CN101576464B - Method and device for measuring density of fraction in multiunit fractional stream - Google Patents

Abstract

A method and a device are disclosed and are used for determining the density of a fraction in multiunit fractional stream passing through a pipeline. The multiunit fractional stream is divided into two flows (404), wherein, the first flow is basically provided with all streams of a first fraction. The density of the second flow is measured (406).

Description

Be used for measuring the method and apparatus of a density of fraction of polycomponent stream

Technical field

The present invention relates to the field that well yield is measured, more particularly, relate to oil flowmeter and calculate equipment.

Background technology

The G﹠O well can have the polyphasic flow that comes out from well head.Need measure the total flow of coming out from well head.In order to measure total flow, air-flow usually and liquid stream be separated, and air-flow and liquid flow point are not measured.This air-flow can adopt different Coriolis (Coriolis) flowmeter to measure with liquid stream.The liquid circulation often comprises oil and water.In order accurately to measure the oil mass in liquid stream, just must determine the water yield in liquid stream.In order to determine the water yield in liquid stream, need to determine the density of this water.Current, by the water of well head outflow periodically being sampled and utilizing picnometer to determine this density, can determine the density of water.This method has many problems.The density that problem is a water may change along with the time.If the variable density of water and use old density measurement, the calculated value of the oil mass out of true that can become in liquid stream.More serious than this out of true problem in the fluid at low-water-content in the fluid of high-moisture percentage.A method that minimizes this inexactness is that water-mass density is frequently sampled.Yet removing sample and test this density from system is an effort and time-consuming job.

Therefore, the system and method that needs oil mass in a kind of better constant current really.

Summary of the invention

Disclose a kind of method and apparatus, it is used for determining the density by a component in the polycomponent stream of pipeline.This polycomponent stream is divided into two a fluid streams, and wherein first a fluid stream has all streams of first component basically.Measure the density of second a fluid stream.

Many aspects

One aspect of the present invention comprises the method that is used for determining to flow at polycomponent a density of fraction, comprises that guiding liquids flows to pipeline, and this liquid stream is made up of at least the first material and second material, and the step of this method is characterised in that:

With the liquid flow point is first a fluid stream and second a fluid stream, and wherein the flow rate of first a fluid stream is greater than the flow rate in second a fluid stream, and wherein first a fluid stream consists essentially of the first all materials;

Measure the density of liquid in second a fluid stream.

Preferably, this method comprises that also wherein first material is oil.

Preferably, this method comprises that also wherein second material is a water.

Preferably, this method comprises that also wherein second material is bigger than first density of material.

Preferably, this method also has following feature:

The temperature of measurement flowing liquid in second a fluid stream.

Preferably, this method also has following feature:

Measure total flow by the material of this pipeline;

Part is determined the amount of first mobile in the pipeline material based on the density of liquid in second a fluid stream.Preferably, this method also comprises following feature, and gravity is used for assigning to all first materials first-class intrafascicular basically.

Another aspect of the present invention comprises the method that is used for determining to flow at polycomponent a density of fraction, and this method comprises that guiding liquids flows to into pipeline, and wherein this liquid is made up of oily at least and water, and wherein the step of this method is characterised in that:

The lasting density of separating a spot of water sample and measuring this water from flowing liquid this pipeline.

Preferably, the method is characterized in that the density of utilizing coriolis flowmeter to measure water.

Preferably, the method is characterized in that the density of continuous coverage water.

Preferably, this method also has following feature:

Part is determined oil mass mobile in pipeline based on the water-mass density that records.

Preferably, this method also has following feature:

Utilize the density of this water to determine the water percentage of liquid.

Another aspect of the present invention comprises a kind of equipment that is used for determining to flow at polycomponent a density of fraction, and this equipment has first pipeline, and this pipe configuration is to hold the liquid of being made up of at least the first material and second material, and this equipment is characterised in that:

Second pipeline is connected to first pipeline, and is configured to extract from liquid the sample of second material.

First coriolis flowmeter is connected to second pipeline, and is configured to measure the density at second ducted second material sample.

Preferably, the equipment with second pipeline also has following feature:

Separator box, it has top half and the end half one, and wherein first pipeline flows in the separator box and second pipeline is connected in the end half one of separator box.

