Simulation device and simulation method of passive active magnetic detection steering drilling instrument

Abstract

The invention discloses a simulation device and a simulation method of a passive active magnetic detection guiding drilling instrument. The device comprises a magnetic field excitation system, a stratum lithology simulation system, an old well simulation system and a new well detection simulation system. The old well simulation system is movable and comprises an old well simulation drilling tool, and the inclination angle of the old well simulation drilling tool is adjustable. The magnetic field excitation system is used for outputting a magnetic excitation signal to the old well simulation drilling tool through the stratum lithology simulation system, so that the old well simulation drilling tool generates a magnetic induction signal; and the new well detection simulation system is movably arranged around the old well simulation system, comprises a measuring probe and is used for detecting and simulating magnetic induction signals generated by the old well drilling tool, and the inclination angle can be adjusted. Simulation measurement of the passive active magnetic detection guiding drilling instrument can be achieved, the reliability of a two-well magnetic field model, a calculation method, excitation equipment and a detection instrument and the like formed through verification and research are verified, the research and development efficiency is improved, and meanwhile evaluation and testing of research results are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of logging, and particularly relates to a simulation device and a simulation method for a passive active magnetic detection guided drilling instrument. Background Art

[0002] For accident well rescue, precise two-well guiding and connecting technology is urgently needed. In case of major accidents such as out-of-control well blowout and fire, the original wellhead cannot be used. It is necessary to drill a new rescue well near the original well, connect with the old well underground, establish an accident treatment channel, and effectively handle the accident. The existing guiding measurement tools have insufficient functions and performance, and cannot achieve precise connection between the rescue well and the accident well. It is necessary to use high-precision magnetic detection and guiding instruments to guide the rescue well accordingly.

[0003] For plugging complex old wells in gas storage reservoirs, precise guiding wellbore re-entry technology is urgently needed. Currently, in the guiding drilling operation of old well re-entry, when the distance between two wells is far, a passive active magnetic detection guided drilling instrument is usually used. Its principle is to lower an excitation power supply and a detection instrument into a new well through a cable, measure the magnetic induction generated by the drill string in the target old well, and locate the distance and azimuth between the two wells, so as to realize guiding the new wellbore to re-enter and connect with the target old wellbore.

[0004] Whether in the theoretical algorithm stage or the physical research and development stage of the passive active magnetic detection guided drilling instrument, in order to verify its reliability and accuracy, a large number of simulation tests are required for verification and correction. Currently, there is a lack of equipment and instruments for experiments, a feasible evaluation scheme, and experimental equipment and instruments, which seriously affect the progress of related research. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a simulation device and a simulation method for a passive active magnetic detection guided drilling instrument that can overcome or at least partially solve the above problems.

[0006] In a first aspect, an embodiment of the present invention provides a simulation device for a passive active magnetic detection guided drilling instrument, including: a magnetic field excitation system, a formation lithology simulation system, an old well simulation system, and a new well detection simulation system;

[0007] The magnetic field excitation system, the formation lithology simulation system, and the old well simulation system are electrically connected in sequence;

[0008] The old well simulation system is movable and includes a simulated old well drill string, and the inclination angle of the simulated old well drill string is adjustable;

[0009] The magnetic field excitation system is configured to output a magnetic excitation signal to the simulated old well drill string in the old well simulation system through the formation lithology simulation system, so that the simulated old well drill string generates a magnetic induction signal;

[0010] The new well detection simulation system is movably arranged around the old well simulation system, and includes a measurement probe for detecting the magnetic induction signal generated by the simulated old well drill in the old well detection simulation system, and the inclination angle of the measurement probe is adjustable.

[0011] In one embodiment, the magnetic field excitation system includes: a frequency converter and a rheostat connected in series;

[0012] The frequency converter is used to provide the voltage, current and frequency required for magnetic field excitation;

[0013] The rheostat is used to adjust the current of the magnetic field excitation.

[0014] In one embodiment, the formation lithology simulation system includes: a formation lithology simulation box for accommodating the formation rock samples required for simulation tests;

[0015] One end of the lithology simulation box is electrically connected to the magnetic field excitation system, and the other end is electrically connected to the simulated old well drill in the old well simulation system; and after the formation rock samples are placed, the formation rock samples are respectively electrically connected to the magnetic field excitation system and the simulated old well drill.

