CN107701170B - Near-bit imaging measurement device and method - Google Patents
Near-bit imaging measurement device and method Download PDFInfo
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- CN107701170B CN107701170B CN201610626853.5A CN201610626853A CN107701170B CN 107701170 B CN107701170 B CN 107701170B CN 201610626853 A CN201610626853 A CN 201610626853A CN 107701170 B CN107701170 B CN 107701170B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 84
- 238000005259 measurement Methods 0.000 title claims abstract description 43
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- 238000005553 drilling Methods 0.000 claims abstract description 9
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- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention provides a near-bit imaging measurement device and a near-bit imaging measurement method, and belongs to the field of measurement while drilling of a drilling engineering technology for petroleum exploration and development. The near-bit imaging measuring device comprises an integrated tool face detection sensor, a gamma sensor, a resistivity transmitting magnetic ring, a receiving button electrode and a circuit board, wherein the integrated tool face detection sensor, the gamma sensor, the resistivity transmitting magnetic ring and the receiving button electrode are arranged on a near-bit imaging measuring short section and are respectively connected with the circuit board; the integrated tool surface detection sensor and the gamma sensor are both arranged on a circuit framework in the drill collar; the integrated tool face detection sensor is used for detecting the angle of the tool face; the resistivity transmitting magnetic ring is sleeved in the groove of the drill collar and used for transmitting a 1-10KHz alternating current signal and a frequency shift keying signal; the receiving button electrode is arranged in a groove on the surface of the drill collar; the circuit board is arranged in the groove of the circuit framework.
Description
Technical Field
The invention belongs to the field of measurement while drilling of a drilling engineering technology of petroleum exploration and development, and particularly relates to a near-bit imaging measurement device and method, which are used for measurement while drilling, particularly for near-bit gamma and resistivity imaging measurement.
Background
With the continuous development of petroleum and natural gas, the conventional oil and gas reservoirs in the early period are developed to be close to the end sound, and the development of unconventional oil and gas reservoirs and complex oil and gas reservoirs is carried out from shallow layers to deep layers at present. The use of directional well construction in these unconventional and complex reservoirs is becoming increasingly common. With the continuous development of modern electronic measurement technology, near-bit instruments can measure engineering parameters such as well deviation and azimuth at a bit, and geological parameters such as resistivity and gamma in real time in the drilling process. Due to the special structure of the near-bit instrument, a near-bit measuring circuit, a sensor and the like are all installed in a short section of the near-bit, wherein the short section is about 1 meter in height.
The prior art is single gamma imaging or resistivity imaging, and most of the technologies are aimed at non-near-bit, and the design is very complicated, so that the technologies are not suitable for near-bit use. For example: CN 200510043236.4-well deviation and orientation gamma measurement while drilling instrument, CN 201210167670.3-an orientation gamma measurement method and equipment, and CN 201110152751.1-orientation gamma logging device. Prior art cn200810114633. x-a near-bit geosteering detection system, although a near-bit measurement method is described, the technique has no imaging function. Therefore, in order to overcome the defects in the prior art and meet the continuous requirement of geosteering for near-bit imaging measurement, a near-bit imaging measurement method and a near-bit imaging measurement device are needed.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a near-bit imaging measurement device and a near-bit imaging measurement method, which can synchronously realize the imaging measurement of gamma and resistivity of a near-bit, transmit the measured imaging data to MWD through a transmitting magnetic ring of the resistivity, and transmit the measured imaging data to the ground through the MWD. Near-bit imaging data transmitted to the surface will provide the field engineer with the most effective geosteering reference data.
The invention is realized by the following technical scheme:
a near-bit imaging measuring device comprises an integrated tool face detection sensor, a gamma sensor, a resistivity emission magnetic ring, a receiving button electrode and a circuit board, wherein the integrated tool face detection sensor, the gamma sensor, the resistivity emission magnetic ring and the receiving button electrode are arranged on a near-bit imaging measuring nipple and are respectively connected with the circuit board;
the integrated tool surface detection sensor and the gamma sensor are both arranged on a circuit framework in the drill collar;
the integrated tool face detection sensor is used for detecting the angle of the tool face;
the resistivity transmitting magnetic ring is sleeved in the groove of the drill collar and used for transmitting a 1-10KHz alternating current signal and a frequency shift keying signal;
the receiving button electrode is arranged in a groove on the surface of the drill collar;
the circuit board is arranged in the groove of the circuit framework.
