CN110344821B - Underground while-drilling communication method and system - Google Patents
Underground while-drilling communication method and system Download PDFInfo
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- CN110344821B CN110344821B CN201810306340.5A CN201810306340A CN110344821B CN 110344821 B CN110344821 B CN 110344821B CN 201810306340 A CN201810306340 A CN 201810306340A CN 110344821 B CN110344821 B CN 110344821B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses an underground while-drilling communication method and a control system. The method comprises the following steps: monitoring the change condition of the formation resistivity of the underground communication position; judging whether a communication mode needs to be adjusted or not when the stratum resistivity of the communication position changes, and determining a new communication mode according to the stratum resistivity of the communication position when the communication mode needs to be adjusted, wherein the new communication mode comprises signal transmitting frequency and/or signal output power; and performing downhole while-drilling communication based on the new communication mode. According to the method, the communication mode can be automatically adjusted, and the communication mode is matched with the current geological environment, so that the transmission stability of the electromagnetic wave signals is improved, and the transmission depth of the electromagnetic wave signals is improved.
Description
Technical Field
The invention relates to the field of oil and gas exploitation, in particular to a downhole communication while drilling method and system.
Background
Measurement while drilling is an indispensable technical means in construction of directional wells and horizontal wells. Due to the restriction of drilling depth, stratum environment and other conditions, the measurement-while-drilling data cannot be transmitted to the ground from the measurement-while-drilling instrument in a wired transmission mode in many drilling construction scenes.
Currently, an electromagnetic measurement while drilling (EM-MWD) system is commonly used, which comprises a communication device while drilling that uses low frequency electromagnetic waves to transmit information, which can be normally used in drilling projects using liquid and gas phase drilling fluids. However, the information transmission of the EM-MWD system is essentially a special wireless communication system, and its particularity is that electromagnetic waves propagate in a lossy medium, the transmission depth is affected by the formation medium, and the transmission depth does not reach the level of the conventional MWD.
Particularly, in the actual drilling process, when the communication device while drilling moves along with the drill bit at different positions in the stratum, particularly when interlayers exist among the different positions, the properties of stratum media through which electromagnetic waves for data transmission pass can be obviously changed. This makes the electromagnetic wave signal that is finally transmitted to the surface unstable, and there is a possibility of transmission failure. This greatly affects the formation adaptability of the electromagnetic communication while drilling device and the range of use of the instrument.
Disclosure of Invention
The invention provides a downhole communication while drilling method, which comprises the following steps:
monitoring the change condition of the formation resistivity of the underground communication position;
judging whether a communication mode needs to be adjusted or not when the stratum resistivity of the communication position changes, and determining a new communication mode according to the stratum resistivity of the communication position when the communication mode needs to be adjusted, wherein the new communication mode comprises signal transmitting frequency and/or signal output power;
And performing downhole while-drilling communication based on the new communication mode.
In one embodiment, determining whether the communication mode needs to be adjusted when the formation resistivity at the communication position changes includes:
judging whether the change of the formation resistivity of the communication position is stable or not;
and judging whether the communication mode needs to be adjusted or not when the change of the formation resistivity of the communication position is stable.
In one embodiment, determining whether the communication mode needs to be adjusted includes:
acquiring an ideal communication mode corresponding to the formation resistivity of the communication position;
and judging whether the ideal communication mode is consistent with the current communication mode, if not, judging that the communication mode needs to be adjusted.
In one embodiment:
when the formation resistivity is 0-3 ohm-meter, the signal transmitting frequency of the corresponding ideal communication mode is 2 HZ;
when the resistivity of the stratum is 3-10 ohm-meter and does not comprise 3 ohm-meter, the signal transmission frequency of the corresponding ideal communication mode is 5 HZ;
when the formation resistivity is 10-500 ohm-meter and does not include 10 ohm-meter, the signal transmitting frequency of the corresponding ideal communication mode is 10 HZ;
when the formation resistivity is 500-5000 ohm meters and 500 ohm meters is not included, the signal transmission frequency of the corresponding ideal communication mode is 5 HZ;
When the formation resistivity is more than 5000 ohm-meter, the signal transmission frequency of the corresponding ideal communication mode is 2 HZ.
In one embodiment, the downhole communication while drilling is performed based on the new communication mode, wherein:
sending a communication mode change notification to the surface based on the original communication mode before performing downhole while drilling communication based on the new communication mode.
