CN105239972B - A kind of multistage pressure for oil well perforation encodes the method for ignition and device - Google Patents
A kind of multistage pressure for oil well perforation encodes the method for ignition and device Download PDFInfo
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Abstract
The present invention relates to a kind of multistage pressure for oil well perforation to encode the method for ignition and device, detect the pressure and temperature signal of perforating oil gas well layer position in real time by pressure sensor and temperature sensor, by temperature signal compared with temperature set by temperature switch, after temperature set by degree of meeting or exceeding switch, start time break identification；By the pressure signal received compared with the startup pressure command for the setting that prestores, complete to start pressure command identification；By subsequently received pressure signal compared with the pressure coded command for the setting that prestores, by the pressure signal received compared with positive coded command set in advance, negative coded command, when meeting in downhole detection to pressure signal and the predetermined positive coded command set, positive acting order is sent to circuit producing work, control circuit producing work output cathode voltage, detonate perforating bullet, realizes that one-level perforating gun detonates, same principle, which can be realized, shoulders quick-fried perforation.
Description
Technical field
The invention belongs to the automatic control technology of oil field, is related to a kind of multistage pressure for oil well perforation and encodes
Quick-fried method and device.
Background technology
It is sufficient in occupation of lifting during China's socio-economic development as important natural resources in oil field, oil
The status of weight.Since reform and opening-up, with the fast development of economic construction of China, the dependence to natural resources particularly oil
Increasingly show.China is the deficient country of an oil, and the annual demand of more than half is required for import, and corresponding
It is that the oil instrument development in China is also at relatively backward level in worldwide, increases grinding for advanced oil instrument
System, oil recovery efficiency is improved, obtain higher yield, be pendulum unusual urgent problems in face of China's oil instrument worker.
In the exploitation of oil, it is necessary to transfer sleeve pipe, well cementation after new oil well is accomplished fluently.Due to the resistance of sleeve pipe and cement
Keep off, the oil in oil reservoir will not flow out automatically.So, it is necessary to which predetermined rock stratum will be arrived under perforating gun generally after the completion of well cementation
Carry out perforating job.So-called perforation, it is exactly using special perforating gun, sleeve pipe and cement sheath is penetrated out, makes in sleeve pipe and oily
A passage is set up between layer, it is ensured that oil smoothly can flow out from oil-producing formation.The passage of one cleanliness without any pollution, it is follow-up
The operations such as pressure break create good condition, and the important guarantee for making oil well obtain maximum production capacity.
But during perforating job, enormous impact force caused by perforating bullet ignition often results in fracture and the phase of perforating gun
Close the destruction of logger.Moreover, can perforating gun correctly reliably ignite the life for being often related to perforating job personnel
Order property safety.Perforating job generally position of more than thousands of meters away from ground, instrument at work by HTHP and
The interference of many uncertain factors, exists and misquotes quick-fried possibility.Therefore whether gun perforation process is reasonable, to oily well yield and exploitation
Safety, play vital effect.
The correct ignition of perforating gun is an important link in perforating technology.Reliable blasting technology can not only carry
Height is gone into the well the success rate of onepull, and use manpower and material resources sparingly cost, even more the Reliable guarantee to production operation personal security.With
Oilfield exploitation enters the middle and later periods, and in order to obtain efficient production capacity, simple single-stage perforation blasting technology does not adapt to
The requirement of large-scale production.And multi-stage perforator operation is carried out, the reliable ignition of every grade of perforating gun must be ensured, turn into oil exploitation and grind
A heat subject in studying carefully.
The perforating gun that uses both at home and abroad and secondary following perforating gun
Existing multistage detonation technology is the working method being engaged using a variety of initiators both at home and abroad at present, igniting method
Have 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, can not be constructed,
And it cannot be used for the gun perforation process such as test connection seat, band pump perforation.
Mode 2 is based on the basis of mode 1, using pressure time delay initiator, avoids gas well, high formation pressure is brought
Operating risk.The delay initiator of different delayed time time can be used according to different well depths.This mode can not equally be used
In the construction of high angle hole, horizontal well, the gun perforation process such as test connection seat, band pump perforation can not be also carried out at.
The detonation mode of mode 3, all hole conditions are suitable for almost, so be to use mode that is most, being most widely used,
But under delay initiator into well after, because delay time is fixed, the priming network design time can not be changed；When the multiple delay bars of needs
During part, the quantity of delay initiator need to be increased, add equipment volume, complexity and cost；Underground work environment can not be realized
The monitoring of (parameter such as operating pressure, environment temperature).
