various factors such as different geological environments, well inclination, azimuth, wellbore size, position in the wellbore, movement trajectory, rotation speed, drilling time, mud type, etc. These factors directly affect the data output of measurement while drilling. Currently, instrument calibration often uses calibration wells or experimental wells, but these are often statically placed in the wellbore and cannot simulate the process of imaging while drilling during the drilling process. The experimental results lack the simulation of various environments. Similarly, using real well positions for instrument testing is costly, and data correction and repeated testing cannot be carried out, and the optimization conclusions cannot be verified. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a ground simulation test device for imaging while drilling, which is simple to use, can truly simulate the downhole operating state of the imaging sensor, can export data in real time for analysis and processing, and can verify the experimental results.

[0004] To achieve the above object, an embodiment of the present invention provides a ground simulation test device for imaging while drilling, including:

[0005] A base, the base is connected with a hydraulic lifting part and a rotating motor, the hydraulic lifting part can make the base tilt at a first angle relative to the ground in the vertical direction, and the rotating motor can make the base rotate at a second angle relative to the ground in the horizontal direction;

[0006] A wellbore support, connected to the base, forming an accommodation space and a support plane on the accommodation space;

[0007] A wellbore, the wellbore is placed in the accommodation space and fixed on the base;

[0008] A sensor motion control part, the sensor motion control part is arranged on the support plane;

[0009] Wherein, the sensor motion control part includes a first sliding frame, a second sliding frame, a third sliding frame, a fourth lifting frame and a fifth rotating shaft, and the first sliding frame, the second sliding frame, the third sliding frame, the fourth lifting frame and the fifth rotating shaft are respectively connected with a driving motor;

[0010] The first sliding frame is fixedly connected to the support plane, the second sliding frame is slidably connected to the first sliding frame and slides along a first direction relative to the first sliding frame;

[0011] The third sliding frame is slidably connected to the second sliding frame and slides relative to the second sliding frame in a second direction;

[0012] The fourth lifting frame is fixedly connected to the third sliding frame in a vertical direction and can be lifted up and down relative to the third sliding frame in a third direction;

[0013] The fifth rotating shaft is fixedly connected to the fourth lifting frame and can rotate relative to the fourth lifting frame;

[0014] One end of the fifth rotating shaft extending into the wellbore is fixedly connected with a sensor container, and a measurement sensor can be accommodated in the sensor container;

[0015] A controller, the controller is controllably connected to the drive motor;

[0016] An upper control system, the upper control system is connected to the controller for transmitting control signals to the controller; the upper control system is communicatively connected to the measurement sensor in the sensor container for receiving the data collected by the measurement sensor.

[0017] Further, the measurement sensor is at least one of an azimuth gamma sensor, an accelerometer sensor, a fluxgate sensor, an optical fiber gyro sensor, and an ultrasonic caliper sensor.

[0018] Further, the range of the first angle is 0° - 90°.

[0019] Further, the range of the second angle is 0° - 360°.

[0020] Further, the hydraulic lifting part inclines the base relative to the ground in a vertical direction by a first angle for simulating the well inclination attitude in the measurement process; the rotating motor rotates the base relative to the ground in a horizontal direction by a second angle for simulating the azimuth attitude of the wellbore in the measurement process; the first sliding frame is fixedly connected to the support plane, the second sliding frame is slidably connected to the first sliding frame and can slide relative to the first sliding frame, and the third sliding frame is slidably connected to the second sliding frame and can slide relative to the second sliding frame for simulating the azimuth attitude of the sensor in the measurement process; the fourth lifting frame is fixedly connected to the third sliding frame in a vertical direction and can be lifted up and down relative to the third sliding frame for simulating the movement attitude of the sensor in the measurement process; the fifth rotating shaft is fixedly connected to the fourth lifting frame and can rotate relative to the fourth lifting frame for simulating the rotational speed attitude of the sensor in the measurement process.

[0021] Furthermore, the first sliding frame, the second sliding frame, the third sliding frame, the fourth lifting frame, and the fifth rotating shaft perform compound movements, which can drive the sensor to perform a circular rotational scan around a fixed center in the wellbore with the sensor always facing the wellbore wall, simulating the scanning measurement experiments of instruments with different drill collar diameters on the wellbore.

