CN2090048U - Continuous measure device for single well day production of oil well - Google Patents

Abstract

The utility model relates to a continuous measure device for the single well day production of an oil well, belonging to the measuring equipment of oil production. The continuous measure device for the single well day production of an oil well is a continuous measuring device for synchronically measuring volume and quality, comprising an oil-gas separator, an altitude measuring device for water level and liquid level, and a microcomputer. The continuous measure device for the single well day production of an oil well is characterized in that the altimeter of the liquid level adopts a pair of wall-attachment liquid level electrode in a capacitance type; the altimeter of the water level adopts an adherence liquid level electrode in a capacitance type; the outputs of the altimeters of the liquid level and the water lever are both connected with the microcomputer having the function of timer interruption by a resistance capacitance oscillator and a counter respectively. The measuring error of the pure oil mass of the utility model relates to +-5%, which is different according to water contents.

Description

Continuous measure device for single well day production of oil well

Oil field individual well daily oil production continuous metering device belongs to the well recovery metering outfit.

At present generally adopt densimetry to measure the pure oil content of oil well oil water mixture.It is based on the volume of mixed liquor and these two amounts of density, realizes automatic continuous measuring by computing machine again.The resistance type liquidometer indirect determination of its volume, density is measured with densitometer, also will use the high temperature modification densitometer instead when the temperature of tested mixed liquor is higher than 80 ℃.When measuring, densitometer requires the fluid to be measured flow even, but oil-water mixture is the potpourri of a kind of oil, G﹠W, thereby accuracy can't guarantee, and the accuracy for keeping measuring, and needs often maintenance, and price is also expensive in addition, wants 8,000 yuan for every.For this reason, " oilfield surface engineering " magazine VOL.7, NO.1, " research of the oil well oil-gas-water metering method " literary composition that publishes on P.48 discloses a kind of volume-quality determination method and corresponding automatic continuous measuring device of oil field individual well daily oil production, asks for an interview the principle schematic of Fig. 1.Wherein, the 1st, the measuring room of separation vessel, the 2nd, pure water bag, the 3rd, oil gas entry to mixed solution pipe, the 4th, solenoid valve, the 5th, gas balance pipeline, the 6th, oil-collecting service main, the 7th, mixture export pipeline, F ₁, F ₂Be two needle electrodes of resistance type liquidometer, H is an anode-cathode distance, F ₃It is the float-type electrode.Enter the measuring room of separation vessel when mixed liquor after, gas-liquid begins to separate.Gas makes progress, and liquid is downward, and solenoid valve 4 is in opening this moment, makes the pressure equilibrium of trap pressure and service main.Along with the rising of liquid level, water level is from electrode F ₁The place also begins to rise F ₁Controlling microcomputer simultaneously picks up counting.When water level rises to electrode F ₂The time, F ₂The control microcomputer begins memory by F ₁Rise to F ₂Weight metering time t ₁When mixed liquor is led over water level and arrived F in advance owing to light specific gravity ₃The time, F ₃Just control the microcomputer memory from F ₁Rise to F ₃Volume metering time t ₂Simultaneously, F ₃By the commutation of system controlled by computer solenoid valve, make it be in closed condition.At this moment, the gaseous tension in the separation vessel measuring room makes mixed liquor flow into service main from outlet greater than service main pressure.Liquid level is correspondingly from F ₃Begin to descend, when arriving F ₁The time, F ₁Just controlling microcomputer writes down from F ₃Drop to F ₁Survey gas (or the claim discharge opeing) time.Meanwhile, F ₁By microcomputer control electromagnetic valve commutation once more, make it to be in once again opening, thereby finished a metering cycle, enter next cycle automatically.This scheme can't practicability owing to there are following three problems.At first, it does not reach the time synchronisation requirement of design.When design, its original idea is to want to make electrode F ₁Play the effect of water level and liquid level bottom electrode simultaneously, so that carry out synchronously when making weight timing and volumescope, so that reduce the error that causes owing to asynchronous timing to greatest extent.But can't achieve this end actually, this be because: the liquid level of each metering back residual mixed liquor changes, and height of water level also can be owing to the consumption in the use in decline, thereby the two can't be on the same surface level all from F at all ₁The position begin timing.Thereby do not adopt this cover technological thought and device aborning, but all must redefine the position of liquid level under the mixed liquor so that go to control its time zero with ultrasound wave or r ray with this at every turn, thus equipment investment is also greatly increased.The second owing to go to judge with float type level gauge whether the mixed liquor liquid level has arrived liquid level, in case thereby float stained by the crude oil in the liquid, the accuracy of volume metering is affected.The 3rd, in this scheme, the bottom of water level liquid level gauge there is not in the entry, in case surface level descends, mixed liquor will enter stains needle electrode in the water level gauge, causes that the density of water changes, and it also can influence the accuracy of weight timing.Thereby device shown in Figure 1 is practicability not so far.