In addition, in aforesaid way ignition process, all implementation is excited to detonate using single pressure value, it is more due to subsurface environment
Denaturation and pressure detection method are excessively simple, the inaccuracy of build-up of pressure detection, easily occur detonating by mistake, cause engineering accident, work
Phase is delayed and property loss.
The content of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes that a kind of multistage pressure for oil well perforation encodes
Quick-fried method and device, there is provided a kind of safe, controllable multistage pressure coding acting device and method, realize long distance wireless
Control detonation, the security during going into the well is improved, and realize once to go into the well and complete multilayer position perforating job.
Technical scheme
A kind of multistage pressure for oil well perforation encodes the method for ignition, it is characterised in that step is as follows：
Step 1：Down-hole ambient temperature letter is gathered on temperature sensor and pressure sensor artesian well into underground motion process
Number and down-hole pressure signal, when collecting temperature magnitude of voltage is more than Ut, progress pressure signal identification；T is signal acquisition interval；
The Ut is the temperature switch voltage of setting, and setting numerical value is less than the voltage of the environment temperature of perforation layer position；
Step 2, pressure judge：Work as Ui+1–Ui>=U1, and (Ui+n–Ui) >=U1, then start Pressure identification success, carry out step
3；If being unsatisfactory for above-mentioned condition, it is judged as interference signal, then continues to carry out startup pressure to next pressure data collected
Differentiate, constantly repeat this process, beginning pressure measurement successful until starting Pressure identification, wherein n=2,3 ..., 60；
Wherein：U1 is the voltage value of corresponding 7 MPas, UiFor TiMoment collects pressure signal voltage, i ∈ 0 ,+
∞}}；
Step 3, pressure measurement：After Pressure identification success is started, the venting duration of delay 3 minutes, pressure is then kept
Power acquisition interval is constant, 60 pressure values of continuous acquisition, 60 pressure values is averaged for static pressure force value U2；
Step 4, pressure code identification：Keep pressure acquisition interval is constant to continue pressure signal collection,
The identification of positive detonation coded command：
It is U2+U to collect voltage when certain momentI, and continuous 59 magnitudes of voltage collected thereafter are also U2+UI, judge
Quick-fried mode is positive detonation, completes positive detonation first command and judges；
The UI=0.5 volt, be first positive detonation coded voltage, I=1,2 ..., 60；
It is U2+U that if certain moment, which collects voltage, thereafterJ, and continuous 59 magnitudes of voltage collected thereafter are U2+UJ, complete
The identification of positive detonation coded command；
The UJ=1 volt, just detonated coded voltage for Article 2, J=1,2 ..., 60；
Shoulder the identification of quick-fried coded command：
It is U2+U to collect voltage when certain momentMVolt, and continuous 59 magnitudes of voltage collected thereafter are U2+UMVolt, judge
Detonation mode is positive detonation, and completion is shouldered quick-fried first command and judged；
The UM=1 volt, quick-fried coded voltage is shouldered for first, M=1,2 ..., 60；
It is U2+U that if certain moment, which collects voltage, thereafterNVolt, and continuous 59 magnitudes of voltage collected thereafter are U2+UNVolt,
The identification of quick-fried coded command is shouldered in completion；
The UN=0.5 volt, quick-fried coded voltage is shouldered for Article 2, N=1,2 ..., 60；
When the identification of just detonation coded command is completed, four pin electricity of single-chip microcomputer and on-off circuit KA, KB, KC, KD
Position is respectively：KA, KC are all low level, and when KB, KC are all high level, OUT1 turns on anode, OUT2 and GND
Conducting, realize that positive polarity turns on, start the instruction of detonation perforating bullet；
When the identification completion for shouldering quick-fried coded command, four pin current potentials of single-chip microcomputer and on-off circuit KA, KB, KC, KD
Respectively：KA, KC are all high level, and when KB, KC are all low level, OUT1 is turned on GND, and OUT2 is led with anode
It is logical, realize that negative polarity turns on, start the instruction of detonation perforating bullet.