[0022] Furthermore, a counterweight is provided at one end of the base that can be lifted and tilted to balance the center of gravity after the base is tilted.

[0023] Furthermore, the sensor container is a pressure-resistant pipe that can isolate external mud or high-pressure water flow.

[0024] Furthermore, a slip ring is connected through the middle of the fifth rotating shaft to transmit signals and power energy when the sensor rotates.

[0025] Furthermore, a power supply and a data memory are also provided inside the sensor container. The power supply is electrically connected to the measurement sensor, and the data memory is data-connected to the measurement sensor.

[0026] Furthermore, the upper control system has built-in control software, and the control software can input the rotation speed, drilling time, eccentric rotation parameters, the first angle, and the second angle to perform a wellbore wall scanning simulation motion test on the sensor surface.

[0027] The present invention uses a rotatable and tiltable base and a sensor motion control unit to conduct a downhole imaging instrument scanning experiment.

[0028] Specifically, it includes a base that can rotate 360 degrees and be tilted and adjusted, with a counterweight, a simulation wellbore, a wellbore support for placing the simulation wellbore, a sensor motion control unit, a controller, an upper control system, and a measurement sensor.

[0029] Among them: The base that can rotate 360 degrees and be tilted and adjusted with a counterweight can simulate the postures of the sensor in different orientations and different well inclination situations, and uses a counterweight to prevent the device from losing balance in the tilted state when testing a heavier sensor. The device uses a motor and a hydraulic strut to electrically adjust the rotation orientation and tilt angle by computer. The wellbore support for placing the simulation wellbore has a sensor motion control unit installed on the upper part, is connected to the base at the lower part, and places the simulation wellbore in the middle part.

[0030] The sensor motion control unit consists of a first sliding frame, a second sliding frame, a third sliding frame, a fourth lifting frame, and a fifth rotating shaft, simulating the displacement motion of the sensor in the wellbore; it can simulate the mechanical penetration rate during the drilling process; a rotatable shaft simulating the rotation of the sensor underground and the orientation of the sensor's azimuth-sensitive surface. A container with a slip ring and a sensor pressure-resistant tube for accommodating the sensor and transmitting data and power under rotational conditions. It is used to simulate the attitudes of the sensor underground, such as different well inclinations, azimuths, tool faces, penetration rates, rotational speeds, and motion displacements in the wellbore.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0033] Figure 1 is a schematic structural diagram of a downhole imaging ground simulation test device according to an embodiment of the present invention;

[0034] Figure 2 is a schematic structural diagram of a base in the downhole imaging ground simulation test device according to an embodiment of the present invention.

[0035] In the figure:

[0036] Base 10;

[0037] Wellbore support 11;

[0038] Support plane 111;

[0039] Wellbore 12;

[0040] Measurement sensor 13;

[0041] First sliding frame 141;

[0042] Second sliding frame 142;

[0043] Third sliding frame 143;

[0044] Fourth lifting frame 144;

[0045] Fifth rotating shaft 145;

[0046] Controller 15;

[0047] Upper control system 16;

[0048] Counterweight 17;

[0049] Pressure-resistant tube 18. Detailed implementation manners

[0050] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0051] Reference will be made below to Figure 1 and Figure 2 describe a downhole imaging ground simulation test device according to an embodiment of the present invention.

[0052] The downhole imaging ground simulation test device includes: a base 10, a wellbore support 11 connected to the base 10 and having an accommodation space formed therein, and a wellbore and a sensor motion control unit disposed in the accommodation space.

[0053] Specifically, the base 10 is supported on the ground or on a test bench. Among them, the base 10 is connected with a hydraulic lifting part and a rotary motor. The hydraulic lifting part can make the base 10 tilt relative to the ground by a first angle in the vertical direction, so that the base 10 can be lifted and tilted by a certain angle to simulate an inclined state; the rotary motor can make the base 10 rotate relative to the ground by a second angle in the horizontal direction, so that the base 10 can rotate along the horizontal plane to simulate a horizontal rotation state.

[0054] During specific operation, one end of the hydraulic lifting part is supported on the ground and the other end is supported on the base 10. Thus, when the hydraulic lifting part works, the base 10 can be tilted relative to the ground by a first angle in the vertical direction. For the structure of the hydraulic lifting part, there are many conventional structure options for those skilled in the art, and no limitation is given here.