[0016] In one embodiment, the formation lithology simulation system further includes: an incoming ammeter and an outgoing ammeter;

[0017] The incoming ammeter and the outgoing ammeter are respectively used to display the excitation current in the incoming direction and the outgoing direction.

[0018] In one embodiment, the old well simulation system further includes: an adjustable angle simulation test stand;

[0019] The simulated old well drill is installed on the adjustable angle simulation test stand; the adjustable angle simulation test stand is used to adjust the inclination angle of the simulated old well drill on the adjustable angle simulation test stand, and drive the simulated old well drill to move to adjust the distance between the simulated old well drill and the measurement probe.

[0020] In one embodiment, the new well detection simulation system further includes: an adjustable angle simulation test stand;

[0021] The measurement probe is installed on the adjustable angle simulation test stand; the adjustable angle simulation test stand is used to adjust the inclination angle of the measurement probe on the adjustable angle simulation test stand, and drive the measurement probe to move to adjust the distance between the simulated old well drill and the measurement probe.

[0022] In one embodiment, the adjustable angle simulation test stand includes:

[0023] Upper plate, vertical column, slope adjustment plate, positioning plate, locking bolt, hemispherical support seat, bottom plate, pulley, ball head;

[0024] The pulley is connected to the lower end of the bottom plate;

[0025] The hemispherical support seat is arranged on the bottom plate, and the ball head is rotatably connected to the hemispherical support seat;

[0026] The ball head is connected to the simulated old well drill tool or the lower end of the measurement probe, so that the rotation of the ball head drives the simulated old well drill tool or the measurement probe to tilt at a preset angle;

[0027] The upper plate is connected to the bottom plate through a vertical column;

[0028] The slope adjustment plate and the positioning plate are located above the upper plate; the simulated old well drill tool or the measurement probe passes through the upper plate and is sleeved into the slope inclination plate, and is positioned by the positioning plate and fixed to the upper plate through a locking bolt.

[0029] In one embodiment, the slope adjustment plate is U-shaped, and the simulated old well drill tool or the measurement probe is sleeved into the U-shaped inner circle of the slope adjustment plate and abuts against the U-shaped inner circle;

[0030] The end of the slope adjustment plate is connected to the positioning plate through the locking bolt;

[0031] The upper plate is provided with a slope guiding groove, so that the lower end of the locking bolt moves in the slope guiding groove to adjust the position of the positioning plate in the horizontal direction.

[0032] In one embodiment, the new well detection simulation system further includes: a data processing system;

[0033] The data processing system is electrically connected to the measurement probe, and is used for processing and displaying the magnetic induction signals detected by the measurement probe.

[0034] In one embodiment, the simulated old well drill tool is a steel pipe.

[0035] In a second aspect, an embodiment of the present invention provides a method for experimental simulation using a simulation device of a passive active magnetic detection and guiding drilling instrument as described above, including:

[0036] Electrically connect the magnetic field excitation system, the formation lithology simulation system and the old well simulation system, and adjust the inclination angle of the simulated old well drill tool and the inclination angle of the measurement probe of the new well detection simulation system in the old well simulation system;

[0037] By moving the old well simulation system and / or the new well detection simulation system, adjust the distance between the simulated old well drill tool and the measurement probe;

[0038] Apply power to the magnetic field excitation system so that it provides an excitation electrical signal according to the preset voltage, current, and frequency.

[0039] By processing the magnetic induction signals detected by the measurement probe, analyze and calculate the distance and azimuth between the simulated old well drill tool and the measurement probe.

[0040] According to the calculated distance between the simulated old well drill tool and the measurement probe, as well as the actual distance and actual azimuth of the simulated old well drill tool and the measurement probe, conduct simulation test analysis.

[0041] The beneficial effects of the above technical solutions provided by the embodiments of the present invention at least include:

