CN105840186B - Underground low-power-consumption control method and circuit based on pressure waves - Google Patents
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- 238000009530 blood pressure measurement Methods 0.000 description 2
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Abstract
The invention provides an underground low-power-consumption control circuit based on pressure wave awakening, which comprises a pressure pump, a pressure wave dormancy awakening system, an underground measurement control system and a power supply management system, wherein the pressure pump is used for generating a coded pressure pulse signal; the pressure wave dormancy awakening system receives a coded pressure pulse signal sent by the pressure pump, processes and decodes the data, and sends the data to the underground measurement control system; the power management system is used for supplying power for the pressure wave dormancy awakening system and the underground measurement control system. The invention realizes the dormancy/awakening function of the underground measurement control system controlled by the ground equipment, improves the electric energy utilization efficiency of the underground measurement control system, reduces the useless power loss, greatly reduces the measurement and storage of useless data and prolongs the underground working time of the intelligent drilling tool.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas drilling, and particularly relates to an underground low-power-consumption control method and circuit based on pressure waves.
Background
With the development of oil exploration technology, oil drilling equipment develops towards the direction of intellectualization, integration and miniaturization, and an intelligent drilling tool with integration of mechanical, electrical and hydraulic systems becomes a main force in the field of oil drilling. However, the downhole measurement control system in the intelligent drilling tool operates stably for a long period of time, and requires a stable dc power supply. The high-temperature lithium battery is used as a power supply, has the advantages of simple structure, stable output voltage and suitability for various stages of petroleum drilling, but has the defect of insufficient power supply in long-time underground work. Even if the underground measurement control system adopts low-power-consumption electronic components, long-time underground work needs to be maintained, the number of the battery packs can be increased continuously, and the size of the power supply short section is increased. In addition, in different stages of oil drilling, such as tool running-in, standby, lifting-out and the like, the whole underground measurement control system is not required to work, and meaningless data acquisition only accelerates the consumption of power supply energy.
Therefore, research on a control circuit and a method with functions of dormancy and awakening is used for reducing power loss of a downhole electronic measurement and control unit, and has practical and important significance.
Disclosure of Invention
In view of the above, the present invention provides a downhole low power consumption control method based on pressure waves, so as to reduce power consumption of a downhole electronic measurement and control unit.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
on one hand, the application provides a downhole low-power-consumption control method based on pressure waves, which comprises the following steps:
step 1, generating a coded pressure pulse signal by a ground pressure pump 100;
step 2, acquiring a coded pressure pulse signal through a pressure sensor 2001 in the pressure wave dormancy awakening system 200, amplifying the pressure pulse signal by a signal conditioning circuit 2002, sending the amplified pressure pulse signal into a microprocessor 2003, and storing the amplified pressure pulse signal in a storage circuit 2004;
step 3, reading the level of the output signal line of the signal conditioning circuit by the microprocessor, and detecting the first rising edge of the pressure pulse signal;
step 4, if the pressure increase exceeds P Mpa at intervals of t minutes, determining that a first rising edge is detected, and if the first rising edge is not detected, repeating the step 3;
step 5, after the microprocessor detects the first rising edge of the pressure pulse signal, reading the current clock and recording the time parameter t1 at the moment, and adding 1 to the rising edge counting parameter;
step 6: continuously reading the level of the signal line output by the signal conditioning circuit by the microprocessor, and detecting the rising edge of the pressure pulse signal;
and 7: if the pressure increases over P Mpa at intervals of t minutes, a rising edge is considered to be detected, and if no rising edge is detected, the step 6 is repeated;
and 8: after the microprocessor detects the rising edge of the pressure pulse signal, reading the current clock and recording a time parameter ti at the moment, wherein 2< ═ i < ═ M;
step 9, the microprocessor calculates a time interval Ti between two adjacent rising edges, wherein 1< ═ i < ═ M-1;
step 10: the microprocessor compares the calculation result with a preset pulse signal sampling interval, judges whether the rising edge interval is effective or not, and returns to the step 6 if the rising edge interval is not effective;
if the rising edge interval is effective, adding 1 to the rising edge counting parameter and recording a rising edge time interval parameter Ti to perform step 11;
step 11, judging whether the number of the collected rising edges is M, wherein M is the length of the coded pressure pulse signal, and turning to step 6 if the number of the collected effective rising edges is less than M;
step 12: after all M rising edges are detected, the microprocessor 2003 decodes the pressure pulse signal;
step 13, the microprocessor 2003 passes the decoded information through I2The C bus is sent into the underground measurement control system 300, and corresponding modules in the underground measurement control system 300 are awakened/dormant;
and 14, starting working or entering a dormant state of a corresponding module of the underground measurement control system, generating a feedback signal and transmitting the feedback signal to the ground, and continuously monitoring signal line level conversion by the microprocessor 2003 to wait for the arrival of the next instruction.