It is a kind of realize described in be used for oil well perforation multistage pressure coding the method for ignition device, it is characterised in that including pressure
Force snesor, temperature sensor, signal conditioning circuit, single-chip microcomputer, power supply circuit, external storage, circuit producing work and communication electricity
Road；Described circuit producing work includes tetra- FETs of U8, U9, U10 and U11, and four FETs are connected with source electrode with drain electrode
Bridge type connection is formed, U8 source electrodes are output end OUT1, U9 source electrode with U10 drain electrodes connection end and U11 drain electrodes connection end is output end
OUT2, grid KA, KB, KC, KD of four FETs are connected with single-chip processor i/o port respectively；Single-chip microcomputer passes through communicating circuit
It is connected with host computer, receives the pressure coded command that host computer is sent, the pressure coded command that will be received, according to agreement form
And in the write-in single-chip microcomputer EEPROM of address, form predictive encoding order；Pressure sensor and temperature sensor are placed in Oil/gas Well,
Pressure signal and temperature signal under the Oil/gas Well of collection transmitted into signal conditioning circuit, and signal conditioning circuit is to receiving
Pressure signal and temperature signal are input in single-chip microcomputer after being filtered and amplify respectively；Single-chip microcomputer believes pressure signal and temperature
Number compared with the predictive encoding order being stored in single-chip microcomputer EEPROM, if pressure signal is consistent with predictive encoding order
Close, SCM system controls the single-chip microcomputer pin that is connected with circuit producing work KA, KB, KC, KD according to positive or negative detonation coded command
Current potential, circuit producing work output end OUT1, OUT2 output positive or negative polarity voltage, detonate perforating bullet.
Beneficial effect
A kind of multistage pressure for oil well perforation proposed by the present invention encodes the method for ignition and device, by setting pressure
Sensor, temperature sensor and SCM system, pressure sensor and temperature sensor detect perforating oil gas well layer position in real time
Pressure and temperature signal, and be sent to the pressure signal collected and temperature signal are amplified in SCM system, it is single
Piece machine system by the temperature signal received compared with temperature set by temperature switch, degree of meeting or exceeding switch set by
After temperature, start time break (starting pressure command, pressure coded command) identification, SCM system believes the pressure received
Number compared with the startup pressure command for the setting that prestores, when in downhole detection to pressure signal and the predetermined activation pressure set
Order is completed to start pressure command identification when meeting, next, SCM system by subsequently received pressure signal with prestoring
The pressure coded command of setting is compared, by the pressure signal received and positive coded command set in advance, negative coding life
Order is compared, and when meeting in downhole detection to pressure signal and the predetermined positive coded command set, is sent to circuit producing work
Positive acting order, controls circuit producing work output cathode voltage, and detonate perforating bullet, realizes that one-level perforating gun detonates, same principle
It can be achieved to shoulder quick-fried perforation, control circuit producing work to turn on using two sets of different pressures coded commands like this, by controlling power supply
Positive-negative polarity switches, and coordinates pressure conversion device, realizes from bottom to top positive and negative alternately detonation, completes multi-layer classification perforating job,
The controllable detonation of high safety of realization.
When underground control circuit detect pressure signal and set predetermined activation pressure order it is identical with coded command
When, send acting order, control circuit producing work detonation perforating bullet, the reliable initiation of realization to circuit producing work.Meanwhile pressure blasting
Using pressure command and pressure encoded command data is started, jamproof ability can be improved, realizes controllable detonation.
Brief description of the drawings
Fig. 1：The multistage pressure for oil well perforation of the present invention encodes the device of the method for ignition
Fig. 2：Circuit producing work schematic diagram in apparatus of the present invention
Embodiment
In conjunction with embodiment, accompanying drawing, the invention will be further described：
Accompanying drawing 1 encodes the theory diagram of the device of the method for ignition, bag for the multistage pressure for oil well perforation of the present invention
Include pressure sensor, temperature sensor, signal conditioning circuit, single-chip microcomputer, power supply circuit, external storage, circuit producing work and lead to
Interrogate circuit.Wherein described circuit producing work includes tetra- FETs of U8, U9, U10 and U11, and four FETs are with source electrode and leakage
Pole is connected to form bridge type connection, and U8 source electrodes are that output end OUT1, U9 source electrode is with U11 drain electrodes connection end with U10 drain electrodes connection end
Output end OUT2, grid KA, KB, KC, KD of four FETs are connected with single-chip processor i/o port respectively.
