Double-magnetic-source signal generating device and drill bit orientation checking device and method

Abstract

The invention discloses a double-magnetic-source signal generating device and a drill bit orientation verification device and method, and relates to the technical field of drilling, and the double-magnetic-source signal generating device comprises a drill bit, a lower magnetic connector, a bent screw drill, an upper magnetic connector, a non-magnetic drill collar and a drill pipe column which are sequentially connected end to end; the driving device is arranged on the ground surface, is connected with the drill pipe column and is used for driving the drill pipe column to drive the upper magnetic connector and the non-magnetic drill collar to rotate at a first rotating speed, and the upper magnetic connector generates a low-speed magnetic line of force; the earth surface slurry pump circularly drives the rotor of the bent screw drill to rotate at a second rotating speed, the output shaft of the bent screw drill drives the lower magnetic connector and the drill bit to rotate at a third rotating speed, and the lower magnetic connector generates a rapid magnetic line of force; wherein the third rotating speed is the sum of the first rotating speed and the second rotating speed. The azimuth angle of the drill bit can be verified, and accurate butt joint of the drill bit of the directional well relative to the target position is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drilling technology, in particular to a double magnetic source signal generating device, a drill bit orientation checking device and method. BACKGROUND

[0002] In the process of interfacing well construction, the position of the drill bit of the directional well relative to the target point is determined by the rotating magnetic distance measuring method, so as to guide the drilling direction and the top angle of the drill bit. However, in the process of one-through-many (one directional well targets multiple straight wells in turn), the magnetometer is used to measure the magnetic field strength of the instrument below the interfacing straight well. Due to the vibration caused by mud circulation pulse, the measurement result of the magnetometer is affected, and then the accurate measurement of the position of the drill bit of the directional well relative to the target point is affected. SUMMARY

[0003] The purpose of the present application is to provide a double magnetic source signal generating device, a drill bit orientation checking device and method, which can check the azimuth angle of the drill bit and ensure the accurate interfacing of the drill bit of the directional well relative to the target point.

[0004] To achieve the above purpose, the present application provides the following solutions:

[0005] In a first aspect, the present application provides a double magnetic source signal generating device, comprising:

[0006] a drill bit, a lower magnetic connector, a bent screw drill tool, an upper magnetic connector, a non-magnetic drill collar and a drill pipe column connected in sequence;

[0007] a driving device arranged on the ground and connected with the drill pipe column, used to drive the drill pipe column to rotate at a first rotating speed, the upper magnetic connector generates slow magnetic lines;

[0008] a ground mud pump circulates to drive the rotor of the bent screw drill tool to rotate at a second rotating speed, the output shaft of the bent screw drill tool drives the lower magnetic connector and the drill bit to rotate at a third rotating speed, the lower magnetic connector generates fast magnetic lines; wherein the third rotating speed is the sum of the first rotating speed and the second rotating speed.

[0009] In a second aspect, the present application provides a drill bit orientation checking device, comprising: the double magnetic source signal generating device, a magnetic signal capturing mechanism and a calculation unit described above;

[0010] The double magnetic source signal generating device is used to generate double magnetic source signals; the double magnetic source signals include slow magnetic lines and fast magnetic lines; the double magnetic source signals act on the target point of the interfacing straight well;

[0011] The magnetic signal capturing mechanism is arranged in the interfacing straight well and is used to capture the magnetic field strength generated by the double magnetic source signals at the target point of the interfacing straight well;

[0012] The calculation unit, connected to the magnetic signal acquisition mechanism, is used to receive the magnetic field strength and verify the azimuth angle of the drill bit in the dual magnetic source signal generator based on the magnetic field strength.

[0013] Furthermore, the magnetic signal acquisition mechanism includes a measuring section, a magnetometer, and a connecting device; the magnetometer is disposed in the measuring section, and the measuring section is connected to the computing unit through the connecting device;

[0014] The measuring section is used to measure the angles between the spatial coordinate system of the magnetometer and the x-axis, y-axis, and z-axis of the magnetic north coordinate system; the magnetometer is used to capture the magnetic field strength; the connecting device is used to send the angles and the magnetic field strength to the computing unit, wherein the magnetic north coordinate system has the target point as the origin, the x-axis as the geomagnetic north pole, the y-axis as the direction of gravity, and the z-axis is perpendicular to the x-axis and y-axis.

[0015] Furthermore, the computing unit includes:

[0016] The drill bit azimuth measurement module is used to obtain the azimuth and apex angle of the drill bit.

