Method and related device for measuring position information around the wellbore near the drill bit while drilling

Abstract

The present invention discloses a method for measuring position information of the vicinity of the drill bit while drilling and a related device, wherein the method comprises: using a fluxgate sensor installed near the drill bit to measure the magnetic tool face angle of a rotating instrument; using the well inclination angle and the motor bend angle measured by a logging system while drilling to obtain the angular difference between the magnetic tool face angle and the gravity tool face angle; using the angular difference to compensate the magnetic tool face angle to obtain the gravity tool face angle of the rotating instrument under continuous rotation. The present invention does not use an accelerometer, but converts the measurement of the gravity tool face angle into the measurement of the magnetic tool face angle, measures the magnetic tool face angle through a fluxgate sensor, and uses the angular difference between the magnetic tool face angle and the gravity tool face angle measured by the logging system while drilling to compensate the magnetic tool face angle to obtain the gravity tool face angle, thereby improving the accuracy and stability of the measurement of position information of the vicinity of the drill bit while drilling.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore and land drilling, and in particular to a method and device for measuring position information of a drill bit around a wellbore while drilling, a computing device and a computer storage medium. Background Art

[0002] The key issue of near-bit measurement while drilling is to provide well inclination and dynamic gravity tool face position information around the wellbore. The existing technology generally uses gravity accelerometers for measurement. However, the use of gravity accelerometers for measurement will bring the following two problems:

[0003] First, the gravity accelerometer is very sensitive to vibration. If the accelerometer itself moves, its acceleration value (which can be positive, negative or zero) will be measured. For gravity acceleration, the result of gravity measurement is most accurate when the accelerometer is in a stationary state. During the operation, the drill bit is in a rock-breaking state, and the impact with the rock (such as roller bricks) and cutting (such as PDC drill bits) will produce violent vibrations. The vibration acts on the accelerometer, causing the accelerometer to move irregularly, which will directly affect the measurement results, and it is impossible to accurately measure the current accelerometer's acceleration value for gravity.

[0004] Second, the gravity accelerometer is sensitive to rotation. Compound drilling is a rotary drilling method that uses a turntable or top drive to drive the entire drill tool to rotate. During the rotation of the drill tool, centrifugal force will be generated. The centrifugal force acts on the gravity accelerometer, which will produce a component that has a certain functional relationship with the rotation speed, directly affecting the measurement results. The centrifugal force has a greater impact on the X-axis and Y-axis of the three-axis gravity accelerometer. Although the centrifugal force component measured by the accelerometer on a certain inner diameter drill collar at different rotation speeds can be obtained through multiple experiments and tests, the component is eliminated during the calculation process to obtain the corrected measurement value, and the measurement value is used to calculate the tool face. However, this method is only feasible in theory, but it is difficult to implement in practice, because during the drilling process, the drill bit has friction between the rock breaking, the drill tool and the formation. The complex influencing factors cause the rotation of the drill tool to be not in an ideal uniform speed state, which brings great difficulty to the correction algorithm. In fact, in addition to being affected by centrifugal force, the X-axis and Y-axis are also affected by irregular drill tool vibration, so it is difficult to achieve the expected effect using the rotation correction algorithm. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a method and device for measuring the circumferential position information of the drill bit while drilling, a computing device and a computer storage medium that overcome the above-mentioned problem of low accuracy and stability of the circumferential position information of the drill bit while drilling.

[0006] According to one aspect of the present invention, a method for measuring position information around a drill bit while drilling is provided, comprising:

[0007] The magnetic tool face angle of the rotary tool is measured by using a fluxgate sensor installed near the drill bit.

[0008] The well inclination angle, tool face angle and motor bend angle measured by the logging while drilling system are used to perform well inclination correction on the well inclination angle, and the corrected well inclination angle is obtained as follows:

[0009]

[0010] in, The well inclination angle measured by the logging while drilling system; Tool face angle measured by the logging while drilling system; is the motor bend angle, i.e. the angle between the motor axis and the axis of the logging while drilling system;

[0011] According to the corrected well inclination angle, an angle difference between the magnetic tool face angle and the gravity tool face angle is obtained;

[0012] The angle difference is used to compensate the magnetic tool face angle to obtain the gravity tool face angle of the rotary instrument under continuous rotation conditions.