Single-chip microcomputer is connected by communicating circuit with host computer, is received the pressure coded command that host computer is sent, will be received
Pressure coded command, write according to agreement form and address in single-chip microcomputer EEPROM, form predictive encoding order；Pressure sensing
Device and temperature sensor are placed in Oil/gas Well, and the pressure signal and temperature signal under the Oil/gas Well of collection are transmitted to signal condition electricity
Lu Zhong, signal conditioning circuit are input to single-chip microcomputer after the pressure signal and temperature signal that receive are filtered and amplified respectively
In；Single-chip microcomputer by pressure signal and temperature signal compared with the predictive encoding order being stored in single-chip microcomputer EEPROM, if
Pressure signal is consistent with predictive encoding order, and SCM system is according to positive or negative detonation coded command, control and circuit producing work
The current potential of the connected single-chip microcomputer pin of KA, KB, KC, KD, circuit producing work output end OUT1, OUT2 output positive or negative polarity voltage, rises
Quick-fried perforating bullet.
Described pressure sensor, transmitted for gathering the pressure signal under Oil/gas Well, and by the pressure signal collected
Into signal conditioning circuit；
Described temperature sensor, transmitted for gathering the temperature signal under Oil/gas Well, and by the temperature signal collected
Into signal conditioning circuit；The method of temperature detection is a lot, has different types of sensor available, relatively common has heat
A variety of methods such as galvanic couple, thermistor, radiant type thermometric.When selecting temperature sensor, following several factors are considered：
Temperature measurement range, measurement accuracy, response time, stability, the linearity and sensitivity etc..In addition, it is contemplated that Oil/gas Well
Particular job environment of lower instrument and many restrictions to equipment instrument size etc., small volume is selected as far as possible in selection
Ingeniously, the sensor that temperature measurement range is wider, power consumption is relatively low.Further to reduce volume, the temperature sensor that the present invention uses
Sensor of the output for voltage signal should be selected, to simplify the complexity of temperature signal regulation circuit.
Described signal conditioning circuit, its internal pressure signal or temperature signal is input to for receiving, and docked
The pressure signal and temperature signal received is filtered and amplified respectively, and the pressure signal after amplification and temperature signal are inputted
Into SCM system；
Described SCM system, for receiving temperature switch, the time break information of host computer transmission, by what is received
Temperature switch, time break information, according in agreement form and address write-in single-chip microcomputer, form default temperature switch, detonation
Signal, and pressure signal and temperature signal after signal conditioning circuit amplifies are received, set to enter temperature according to temperature switch
Row judges, when temperature value meets or exceeds temperature switch arranges value, starts time break and (starts pressure command, pressure coding
Order) identification, SCM system by the pressure signal received compared with the startup pressure command for the setting that prestores, when in well
Under detect pressure signal and the predetermined activation pressure order set when meeting, complete to start pressure command identification, next, single
Piece machine system by subsequently received pressure signal compared with the pressure coded command for the setting that prestores, the pressure that will receive
Signal is compared with positive coded command set in advance, negative coded command, when in downhole detection to pressure signal and setting
When predetermined positive coded command meets, positive acting order is sent to circuit producing work, circuit producing work output cathode voltage is controlled, detonates
Perforating bullet, realize that one-level perforating gun detonates, same principle, which can be realized, shoulders quick-fried perforation, is encoded like this using two sets of different pressures
Order control circuit producing work conducting, by controlling power positive cathode to switch, coordinates pressure conversion device, realizes from bottom to top just
It is negative alternately to detonate, multi-layer classification perforating job is completed,
Before going into the well, priming device is needed by communication module to be connected with host computer, and host computer is completed to priming device
The startup pressure command of middle SCM system and the setting of pressure coded command, the demarcation and calibrating of pressure sensor.Detonating
The setting of pressure coded command before device is gone into the well on well is completed by host computer, is programmed using VC++6.0, coordinates single-chip microcomputer system
System completes associative operation；The pressure signal that SCM system detects to obtain using single-chip microcomputer processing pressure sensor, is then recognized
Start pressure command and pressure coded command, the voltage of the correct corresponding polarity of output, detonate perforating gun.
Specifically there is the content of following several respects：
The setting of (1) pressure coded command before going into the well.With the SCM system in host computer and priming device,
Form predictive encoding order.Predictive encoding order is whether to send the reference coded command of acting order to perforating bullet, is to press
What force value and its form of duration provided, completed by ground handling operator.And the ground by operating personnel according to setting
The pressure command of application, applies pressure into Oil/gas Well on the ground, and single-chip computer control system receives pressure sensor and collected
Pressurization after pressure signal, and picked out and whether be consistent with predictive encoding order according to the pressure signal.
