CN2293799Y

CN2293799Y - Oil, gas & water three-phase flowmeter

Info

Publication number: CN2293799Y
Application number: CN 96236320
Authority: CN
Inventors: 周芳德
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 1996-10-09
Filing date: 1996-10-09
Publication date: 1998-10-07
Anticipated expiration: 2006-10-09

Abstract

The utility model relates to an oil, gas and water three-phase flowmeter, which comprises a venturi tube, a transducer, and a signal acquisition processor. A vertically arranged sample pipe is connected with a main pipe via an inverted U-shaped tube, and both sides of the measuring sections of the U-shaped tube, the sample pipe and the venturi tube are respectively provided with a non-contact type pressure difference transducer. Each transducer is connected with a computer via an analog to digital converter. The double venturi tubes are placed horizontally. The temperature transducer and the pressure transducer are respectively arranged in the horizontal main pipe, and the inner part of the main pipe is provided with a valve. The utility model has the advantages of high measurement precision, measuring reliability and stability, and can be used for measuring water and any other gas and liquid two-phase and polyphase flow.

Description

The oil-gas-water three phase flow quantity instrument

The utility model belongs to field of measuring technique, further relates to a kind of crude oil of using, rock gas, the measurement mechanism of any other two-phase or multiphase flow of gas-liquid in water three-phase flow and chemical industry, the power engineering.

The method of measuring two-phase or multiphase flow employing at present mostly is partition method, earlier with gas and fluid separation applications, measure with single-phase flowmeter respectively again, for crude oil, rock gas, water three-phase flow metering, the external cooling commercial measurement phase ratio that adopts is mostly measured total volumetric flow rate with positive displacement or restricting element.The oil-gas-water three phase flow quantity instrument of producing as the European energy project company of Britain.Structure is very complicated, measure liquid G﹠O water ratio with two cover r-radiographic density instrument, the gross weight of equipment amount reaches 10 tons, price reaches millions of units, the Development Prototype that similarly also has U.S. Texco oil company, also adopt the r-radiographic density, the greatest problem that this measuring method exists is the precision instrument, costs an arm and a leg.Also there is the employing microwave technology other oil company, electric capacity, electricity is led and is measured ow ratio, these methods and multiphase flow pattern have substantial connection, often be applicable to this a kind of flow pattern, just be not suitable for other flow pattern, " multiphase flow measurement research situation " international petroleum Engineering society technology annual meeting in 1994, SPE28515." production of hydrocarbons and transport in heterogeneous Science and Technology " Conoco engineering conference, the U.S. Tours Sa SPE27958 of university, 1994.

The utility model purpose provides a kind of oil gas water reliable, stable, that measuring accuracy is high and cost is low and measurement mechanism of other any gas-liquid two-phase and multiphase flow rates measured.

The utility model comprises Venturi tube, sampling pipe, sensor, signal acquisition process device.Vertically disposed sampling pipe links to each other with trunk line through the inverted U pipe.U type pipe measuring section both sides, sampling pipe, Venturi tube are equipped with contactless pressure difference transducer respectively, and each sensor all connects computing machine behind A/D converter.Horizontal positioned in two Venturis, temperature sensor, pressure transducer are loaded on respectively in the horizontal trunk line, are provided with valve in the trunk line.

The utility model will be further described below in conjunction with accompanying drawing.

Fig. 1 is an one-piece construction synoptic diagram of the present utility model.

