CN105239972A - Multistep pressure coding detonating method and device for well perforation - Google Patents
Multistep pressure coding detonating method and device for well perforation Download PDFInfo
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Abstract
The invention relates to a multistep pressure coding detonating method and device for well perforation. The method comprises the following steps: detecting pressure and temperature signals of a position of well perforation through a pressure sensor and a temperature sensor in real time, comparing the temperature signal with a temperature set by a temperature switch, and starting detonating signal identification after the temperature signal reaches or exceeds the temperature set by the temperature switch; comparing the received pressure signal with a pre-stored and set starting pressure command and completing starting pressure command identification; comparing a subsequently received pressure signal with a pre-stored and set pressure coding command, comparing the received pressure signal with a preset positive coding command and a preset negative coding command, and when a pressure signal detected underground conforms to the set positive coding command, sending a positive acting command to an acting circuit and controlling the acting circuit to output a positive-polarity voltage to detonate a perforating bullet, thereby realizing primary perforating gun detonation; by means of the same principle, negative detonating perforation can be realized.
Description
Technical field
The invention belongs to the automatic control technology of oil field, relate to a kind of multistage pressure for oil well perforation coding method of ignition and device.
Background technology
In oil field, oil as important natural resource, in occupation of very important status in China's socio-economic development process.Since reform and opening-up, along with the fast development of China's economic construction, the dependence of natural resource particularly oil is manifested day by day.China is the country of an oil scarcity, demand over half every year all needs import, and corresponding be, the oil instrument development of China is also in relatively backward level in worldwide, strengthen the development of advanced oil instrument, improving oil recovery efficiency, obtains higher output, is put unusual urgent problems in face of China's oil instrument worker.
In the exploitation of oil, after new oil well is accomplished fluently, need to transfer sleeve pipe, well cementation.Due to the stop of sleeve pipe and cement, the oil in oil reservoir can not flow out automatically.So, usually after well cementation completes, need to carry out perforating job by under perforating gun to predetermined rock stratum.So-called perforation, uses special perforating gun exactly, sleeve pipe and cement sheath is penetrated out, and makes to set up a passage in sleeve pipe and between oil reservoir, guarantees that oil can flow out from oil-producing formation smoothly., a passage for cleanliness without any pollution, for the operations such as follow-up pressure break create good condition, is also the important guarantee making oil well obtain maximum production capacity.
But in perforating job process, perforating bullet is ignited the enormous impact power produced and is often caused the fracture of perforating gun and the destruction of related logging instrument.Moreover, can perforating gun correctly be ignited reliably and often be related to the security of the lives and property of perforating job personnel.The position of perforating job usually more than the thousands of rice in distance ground, instrument is operationally subject to the interference of HTHP and a lot of uncertain factor, exists and misquotes quick-fried possibility.Therefore whether gun perforation process is reasonable, to the safety of oily well yield and exploitation, plays vital effect.
The correct ignition of perforating gun is the important link of in perforating technology.Reliable blasting technology can not only improve the success rate of onepull of going into the well, and use manpower and material resources sparingly cost, especially to the Reliable guarantee of production operation personal security.Along with oilfield exploitation enters the middle and later periods, in order to obtain efficient production capacity, simple single-stage perforation blasting technology can not adapt to the requirement of large-scale production.And carry out multi-stage perforator operation, the reliable ignition of every grade of perforating gun must be ensured, become a heat subject in oil exploitation research.
The perforating gun of domestic and international use and secondary following perforating gun
Current domestic and international existing multistage detonation technology is the working method adopting multiple initiator to match, and igniting method has following several::
Mode 1: caber initiator and pressure detonator combine;
Mode 2: caber initiator and pressure time delay initiator combine;
Mode 3: usual pressure initiator and pressure time delay initiator combine;
Although mode 1 can realize multistage detonation, when oil well is high angle hole, horizontal well, cannot construct, and can not be used for testing the gun perforation process such as connection seat, band pump perforation.
Mode 2 is on the basis based on mode 1, utilizes pressure time delay initiator, avoids gas well, operating risk that high formation pressure brings.The delay initiator of different delayed time time can be adopted according to different well depths.This mode can not be used for the construction of high angle hole, horizontal well equally, also cannot be carried out at the gun perforation process such as test connection seat, band pump perforation.