[0042] In the simulation device of the above passive active magnetic detection guided drilling instrument, both the old well simulation system and the new well detection simulation system are movable so as to adjust the distance between the measurement probe and the old well drill tool at any time. Moreover, the inclination angles of the simulated old well drill tool in the old well simulation system and the measurement probe in the new well detection simulation system are adjustable. The magnetic field excitation system gives the excitation electrical signal required for simulation measurement. The formation lithology simulation system simulates different types of cores to simulate the formation where the actual downhole detection is located. Through the transmission of the formation core, the current gathers at the simulated old well drill tool to generate an alternating magnetic field. In this way, the measurement probe can measure the changes caused by the alternating magnetic field, and then analyze and calculate the distance and azimuth between the measurement probe and the simulated old well drill tool. During the simulation measurement process, by adjusting the excitation electrical signal, replacing different simulated formations, adjusting the inclination angles of the simulated old well drill tool and the measurement probe, as well as the distance and azimuth between the two, the simulation measurement of the passive active magnetic detection guided drilling instrument can be realized. And by setting the inclination angles of the simulated old well drill tool, the measurement probe, as well as the distance and azimuth between the two, the measurement results can be tested and evaluated, the reliability of the two-well magnetic field model, calculation method, excitation equipment, and detection instrument formed by the verification research can be verified, etc., so as to improve the R & D efficiency and at the same time realize the evaluation and test of the research results.

[0043] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the written specification, claims, and drawings.

[0044] The following further describes the technical solutions of the present invention in detail through the drawings and embodiments. Brief Description of the Drawings

[0045] The accompanying drawings are used to provide a further understanding of the present invention and form a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the accompanying drawings:

[0046] Figure 1 It is a schematic structural diagram of a simulation device for a passive active magnetic detection and guidance drilling instrument in an embodiment of the present invention;

[0047] Figure 2 It is a schematic structural diagram of an adjustable angle simulation test stand in an embodiment of the present invention;

[0048] Figure 3 It is a top view of the adjustable angle simulation test stand in an embodiment of the present invention.

[0049] Explanation of reference numerals in the drawings:

[0050] 1. Magnetic field excitation system; 2. Formation lithology simulation system; 3. Old well simulation system; 4. New well detection simulation system; 5. Frequency converter; 6. Rheostat; 7. Power line; 8. Inward ammeter; 9. Formation lithology simulation box; 10. Formation rock sample; 11. Outward ammeter; 12. Simulation test stand; 13. Simulated old well drill tool; 14. Inclination adjustment plate; 15. Positioning plate; 16. Locking bolt; 17. Column; 18. Compression nut; 19. Upper plate; 20. Support nut; 21. Positioning nut; 22. Ball head; 23. Hemispherical support seat; 24. Bottom plate; 25. Pulley; 26. Measuring probe; 27. Signal line; 28. Data processing system; 29. Inclination guiding groove. Detailed implementation manners

[0051] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0052] An embodiment of the present invention provides a simulation device for a passive active magnetic detection and guidance drilling instrument. Referring to Figure 1 as shown, the device includes: a magnetic field excitation system 1, a formation lithology simulation system 2, an old well simulation system 3, and a new well detection simulation system 4; wherein:

[0053] The magnetic field excitation system 1, the formation lithology simulation system 2, and the old well simulation system 3 are electrically connected in sequence;

[0054] The old well simulation system 3 includes a simulated old well drill tool 13, and the inclination angle of the simulated old well drill tool 13 is adjustable;

[0055] A magnetic field excitation system 1 is used to output a magnetic excitation signal to a simulated old well drill tool 13 in an old well simulation system 3 through a formation lithology simulation system 2, so that the simulated old well drill tool 13 generates a magnetic induction signal.

[0056] A new well detection simulation system 4 is movably arranged around the old well simulation system 3 and includes a measurement probe 26 for detecting the magnetic induction signal generated by the simulated old well drill tool 13 in the old well simulation system 3, and the inclination angle of the measurement probe 26 is adjustable.

[0057] In the simulation device of the above passive active magnetic detection and guiding drilling instrument, both the old well simulation system 3 and the new well detection simulation system 4 are movable so as to adjust the distance between the measurement probe 26 and the simulated old well drill tool 13 at any time. Moreover, the inclination angles of the simulated old well drill tool 13 in the old well simulation system 3 and the measurement probe 26 in the new well detection simulation system 4 are adjustable. An excitation electric signal required for simulation measurement is given by the magnetic field excitation system 1. The formation lithology simulation system 2 simulates different types of cores to simulate the formation where the actual downhole detection is located. Through the transmission of the formation core, current accumulates at the simulated old well drill tool to generate an alternating magnetic field. In this way, the measurement probe 26 can measure the changes caused by the alternating magnetic field, and then analyze and calculate the distance and azimuth between the measurement probe 26 and the simulated old well drill tool 13. During the simulation measurement process, by adjusting the excitation electric signal, replacing different simulated formations, adjusting the inclination angles of the simulated old well drill tool 13 and the measurement probe 26, as well as the distance and azimuth between the two, the simulation measurement of the passive active magnetic detection and guiding drilling instrument can be realized. And by setting the inclination angle of the simulated old well drill tool 13, the inclination angle of the measurement probe 26, and the distance and azimuth between the two, the measurement results can be tested and evaluated. The embodiment of the present invention can calculate the distance and azimuth between the simulated old well drill tool 13 and the measurement probe 26 according to the induction signal detected by the measurement probe 26 under any excitation condition, and through comparison and analysis with the known distance and azimuth between the two, verify and study the reliability of the two-well magnetic field model, calculation method, excitation equipment, and detection instrument, etc., so as to improve the R & D efficiency and at the same time realize the evaluation and test of the research results.