Related setting is carried out when host computer uses to pressure coded command waveform, and inputs and penetrates well depth, well killing fluid density
Deng signal.The pressure coded command that host computer recognizes according to baseband signal and the generation of pressure coded command for SCM system, under
It is transmitted to SCM system.Pressurization construction documents, including baseband signal and pressuring curve are generated simultaneously, disk coexists and preserves and beats
Print.SCM system receives the pressure coded command that host computer is sent, including static pressure and application pressure, according to agreement form and ground
In location write-in single-chip microcomputer.Start the startup pressure after pressure command and pressure coded command finish receiving, being written in EEPROM
Power order returns to host computer with pressure encoded command data, so that operating personnel check that write-in starts pressure command and compiled with pressure
The correctness of code order.
Wherein, predetermined activation pressure order includes following with positive or negative coded command：
It is more than minute to keep t1 to be pressurized to P1 MPas for pressure command described in one,.
It is more than minute to keep t2 to be pressurized to P2 MPas for pressure command described in two,.
It is more than minute to keep t3 to be pressurized to P3 MPas for pressure command described in three,.
It is more than minute to keep t4 to be pressurized to P4 MPas for pressure command described in four,.
It is more than minute to keep t5 to be pressurized to P5 MPas for pressure command described in five,.
It is more than minute to wait t6 to be pressurized to P6 MPas for pressure command described in six,.
When the pressure value that time pressure sensor detects at one end is consistent with the duration respectively at this six orders,
After the completion of execution, positive or negative order of doing work is sent, the corresponding polar voltages of control circuit producing work output, detonate the perforating gun that is connected.
(2) demarcation of pressure sensor.For the measurement error for overcoming pressure sensor self-characteristic different and bringing,
Product is before use, the input/output relation of pressure calibration, i.e. determination pressure sensor must be carried out to pressure sensor.Due to pressure
The dispersed and non-linear and temperature drift characteristic of force snesor, pressure encode priming device and gone into the well formal before use, needing
Pressure calibration is carried out to pressure sensor and temperature-compensating is demarcated.So-called demarcation seeks to detection and obtains the pressure of pressure sensor
Force curve and temperature drift curve, so as to obtain accurate detected pressure value.
(3) calibrating of pressure sensor.To ensure the correct demarcation of pressure sensor, ensure priming device accuracy and
The reliability service of SCM system, the result of demarcation is checked after the completion of demarcation, it is ensured that pressure sensor meets regulation
Error criterion.And generate related statements and preserved for printing.
Specifically, applying different pressure and temperature values to SCM system, SCM system detects according to nominal data
Actual pressure measurements are calculated, and result is sent on PC, real-time display measured value stores logging data simultaneously.According to
Detect data and generate corresponding form, and be applied to the actual pressure value of system and compare calculating measurement error, and according to checking number
Preserve and print for disk according to check results table is automatically generated.
Simultaneously as stable operating voltage directly influences the normal operation of SCM system modules.The present apparatus
Power supply circuit be provided in series electricity by 2 section high-temperature batteries, magnitude of voltage is 7 volts or so, as the priming device working time increases,
Power consumption can also be increased, the output voltage of battery can be reduced accordingly, in order to ensure system reliability service, it is specified that normal work
When electric power output voltage not
Method, it is characterised in that step is as follows：
Step 1：Down-hole ambient temperature letter is gathered on temperature sensor and pressure sensor artesian well into underground motion process
Number and down-hole pressure signal, when collecting temperature magnitude of voltage is more than Ut, progress pressure signal identification；T is signal acquisition interval；
The Ut is the temperature switch voltage of setting, and setting numerical value is less than the voltage of the environment temperature of perforation layer position；
Step 2, pressure judge：Work as Ui+1–Ui>=U1, and (Ui+n–Ui) >=U1, then start Pressure identification success, carry out step
3；If being unsatisfactory for above-mentioned condition, it is judged as interference signal, then continues to carry out startup pressure to next pressure data collected