The detonation mode of mode 3, is almost applicable to all hole conditions, so be the mode using at most, be most widely used, but under delay initiator in well after, because delay time is fixed, the priming network design time cannot be changed; When the multiple time delay condition of needs, the quantity of delay initiator need be increased, add equipment volume, complexity and cost; The monitoring of underground work environment (parameter such as operating pressure, environment temperature) cannot be realized.
In addition, in aforesaid way ignition process, single force value is all adopted to excite enforcement to detonate, due to the polytropy of subsurface environment and pressure detection method too simple, it is inaccurate that build-up of pressure detects, and easy appearance is detonated by mistake, causes engineering accident, construction delay and property loss.
Summary of the invention
The technical problem solved
In order to avoid the deficiencies in the prior art part, the present invention proposes a kind of multistage pressure for oil well perforation coding method of ignition and device, provide the multistage pressure coding acting device and method that a kind of safety is high, controlled, realize remote wireless control to detonate, improve the safety of going into the well in process, and realize once having gone into the well the perforating job of multilayer position.
Technical scheme
For a multistage pressure coding method of ignition for oil well perforation, it is characterized in that step is as follows:
Step 1: temperature pick up and pressure sensor to ambient temperature signal and down-hole pressure signal under production wells in the motion process of down-hole, when collecting temperature magnitude of voltage is greater than Ut, carry out pressure signal identification from aboveground; T is signals collecting interval;
Described Ut is the temperature switch voltage of setting, and setting numerical value is lower than the voltage of the environment temperature of perforation layer position;
Step 2, pressure judge: work as U
i+1– U
i>=U1, and (U
i+n– U
i)>=U1, then starting pressure identification success, carry out step 3; If do not meet above-mentioned condition, be judged as interfering signal, then the pressure data continued the next one collects carries out starting pressure differentiation, constantly repeats this process, until starting pressure identification success, starts pressure measurement, wherein n=2,3 ..., 60;
Wherein: U1 is the voltage value of corresponding 7 MPa, U
ifor T
imoment collects pressure signal voltage, { i ∈ { 0 ,+∞ } };
Step 3, pressure measurement: after starting pressure identification success, the time delay venting duration of 3 minutes, then keep pressure acquisition interval constant, continuous acquisition 60 force value, average as static pressure force value U2 to 60 force value;
Step 4, pressure code identification: keep that pressure acquisition interval is constant proceeds pressure signal collection,
The identification of coded command of just detonating:
Collecting voltage when certain moment is U2+U
i, and continuous 59 magnitudes of voltage collected thereafter are also U2+U
i, judging that detonation mode is as just detonating, completing first command of just detonating and judging;
Described U
i=0.5 volt, for Article 1 is just being detonated coded voltage, I=1,2 ..., 60;
If certain moment collects voltage is thereafter U2+U
j, and continuous 59 magnitudes of voltage collected thereafter are U2+U
j, complete the identification of coded command of just detonating;
Described U
j=1 volt, for Article 2 is just being detonated coded voltage, J=1,2 ..., 60;
Shoulder the identification of quick-fried coded command:
Collecting voltage when certain moment is U2+U
mvolt, and continuous 59 magnitudes of voltage collected thereafter are U2+U
mvolt, judges that detonation mode is as just detonating, and completes and shoulders the judgement of quick-fried first command;
Described U
m=1 volt, for Article 1 shoulders quick-fried coded voltage, M=1,2 ..., 60;
If certain moment collects voltage is thereafter U2+U
nvolt, and continuous 59 magnitudes of voltage collected thereafter are U2+U
nvolt, completes the identification shouldering quick-fried coded command;
Described U
n=0.5 volt, for Article 2 shoulders quick-fried coded voltage, N=1,2 ..., 60;
When the identification of coded command of just detonating completes, four pin current potentials of single-chip microcomputer and on-off circuit KA, KB, KC, KD are respectively: KA, KC are all low level, when KB, KC are high level entirely, OUT1 and anode conducting, OUT2 and GND conducting, realize positive polarity conducting, start the instruction of the perforating bullet that detonates;
When the identification shouldering quick-fried coded command completes, four pin current potentials of single-chip microcomputer and on-off circuit KA, KB, KC, KD are respectively: KA, KC are all high level, when KB, KC are low level entirely, OUT1 and GND conducting, OUT2 and anode conducting, realize negative polarity conducting, start the instruction of the perforating bullet that detonates.