[0017] A matrix generation module is used to calculate a transformation matrix based on the included angle, the azimuth angle, and the vertex angle.

[0018] The position coordinate calculation module is used to calculate the position coordinates of the upper magnetic connector and the lower magnetic connector in the magnetic north coordinate system based on the magnetic field strength and the transformation matrix;

[0019] The relative distance calculation module is used to calculate the relative distance between the lower magnetic connector and the upper magnetic connector based on their position coordinates in the magnetic north coordinate system.

[0020] The verification module is used to verify the azimuth angle of the drill bit based on the relative distance.

[0021] Thirdly, this application provides a drill bit orientation verification method, which is applied to any of the drill bit orientation verification devices described above, and the drill bit orientation verification method includes:

[0022] Acquire dual magnetic source signals; the dual magnetic source signals include slow magnetic field lines and fast magnetic field lines;

[0023] The magnetic field strength generated by the dual magnetic source signals at the target point of the docking vertical well is obtained;

[0024] The azimuth angle of the drill bit in the dual magnetic source signal generator is verified based on the magnetic field strength.

[0025] Furthermore, the azimuth angle of the drill bit in the dual magnetic source signal generator is verified based on the magnetic field strength, including:

[0026] Obtain the azimuth and apex angle of the drill bit;

[0027] The transformation matrix is ​​calculated based on the angles between the x-axis, y-axis, and z-axis of the spatial coordinate system where the magnetometer in the magnetic signal acquisition mechanism is located and the magnetic north coordinate system, as well as the azimuth angle and the vertex angle; wherein, the magnetic north coordinate system has the target point as the origin, the x-axis as the geomagnetic north pole, the y-axis as the direction of gravity, and the z-axis as perpendicular to the x-axis and y-axis;

[0028] Calculate the position coordinates of the upper and lower magnetic connectors in the magnetic north coordinate system based on the magnetic field strength and the transformation matrix;

[0029] The relative distance between the lower magnetic connector and the upper magnetic connector is calculated based on their position coordinates in the magnetic north coordinate system.

[0030] The azimuth angle of the drill bit is verified based on the relative distance.

[0031] Furthermore, the expression for the transformation matrix is:

[0032]

[0033] Where A is the transformation matrix, a, b, and c are the angles between the x, y, and z axes of the spatial rectangular coordinate system where the measurement section is located and the magnetic north coordinate system, respectively, and α0 is the drill bit's apex angle. This is the azimuth angle of the drill bit.

[0034] Further, calculating the position coordinates of the upper and lower magnetic connectors in the magnetic north coordinate system in the dual magnetic source signal generator based on the magnetic field strength and the transformation matrix includes:

[0035] The transformed magnetic field strength is obtained by transforming the magnetic field strength according to the transformation matrix.

[0036] The position coordinates of the lower and upper magnetic joints in the magnetic north coordinate system are calculated based on the transformed magnetic field strength and magnetic field strength distribution mathematical model.

[0037] Furthermore, based on the transformed magnetic field strength and magnetic field strength distribution mathematical model, the position coordinates of the lower and upper magnetic joints in the magnetic north coordinate system are calculated, including:

[0038] The position coordinates of the lower magnetic connector and the upper magnetic connector in the magnetic space coordinate system are obtained based on the transformed magnetic field strength and magnetic field strength distribution mathematical model.

[0039] The position coordinates of the lower and upper magnetic connectors in the magnetic space coordinate system are transformed using a transformation matrix to obtain their position coordinates in the magnetic north coordinate system.

[0040] Furthermore, the mathematical model for the magnetic field intensity distribution is expressed as follows:

[0041]

[0042] Where F(x,y,z) is the mathematical model of magnetic field intensity distribution, (x,y,z) is a point in a magnetic space rectangular coordinate system established with the magnetic source as the centroid, μ is the permeability, M is the magnetic moment value, and B' x B' y B' z These are the components of the magnetic field strength at position (x, y, z) along the three axes in the magnetic space rectangular coordinate system.