[0013] In an optional manner, the method of measuring the magnetic tool face angle of the rotary instrument using a fluxgate sensor strapdown mounted near the drill bit further comprises:

[0014] Using the fluxgate sensor to measure and filter the x-axis and y-axis components of the geomagnetic field vector on the radial cross section of the rotating instrument to obtain Hx measurement values ​​and Hy measurement values;

[0015] The instantaneous magnetic tool face angle of the rotary tool is obtained according to the Hx measurement value and the Hy measurement value.

[0016] In an optional manner, after compensating the magnetic tool face angle by using the angle difference to obtain the gravity tool face angle of the rotary instrument under continuous rotation conditions, the method further includes:

[0017] The instantaneous gravity tool face angle is matched as wellbore circumferential position information and time stamp information and stored in the internal memory.

[0018] In an optional manner, the fluxgate sensor is only a dual-axis fluxgate sensor.

[0019] According to another aspect of the present invention, a device for measuring position information around a drill bit while drilling is provided, comprising:

[0020] Fluxgate sensor, strapdown mounted near the drill bit, used to measure the magnetic tool face angle of the rotating instrument;

[0021] The processor is used to perform well inclination correction on the well inclination angle by using the well inclination angle, tool face angle and motor bend angle measured by the logging while drilling system, and obtain the corrected well inclination angle as follows:

[0022]

[0023] in, The well inclination angle measured by the logging while drilling system; Tool face angle measured by the logging while drilling system; is the motor bend angle, that is, the angle between the motor axis and the axis of the logging while drilling system; according to the corrected well inclination angle, the angular difference between the magnetic tool face angle and the gravity tool face angle is obtained; the magnetic tool face angle is compensated by using the angular difference to obtain the gravity tool face angle of the rotary instrument under continuous rotation conditions.

[0024] According to another aspect of the present invention, there is provided a computing device, comprising: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus;

[0025] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute operations corresponding to the above-mentioned method for measuring the position information around the drill bit while drilling.

[0026] According to another aspect of the present invention, a computer storage medium is provided, wherein the storage medium stores at least one executable instruction, wherein the executable instruction enables a processor to execute operations corresponding to the above-mentioned method for measuring position information around the drill bit while drilling.

[0027] According to the solution provided by the present invention, the magnetic tool face angle of the rotating instrument is measured by a fluxgate sensor installed near the drill bit; the angle difference between the magnetic tool face angle and the gravity tool face angle is obtained by using the well inclination angle and the motor bend angle measured by the logging while drilling system; the magnetic tool face angle is compensated by using the angle difference to obtain the gravity tool face angle of the rotating instrument under continuous rotation. The present invention does not use an accelerometer, but converts the measurement of the gravity tool face angle into the measurement of the magnetic tool face angle, measures the magnetic tool face angle by a fluxgate sensor, and compensates the magnetic tool face angle by using the angle difference between the magnetic tool face angle and the gravity tool face angle measured by the logging while drilling system to obtain the gravity tool face angle, thereby improving the accuracy and stability of the measurement of the position information of the wellbore around the drill bit while drilling.

[0028] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0030] Figure 1 A schematic flow chart showing a method for measuring position information around a drill bit while drilling according to an embodiment of the present invention;

[0031] Figure 2 A schematic flow chart showing a method for measuring position information around a wellbore near a drill bit while drilling according to another embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the geomagnetic field vector and three components according to an embodiment of the present invention is shown;

[0033] Figure 4 A schematic diagram of two-axis magnetic components in the transverse direction of an embodiment of the present invention is shown;

[0034] Figure 5a to Figure 5b A schematic diagram of the measurement principle of an embodiment of the present invention is shown;

[0035] Figure 6 A schematic diagram of a module for measuring position information around the wellbore near the drill bit while drilling according to an embodiment of the present invention is shown;

[0036] Figure 7 The schematic diagram of the near-bit well deviation principle and model of an embodiment of the present invention is shown;

[0037] Figure 8 A schematic diagram showing the structure of a device for measuring position information around a wellbore near a drill bit while drilling according to an embodiment of the present invention;

[0038] Fig. 9 A schematic diagram of the structure of a computing device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0039] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0040] Before implementing the embodiments of the present invention, the technical terms involved below are uniformly explained here:

[0041] MWD: Measure While Drilling (MWD). The types of information measured by the downhole logging system near the drill bit mainly include: (1) directional data (such as well inclination, azimuth, tool face angle); (2) formation characteristics (such as gamma ray, resistivity logging records); (3) drilling parameters (such as drilling pressure, torque, and number of revolutions).