[0058] Further, as shown in Figure 1 the above magnetic field excitation system 11 specifically includes: a frequency converter 5 and a rheostat 6 connected in series; where:

[0059] The frequency converter 5 is used to provide the voltage, current, and frequency required for magnetic field excitation.

[0060] The rheostat 6 is used to adjust the current of magnetic field excitation.

[0061] The above rheostat 6 can specifically adopt, for example, a high-power slide wire rheostat 6.

[0062] Further, referring to Figure 1 shown in the figure, the formation lithology simulation system 2 includes: a formation lithology simulation box 9 for accommodating formation rock samples 10 required for simulation tests;

[0063] In order to better simulate the real environment of the drill string in old wells, one end of the formation lithology simulation box 9 is electrically connected to the magnetic field excitation system 11, and the other end is electrically connected to the simulated old well drill string 13 in the old well simulation system 3; after the formation rock sample 10 is placed in the formation lithology simulation box 9, the formation rock sample 10 is electrically connected to the magnetic field excitation system 11 and the simulated old well drill string 13 respectively.

[0064] The formation rock sample 10 can be selected according to the actual geological conditions to be simulated.

[0065] Further, referring to Figure 1 shown in the figure, the above-mentioned formation lithology simulation system 2 further includes: an incoming ammeter 8 and an outgoing ammeter 11; the incoming ammeter 8 is connected to one end where the electrical signal enters the formation lithology simulation box 9, and the outgoing ammeter 11 is connected to one end of the electrical signal outlet of the formation lithology simulation box 9.

[0066] The incoming ammeter 8 and the outgoing ammeter 11 are respectively used to display the excitation current in the incoming and outgoing directions.

[0067] Further, in order to realize the on-demand adjustment of the inclination angle of the simulated old well drill string 13, the above-mentioned old well simulation system 3 further includes: an adjustable angle simulation test stand 12;

[0068] The simulated old well drill string 13 is installed on the adjustable angle simulation test stand 12; the adjustable angle simulation test stand 12 is used to adjust the inclination angle of the simulated old well drill string 13 on the adjustable angle simulation test stand 12 and drive the simulated old well drill string 13 to move to adjust the distance between the simulated old well drill string 13 and the measurement probe 26.

[0069] Similarly, in order to realize the on-demand adjustment of the inclination angle of the simulated old well drill string 13, the new well detection simulation system 4 further includes: an adjustable angle simulation test stand 12;

[0070] The measurement probe 26 is installed on the adjustable angle simulation test stand 12; the adjustable angle simulation test stand 12 is used to adjust the inclination angle of the measurement probe 26 on the adjustable angle simulation test stand 12 and drive the measurement probe 26 to move to adjust the distance between the simulated old well drill string 13 and the measurement probe 26.

[0071] The adjustable angle simulation test stand 12 in the old well simulation system 3 and the adjustable angle simulation test stand 12 in the new well detection simulation system 4 may have the same structure.

[0072] Specifically, referring to Figure 1 and Figure 2 as shown, the adjustable angle simulation test stand 12 may specifically include: an upper plate 19, a column 17, an inclination adjustment plate 14, a positioning plate 15, a locking bolt 16, a hemispherical support seat 23, a bottom plate 24, a pulley 25, and a ball head 22; where:

[0073] The pulley 25 is connected to the lower end of the bottom plate 24 to facilitate the movement of the adjustable angle simulation test stand 12 on the ground or the test plane;

[0074] The hemispherical support seat 23 is arranged on the bottom plate 24, and the ball head 22 is rotatably connected to the hemispherical support seat 23;

[0075] The ball head 22 is connected to the lower end of the simulated old well drill tool 13 (or the measurement probe 26), so that when the ball head 22 rotates, it can drive the simulated old well drill tool 13 (or the measurement probe 26) to tilt at a preset angle;

[0076] The upper plate 19 is connected to the bottom plate 24 through the column 17;

[0077] The inclination adjustment plate 14 and the positioning plate 15 are located above the upper plate 19; the simulated old well drill tool 13 (or the measurement probe 26) passes through the upper plate 19 and is sleeved into the inclination adjustment plate 14, and is positioned by the positioning plate 15 and fixed to the upper plate 19 by the locking bolt 16.