In one embodiment:
when the stratum resistivity at the communication position changes, the sending of the underground measurement while drilling data is suspended and the underground measurement while drilling data needing to be sent is cached;
and sending the cached underground measurement while drilling data after the communication mode of the underground communication while drilling is determined.
The invention also provides a downhole communication while drilling control system, which comprises:
the formation resistivity acquisition module is configured to acquire the formation resistivity change condition of the underground communication while drilling position;
and the communication mode decision module is configured to judge whether a communication mode needs to be adjusted or not when the formation resistivity of the communication position changes, determine a new communication mode according to the formation resistivity of the communication position when the communication mode needs to be adjusted, and output the new communication mode, wherein the new communication mode is used for configuring an electromagnetic wave emission mode of the underground while-drilling communication equipment.
In one embodiment, the communication mode decision module comprises a formation resistivity change monitoring unit, wherein:
the formation resistivity change monitoring unit is configured to determine whether the formation resistivity change at the communication position is stable;
the communication mode decision module is configured to determine whether the communication mode needs to be adjusted when the formation resistivity change at the communication position is stable.
In one embodiment, the communication mode decision module includes a first memory storing ideal communication modes corresponding to different formation resistivities, the communication mode decision module configured to:
calling an ideal communication mode corresponding to the formation resistivity of the communication position from the first memory when judging whether the communication mode needs to be adjusted;
and judging whether the ideal communication mode is consistent with the current communication mode, if not, judging that the communication mode needs to be adjusted.
In one embodiment, the system further comprises a data buffer, wherein:
the communication mode decision module is further configured to output a communication pause command when the formation resistivity of the communication position changes, wherein the communication pause command is used for controlling the downhole while-drilling communication equipment to pause the sending of downhole while-drilling measurement data;
The data buffer is configured to buffer downhole measurement-while-drilling data that needs to be transmitted when transmission of the downhole measurement-while-drilling data is suspended and to output the buffered downhole measurement-while-drilling data to the downhole communication-while-drilling device when transmission of the downhole measurement-while-drilling data is started again.
According to the method, the communication mode can be automatically adjusted, and the communication mode is matched with the current geological environment, so that the transmission stability of the electromagnetic wave signals is improved, and the transmission depth of the electromagnetic wave signals is improved.
Additional features and advantages of the invention will be set forth in the description which follows. Also, some of the features and advantages of the invention will be apparent from the description, or may be learned by practice of the invention. The objectives and some of the advantages of the invention may be realized and attained by the process particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIGS. 1 and 2 are flowcharts of methods according to various embodiments of the invention;
FIG. 3 is a partial flow diagram of a method according to an embodiment of the invention;
fig. 4-7 are schematic system configurations according to various embodiments of the present invention.
Detailed Description
The following detailed description will be provided for the embodiments of the present invention with reference to the accompanying drawings and examples, so that the practitioner of the present invention can fully understand how to apply the technical means to solve the technical problems, achieve the technical effects, and implement the present invention according to the implementation procedures. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
Measurement while drilling is an indispensable technical means in construction of directional wells and horizontal wells. Due to the restriction of drilling depth, stratum environment and other conditions, measurement-while-drilling data cannot be transmitted to the ground from a measurement-while-drilling instrument in a wired transmission mode in many drilling construction scenes.
Currently, an electromagnetic measurement while drilling (EM-MWD) system is commonly used, which includes a communication device while drilling that transmits information using low frequency electromagnetic waves, which can be normally used in drilling projects using liquid and gas phase drilling fluids. However, the information transmission of the EM-MWD system is essentially a special wireless communication system, and the particularity is that electromagnetic waves propagate in a lossy medium, the transmission depth is influenced by a formation medium, and the transmission depth is not as high as that of the conventional MWD.
Particularly, in the actual drilling process, when the communication device while drilling moves along with the drill bit at different positions in the stratum, particularly when interlayers exist among the different positions, the properties of stratum media through which electromagnetic waves for data transmission pass can be obviously changed. This makes the electromagnetic wave signal that is finally transmitted to the surface unstable, and there is a possibility of transmission failure. This greatly affects the formation adaptability of the electromagnetic communication while drilling device and the range of use of the instrument.
Aiming at the problems, the invention provides a downhole communication while drilling method. According to the method, the transmission mode of the electromagnetic waves is adjusted in real time according to the stratum medium condition experienced in the process of transmitting the electromagnetic waves to the ground from the communication while drilling device, so that the electromagnetic wave signals can be stably received by a ground system, and the condition of data transmission failure is avoided. Specifically, the transmission mode of the electromagnetic wave includes a signal transmission frequency and/or a signal output power.