The circuit board comprises a microprocessor module, a gamma processing circuit module, a resistivity transmitting circuit module, a resistivity receiving circuit module, a tool surface processing circuit module, a power supply module and a serial port transmission module;
the serial port transmission module, the gamma processing circuit module, the resistivity transmitting circuit module, the resistivity receiving circuit module and the tool surface processing circuit module are respectively connected with the microprocessor module;
the gamma sensor is connected with the gamma processing circuit module through a high-voltage contact pin, the integrated tool surface detection sensor is connected with the tool surface processing circuit module through the high-voltage contact pin, the receiving button electrode is connected with the resistivity receiving circuit module through the high-voltage contact pin, and the resistivity transmitting magnetic ring is connected with the resistivity transmitting circuit module through the high-voltage contact pin.
The integrated tool surface detection sensor integrates two fluxgate sensors, the included angle of the two fluxgate sensors is 90 degrees, one fluxgate sensor is an X axis, and the other fluxgate sensor is a Y axis;
the fluxgate sensor adopts an HMC1022 fluxgate sensor.
The gamma sensor consists of a sodium iodide material and a photomultiplier, three surfaces of the gamma sensor are surrounded by a gamma shielding structure, and only one surface facing the outer side is not provided with a shielding material;
the shielding structure is square, and the adopted shielding material is tungsten-nickel alloy.
The resistivity emission magnetic ring is arranged in an annular groove formed in the surface of the drill collar, and the annular groove is insulated and protected with the drill collar by adopting an insulating material;
the resistivity emission magnetic ring is formed by winding 100 turns of enameled wires on an annular magnetic core, and two ends of the enameled wires are connected to a circuit board on the circuit framework through high-voltage contact pins.
The receiving button electrode is arranged in a circular groove on the surface of the drill collar, and the periphery of the receiving button electrode is insulated from the drill collar by adopting an insulating material;
the receiving button electrode is composed of a metal cylinder with the thickness of 1cm-3cm and is connected to the circuit board through a high-voltage contact pin.
A near bit imaging measurement method realized by the near bit imaging measurement device is characterized in that the center point of the receiving button electrode, the center point of the gamma sensor and the integrated tool surface detection sensor are designed to be positioned on the same straight line, and the straight line is parallel to the central axis of the near bit imaging measurement device;
setting the central point of the gamma sensor to be at 0 degree position when being positioned right above, and rotating for 360 degrees for a circle; the near-bit imaging measuring device is connected above the bit and continuously rotates along with the bit;
the method comprises the following steps:
(1) a microcontroller module in the near-bit imaging measuring device detects a tool face detection sensor to obtain the angle of a tool face on the circumference by taking 0.1-1 millisecond as a period;
(2) when the microcontroller module detects that the tool face reaches 0 degree, the microcontroller module immediately starts to count the output of the gamma sensor;
(3) when the microcontroller module detects that the tool face reaches 11.25 degrees, the microcontroller module synchronously transmits 1-10KHz alternating current signals to the resistivity transmitting magnetic ring, collects the current of the receiving button electrode, and calculates and converts the current into the resistivity of the stratum corresponding to the receiving button electrode, namely the resistivity of the sector of 0-22.5 degrees;
(4) when the microcontroller module detects that the tool face reaches 22.5 degrees, the count value output by the microcontroller module to the gamma sensor is stored for one time, and the count value is the gamma value of the sector of 0-22.5 degrees;
(5) when the microcontroller module detects that the tool face reaches 33.75 degrees, repeating the step (3), and collecting the resistivity, namely the resistivity of a sector with the temperature of 22.5-45 degrees;
(6) when the microcontroller module detects that the tool face rotates from 45 degrees to 45 degrees or more, the count value output by the microcontroller module to the gamma sensor is stored once, and the count value in the step (4) is subtracted from the count value to obtain the gamma value of the sector of 22.5-45 degrees;
(7) when the microcontroller module detects that the tool faces are respectively 56.25 degrees, 78.75 degrees, 101.25 degrees, 123.75 degrees, 146.25 degrees, 168.75 degrees, 191.25 degrees, 213.75 degrees, 236.25 degrees, 258.75 degrees, 281.25 degrees, 303.75 degrees, 326.25 degrees and 348.75 degrees, respectively repeating the resistivity obtained in the step (3), namely the resistivity of the corresponding sector;
(8) when the microcontroller module detects that the tool face is 67.5 degrees, 90 degrees, 112.5 degrees, 135 degrees, 157.5 degrees, 180 degrees, 202.5 degrees, 225 degrees, 247.5 degrees, 270 degrees, 292.5 degrees, 315 degrees and 337.5 degrees respectively, recording a count value output by the gamma sensor, and subtracting the count value of the last time from the count value to obtain a gamma value of the corresponding sector;
(9) filling the different shades of the gamma values and the measured data of the resistivity of the 16 sectors obtained above into the 16 sectors by taking the gamma values and the measured data of the resistivity of the 16 sectors as the numerical values of the shades of the color, and completing the imaging of the 16 sectors around one well;
(10) the micro-controller module carries out FSK coding modulation on the acquired imaging data, namely the gamma value and the resistivity of 16 sectors, the signals which are coded and modulated are transmitted to the MWD above the power drill through the resistivity transmitting circuit module and the resistivity transmitting magnetic ring, the MWD receives the signals and demodulates the signals to obtain the imaging data, and the MWD transmits the data to the ground.