[0042] Fluxgate sensor: The fluxgate sensor is a magnetic sensor device that uses the fluxgate phenomenon. When an alternating current flows through the excitation coil of the fluxgate sensor, the alternating magnetic field and the magnetic field to be measured work together to saturate the magnetic core and generate an induced voltage in the detection coil. The purpose of measuring the magnetic field to be measured can be achieved by measuring and analyzing the changes in the induced voltage.

[0043] Gravity Toolface Angle: also known as Gravity Toolface Angle (GTF), refers to the angle selected in the clockwise direction of the tool bevel relative to the high side of the wellbore when looking down at the wellbore.

[0044] Magnetic tool face angle: Magnetic tool face angle (MTF) refers to the angle between the tool bevel direction looking down the wellbore and the magnetic north direction.

[0045] Figure 1 The flowchart of the method for measuring the position information of the drill bit around the wellbore while drilling according to an embodiment of the present invention is shown. This method does not use an accelerometer, but converts the measurement of the gravity tool face angle into the measurement of the magnetic tool face angle. The magnetic tool face angle is measured by a fluxgate sensor, and the angle difference between the magnetic tool face angle and the gravity tool face angle is measured by a logging system while drilling. The magnetic tool face angle is compensated to obtain the gravity tool face angle. Specifically, Figure 1 As shown, the following steps are included:

[0046] Step S101, using a fluxgate sensor strapdown mounted near a drill bit to measure a magnetic tool face angle of a rotary tool.

[0047] In this embodiment, a dual-axis fluxgate sensor is strapdown-installed at a small while-drilling near-bit position, and the instantaneous magnetic tool face angle of the rotating instrument is obtained by measuring the geomagnetic field vector. The dual-axis fluxgate sensor can also dynamically measure the circumferential position information of the small while-drilling near-bit, for example, providing dynamic circumferential position information for the near-bit gamma and resistivity. Because the measurement accuracy of the fluxgate is almost unaffected by vibration shock and rotation conditions, under continuous rotation conditions, the real-time measurement of the gravity tool face angle can be converted into the real-time measurement of the magnetic tool face angle. It should be noted that not installing an accelerometer at the near-bit while-drilling position can reduce the cost of near-bit while-drilling measurement, while obtaining excellent test performance.

[0048] Step S102, using the well inclination angle and the motor bend angle measured by the logging while drilling system to obtain the angle difference between the magnetic tool face angle and the gravity tool face angle.

[0049] In this embodiment, the well inclination angle near the drill bit while drilling refers to the angle between the motor axis and the plumb line, and the motor bend angle refers to the angle between the motor axis and the MWD axis. Specifically, the well inclination angle and the motor bend angle measured by the logging while drilling system are used to obtain the angular difference between the magnetic tool face angle and the gravity tool face angle. Optionally, the well inclination angle, the tool face angle, and the motor bend angle measured by the logging while drilling system are used to obtain the angular difference between the magnetic tool face angle and the gravity tool face angle.

[0050] Step S103, compensating the magnetic tool face angle by using the angle difference to obtain the gravity tool face angle of the rotating instrument under the condition of continuous rotation.

[0051] In this embodiment, the angular difference between the gravity tool face angle and the magnetic tool face angle refers to the angle between magnetic north and the gravity high side, which is only related to the well inclination and azimuth, and has nothing to do with the drilling tool rotation angle (i.e., the gravity tool face angle).

[0052] Another characteristic of measurement while drilling is that the attitude changes slowly, so the attitude can be considered to be a fixed value within a certain period of time, that is, the angle between the geomagnetic field and the instrument axis is a fixed value within a certain period of time. The magnetic tool face is based on the projection of the geomagnetic field on the instrument cross section, and the gravity tool face is based on the gravity high side. Figure 5b As shown, the instantaneous magnetic tool face angle (MTF) of the high-speed rotating tool obtained by calculation is added to the fixed angle (GM) between the magnetic tool face angle and the gravity tool face angle measured by MWD to obtain the gravity tool face angle (GTF), that is, the position information of the gravity high side reference is obtained indirectly.

