Method and device of automatic detection of oil/water/gas three-phase
One, technical field
The invention belongs to the well measurement technical field, particularly relate to a kind of oil-gas-water three phase flow quantity method for automatic measurement and device by the gaging pressure differential pressure.
Two, background technology
At present, the oil well measurement method that domestic each elephant adopts mostly is still artificial separating tank mensuration, error in dipping is bigger, uses the power graph method gauging, changes complicacy greatly because of the oil well flow has intermittence, ring-type, tolerance, error is also big, effect is not fine, and for gas-liquid variation oil well greatly, a table apparatus is not suitable for measuring all oil wells, as the maturing field test satellite location tens mouthfuls of wells are arranged at most, liquid measure is at 2-200m
3/ day, tolerance is at 100-15000Nm
3/ day (pressure 0.35-1MPa), this requires a three-phase flow measuring apparatus to be suitable for accurately measuring all oil wells in the test satellite location under the situation of not changing any parts, and the three-phase flow measurement product of selling on the current market is difficult to satisfy above requirement, and some product can not well be measured the crude oil of viscosity greater than 100mPaS.
Three, summary of the invention
The purpose of this invention is to provide a kind of method and device of automatic detection of oil/water/gas three-phase, it is not thorough to have solved gas-liquid separation, the problem of energy measurement atm number oil well not, this method is used a kind of profit gas three-phase flow amount self-operated measuring unit, this device comprises filtrator, the motor operated switch T-valve, gas-liquid separator, the turnover panel liquid level gauge, static differential pressure gauge, the dynamic pressure drop meter, gas meter, liquid flowmeter, electric regulable three-way valve and flow computer, filtrator is communicated with gas-liquid separator by the motor operated switch T-valve, gas-liquid separator is provided with static differential pressure gauge and turnover panel liquid level gauge, the gas-liquid separator top respectively with gas meter, temperature sensor, pressure transducer is connected with electric regulable three-way valve, gas-liquid separator bottom respectively with liquid flowmeter, the dynamic pressure drop meter is connected with electric regulable three-way valve, the motor operated switch T-valve, the turnover panel liquid level gauge, static differential pressure gauge, the dynamic pressure drop meter, gas meter, liquid flowmeter is connected with flow computer by data line with electric regulable three-way valve, this method oil is moisture is measured as static method or dynamic method, promptly close gas circuit and open the liquid road by electric regulable three-way valve, and can emptying during liquid in the gas-liquid separator, adopt static method; Otherwise, then use dynamic method:
(1) static method: at first close gas-liquid separator top gas circuit by flow computer control electric regulable three-way valve, open gas-liquid separator bottom liquid road, liquid in the emptying gas-liquid separator, the turnover panel liquid level gauge makes zero, electric regulable three-way valve is closed the liquid road at once and is opened gas circuit, liquid level in the gas-liquid separator begins to rise, when the liquid level in the gas-liquid separator rises to the 300-2000mm of flow computer setting, flow computer is promptly controlled the motor operated switch T-valve and is closed oil inlet pipe, open motor operated switch T-valve Horizontal Exit, allow crude oil get back to the outlet of whole device by the motor operated switch T-valve, after the static 3-5 of the crude oil in the gas-liquid separator minute, flow computer reads the numerical value of turnover panel liquid level gauge and static differential pressure gauge at once, calculates mixed liquor density by following formula:
ΔP=ghρ
Wherein, Δ P is a differential pressure, and g is an acceleration of gravity, and h is a liquid level, and ρ is the mixed liquor bit density;
Again by flow computer according to the fuel-displaced moisture number percent of the density calculation of known pure oil density and water, flow computer control motor operated switch T-valve switches to gas-liquid separator to crude oil and carries out the gas-liquid flow measurement then;
(2) dynamic method: when the air content of crude oil is lower than 100Nm
3/ day, the crude stream of gas-liquid separator bottom calculates mixed liquor density through liquid flowmeter and dynamic pressure drop meter by formula Δ P=gh ρ.
Wherein, Δ P is a differential pressure, and g is an acceleration of gravity, and h is for fixed high, and ρ is the mixed liquor bit density, again by flow computer according to the fuel-displaced moisture number percent of the density calculation of known pure oil density and water.
