CN201502870U - Oil delivery pipeline leakage detecting and positioning device based on GPRS - Google Patents

Abstract

Disclosed is an oil delivery pipeline leakage detecting and positioning device based on GPRS. The existing oil delivery pipeline leakage detecting and positioning device utilizing a negative pressure wave method is inaccurate in leakage point positioning, high in construction cost and unsuitable for detecting leakage of oil delivery pipelines of actual remote areas. At present, leakage is checked in site manually. The oil delivery pipeline leakage detecting and positioning device comprises a center system, the center system is connected with a group of sub systems and comprises a GPRS (1) and a PC machine (2), each sub system comprises a controller (3), a GPRS (4), a GPS (5), a one-way valve (6) and a sensor (7), wherein the one-way valve (6) and the sensor (7) are arranged on an oil delivery pipeline, the controller comprises a CPU, and the CPU is connected with an RS232 (1), an RS232 (2), an EEPROM, an A/D conditioning circuit, a lithium ion charging battery, a power monitoring circuit and a nonvolatile storage. The oil delivery pipeline leakage detecting and positioning device is used for detecting and positioning leakage of oil delivery pipelines.

Description

Oil transport pipeline Leak testtion and positioning device based on GPRS

Technical field:

The utility model relates to fluid leakage detection technology, is specifically related to a kind of escape of liquid based on radio communication and detects and the Instrument working state monitoring device.

Background technique:

The existing negative pressure wave method that utilizes is realized oil transport pipeline Leak testtion and positioning device, process control machine is used in the collection of on-the-spot Operational Limits, not only cost an arm and a leg, safeguard inconvenience, and transmission means adopts telephone network or industrial bus, the capital increases operating expenses, is not suitable for actual oil transport pipeline Leak testtion from far-off regions.

Summary of the invention:

The purpose of this utility model is to provide a kind of Leak testtion and navigation system of quick, effective, practical oil transport pipeline, so that promptly and accurately find the scope and the degree of leakage accident, reduce economic loss and environmental pollution to greatest extent, improve whole oil recovery factory automatic management level.

Above-mentioned purpose realizes by following technological scheme:

Oil transport pipeline Leak testtion and positioning device based on GPRS, its composition comprises: centring system, described centring system connects one group of subtense angle, described centring system comprises GPRS communication module GPRS and central computer CPU, described subtense angle comprises controller and GPRS, global position system GPS and be installed in one-way valve and sensor on the oil transport pipeline, described controller comprises RS232 (1) interface with described center processor CPU, RS232 (2 interface), EEPROM, the A/D conditioning circuit, switching value is adjusted circuit, Li-Ion rechargeable battery, electric source monitoring circuit and nonvolatile memory.

Described oil transport pipeline Leak testtion and navigation system, its operating temperature range-40 °～85 °.

The beneficial effects of the utility model:

1. the utility model has adopted GPS to guarantee the synchronous of different measuring points sampled data, utilize wavelet transformation to extract the feature of pressure wave signal, sensitivity can reach higher level, and Location accuracy can reach below 2% of adjacent measuring point spacing, the rate of false alarm of system is lower than 2%, and the reaction time was less than 110 seconds.

2. because each subtense angle of the utility model adopts microprocessor to replace in the past process control machine, and adopt modular designs, have the cost performance height, be convenient to the characteristics of safeguarding and installing.Native system human-computer interaction interface close friend is simple to operate simultaneously, and is directly perceived.

3. adopt GPRS transmission data between the utility model centring system and subtense angle, have broad covered area, the transfer rate height, online continuously, the transmission reliable characteristics.

Description of drawings:

Accompanying drawing 1 is the General layout Plan schematic representation of negative pressure wave method oil transport pipeline Leak testtion of the present utility model and positioning device.

Accompanying drawing 2 is structural representations of the present utility model.

Accompanying drawing 3 is that controller of the present utility model connects block diagram.

Accompanying drawing 4 is circuit diagram of the utility model controller part.

Accompanying drawing 5 is circuit diagram of the non-memory loss memory module part of the utility model.

Accompanying drawing 6 is circuit diagram of the utility model EEPROM part.