The calculation in the step (3) is converted into the resistivity of the stratum corresponding to the button electrode, and the method is realized by the following steps:
calibrating by using the near-bit imaging measuring device: monitoring and receiving the current of the button electrode under the known environments with different formation resistivities to generate a calibration result, wherein the calibration result is a conversion table or a formula of the relationship between the current and the formation resistivity;
monitoring with the near-bit imaging measurement device: firstly, collecting and receiving the current of the button electrode, and then carrying out conversion calculation according to the calibration result to obtain the resistivity of the stratum.
For the imaging detection of 4 sectors, 8 sectors, 32 sectors, 64 sectors, 128 sectors or other sectors, the imaging detection can be realized only by changing the angles from the step (3) to the step (8);
for the condition that the central point of the button electrode, the central point of the gamma sensor and the integrated tool surface detection sensor are positioned on the same straight line, but the straight line is not parallel to the central axis of the near-bit imaging measurement device, angle compensation is carried out on the measurement data of the resistivity;
and correcting the deviation when the imaging data is processed under the condition that the central point of the receiving button electrode, the central point of the gamma sensor and the integrated tool surface detection sensor are not positioned on the same straight line.
Compared with the prior art, the invention has the beneficial effects that: the invention can fully optimize the instrument structure of the near-bit and realize the imaging measurement of the near-bit. The invention realizes the imaging measurement of gamma and resistivity at the same time, and also realizes the wireless short transmission of the near-bit imaging data by utilizing the transmitting magnetic ring of the resistivity. .
Drawings
Fig. 1 shows a schematic structural diagram of a near-bit imaging measurement device.
FIG. 2 shows a schematic circuit diagram of a near-bit imaging measurement device.
FIG. 3 shows a schematic view of an imaging sector for near bit imaging measurements.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the near-bit imaging measuring device adopts a scanning imaging mode and comprises an integrated tool surface detection sensor, a gamma measuring sensor, a resistivity transmitting magnetic ring and a receiving button electrode, wherein the sensors are arranged on a near-bit imaging measuring short section, as shown in figure 1. Wherein two fluxgate sensors are integrated in the integrated tool face detection sensor, the included angle between the two fluxgate sensors is 90 degrees, one fluxgate sensor is an X axis, and the other fluxgate sensor is a Y axis. The angle of the tool face of the whole instrument can be detected, and the sector can be further calculated. When the device is used, the device is connected between a drill bit and a drill collar and then is lowered to the bottom of a well, specifically, the device is connected with the drill collar through an upper connecting buckle 70 and is connected with the drill bit through a lower connecting buckle 80.
Because the length of the short section of the near-bit measuring instrument is limited, the whole imaging measuring device is controlled within 1 meter. The strength requirement of a short joint of a near-bit measuring instrument is extremely high, too many mounting grooves are not allowed to be formed, and the space is very limited, so that all measuring sensors comprise: the gamma sensor 30, the receiving button electrode 40, the resistivity emitting magnet ring 50, and the integrated tool face detection sensor 60 are all very compact, with only one of these sensors on the entire assembly.