[0055] During specific operation, the rotary motor can be fixed on a fixed bracket, and the rotary shaft is rotationally connected to the base 10, so as to realize the rotation of the base 10 by a second angle in the horizontal direction. For other conventional connection methods of the rotary motor, there are also conventional structure options for those skilled in the art, and no limitation is given here.

[0056] The wellbore support 11 is connected to the base 10 to form an accommodation space and a support plane 111 on the accommodation space; specifically, the wellbore support 11 is connected to the edge of the base 10 and is fixedly connected to the base 10 in the vertical direction, so that an accommodation space is formed inside, and a support plane 111 is horizontally fixed at one end of the wellbore support 11 away from the base 10.

[0057] The wellbore 12 is disposed in the accommodation space and fixed to the base 10. The wellbore 12 is a simulated wellbore, which can simulate the working environment during the actual operation of the wellbore. Among them, mud, water flow and other actual working conditions can be added to the wellbore model.

[0058] The sensor motion control unit is provided on the support plane 111. This sensor motion control unit is used to simulate various states during the operation of the sensor, and to simulate the postures of the sensor under different well inclinations, azimuths, tool faces, drilling times, rotational speeds, eccentric rotations in the wellbore, and movement displacements in the wellbore in the underground, so as to provide comprehensive sensor posture testing and simulation for the test device placed on the ground.

[0059] Among them, the sensor motion control unit includes a first sliding frame 141, a second sliding frame 142, a third sliding frame 143, a fourth lifting frame 144, and a fifth rotating shaft 145. The first sliding frame 141, the second sliding frame 142, the third sliding frame 143, the fourth lifting frame 144, and the fifth rotating shaft 145 are respectively connected with drive motors.

[0060] The first sliding frame 141 is fixedly connected to the support plane 111. The second sliding frame 142 is slidably connected to the first sliding frame 141 and slides relative to the first sliding frame 141 in a first direction. This first direction can be the left - right direction, that is, the second sliding frame 142 can slide left - right relative to the first sliding frame 141.

[0061] The third sliding frame 143 is slidably connected to the second sliding frame 142 and slides relative to the second sliding frame 142 in a second direction. This second direction can be the front - back direction, that is, the third sliding frame 143 can slide front - back relative to the second sliding frame 142.

[0062] The fourth lifting frame 144 is fixedly connected to the third sliding frame 143 in the vertical direction and can move up and down relative to the third sliding frame 143 in a third direction.

[0063] The fifth rotating shaft 145 is fixedly connected to the fourth lifting frame 144 and can rotate relative to the fourth lifting frame 144. Specifically, the fifth rotating shaft 145 is connected to the fourth lifting frame 144 through an adapter frame. There is a rotating bearing in the adapter frame, and the fifth rotating shaft 145 passes through the rotating bearing to achieve its own stable rotation.

[0064] One end of the fifth rotating shaft 145 extending into the wellbore is fixedly connected with a sensor container, and a measurement sensor 13 can be accommodated in the sensor container.

[0065] A controller 15, the controller 15 is control - connected to the drive motors. Among them, there are multiple drive motors, and each drive motor is respectively drive - connected to the first sliding frame 141, the second sliding frame 142, the third sliding frame 143, the fourth lifting frame 144, and the fifth rotating shaft 145. Each drive motor can independently receive the control signal of the controller 15. Therefore, the controller 15 can control the drive motors to work or stop as needed.

[0066] The upper control system 16 can be a mobile terminal such as a PC computer or a mobile phone. It has a built-in control software that can modify control parameters, achieve control, and receive the data collected by the measurement sensor 13 in real time. The upper control system 16 is connected to the controller 15 for transmitting control signals to the controller 15; the upper control system 16 is communicatively connected to the measurement sensor 13 in the sensor container for receiving the data collected by the measurement sensor 13.

[0067] The upper control system has a built-in control software that can input rotational speed, drilling time, eccentricity parameters, a first angle, and a second angle to perform a simulation motion test on the sensor wellbore scan.

[0068] Specifically, the measurement sensor 13 is at least one of an azimuth gamma sensor, an accelerometer sensor, a fluxgate sensor, an optical fiber gyro sensor, and an ultrasonic caliper sensor. Among them, the azimuth gamma sensor can measure the natural gamma information of the simulated wellbore in different motion postures, the accelerometer sensor and the fluxgate can measure the posture and the measurement tool face of the instrument during scanning, the optical fiber gyro sensor can measure the well inclination and azimuth information during operation, and the ultrasonic caliper sensor can measure the size information of the simulated wellbore during the operation of the device.