Accompanying drawing 7 is circuit diagram of the utility model GPRS module section.

Accompanying drawing 8 is circuit diagram of the utility model switching value input part.

Accompanying drawing 9 is circuit diagram of the utility model power supply testing module part.

Accompanying drawing 10 is circuit diagram of the utility model analog amount input part.

Accompanying drawing 11 is circuit diagram of the utility model A/D modular converter part.

Accompanying drawing 12 is circuit diagram of the utility model power transfer module part.

According to electronic circuit drawing regulation, has annexation between the circuit of same numeral.

Embodiment:

Embodiment 1:

Oil transport pipeline Leak testtion and navigation system, its composition comprises: centring system, described centring system connects one group of subtense angle, described centring system comprises GPRS1 and PC 2, described subtense angle comprises controller 3 and GPRS4, GPS5 and is installed in one-way valve 6 and sensor 7 on the oil transport pipeline, described controller comprises CPU, and described CPU connects RS232 (1), RS232 (2), EEPROM, A/D conditioning circuit, Li-Ion rechargeable battery, power supply monitoring, nonvolatile memory.

As shown in Figure 2, if main line L section between platform 1 and the platform 2 is carried out Leak testtion and leakage point location, should one-way valve be installed at two terminal B and the C of L, the leakage situation that can correctly reflect the oil transport pipeline in the L section with the pressure transducer of guaranteeing the installation of b and c point, if one-way valve is not installed, the operation conditions of oil well should be rung b point sensor force value on the platform 1, simultaneously, the operation conditions of oil well will influence c point sensor force value on the platform 2, and causing can't be according to the leakage situation of b point, c point sensor force value data analysis L section main line.

Centring system: centring system is installed on the working area monitoring chamber, mainly comprise GPRS and PC two-part, receive the data information of each subtense angle transmission by GPRS, then, the information that GPRS is received sends PC to again by the RS485 serial communication, uses the application software of VC establishment on PC, analyzes receiving data, conclude and handle, to realize oil transport pipeline Leak testtion and location.

Subtense angle: subtense angle be installed on survey on the tube wall, realize collection and storage to Operational Limitss such as pressure, flow and temperature, judge according to the variation of Operational Limits whether Operational Limits unusual, and the data transmission of realization and centring system.Mainly comprise controller, GPRS and three parts of GPS.

The connection of controller is as shown in Figure 3: the analog amount finishing circuit is finished the arrangement to analog circut, finish the digital signal that A/D passage that signal condition to pressure transducer, flow transducer and temperature transducer becomes CPU can be accepted by the A/D change-over circuit, link to each other with CPU.The arrangement that the switching value finishing circuit is finished switch amount links to each other with CPU.Nonvolatile memory links to each other with CPU and is used for real-time acquisition subsystem pressure, and Operational Limitss such as flow and temperature occur when unusual when CPU judges Operational Limits, is stored in nonvolatile memory with unusual a large amount of sampled datas before and after constantly occurring.Li-Ion rechargeable battery links to each other with CPU and is used for the subtense angle power supply.EEPROM links to each other to be mainly used in CPU and deposits relevant definite value.Whether power supply monitoring links to each other with CPU and is used for CPU and monitors Li-Ion rechargeable battery voltage in real time, will change or charge to guarantee the normal operation of subtense angle with the decision Li-Ion rechargeable battery.RS232 is the electrical level conversion circuit that links to each other with CPU.

The information of subtense angle collection is for mainly comprising:

(1) the destroyed information of theft-proof room;

(2) oil recovery well outage information;

(3) petroleum pipeline pressure information;

(4) electrical tracing work state information;

(5) transformer power failure information;

Working principle of the present utility model:

When oil transport pipeline took place to leak, oil body ran off rapidly under the effect of inside and outside differential pressure in the pipeline, can cause that this oil body pressure reduces in the pipeline.The pressure of oil body between the zone on leakage point and the both sides that are adjacent produces difference, and cause the area of low pressure at the high pressure oil direction of flow leakage point place in the zone, the adjacent upstream and downstream of leakage point, from and cause and leakage point adjacent area oil body density reduces and the pressure reduction, this phenomenon from leakage point along pipeline successively roam all around the would up and down form suction wave to diffusion.Along including leakage information in the suction wave of pipe transmmision.As long as can capture the suction wave that comprises leakage information, just can detect the generation of leakage, and carry out leakage point and locate according to leaking time difference that the suction wave that produces propagates into pipe ends at pipe ends setting pressure sensor.