Realize a device for the described multistage pressure for the oil well perforation coding method of ignition, it is characterized in that comprising pressure sensor, temperature pick up, signal conditioning circuit, single-chip microcomputer, power supply circuits, external storage, circuit producing work and communicating circuit; Described circuit producing work comprises U8, U9, U10 and U11 tetra-FETs, four FETs are connected to form bridge type with source electrode and drain electrode and are connected, U8 source electrode and the U10 link that drains is output OUT1, U9 source electrode and the U11 link that drains is output OUT2, and grid KA, KB, KC, KD of four FETs are connected with single-chip processor i/o port respectively; Single-chip microcomputer is connected with host computer by communicating circuit, receives the pressure coded command that host computer sends, and by the pressure coded command received, according in agreement form and address write single-chip microcomputer EEPROM, forms predictive encoding order; Pressure sensor and temperature pick up are placed in Oil/gas Well, pressure signal under the Oil/gas Well gathered and temperature signal transfer in signal conditioning circuit, and signal conditioning circuit carries out filtering respectively to the pressure signal received and temperature signal and is input in single-chip microcomputer after amplifying; Pressure signal and temperature signal and the predictive encoding order be stored in single-chip microcomputer EEPROM compare by single-chip microcomputer, if pressure signal is consistent with predictive encoding order, SCM system to detonate coded command according to plus or minus, control to be connected with circuit producing work KA, KB, KC, KD the current potential of single-chip microcomputer pin, circuit producing work output OUT1, OUT2 export positive or negative polarity voltage, and detonate perforating bullet.
Beneficial effect
A kind of coding method of ignition of the multistage pressure for oil well perforation that the present invention proposes and device, by arranging pressure sensor, temperature pick up and SCM system, pressure sensor and temperature pick up detect the pressure and temperature signal of perforating oil gas well layer position in real time, and the pressure signal collected and temperature signal are sent in SCM system after amplifying, temperature set by the temperature signal received and temperature switch compares by SCM system, after temperature set by degree of meeting or exceeding switch, start time break (starting pressure order, pressure coded command) identify, the pressure signal received and the starting pressure order set that prestores compare by SCM system, when meeting to the predetermined activation pressure order of pressure signal and setting in downhole detection, complete starting pressure command recognition, next, subsequently received pressure signal and the pressure coded command set that prestores compare by SCM system, by the pressure signal received and the positive coded command preset, negative coded command compares, when meeting to the predetermined positive coded command of pressure signal and setting in downhole detection, order of just doing work is sent to circuit producing work, control circuit producing work output cathode voltage, detonate perforating bullet, realize one-level perforating gun to detonate, same principle can realize shouldering quick-fried perforation, use two cover different pressures coded commands to control circuit producing work conducting like this, switch by controlling power positive cathode, coordinate pressure conversion device, realize from bottom to top positive and negatively alternately detonating, complete multi-layer classification perforating job, the high safety realized is controlled detonates.
When detecting that at down-hole control circuit pressure signal is identical with coded command with the predetermined activation pressure order of setting, sending acting order to circuit producing work, controlling circuit producing work and to detonate the reliable initiation of perforating bullet, realization.Meanwhile, pressure blasting adopts starting pressure order and pressure encoded command data, can improve jamproof ability, realize controlled detonating.
Accompanying drawing explanation
Fig. 1: the device of the coding of the multistage pressure for the oil well perforation method of ignition of the present invention
Fig. 2: the circuit producing work schematic diagram in apparatus of the present invention
Detailed description of the invention
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
Accompanying drawing 1 is the theory diagram of the device of the multistage pressure for the oil well perforation of the present invention coding method of ignition, comprises pressure sensor, temperature pick up, signal conditioning circuit, single-chip microcomputer, power supply circuits, external storage, circuit producing work and communicating circuit.Wherein said circuit producing work comprises U8, U9, U10 and U11 tetra-FETs, four FETs are connected to form bridge type with source electrode and drain electrode and are connected, U8 source electrode and the U10 link that drains is output OUT1, U9 source electrode and the U11 link that drains is output OUT2, and grid KA, KB, KC, KD of four FETs are connected with single-chip processor i/o port respectively.
