CN117662132A - Near-bit logging instrument for coal bed gas drilling and bit posture adjusting method - Google Patents
Near-bit logging instrument for coal bed gas drilling and bit posture adjusting method Download PDFInfo
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- CN117662132A CN117662132A CN202211020417.5A CN202211020417A CN117662132A CN 117662132 A CN117662132 A CN 117662132A CN 202211020417 A CN202211020417 A CN 202211020417A CN 117662132 A CN117662132 A CN 117662132A
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- 238000005553 drilling Methods 0.000 title claims abstract description 66
- 239000003245 coal Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 38
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000005259 measurement Methods 0.000 claims description 32
- 230000008859 change Effects 0.000 claims description 20
- 238000003384 imaging method Methods 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
The invention relates to the technical field of petroleum exploration and drilling and production, in particular to a near-bit logging instrument for coal bed methane drilling and a bit posture adjusting method, wherein the near-bit logging instrument comprises the following components: the drill collar comprises a drill collar and a drill bit, wherein the drill bit is arranged at the lower end of the drill collar, a transmitting coil is embedded around the lower end of the drill collar, which is close to the upper part of the drill bit, an azimuth button electrode and azimuth gamma are arranged on the same horizontal position of the side wall surface of the drill collar above the transmitting coil in an embedded mode, the azimuth button electrode and the azimuth gamma are circumferentially spaced by 180 degrees, a measuring coil is embedded around the inner periphery of the middle drill collar wall of the drill collar, which is immediately above the azimuth button electrode and the azimuth gamma, and the transmitting coil and the measuring coil are spiral coils. The tool increases the measure of azimuthal resistivity and the measure of bit resistivity that indicates changes in reservoir resistivity ahead of the bit. By adopting the method for adjusting the posture of the drill bit of the logging instrument, the track of the well bore can be adjusted in time, and the method has very important significance for solving the problems encountered in the existing coalbed methane drilling and improving the drilling meeting rate of the coalbed methane.
Description
Technical Field
The invention relates to the technical field of petroleum exploration and drilling and production, in particular to a near-bit logging instrument for coal bed methane drilling and a bit posture adjusting method.
Background
The rapid development of measurement and control while drilling technology, the geosteering drilling technology becomes an important means for evaluating the stratum of wells with complex structures such as high-inclination wells, horizontal wells, multi-branch wells and the like, the former geosteering technology mainly refers to electromagnetic wave resistivity while drilling and azimuth gamma measurement data, and in the drilling development of coal bed methane horizontal wells, an electromagnetic wave resistivity while drilling instrument cannot obtain an accurate stratum resistivity value due to range limitation due to the characteristics of high resistivity, low gamma, strong heterogeneity and the like of a reservoir, and the instrument is far away from a drill bit, so that engineers cannot be guided to adjust the posture of the drill bit in time. At present, the geosteering of coal bed gas only can rely on near-bit azimuth gamma logging instrument to adjust the drill bit gesture, but its resolution ratio is low, only reflects reservoir circumference lithology information, can't instruct reservoir electrical property information and the change of the preceding reservoir of drill bit, leads to coal bed gas reservoir to bore and meets rate low, to simple reservoir, can just barely accomplish the task, but to the fault, the reservoir that fluctuates, once the drill bit wears out the reservoir, hardly returns to the reservoir.
The Chinese patent document with the bulletin number of CN212272158U discloses a highly integrated multifunctional five-parameter logging instrument, which comprises a logging instrument shell, wherein one end of the logging instrument shell is provided with a first connector, one end of the logging instrument shell, which is far away from the first connector, is provided with a second connector, one end of the logging instrument shell, which is close to the first connector, is provided with a flow sensor, the side edge of the flow sensor is provided with a pressure sensor, one side, which is close to the pressure sensor, of the middle part of the logging instrument shell is provided with a gamma sensor, one side of the gamma sensor is provided with a well inclination azimuth sensor, one side, which is close to the well inclination azimuth sensor, of the second connector is provided with a temperature sensor, one side, which is close to the temperature sensor, of the gamma sensor is provided with a positioning device, and a plurality of electrically connected circuit devices are arranged in the logging instrument shell; the five-parameter logging instrument is highly integrated, but cannot timely guide engineers to adjust the posture of the drill bit, and cannot indicate the electrical information of the reservoir and the change of the reservoir in front of the drill bit.