Specifically, in the actual drilling process, when the drill bit is directly switched at different stratum levels, particularly when an interlayer exists between the levels, a more direct expression is that the stratum resistivity at the drill bit jumps along with the interlayer. The formation resistivity is an important factor influencing the transmission state of electromagnetic waves in the formation. Therefore, in the method of the present invention, the emission pattern of the electromagnetic wave is adjusted according to the formation resistivity, that is, the emission pattern of the electromagnetic wave for data transmission is linked with the formation resistivity of the electromagnetic wave emission position. When the position of the communication while drilling device changes, the formation resistivity at the communication while drilling device changes, the signal emission frequency and/or the signal output power of the electromagnetic waves are changed accordingly, and therefore the electromagnetic waves can be stably transmitted to the earth surface all the time.
According to the method, the communication mode can be automatically adjusted, and the communication mode is matched with the current geological environment, so that the transmission stability of the electromagnetic wave signals is improved, and the transmission depth of the electromagnetic wave signals is improved. Furthermore, the method can be independently implemented in the underground environment, so that the condition that most underground operation environments only can maintain data one-way transmission is met.
The detailed flow of a method according to an embodiment of the invention is described in detail below based on the accompanying drawings, the steps shown in the flow chart of which can be executed in a computer system containing instructions such as a set of computer executable instructions. Although a logical order of steps is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
As shown in FIG. 1, in one embodiment, the method of the present invention comprises the steps of:
monitoring formation resistivity changes at the downhole communication location (S100);
judging whether the formation resistivity changes (S110), if not, continuing to execute the step S100;
when the formation resistivity at the communication position changes, judging whether the communication mode (signal transmitting frequency and/or signal output power) needs to be adjusted or not (S120), and if not, continuing to perform the underground while-drilling communication in the current communication mode (S130);
Determining a new communication mode according to the formation resistivity of the communication position when the communication mode needs to be adjusted (S140);
and performing downhole communication while drilling based on the new communication mode (S150).
Specifically, in one embodiment, the communication mode is linked in real time with the formation resistivity at the communication location. That is, unless there is a higher-level operation, the determination of step S120 is always yes. And when the formation resistivity changes, determining a new communication mode according to the changed formation resistivity.
Further, it is contemplated that the change in formation resistivity may not be stable and may jump back to the original state after an abrupt change. Therefore, in one embodiment, the determination of whether the communication mode needs to be adjusted is not immediately made after the formation resistivity changes, but the change of the formation resistivity is monitored for a specific time period, and the determination of whether the communication mode needs to be adjusted is made after the change of the formation resistivity is confirmed to be stable.
Specifically, as shown in fig. 2, after the formation resistivity at the communication position changes, the change in the formation resistivity at the communication position is monitored, and whether the change in the formation resistivity is stable or not is determined (S221).
When the formation resistivity at the communication location changes and is unstable, the change in the formation resistivity at the communication location continues to be monitored. Specifically, in one embodiment, it is not determined whether the communication mode needs to be adjusted, i.e., the data is still transmitted in the original communication mode.
When the change of the formation resistivity at the communication position is stable, it is judged whether the communication mode needs to be adjusted (S222).
Further, considering that frequent changes of the transmission mode may cause a large pressure on the transmission and reception devices of the communication system, in an embodiment, the transmission mode of the electromagnetic wave is not changed immediately when the formation resistivity changes, but the transmission mode is changed when the change range of the formation resistivity exceeds a preset interval. Specifically, when judging whether the communication mode needs to be adjusted, whether the change amplitude of the formation resistivity exceeds a preset interval is judged.
Specifically, in one embodiment, a plurality of ideal communication modes are determined according to the transmission of electromagnetic waves in the formation media with different formation resistivities. Each ideal communication mode corresponds to a formation resistivity interval. That is, the electromagnetic waves emitted in the ideal communication mode can be smoothly transmitted in the formation medium of the formation resistivity interval corresponding to the electromagnetic waves. Conversely, when the electromagnetic waves not transmitted in the ideal communication mode pass through the formation medium corresponding to the formation resistivity interval, a transmission failure is likely to occur. Therefore, whether the current electromagnetic wave emission mode needs to be changed can be judged only by judging whether the current electromagnetic wave emission mode is the ideal communication mode corresponding to the current formation resistivity.