Preferably, this equipment also has following feature:

Second coriolis flowmeter, it is connected to first pipeline, and is configured to measure the density of flowing liquid in first pipeline;

Processor, it is connected to first and second coriolis flowmeters, and is configured to part based on the density measurement that obtains from first coriolis flowmeter, determines that first material is with respect to the ratio of second material in ducted liquid.

Preferably, this apparatus characteristic is that first pipeline has first diameter and second pipeline has second diameter, and first diameter is greater than second diameter.

Preferably, this apparatus characteristic is that second diameter is less than 1/10 of first diameter.

Preferably, this apparatus characteristic is that first pipeline has first flow rate and second pipeline has second flow rate, and first flow rate is greater than second flow rate.

Another aspect of the present invention comprises a kind of equipment that is used for determining to flow at polycomponent a density of fraction, and this equipment has a pipeline, and this pipeline includes the working fluid of at least the first material and second material composition, and this equipment is characterised in that:

A kind of device is used for working fluid and is divided into first a fluid stream and second a fluid stream, and wherein the flow rate of first a fluid stream is greater than the flow rate in second a fluid stream, and wherein first a fluid stream consists essentially of the first all materials;

A kind of device is used for measuring the density at the second a fluid stream material.

Description of drawings

Fig. 1 is the synoptic diagram of the oily gentle measuring system 100 in example embodiment of the present invention.

Fig. 2 is the synoptic diagram of the branch water arm in another example embodiment of the present invention.

Fig. 3 is the synoptic diagram of the branch water arm that utilizes separator box in another example embodiment of the present invention.

Fig. 4 is a process flow diagram of determining the method for a density of fraction in the polycomponent stream in example embodiment of the present invention.

Embodiment

Fig. 1-3 and following instructions have been described concrete example, and how its instruction those skilled in the art construct and use best mode of the present invention.In order to instruct inventive principle, some traditional aspects are simplified or are omitted.Those skilled in the art will recognize that the change to these examples can fall within the scope of the present invention.Those skilled in the art will recognize that following characteristics can be differently in conjunction with to form a plurality of version of the present invention.Therefore, the invention is not restricted to following object lesson, but only by claim and their equivalents.

Fig. 1 is the synoptic diagram of the oily gentle measuring system 100 in example embodiment of the present invention.The gentle measuring system 100 of oil is connected to well head 102 and comprises: separation vessel 104, and liquid outlet tube 108, gas outlet pipe 106 divides water arm 110, flowmeter 116,114 and 112, system outlet pipe 118 and oily computing equipment 120.

Be in operation, well head 102 produces polyphasic flow, but its air inclusion, oil, water and chip, for example mud or sand.This polyphasic flow is sent in the separation vessel 104, separates in the gas from liquid therein.Separation vessel 104 can be the separation vessel of any type, comprises gas-liquid cylindrical eddy flow (GLCC) separation vessel.Gas outlet pipe 106 is discharged gas from the top of separation vessel 104.Flowmeter 112 is measured the gas that flows through gas outlet pipe 106.Flowmeter 112 can be the flowmeter of any type, comprises turbo flow meter, coriolis flowmeter etc.Liquid is removed from separation vessel 104 by liquid outlet tube 108.Flowing liquid can comprise You Heshui in liquid outlet tube 108.Divide water arm 110 to be configured to from liquid outlet tube 108, separate a spot of current.Flowmeter 114 is measured the flow of liquid in liquid outlet tube 108.In the embodiment of an example of the present invention, flowmeter 114 is coriolis flowmeters.When flowmeter 114 was coriolis flowmeter, flowmeter 114 can be used for measuring the density of liquid that flows through liquid outlet tube 108.Can utilize the fluid density and the formula 1 that record to determine in the water cut value of liquid outlet tube 108 flowing liquids.