Disclosure of Invention
The invention provides a near-bit logging instrument for coal bed gas drilling and a bit posture adjusting method, which overcome the defects of the prior art, and can effectively solve the problem that the conventional geosteering system cannot indicate reservoir electrical information and changes of reservoirs in front of a bit.
One of the technical schemes of the invention is realized by the following measures: a near-bit logging tool for use in the drilling of coal bed gas, comprising: the drill collar comprises a drill collar, a drill bit, a transmitting coil, a measuring coil, an azimuth button electrode, an azimuth gamma sensor and a battery pack, wherein the drill bit is arranged at the lower end of the drill collar, the transmitting coil is embedded in the lower end of the drill collar, which is close to the upper part of the drill bit, the azimuth button electrode and the azimuth gamma sensor are embedded in the same horizontal position of the side wall surface of the drill collar above the transmitting coil, the azimuth button electrode and the azimuth gamma sensor are circumferentially spaced by 180 degrees, the measuring coil capable of receiving the transmitting signal of the transmitting coil is embedded in the middle part of the drill collar above the azimuth button electrode and the azimuth gamma sensor, the transmitting coil and the measuring coil are spiral coils, the battery pack is embedded in the drill collar above the measuring coil, and the battery pack is electrically connected with the transmitting coil and the measuring coil respectively.
The following are further optimizations and/or improvements to one of the above-described inventive solutions:
the outer side of the upper part of the drill collar is provided with a clamp type centralizer.
The upper end face of the drill collar is vertically and fixedly provided with a screw.
The second technical scheme of the invention is realized by the following measures: the method for adjusting the posture of the drill bit for drilling the coal bed gas comprises the following steps:
s1, constructing a geological model before drilling and designing a well track according to adjacent well data and seismic measurement data;
s2, drill bit resistivity, button electricity extremum in different directions and gamma measurement curve data are obtained in real time through a near-bit logging instrument for coal bed methane drilling in the drilling process;
s3, performing real-time forward modeling in the drilling process to obtain simulated bit resistivity, simulated average gamma curve and simulated average resistivity;
s4, acquiring well side construction information and stratum layer arrangement information, wherein the well side construction information comprises cracks, holes, stratum dip angles and azimuth angles;
s5, obtaining an average resistivity and an average gamma curve which change along with the well depth based on button resistivity and gamma measurement curves in different directions;
s5, comprehensively judging the relative position relation between the drill bit and the reservoir by combining the acquired well side structure and stratum layer information, the drill bit resistivity, the average resistivity and the average gamma curve, and guiding the adjustment of the posture of the drill bit.
The following is a further optimization and/or improvement of the second technical scheme of the invention:
the step S4 specifically includes:
s41, acquiring button resistivity and gamma logging curves of different orientations according to well depth change through data calibration and time depth conversion based on button electrical extremum and gamma measurement curve data of different orientations acquired in real time;
s42, obtaining a resistivity imaging map and a gamma imaging map of full borehole coverage through an artifact data processing technology according to button resistivity and gamma measurement curves in different directions;
s43, acquiring the well-side construction information and the stratum layer information through an image data processing technology based on the resistivity imaging diagram and the gamma imaging diagram.
In the step S5, the relative positional relationship between the drill bit and the reservoir is comprehensively determined, and the adjustment of the posture of the drill bit is guided, which specifically includes:
s51, judging whether the drill bit passes through a layer interface according to azimuth gamma and azimuth button resistivity logging information;
s52, when the drill bit passes through the stratum interface, determining the adjustment posture of the drill bit according to the average resistivity and the gamma response change: maintaining bit attitude as average resistivity increases and average gamma decreases; when the average resistivity decreases and the average gamma increases, the bit is adjusted in the opposite direction.
In the step S5, whether the drill bit passes through the layer interface is determined according to the azimuth gamma and azimuth resistivity logging information, and if the logging instrument does not pass through the layer interface, the following steps are performed:
s54, comparing the bit resistivity, the average gamma curve and the average resistivity which are obtained in real time in the drilling process with the simulated bit resistivity, the average gamma curve and the average resistivity which are obtained in the step S3;
s55, updating the forward modeling model in the step S3 according to the comparison result to obtain the layer boundary distance between the drill bit and the reservoir interface;
s56, when the layer boundary distance is smaller than the safe distance, the drill bit is adjusted downwards; when the layer boundary distance is larger than the safety distance and smaller than the detection range, the posture of the drill bit is kept; when the layer boundary distance is larger than the detection range, the drill bit is adjusted upwards.