[0053] Specifically, the magnetic tool face angle is compensated according to the angle difference between the measured instantaneous magnetic tool face angle of the rotating instrument and the magnetic tool face and gravity tool face angle measured at the MWD directional probe, and the instantaneous gravity tool face angle of the rotating instrument under continuous rotation is obtained.

[0054] The solution provided by the above-mentioned embodiment of the present invention uses a fluxgate sensor installed near the drill bit to measure the magnetic tool face angle of the rotating instrument; uses the well inclination angle and motor bend angle measured by the logging while drilling system to obtain the angular difference between the magnetic tool face angle and the gravity tool face angle; uses the angular difference to compensate the magnetic tool face angle to obtain the gravity tool face angle of the rotating instrument under continuous rotation conditions. The present invention does not use an accelerometer, but converts the measurement of the gravity tool face angle into the measurement of the magnetic tool face angle, measures the magnetic tool face angle through a fluxgate sensor, and uses the angular difference between the magnetic tool face angle and the gravity tool face angle measured by the logging while drilling system to compensate the magnetic tool face angle to obtain the gravity tool face angle, thereby improving the accuracy and stability of the measurement of the near-drill bit annular wellbore position information while drilling.

[0055] Figure 2 FIG. 2 is a flow chart showing a method for measuring the position information of the vicinity of the drill bit while drilling according to another embodiment of the present invention. Figure 2 As shown, the following steps are included:

[0056] Step S201, using a fluxgate sensor to measure and filter the x-axis and y-axis components of the geomagnetic field vector on the radial cross section of the rotating instrument to obtain Hx measurement values ​​and Hy measurement values; and obtaining the instantaneous magnetic tool face angle of the rotating instrument based on the Hx measurement values ​​and the Hy measurement values.

[0057] The working environment of the measurement while drilling tool is very harsh underground, with strong vibration and shock, especially near the drill bit. Since the fluxgate sensor is not sensitive to vibration, such as Figure 3 , Figure 4 As shown, by using a dual-axis fluxgate sensor installed in a vertical strapdown, the components of the geomagnetic field in the radial x and y (i.e., radial plane) of the instrument are sampled and filtered at high speed to obtain Hx measurement values ​​and Hy measurement values, and the instantaneous magnetic tool face angle of the rotating instrument is obtained based on the Hx measurement values ​​and Hy measurement values.

[0058] In an optional manner, the fluxgate sensor is only a dual-axis fluxgate sensor.

[0059] In this embodiment, only one dual-axis fluxgate sensor is used, which can reduce engineering costs while ensuring the measurement accuracy of the fluxgate sensor.

[0060] Step S202, performing well inclination correction on the well inclination angle using the well inclination angle, tool face angle and motor bend angle measured by the logging while drilling system to obtain a corrected well inclination angle; and obtaining the angular difference between the magnetic tool face angle and the gravity tool face angle based on the corrected well inclination angle.

[0061] In this embodiment, the working principle and model for obtaining the near-bit well deviation are as follows: Figure 7 As shown, usually, a near-bit annulus azimuth measurement module is installed on the motor lower sub. Here, the well inclination angle refers to the angle between the motor axis PO and the plumb line KV1. The well inclination angle measured by the MWD system can be used and motor angle The well inclination angle at the module installation position (motor axis) is obtained. In the prior art, an accelerometer is usually installed near the drill bit to measure the well inclination angle, but this position is very close to the motor. During the operation, the drill bit is in a rock-breaking state, and the impact with the rock (such as the roller brick) and cutting (such as the PDC drill bit) will produce violent vibrations. The vibration acts on the accelerometer, which seriously reduces the measurement accuracy. In addition, under the high-speed rotation of the motor and the rotation of the drill pipe, the speed will reach about 450 RPM (revolutions per minute), and MWD can accurately measure the dynamic well inclination angle at up to 450 RPM. Therefore, the well inclination of the MWD can accurately obtain the motor position well inclination, and the additional addition table is omitted.

[0062] like Figure 7 As shown, The well inclination angle near the drill bit (corrected well inclination angle) that needs to be obtained is the angle between the motor axis and the plumb line; The well inclination angle measured by the MWD tool; is the motor bending angle, i.e. the angle between the motor axis and the MWD axis; It is the tool face angle measured by the logging while drilling system. When the rotary instrument is drilling, the near-bit measurement module rotates around the motor axis and the MWD axis, and its motion trajectory is conical. Figure 7 The middle right figure is an equivalent model of the well deviation algorithm, which can be used to obtain the virtual well deviation near the drill bit installation position, also known as the corrected well deviation.