[0043] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0044] This application provides a dual magnetic source signal generating device, a drill bit azimuth verification device, and a method. The dual magnetic source signal generating device has a lower magnetic connector between the drill bit and the bent screw drill string, and an upper magnetic connector between the bent screw drill string and the non-magnetic drill collar. During construction, the lower and upper magnetic connectors rotate at different speeds to generate corresponding fast and slow magnetic lines of force, forming a dual magnetic source signal. The magnetic field strength generated by the dual magnetic source signal at the target point is used to verify the azimuth angle of the drill bit in the dual magnetic source signal generating device, which can determine whether the position of the drill bit and the target point in the directional well is accurate, thereby ensuring that the drill bit and the target point in the directional well are precisely aligned. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of a drill bit orientation verification device according to an embodiment of this application;

[0047] Figure 2 This is an application environment diagram of a drill bit orientation verification method according to an embodiment of this application;

[0048] Figure 3 A flowchart illustrating a drill bit orientation verification method provided in another embodiment of this application;

[0049] Figure 4 This is a schematic diagram showing the relative positions of an upper magnetic connector, a lower magnetic connector, and a magnetometer, provided in an embodiment of this application. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] In one exemplary embodiment, such as Figure 1 As shown, this application provides a dual magnetic source signal generating device, which includes a drill bit 1, a lower magnetic connector 2, a bent screw drill string 3, an upper magnetic connector 4, a non-magnetic drill collar 5, and a drill string 6 connected end to end, and connected by a male and female joint rotating shoulder. The drill bit 1, lower magnetic connector 2, bent screw drill string 3, upper magnetic connector 4, and non-magnetic drill collar 5 form a coaxial line of the bottom hole drilling tool, thereby forming a bottom hole drilling tool assembly axis 7.

[0053] A dual magnetic source signal generator is lowered into the bottom of the directional well 8. The drill string 6 and the drive device installed on the surface drive the drill string 6 to rotate the upper magnetic connector 4 and the non-magnetic drill collar 5 at a first rotational speed. The upper magnetic connector 4 generates slow magnetic lines of force. The drive device is either a surface rotary table or a top-drive drilling device.

[0054] The surface mud pump circulates and drives the rotor of the bent screw drill 3 to rotate at a second speed relative to the stator of the bent screw drill 3. The output shaft of the bent screw drill 3 drives the lower magnetic joint 2 and the drill bit 1 to rotate at a third speed. The lower magnetic joint 2 generates rapid magnetic lines of force. The third speed is the sum of the first speed and the second speed.

[0055] The surface mud pump is driven by an engine to move its piston cylinder, converting mechanical energy into hydraulic energy of the flowing mud, which drives the mud to circulate. The flowing mud flows through the channel in the drill string 6 to the upper joint of the bent screw drill bit 3. The upper joint of the bent screw drill bit 3 is connected to the sealed chamber formed by the stator and rotor of the bent screw drill bit 3. The flowing mud enters the sealed chamber through the upper joint of the bent screw drill bit 3, driving the rotor of the bent screw drill bit 3 to rotate around its own axis.

[0056] The dual magnetic source signal generator in this application generates dual magnetic signals, which include slow magnetic field lines and fast magnetic field lines.

[0057] In one exemplary embodiment, see further. Figure 1 ,like Figure 1 As shown, this application provides a drill bit orientation verification device, which includes the aforementioned dual magnetic source signal generator, magnetic signal capture mechanism, and calculation unit 9.

[0058] After the dual magnetic source signal generator is lowered to the bottom of the directional well 8, the dual magnetic signals act on the target point of the docking vertical well 10. The magnetic signal capture mechanism is installed in the docking vertical well 10 to capture the magnetic field strength generated by the dual magnetic source signals at the target point of the docking vertical well 10.

[0059] like Figure 1 As shown, the magnetic signal acquisition mechanism includes a measuring sub 11, a magnetometer 12, and a connecting device. The connecting device includes an armored cable 13, a wellhead pulley 14, and a logging winch 15.

[0060] Magnetometer 12 is installed in the measuring section 11 and is placed at the target point in the docking vertical well 10 via a connecting device. Magnetometer 12 can capture the magnetic field strength generated at the target point by the dual magnetic source signal and send the captured magnetic field strength to the measuring section 11.

[0061] The measuring section 11 is connected to the computing unit 9 via the connecting device. The measuring section 11 measures the angles between the spatial coordinate system of the magnetometer 12 and the x-axis, y-axis, and z-axis of the magnetic north coordinate system. The magnetic north coordinate system has the target point as its origin, the x-axis as the geomagnetic north pole, the y-axis as the direction of gravity, and the z-axis perpendicular to both the x-axis and y-axis. The measuring section 11 transmits the measured angles and the magnetic field strength captured by the magnetometer 12 to the connecting device, which then transmits these parameters to the computing unit 9.

[0062] The armored cable 13 in the connecting device is wound around the body of the logging winch 15. A wellhead pulley 14 is located at the wellhead of the docking vertical well 10, and the logging winch 15 is positioned on the ground. One end of the armored cable 13 passes through the wellhead pulley 14 and connects to the measuring sub 11, while the other end of the armored cable 13 connects to the calculation unit 9. The armored cable 13 transmits the included angle and the magnetic field strength to the calculation unit 9. The logging winch 15 is used to adjust the length of the armored cable 13, thereby adjusting the position of the measuring sub 11 in the docking vertical well 10.