Profit gas three-phase flow amount self-operated measuring unit is by filtrator, the motor operated switch T-valve, gas-liquid separator, the turnover panel liquid level gauge, static differential pressure gauge, the dynamic pressure drop meter, gas meter, liquid flowmeter, electric regulable three-way valve passes through pipeline, flange and valve connect to form, its middle filtrator is communicated with gas-liquid separator by the motor operated switch T-valve, gas-liquid separator is made up of 2 to 16 tubular containers, wherein each tubular container tangentially is connected with 1 isocon respectively, each tubular container is communicated with ring pipe by isocon respectively near a side at its top, ring pipe is communicated with oil inlet pipe, wherein each tubular container top center position is connected to one and is in charge of, the one end gos deep into the inner 300mm-500mm of tubular container, the other end is communicated with house steward, house steward is communicated with escape pipe, wherein each tubular container bottom is communicated with by being in charge of with drain pipe respectively, a tubular container in the gas-liquid separator is provided with static differential pressure gauge and/or turnover panel liquid level gauge, tubular container is by 3 to 10 equidistant being connected with the turnover panel liquid level gauge communicating pipe of arranging, the turnover panel liquid level gauge is provided with fluid level transmitter, the gas-liquid separator top is by pipeline and gas meter, temperature sensor, pressure transducer is connected with electric regulable three-way valve, the gas-liquid separator bottom is by pipeline and liquid flowmeter, the dynamic pressure drop meter is connected with electric regulable three-way valve, electric regulable three-way valve is by shell, spool and axle are formed, its spool is a segment shape, the motor operated switch T-valve, fluid level transmitter, static differential pressure gauge, the dynamic pressure drop meter, gas meter, liquid flowmeter is connected with flow computer by data line with electric regulable three-way valve, and this installs tolerance at 100-15000Nm
3/ day (pressure is at 0.3-2.5MPa), liquid measure is at 2-200m
3/ day all separable measurement of crude oil, the gas-liquid measuring accuracy can reach ± 1~2%, oily moisture measuring accuracy reaches ± 3%, the liquid capacity metering scope can reach 1:100, the gasmetry scope can reach 1:20, and heavy good linearity need not debugging work load, simple in structure, volume is little, and no maintenance is suitable for oil field individual well, test satellite location (Duo Koujing), the may command hyperchannel selects the well valve, and with its composition skid measurement mechanism.
Four, description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the electric regulable three-way valve front view of Fig. 1;
Fig. 3 is the electric regulable three-way valve vertical view of Fig. 1;
Fig. 4 be Fig. 1 cut out oil gas water blending agent front view;
Fig. 5 be Fig. 1 cut out oil gas water blending agent left view;
Fig. 6 is the gas-liquid separation front view of Fig. 1;
Fig. 7 is the gas-liquid separation vertical view of Fig. 1;
Fig. 8 is turnover panel liquid level gauge and the knockout drum connected component synoptic diagram of Fig. 1.
Five, embodiment
The present invention is described further below in conjunction with accompanying drawing, as shown in Figure 1, this method is used a kind of profit gas three-phase flow amount self-operated measuring unit, this device comprises filtrator 1, motor operated switch T-valve 2, gas-liquid separator 7, turnover panel liquid level gauge 8, static differential pressure gauge 6, dynamic pressure drop meter 14, gas meter 10, liquid flowmeter 9, electric regulable three-way valve 13 and flow computer 15, filtrator 1 is communicated with gas-liquid separator 7 by motor operated switch T-valve 2, a tubular container in the gas-liquid separator 7 is provided with static differential pressure gauge 6 and/or turnover panel liquid level gauge 8, tubular container is by 3 to 10 equidistant being connected with turnover panel liquid level gauge 8 communicating pipe of arranging, turnover panel liquid level gauge 8 is provided with fluid level transmitter 25, gas-liquid separator 7 tops respectively with gas meter 10, temperature sensor 11, pressure transducer 12 is connected with electric regulable three-way valve 13, gas-liquid separator 7 bottoms respectively with liquid flowmeter 9, dynamic pressure drop meter 14 is connected with electric regulable three-way valve 13, motor operated switch T-valve 2, fluid level transmitter 25, static differential pressure gauge 6, dynamic pressure drop meter 14, gas meter 10, liquid flowmeter 9 is connected with flow computer 15 by data line with electric regulable three-way valve 13, this method oil is moisture is measured as static method or dynamic method, promptly close gas circuit and open the liquid road by electric regulable three-way valve 13, and can emptying during liquid in the gas-liquid separator 7, adopt static method; Otherwise, then use dynamic method:
(1) static method: at first close gas-liquid separation 7 device top gas circuits by flow computer 15 control electric regulable three-way valves 13, open gas-liquid separator 7 bottom liquid roads, liquid in the emptying gas-liquid separator 7, turnover panel liquid level gauge 8 makes zero, electric regulable three-way valve 13 is closed the liquid road at once and is opened gas circuit, liquid level in the gas-liquid separator 7 begins to rise, when the liquid level in the gas-liquid separator 7 rises to the 300-2000mm of flow computer 15 settings, flow computer 15 is promptly controlled motor operated switch T-valve 13 and is closed oil inlet pipe 16, open motor operated switch T-valve 2 Horizontal Exits, allow crude oil get back to the outlet of whole device by motor operated switch T-valve 2, after the static 3-5 of the crude oil in the gas-liquid separator 7 minute, flow computer 15 reads the numerical value of turnover panel liquid level gauge 8 and static differential pressure gauge 6 at once, calculates mixed liquor density by following formula:
ΔP=ghρ
Wherein, Δ P is a differential pressure, and g is an acceleration of gravity, and h is a liquid level, and ρ is the mixed liquor bit density;
Again by flow computer according to the fuel-displaced moisture number percent of the density calculation of known pure oil density and water, flow computer control motor operated switch T-valve switches to gas-liquid separator to crude oil and carries out the gas-liquid flow measurement then;
(2) dynamic method: when the air content of crude oil is lower than 100Nm
3/ day, the crude stream of gas-liquid separator bottom calculates mixed liquor density through liquid flowmeter and dynamic pressure drop meter by formula Δ P=gh ρ.