The purpose of this utility model is exactly to solve the volume metering that exists in oil field individual well daily oil production volume-mass method mensuration process and the problem of reliability, accuracy and practicability on the weight metering time measure.

The utility model is the continuous metering device that a kind of oil field individual well daily oil production volume-quality is measured formula synchronously, it is by oil-water separator, water level and liquid level emasuring device and microcomputer constitute, it is characterized in that, the height of water level measurement mechanism is relative with two and form along the adherent capacitance type liquid level electrode that pipe range sticks at tube wall surface by a water pipe, its length will be a bit larger tham the maximum vertical penetration of water level, its liquid level measurement mechanism is made up of (mixing) liquid pipe and a pair of attached wall capacitor formula level electrode that is connected to it from outer cover, and the output of these two kinds of capacitive transducers is the resistance-capacitance oscillator by separately respectively all, counter links to each other with a microcomputer with timing interrupt function.The synchronous mensuration formula of wherein mentioning refers to: water, liquid level each to rise to the upper required time be related assays since the next, in other words, its timing markers is identical.Particularly be exactly: will make the upper and lower position of liquid level rightly and put corresponding electrode according to the permission capacity of mixed liquor in the separation vessel earlier; Again under the control of computing machine, the residing position of the corresponding water surface of the moment that arrives its upper and lower liquid level with liquid level is used as the random site of upper and lower water level at this moment, obtain the lifting height of its water surface more in view of the above, calculate the quality and the volume of mixed liquor in the unit interval thus, so also claim (upper and lower water level)-fixing (upper and lower liquid level) electrode method at random.

Experimental result shows: volume-quality is measured the requirement that the formula continuous metering device has reached well recovery practicability synchronously, and its measuring accuracy also is higher than traditional densimetry, and its equipment is also greatly simplified.

In order in conjunction with the embodiments the present invention to be described in detail below, now employed accompanying drawing title of present specification and numbering thereof are summarized as follows:

Fig. 1: disclosed oil-gas-water three-phase metering separation vessel synoptic diagram;

Fig. 2: volume-quality is measured formula metering separator synoptic diagram synchronously;

Fig. 3: attached wall capacitor formula level electrode vertical view;

Fig. 4: attached wall capacitor formula level electrode side view;

Fig. 5: attached wall capacitor formula level electrode group connects figure with external circuit.

Embodiment:

Ask for an interview Fig. 2.When solenoid valve 8 was opened, oil-water mixture injected separation vessel 10 from inlet tube 9, and gas-liquid is also separated thereupon.Gas upwards flows to service main by the gas balance pipe 11 at separation vessel top, and the flowline 12 of separation vessel bottom is to communicate by valve and the service main of opening, thereby mixed liquor can not flow to service main from 12.Downward liquid flow rises liquid level, when it arrives attached wall capacitor formula liquid level bottom electrode 13, this electrode just is transported to counter CTC2 to oscillating impulse by the resistance-capacitance oscillator 14 that is electrically connected with it, and microcomputer 15 just by bus it is write down with the form of oscillation period so that required volume metering time when beginning to measure liquid level and arriving top electrodes 16 by bottom electrode 13.Along with the increase of liquid weight, the water surface that communicates with separation vessel bottom pure water bag 18 in water (post) pipe 17 also begins to rise.Sticked with glue by two half-cylindrical copper sheets 18 and the 19 a pair of adherent capacitance type liquid level electrodes that constituted on the water pipe surface, medium is in series by water column tube wall, air or water between its pole plate, if the material of tube wall is a glass, its dielectric coefficient is about 4; The dielectric coefficient of water is 81; The dielectric coefficient of air is 1.Thereby, electric capacity between pole plate is in series by tube wall-air (or water)-tube wall, according to the computing formula of series capacitance, the total capacitance in its unit length is roughly relevant with half of tube wall electric capacity because this moment air or the dielectric coefficient of water can ignore.So in the water column pipe dynamic position of the water surface be dynamic water table just to leave bottom electrode with it be that the height of initial point is directly proportional, its scale-up factor is exactly 1/2nd tube wall electric capacity.Like this, water surface site when just having arrived its bottom electrode 13 with its liquid level does to make under starting point and the control at computing machine the volume and weight metering time all when this begins time synchronisation constantly, then liquid level from the time that bottom electrode 13 arrives top electrodes 16 be exactly that the water surface is from upper time of the next arrival, that is: て _O=て _WOAt this moment, as long as the resistance-capacitance oscillator 20 that links to each other with liquid level top electrode 16 is controlled microcomputer 15(by counter CTC3 by counter CTCI) remove to write down T oscillation period that oscillating impulse that the resistance-capacitance oscillator 21 that links to each other with adherent capacitance type liquid level electrode sends is directly proportional _hAfter, difference T oscillation period that just can be when the water surface is in upper and lower water level _h-T _ORemove to calculate the difference in height h of its upper and lower water level _W, because T _h-T _OBe that the variable quantity of its plates capacitance is proportional when being in upper and lower water level with the water surface.