The bit resistivity in the above step S2 is calculated as follows:
wherein RB is bit resistivity, I is a received signal value of a measuring coil, and K is a scale factor.
The invention provides a near-bit logging instrument for coal bed gas drilling and a bit posture adjusting method, wherein the near-bit logging instrument increases the measurement of azimuth resistivity and the measurement of bit resistivity indicating the change of reservoir resistivity in front of a bit while maintaining the azimuth gamma measurement characteristic of the existing logging instrument, and overcomes the defects that the traditional geosteering system only depends on azimuth gamma guiding and has small measurement range of electromagnetic wave resistivity while drilling. According to the bit attitude adjustment method, a site directional well engineer can acquire the top information and the front information of a reservoir by using the acquired real-time measurement parameters, timely identify the change of a stratum, determine the position of a drilling tool in the coal seam, timely adjust the track of a borehole, drill the track along the spreading direction of the reservoir, and ensure the drilling meeting rate of the reservoir. According to the method for adjusting the bit posture, the relation between the formation attitude and the relative position of the bit is represented by combining a plurality of dimension measurement data such as reservoir electrical information, physical property information and construction information, the accurate adjustment of the bit posture is realized by means of resistivity change rules when the bit passes through a layer interface, real-time inversion layer boundary distances and the like when the bit passes through the layer interface, the bit posture is accurately adjusted in real time, the accurate control of a well track is realized, and the drilling meeting rate of a coalbed methane reservoir is improved. The near-bit logging instrument and the bit posture adjustment method for the coal bed gas drilling have wide application prospects in the coal bed gas drilling exploitation, can obtain accurate reservoir structure information, electrical information and lithology information, discover fluctuation of a coal bed stratum as soon as possible, enable a bit to pass through the center of the coal bed as possible, and have very important significance in solving the problems encountered in the current coal bed gas drilling and improving the drilling meeting rate of the coal bed gas.
Drawings
Fig. 1 is a schematic structural diagram of a near-bit logging instrument for coal bed gas drilling according to the present invention.
The codes in fig. 1 are respectively: the drill collar is 1, the drill bit is 2, the transmitting coil is 3, the measuring coil is 4, the azimuth button electrode is 5, the azimuth gamma sensor is 6, the battery pack is 7, the clamp type centralizer is 8, and the screw is 9.
Fig. 2 is a flow chart of an implementation of the method for adjusting the posture of a drill bit for drilling coal bed methane.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention. In the present invention, unless otherwise specified, the devices and apparatuses used are all devices and apparatuses commonly known in the art, and the techniques used are all techniques commonly known in the art.
The invention is further described below with reference to examples:
example 1: as shown in fig. 1, the near-bit logging instrument for drilling coal bed gas comprises: drill collar 1, drill bit 2, transmitting coil 3, measuring coil 4, position button electrode 5, azimuth gamma sensor 6, group battery 7, drill collar 1 lower extreme is provided with drill bit 2, the drill collar 1 lower extreme immediately above drill bit 2 is around having embedded transmitting coil 3, drill collar 1 lateral wall face same horizontal position embedding above transmitting coil 3 is provided with azimuth button electrode 5 and azimuth gamma sensor 6, azimuth button electrode 5 and azimuth gamma sensor 6 circumference interval 180, measuring coil 4 that can receive transmitting coil 3's transmitting signal is around the drill collar 1 middle part embedding above azimuth button electrode 5 and azimuth gamma sensor 6, transmitting coil 3 and measuring coil 4 are the spiral coil, the inside embedding of drill collar 1 above measuring coil 4 is provided with group battery 7, group battery 7 is connected with transmitting coil 3, measuring coil 4 electricity respectively.