[0063] Specifically, firstly, the well inclination angle is corrected by using the well inclination angle, tool face angle and motor bend angle measured by the logging while drilling system to obtain the corrected well inclination angle.

[0064] In an optional manner, the well inclination angle, the tool face angle and the motor bend angle measured by the logging while drilling system are used to perform well inclination correction on the well inclination angle, and the specific formula for obtaining the corrected well inclination angle is:

[0065]

[0066] like Figure 7 As shown, The well inclination angle measured by the logging while drilling system; Tool face angle measured by the logging while drilling system; is the motor bend angle, that is, the angle between the motor axis and the axis of the LWD system.

[0067] The derivation process of the above-mentioned specific formula for correcting the well inclination angle is as follows: Figure 7 It can be seen that:

[0068]

[0069] By using this well deviation correction method, high-precision dynamic well deviation can be obtained even without installing an additional meter near the drill bit.

[0070] Then, the angle difference between the magnetic tool face angle and the gravity tool face angle is obtained according to the corrected well inclination angle.

[0071] In an optional manner, the specific formula for obtaining the angle difference between the magnetic tool face angle and the gravity tool face angle according to the corrected well inclination angle is:

[0072]

[0073] like Figure 5a to Figure 5b As shown, is the angular difference; is the magnetic inclination; To correct the well inclination.

[0074] Step S203, compensating the magnetic tool face angle by using the angle difference to obtain the gravity tool face angle of the rotating instrument under the condition of continuous rotation.

[0075] like Figure 5b As shown, the magnetic tool face angle MTF is compensated by using the angle difference GM to obtain the gravity tool face angle GTF of the rotating instrument under continuous rotation conditions.

[0076] Step S204: Match the instantaneous gravity tool face angle as wellbore circumferential position information and timestamp information and store them in an internal memory.

[0077] The instantaneous gravity tool face angle is matched as the wellbore circumferential position information and the timestamp information and stored in the internal memory. Optionally, the wellbore circumferential position information includes the corrected well inclination angle, the supplemented magnetic tool face angle and the information measured by the logging while drilling system.

[0078] The solution provided by the above-mentioned embodiment of the present invention performs well inclination correction on the well inclination angle by measuring the well inclination angle, tool face angle and motor bend angle obtained by the while drilling logging system, and compensates the magnetic tool face angle by the corrected well inclination angle to obtain the gravity tool face angle of the rotating instrument under continuous rotation conditions, thereby further improving the accuracy of the measurement of the near-bit annular wellbore position information while drilling.

[0079] It should be noted that, according to the solution provided in the above embodiment, a complete functional module (called a dynamic measurement module for the near-bit annular wellbore position) can be set up as a real-time indirect measurement of the drilling tool gravity tool face angle in the while drilling measurement system, and directly installed or coupled to the while drilling measurement system for use, which is not only low in cost and small in size, but also powerful and flexible in performance. Figure 6 As shown, the near-bit annular wellbore position measurement module obtains the original Hx signal and Hy signal through X-axis flux gate and Y-axis flux gate sampling, and obtains the position signal (also called sector signal) after data filtering and smoothing. At the same time, the drill pipe rotation speed is calculated according to the preset refresh rate, and the stored annular wellbore position information and time length are flexibly adjusted according to application requirements. The instrument requiring dynamic annular wellbore position information sends a position request with a timestamp to the near-bit annular wellbore position indication module. After obtaining the communication instruction content and the timestamp signal, the near-bit annular wellbore position indication module queries the memory data and returns the annular wellbore position information corresponding to the timestamp to the requesting instrument.

[0080] The main advantages of the above-mentioned near-bit annular wellbore position dynamic measurement module include the following:

[0081] (1) The mechanical structure is designed with an installation reference base surface. The three-axis orthogonal axis system of the fluxgate sensor is consistent with the external installation reference of the overall structure of the near-bit annular wellbore position indicator module and the measurement module (the installation error angle is less than 0.1°).

[0082] (2) Only a dual-axis fluxgate is used, which is small in size and does not use an accelerometer. The structural strength of the near-bit annular wellbore position indication module and the measurement module must meet the environmental conditions of vibration and impact under actual working conditions.