[0063] The calculation unit 9 receives the magnetic field strength captured by the magnetometer 12 in the magnetic signal capture mechanism, and verifies the azimuth angle of the drill bit 1 in the dual magnetic source signal generator based on the magnetic field strength. The calculation unit 9 can be a personal computer (PC).

[0064] In another exemplary embodiment of this application, the calculation unit 9 includes a drill bit orientation measurement module 91, a matrix generation module 92, a position coordinate calculation module 93, a relative distance calculation module 94, and a verification module 95.

[0065] The drill bit azimuth measurement module 91 is used to obtain the azimuth and apex angle of the drill bit.

[0066] The matrix generation module 92 is used to calculate the transformation matrix based on the included angle, the azimuth angle, and the vertex angle.

[0067] The position coordinate calculation module 93 is used to calculate the position coordinates of the upper magnetic connector and the lower magnetic connector in the magnetic north coordinate system based on the magnetic field strength and the transformation matrix.

[0068] The relative distance calculation module 94 is used to calculate the relative distance between the lower magnetic connector and the upper magnetic connector based on their position coordinates in the magnetic north coordinate system.

[0069] Verification module 95 is used to verify the azimuth angle of the drill bit based on the relative distance.

[0070] The drill bit orientation verification device provided in this application measures the magnetic field strength generated by dual magnetic signals at target point 10 of the docking vertical well, and obtains the relative distance between the lower magnetic joint and the upper magnetic joint based on the magnetic field strength. The azimuth angle of the drill bit is verified by using the relative distance, which can improve the docking accuracy.

[0071] The drill bit orientation verification method provided in this application embodiment can be applied to, for example... Figure 2In the application environment shown, terminal 102 communicates with server 104 via a network. A data storage system can store the data that server 104 needs to process. The data storage system can be set up independently, integrated into server 104, or placed in the cloud or on another server. Terminal 102 can send the acquired magnetic field strength to server 104. After receiving the magnetic field strength, server 104 verifies the azimuth angle of the drill bit in the dual-magnetic-source signal generator based on the magnetic field strength. Server 104 can then feed back the verification result of the drill bit azimuth angle to terminal 102. Furthermore, in some embodiments, the drill bit azimuth verification method can be implemented independently by server 104 or terminal 102. For example, terminal 102 can directly perform drill bit azimuth verification based on the magnetic field strength, or server 104 can obtain the magnetic field strength from the data storage system and perform drill bit azimuth verification.

[0072] The terminal 102 can be, but is not limited to, various desktop computers, laptops, smartphones, and tablets. The server 104 can be implemented using a standalone server or a server cluster consisting of multiple servers, or it can be a cloud server.

[0073] In one exemplary embodiment, such as Figure 3 As shown, a drill bit orientation verification method is provided. This method is executed by a computer device, specifically by a terminal or server alone, or by both a terminal and a server. The drill bit orientation verification method is applied to any of the drill bit orientation verification devices described above. The drill bit orientation verification method includes steps 101-103:

[0074] Step 101: Obtain dual magnetic source signals; the dual magnetic source signals include slow magnetic field lines and fast magnetic field lines.

[0075] Step 102: Obtain the magnetic field strength generated by the dual magnetic source signal at the target point of the docking vertical well.

[0076] Step 103: Verify the azimuth angle of the drill bit in the dual magnetic source signal generator based on the magnetic field strength.

[0077] In another exemplary embodiment of this application, step 103 verifies the azimuth angle of the drill bit in the dual magnetic source signal generator based on the magnetic field strength, specifically including steps 201-205:

[0078] Step 201: Obtain the azimuth and apex angle of the drill bit.

[0079] Specifically, the apex angle α0 and azimuth angle of the bottom hole drill string assembly axis 7 were measured using a measurement-while-drilling instrument. Let the vertex angle α0 and the azimuth angle be... The mud pulse signal is sent to the surface pressure sensor. The surface work machine analysis module of the measurement while drilling system processes the mud pulse signal received by the surface pressure sensor to obtain the circulating mud pressure transformation curve. Based on the circulating mud pressure transformation curve, the apex angle α0 and azimuth angle are obtained. Finally, the apex angle α0 and azimuth angle were measured using the measurement-while-drilling system. It is sent to computing unit 9.