According to the near-bit logging instrument for coal bed gas drilling, a spiral annular transmitting coil 3 is arranged close to a bit 2, when the instrument works, alternating current with a certain frequency is applied to the transmitting coil 3 through a power supply battery pack 7, certain transmitting current is excited at the bit 2, and even if the bit 2 is equivalent to a transmitting electrode, an axial current value is obtained by a measuring coil 4. The resistivity information of the drill bit can be obtained through the conversion of the receiving signals of the measuring coil 4, the change of the resistivity of the reservoir in front of the drill bit 2 can be reflected more timely, and the working principle is equivalent to the lateral principle of magnetic excitation, so that the method is more suitable for high-resistivity strata such as coal bed methane. In addition, the azimuth button electrode 5 and the azimuth gamma sensor 6 are positioned at the same horizontal position of the drill collar 1, are circumferentially spaced by 180 degrees, namely are arranged back to back, resistivity and gamma logging information in different azimuth can be obtained simultaneously when the instrument rotates and works, resistivity and gamma imaging map information can be obtained through certain data conversion and image data processing, namely the instrument can obtain richer stratum information through one-time measurement, and the stratum information comprises bit resistivity reflecting the electrical information of a front reservoir, and resistivity profile and lithology profile reflecting the structure beside a well and stratum layer arrangement.
Example 2: as shown in fig. 1, a clamp type centralizer 8 is arranged on the outer side of the upper part of the drill collar 1.
Example 3: as shown in fig. 1, a screw 9 is vertically and fixedly arranged on the upper end surface of the drill collar 1.
Example 4: as shown in fig. 2, the method for adjusting the posture of the drill bit for drilling coal bed gas comprises the following steps: s1, constructing a geological model before drilling and designing a well track according to adjacent well data and seismic measurement data;
s2, drill bit resistivity, button electricity extremum in different directions and gamma measurement curve data are obtained in real time through a near-bit logging instrument for coal bed methane drilling in the drilling process;
s3, performing real-time forward modeling in the drilling process to obtain simulated bit resistivity, simulated average gamma curve and simulated average resistivity;
s4, acquiring well side construction information and stratum layer arrangement information, wherein the well side construction information comprises cracks, holes, stratum dip angles and azimuth angles;
s5, obtaining an average resistivity and an average gamma curve which change along with the well depth based on button resistivity and gamma measurement curves in different directions;
s5, comprehensively judging the relative position relation between the drill bit 2 and the reservoir by combining the acquired well side structure and stratum layer information, the drill bit resistivity, the average resistivity and the average gamma curve, and guiding the adjustment of the posture of the drill bit 2.
In the bit attitude adjustment method for coal bed gas drilling, bit resistivity, button electricity extremum in different directions and gamma measurement curve data are all measured by the near-bit logging instrument for coal bed gas drilling.
Example 5: as an optimization of the above embodiment 4, the step S4 specifically includes:
s41, acquiring button resistivity and gamma logging curves of different orientations according to well depth change through data calibration and time depth conversion based on button electrical extremum and gamma measurement curve data of different orientations acquired in real time;
s42, obtaining a resistivity imaging map and a gamma imaging map of full borehole coverage through an artifact data processing technology according to button resistivity and gamma measurement curves in different directions;
s43, acquiring the well-side construction information and the stratum layer information through an image data processing technology based on the resistivity imaging diagram and the gamma imaging diagram.
Example 6: as an optimization of the above embodiment, in step S5, the relative positional relationship of the drill bit 2 and the reservoir is comprehensively determined,
guiding the adjustment of the posture of the drill bit 2, specifically comprising:
s51, judging whether the drill bit 2 passes through a layer interface according to azimuth gamma and azimuth button resistivity logging information;
s52, when the drill bit 2 passes through the stratum interface, determining the adjustment posture of the drill bit 2 according to the average resistivity and the gamma response change: when the average resistivity increases and the average gamma decreases, the bit 2 pose is maintained; when the average resistivity decreases and the average gamma increases, the drill bit 2 is adjusted in the opposite direction.
In the invention, when the adjustment posture of the drill bit 2 is determined, whether the drill bit 2 is drilled down or cut up can be judged according to the formation dip angle, the formation azimuth information and the relative position relation between the well dip angle and the formation production state according to the conventional steps, and whether the drill bit 2 is drilled down or cut up can be determined according to the average resistivity and the gamma response change.