[0083] (3) The near-bit annular wellbore position indication module and measurement module compensate for the current-induced magnetic field to avoid or reduce interference with the current and affect the measurement accuracy.

[0084] (4) The system has passed experiments such as normal temperature static fluxgate model and calibration, testing, temperature drift model, dynamic measurement parameter calibration and accuracy testing under rotating conditions.

[0085] (5) The problem of inconsistent dynamic characteristics of the fluxgate in the x and y axes when the drill bit speed reaches 240 rpm under high-speed rotation was solved. Actual tests show that the amplitude-frequency and phase-frequency characteristics of the fluxgate vary greatly with the drill bit speed. By accurately measuring its frequency characteristics, amplitude and phase compensation can be performed during dynamic measurement of the instrument, and dynamic tests of the x and y axes and the corresponding amplitude-frequency and phase-frequency characteristics can be measured.

[0086] (6) Dynamic measurement compensation under high-speed rotation is realized. The measurement accuracy of drill pipe rotation speed is reduced to between 10 RPM and 300 RPM. The fluxgate amplitude and phase are regressed using the rotation speed. The phase is compensated by table lookup, which solves the lag problem of the measurement angle and significantly improves the measurement accuracy of the dynamic magnetic tool face angle.

[0087] (7) When the inclination angle between the geomagnetic field and the instrument axis is greater than 3°, the static measurement accuracy of the azimuth sector angle around the wellbore can be better than 0.2°, and the instantaneous measurement accuracy can be better than 1° at a rotation speed of 450 rpm.

[0088] Figure 8 The schematic diagram of the structure of the device for measuring the position information of the circumference of the wellbore near the drill bit while drilling according to an embodiment of the present invention is shown. The device for measuring the position information of the circumference of the wellbore near the drill bit while drilling 800 comprises: a fluxgate sensor 810 and a processor 820.

[0089] The fluxgate sensor 810 is strapdown mounted near the drill bit and is used to measure the magnetic tool face angle of the rotary instrument;

[0090] The processor 820 is used to use the well inclination angle and motor bend angle measured by the logging while drilling system to obtain the angular difference between the magnetic tool face angle and the gravity tool face angle; use the angular difference to compensate the magnetic tool face angle to obtain the gravity tool face angle of the rotating instrument under continuous rotation conditions.

[0091] In an optional manner, the fluxgate sensor 810 is further used for:

[0092] Measuring and filtering the x-axis and y-axis components of the geomagnetic field vector on the radial cross section of the rotating instrument to obtain the Hx measurement value and the Hy measurement value;

[0093] The instantaneous magnetic tool face angle of the rotary tool is obtained according to the Hx measurement value and the Hy measurement value.

[0094] In an optional manner, the processor 820 is further configured to:

[0095] Performing well inclination correction on the well inclination angle using the well inclination angle, tool face angle and motor bend angle measured by the logging while drilling system to obtain a corrected well inclination angle;

[0096] According to the corrected well inclination angle, the angle difference between the magnetic tool face angle and the gravity tool face angle is obtained.

[0097] In an optional manner, the processor 820 is further configured to:

[0098] The specific formula for obtaining the corrected well inclination angle is:

[0099]

[0100] in, The well inclination angle measured by the logging while drilling system; Tool face angle measured by the logging while drilling system; is the motor bend angle, that is, the angle between the motor axis and the axis of the LWD system.

[0101] In an optional manner, the processor 820 is further configured to:

[0102] The specific formula for obtaining the angle difference between the magnetic tool face angle and the gravity tool face angle is:

[0103]

[0104] in, is the angular difference; is the magnetic inclination; To correct the well inclination.

[0105] In an optional manner, the processor 820 is further configured to:

[0106] The instantaneous gravity tool face angle is matched as wellbore circumferential position information and time stamp information and stored in the internal memory.

[0107] In an optional manner, the fluxgate sensor 810 is a dual-axis fluxgate sensor.

[0108] The solution provided by the above embodiment of the present invention uses a fluxgate sensor installed near the drill bit to measure the magnetic tool face angle of the rotating instrument; uses the well inclination angle and motor bend angle measured by the logging while drilling system to obtain the angular difference between the magnetic tool face angle and the gravity tool face angle; uses the angular difference to compensate the magnetic tool face angle to obtain the gravity tool face angle of the rotating instrument under continuous rotation. The present invention does not use an accelerometer, but converts the measurement of the gravity tool face angle into the measurement of the magnetic tool face angle, measures the magnetic tool face angle through a fluxgate sensor, and uses the angular difference between the magnetic tool face angle and the gravity tool face angle measured by the logging while drilling system to compensate the magnetic tool face angle to obtain the gravity tool face angle, thereby improving the accuracy and stability of the measurement of the near-drill bit annular well position information while drilling.