The receiving button electrode 40 is installed in a circular groove on the surface of the drill collar, and the periphery of the receiving button electrode is insulated from the drill collar 20 by adopting an insulating material. The receiving button electrode 40 is formed of a metal cylinder having a thickness of 1cm to 3 cm. The receiving button electrode 40 is connected to the circuit board on the circuit skeleton through a high voltage pin.
The transmitting magnetic ring with the resistivity is sleeved in the groove of the drill collar and is connected to the circuit board through the high-voltage contact pin. The circuit board is arranged in the groove of the circuit framework. In specific implementation, the resistivity emission magnetic ring 50 is installed in an annular groove formed in the surface of the drill collar 20, and the annular groove is insulated and protected from the drill collar 20 by adopting an insulating material. The resistivity emission magnetic ring 50 is formed by winding 100 turns of enameled wires on an annular magnetic core, and two ends of the enameled wires are connected to a circuit board on the circuit framework through high-voltage contact pins.
Wherein the gamma sensor 30 and the integrated tool face detection sensor 60 are mounted on a circuit frame within the drill collar, not shown in fig. 1, inside the drill collar. The gamma sensor 30 is composed of a sodium iodide material and a photomultiplier tube. The gamma sensor 30 is surrounded on 3 sides by gamma shielding material, and only the outer side of the device is not provided with shielding material, the shielding structure is square, and the shielding material is tungsten-nickel alloy.
The integrated tool face detection sensor 60 employs an HMC1022 fluxgate sensor, which integrates two fluxgate sensors having an included angle of 90 degrees, one being an X axis and the other being a Y axis. The angle of the tool face of the whole instrument can be detected, and the sector can be further calculated.
As shown in fig. 2, the circuit board includes a microprocessor module 100, a gamma processing circuit module 110, a resistivity transmitting circuit module 120, a resistivity receiving circuit module 130, a tool face processing circuit module 140, a power supply module 160, and a serial port transmission module 150. The microprocessor module 100 is connected with the serial port transmission module 150, and the gamma processing circuit module 110, the resistivity transmitting circuit module 120, the resistivity receiving circuit module 130 and the tool surface processing circuit module 140 are respectively connected with the processor module 100; the gamma sensor 30 is connected to the gamma processing circuit module 110, the integrated tool face detection sensor 60 is connected to the tool face processing circuit module 140, the receiving button electrode 40 is connected to the resistivity receiving circuit module 130, and the resistivity transmitting magnetic ring 50 is connected to the resistivity transmitting circuit module 120.
One function of the resistivity transmitting circuit module and the resistivity transmitting magnetic ring is to transmit 1-10KHz alternating current signals. In this embodiment, one function of the resistivity transmitting circuit module 120 and the resistivity transmitting magnetic ring 50 is to transmit 2KHz alternating current signals, and receive the signals by using the receiving button electrode 40 and the resistivity receiving circuit module 130, so as to measure the resistivity. Another function is to transmit Frequency Shift Keyed (FSK) signals, i.e., to communicate digital information using frequency variations of a carrier wave. This signal is received by the MWD above the power drill, which is also equipped with similar magnetic rings and processing modules. The near-bit imaging measurement data is wirelessly and short-transmitted to the MWD and then transmitted to the ground through the MWD for geological guiding.
For convenience of calculation, the center point of the resistivity receiving button electrode 40, the center point of the gamma sensor 30 and the integrated tool face detection sensor 60 are designed to be on a straight line, the straight line is parallel to the central axis of the near-bit imaging measurement device, if the two lines are not parallel, only one angle compensation needs to be carried out on the measurement data of the resistivity, the position is set to be 0 degree when the center point of the gamma sensor is arranged right above, and the rotation is 360 degrees in one circle. The near-bit imaging measuring device is connected above the bit and continuously rotates along with the bit, and the rotating speed of the bit is generally 1-5 revolutions per second. The center point of the receiving button electrode 40, the center point of the gamma sensor 30 and the integrated tool surface detection sensor 60 are designed to be in a straight line for the convenience of processing the imaging data, so that the correction of the angular deviation of the imaging is not required. Since the three monitored sector positions are identical when in a straight line. The three may not be in a straight line, for example, may be oblique lines, or may be in different angles, that is, the three are different in different angles or initial sectors, and the deviation may be corrected during the subsequent imaging data processing.