Single-chip microcomputer is connected with host computer by communicating circuit, receives the pressure coded command that host computer sends, and by the pressure coded command received, according in agreement form and address write single-chip microcomputer EEPROM, forms predictive encoding order; Pressure sensor and temperature pick up are placed in Oil/gas Well, pressure signal under the Oil/gas Well gathered and temperature signal transfer in signal conditioning circuit, and signal conditioning circuit carries out filtering respectively to the pressure signal received and temperature signal and is input in single-chip microcomputer after amplifying; Pressure signal and temperature signal and the predictive encoding order be stored in single-chip microcomputer EEPROM compare by single-chip microcomputer, if pressure signal is consistent with predictive encoding order, SCM system to detonate coded command according to plus or minus, control to be connected with circuit producing work KA, KB, KC, KD the current potential of single-chip microcomputer pin, circuit producing work output OUT1, OUT2 export positive or negative polarity voltage, and detonate perforating bullet.
Described pressure sensor, for gathering the pressure signal under Oil/gas Well, and is transferred in signal conditioning circuit by the pressure signal collected;
Described temperature pick up, for gathering the temperature signal under Oil/gas Well, and is transferred in signal conditioning circuit by the temperature signal collected; The method of temperature detection is a lot, has dissimilar sensor available, compares multiple methods such as common are thermocouple, thermistor, radiant type thermometric.When selective temperature sensor, following several factor be considered: temperature measurement range, certainty of measurement, response time, stability, the linearity and sensitivity etc.In addition, considering particular job environment of oil gas downhole instrument and the many restrictions to instrument volume size etc., selecting when selecting the sensor that compact, temperature measurement range are wider, power consumption is lower as far as possible.For reducing volume further, the temperature pick up that the present invention uses should be selected to export the sensor for voltage signal, simplifies the complexity of temperature signal regulation circuit.
Described signal conditioning circuit, for receiving the pressure signal or temperature signal that are input to its inside, and respectively filtering and amplification are carried out to the pressure signal received and temperature signal, and the pressure signal after amplification and temperature signal are input in SCM system;
Described SCM system, for receiving the temperature switch that host computer sends, time break information, by the temperature switch received, time break information, according in agreement form and address write single-chip microcomputer, form the temperature switch preset, time break, and the pressure signal received after signal conditioning circuit amplifies and temperature signal, arrange according to temperature switch and temperature is judged, when temperature value meets or exceeds temperature switch settings, start time break (starting pressure order, pressure coded command) identify, the pressure signal received and the starting pressure order set that prestores compare by SCM system, when meeting to the predetermined activation pressure order of pressure signal and setting in downhole detection, complete starting pressure command recognition, next, subsequently received pressure signal and the pressure coded command set that prestores compare by SCM system, by the pressure signal received and the positive coded command preset, negative coded command compares, when meeting to the predetermined positive coded command of pressure signal and setting in downhole detection, order of just doing work is sent to circuit producing work, control circuit producing work output cathode voltage, detonate perforating bullet, realize one-level perforating gun to detonate, same principle can realize shouldering quick-fried perforation, use two cover different pressures coded commands to control circuit producing work conducting like this, switch by controlling power positive cathode, coordinate pressure conversion device, realize from bottom to top positive and negatively alternately detonating, complete multi-layer classification perforating job,
Before going into the well, priming device needs to be connected by communication module with host computer, and host computer completes the setting of starting pressure order to SCM system in priming device and pressure coded command, the demarcation of pressure sensor and calibrating.The setting of pressure coded command aboveground before priming device is gone into the well is completed by host computer, adopts VC++6.0 programming, coordinates SCM system to complete associative operation; SCM system uses single-chip microcomputer processing pressure sensor to detect the pressure signal obtained, the then order of identification starting pressure and pressure coded command, and the correct voltage exporting corresponding polarity, detonate perforating gun.