[0080] The apex angle is the angle between the bottom hole drill string assembly axis 7 and the vertical direction, and the azimuth angle is the angle between the projection of the bottom hole drill string assembly axis 7 onto the horizontal plane and the magnetic north direction. The straight line containing the axis of drill bit 1 coincides with the straight line containing the bottom hole drill string assembly axis 7, therefore the apex angle α0 and the azimuth angle of the bottom hole drill string assembly axis 7 are... That is, the apex angle and azimuth angle of drill bit 1.

[0081] like Figure 4 As shown, O1 is the position of the lower magnetic connector 2, O2 is the position of the upper magnetic connector 4, and O is the position of the magnetometer 12, i.e., the target point for docking with the vertical well 10. The straight line containing O1 and O2 is the straight line containing the bottom hole drill string assembly axis 7. The apex angle α0 and azimuth angle are measured using a measurement-while-drilling instrument. And the vertex angle α0 and azimuth angle Send to computing unit 9.

[0082] Step 202: Calculate the transformation matrix based on the angles between the spatial coordinate system of the magnetometer 12 in the magnetic signal acquisition mechanism and the x-axis, y-axis, and z-axis of the magnetic north coordinate system, the azimuth angle, and the apex angle; wherein the magnetic north coordinate system has the target point as the origin, the x-axis as the geomagnetic north pole, the y-axis as the direction of gravity, and the z-axis as perpendicular to the x-axis and y-axis.

[0083] The expression for the transformation matrix is:

[0084]

[0085] Where A is the transformation matrix, a, b, and c are the angles between the x, y, and z axes of the Cartesian coordinate system where magnetometer 12 is located and the magnetic north coordinate system, respectively, and α0 is the apex angle of drill bit 1. The azimuth angle of drill bit 1.

[0086] Step 203: Calculate the position coordinates of the upper magnetic connector 4 and the lower magnetic connector 2 in the magnetic north coordinate system based on the magnetic field strength and the transformation matrix.

[0087] The magnetic field strength includes the magnetic field strength generated by the combined action of slow and fast magnetic field lines at the target point. Using frequency domain filtering techniques, the historical data of the captured magnetic field strength is analyzed using a spectrum diagram to determine the two dominant frequencies f1 and f2 (f1 > f2) in the spectrum. Then, the magnetic field strengths B1 and B2 corresponding to frequencies f1 and f2 are obtained through filtering.

[0088] B1(B1 x B1 y B1 z B2 is the magnetic field strength of the rapidly rotating magnetic field lines generated by the lower magnetic connector 2 in the rectangular coordinate system of the space where the magnetometer 12 is located. x B2 y B2 z B1 represents the magnetic field strength of the slow magnetic lines of force generated by the rotation of the upper magnetic connector 4 in the rectangular coordinate system of the space where the magnetometer 12 is located. x B1 y B1 z These represent the components of magnetic field strength B1 along the three axes of the Cartesian coordinate system where magnetometer 12 is located; B2 x B2 y B2 z Let B2 be the components of the magnetic field strength B2 along the three axes of the Cartesian coordinate system where magnetometer 12 is located.

[0089] The magnetic field strengths B1 and B2 are transformed using the transformation matrix to obtain the transformed magnetic field strengths B1 and B2.

[0090] Specifically, the transformed magnetic field strengths B1 and B2 are obtained using formula (2), as follows:

[0091] [B′ x ;B′ y ;B' z ] = A -1 [B x B y B z (2)

[0092] Among them, B' x B' y B' z B represents the three components of the transformed magnetic field strength. x B y B z The components of the three axes in the Cartesian coordinate system in which the magnetometer 12 is located.

[0093] After obtaining the transformed magnetic field strengths B1 and B2, the position coordinates (x'1, y'1, z'1) of the lower magnetic connector 2 and the position coordinates (x'2, y'2, z'2) of the upper magnetic connector 4 in the magnetic space coordinate system are calculated using a mathematical model of magnetic field strength distribution. The specific calculation process includes:

[0094] When calculating the position coordinates (x'1, y'1, z'1) of the lower magnetic connector 2 in the magnetic space coordinate system, the permeability μ1, magnetic moment M1, and converted magnetic field strength B1 of the lower magnetic connector 2 are considered. x B1 y B1 z Substituting into the mathematical model of magnetic field intensity distribution and solving for F(x,y,z)=0, we obtain x'1, y'1, z'1. (x'1, y'1, z'1) are the position coordinates of the lower magnetic connector 2 in the magnetic space coordinate system.