Furthermore, each frame of the coded pressure pulse signal comprises a synchronization word, a control command and a check bit, the total length of the coded pressure pulse signal is M rising edges, and the interval between the first rising edge and the second rising edge is fixed to be T1 and used for clock synchronization; a second rising edge and a third rising edge interval, a third rising edge and a fourth rising edge interval, and an … … (M-2) th rising edge and an M-1 th rising edge interval are control instructions, and are marked as Ti, 2< ═ i < ═ M-2, and are used for determining that a corresponding functional module of the downhole measurement control system 300 to be awakened/dormant enters an awakened/dormant state, the lowest bit of the control instruction is a dormancy/awakening setting bit, and the rest bits of the control instruction are sub-module bits selected by the downhole measurement control system 300; the interval between the M-1 th rising edge and the Mth rising edge is a check bit.
Compared with the prior art, the underground low-power-consumption control method has the following advantages:
the dormant/awakening function of the underground measurement control system 300 controlled by the ground equipment is realized, the electric energy utilization efficiency of the underground measurement control system 300 is improved, the useless power loss is reduced, the measurement and storage of useless data are greatly reduced, and the underground working time of the underground measurement control system 300 is prolonged.
On the other hand, the pressure wave-based downhole low-power-consumption control circuit of the pressure wave-based downhole low-power-consumption control method is applied to reduce the power loss of the downhole electronic measurement and control unit.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a pressure wave based downhole low-power control circuit applying the pressure wave based downhole low-power control method comprises a pressure pump 100, a pressure wave dormancy awakening system 200, a downhole measurement control system 300 and a power management system 400, wherein the pressure pump 100 is used for generating a coded pressure pulse signal; the pressure wave dormancy awakening system 200 receives a coded pressure pulse signal sent by the pressure pump, processes and decodes the data, and then sends the data to the underground measurement control system 300; the power management system 400 is used to power the pressure wave sleep wake-up system 200 and the downhole measurement control system 300.
Further, the pressure wave sleep and wake-up system 200 comprises a pressure sensor 2001, a signal conditioning circuit 2002, a microprocessor 2003 and a storage circuit 2004 which are connected in sequence, the pressure sensor 2001 receives encoded pressure information, the signal conditioning circuit 2002 amplifies an output signal of the pressure sensor 2001, the amplified output signal is sent to the microprocessor 2003 to decode a pressure pulse signal, the decoded pressure information is stored in the storage circuit 2004, and the microprocessor 2003 outputs the decoded information to the downhole measurement control system 300.
Further, the signal conditioning circuit 2002 comprises a first operational amplifier U1 and its peripheral circuits, and the first operational amplifier U1 is an instrumentation amplifier.
Compared with the prior art, the underground low-power-consumption control circuit and the underground low-power-consumption control method have the same advantages, and are not described again.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
FIG. 1 is a schematic block diagram of a downhole low power consumption control circuit according to an embodiment of the invention;
fig. 2 is a circuit diagram of a signal conditioning circuit according to an embodiment of the present invention;
FIG. 3 is a flow chart of a downhole low power consumption control method according to an embodiment of the invention;
fig. 4 is a frame encoding scheme of a pressure pulse signal generated by a pressure pump according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
A downhole low-power consumption control circuit based on pressure waves is shown in figure 1 and comprises a pressure pump 100, a pressure wave dormancy awakening system 200, a downhole measurement control system 300 and a power management system 400 which are connected in sequence through signals,
the pressure pump 100 is a surface pressure control device for generating a coded pressure pulse signal; the pressure wave dormancy awakening system 200 receives the coded pressure pulse signal sent by the pressure pump 100, processes and decodes the data, and then sends the data to the underground measurement control system 300; the power management system 400 is used to provide the stable dc power required for the pressure wave sleep wake-up system 200 and the downhole measurement control system 300.
The pressure wave dormancy awakening system 200 comprises a pressure sensor 2001, a signal conditioning circuit 2002, a microprocessor 2003 and a storage circuit 2004 which are sequentially connected, wherein the pressure sensor 2001 receives encoded pressure information, the signal conditioning circuit 2002 amplifies an output signal of the pressure sensor 2001, the output signal is sent to the microprocessor 2003 to decode a pressure pulse signal and store the decoded pressure information in the storage circuit 2004, and the microprocessor 2003 outputs the decoded information to the downhole measurement control system 300.