The concrete content having following several respects:
The setting of (1) pressure coded command before going into the well.Coordinated by the SCM system in host computer and priming device, form predictive encoding order.Whether predictive encoding order sends the reference coded command of doing work and ordering to perforating bullet, is provide with the form of force value and duration thereof, has been come by ground handling operator.And by the ground applied pressure order of operating personnel according to setting, pressure is applied on the ground in Oil/gas Well, whether single-chip computer control system receives the pressure signal after the pressurization that collects of pressure sensor, and pick out according to this pressure signal and conform to predictive encoding order.
When host computer uses, relevant setting is carried out to pressure coded command waveform, and input penetrates well depth, the signals such as well killing fluid density.Host computer generates the pressure coded command for SCM system identification according to baseband signal and pressure coded command, under pass to SCM system.Will generate pressurization construction documents simultaneously, comprise baseband signal and pressuring curve, the dish that coexists is preserved and is printed.SCM system receives the pressure coded command that host computer is sent here, comprises static pressure and applies pressure, according in agreement form and address write single-chip microcomputer.After starting pressure order and pressure coded command finish receiving, the starting pressure order be written in EEPROM and pressure encoded command data are returned to host computer, so that operating personnel check the correctness of write-enable pressure command and pressure coded command.
Wherein, predetermined activation pressure order and plus or minus coded command comprise following:
One. described pressure command, for being pressurized to P1 MPa, keeps more than t1 minute.
Two. described pressure command, for being pressurized to P2 MPa, keeps more than t2 minute.
Three. described pressure command, for being pressurized to P3 MPa, keeps more than t3 minute.
Four. described pressure command, for being pressurized to P4 MPa, keeps more than t4 minute.
Five. described pressure command, for being pressurized to P5 MPa, keeps more than t5 minute.
Six. described pressure command, for being pressurized to P6 MPa, waits for more than t6 minute.
When the force value that at one end time pressure sensor detects conformed to respectively at these six orders with the duration, after complete, send plus or minus acting order, control circuit producing work and export corresponding polar voltages, detonate the perforating gun that is connected.
(2) demarcation of pressure sensor.In order to overcome the measure error that pressure sensor self-characteristic difference is brought, before product uses, pressure calibration must be carried out to pressure sensor, namely determining the input/output relation of pressure sensor.Due to dispersiveness and the non-linear and temperature drift characteristic of pressure sensor, pressure coding priming device, before use of formally going into the well, needs to carry out pressure calibration and temperature-compensating demarcation to pressure sensor.So-called demarcation will detect the pressure curve and temperature drift curve that obtain pressure sensor exactly, thus obtains detected pressure value accurately.
(3) calibrating of pressure sensor.For guaranteeing the correct demarcation of pressure sensor, ensureing the accuracy of priming device and the reliability service of SCM system, after having demarcated, the result of demarcating being checked, guaranteeing the error criterion that pressure sensor conforms with the regulations.And generate related statements for printing preservation.
Concrete, apply different pressure and temperature values to SCM system, SCM system goes out actual pressure measurements according to nominal data detection computations, and is sent on PC by result, and real-time display measurement value stores logging data simultaneously.According to the corresponding form of detection data genaration, and the actual pressure value being applied to system compares computation and measurement error, and automatically generates check results table for disk preservation and printing according to verification msg.