[0095] Where (x'1, y'1, z'1) are the position coordinates of the lower magnetic connector 2 in the magnetic space coordinate system constructed with the centroid of the lower magnetic connector 2 as the origin. The x-axis of the magnetic space coordinate system is the straight line where the rotation axis of the lower magnetic connector 2 is located, the y-axis is perpendicular to the x-axis and lies in the horizontal plane, and the z-axis is perpendicular to both the y-axis and the x-axis.

[0096] When calculating the position coordinates (x'2, y'2, z'2) of the upper magnetic connector 4 in the magnetic space coordinate system, the permeability μ2, magnetic moment M2, and the converted magnetic field strength B2 of the upper magnetic connector 4 are considered. x B2 y B2 z Substituting into the mathematical model of magnetic field intensity distribution and solving for F(x,y,z)=0, we obtain x'2, y'2, z'2. (x'2, y'2, z'2) are the position coordinates of the upper magnetic connector 14 in the magnetic space coordinate system.

[0097] Where (x'2, y'2, z'2) are the position coordinates of the upper magnetic connector 14 in the magnetic space coordinate system constructed with the centroid of the upper magnetic connector 4 as the origin. The x-axis of the magnetic space coordinate system is the straight line where the rotation axis of the upper magnetic connector 4 is located, the y-axis is perpendicular to the x-axis and lies in the horizontal plane, and the z-axis is perpendicular to both the y-axis and the x-axis.

[0098] The mathematical model for magnetic field intensity distribution is expressed as follows:

[0099]

[0100] Where F(x,y,z) is the mathematical model of magnetic field intensity distribution, (x,y,z) is a point in a magnetic space rectangular coordinate system established with the magnetic source as the centroid, μ is the permeability, M is the magnetic moment value, and B' x B'y B' z These are the components of the magnetic field strength at position (x, y, z) along the three axes in the magnetic space rectangular coordinate system.

[0101] After obtaining the position coordinates (x'2, y'2, z'2) of the upper magnetic connector 4 and the position coordinates (x'1, y'1, z'1) of the lower magnetic connector 2 in the magnetic space coordinate system, the position coordinates of the upper magnetic connector 4 and the lower magnetic connector 2 in the magnetic space coordinate system are transformed using a transformation matrix to obtain the coordinate positions (x1, y1, z1) of the upper magnetic connector 4 and (x2, y2, z2) of the lower magnetic connector 2 in the magnetic north coordinate system. Specifically, the transformation is performed using formula (4), which is as follows:

[0102]

[0103] Where (x, y, z) are the position coordinates in the magnetic north coordinate system, and (x', y', z') are the position coordinates in the magnetic space coordinate system. The magnetic north coordinate system has the target point as the origin, the x-axis as the geomagnetic north pole, the y-axis as the direction of gravity, and the z-axis as perpendicular to the x-axis and y-axis.

[0104] Step 204: Calculate the relative distance between the lower magnetic connector 4 and the upper magnetic connector 2 based on their position coordinates in the magnetic north coordinate system.

[0105] Specifically, the relative distance between the lower magnetic connector 2 and the upper magnetic connector 4 is calculated using formula (5), which is as follows:

[0106]

[0107] Where r0 is the relative distance between the lower magnetic connector 2 and the upper magnetic connector 4.

[0108] Step 205: Verify the azimuth angle of the drill bit 1 based on the relative distance.

[0109] Specifically, the azimuth angle of the drill bit is verified using the relative distance r0 between the lower magnetic connector 2 and the upper magnetic connector 4 and the actual distance L. L is the actual distance between the lower magnetic connector 2 and the upper magnetic connector 4, which is obtained through surface measurement.

[0110] If the difference between the relative distance r0 and the actual distance L is less than or equal to 5%, it indicates that the azimuth of drill bit 1 meets the construction requirements and can be used to guide the docking target point to continue construction. If the difference between the relative distance r0 and the actual distance L is greater than 5%, it indicates that the azimuth error of drill bit 1 is relatively large and does not meet the construction requirements, and it needs to be remeasured.

[0111] In another exemplary embodiment of this application, the position coordinates of the upper magnetic connector and the lower magnetic connector in the magnetic north coordinate system in the dual magnetic source signal generator are calculated based on the magnetic field strength and the transformation matrix, including steps 301-302:

[0112] Step 301: Convert the magnetic field strength according to the conversion matrix to obtain the converted magnetic field strength.

[0113] Step 302: Calculate the position coordinates of the lower and upper magnetic joints in the magnetic north coordinate system based on the transformed magnetic field strength and magnetic field strength distribution mathematical model.