[0069] Specifically, the range of the first angle is 0° - 90°, so that the ground simulation test device can simulate the well inclination condition during the operation of the simulated wellbore.

[0070] Specifically, the range of the second angle is 0° - 360°, so as to simulate the working state during the rotary drilling of the wellbore.

[0071] When specifically describing the above first direction, second direction, and third direction, a Cartesian coordinate system is used for specific limitation. Specifically: the first direction is the X direction in the Cartesian rectangular coordinate system, the second direction is the Y direction in the Cartesian direct coordinate system, and the third direction is the Z direction in the Cartesian coordinate system.

[0072] The hydraulic lifting part inclines the base 10 relative to the ground by a first angle in the vertical direction for simulating the well inclination attitude during the measurement process; the rotating motor rotates the base 10 relative to the ground by a second angle in the horizontal direction for simulating the azimuth attitude of the wellbore during the measurement process; the first sliding frame 141 is fixedly connected to the supporting plane, the second sliding frame 142 is slidably connected to the first sliding frame and can slide relative to the first sliding frame 141, and the third sliding frame 143 is slidably connected to the second sliding frame and can slide relative to the second sliding frame 142 for simulating the azimuth attitude of the sensor during the measurement process; the fourth lifting frame 144 is fixedly connected to the third sliding frame 143 in the vertical direction and can move up and down relative to the third sliding frame 143 for simulating the motion attitude of the sensor during the measurement process; the fifth rotating shaft 145 is fixedly connected to the fourth lifting frame 144 and can rotate relative to the fourth lifting frame 144 for simulating the rotational speed attitude of the sensor during the measurement process. The combined movement of the first sliding frame, the second sliding frame, and the third sliding frame can drive the sensor to perform circular planetary rotation around a fixed center in the wellbore. The fourth lifting frame and the fifth rotating shaft can enable the measurement sensitive surface of the sensor to always face the simulated wellbore wall during circular planetary rotation, and can simulate the scanning measurement experiment of the wellbore by instruments with different drill collar diameters.

[0073] Since during actual operation, the base 10 that can rotate 360 degrees and incline 90 degrees can simulate the attitudes of the sensor in different azimuths and different well inclination conditions, and a counterweight 17 is used to prevent the device from losing balance in the inclined state when testing heavier sensors. Therefore, a counterweight 17 is provided at the lifting and inclined end of the base 10.

[0074] To simulate the real working environment, the sensor container is a pressure-resistant pipe 18, which can isolate external mud or high-pressure water flow.

[0075] Specifically, a slip ring is penetrated and connected in the middle of the fifth rotating shaft 145 for transmitting signals and power energy when the sensor rotates.

[0076] In some embodiments, a power supply and a data memory are further provided in the sensor container. The power supply is electrically connected to the measurement sensor, and the data memory is data-connected to the measurement sensor, which can realize the real-time supply of the power demand of the sensor, as well as the real-time transmission and storage of the sensor data.