Example 7: as an optimization of the above embodiment 6, in step S5, it is determined whether the drill bit 2 passes through the layer interface according to the azimuth gamma and azimuth resistivity logging information, and if the logging instrument does not pass through the layer interface, the following steps are performed:
s54, comparing the bit resistivity, the average gamma curve and the average resistivity which are obtained in real time in the drilling process with the simulated bit resistivity, the average gamma curve and the average resistivity which are obtained in the step S3;
s55, updating the forward modeling model in the step S3 according to the comparison result to obtain the layer boundary distance between the drill bit 2 and the reservoir interface;
s56, when the layer boundary distance is smaller than the safe distance, the drill bit 2 is adjusted downwards; when the layer boundary distance is larger than the safety distance and smaller than the detection range, the posture of the drill bit 2 is kept; when the layer boundary distance is greater than the detection range, the drill bit 2 is adjusted upward.
If the instrument does not pass through the stratum interface, the multi-dimensional joint iteration inversion method is carried out to adjust and update the reservoir dynamic model by comparing the actually measured bit resistivity, the average resistivity and the average gamma with corresponding forward modeling values in the drilling process, the layer boundary distance between the bit 2 and the reservoir interface is obtained, and finally the adjustment posture of the bit 2 is determined according to the size, the safety distance and the detection range of the layer boundary distance.
Example 8: as an optimization of the above embodiment, the bit resistivity in step S2 is calculated as follows:
where RB is the bit resistivity, I is the received signal value of the measurement coil 4, and K is the scale factor.
According to the invention, the near-bit logging instrument for coal bed gas drilling is adopted for measuring the bit resistivity, when the instrument works, alternating current with a certain frequency is applied to the transmitting coil 3 through the power supply battery pack 7, a certain transmitting current is excited at the bit 2, the bit resistivity is obtained through calculation through the receiving signal of the measuring coil 4, and the change of the reservoir resistivity at the bit 2 is reflected timely. The scale factor in the formula is a fixed value of the instrument, and can be obtained by means of actual test or numerical simulation under model parameters.
The invention provides a near-bit logging instrument for coal bed gas drilling and a bit posture adjusting method, wherein the near-bit logging instrument increases the measurement of azimuth resistivity and the measurement of bit resistivity indicating the change of reservoir resistivity in front of a bit while maintaining the azimuth gamma measurement characteristic of the existing logging instrument, and overcomes the defects that the traditional geosteering system only depends on azimuth gamma guiding and has small measurement range of electromagnetic wave resistivity while drilling. According to the bit attitude adjustment method, a site directional well engineer can acquire the top information and the front information of a reservoir by using the acquired real-time measurement parameters, timely identify the change of a stratum, determine the position of a drilling tool in the coal seam, timely adjust the track of a borehole, drill the track along the spreading direction of the reservoir, and ensure the drilling meeting rate of the reservoir. According to the method for adjusting the bit posture, the relation between the formation attitude and the relative position of the bit is represented by combining a plurality of dimension measurement data such as reservoir electrical information, physical property information and construction information, the accurate adjustment of the bit posture is realized by means of resistivity change rules when the bit passes through a layer interface, real-time inversion layer boundary distances and the like when the bit passes through the layer interface, the bit posture is accurately adjusted in real time, the accurate control of a well track is realized, and the drilling meeting rate of a coalbed methane reservoir is improved. The near-bit logging instrument and the bit posture adjustment method for the coal bed gas drilling have wide application prospects in the coal bed gas drilling exploitation, can obtain accurate reservoir structure information, electrical information and lithology information, discover fluctuation of a coal bed stratum as soon as possible, enable a bit to pass through the center of the coal bed as possible, and have very important significance in solving the problems encountered in the current coal bed gas drilling and improving the drilling meeting rate of the coal bed gas.
The technical characteristics form the embodiment of the invention, have stronger adaptability and implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (8)
1. A near-bit logging tool for coal bed gas drilling, comprising: the drill collar comprises a drill collar, a drill bit, a transmitting coil, a measuring coil, an azimuth button electrode, an azimuth gamma sensor and a battery pack, wherein the drill bit is arranged at the lower end of the drill collar, the transmitting coil is embedded in the lower end of the drill collar, which is close to the upper part of the drill bit, the azimuth button electrode and the azimuth gamma sensor are embedded in the same horizontal position of the side wall surface of the drill collar above the transmitting coil, the azimuth button electrode and the azimuth gamma sensor are circumferentially spaced by 180 degrees, the measuring coil capable of receiving the transmitting signal of the transmitting coil is embedded in the middle part of the drill collar above the azimuth button electrode and the azimuth gamma sensor, the transmitting coil and the measuring coil are spiral coils, the battery pack is embedded in the drill collar above the measuring coil, and the battery pack is electrically connected with the transmitting coil and the measuring coil respectively.