[0114] Specifically, the position coordinates of the lower and upper magnetic connectors in the magnetic space coordinate system are obtained based on the transformed magnetic field strength and magnetic field strength distribution mathematical model. Then, the position coordinates of the lower and upper magnetic connectors in the magnetic space coordinate system are transformed using a transformation matrix to obtain their position coordinates in the magnetic north coordinate system.

[0115] In another exemplary embodiment of this application, a close distance is defined as the distance between the drill bit 1 and the magnetometer 12 being less than or equal to 10m. When the drill bit 1 is at close distance, the relative distance S between the drill bit 1 and the magnetometer 12 is calculated using the following method.

[0116] Based on the position coordinates (x2, y2, z2) of the upper magnetic connector 4 relative to the magnetic north coordinate system with the target point as the origin, it can be known that the spatial line segment vector The three components are (x2, y2, z2); O1O2 is collinear with the bottom hole drill string assembly axis 7, therefore, the angle between O1O2 and the vertical direction is the vertex angle α0, and the angle between the projection of O1O2 on the horizontal plane and the magnetic north direction is the azimuth angle.

[0117] The actual distance between O1 and O2 is known to be L based on surface measurements, and the coordinates of O2 are represented as follows: In this case, a magnetic north rectangular coordinate system with O1 as the origin is constructed, and the coordinates of O2 are the coordinate positions of O2 in the spherical coordinate system relative to the magnetic north rectangular coordinate system with O1 as the origin.

[0118] spherical coordinate system The transformation relationship with the rectangular coordinate system (x, y, z) is as follows: z = rcosα, where (x, y, z) is a point in a rectangular coordinate system, and (r, α, z) is a point in a rectangular coordinate system. Let be a point in the spherical coordinate system.

[0119] coordinates O2 Substituting the above transformation relationship, we obtain the spatial line segment vector. The three components are Therefore, spatial line segment vectors The three components are According to spatial line segment vectors The distance S between the drill bit and the magnetometer can be obtained from the three components. The calculation formula is:

[0120]

[0121] At close range, the distance between the drill bit 1 and the magnetometer 12 is calculated by using the alternating magnetic source signal formed by the upper magnetic connector 4 set between the bent screw drill bit 3 and the non-magnetic drill collar 5. This calculation method is accurate and convenient, and can better guide the docking work.

[0122] This application obtains the magnetic field strength generated by dual magnetic signals at target point 10 of the docking vertical well, and determines the relative distance between the upper and lower magnetic joints based on the magnetic field strength. The azimuth angle of drill bit 1 is verified by using the relative distance and the actual distance between the upper and lower magnetic joints, which can provide directional guidance for docking construction and improve docking accuracy.

[0123] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0124] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A dual-magnetic-source signal generator, characterized in that, The dual magnetic source signal generating device includes: a drill bit, a lower magnetic connector, a bent screw drill bit, an upper magnetic connector, a non-magnetic drill collar, and a drill string connected in sequence from end to end; A drive device installed on the ground surface is connected to the drill string and is used to drive the drill string to rotate the upper magnetic connector and the non-magnetic drill collar at a first rotation speed. The upper magnetic connector generates slow magnetic lines of force. The surface mud pump circulates and drives the rotor of the bent screw drill to rotate at a second speed. The output shaft of the bent screw drill drives the lower magnetic connector and the drill bit to rotate at a third speed. The lower magnetic connector generates rapid magnetic lines of force. The third speed is the sum of the first speed and the second speed.

2. A drill bit orientation verification device, characterized in that, include: The dual magnetic source signal generator, magnetic signal acquisition mechanism, and computing unit as described in claim 1; A dual magnetic source signal generator is used to generate dual magnetic source signals; the dual magnetic source signals include slow magnetic field lines and fast magnetic field lines; the dual magnetic source signals are applied to the target point of the docking vertical well; The magnetic signal capture mechanism is installed in the docking vertical well and is used to capture the magnetic field strength generated by the dual magnetic source signal at the target point of the docking vertical well. The calculation unit, connected to the magnetic signal acquisition mechanism, is used to receive the magnetic field strength and verify the azimuth angle of the drill bit in the dual magnetic source signal generator based on the magnetic field strength.