[0077] The ground simulation test device for downhole imaging provided by the embodiment of the present invention can perform scanning experiments on the simulated wellbore on the ground according to the running posture, wellbore size, and motion characteristics of the downhole instrument. Well inclination, azimuth, drilling time, rotation speed, etc. can be modified and quickly executed in real time, and sensor data can be imported into the processing software for analysis and optimization in real time. The present invention can carry and install the measurement sensor 13 component to accurately simulate the motion characteristics of the integrated instrument installed on the drill collar in the wellbore, and measure the sensitive surface to rotate, slide, swing, and combine motions in the simulated wellbore according to the motion characteristics of the real instrument. The simulation test device measures real features such as sliding drilling and compound drilling in the wellbore. Compared with one-way feature equipment or using real drilling engineering tests, the system is simple and reliable, the effect is observable and controllable, and it can accelerate the optimization of the measurement parameters of the downhole instrument and quickly verify the measurement process and the effect after parameter optimization.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0079] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A ground simulation test device for downhole imaging while drilling, characterized in that, it includes: a base, the base is connected with a hydraulic lifting part and a rotary motor, the hydraulic lifting part can make the base tilt at a first angle relative to the ground in the vertical direction, and the rotary motor can make the base rotate at a second angle relative to the ground in the horizontal direction; a wellbore support, connected to the base, forming an accommodation space and a support plane on the accommodation space; a wellbore, the wellbore is placed in the accommodation space and fixed on the base; a sensor motion control part, the sensor motion control part is arranged on the support plane; wherein, the sensor motion control part includes a first sliding frame, a second sliding frame, a third sliding frame, a fourth lifting frame and a fifth rotating shaft, and the first sliding frame, the second sliding frame, the third sliding frame, the fourth lifting frame and the fifth rotating shaft are respectively connected with a driving motor; the first sliding frame is fixedly connected to the support plane, and the second sliding frame is slidably connected to the first sliding frame and can slide relative to the first sliding frame; the third sliding frame is slidably connected to the second sliding frame and can slide relative to the second sliding frame; the fourth lifting frame is fixedly connected to the third sliding frame in the vertical direction and can move up and down relative to the third sliding frame; the fifth rotating shaft is fixedly connected to the fourth lifting frame and can rotate relative to the fourth lifting frame; one end of the fifth rotating shaft extending into the wellbore is fixedly connected with a sensor container, and a measurement sensor can be accommodated in the sensor container; a controller, the controller is controllably connected to the driving motor; an upper control system, the upper control system is connected to the controller for transmitting control signals to the controller; the upper control system is communicatively connected to the measurement sensor in the sensor container for receiving the data collected by the measurement sensor; The hydraulic lifting part inclines the base relative to the ground by a first angle in the vertical direction for simulating the well inclination attitude during the measurement process; the rotating motor rotates the base relative to the ground by a second angle in the horizontal direction for simulating the azimuth attitude of the wellbore during the measurement process; the first sliding frame is fixedly connected to the support plane, the second sliding frame is slidably connected to the first sliding frame and can slide relative to the first sliding frame, and the third sliding frame is slidably connected to the second sliding frame and can slide relative to the second sliding frame for simulating the azimuth attitude of the sensor during the measurement process; the fourth lifting frame is fixedly connected to the third sliding frame in the vertical direction and can move up and down relative to the third sliding frame for simulating the motion attitude of the sensor during the measurement process; the fifth rotating shaft is fixedly connected to the fourth lifting frame and can rotate relative to the fourth lifting frame for simulating the rotational speed attitude of the sensor during the measurement process; the first sliding frame, the second sliding frame, the third sliding frame, the fourth lifting frame, and the fifth rotating shaft perform a combined motion, which can drive the measurement sensor to rotate around a fixed center in the wellbore to form a plane of the motion trajectory of the measurement sensor, realizing the annular rotational scanning of the wellbore wall and simulating the scanning measurement experiments of instruments with different drill collar diameters on the wellbore; A slip ring is penetrated and connected in the middle of the fifth rotating shaft, which can transmit signals and power energy when the measurement sensor rotates.

2. The downhole imaging ground simulation test device according to claim 1, characterized in that, the measurement sensor is at least one of an azimuth gamma sensor, an accelerometer sensor, a fluxgate sensor, an optical fiber gyro sensor, and an ultrasonic caliper sensor.

3. The downhole imaging ground simulation test device according to claim 1, characterized in that, the range of the first angle is 0° - 90°.

4. The downhole imaging ground simulation test device according to claim 1, characterized in that, the range of the second angle is 0° - 360°.

5. The downhole imaging ground simulation test device according to claim 1, characterized in that, a counterweight is provided at one end of the base for lifting and inclining to keep the center of gravity of the experimental device stable during inclination.

6. The downhole imaging ground simulation test device according to claim 2, characterized in that, the sensor container is a pressure-resistant pipe, which can isolate external mud or high-pressure water flow.

7. The downhole imaging ground simulation test device according to claim 6, characterized in that, a power supply and a data memory are further provided in the sensor container, the power supply is electrically connected to the measurement sensor, and the data memory is data-connected to the measurement sensor.

8. The downhole imaging ground simulation test device according to claim 1, characterized in that, the upper control system is built-in with control software, and the control software can input rotational speed, drilling time, eccentric rotation parameters, the first angle, and the second angle to perform a wellbore wall scanning simulation motion test on the measurement sensor.

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