The imaging measurement method of the near-bit imaging measurement device comprises the following steps:
1. the microcontroller module 100 inside the near bit imaging measurement device detects the tool face detection sensor 60 at a 0.1 millisecond period with the microcontroller module 100.
2. When the microcontroller module 100 detects that the tool face is at 0 degrees, the microcontroller module 100 immediately starts counting the output of the gamma sensor.
3. When the microcontroller module 100 detects that the tool face reaches 11.25 degrees, the microcontroller module 100 synchronously transmits 2KHz alternating current signals to the resistivity transmitting magnetic ring 50, collects and receives the current of the button electrode 40, and calculates and converts the current into the resistivity of the stratum corresponding to the button electrode 40, namely the resistivity of the sector of 0-22.5 degrees. The calculation and conversion into the resistivity of the corresponding stratum of the button electrode 40 are realized by the following steps: after the structure and circuit design of the device are completed, calibration is performed. The calibration process is to monitor the current of the electrode 40 under the known environment with different formation resistivities. And then generating a conversion table or formula of the relationship between the current and the formation resistivity, namely a calibration result. The process of formation resistivity calculation when used is as follows: firstly, the current of the button electrode 40 is collected and received, and then conversion calculation is carried out according to a calibration result to obtain the resistivity of the stratum.
4. When the microcontroller module 100 detects that the tool face is at 22.5 degrees, the count value output by the microcontroller module 100 to the gamma sensor 30 is stored once, which is the gamma size of the sector 0-22.5 degrees. Thus, the detection of gamma and resistivity of the sector of 0-22.5 degrees is completed.
5. When the microcontroller module 100 detects that the tool face reaches 33.75 degrees, the step 3 is repeated, and the resistivity is acquired, namely the resistivity value of the sector of 22.5-45 degrees.
6. When the microcontroller module 100 detects that the tool face rotates from approximately 45 degrees to 45 degrees or more, the count value output by the microcontroller module 100 to the gamma sensor is stored once, and the gamma value of the sector of 22.5 degrees to 45 degrees is obtained by subtracting the count value in the step 4 from the count value.
7. And when the microcontroller module 100 detects that the tool faces are respectively 56.25 degrees, 78.75 degrees, 101.25 degrees, 123.75 degrees, 146.25 degrees, 168.75 degrees, 191.25 degrees, 213.75 degrees, 236.25 degrees, 258.75 degrees, 281.25 degrees, 303.75 degrees, 326.25 degrees and 348.75 degrees, respectively repeating the resistivity acquired in the step 3 to obtain the resistivity of the corresponding sector.
8. When the microcontroller module 100 detects that the tool face is 67.5 degrees, 90 degrees, 112.5 degrees, 135 degrees, 157.5 degrees, 180 degrees, 202.5 degrees, 225 degrees, 247.5 degrees, 270 degrees, 292.5 degrees, 315 degrees and 337.5 degrees, respectively, the count value output by the gamma sensor is recorded, and the gamma of the corresponding sector is obtained by subtracting the last value from the count value.
9. Thus, gamma and resistivity measurements of 16 sectors are obtained, the data size of the gamma and resistivity measurements is taken as the value of the shade, and the 16 sectors are filled with different shades, so that 16 sectors of one well circumference are imaged. The sectors are shown in figure 3.
10. The microcontroller module 100 performs FSK code modulation on the acquired imaging data (i.e. gamma and resistivity of 16 sectors), transmits the code modulated signals to the MWD above the power drill through the resistivity transmitting circuit module and the resistivity transmitting magnetic ring, the MWD receives and demodulates the signals to obtain the imaging data, and the MWD transmits the data to the surface.
According to the method, 4-sector, 8-sector, 32-sector, 64-sector, 128-sector and the like imaging detection can be realized by persons in the field without creative labor.
The above-described embodiment is only one embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be easily made based on the application and principle of the present invention disclosed in the present application, and the present invention is not limited to the method described in the above-described embodiment of the present invention, so that the above-described embodiment is only preferred, and not restrictive.