[0078] Referring to Figure 1 and Figure 2 as shown, the upper plate 19 and the column 17 can be connected and fixed through a compression nut 18 and a support nut 20, and the upper plate 19 can move up and down along the column 17 in the vertical direction to a suitable position and be fixed.

[0079] The compression nut 18 is located above the upper plate 19, and the support nut 20 is located below the upper plate 19 and is connected to the column 17 (threads are provided on the column 17) through threads. By adjusting the supporting nut 20 and the compression nut 18 supporting it, the height of the upper plate 19 can be adjusted to meet the evaluation and test requirements of simulated old well drill tools 13 (or measurement probes 26) of different lengths.

[0080] Further, referring to Figure 3 as shown, the inclination adjustment plate 14 is U-shaped, and the simulated old well drill tool 13 or the measurement probe 26 is sleeved into the U-shaped inner circle of the inclination adjustment plate 14 and abuts against the U-shaped inner circle;

[0081] The end of the inclination adjustment plate 14 is connected to the positioning plate 15 through the locking bolt 16;

[0082] An inclination guiding groove 29 is provided on the upper plate 19, so that the lower end of the locking bolt 16 can move in the inclination guiding groove 29 to adjust the position of the positioning plate 15 in the horizontal direction.

[0083] The U-shaped inner ring of the slope adjustment plate 14 forms an adjustment space for simulating the inclination angle of the old well drilling tool 13 or the measurement probe 26. After adjusting its angle, the old well drilling tool 13 or the measurement probe 26 is sleeved into the U-shaped inner ring of the slope adjustment plate 14 and abuts against the U-shaped inner ring, and also abuts against the positioning plate 15, so that the old well drilling tool 13 or the measurement probe 26 can be relatively fixed in structure with the slope adjustment plate 14, the positioning plate 15 and the upper plate 19 in an inclined state and will not shake, so as to change its inclination angle.

[0084] In one embodiment, referring to Figure 1 As shown, the new well detection simulation system 4 further includes: a data processing system 28; wherein:

[0085] The data processing system 28 is electrically connected to the measurement probe 26 and is used for processing and displaying the magnetic induction signals detected by the measurement probe 26.

[0086] Referring to Figure 1 As shown, the above-mentioned frequency converter 5, rheostat 6, formation lithology simulation box 9, incoming ammeter 8, outgoing ammeter 9, old well drilling tool 13, etc. are sequentially connected by a power line 7 to form an excitation signal and a target source part, while the measurement probe 26 and the data processing system 28 are connected by a signal line 27 to form a detection part, and the old well drilling tool 13 and the measurement probe 26 are respectively installed on two adjustable angle simulation test stands 12. The adjustable angle simulation test stands 12 are designed with adjusting devices (hemispherical support seats, hemispheres, slope adjustment plates, positioning plates, etc.) that can respectively adjust the inclination angles of the old well drilling tool 13 and the measurement probe 26, and pulleys 25 are installed at the bottom of the simulation test stand 12, and the distance between the measurement probe 26 and the old well drilling tool 13 can be adjusted at any time.

[0087] In one embodiment, the old well drilling tool 13 can be, for example, a steel pipe.

[0088] Based on the same inventive concept, the embodiment of the present invention also provides a method for conducting test simulation using the simulation device of the above-mentioned passive active magnetic detection and guidance drilling instrument. The implementation principle of this method can refer to the implementation of the simulation device of the passive active magnetic detection and guidance drilling instrument described above, and the repeated parts will not be elaborated.