The downhole measurement control system 300 is all electronic modules except for the pressure wave dormancy awakening system in the intelligent drilling tool, is used for measuring and controlling other downhole information, and is connected with the microprocessor 2003 through an I2And C, connecting through a C interface.
The microprocessor of this embodiment uses MSP430 chip series, and the memory circuit uses M25P16 chip series.
As shown in fig. 2, the signal conditioning circuit 2002 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, and a first operational amplifier U1, the first operational amplifier U1 is an instrumentation amplifier, a first end of the first resistor R1 is connected with a first end of the second resistor R2, a second end of the first resistor R1 is connected with a REF reference voltage input pin of the first operational amplifier U1, a second end of the second resistor R2 is connected with a first end of the third resistor R3, a second end of the third resistor R3 is connected with a VOUT output pin of the first operational amplifier U1, a first end of the first capacitor C1 is connected with a + VS power supply positive pin of the first operational amplifier U1, a second end of the first capacitor C1 is connected with a ground terminal, an FB voltage feedback pin of the first operational amplifier U1 is connected with a first end of the third resistor R3, and a BW bandwidth selection pin and a-VS power supply negative pin of the first operational amplifier U1 are both grounded; the + IN signal input pin of the first operational amplifier U1 is connected with the anode of the output voltage of the pressure sensor, and the-IN signal input pin is connected with the cathode of the output voltage of the pressure sensor; the + VS power supply positive pin of the first operational amplifier U1 is connected with the positive electrode of the power management system, and the voltage is 3.3V direct current; the VOUT output pin is connected to the microprocessor 2003 in the pressure wave sleep wake-up system 200.
The first resistor R1 and the second resistor R2 determine the amplification factor of the first operational amplifier U1, and in the schematic diagram of the embodiment of the present invention, the amplification factor is 1+ R2/R1.
In this embodiment, the first operational amplifier U1 is a low power consumption instrumentation amplifier AD 8237.
The collection of the pressure signal at the bottom of the well is the function that most intelligent well drilling tools have, and the pressure signal acquisition circuit simple structure, low power dissipation, if regard pressure wave signal as dormancy of the underground measurement control system, awaken the signal, when not needing to measure, control, only keep the work of pressure measurement, control circuit, the rest of the underground measurement control system 300 enters the dormant state, when measuring, control the demand, awaken other circuit module of the underground measurement control system 300 by the pressure measurement, control circuit, thus can greatly reduce the useless power loss, improve the life-span of the underground work of the intelligent well drilling tool.
The downhole low-power-consumption control method based on the pressure wave for the downhole low-power-consumption control circuit based on the pressure wave is shown in fig. 3, and comprises the following steps:
step 1, generating a coded pressure pulse signal by a ground pressure pump 100;
step 2, acquiring a coded pressure pulse signal through a pressure sensor 2001 in the pressure wave dormancy awakening system 200, amplifying the pressure pulse signal by a signal conditioning circuit 2002, sending the amplified pressure pulse signal into a microprocessor 2003, storing the amplified pressure pulse signal into a storage circuit 2004, and acquiring the pressure signal at a sampling rate of 1 point/s;
step 3, the microprocessor 2003 reads the level of the signal line output by the signal conditioning circuit 2002, and the first rising edge detection of the pressure pulse signal is carried out, because the underground static pressure is related to various factors, the method adopting a given threshold value is not easy to realize, so the signal is determined by adopting an edge detection method, and when the pressure change exceeds 50MPa within any 2min time interval, a signal edge is considered to be received; because the pressure signal is slowly decreased after rapidly increasing to a given pressure value, the rate of pressure increase is uncertain, but typically increases to 5-10MPa in 1 minute, followed by a given value (e.g., 100MPa) in the next 5 seconds;
step 4, if the pressure increase exceeds P Mpa at intervals of t minutes, determining that a first rising edge is detected, and if no rising edge is detected, repeating the step 3;
step 5, after the microprocessor 2003 detects the first rising edge of the pressure pulse signal, reading the current clock and recording the time parameter t1(t1 is the arrival time of the rising edge of the first pulse), and adding 1 to the rising edge counting parameter;
step 6: the microprocessor 2003 continues to read the level of the signal line output by the signal conditioning circuit to detect the rising edge of the pressure pulse signal;
and 7: if the pressure increases over P Mpa at intervals of t minutes, a rising edge is considered to be detected, and if no rising edge is detected, the step 6 is repeated;
and 8: after the microprocessor 2003 detects the rising edge of the pressure pulse signal, reading the current clock and recording a time parameter ti (2 ═ i ═ M) at the moment, wherein ti is the arrival time of the ith rising edge;
step 9, the microprocessor 2003 calculates and stores a time interval Ti (1< ═ i < ═ M-1) between two adjacent rising edges, in the coding scheme adopted by the invention, different time interval lengths correspond to 0 to 15 in the hexadecimal, the purpose of calculating the time interval Ti between two adjacent rising edges is to detect whether the time interval length can correspond to 0 to 15 in the hexadecimal subsequently, and the microprocessor performs decoding operation uniformly according to the data frames at the time interval with successful length matching. For example, the underground measurement control system comprises 8 sub-modules which need to be awakened respectively and can be distinguished by 3-bit binary codes, if the code of the 3 rd sub-module is 011 and corresponds to 3 in hexadecimal, the number 3 corresponds to a certain time interval width.