Wherein, Δ P is a differential pressure, and g is an acceleration of gravity, and h is for fixed high, and ρ is the mixed liquor bit density, again by flow computer according to the fuel-displaced moisture number percent of the density calculation of known pure oil density and water.
At first, crude oil enters filtrator 1, crude oil through filtrator 1 upwards enters motor operated switch T- valve 2,2 outlets of motor operated switch T-valve have two, the one, upwards enter gas-liquid separator 7 through oil inlet pipe 16, another way outlet is through the outlet of switch valve 4 to whole device, filtrator 1 is downwards by switch valve 3, gas-liquid separator 7 is made up of 2 to 16 tubular containers, wherein each tubular container tangentially is connected with 1 isocon 27 respectively, each tubular container is communicated with ring pipe 19 by isocon 27 respectively near a side at its top, ring pipe 19 is communicated with oil inlet pipe 16, wherein each tubular container top center position is connected to one and is in charge of 26, the one end gos deep into the inner 300mm-500mm of tubular container, the other end is communicated with house steward 21, house steward 21 is communicated with escape pipe 17, wherein each tubular container bottom is communicated with drain pipe 18 by being in charge of 28 respectively, top annular pipe 19 is at first all assigned to each isocon 27 to crude oil, and be tangential level or downward oblique entering, the static differential pressure gauge 6 and the turnover panel liquid level gauge 8 of density measurement are housed respectively on the gas-liquid separator 7, gas-liquid separator 7 tops are by escape pipe 17 and pipeline and gas meter 10, temperature sensor 11 is connected with electric three passes variable valve 13 with pressure transducer 12, gas-liquid separator 7 bottoms are by pipeline and liquid flowmeter 9, dynamic pressure drop meter 14 is connected with electric regulable three-way valve 13, an outlet of electric regulable three-way valve 13 is connected with switch valve 5, switch valve 5 exports the outlet that is connected to whole device by pipeline, all the sensors, the data line of electrically operated valve all is connected with flow computer 15.
Shown in Fig. 2,3, electric regulable three-way valve 13 is made up of shell 24, spool 22 and axle 23, and its spool 22 is a segment shape, and when the spool segment was in 0 °, liquid feeding end was opened, inlet end closes, and when being between 0-90 °, oil gas is with advancing and communicating with outlet; When being in 90 °, inlet end is opened, liquid feeding end closes, slewing area 0-90 °, it below the electric regulable three-way valve 13 the liquid import, the right side is outlet, and when liquid level in the gas-liquid separator 7 was higher than the level value 1000mm that sets, spool 22 segments were gradually to 0 ° of rotation, open the liquid road until closing gas circuit to 0 °, when liquid level was lower than the level value 300mm that sets, spool 22 segments were gradually to 90 ° of rotations, until to 90 °, in liquid level remains on the liquid level range of control, spool 22 segments can be between 0 ° and 90 ° a certain position, tolerance is too little or when not having tolerance, spool 22 segments also may be at 0 °.
Shown in Fig. 4,5, the outlet of motor operated switch T-valve 2 tops links to each other with gas-liquid separator 7, lower inlet links to each other with filtrator 1, motor operated switch T-valve 2 Horizontal Exits link to each other with the outlet of whole device by switch 4, when this device when carrying out normal gas-liquid flow measurement, motor operated switch T-valve 2 lower inlet communicate with the top outlet, and Horizontal Exit is closed; When this device is in the oily saturation state of measurement, when liquid levels rise to the liquid level 1000mm that flow computer 15 sets in the gas-liquid separator 7, motor operated switch T-valve 2 lower inlet and top port closing, communicate with Horizontal Exit, this moment, switch valve 4 was normally opens, crude oil no longer enters this device, but directly get back to the outlet of whole device by bypass, liquid in the gas-liquid separator 7 remains static, when the stationary state retention time, arrival set the time (3-5 minute) of requirement, flow computer 15 control motor operated switch T-valve 2, its underpart inlet is communicated with the top outlet once more and Horizontal Exit is closed, whole device enters gas-liquid flow measurement state.
As Fig. 6, gas-liquid separator shown in 77 is made up of the 2-16 tubular container, wherein each tubular container tangentially is connected with 1 isocon 27 respectively, each tubular container is communicated with ring pipe 19 by isocon 27 respectively near a side at its top, ring pipe 19 is communicated with oil inlet pipe 16, wherein each tubular container top center position is connected to one and is in charge of 26, the one end gos deep into the inner 300mm-500mm of tubular container, the other end is communicated with house steward 21, house steward's 21 1 ends are communicated with escape pipe 17, the other end is connected with exhaust-valve 20, wherein each tubular container bottom is communicated with drain pipe 18 by being in charge of 28 respectively, top annular pipe 19 is at first all assigned to each isocon 27 to crude oil, and be tangential level or the downward oblique gas-liquid separator 7 that enters, crude oil be assigned to each tubular container separate again.