Specifically, as shown in fig. 3, in an embodiment, the step of determining whether the communication mode needs to be adjusted includes:
acquiring an ideal communication mode corresponding to the formation resistivity of the communication position (S300);
judging whether the ideal communication mode determined in the previous step is consistent with the current communication mode (S310);
if not, judging that the communication mode needs to be adjusted (S320);
if they match, it is determined that the communication mode does not need to be adjusted (S330).
Specifically, in one embodiment:
when the stratum resistivity is 0-3 ohm-meter, the signal transmitting frequency of the corresponding ideal communication mode is 2 HZ;
when the resistivity of the stratum is 3-10 ohm meter (excluding 3 ohm meter), the signal transmission frequency of the corresponding ideal communication mode is 5 HZ;
when the stratum resistivity is 10-500 ohm meter (excluding 10 ohm meter), the signal transmission frequency of the corresponding ideal communication mode is 10 HZ;
when the resistivity of the stratum is 500 ohm meter to 5000 ohm meter (excluding 500 ohm meter), the signal transmitting frequency of the corresponding ideal communication mode is 5 HZ;
when the formation resistivity is 5000 ohm · m or more, the signal transmission frequency of the corresponding ideal communication mode is 2 HZ.
Furthermore, the electromagnetic waves emitted in the ideal communication mode can be smoothly transmitted in the formation medium of the formation resistivity interval corresponding to the electromagnetic waves. Therefore, in one embodiment, when the communication mode needs to be adjusted, the ideal communication mode corresponding to the current formation resistivity is directly used as the new communication mode.
Further, when the data sending side changes the communication mode, the data receiving side also needs to perform corresponding receiving mode conversion. Thus, in one embodiment, a communication mode change notification is sent to the surface based on the original communication mode prior to conducting downhole communication while drilling based on the new communication mode. Further, to prevent a failure in sending or receiving the communication mode change notification, in one embodiment, the communication mode change notification is sent to the surface multiple times based on the original communication mode before the downhole communication while drilling is performed based on the new communication mode. Specifically, in one embodiment, a communication mode change notification is sent to the surface 3 times based on the original communication mode before downhole communication while drilling is performed based on the new communication mode.
Further, in some application scenarios, it is desirable to continuously transmit measurement-while-drilling data. However, in the process of performing the communication mode adjustment determination and adjusting the communication mode, it is not possible to determine whether or not data transmission is possible smoothly. Therefore, in order to avoid data loss, in one embodiment, the sending of the downhole measurement while drilling data is suspended when the formation resistivity at the communication position changes, so that data loss caused by the fact that the surface cannot receive the data correctly after the data are sent is avoided. Meanwhile, the underground measurement while drilling data needing to be sent is cached from the moment when the sending of the underground measurement while drilling data is suspended, and the cached underground measurement while drilling data is sent after the communication mode of the underground communication while drilling is determined, so that the ground can receive the complete underground measurement while drilling data.
Further, based on the method provided by the invention, the invention also provides a downhole communication while drilling system. As shown in FIG. 4, in one embodiment, the system includes:
a formation resistivity acquisition module 410 configured to acquire a formation resistivity variation at the downhole communication location;
and the communication mode decision module 420 is configured to judge whether the communication mode needs to be adjusted or not when the formation resistivity of the communication position changes, and determine and output a new communication mode according to the formation resistivity of the communication position when the communication mode needs to be adjusted.
The new communication mode output by the communication mode decision module 420 is used for configuring an electromagnetic wave emission mode of the downhole while-drilling communication device (communication module 400), so that the communication module 400 realizes data communication between the downhole while-drilling instrument 401 and the surface device 402.
A communication module 430 configured to communicate downhole while drilling based on the communication mode determined by the communication mode decision module 420.
Further, in one embodiment, the formation resistivity acquisition module 410 is provided with a stand-alone formation resistivity measurement unit. In another embodiment, the formation resistivity acquisition module 410 is provided with a data acquisition interface that acquires formation resistivity data from a formation resistivity measurement device of a measurement while drilling instrument.
Further, in an embodiment, the formation resistivity acquisition module 410 performs signal filtering and other processing and a \ D conversion on the acquired resistivity signal by the measurement module, and sends the processed digital signal to the communication mode decision module 420.
Further, in an embodiment, the downhole communication while drilling device (communication module 400) is composed of a power amplifier and a corresponding interface circuit, and is configured to perform power amplification on the electrical signal with information to be transmitted, which is output after being coded and modulated by the signal digital processing and controller module, and transmit the amplified electromagnetic signal through the electromagnetic signal transceiver antenna.