Differentiate, constantly repeat this process, beginning pressure measurement successful until starting Pressure identification, wherein n=2,3 ..., 60；
Wherein：U1 is the voltage value of corresponding 7 MPas, UiFor TiMoment collects pressure signal voltage, i ∈ 0 ,+
∞}}；
Step 3, pressure measurement：After Pressure identification success is started, the venting duration of delay 3 minutes, pressure is then kept
Power acquisition interval is constant, 60 pressure values of continuous acquisition, 60 pressure values is averaged for static pressure force value U2；
Step 4, pressure code identification：Keep pressure acquisition interval is constant to continue pressure signal collection,
The identification of positive detonation coded command：
It is U2+U to collect voltage when certain momentI, and continuous 59 magnitudes of voltage collected thereafter are also U2+UI, judge
Quick-fried mode is positive detonation, completes positive detonation first command and judges；
The UI=0.5 volt, be first positive detonation coded voltage, I=1,2 ..., 60；
It is U2+U that if certain moment, which collects voltage, thereafterJ, and continuous 59 magnitudes of voltage collected thereafter are U2+UJ, complete
The identification of positive detonation coded command；
The UJ=1 volt, just detonated coded voltage for Article 2, J=1,2 ..., 60；
Shoulder the identification of quick-fried coded command：
It is U2+U to collect voltage when certain momentMVolt, and continuous 59 magnitudes of voltage collected thereafter are U2+UMVolt, judge
Detonation mode is positive detonation, and completion is shouldered quick-fried first command and judged；
The UM=1 volt, quick-fried coded voltage is shouldered for first, M=1,2 ..., 60；
It is U2+U that if certain moment, which collects voltage, thereafterNVolt, and continuous 59 magnitudes of voltage collected thereafter are U2+UNVolt,
The identification of quick-fried coded command is shouldered in completion；
The UN=0.5 volt, quick-fried coded voltage is shouldered for Article 2, N=1,2 ..., 60；
When the identification of just detonation coded command is completed, four pin electricity of single-chip microcomputer and on-off circuit KA, KB, KC, KD
Position is respectively：KA, KC are all low level, and when KB, KC are all high level, OUT1 turns on anode, OUT2 and GND
Conducting, realize that positive polarity turns on, start the instruction of detonation perforating bullet；
When the identification completion for shouldering quick-fried coded command, four pin current potentials of single-chip microcomputer and on-off circuit KA, KB, KC, KD
Respectively：KA, KC are all high level, and when KB, KC are all low level, OUT1 is turned on GND, and OUT2 is led with anode
It is logical, realize that negative polarity turns on, start the instruction of detonation perforating bullet.
The present apparatus recognizes perforating bullet predictive encoding order set in advance using scm managing system, and coded command is adopted
With pressure coded command, to improve antijamming capability.Apply and controlled under Oil/gas Well in perforating bullet initiation process, it is desirable to single-chip microcomputer
System can accurately identify pressure coded command, reliably ignite perforating bullet, ensure construction worker's safety.Interference is random
, the probability that it is overlapped with the predictive encoding order set is almost nil.Priming device carries pressure sensor detection pressure, when
When the pressure signal and the predictive encoding order of setting that pressure sensor detects are consistent, detonate perforating bullet.
Claims (2)
1. a kind of multistage pressure for oil well perforation encodes the method for ignition, it is characterised in that step is as follows：
In step 1, temperature sensor and pressure sensor artesian well into underground motion process under production wells ambient temperature signal and
Down-hole pressure signal, when collecting temperature magnitude of voltage is more than Ut, carry out pressure signal identification；T is signal acquisition interval；
The Ut is the temperature switch voltage of setting, and setting numerical value is less than the voltage of the environment temperature of perforation layer position；
Step 2, pressure judge：Work as Ui+1–Ui>=U1, and (Ui+n–Ui) >=U1, then start Pressure identification success, carry out step 3；If
Above-mentioned condition is unsatisfactory for, is judged as interference signal, then continues that next pressure data collected is carried out to start pressure differentiation,
This process is constantly repeated, beginning pressure measurement successful until starting Pressure identification, wherein n=2,3 ..., 60；
Wherein：U1 is the voltage value of corresponding 7 MPas, UiFor TiMoment collects pressure signal voltage, i ∈ 0 ,+
∞}}；
Step 3, pressure measurement：After Pressure identification success is started, the venting duration of delay 3 minutes, then pressure is kept to adopt
Collection interval is constant, 60 pressure values of continuous acquisition, 60 pressure values is averaged for static pressure force value U2；
