CN2341131Y - All range inspector for crude oil tank - Google Patents

Abstract

The utility model relates to an all range inspector for crude oil tanks, which is the combination of a grating-shaped scanning sensor, a control circuit and a liquid depth detecting probe. The grating-shaped scanning sensor is vertically sunk into the bottom of an oil tank. The grating-shaped scanning sensor scans the electrode of a grating-shaped capacitor segment which vertically sinks into the bottom of the oil tank up and down continuously. Different segment electrodes are switched on, the oscillatory circuit of the scanning circuit generates the oscillatory signal of corresponding frequency, and signal frequency is counted. By comparing the control circuit with preset values, which segment electrode is in an oil-water interface is known from the comparing result. By combining the position of the grating-shaped capacitor of the electrode, thereby, the height of the crude oil is known. In respect to existing detection methods, the utility model has the advantages of time saving, labor saving, and high detection precision.

Description

A kind of gamut pick-up unit of crude oil basin

The utility model belongs to metering and the pick-up unit to crude oil liquid amount in the oil tank of oil field, particularly a kind of device that can carry out the gamut detection to the crude oil in the oil tank, sewage, mud.

The oil field from oil well adopt crude oil through behind the decon, dewatering process, become qualified separator oil, be injected in each oil tank, to treat outer defeated or allocation and transportation.Because impurity elimination, dehydration are not thorough, as time passes, can be at the mud of the about 10cm-50cm of oil tank bottom deposit one layer thickness, one section sewage in addition above is only crude oil above the sewage.Because the oil field will be understood the output of oil recovery factory at any time, therefore generally need three to four hours will be once to store oil measurement amount.And present measuring method is to climb up oil tank by the workman, hangs a weight from artificial mouthful with rope or tape measure and oil mass is measured (to the distance of tank deck), effort and inaccurate.The someone utilized the ultrasonic ranging method to replace manual measurement in recent years, also have static pressure type pressure transducer (being that common liquid is popped one's head in deeply) sunk to jar at the bottom of near, directly measure the height of oil level.Though this method measuring accuracy is higher, also has wretched insufficiency, at first be that pressure probe can not sink to bottommost, otherwise mud can stop up transfer hole, secondly, because the data that record are the above height until pasta of popping one's head in, it is then unknown how much crude oil, sewage, mud respectively accounts for.So the definite quantity that obtains crude oil not only must be known the height of pasta, also must understand the position of water-oil interface, this problem is not resolved always for these years.Every centimetre height capacity has 2M in the kiloton oil tank ³, then be 4-8M in the ton oil tank ³/ centimetre, and therefore the sewage highly of general oil tank bottom is very inaccurate according to present measuring method between 0.5-2M.For measuring water-oil interface, the someone attempts to be promoted repeatedly and descend about 2m at tank bottom with microwave remote sensor, thereby finds water-oil interface, but considers that error is too big and do not adopt.Therefore, also do not find the good method that addresses this problem at present.

The purpose of this utility model is to provide a kind of water-oil interface position that not only can measure in the oil tank, can carry out the pick-up unit that gamut is measured simultaneously to the content of crude oil, sewage, mud.

For realizing this purpose, the utility model adopts a palisade scanning sensor and the dark detection probe of liquid to combine, the palisade scanning sensor is vertically sunk to tank bottom, by its scanning up and down constantly, utilize different medium that the principle of differing dielectric constant is arranged, measure the height of mud, sewage and water-oil interface.