[0109] Fig. 9 A schematic diagram of the structure of an embodiment of a computing device of the present invention is shown. The specific embodiment of the present invention does not limit the specific implementation of the computing device.

[0110] like Fig. 9As shown, the computing device may include: a processor (processor) 902, a communication interface (Communications Interface) 904, a memory (memory) 906, and a communication bus 908.

[0111] The processor 902, the communication interface 904, and the memory 906 communicate with each other via a communication bus 908. The communication interface 904 is used to communicate with other devices such as a client or other server network elements. The processor 902 is used to execute a program 910, which can specifically execute the relevant steps in the above-mentioned embodiment of the method for measuring the position information around the drill bit while drilling.

[0112] Specifically, the program 910 may include program codes, which include computer operation instructions.

[0113] The processor 902 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. The one or more processors included in the computing device may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0114] The memory 906 is used to store the program 910. The memory 906 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0115] The program 910 may be specifically configured to enable the processor 902 to perform the following operations:

[0116] The magnetic tool face angle of the rotary tool is measured by using a fluxgate sensor installed near the drill bit.

[0117] The angle difference between the magnetic tool face angle and the gravity tool face angle is obtained by using the well inclination angle and the motor bend angle measured by the logging while drilling system;

[0118] The angle difference is used to compensate the magnetic tool face angle to obtain the gravity tool face angle of the rotary instrument under continuous rotation conditions.

[0119] In an optional manner, the program 910 enables the processor to perform the following operations:

[0120] Using the fluxgate sensor to measure and filter the x-axis and y-axis components of the geomagnetic field vector on the radial cross section of the rotating instrument to obtain the Hx measurement value and the Hy measurement value;

[0121] The instantaneous magnetic tool face angle of the rotary tool is obtained according to the Hx measurement value and the Hy measurement value.

[0122] In an optional manner, the program 910 enables the processor to perform the following operations:

[0123] Performing well inclination correction on the well inclination angle using the well inclination angle, tool face angle and motor bend angle measured by the logging while drilling system to obtain a corrected well inclination angle;

[0124] According to the corrected well inclination angle, the angle difference between the magnetic tool face angle and the gravity tool face angle is obtained.

[0125] In an optional manner, the program 910 enables the processor to perform the following operations:

[0126] The specific formula for obtaining the corrected well inclination angle is:

[0127]

[0128] in, The well inclination angle measured by the logging while drilling system; Tool face angle measured by the logging while drilling system; is the motor bend angle, that is, the angle between the motor axis and the axis of the LWD system.

[0129] In an optional manner, the program 910 enables the processor to perform the following operations:

[0130] The specific formula for obtaining the angle difference between the magnetic tool face angle and the gravity tool face angle is:

[0131]

[0132] in, is the angular difference; is the magnetic inclination; To correct the well inclination.

[0133] In an optional manner, after compensating the magnetic tool face angle by using the angle difference to obtain the gravity tool face angle of the rotating instrument under the continuous rotation condition, the program 910 enables the processor to perform the following operations:

[0134] The instantaneous gravity tool face angle is matched as wellbore circumferential position information and time stamp information and stored in the internal memory.

[0135] In an optional manner, the fluxgate sensor is only a dual-axis fluxgate sensor.

[0136] The solution provided by the above embodiment of the present invention uses a fluxgate sensor installed near the drill bit to measure the magnetic tool face angle of the rotating instrument; uses the well inclination angle and motor bend angle measured by the logging while drilling system to obtain the angular difference between the magnetic tool face angle and the gravity tool face angle; uses the angular difference to compensate the magnetic tool face angle to obtain the gravity tool face angle of the rotating instrument under continuous rotation. The present invention does not use an accelerometer, but converts the measurement of the gravity tool face angle into the measurement of the magnetic tool face angle, measures the magnetic tool face angle through a fluxgate sensor, and uses the angular difference between the magnetic tool face angle and the gravity tool face angle measured by the logging while drilling system to compensate the magnetic tool face angle to obtain the gravity tool face angle, thereby improving the accuracy and stability of the measurement of the near-drill bit annular well position information while drilling.