Further, in an embodiment, when the communication module 400 receives the new communication mode, the transmission configuration of the electromagnetic wave signal is adjusted according to the frequency and power included in the new communication mode, and the frequency-selecting signal is sent to the ground device 402 to adjust the receiver of the ground device 402 for performing corresponding signal receiving processing.
Further, the communication module 400 includes a signal conditioning module. The signal conditioning module is composed of circuit units such as a signal coupling interface, a programmable automatic gain amplifier, a low-pass filter and the like, and is used for amplifying and filtering electromagnetic signals received by the antenna and processing the received electromagnetic signals into signals suitable for further processing in a later stage. The signal coupling unit comprises an impedance converter and an interface circuit, and has the functions of completing the connection control of the antenna, the transmitter and the receiver and matching the impedance between the antenna and the amplifier; the programmable automatic gain amplifier amplifies the detected electromagnetic signal level to a proper level, and consists of a multi-stage amplifier, and the gain of the programmable automatic gain amplifier can be automatically set by a controller according to the signal level; the low-pass filter is used for filtering the received electromagnetic signals and filtering interference noise outside a set passband.
Further, as shown in fig. 5, in an embodiment, the communication mode decision module 520 includes a formation resistivity change monitoring unit 521, wherein:
the formation resistivity change monitoring unit 521 is configured to determine whether the formation resistivity change at the communication position is stable;
the communication mode decision module 520 is configured to determine whether the communication mode needs to be adjusted when the formation resistivity change at the communication location is stable.
Further, as shown in fig. 6, in one embodiment, the communication mode decision module 620 includes a memory 622, and the memory 622 stores ideal communication modes corresponding to different formation resistivities.
The communication mode decision module 620 is configured to:
calling an ideal communication mode corresponding to the formation resistivity of the communication position from the memory 622 when judging whether the communication mode needs to be adjusted;
and judging whether the ideal communication mode is consistent with the current communication mode, if not, judging that the communication mode needs to be adjusted.
Further, as shown in fig. 7, in an embodiment, the system further includes a data buffer 740, wherein:
the communication mode decision module 720 is further configured to output a communication pause command when the formation resistivity at the communication position changes, wherein the communication pause command is used for controlling the downhole while-drilling communication device (the communication module 700) to pause the sending of the downhole while-drilling measurement data;
The data buffer 740 is configured to buffer downhole measurement-while-drilling data that needs to be transmitted when transmission of the downhole measurement-while-drilling data is suspended and to output the buffered downhole measurement-while-drilling data to the downhole communication-while-drilling device (communication module 700) when transmission of the downhole measurement-while-drilling data is started again. Such that unsent downhole measurement-while-drilling data is transmitted by the communication module 700 to the surface unit 702.
Further, in one embodiment, the downhole communication while drilling device controlled by the proposed system includes a communication while drilling module at the drill bit. The system and the while-drilling communication module are arranged near the drill bit together to provide communication support for the underground while-drilling measuring instrument near the drill bit.
Further, in an embodiment, the downhole communication while drilling device controlled by the system provided by the invention further comprises a communication repeater. When electromagnetic wave signals transmitted to the ground by a communication-while-drilling module at the drill bit are weak, the communication repeater and the system are put into the system. The repeater firstly receives an electromagnetic signal sent by the communication-while-drilling module. The system is hung with the repeater to acquire formation resistivity data in real time, and automatically adjusts the communication mode of the communication repeater for forwarding signals according to the current formation resistivity, so that the communication mode of the communication repeater for forwarding signals is adaptive to the formation resistivity, and the purpose of improving the transmission depth of the communication module while drilling is achieved.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. There are various other embodiments of the method of the present invention. Various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications should fall within the scope of the appended claims.
