CN2143766Y - Metric separator for crude oil containing high water and sand - Google Patents

Abstract

The utility model relates to a metric separator for crude oil containing high water and sand, which is suitable for the oil production metering and production management of an oil well. The utility model comprises a standard separation device, an air pressure sensor, a differential pressure sensor, a temperature sensor, an oil and water interface sensor, and a liquid level sensor. The utility model is characterized in that a standard capacity container connected with an oil outlet, a standard industrial control interface and a central control computer are arranged. In the control interface, the adapter module of each sensor and an oil-water metering valve for controlling the adapter module are inserted. Because an electromechanical integration form is adopted, timing can be carried out to the full-filling standard capacity container, the utility model can have very high metering accuracy, and correction is carried out to each error of each sensor by using a software method, with a circuit structure simplified.

Description

Metric separator for crude oil containing high water and sand

A kind of crude oil measuring separator that is used for, it is applicable to the management of doing oilfield produce oil parameter metrology and measurement and oil well production etc., is specially adapted to the high-moisture in China oil field and oil oil, gas, the test of water three-phase separator measurement of high sand amount.

Now the oil, gas, the moisture device that use of oil field adopts the iris type separation method more, uses the electromechanical instrument to the separation oil and gas interface with oil-water interface is monitored and oil offtake and water discharge are measured.In use, because sand cut is higher in the oil well input liquid,, just can not re-use after the consequently very short time being used for the movable part serious wear such as turbine of water discharge measuring instrument.Simultaneously, because the water cut in the oil well input liquid is very high, the oil offtake of oil is lower, and metering all has certain working range with instrument, when flow is lower than certain value, and the friction effect in the measuring instrument, can influence measuring accuracy greatly, particularly when the viscosity of oil was big, influence was just bigger, made the oil offtake metering extremely inaccurate.On the other hand, now monitoring and the measuring instrument that adopts all is the electromechanical instrument, and they add that by various physical sensors amplification, demonstration and error correction and control circuit form.Because of each sensor all exists non-linear, sensitivity and drift equal error, therefore needing increases various error compensation correcting circuits, and will increase a large amount of artificial adjustment staking-out works, makes the complex structure of whole device, and cost increases.

The purpose of this utility model is a kind of oil gas water three phase separate measurement separation vessel that is applicable to high-moisture and high sand cut of invention, and higher measuring accuracy can be arranged, and uses electromechanical integration technology, is combined as a whole measuring with control, and is simple in structure.

Structure of the present utility model as shown in Figure 1, it has separator flask 1, dividing plate 2, outlet valve 3, oil-out valve 4, gas filter screen 6, gas discharge capacity differential manometer metered valve 7 is arranged in outlet pipe, gas pressure sensor 8, differential pressure pickup 9, temperature sensor 10, at separator flask 1 standard industrial control 13 is arranged nearby, central control computer 14, at the oil-water interface place oil-water interface sensor 11 is housed, level sensor 12 also is housed in container 1, it is characterized in that: below separator flask 1, also have normal capacity container 5, normal capacity container 5 links to each other with the oil drain out of separator flask 1 and oil-out valve 4 is connected with the bottom of normal capacity container 5, there is a tubule 15 to link to each other with the top of separator flask 1 on normal capacity container 5 tops, in tubule 15 bottoms pressure transducer 16 is housed, standard industrial control 13 links to each other with central control computer 14 by the standard serial communication interface, central control computer 14 can be total with other control and measuring equipment, in standard industrial control 13, be inserted with respectively and sensor 8,9,10,11,12 measurement adaptation module that link to each other with 16 and the control adapter module that links to each other with 4 with valve 3, outlet valve 3 and oil-out valve 4 are digital controlled metrological valve.

Accompanying drawing 1 is a structural representation of the present utility model.