Meanwhile, because stable operating voltage directly has influence on the normal operation of SCM system modules.The power supply circuits of this device are connected by 2 joint high-temperature batteries and are provided electricity, and magnitude of voltage is about 7 volts, along with the priming device working time increases, also can increase power consumption, the output voltage of battery can corresponding reduction, and in order to ensure system reliability service, during regulation normal work, electric power output voltage is not
Method, is characterized in that step is as follows:
Step 1: temperature pick up and pressure sensor to ambient temperature signal and down-hole pressure signal under production wells in the motion process of down-hole, when collecting temperature magnitude of voltage is greater than Ut, carry out pressure signal identification from aboveground; T is signals collecting interval;
Described Ut is the temperature switch voltage of setting, and setting numerical value is lower than the voltage of the environment temperature of perforation layer position;
Step 2, pressure judge: work as U
i+1– U
i>=U1, and (U
i+n– U
i)>=U1, then starting pressure identification success, carry out step 3; If do not meet above-mentioned condition, be judged as interfering signal, then the pressure data continued the next one collects carries out starting pressure differentiation, constantly repeats this process, until starting pressure identification success, starts pressure measurement, wherein n=2,3 ..., 60;
Wherein: U1 is the voltage value of corresponding 7 MPa, U
ifor T
imoment collects pressure signal voltage, { i ∈ { 0 ,+∞ } };
Step 3, pressure measurement: after starting pressure identification success, the time delay venting duration of 3 minutes, then keep pressure acquisition interval constant, continuous acquisition 60 force value, average as static pressure force value U2 to 60 force value;
Step 4, pressure code identification: keep that pressure acquisition interval is constant proceeds pressure signal collection,
The identification of coded command of just detonating:
Collecting voltage when certain moment is U2+U
i, and continuous 59 magnitudes of voltage collected thereafter are also U2+U
i, judging that detonation mode is as just detonating, completing first command of just detonating and judging;
Described U
i=0.5 volt, for Article 1 is just being detonated coded voltage, I=1,2 ..., 60;
If certain moment collects voltage is thereafter U2+U
j, and continuous 59 magnitudes of voltage collected thereafter are U2+U
j, complete the identification of coded command of just detonating;
Described U
j=1 volt, for Article 2 is just being detonated coded voltage, J=1,2 ..., 60;
Shoulder the identification of quick-fried coded command:
Collecting voltage when certain moment is U2+U
mvolt, and continuous 59 magnitudes of voltage collected thereafter are U2+U
mvolt, judges that detonation mode is as just detonating, and completes and shoulders the judgement of quick-fried first command;
Described U
m=1 volt, for Article 1 shoulders quick-fried coded voltage, M=1,2 ..., 60;
If certain moment collects voltage is thereafter U2+U
nvolt, and continuous 59 magnitudes of voltage collected thereafter are U2+U
nvolt, completes the identification shouldering quick-fried coded command;
Described U
n=0.5 volt, for Article 2 shoulders quick-fried coded voltage, N=1,2 ..., 60;
When the identification of coded command of just detonating completes, four pin current potentials of single-chip microcomputer and on-off circuit KA, KB, KC, KD are respectively: KA, KC are all low level, when KB, KC are high level entirely, OUT1 and anode conducting, OUT2 and GND conducting, realize positive polarity conducting, start the instruction of the perforating bullet that detonates;
When the identification shouldering quick-fried coded command completes, four pin current potentials of single-chip microcomputer and on-off circuit KA, KB, KC, KD are respectively: KA, KC are all high level, when KB, KC are low level entirely, OUT1 and GND conducting, OUT2 and anode conducting, realize negative polarity conducting, start the instruction of the perforating bullet that detonates.
This device employing scm managing system carrys out the perforating bullet predictive encoding order that identification presets, and coded command adopts pressure coded command, to improve antijamming capability.Control in perforating bullet initiation process under being applied in Oil/gas Well, require that SCM system can accurately identify pressure coded command, reliably ignite perforating bullet, ensure construction operation personal security.Interference is random, and the probability that it and the predictive encoding order arranged overlap is almost nil.Priming device carries pressure sensor detected pressures, and when the predictive encoding order of the pressure signal that pressure sensor detects and setting is consistent, detonate perforating bullet.