Its concrete technical scheme is; A kind of gamut pick-up unit of crude oil basin, this device comprises the palisade scanning sensor, the dark detection probe of control circuit and liquid, wherein the palisade scanning sensor is packaged together by palisade capacitor and sweep circuit and forms, the palisade capacitor is made up of with one group of the same palisade segment electrode of shape and size a public electrode, there is a layer insulating to contact between each segment electrode and the public electrode with medium, sweep circuit comprises several groups of each segment electrodes selection circuit of being made up of a counter and multiway analog switch, the oscillatory circuit that is connected with analoging switch output end and a total counter, every output terminal of total counter selects circuit input end to be connected by gate circuit with each group segment electrode respectively, each multiway analog switch connects the correspondent section electrode of palisade capacitor, clock oscillator in the control circuit connects frequency dividing circuit, the frequency dividing circuit output terminal connects by gate circuit and is used for sweep record counter that the segment electrode number that is scanned is counted, the segment electrode that connects in the sweep circuit by gate circuit is selected circuit output scan synchronizing signal simultaneously, output end of oscillating circuit in the sweep circuit is by the oscillation frequency counter in the gate circuit connection control circuit, the oscillation frequency counter output connects latch, latch connects digital comparator, another termination load switch of digital comparator.

By the scan synchronizing signal output terminal of optocoupler connection control circuit, output end of oscillating circuit is also by the optocoupler connection control circuit in the sweep circuit before the gate circuit of segment electrode selection circuit.

On the sweep record counter, be connected to height pre-value load switch.

For a capacitor, at its physical dimension, manufactured materials one regularly, the size of its electric capacity depends on the DIELECTRIC CONSTANT of measured medium.The utility model combines with a palisade scanning sensor and control circuit and the dark detection probe of liquid, vertically sink to the palisade capacitor segment electrode of tank bottom by scanning constantly, connect different segment electrodes, oscillatory circuit in the sweep circuit will produce the oscillator signal of corresponding frequencies, signal frequency is counted, compare with default value by control circuit, just can learn that by comparative result which segment electrode is in the water-oil interface position, and in conjunction with this segment electrode residing position in the palisade capacitor, can draw the height of crude oil, based on as a same reason, also can draw sewage and mud height separately, thereby realize that gamut detects.With respect to conventional detection, utilize utility model to detect to save time, laborsaving the accuracy of detection height.

Further specify the utility model below in conjunction with accompanying drawing and by embodiment:

Fig. 1 is palisade scanning sensor and the installation site synoptic diagram of the dark detection probe of liquid in oil tank;

Fig. 2 is the structural representation of palisade capacitor;

Fig. 3 is the part of palisade capacitor and the connection diagram of sweep circuit;

Fig. 4 is the sweep circuit schematic diagram;

Fig. 5 is the control circuit schematic diagram;

Fig. 6 is the sequential chart of control circuit.

Embodiment, as shown in Figure 1, palisade capacitor and sweep circuit are packaged together and have formed palisade scanning sensor 10, vertically sink to oil tank 1 bottom, the dark detection probe 2 of liquid is installed at certain position at sensor, the palisade scanning sensor is connected with control circuit 8 by transmission line 7, and crude oil shown in the figure 3, sewage 4, mud 5, water-oil interface 6 have reflected the distribution in the oil tank.

The palisade capacitor is the capacitor group that size is the same one by one capacitor homeotropic alignment gets up to be palisade, A001, A002 ... these serial numbers of Ax are represented an electrode of each electric capacity, their size is all the same with spacing, we claim that they are segment electrode, on their opposite is the public electrode 9 that connects together, between segment electrode and the public electrode 9 insulation course is arranged, each segment electrode and public electrode are all formed a capacitor, each segment electrode does not link to each other mutually, and all sequentially selects an analog switch to link to each other with 16 of sweep circuit respectively.In the present embodiment, the width of every split electrode is 0.9cm, and spacing is 0.1cm.The actual connection of which section segment electrode and analog switch, see analog switch input end A, B, C, D data and decide, varying input signal is connected different segment electrodes, connect different capacitor C x, the size of Cx will be decided by the ε of the medium between this electrode and the public electrode, so detect the ε of medium, just become the size of the oscillation frequency that detects oscillator.And the specific inductive capacity of measured medium depends on water percentage, according to on-the-spot test, the little 30-40 of DIELECTRIC CONSTANT s of the DIELECTRIC CONSTANT y ratio sewage of crude oil (moisture 0.5%) (containing crude oil below 3%) times, so the electric capacity of segment electrode is very big in water-oil interface difference up and down.The specific inductive capacity of tank bottom mud occupies between the two.In testing process, from first section A001 to A002 ... Ax detects each capacitor volume size in order, diminish as A101 when detecting a certain section suddenly, illustrate that this position is water-oil interface, here apart from the bottom 100 capacitor height, again in conjunction with the above height h of the detected probe of the dark detection probe of liquid that is fixed on a certain segment electrode of sensor position (as the A200 place) up to the crude oil pasta, just can draw the crude oil gross thickness is h+ (A200-A100), and the size of each segment electrode is known.