Claims (9)
1. A near-bit imaging measurement device is characterized in that: the near-bit imaging measuring device comprises an integrated tool surface detection sensor, a gamma sensor, a resistivity transmitting magnetic ring, a receiving button electrode and a circuit board which are arranged on a near-bit imaging measuring short section, wherein the integrated tool surface detection sensor, the gamma sensor, the resistivity transmitting magnetic ring and the receiving button electrode are respectively connected with the circuit board;
the integrated tool surface detection sensor and the gamma sensor are both arranged on a circuit framework in the drill collar;
the integrated tool face detection sensor is used for detecting the angle of the tool face;
the resistivity emission magnetic ring is formed by winding an enameled wire on an annular magnetic core; the resistivity transmitting magnetic ring is sleeved in the groove of the drill collar and used for transmitting a 1-10KHz alternating current signal and a frequency shift keying signal; the 1-10KHz alternating current signal is received by a receiving button electrode to realize the measurement of resistivity, and the frequency shift keying signal is received by MWD above the power drilling tool to realize the wireless short transmission of near-bit imaging data;
the receiving button electrode is arranged in a groove on the surface of the drill collar;
the circuit board is arranged in the groove of the circuit framework;
the circuit board comprises a microcontroller module, a gamma processing circuit module, a resistivity transmitting circuit module, a resistivity receiving circuit module, a tool surface processing circuit module, a power supply module and a serial port transmission module;
the microcontroller module transmits a 1-10KHz alternating current signal to the resistivity transmitting magnetic ring, collects the current of the receiving button electrode, and calculates and converts the current into the resistivity of the stratum corresponding to the receiving button electrode;
and the microcontroller module performs FSK coding modulation on the acquired gamma value and resistivity, and transmits the coded and modulated signals to the MWD above the power drilling tool through the resistivity transmitting circuit module and the resistivity transmitting magnetic ring.
2. The near-bit imaging measurement device of claim 1, wherein:
the serial port transmission module, the gamma processing circuit module, the resistivity transmitting circuit module, the resistivity receiving circuit module and the tool surface processing circuit module are respectively connected with the microprocessor module;
the gamma sensor is connected with the gamma processing circuit module through a high-voltage contact pin, the integrated tool surface detection sensor is connected with the tool surface processing circuit module through the high-voltage contact pin, the receiving button electrode is connected with the resistivity receiving circuit module through the high-voltage contact pin, and the resistivity transmitting magnetic ring is connected with the resistivity transmitting circuit module through the high-voltage contact pin.
3. The near-bit imaging measurement device of claim 2, wherein: the integrated tool surface detection sensor integrates two fluxgate sensors, the included angle of the two fluxgate sensors is 90 degrees, one fluxgate sensor is an X axis, and the other fluxgate sensor is a Y axis;
the fluxgate sensor adopts an HMC1022 fluxgate sensor.
4. The near-bit imaging measurement device of claim 3, wherein: the gamma sensor consists of a sodium iodide material and a photomultiplier, three surfaces of the gamma sensor are surrounded by a gamma shielding structure, and only one surface facing the outer side is not provided with a shielding material;
the shielding structure is square, and the adopted shielding material is tungsten-nickel alloy.
5. The near-bit imaging measurement device of claim 4, wherein: the resistivity emission magnetic ring is arranged in an annular groove formed in the surface of the drill collar, and the annular groove is insulated and protected with the drill collar by adopting an insulating material;
the resistivity emission magnetic ring is formed by winding 100 turns of enameled wires on an annular magnetic core, and two ends of the enameled wires are connected to a circuit board on the circuit framework through high-voltage contact pins.
6. The near-bit imaging measurement device of claim 5, wherein: the receiving button electrode is arranged in a circular groove on the surface of the drill collar, and the periphery of the receiving button electrode is insulated from the drill collar by adopting an insulating material;
the receiving button electrode is composed of a metal cylinder with the thickness of 1cm-3cm and is connected to the circuit board through a high-voltage contact pin.