Claims (3)
1., for a multistage pressure coding method of ignition for oil well perforation, it is characterized in that step is as follows:
Step 1: temperature pick up and pressure sensor to ambient temperature signal and down-hole pressure signal under production wells in the motion process of down-hole, when collecting temperature magnitude of voltage is greater than Ut, carry out pressure signal identification from aboveground; T is signals collecting interval;
Described Ut is the temperature switch voltage of setting, and setting numerical value is lower than the voltage of the environment temperature of perforation layer position;
Step 2, pressure judge: work as U
i+1– U
i>=U1, and (U
i+n– U
i)>=U1, then starting pressure identification success, carry out step 3; If do not meet above-mentioned condition, be judged as interfering signal, then the pressure data continued the next one collects carries out starting pressure differentiation, constantly repeats this process, until starting pressure identification success, starts pressure measurement, wherein n=2,3 ..., 60;
Wherein: U1 is the voltage value of corresponding 7 MPa, U
ifor T
imoment collects pressure signal voltage, { i ∈ { 0 ,+∞ } };
Step 3, pressure measurement: after starting pressure identification success, the time delay venting duration of 3 minutes, then keep pressure acquisition interval constant, continuous acquisition 60 force value, average as static pressure force value U2 to 60 force value;
Step 4, pressure code identification: keep that pressure acquisition interval is constant proceeds pressure signal collection,
The identification of coded command of just detonating:
Collecting voltage when certain moment is U2+U
i, and continuous 59 magnitudes of voltage collected thereafter are also U2+U
i, judging that detonation mode is as just detonating, completing first command of just detonating and judging;
Described U
i=0.5 volt, for Article 1 is just being detonated coded voltage, I=1,2 ..., 60;
If certain moment collects voltage is thereafter U2+U
j, and continuous 59 magnitudes of voltage collected thereafter are U2+U
j, complete the identification of coded command of just detonating;
Described U
j=1 volt, for Article 2 is just being detonated coded voltage, J=1,2 ..., 60;
Shoulder the identification of quick-fried coded command:
Collecting voltage when certain moment is U2+U
mvolt, and continuous 59 magnitudes of voltage collected thereafter are U2+U
mvolt, judges that detonation mode is as just detonating, and completes and shoulders the judgement of quick-fried first command;
Described U
m=1 volt, for Article 1 shoulders quick-fried coded voltage, M=1,2 ..., 60;
If certain moment collects voltage is thereafter U2+U
nvolt, and continuous 59 magnitudes of voltage collected thereafter are U2+U
nvolt, completes the identification shouldering quick-fried coded command;
Described U
n=0.5 volt, for Article 2 shoulders quick-fried coded voltage, N=1,2 ..., 60;
When the identification of coded command of just detonating completes, four pin current potentials of single-chip microcomputer and on-off circuit KA, KB, KC, KD are respectively: KA, KC are all low level, when KB, KC are high level entirely, OUT1 and anode conducting, OUT2 and GND conducting, realize positive polarity conducting, start the instruction of the perforating bullet that detonates;
When the identification shouldering quick-fried coded command completes, four pin current potentials of single-chip microcomputer and on-off circuit KA, KB, KC, KD are respectively: KA, KC are all high level, when KB, KC are low level entirely, OUT1 and GND conducting, OUT2 and anode conducting, realize negative polarity conducting, start the instruction of the perforating bullet that detonates.
2. realize a device for the multistage pressure for the oil well perforation according to claim 1 coding method of ignition, it is characterized in that comprising pressure sensor, temperature pick up, signal conditioning circuit, single-chip microcomputer, power supply circuits, external storage, circuit producing work and communicating circuit; Described circuit producing work comprises U8, U9, U10 and U11 tetra-FETs, four FETs are connected to form bridge type with source electrode and drain electrode and are connected, U8 source electrode and the U10 link that drains is output OUT1, U9 source electrode and the U11 link that drains is output OUT2, and grid KA, KB, KC, KD of four FETs are connected with single-chip processor i/o port respectively; Single-chip microcomputer is connected with host computer by communicating circuit, receives the pressure coded command that host computer sends, and by the pressure coded command received, according in agreement form and address write single-chip microcomputer EEPROM, forms predictive encoding order; Pressure sensor and temperature pick up are placed in Oil/gas Well, pressure signal under the Oil/gas Well gathered and temperature signal transfer in signal conditioning circuit, and signal conditioning circuit carries out filtering respectively to the pressure signal received and temperature signal and is input in single-chip microcomputer after amplifying; Pressure signal and temperature signal and the predictive encoding order be stored in single-chip microcomputer EEPROM compare by single-chip microcomputer, if pressure signal is consistent with predictive encoding order, SCM system to detonate coded command according to plus or minus, control to be connected with circuit producing work KA, KB, KC, KD the current potential of single-chip microcomputer pin, circuit producing work output OUT1, OUT2 export positive or negative polarity voltage, and detonate perforating bullet.
3. device according to claim 1, is characterized in that: described temperature pick up adopts thermocouple, thermistor or radiation temperature sensor.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106568505A (en) * | 2016-11-03 | 2017-04-19 | 上海交通大学 | Arc spectrum synchronous real-time scanning linear multichannel acquisition device |
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