3. The drill bit orientation verification device according to claim 2, characterized in that, The magnetic signal acquisition mechanism includes a measuring section, a magnetometer, and a connecting device; the magnetometer is disposed in the measuring section, and the measuring section is connected to the computing unit through the connecting device; The measuring section is used to measure the angles between the spatial coordinate system where the magnetometer is located and the x-axis, y-axis, and z-axis of the magnetic north coordinate system; the magnetometer is used to capture the magnetic field strength; the connecting device is used to send the angles and the magnetic field strength to the computing unit; wherein, the magnetic north coordinate system has the target point as the origin, the x-axis as the geomagnetic north pole, the y-axis as the direction of gravity, and the z-axis is perpendicular to the x-axis and y-axis.

4. The drill bit orientation verification device according to claim 3, characterized in that, The computing unit includes: The drill bit azimuth measurement module is used to obtain the azimuth and apex angle of the drill bit. A matrix generation module is used to calculate a transformation matrix based on the included angle, the azimuth angle, and the vertex angle. The position coordinate calculation module is used to calculate the position coordinates of the upper magnetic connector and the lower magnetic connector in the magnetic north coordinate system based on the magnetic field strength and the transformation matrix; The relative distance calculation module is used to calculate the relative distance between the lower magnetic connector and the upper magnetic connector based on their position coordinates in the magnetic north coordinate system. The verification module is used to verify the azimuth angle of the drill bit based on the relative distance.

5. A method for verifying the orientation of a drill bit, characterized in that, The drill bit orientation verification method is applied to the drill bit orientation verification device according to any one of claims 2-4, and the drill bit orientation verification method includes: Acquire dual magnetic source signals; the dual magnetic source signals include slow magnetic field lines and fast magnetic field lines; The magnetic field strength generated by the dual magnetic source signals at the target point of the docking vertical well is obtained; The azimuth angle of the drill bit in the dual magnetic source signal generator is verified based on the magnetic field strength.

6. The drill bit orientation verification method according to claim 5, characterized in that, Verification of the azimuth angle of the drill bit in the dual magnetic source signal generator based on the magnetic field strength includes: Obtain the azimuth and apex angle of the drill bit; The transformation matrix is ​​calculated based on the angles between the x-axis, y-axis, and z-axis of the spatial coordinate system where the magnetometer in the magnetic signal acquisition mechanism is located and the magnetic north coordinate system, as well as the azimuth angle and the vertex angle; wherein, the magnetic north coordinate system has the target point as the origin, the x-axis as the geomagnetic north pole, the y-axis as the direction of gravity, and the z-axis as perpendicular to the x-axis and y-axis; Calculate the position coordinates of the upper and lower magnetic connectors in the magnetic north coordinate system based on the magnetic field strength and the transformation matrix; The relative distance between the lower magnetic connector and the upper magnetic connector is calculated based on their position coordinates in the magnetic north coordinate system. The azimuth angle of the drill bit is verified based on the relative distance.

7. The drill bit orientation verification method according to claim 6, characterized in that, The expression for the transformation matrix is: Where A is the transformation matrix, a, b, and c are the angles between the x, y, and z axes of the spatial rectangular coordinate system where the measurement section is located and the magnetic north coordinate system, respectively, and α0 is the drill bit's apex angle. This is the azimuth angle of the drill bit.

8. The drill bit orientation verification method according to claim 6, characterized in that, Calculate the position coordinates of the upper and lower magnetic connectors in the magnetic north coordinate system based on the magnetic field strength and the transformation matrix, including: The transformed magnetic field strength is obtained by transforming the magnetic field strength according to the transformation matrix. The position coordinates of the lower and upper magnetic joints in the magnetic north coordinate system are calculated based on the transformed magnetic field strength and magnetic field strength distribution mathematical model.

9. The drill bit orientation verification method according to claim 8, characterized in that, The position coordinates of the lower and upper magnetic joints in the magnetic north coordinate system are calculated based on the transformed magnetic field strength and magnetic field strength distribution mathematical model, including: The position coordinates of the lower magnetic connector and the upper magnetic connector in the magnetic space coordinate system are obtained based on the transformed magnetic field strength and magnetic field strength distribution mathematical model. The position coordinates of the lower and upper magnetic connectors in the magnetic space coordinate system are transformed using a transformation matrix to obtain their position coordinates in the magnetic north coordinate system.

10. The drill bit orientation verification method according to claim 9, characterized in that, The mathematical model for the magnetic field intensity distribution is expressed as follows: Where F(x,y,z) is the mathematical model of magnetic field intensity distribution, (x,y,z) is a point in a magnetic space rectangular coordinate system established with the magnetic source as the centroid, μ is the permeability, M is the magnetic moment value, and B' x B' y B' z These are the components of the magnetic field strength at position (x, y, z) along the three axes in the magnetic space rectangular coordinate system.

Images