Structure as for attached wall capacitor formula level electrode group is asked for an interview Fig. 3～5.It is made up of a bar shaped support 22 and a pair of liquid level top electrode 13 and the bottom electrode 16 that are positioned at its two end.Every pair of electrode comprises two pole plates, and pole plate constitutes attached to the copper sheet on the substrate 25 and 26 by two symmetrical mutually organic glass substrates 23,24 with hot-press method, and copper sheet is also available to be replaced by electroplating the copper film that forms.Among Fig. 4 27,28 respectively is a copper sheet in the upper and lower electrode.The insulating gel adhesion of two substrate one ends, the other end form an opening sleeve outside the tube wall of water column pipe 17, and substrate and support stick with glue and connect.29,30 is apertures of two extraction electrodes lead-in wire, lead-in wire pass behind the aperture be bonded at support 22 on and the input end of the resistance-capacitance oscillator 31 that constitutes by chip LM556 link to each other, the 32nd, the CTC counter, it links to each other with the output terminal of oscillator.Between two pole plates of level electrode, constituted a pole capacitance device.The dielectric coefficient of medium is directly proportional between its electric capacity and pole plate.When liquid level no show electrode position, medium is air or rock gas, and dielectric coefficient is 1～1.2; During arrival, medium is an oil water mixture, and dielectric coefficient is 2～80, and is different with water cut.The utility model is to use it for the mensuration liquid level whether to have arrived electrode position.Because electric capacity is proportional to dielectric coefficient, if this level electrode electric capacity is connected in the oscillation circuit of resistance-capacitance oscillator, then the frequency of oscillating impulse will be inversely proportional to dielectric coefficient or electric capacity, and whether we can drop to certain threshold values according to the frequency of oscillating impulse is judged liquid level and whether reached electrode position.It is compared with resistance type liquidometer, is non-contact measurement, thus the problem that does not exist the crude oil in the mixed liquid of electrode to stain, thereby reliable and accurate.Experimental result, the frequency of its oscillating impulse descended 5% approximately when liquid level arrived electrode position for fluid column, and this is enough to judge for computing machine.

Experimental result shows: measure the formula continuous metering device synchronously with volume-quality and measure the error of mixed liquor liquid measure and water production rate all in ± 1～2%, the error in dipping of pure oil mass is about ± 5%, look the difference of water cut and different, better than traditional densimetry, can satisfy the oil well request for utilization.For the measured 1# mixed liquor of the utility model, mixed liquor liquid measure error is 1.2%, and the water production rate error is 1.4%, and the error in dipping of pure oil mass is 3.5%.

Claims (1)

1, the continuous metering device of oil field individual well daily oil production, by oil-gas separator, water level and liquid level measurement mechanism and microcomputer are formed, an oil-water mixture inlet tube is arranged at the top of separation vessel, the bottom of separation vessel picks out a flowline, the gas balance pipe picks out from the separation vessel top and links to each other with flowline by valve switchs such as solenoid valves, of the present utility model being characterised in that, this is the continuous metering device that a kind of volume-quality is measured formula synchronously, its height of water level measurement mechanism is relative with two and form along the adherent capacitance type liquid level electrode that pipe range sticks at tube wall surface by a water pipe, its length will be a bit larger tham the maximum vertical penetration of water level, its liquid level measurement mechanism is made up of (mixing) liquid pipe and a pair of attached wall capacitor formula level electrode that is connected to it from outer cover, and the output of these two kinds of capacitive transducers is the resistance-capacitance oscillator by separately respectively all, counter links to each other with a microcomputer with timing interrupt function.

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