Fig. 4 is the sensor scan circuit theory diagrams, in the figure, 16-0,16-1 ... 16-9 is the palisade segment electrode among Fig. 3, U12, U13 ... U21 promptly 16 selects 1 analog switch, M041, M042 ... M050 is an oscillatory circuit, be connected with analoging switch output end, U22-U26 is a frequency counter, its effect is that oscillation frequency is reduced to stable count pulse, 4. exports to the control circuit terminal 3. by optocoupler GH02-GH06 from terminal, and 2. terminal is clear terminal, when control circuit was sent positive pulse here, counter U1-U11 was " zero " state.At this moment the Qo of U1 is output as high level, it makes M02, the output terminal of M09 is a high level, M05 is a low level, and U2 still is " 0 " state, be output terminals A=B=C=D=0, M05 makes U12 enter selection mode simultaneously, because input signal is " 0 ", so the 1st section capacitance electrode A001 of actual connection, and the high level of M09 makes M041 enter oscillatory regime, and by the U22 frequency division, 4. the conversion of GH02 begins the signal that outputting oscillation signal is promptly represented A001 section capacitance from terminal, when terminal 3. when 1. the control circuit terminal sends first synchronization pulse here, pass through GH01, M01, M02 makes the U counter count " 0001 " state, at this moment the 1st pin of U12 disconnects M041 with segment electrode A002 connection and with A001 again, M042 by GH02 to terminal 4. send represent A002 signal to control circuit.3. send into the 2nd pulse from terminal equally, 4. terminal has exported the signal of representing A003 section electric capacity again ... send the 15th pulse U12 here and connect A016 section electric capacity, up to sending into the 16th pulse, U2 output becoming " 0 " state simultaneously at its carry end Co place, is exported a positive level, give carry pulse of U1, make the Qo step-down of U1, Q1 becomes high level, and M02 output at this moment becomes low level, M05 output becoming high level, make U12 be in full closing state, opposite because M04 output uprises the output level step-down of M06, U13 enters duty, A017 section capacitance electrode has been connected in its output, and 4. terminal exports the oscillator signal of representing A017 electric capacity again, so goes down, after the signal of final stage electrode is sent, turn back to " 0 " state, this circuit is packaged in the sensor as the part of sensor.