Step 10: the microprocessor 2003 compares the calculation result with a preset pulse signal sampling interval, judges whether the rising edge interval is valid, and returns to step 6 if the rising edge interval is invalid; if the number is valid, adding 1 to the rising edge counting parameter and recording a rising edge time interval parameter Ti;
step 11, judging whether the number of the collected rising edges is M, wherein M is the length of the coded pressure pulse signal, and turning to step 6 if the number of the collected effective rising edges is less than M;
step 12: after all M rising edges are detected, the microprocessor 2003 decodes the pressure pulse signal;
step 13, the microprocessor 2003 passes the decoded information through I2The C bus is sent into the underground measurement control system 300, and corresponding modules in the underground measurement control system 300 are awakened/dormant;
and 14, starting working or entering a dormant state of a corresponding module of the underground measurement control system, generating a feedback signal and transmitting the feedback signal to the ground, and continuously monitoring signal line level conversion by the microprocessor 2003 to wait for the arrival of the next instruction.
In the embodiment, the rising edge of the pressure pulse in the drilling string is used for signal transmission, the pressure pump 100 generates a coded pressure pulse signal, each frame of signal comprises a synchronization word, a control command and a check bit, the total length is M rising edges, as shown in fig. 4, wherein the interval between the first rising edge and the second rising edge is fixed to be T1 for clock synchronization; the interval between the second rising edge and the third rising edge, the interval between the third rising edge and the fourth rising edge, and the interval between the M-2 nd rising edge and the M-1 th rising edge of … … are control instructions, which are marked as Ti, 2< ═ i < ═ M-2, and are used for determining which functional modules of the downhole measurement control system 300 to be awakened or dormant enter an awakening/dormant state, the lowest bit of the control instructions is a dormant/awakening setting bit, when the lowest bit is 0, the control instructions are set to a dormant state, when the lowest bit is 1, the control instructions are set to an awakening state, the downhole measurement control system 300 starts to work, and the rest bits of the control instructions are submodule selection bits of the downhole measurement control system 300; the interval between the M-1 th rising edge and the Mth rising edge is a check bit, and a parity check mode is adopted. A 16-ary coding scheme is adopted for the interval T:
0 T0
1 T0+1×S
2 T0+2×S
……
15 T0+15×S
wherein, T0Is any fixed value of 2 minutes or more, and S is any fixed value of 2 minutes or more. The low order is before and the high order is after the transmission.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (4)
1. A downhole low-power-consumption control method based on pressure waves is characterized by comprising the following steps:
step 1, generating a coded pressure pulse signal by a ground pressure pump (100);
step 2, collecting coded pressure pulse signals through a pressure sensor (2001), amplifying the pressure pulse signals by a signal conditioning circuit (2002), sending the amplified pressure pulse signals into a microprocessor (2003) and storing the amplified pressure pulse signals into a storage circuit (2004);
step 3, reading the level of the output signal line of the signal conditioning circuit (2002) by the microprocessor (2003) and detecting the first rising edge of the pressure pulse signal;
step 4, if the pressure increase exceeds P Mpa at intervals of t minutes, determining that a first rising edge is detected, and if the first rising edge is not detected, repeating the step 3;
step 5, after the microprocessor (2003) detects the first rising edge of the pressure pulse signal, reading the current clock and recording the time parameter t1 at the moment, and adding 1 to the rising edge counting parameter;
step 6, the microprocessor (2003) continues to read the level of the output signal line of the signal conditioning circuit, and the rising edge detection of the pressure pulse signal is carried out;
step 7, if the pressure increase exceeds P Mpa at intervals of t minutes, determining that a rising edge is detected, and if no rising edge is detected, repeating the step 6;
step 8, after the microprocessor (2003) detects the rising edge of the pressure pulse signal, reading the current clock and recording a time parameter ti at the moment, wherein 2< ═ i < ═ M;
step 9, the microprocessor (2003) calculates a time interval Ti between two adjacent rising edges, wherein 1< ═ i < ═ M-1;
step 10: the microprocessor (2003) compares the calculation result with a preset pulse signal sampling interval, judges whether the rising edge interval is effective or not, and returns to the step 6 if the rising edge interval is ineffective;