[0089] The method for conducting test simulation using the simulation device of the passive active magnetic detection and guidance drilling instrument as described above provided by the embodiment of the present invention includes the following steps:

[0090] 1. Electrically connect the magnetic field excitation system 1, the formation lithology simulation system and the old well simulation system, and adjust the inclination angle of the old well drilling tool in the old well simulation system and the inclination angle of the measurement probe of the new well detection simulation system;

[0091] II. Adjust the distance between the simulated old well drill string and the measurement probe by means of the old well simulation system and / or the new well detection simulation system;

[0092] III. Apply power to the magnetic field excitation system 1 so that it provides an excitation electrical signal according to the preset voltage, current and frequency;

[0093] IV. Analyze and calculate the distance and azimuth between the simulated old well drill string and the measurement probe by processing the magnetic induction signals detected by the measurement probe;

[0094] V. Conduct simulation test analysis based on the calculated distance between the simulated old well drill string and the measurement probe, as well as the actual distance and actual azimuth of the simulated old well drill string and the measurement probe.

[0095] A specific example is used to elaborate in detail on the specific implementation process of the above method:

[0096] 1. Assemble the simulation test stand 12 as shown in Figure 1 、 Figure 2 and Figure 3 . Place the formation lithology simulation box 9 into the formation rock samples 10 required for the simulation test.

[0097] 2. Connect several sections of the old well drill string 13, then connect the ball head 22 at the lower end and the power line 7 at the upper end. Finally, install them together in the old well drill string simulation test stand 12, place the ball head 22 into the hemispherical seat 23, and fit the middle and upper parts into the central holes of the upper plate 19 and the slope adjustment plate 14, and fix them at the predetermined inclination angle through the positioning plate 15 and the locking bolt 16.

[0098] 3. Connect the power line 7 in sequence to the multi-functional frequency converter 5, the high-power slide rheostat 6, the incoming ammeter 8, the formation lithology simulation box 9, the outgoing ammeter 11, and the simulated old well drill string 13 respectively to form the magnetic field excitation system 1, the formation lithology simulation system 2, and the old well simulation system 3.

[0099] 4. Connect the measurement probe 26, the ball head 22 and the signal line 27, and then install them together in the new well simulation test stand 12, place the ball head 22 into the hemispherical seat 23, and fit the middle and upper parts into the central holes of the upper plate 19 and the slope adjustment plate 14, and fix them at the predetermined inclination angle through the positioning plate 15 and the locking bolt 16. The other end of the signal line 27 is connected to the data processing system 28, which can realize data acquisition, processing and display.

[0100] 5. After all the connections are completed, apply a 220V or 380V power supply to the magnetic field excitation system 1 to prepare for the test.

[0101] 6. Adjust the multi-functional frequency converter 5 and the high-power rheostat 6 according to the test requirements so that they provide excitation in accordance with the designed voltage, current, and frequency.

[0102] 7. Adjust the distance and azimuth between the new well simulation test system 4 and the old well simulation test system 3 according to the test requirements. At the same time, adjust the respective inclination angles of the measurement sonde 26 and the simulated old well drill string 13.

[0103] 8. After the excitation is adjusted, the measurement sonde 26 on the new well simulation test system 4 measures the induced magnetic field intensity generated by the simulated old well drill string 13 on the old well simulation test system 3 and transmits it to the data processing system 28. The distance and azimuth between the measurement sonde 26 on the new well simulation test system 4 and the simulated old well drill string 13 on the old well simulation test system 3 are given through analysis and calculation.

[0104] 9. Repeatedly operate and adjust in sequence, change the distance and azimuth between the simulated old well drill string 13 and the measurement sonde 26, and verify the reliability of the two-well magnetic field model, calculation method, excitation equipment, and detection instrument formed by the research by comparing with the known distance and azimuth between the two. Realize the evaluation and test of the research results.

[0105] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. An analog device for a passive active magnetic detection guided drilling instrument, characterized in that, Including: A magnetic field excitation system, a formation lithology simulation system, an old well simulation system, and a new well detection simulation system; The magnetic field excitation system, the formation lithology simulation system, and the old well simulation system are electrically connected in sequence; The old well simulation system is movable and includes a simulated old well drill string, and the inclination angle of the simulated old well drill string is adjustable; The magnetic field excitation system is configured to output a magnetic excitation signal to the simulated old well drill string in the old well simulation system through the formation lithology simulation system, so that the simulated old well drill string generates a magnetic induction signal; The new well detection simulation system is movably arranged around the old well simulation system and includes a measurement probe for detecting the magnetic induction signal generated by the simulated old well drill string in the old well detection simulation system, and the inclination angle of the measurement probe is adjustable.