Step 4, pressure code identification：Keep pressure acquisition interval is constant to continue pressure signal collection,
The identification of positive detonation coded command：
It is U2+U to collect voltage when certain momentI, and continuous 59 magnitudes of voltage collected thereafter are also U2+UI, judge detonation side
Formula is positive detonation, completes positive detonation first command and judges；
The UI=0.5 volt, be first positive detonation coded voltage, I=1,2 ..., 60；
It is U2+U that if certain moment, which collects voltage, thereafterJ, and continuous 59 magnitudes of voltage collected thereafter are U2+UJ, complete just to rise
The identification of quick-fried coded command；
The UJ=1 volt, just detonated coded voltage for Article 2, J=1,2 ..., 60；
Shoulder the identification of quick-fried coded command：
It is U2+U to collect voltage when certain momentMVolt, and continuous 59 magnitudes of voltage collected thereafter are U2+UMVolt, judges to detonate
Mode is positive detonation, and completion is shouldered quick-fried first command and judged；
The UM=1 volt, quick-fried coded voltage is shouldered for first, M=1,2 ..., 60；
It is U2+U that if certain moment, which collects voltage, thereafterNVolt, and continuous 59 magnitudes of voltage collected thereafter are U2+UNVolt, complete
Shoulder the identification of quick-fried coded command；
The UN=0.5 volt, quick-fried coded voltage is shouldered for Article 2, N=1,2 ..., 60；
When the identification of just detonation coded command is completed, four pin current potentials point of single-chip microcomputer and on-off circuit KA, KB, KC, KD
It is not：KA, KC are all low level, and when KB, KC are all high level, OUT1 turns on anode, and OUT2 turns on GND,
Realize that positive polarity turns on, start the instruction of detonation perforating bullet；
When the identification for shouldering quick-fried coded command is completed, four pin current potentials of single-chip microcomputer and on-off circuit KA, KB, KC, KD are distinguished
For：KA, KC are all high level, and when KB, KC are all low level, OUT1 turns on GND, and OUT2 turns on anode, real
Existing negative polarity conducting, starts the instruction of detonation perforating bullet.
2. a kind of a kind of multistage pressure for oil well perforation as claimed in claim 1 encodes the method for ignition, it is characterised in that
Including a kind of device, the device includes pressure sensor, temperature sensor, signal conditioning circuit, single-chip microcomputer, power supply circuit, outer
Portion's holder, circuit producing work and communicating circuit；Described circuit producing work includes tetra- FETs of U8, U9, U10 and U11, four
FET is connected to form bridge type with drain electrode with source electrode and is connected, and U8 source electrodes are output end OUT1, U9 source electrode with U10 drain electrodes connection end
Be output end OUT2 with U11 drain electrodes connection end, grid KA, KB, KC, KD of four FETs respectively with single-chip processor i/o port
Connection；Single-chip microcomputer is connected by communicating circuit with host computer, receives the pressure coded command that host computer is sent, the pressure that will be received
Power coded command, write according to agreement form and address in single-chip microcomputer EEPROM, form predictive encoding order；Pressure sensor and
Temperature sensor is placed in Oil/gas Well, and the pressure signal and temperature signal under the Oil/gas Well of collection are transmitted to signal conditioning circuit
In, signal conditioning circuit is input to single-chip microcomputer after the pressure signal and temperature signal that receive are filtered and amplified respectively
In；Single-chip microcomputer by pressure signal and temperature signal compared with the predictive encoding order being stored in single-chip microcomputer EEPROM, if
Pressure signal is consistent with predictive encoding order, and SCM system is according to positive or negative detonation coded command, control and circuit producing work
The current potential of the connected single-chip microcomputer pin of KA, KB, KC, KD, circuit producing work output end OUT1, OUT2 output positive or negative polarity voltage, rises
Quick-fried perforating bullet；The temperature sensor uses thermocouple, thermistor or radiation temperature sensor.
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| CN108825179B (en) * | 2018-05-31 | 2020-09-25 | 西安物华巨能爆破器材有限责任公司 | Wireless coding detonation control device |
| CN110529083B (en) * | 2019-08-13 | 2021-11-30 | 西安物华巨能爆破器材有限责任公司 | Multi-stage pressure coding detonating device for oil pipe transmission perforation |
| CN112761593B (en) * | 2021-02-01 | 2022-09-16 | 大庆油田有限责任公司 | Intelligent pressure control perforation and bridge plug combined operation method |
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| CN103696742A (en) * | 2013-11-26 | 2014-04-02 | 中国石油集团川庆钻探工程有限公司 | Ignition control circuit for underground electric detonator for perforation |
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