if the rising edge interval is effective, adding 1 to the rising edge counting parameter and recording a rising edge time interval parameter Ti to perform step 11;
step 11, judging whether the number of the collected rising edges is M, wherein M is the length of the coded pressure pulse signal, and turning to step 6 if the number of the collected effective rising edges is less than M;
step 12: when all M rising edges are detected, the microprocessor (2003) decodes the pressure pulse signals;
step 13, the microprocessor (2003) passes the decoded information through I2The C bus is sent into the underground measurement control system (300) to wake up/sleep a corresponding module in the underground measurement control system (300);
and 14, starting working or entering a dormant state of a corresponding module of the underground measurement control system, generating a feedback signal and transmitting the feedback signal to the ground, and continuously monitoring signal line level conversion by the microprocessor (2003) to wait for the arrival of the next instruction.
2. The pressure wave-based downhole low-power control method according to claim 1, wherein: each frame of signal of the coded pressure pulse signal comprises a synchronous word, a control instruction and a check bit, the total length is M rising edges, and the interval between the first rising edge and the second rising edge is fixed to be T1 and used for clock synchronization; a second rising edge and a third rising edge interval, a third rising edge and a fourth rising edge interval, and an … … (M-2) th rising edge and an M-1 th rising edge interval are control instructions, and are marked as Ti (2< ═ i < ═ M-2), and are used for determining that a corresponding functional module of the downhole measurement control system (300) to be awakened/dormant enters an awakened/dormant state, the lowest bit of the control instruction is a dormant/awakened setting bit, and the rest bits of the control instruction are selection bits of sub-modules of the downhole measurement control system; the interval between the M-1 th rising edge and the Mth rising edge is a check bit.
3. A pressure wave based downhole low power consumption control circuit applying the pressure wave based downhole low power consumption control method of claim 1 or 2, characterized in that: comprises a pressure pump (100), a pressure wave dormancy awakening system (200), a downhole measurement control system (300) and a power management system (400),
the pressure pump (100) is used for generating a coded pressure pulse signal; the pressure wave dormancy awakening system (200) receives a coded pressure pulse signal sent by the pressure pump, processes and decodes the data, and then sends the data to the underground measurement control system (300); the power management system (400) is used for supplying power to the pressure wave sleep wake-up system (200) and the downhole measurement control system (300);
the pressure wave dormancy awakening system (200) comprises a pressure sensor (2001), a signal conditioning circuit (2002), a microprocessor (2003) and a storage circuit (2004) which are sequentially connected, wherein the pressure sensor (2001) receives encoded pressure information, the signal conditioning circuit (2002) amplifies an output signal of the pressure sensor, the output signal is sent to the microprocessor (2003) to decode a pressure pulse signal and store the decoded pressure information in the storage circuit (2004), and the microprocessor (2003) outputs the decoded information to the downhole measurement control system (300);
the downhole measurement control system (300) is all electronic modules except a pressure wave dormancy awakening system in an intelligent drilling tool, is used for measuring and controlling other downhole information, and is connected with a microprocessor (2003) through an I2And C, connecting through a C interface.
4. A pressure wave based downhole low power consumption control circuit according to claim 3, wherein: the signal conditioning circuit (2002) comprises a first operational amplifier U1 and peripheral circuits thereof, and the first operational amplifier U1 is an instrumentation amplifier.
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| CN105164370A (en) * | 2013-02-25 | 2015-12-16 | 开拓工程股份有限公司 | Integrated downhole system with plural telemetry subsystems |
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| US9689724B2 (en) * | 2012-01-03 | 2017-06-27 | Silicon Laboratories Inc. | Resonant signal sensing circuit having a low power mode |
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| CN201221353Y (en) * | 2008-06-11 | 2009-04-15 | 中国石油集团钻井工程技术研究院 | Downhole wireless electromagnetic transmitting apparatus |
| CN102808612A (en) * | 2011-06-01 | 2012-12-05 | 大庆石油管理局 | Wake-up method of formation pressure testing while drilling |
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