Oil and gas and water of the present utility model is the same with the separation principle of conventional separator from principle, by an end feed liquor of separator flask 1, utilizes between them the difference of proportion to separate.The effect of dividing plate 2 is that the profit that keeps having separated no longer mixes and the profit that arrives fluid, gas port has enough residence time.When carrying out the metering of high-moisture oil well, under the control of central control computer 14, open the digital controlled metrological valve 4 of oil-out, the crude oil in the normal capacity container 5 is discharged.After the crude oil emptying in the normal capacity container 5, the digital controlled metrological valve 4 of control oil-out is closed.Simultaneously, central control computer 14 picks up counting, and constantly measures the flow and the aperture of control water delivering orifice digital controlled metrological valve 3, and flow is carried out integration, and the control aperture is to keep the oil-water interface position.Central control computer 14 is also constantly measured the data of exhaust gas temperature sensor 10, gas pressure sensor 8, differential pressure pickup 9 and pressure transducer 16 at the same time respectively, data by sensor 8,9 and 10 can calculate gas flow, and to its integration.Compare by the value of pressure transducer 16 and the value of gas pressure sensor 8, just can whether fill by criterion capacity container 5.Normal capacity container 5 less than the time, pressure transducer 16 and 8 value are owing to the connection of tubule 15 equates (not considering because the gas column pressure that the discrepancy in elevation produces), and after normal capacity container 5 is expired, pasta is behind tubule rising overpressure sensor 16, the pressure of pressure transducer 16 is owing to the effect of oil column weight on its position increases a value, and is unequal with the pressure of pressure transducer 8.Record the value of value greater than pressure transducer 8 of pressure transducer 16 at central control computer 14 after, stop to calculate the integration of the integration of drain discharge and extraction flow and stop the computing machine timing.Owing to the capacity of normal capacity container 5 is known in advance, thereby can calculate oil offtake, water discharge and air capacity in the unit interval, thereby reach the purpose of metering.The height of oil offtake only influences the time of carrying out integration, and irrelevant with the measuring apparatus of oil-out, can obtain very high measuring accuracy.

In the utility model, outlet valve 3 adopts the data metering valve, can be to be the valve of CN91218716 as number of patent application, moving component when it does not measure, as the common logical valve that ends, thereby can reduce greatly to be applicable to metering to high sand cut oil well owing to the wearing and tearing of high sand cut in the draining to it.The digital control meter valve that oil-out valve 4 among the present invention adopts can be the form identical with water delivering orifice digital control meter valve 3.For the not high oil well of water percentage, can allow central control computer 14 control criterion Containers 5 when expiring oil condition, its flow is opened and measured to control oil-out digital controlled metrological valve 4, reaches the purpose of metering.

In the utility model, all sensors all are a simple measuring sensor, are a thermal sensing element as temperature sensor 10, and pressure differential pressure sensor 8,9 or 16 is a pressure-active element etc.All physical quantity signals are handled all and are finished by the adaptation module and the central control computer 14 that insert in the standard industrial control (being called for short RTU) 13, have used the electromechanical integrated structure of standard.Under the control of central control computer 14, when needs detect delivery temperature, earlier send address gating signal to RTU13 by the standard serial communication interface, corresponding temperature sensor 10 adaptation module of RTU13 gating, the adaptation module by temperature sensor 10 sends back to central control computer 14 to the value that temperature sensor 10 records after the A/D conversion.Other measured value is also gathered with same procedure.To each valve, when the aperture of outlet valve 3 is adjusted, central control computer 14 sends address gating signal by serial ports, adaptation module by RTU13 gating outlet valve 3, and then the process serial ports sends the opening data, through the D/A conversion of adaptation module, be converted to 3 actions of analog signals rear drive valve.Gas discharge capacity differential manometer metered valve 7 is orifice valves, its aperture is known, and the measurement of gas delivery flow is by central control computer 14 difference gating pressure and differential pressure pickup and temperature sensors, obtain their value, obtain the gas outlet flow by Computer Processing.The measurement of 14 pairs of all systematic parameters of central control computer can be used the mode of scanning, constantly carries out in turn, to obtain the real-time system parameter, each valve is carried out real time measure and control.