2. The device according to claim 1, characterized in that, The magnetic field excitation system includes: a frequency converter and a rheostat connected in series; The frequency converter is configured to provide the voltage, current, and frequency required for magnetic field excitation; The rheostat is configured to adjust the current of magnetic field excitation.

3. The device according to claim 1, characterized in that, The formation lithology simulation system includes: a formation lithology simulation box for accommodating formation rock samples required for simulation tests; One end of the lithology simulation box is electrically connected to the magnetic field excitation system, and the other end is electrically connected to the simulated old well drill string in the old well simulation system; and after the formation rock samples are placed, the formation rock samples are respectively electrically connected to the magnetic field excitation system and the simulated old well drill string.

4. The device according to claim 3, characterized in that, The formation lithology simulation system further includes: an incoming ammeter and an outgoing ammeter; The incoming ammeter and the outgoing ammeter are respectively configured to display the excitation current in the incoming direction and the outgoing direction.

5. The device according to claim 1, characterized in that, The old well simulation system further includes: an adjustable angle simulation test stand; The simulated old well drill string is installed on the adjustable angle simulation test stand; the adjustable angle simulation test stand is configured to adjust the inclination angle of the simulated old well drill string on the adjustable angle simulation test stand and drive the simulated old well drill string to move to adjust the distance between the simulated old well drill string and the measurement probe.

6. The device according to claim 1, characterized in that, The new well detection simulation system further includes: an adjustable angle simulation test stand; The measurement probe is installed on the adjustable angle simulation test stand; the adjustable angle simulation test stand is configured to adjust the inclination angle of the measurement probe on the adjustable angle simulation test stand and drive the measurement probe to move to adjust the distance between the simulated old well drill string and the measurement probe.

7. The device according to claim 5 or 6, characterized in that, The adjustable angle simulation test stand includes: An upper plate, a column, an inclination adjustment plate, a positioning plate, a locking bolt, a hemispherical support seat, a bottom plate, a pulley, and a ball head; The pulley is connected to the lower end of the bottom plate; The hemispherical support seat is arranged on the bottom plate, and the ball head is rotatably connected to the hemispherical support seat; The ball head is connected to the lower end of the simulated old well drill string or the measurement probe, so that the rotation of the ball head drives the simulated old well drill string or the measurement probe to incline at a preset angle; The upper plate is connected to the bottom plate through the column; The inclination adjustment plate and the positioning plate are located above the upper plate; the simulated old well drill string or the measurement probe passes through the upper plate and is sleeved into the inclination adjustment plate, and is positioned and fixed to the upper plate through the positioning plate and the locking bolt.

8. The device according to claim 7, characterized in that, The slope adjustment plate is U-shaped, and the simulated old well drill tool or measurement probe is sleeved into the U-shaped inner circle of the slope adjustment plate and abuts against the U-shaped inner circle; The end of the slope adjustment plate is connected to the positioning plate through the locking bolt; The upper plate is provided with a slope guiding groove so that the lower end of the locking bolt moves in the slope guiding groove to adjust the position of the positioning plate in the horizontal direction.

9. The device according to claim 1 or 6, characterized in that, The new well detection simulation system further includes: a data processing system; The data processing system is electrically connected to the measurement probe and is used for processing and displaying the magnetic induction signals detected by the measurement probe.

10. The device according to any one of claims 1 - 6, characterized in that, The simulated old well drill tool is a steel pipe.

11. A method for conducting test simulations using a simulation device of a passive active magnetic detection and guidance drilling instrument as described in any one of claims 1 - 10, comprising: Electrically connect the magnetic field excitation system, the formation lithology simulation system and the old well simulation system, and adjust the inclination angle of the simulated old well drill tool in the old well simulation system and the inclination angle of the measurement probe in the new well detection simulation system; Adjust the distance between the simulated old well drill tool and the measurement probe by moving the old well simulation system and / or the new well detection simulation system; Apply power to the magnetic field excitation system to make it provide excitation electrical signals according to the preset voltage, current and frequency; Analyze and calculate the distance and azimuth between the simulated old well drill tool and the measurement probe by processing the magnetic induction signals detected by the measurement probe; Conduct simulation test analysis based on the calculated distance between the simulated old well drill tool and the measurement probe, as well as the actual distance and actual azimuth of the simulated old well drill tool and the measurement probe.

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