The trunk line 1 that links to each other with oil well in the utility model links to each other with two Venturi tube 2 levels, and Venturi tube becomes current signal through pressure transducer 11 with the pressure differential signal.Vertical sampling pipeline 3 links to each other with trunk line 1 through three-way connection.The length of vertical sampling pipeline 3 is 1.2 meters, and pressure tap 5 is not more than 0.6 meter apart from trunk line.The bottom of vertical sampling pipeline 3 has a U type pipe 17 to link to each other with main channel 1, and a sampling section Horizontal Exit 17 links to each other with trunk line, and its position is higher than pressure tap 5 about 0.3 meter.Temperature sensor 13, pressure transducer 12 is loaded on respectively in the horizontal trunk line 1, temperature point 6 does not communicate with trunk line 1, is one 6 * 1.5 sealing pipe, and pressure-measuring-point 7 is the pressure transducer mounting hole, the equidistant pressure tap 8,10 that has in inverted U pipe 9 both sides links to each other with pressure difference transducer 11.Valve 4 is that shutoff valve is between the import and outlet of vertical sampling section on the main channel 1.Data acquisition system (DAS) 14 is that 12 40KHZA/D collection plates link to each other with sensor 11,12,13, and computing machine 15 links to each other with data acquisition system (DAS) 14.Printer 16 links to each other with computing machine 15.The head of non-contacting sensor is a flange-type structure, and is provided with a thin alloy diaphragm between the three-phase fluid medium, is full of silicone oil in the sensor.

The oil gas water three phase fluid enters trunk line 1, at first enters double-venturi tube 2, and preposition Venturi tube mixes three-phase fluid as mixer, and second Venturi tube is used for measuring the three-phase fluid total volumetric flow rate.Temperature sensor 6, pressure transducer 7 is measuring fluid pressure and temperature respectively, are used for gas flow under the basis of calculation state.Vertical sampling section 3 is used for measuring ow ratio, and measuring section 3 links to each other with main channel 1 with 17, but serial sampling and gas isolated.Oil water mixture flowing velocity in sampling section 3 is slow, less than 5 mm/second, has both prevented that gas from sneaking into, and can constantly change sampled fluid again.Ow ratio is measured by pressure differential method, measures pressure reduction by pressure tap 5, sensor 11, just can obtain ow ratio.Sampling section 9 is used for measuring gas liquid ratio, measures pressure reduction by the differential pressure pickup 11 that is loaded on pressure tap 8,10, just can obtain gas liquid ratio.All the sensors 11,12,13 all links to each other with data acquisition system (DAS) 14.And and computing machine 15, printer 16 link into an integrated entity, computing machine 15 will collect data and calculate, and by printer 16 output results.

The utility model adopts double-venturi tube to measure oil-gas-water three phase flow quantity, has the accuracy height, measures stable characteristics.Preposition Venturi tube evenly mixes gas and liquid feed as mixer.

Vertical sampling section

3 and 17 is used for measuring ow ratio, and this method can be used to measure oil/water ratio of 0-100%, and the not influence of flow-changeable and oil-water emulsion.Inverted U pipe 9 is used for measuring gas liquid ratio, compares with other method to have the accuracy of measurement height, and measuring repeatability is good, can measure gas liquid ratio 0-99.6%, and almost gas liquid ratio all can be measured arbitrarily.Characteristics simple in structure, that measurement is highly sensitive are arranged again simultaneously.

Claims

1, oil-gas-water three phase flow quantity instrument, it comprises Venturi tube, sampling pipe, sensor, signal acquisition process device, it is characterized in that: described sampling pipe vertically is provided with, it links to each other with trunk line by the inverted U pipe, U type pipe measuring section both sides, sampling pipe, Venturi tube are equipped with contactless pressure difference transducer respectively, and each sensor all connects computing machine behind A/D converter; Two Venturi horizontal positioned, temperature sensor, pressure transducer are loaded on respectively in the horizontal trunk line, are provided with valve in the trunk line.

2, oil-gas-water three phase flow quantity instrument according to claim 1 is characterized in that: described inverted U pipe both sides side pressure point is not more than 0.6 meter.

3, oil-gas-water three phase flow quantity instrument according to claim 1 is characterized in that: the head of described non-contacting sensor is flange-type structure, is provided with a thin alloy diaphragm between sensor head and the three-phase fluid medium, is full of silicone oil in the sensor.