In the utility model, various sensors link to each other with corresponding adaptation module by electric wire, do not use the form of traditional instrument and meter for automation.Sent into computing machine by the electric signal that sensor directly obtains by the adaptation module Direct Digitalization, and non-linear, the sensitivity of various sensors and drift error are carried out digital operation by computing machine and are proofreaied and correct, do not use correction control circuit, and the adjustment of each sensor is demarcated and is also finished automatically by computing machine, and various correction data are deposited in computing machine.This had both simplified circuit structure, reduced cost, and had also reduced the workload of artificial adjustment, had improved measuring accuracy.Simultaneously, have only sensor to be loaded on the separator flask, and other circuit all is loaded in the RTU case, not affected by environment, be adapted to various rugged surroundings.

In the utility model, pressure transducer 16 can be changed to differential pressure pickup, and the two ends of differential pressure pickup are connected on tubule 15 bottoms and separator flask 1 top respectively.When this differential pressure pickup is output as zero, 5 underfills of expression normal capacity container, and non-vanishing when the output of this differential pressure pickup, represent that then normal capacity container 5 has been full of.Only just can obtain the state of normal capacity container 5 with the output valve of a sensor.

In the utility model, RTU13 can use the controller of the LC4 of U.S. OPTO22 company.RTU13 of the present utility model can adopt that to pack into as the patent No. be in the casing of " airtight box structure of standard industrial control medium surface " of CN89214959, and isolated fully external environment is to the influence of RTU and each adaptation module.In the utility model, outlet valve 3, oil-out valve 4 can be designed metering valve among the CN91218716 " a kind of electromechanical integrated digital controlled metrological valve device " as number of patent application, also can use common controllable valve to add flow measurement device.In the utility model, stream interface sensor 12 can use as the survey sensor of the patent No. as CN90200023 " a kind of specific gravity measuring unit of liquid level ", it is made up of two pipe and pressure, differential pressure pickups by the certain-length difference, this sensor measurement precision height is adapted to the requirement of electromechanical integration.Also can with other as photoelectricity, float liquid level sensor.Oil-water interface sensor 11 in the utility model can use photoelectric sensor, utilizes oil different with the transmittance of water, comes the measuring position by the output difference of photo-sensitive cell on the diverse location.Also can use capacitive transducer, because the specific inductive capacity difference of oil and water is very big, thereby there are different electric capacitys different interface positions.Because the oil-water interface position does not influence the separating property of oil gas water, measuring accuracy can be very high.

Central control computer 14 in the utility model can use industrial control computer, also can use PC, can also adopt the PCS-1 universal process Control work station as U.S. ME company (MECHATRONIC EQUIPMENT INC.).The very strong PARAGON500 universal process software of function is housed in this workstation, can programmes and use mutual input mode input control to require and strategy, automatically the generating run program.

In the utility model, standard industrial control 13 also can be selected the I/O 32 of U.S. ME company (MECHA-TRONIC EQUIPMENT INC.) for use, or the PB16AH of U.S. OPTO 22 companies.Measure AD3 or similar A/D modular converter that adaptation module can adopt OPTO 22 companies.Control adapter module can be selected the DF3 or the similar D/A modular converter of OPTO 22 companies for use.

Claims (1)

1, a kind of crude oil measuring separator that is used for, it has separator flask (1), dividing plate (2), outlet valve (3), oil-out valve (4), gas filter screen (6), gas discharge capacity differential manometer metered valve (7) is arranged in outlet pipe, gas pressure sensor (8), differential pressure pickup (9), temperature sensor (10), at separator flask (1) standard industrial control (13) is arranged nearby, central control computer (14), oil-water interface sensor (11) is housed at the oil-water interface place, level sensor (12) also is housed in container (1), it is characterized in that: below separator flask (1), also have normal capacity container (5), normal capacity container (5) links to each other with the oil drain out of separator flask (1) and oil-out valve (4) is connected with the bottom of normal capacity container (5), there is a tubule (15) to link to each other on normal capacity container (5) top with the top of separator flask (1), in tubule (15) bottom pressure transducer (16) is housed, standard industrial control (13) links to each other with central control computer (14) by the standard serial communication interface, central control computer (14) can be total with other control and measuring equipment, in standard industrial control (13), be inserted with respectively and sensor (8), (9), (10), (11), (12) measurement adaptation module that links to each other with (16) and the control adapter module that links to each other with (4) with valve (3), outlet valve (3) and oil-out valve (4) are digital controlled metrological valve.

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