7. A near-bit imaging measurement method implemented by using the near-bit imaging measurement device according to any one of claims 1 to 6, characterized in that: designing the central point of the receiving button electrode, the central point of the gamma sensor and the integrated tool surface detection sensor to be positioned on the same straight line, wherein the straight line is parallel to the central axis of the near-bit imaging measurement device;
setting the central point of the gamma sensor to be at 0 degree position when being positioned right above, and rotating for 360 degrees for a circle; the near-bit imaging measuring device is connected above the bit and continuously rotates along with the bit;
the method comprises the following steps:
(1) a microcontroller module in the near-bit imaging measuring device detects a tool face detection sensor to obtain the angle of a tool face on the circumference by taking 0.1-1 millisecond as a period;
(2) when the microcontroller module detects that the tool face reaches 0 degree, the microcontroller module immediately starts to count the output of the gamma sensor;
(3) when the microcontroller module detects that the tool face reaches 11.25 degrees, the microcontroller module synchronously transmits 1-10KHz alternating current signals to the resistivity transmitting magnetic ring, collects the current of the receiving button electrode, and calculates and converts the current into the resistivity of the stratum corresponding to the receiving button electrode, namely the resistivity of the sector of 0-22.5 degrees;
(4) when the microcontroller module detects that the tool face reaches 22.5 degrees, the count value output by the microcontroller module to the gamma sensor is stored for one time, and the count value is the gamma value of the sector of 0-22.5 degrees;
(5) when the microcontroller module detects that the tool face reaches 33.75 degrees, repeating the step (3), and collecting the resistivity, namely the resistivity of a sector with the temperature of 22.5-45 degrees;
(6) when the microcontroller module detects that the tool face rotates from 45 degrees to 45 degrees or more, the count value output by the microcontroller module to the gamma sensor is stored once, and the count value in the step (4) is subtracted from the count value to obtain the gamma value of the sector of 22.5-45 degrees;
(7) when the microcontroller module detects that the tool faces are respectively 56.25 degrees, 78.75 degrees, 101.25 degrees, 123.75 degrees, 146.25 degrees, 168.75 degrees, 191.25 degrees, 213.75 degrees, 236.25 degrees, 258.75 degrees, 281.25 degrees, 303.75 degrees, 326.25 degrees and 348.75 degrees, respectively repeating the resistivity obtained in the step (3), namely the resistivity of the corresponding sector;
(8) when the microcontroller module detects that the tool face is 67.5 degrees, 90 degrees, 112.5 degrees, 135 degrees, 157.5 degrees, 180 degrees, 202.5 degrees, 225 degrees, 247.5 degrees, 270 degrees, 292.5 degrees, 315 degrees and 337.5 degrees respectively, recording a count value output by the gamma sensor, and subtracting the count value of the last time from the count value to obtain a gamma value of the corresponding sector;
(9) filling the different shades of the gamma values and the measured data of the resistivity of the 16 sectors obtained above into the 16 sectors by taking the gamma values and the measured data of the resistivity of the 16 sectors as the numerical values of the shades of the color, and completing the imaging of the 16 sectors around one well;
(10) the micro-controller module carries out FSK coding modulation on the acquired imaging data, namely the gamma value and the resistivity of 16 sectors, the signals which are coded and modulated are transmitted to the MWD above the power drill through the resistivity transmitting circuit module and the resistivity transmitting magnetic ring, the MWD receives the signals and demodulates the signals to obtain the imaging data, and the MWD transmits the data to the ground.
8. The near-bit imaging measurement method of claim 7, wherein: the calculation in the step (3) is converted into the resistivity of the stratum corresponding to the button electrode, and the method is realized by the following steps:
calibrating by using the near-bit imaging measuring device: monitoring and receiving the current of the button electrode under the known environments with different formation resistivities to generate a calibration result, wherein the calibration result is a conversion table or a formula of the relationship between the current and the formation resistivity;
monitoring with the near-bit imaging measurement device: firstly, collecting and receiving the current of the button electrode, and then carrying out conversion calculation according to the calibration result to obtain the resistivity of the stratum.
9. The near-bit imaging measurement method of claim 8, wherein: for the imaging detection of 4 sectors, 8 sectors, 32 sectors, 64 sectors, 128 sectors or other sectors, the imaging detection can be realized only by changing the angles from the step (3) to the step (8);
for the condition that the central point of the button electrode, the central point of the gamma sensor and the integrated tool surface detection sensor are positioned on the same straight line, but the straight line is not parallel to the central axis of the near-bit imaging measurement device, angle compensation is carried out on the measurement data of the resistivity;
and correcting the deviation when the imaging data is processed under the condition that the central point of the receiving button electrode, the central point of the gamma sensor and the integrated tool surface detection sensor are not positioned on the same straight line.
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