Fig. 5 is the control circuit schematic diagram, and major function is the electric capacity size that produces and write down scan synchronizing signal and test and judge each section electric capacity, the i.e. size of the oscillation signal frequency that produces therefrom.M1 among the figure, M2 and related elements thereof are formed clock oscillator, through U1, the U2 frequency division is the 2nd of U2 the, 3 pin obtain the signal of 2HZ and 1HZ respectively, U2-2 among waveform such as Fig. 6 and the shape of U2-3, the U2-3 signal is through M14, M11, M12 makes sweep record counter U4-6 carry out the addition numeration, its count value has been represented the height of the segment electrode in being scanned in the sensor, simultaneously, pulse of every input, 1. 3. also send to a pulse to the terminal of sweep circuit from M13 and optocoupler GH1 by terminal, make the two synchronous conversion, in sensor, choose the oscillator signal that produces after the corresponding capacitance, the terminal that turns back to this circuit through transmission line 3., give control gate M17 through optocoupler GH2, the gate-control signal of M17 produces (see figure 6) by M16, its high level pulse is at the 3rd T/4 of periodic signal T in the time, purpose is for after certain section electric capacity is selected, after the chien shih oscillation frequency is stablized when half period T/2 earlier, open control gate M17 again at the 3rd T/4, give counter U9 signal, U10, U11 counts.In the same time, count value is big, expression frequency height (ε of medium is little), on the contrary the same.U12, U13, U14 is a register, be respectively a position, ten, hundred bit data, their input end links U9-11 respectively, output terminal is given digital comparator U15, U16, U17, from Fig. 6 as seen, the M16 enabling signal finishes the pulse negative edge of back (being that the U9 counting finishes), after sending monostable circuit U7-1 to make it to produce one period time delay by M18, send a burst pulse by U7-2, anti-phase through M20, open the input gate of register U12-14, the count results of current U9-11 is latched in the register, in order to handling, up to the next cycle again row change, behind data latching, again through τ after a while, by U8 and M19 with counter U9, U10, U11 carries out clearly " 0 ", prepares against the next cycle and counts again.

U15, U16, U17 are digital comparator, and its A one sides individual, ten, hundred are the output terminals of U12, U13, U14, and the opposing party B is load switch KB-12, such as the height that will survey water-oil interface, switch is pressed individual, ten, hundred positional numbers.In the present embodiment, actual measurement sewage count value is " 106 ", and pure crude oil counting can be put KB-12 " 180 " for " 231 ".Every like this A number formulary value then is judged to crude oil more than or equal to " 180 " person, then is sewage less than this value.M21-M24 is a judging circuit, in case A 〉=B occurs, is illustrated as interface location, by Y output terminal output signal, exports the height number signal and send computing circuit to handle to the scanning height display circuit SCR with this matched with devices.

KB-12 also can connect one group of switch (not drawing among the figure) again, detects the interfacial level of mud and sewage with same manner.

KA-12 directly is not inserted into tank bottom in order to work as sensor, and the height preset value switch that is provided with.

U3 and M3, M4, M6-M10 and K switch 1, K2 be automatically, manual switch uses; When K1 pushes " 1 " position, can manually detect by K2.

Claims (4)

1, a kind of gamut pick-up unit of crude oil basin, it is characterized in that, this device comprises the palisade scanning sensor, the dark detection probe of control circuit and liquid, wherein the palisade scanning sensor is packaged together by palisade capacitor and sweep circuit and forms, the palisade capacitor is made up of with one group of the same palisade segment electrode of shape and size a public electrode, there is a layer insulating to contact between each segment electrode and the public electrode with medium, sweep circuit comprises several groups of each segment electrodes selection circuit of being made up of a counter and multiway analog switch, the oscillatory circuit that is connected with analoging switch output end and a total counter, every output terminal of total counter selects circuit input end to be connected by gate circuit with each group segment electrode respectively, each multiway analog switch connects the correspondent section electrode of palisade capacitor, clock oscillator in the control circuit connects frequency dividing circuit, the frequency dividing circuit output terminal connects by gate circuit and is used for sweep record counter that the segment electrode number that is scanned is counted, the segment electrode that connects in the sweep circuit by gate circuit is selected circuit output scan synchronizing signal simultaneously, output end of oscillating circuit in the sweep circuit is by the oscillation frequency counter in the gate circuit connection control circuit, the oscillation frequency counter output connects latch, latch connects digital comparator, another termination load switch of digital comparator.

2, pick-up unit as claimed in claim 1 is characterized in that, by the scan synchronizing signal output terminal of optocoupler connection control circuit, output end of oscillating circuit is also by the optocoupler connection control circuit in the sweep circuit before the gate circuit of segment electrode selection circuit.

3, pick-up unit as claimed in claim 1 is characterized in that, is connected to height pre-value load switch on the sweep record counter.

4, as claim 1 or 2 or 3 described pick-up units, it is characterized in that, be provided with manual switch in the control circuit.

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