The process that suction wave is propagated from leakage point trip up and down simultaneously is similar to the propagation of sound wave in medium, and suction wave velocity of propagation a is the velocity of propagation of sound wave in oil body, between 1000～1200m/s.Along including leakage information in the suction wave of pipe transmmision.As long as can capture the suction wave that comprises leakage information, just can detect the generation of leakage, and carry out leakage point and locate according to leaking time difference that the suction wave that produces propagates into pipe ends at pipe ends setting pressure sensor.The basic principle of negative pressure wave method Leak testtion and location as shown in Figure 1.X is the distance (m) of leakage point apart from the upstream measuring point among the figure; L is the spacing (m) of upstream and downstream measuring point; t ₁Propagate into the time of leakage point upstream measuring point for the suction wave of leakage point place generation.t ₂Propagate into the time of leakage point downstream measuring point for the suction wave of leakage point place generation.Δ t is that suction wave propagates into poor (s) that upstream measuring point time and suction wave propagate into the downstream measuring point time.

If t _LBe the propagation time (s) of suction wave, then have through omnidistance L:

t _L＝t ₁+t ₂ (2)

In the formula,

By (2) formula as can be known:

${\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="H2009201005488E00041.png,H2009201005488E00042.png"\; state="\{\{state\}\}">t</figure-callout>}}_1=\frac{t_L-\mathrm{\&Delta;t}}{2}---\left(3\right)$

Then leakage point can be expressed as according to the distance of upstream measuring point:

$x=\frac{L+\mathrm{a\&Delta;t}}{2}---\left(4\right)$

The technological difficulties of negative pressure wave method oil transport pipeline Leak testtion and navigation system and solution:

By leakage point ranging formula (4) as can be known, the parameter that influences Location accuracy comprises the distance L of adjacent measuring point; Velocity of propagation a and the suction wave time difference Δ t that propagate into upstream and downstream measuring point of suction wave in oil body.Wherein, L can measure when selected measuring point accurately, below main a and the Δ t of discussing:

(1)a

The velocity of propagation a of suction wave in oil body influences the pinpoint important parameter of leakage point.Suction wave is regarded as constant usually in ducted velocity of propagation, and generally at 1000～1200m/s, in fact, the negative pressure velocity of wave propagation is determined by following formula:

$a=\sqrt{\frac{K/\mathrm{\&rho;}}{1+\left[(K/E)(D/e)\right]C_1}}---\left(5\right)$

In the formula, K is the volume modulus (Pa) of oil body; ρ is the density (kg/m of oil body ³); E is the Young's modulus (Pa) of tubing; D is pipe diameter (m); E is pipe thickness (m); C ₁Be the correction factor relevant with pipeline constraint conditio; Parameter K is the variable relevant with the oil body temperature with ρ, can be by the distribution of oil body temperature in the measuring channel, adopt intelligent method to set up the oil temperature with the duct length variation model, set up oil body elasticity coefficient K with oil body temperature model and oil body density p with oil body temperature variation model, finally obtain reflecting the parameter K and the ρ of actual conditions, and then obtaining the velocity of propagation of suction wave in oil body accurately, other parameter can obtain by actual measurement.

(2)Δt

The time difference Δ t that suction wave propagates into the upstream and downstream measuring point influences pinpoint another important parameter of leakage point.Analyzing the negative pressure wave signal sequence of leaking initiation, determine that negative pressure wave signal propagates into the upstream and downstream measuring point constantly, an obvious requirement is that the initial moment of upstream and downstream pressure signal sequence should be consistent, keep synchronously, native system adopts GPS to unify the clock of each controller, realize whole system target requirement when unified, implement also easily that cost is also cheaper.