2. The near-bit logging tool for coal bed methane drilling of claim 1, wherein the outer side of the upper part of the drill collar is provided with a clamp type centralizer.
3. The near-bit logging instrument for coal bed methane drilling according to claim 1 or 2, wherein the upper end face of the drill collar is vertically and fixedly provided with a screw.
4. A method for adjusting the posture of a drill bit for drilling coal bed methane, which is implemented by using the near-bit logging instrument for drilling coal bed methane according to any one of claims 1 to 3, and is characterized by comprising the following steps:
s1, constructing a geological model before drilling and designing a well track according to adjacent well data and seismic measurement data;
s2, drill bit resistivity, button electricity extremum in different directions and gamma measurement curve data are obtained in real time through a near-bit logging instrument for coal bed methane drilling in the drilling process;
s3, performing real-time forward modeling in the drilling process to obtain simulated bit resistivity, simulated average gamma curve and simulated average resistivity;
s4, acquiring well side construction information and stratum layer arrangement information, wherein the well side construction information comprises cracks, holes, stratum dip angles and azimuth angles;
s5, obtaining an average resistivity and an average gamma curve which change along with the well depth based on button resistivity and gamma measurement curves in different directions;
s5, comprehensively judging the relative position relation between the drill bit and the reservoir by combining the acquired well side structure and stratum layer information, the drill bit resistivity, the average resistivity and the average gamma curve, and guiding the adjustment of the posture of the drill bit.
5. The method for adjusting the posture of a drill bit for drilling coal bed methane according to claim 4, wherein the step S4 specifically comprises:
s41, acquiring button resistivity and gamma logging curves of different orientations according to well depth change through data calibration and time depth conversion based on button electrical extremum and gamma measurement curve data of different orientations acquired in real time;
s42, obtaining a resistivity imaging map and a gamma imaging map of full borehole coverage through an artifact data processing technology according to button resistivity and gamma measurement curves in different directions;
s43, acquiring the well-side construction information and the stratum layer information through an image data processing technology based on the resistivity imaging diagram and the gamma imaging diagram.
6. The method for adjusting the posture of a drill bit for drilling coal bed methane according to claim 4 or 5, wherein in step S5, the relative positional relationship between the drill bit and the reservoir is comprehensively determined, and the adjustment of the posture of the drill bit is guided, specifically comprising:
s51, judging whether the drill bit passes through a layer interface according to azimuth gamma and azimuth button resistivity logging information;
s52, when the drill bit passes through the stratum interface, determining the adjustment posture of the drill bit according to the average resistivity and the gamma response change: maintaining bit attitude as average resistivity increases and average gamma decreases; when the average resistivity decreases and the average gamma increases, the bit is adjusted in the opposite direction.
7. The method according to claim 6, wherein in step S5, whether the drill bit passes through the layer interface is determined based on azimuth gamma and azimuth resistivity logging information, and if the logging instrument does not pass through the layer interface, the following steps are performed:
s54, comparing the bit resistivity, the average gamma curve and the average resistivity which are obtained in real time in the drilling process with the simulated bit resistivity, the average gamma curve and the average resistivity which are obtained in the step S3;
s55, updating the forward modeling model in the step S3 according to the comparison result to obtain the layer boundary distance between the drill bit and the reservoir interface;
s56, when the layer boundary distance is smaller than the safe distance, the drill bit is adjusted downwards; when the layer boundary distance is larger than the safety distance and smaller than the detection range, the posture of the drill bit is kept; when the layer boundary distance is larger than the detection range, the drill bit is adjusted upwards.
8. The bit attitude adjustment method for coal bed gas drilling according to any one of claims 4 to 7, wherein the bit resistivity in step S2 is calculated as follows:
wherein RB is bit resistivity, I is a received signal value of a measuring coil, and K is a scale factor.
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