Claims (3)
1. The downhole communication while drilling method is applied to the occasions that an interlayer exists in a stratum at a downhole communication position and stratum resistivity jumps along with the interlayer, and the method comprises the following steps:
monitoring the change condition of the formation resistivity of the underground communication position;
and when the formation resistivity of the communication position changes, judging whether the communication mode needs to be adjusted or not, wherein, judging whether the change of the stratum resistivity at the communication position is stable or not, and judging whether the communication mode needs to be adjusted or not when the change is stable, wherein, whether the variation amplitude of the formation resistivity exceeds a preset interval or not is judged, whether the communication mode needs to be adjusted or not is continuously judged when the variation amplitude of the formation resistivity exceeds the preset interval, wherein, an ideal communication mode corresponding to the stratum resistivity of the communication position is obtained, and whether the ideal communication mode is consistent with the current communication mode or not is judged, if not, determining that the communication mode needs to be adjusted, directly determining the ideal communication mode corresponding to the current formation resistivity as a new communication mode so as to link the communication mode with the formation resistivity at the communication position in real time, wherein the new communication mode comprises a signal transmission frequency and/or a signal output power;
Performing downhole communication while drilling based on the new communication mode, wherein,
when the formation resistivity is 0-3 ohm-meter, the signal transmitting frequency of the corresponding ideal communication mode is 2 HZ;
when the formation resistivity is 3-10 ohm-meter and does not comprise 3 ohm-meter, the signal transmitting frequency of the corresponding ideal communication mode is 5 HZ;
when the formation resistivity is 10-500 ohm-meter and does not comprise 10 ohm-meter, the signal transmitting frequency of the corresponding ideal communication mode is 10 HZ;
when the formation resistivity is 500-5000 ohm meters and does not include 500 ohm meters, the signal transmission frequency of the corresponding ideal communication mode is 5 HZ;
when the formation resistivity is more than 5000 ohm meters, the signal transmitting frequency of the corresponding ideal communication mode is 2 HZ;
when the stratum resistivity at the communication position changes, the sending of the underground measurement while drilling data is suspended and the underground measurement while drilling data needing to be sent is cached;
and sending the cached underground measurement while drilling data after the communication mode of the underground communication while drilling is determined.
2. The method of claim 1, wherein communicating while drilling is performed downhole based on the new communication mode, wherein:
sending a communication mode change notification to the surface based on the original communication mode before performing downhole while drilling communication based on the new communication mode.
3. A downhole communication while drilling control system is applied to the occasion that a stratum at a downhole communication position has an interlayer and stratum resistivity jumps along with the interlayer, wherein the system comprises the following components:
the formation resistivity acquisition module is configured to acquire a formation resistivity change condition of a downhole communication while drilling position;
a communication mode decision module configured to determine whether a communication mode needs to be adjusted when the formation resistivity of the communication position changes, determine a new communication mode according to the formation resistivity of the communication position and output the new communication mode when the communication mode needs to be adjusted so as to link the communication mode with the formation resistivity of the communication position in real time, wherein the new communication mode is used for configuring an electromagnetic wave emission mode of the downhole while-drilling communication equipment, and the communication mode decision module is configured to:
the formation resistivity change monitoring unit is configured to determine whether the formation resistivity change at the communication position is stable;
the communication mode decision module is configured to judge whether the communication mode needs to be adjusted when the formation resistivity change at the communication position is stable, wherein whether the change amplitude of the formation resistivity exceeds a preset interval is judged, whether the communication mode needs to be adjusted is continuously judged when the change amplitude of the formation resistivity exceeds the preset interval, wherein,
The communication mode decision module includes a first memory storing ideal communication modes corresponding to different formation resistivities, the communication mode decision module configured to:
calling an ideal communication mode corresponding to the formation resistivity of the communication position from the first memory when judging whether the communication mode needs to be adjusted;
judging whether the ideal communication mode is consistent with the current communication mode, if not, judging that the communication mode needs to be adjusted, and directly determining the ideal communication mode corresponding to the current formation resistivity as a new communication mode, wherein,
when the formation resistivity is 0-3 ohm-meter, the signal transmitting frequency of the corresponding ideal communication mode is 2 HZ;
when the formation resistivity is 3-10 ohm-meter and does not comprise 3 ohm-meter, the signal transmitting frequency of the corresponding ideal communication mode is 5 HZ;
when the formation resistivity is 10-500 ohm-meter and does not include 10 ohm-meter, the signal transmitting frequency of the corresponding ideal communication mode is 10 HZ;
when the formation resistivity is 500-5000 ohm meters and does not comprise 500 ohm meters, the signal transmitting frequency of the corresponding ideal communication mode is 5 HZ;
when the formation resistivity is more than 5000 ohm meter, the signal transmitting frequency of the corresponding ideal communication mode is 2 HZ;
The communication mode decision module is further configured to output a communication pause command when the formation resistivity of the communication position changes, wherein the communication pause command is used for controlling the downhole while-drilling communication equipment to pause the sending of downhole while-drilling measurement data;
the data buffer is configured to buffer downhole measurement-while-drilling data that needs to be transmitted when transmission of the downhole measurement-while-drilling data is suspended and output the buffered downhole measurement-while-drilling data to the downhole communication-while-drilling device when transmission of the downhole measurement-while-drilling data is started again.
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