[0137] An embodiment of the present invention provides a non-volatile computer storage medium, wherein the computer storage medium stores at least one executable instruction, and the computer executable instruction can execute the method for measuring the position information of the near-bit annulus while drilling in any of the above method embodiments.

[0138] The algorithm or display provided here is not inherently related to any specific computer, virtual system or other equipment. Various general systems can also be used together with the teaching based on this. According to the above description, it is obvious to construct the structure required for this type of system. In addition, the embodiment of the present invention is not directed to any specific programming language yet. It should be understood that various programming languages ​​can be utilized to realize the content of the present invention described here, and the description of the above specific language is for disclosing the best mode of the present invention.

[0139] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0140] Similarly, it should be understood that in order to streamline the present invention and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, the various features of the embodiments of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the following intention: that the claimed invention requires more features than the features explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0141] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and further may be divided into a plurality of submodules or subunits or subcomponents. All features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device so disclosed may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0142] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0143] The various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components according to the embodiments of the present invention. The present invention may also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such a signal may be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0144] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim that lists a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be understood as limitations on the order of execution.

Claims

1. A method for measuring the position information of the vicinity of the drill bit while drilling, characterized in that: include: The magnetic tool face angle of the rotary tool is measured by using a fluxgate sensor installed near the drill bit. The well inclination angle, tool face angle and motor bend angle measured by the logging while drilling system are used to perform well inclination correction on the well inclination angle, and the corrected well inclination angle is obtained as follows: in, The well inclination angle measured by the logging while drilling system; Tool face angle measured by the logging while drilling system; is the motor bend angle, i.e. the angle between the motor axis and the axis of the logging while drilling system; According to the corrected well inclination angle, an angle difference between the magnetic tool face angle and the gravity tool face angle is obtained; The angle difference is used to compensate the magnetic tool face angle to obtain the gravity tool face angle of the rotary instrument under continuous rotation conditions.

2. The method for measuring the position information of the vicinity of the drill bit while drilling according to claim 1, characterized in that: The method of measuring the magnetic tool face angle of the rotary instrument using a fluxgate sensor installed near the drill bit further comprises: Using the fluxgate sensor to measure and filter the x-axis and y-axis components of the geomagnetic field vector on the radial cross section of the rotating instrument to obtain Hx measurement values ​​and Hy measurement values; The instantaneous magnetic tool face angle of the rotary tool is obtained according to the Hx measurement value and the Hy measurement value.

3. The method for measuring the position information of the vicinity of the drill bit while drilling according to claim 1, characterized in that: After compensating the magnetic tool face angle by using the angle difference to obtain the gravity tool face angle of the rotary instrument under continuous rotation conditions, the method further includes: The instantaneous gravity tool face angle is matched as wellbore circumferential position information and time stamp information and stored in the internal memory.

4. The method for measuring the position information of the vicinity of the drill bit while drilling according to any one of claims 1 to 3, characterized in that: The fluxgate sensor is a dual-axis fluxgate sensor.

5. A device for measuring the position information of the vicinity of the drill bit while drilling, characterized in that: include: Fluxgate sensor, strapdown mounted near the drill bit, used to measure the magnetic tool face angle of the rotating instrument; The processor is used to perform well inclination correction on the well inclination angle by using the well inclination angle, tool face angle and motor bend angle measured by the logging while drilling system, and obtain the corrected well inclination angle as follows: in, The well inclination angle measured by the logging while drilling system; Tool face angle measured by the logging while drilling system; is the motor bend angle, that is, the angle between the motor axis and the axis of the logging while drilling system; according to the corrected well inclination angle, the angular difference between the magnetic tool face angle and the gravity tool face angle is obtained; the magnetic tool face angle is compensated by using the angular difference to obtain the gravity tool face angle of the rotary instrument under continuous rotation conditions.

6. A computing device comprising: A processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform operations corresponding to the method for measuring the position information around the drill bit while drilling according to any one of claims 1-4.

7. A computer storage medium, wherein at least one executable instruction is stored in the storage medium, wherein the executable instruction enables a processor to perform operations corresponding to the method for measuring position information around a drill bit while drilling as described in any one of claims 1 to 4.

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