When actual Leak testtion and location, centring system is analyzed the data that each measuring point transmits, and therefrom seeks leakage information.To accurately determine to leak the time difference Δ t that the suction wave that causes propagates into the upstream and downstream measuring point, just must determine earlier that suction wave propagates into the moment of upstream and downstream measuring point, promptly needs to capture exactly the character pair that suction wave propagates into upstream and downstream measuring point burst.Yet because the inevitably existence of the factors such as vibration of the electromagnetic interference of industry spot, oil transfer pump, the suction wave waveform that collects is adding a large amount of noises.Feature corners how accurately to isolate signal from the signal of noise interference is pinpoint key.Native system adopts wavelet transform that pressure wave signal is carried out feature extraction, adopts the bank of filters method to calculate wavelet transformation fast in the practical application and accurately determines the pressure wave signal flex point, and then accurately calculate Δ t, guarantees Location accuracy.

Element is selected:

CPU：

Core for controller, can adopt the STM32F103VBT6 chip, this chip uses the RISC kernel of 32 of high performance ARM Cortex-M3, frequency of okperation 72MHz, built-in high-speed memory (up to the flash memory of 128Kbyte and the SRAM of 20Kbyte), abundant I/O port comprises the communication interface of 2 12 ADC, 3 general 16 bit timing devices and standard, has high cost performance.In addition, this chip can work in-40 °～105 °, and operating voltage is 2V～3.6V, and it is big to satisfy native system operating temperature span, and field work is wanted energy-conservation characteristics.

RS232 (1) and RS232 (2):

CPU is being connected by RS232 (1) and RS232 (2) realization and GPS and GPRS respectively.Can adopt the MAX232 of MAXIM company to realize of the conversion of CPU standard serial port Transistor-Transistor Logic level, realize increasing reliability of data transmission to RS232.

EEPROM：

Be mainly used in and deposit relevant definite value.Native system adopts the serial EEPROM chip AT24C01 of AT series.

The A/D conditioning circuit:

The signal of pressure transducer, flow transducer and temperature transducer is nursed one's health the signal that the A/D passage that becomes CPU can be accepted, and main chip is MAX1135.

Li-Ion rechargeable battery:

By Li-Ion rechargeable battery is the subtense angle power supply.

Power supply monitoring:

Whether CPU monitors Li-Ion rechargeable battery voltage in real time, will change or charge to guarantee the normal operation of subtense angle with the decision Li-Ion rechargeable battery.

Nonvolatile memory:

Subtense angle is gathered pressure in real time, Operational Limits, when judging Operational Limits, CPU occurs when unusual, be stored in nonvolatile memory with unusual a large amount of sampled datas of front and back constantly occurring, and will store data by GPRS as early as possible and be sent to centring system, nonvolatile memory can be selected the FM22L16 of RAMTRON company for use, and this chip operating voltage is that operating voltage is 2.7V～3.6V, operating temperature-40 °～85 °.

GPRS：

GPRS is a kind of new packet data bearers business.The circuit switched data load mode of the dial mode of original relatively GSM, GPRS is a packet-switch technology, adopts packet switched mode to transmit data and signaling in an efficient way.GPRS is on the GSM network foundation, the equipment of original GSM network subsystem and wireless subsystem and function is strengthened forming.GPRS has broad covered area, and the transfer rate height is online continuously, the transmission reliable characteristics.Native system adopts GPRS to realize the data transmission of subtense angle and centring system.

GPS：

Employing GPS realizes the synchronism of each measuring point image data, with the basis of synchronous data as Leak testtion and positioning analysis, with the accuracy of guaranteeing to locate.

Claims (2)

1. oil transport pipeline Leak testtion and positioning device based on a GPRS, its composition comprises: centring system, it is characterized in that: described centring system connects one group of subtense angle, described centring system comprises GPRS communication module GPRS and central computer CPU, described subtense angle comprises controller and GPRS, global position system GPS and be installed in one-way valve and sensor on the oil transport pipeline, described controller comprises RS232 (1) interface with described center processor CPU, RS232 (2 interface), EEPROM, the A/D conditioning circuit, switching value is adjusted circuit, Li-Ion rechargeable battery, electric source monitoring circuit and nonvolatile memory.

2. oil transport pipeline Leak testtion according to claim 1 and navigation system is characterized in that: its operating temperature range-40 °～85 °.

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