$\mathrm{WC}=\frac{\mathrm{\ρ}\left(\mathrm{mix}\right)-\mathrm{\ρ}\left(\mathrm{oil}\right)}{\mathrm{\ρ}\left(\mathrm{water}\right)-\mathrm{\ρ}\left(\mathrm{oil}\right)}$ Formula 1

Wherein ρ (mix) is a density of liquid, and ρ (oil) is the density of oil in liquid, and ρ (water) is the density of water in liquid.The density of oil can or be measured individually by user's input.Formula 1 depends on the density of the water that flows in liquid.The density of water can be used as the function of salinity and changes.

Flowmeter 116 is measured the flow of the water in minute water arm 110.Flowmeter 116 is coriolis flowmeters.Flowmeter 116 is also measured the density of the water that flows in minute water arm 110.Can after flowmeter 114, insert once more from the liquid stream of minute water arm 110 and to turn back to (as shown in the figure) the liquid outlet tube 108, perhaps can before flowmeter 114, insert (not shown) once more.When the liquid stream from minute water arm 110 entered liquid outlet tube 108 once more before flowmeter 114, then flowmeter 116 did not need to be used for measuring flow, and its utilization can be exclusively used in the density of measurement mobile material in distributive pipe 110.Oil computing equipment 120 monitoring flowmeters 112,114 and 116 are to determine the total flow by system.In the embodiment of an example, gas and liquid output can be attached in the system outlet pipe 118 again.In the embodiment of other example of the present invention, gas and liquid can be transported to the destination of separation by the pipeline system (not shown) that separates.

Oil computing equipment 120 monitoring flow inflow-rate of water turbine meters 112,114 and 118 flow.Flowing liquid comprises the potpourri of oil and water in liquid outlet tube 108.In order to determine to flow through the oil mass of liquid outlet tube 108, must determine the amount of water.In order to determine to flow through the water yield of liquid outlet tube 108, must determine the density of water.The amount that coriolis flowmeter can be used to measure the density of the material that flows through this flowmeter and flows through the material of this flowmeter.Branch water arm 110 is configured the liquid stream of isolating essentially no oil or other hydrocarbon from liquid outlet tube 108 in the flowing liquid main flow.Liquid flow flowing can be by water in minute water arm, and sediment and other water-soluble material (for example salt) are formed.The variation of the salinity of water can change the density of water.Coriolis flowmeter 116 is used for measuring the density of flowing liquid in minute water arm 110.The density that records then is fed back in the calculating of the oil mass of being determined by the water percentage formula that flows in outlet 108.

Divide water arm 110 to construct in many ways and produce flow of liquid, it is substantially free of the oil that separates in the main flow of liquid from outlet 108 or than light liquid.In the embodiment of an example of the present invention, outlet 108 is a horizontal tube, and it has enough length with respect to flow velocity and rises to the top of outlet to allow hydrocarbon.Divide water arm 110 will be connected to the bottom of outlet 108, from outlet, only extract some than the heavy-fluid body.Branch water arm 110 can be littler than outlet 108 on diameter, thereby making to flow into divides the stream of water arm to be limited.In the embodiment of an example of the present invention, dividing water arm 110 is 1/10 of outlet 108 diameters.Only small stream or the sample than the heavy-fluid body that flows in outlet 108 need suck in the branch water arm 110.In some cases, most remaining in the outlet 108 than the heavy-fluid body flowed.

Fig. 2 is the synoptic diagram of the another kind of structure of the branch water arm in another example embodiment of the present invention.Divide the water arm to comprise separator box 222 and distributive pipe 210.Outlet 208 flows in the separator box 222.Outlet is drawn from separator box 222 at the place, top near separator box 222.Distributive pipe 210 place, the bottom of separator box 222 or near draw.Separator box has certain volume, and this volume allows liquid that certain retention time is arranged, and enough liquid of this time is in the interior laminate layer of this case.Branch water arm 210 can also be littler than outlet 208 on diameter, thereby making to flow into divides the stream of water arm 210 to be limited.Small stream or the sample than the heavy-fluid body that only flow in the separator box 222 need suck in the branch water arm 210.As a rule, major part is discharged from separator box 222 by outlet 208 than the heavy-fluid body.

Fig. 3 is another structure of the branch water arm in example embodiment of the present invention.Divide the water arm to comprise separator tube 334 and distributive pipe 310.Outlet 308 has from the extended separator tube 334 in outlet 308 bottoms.The diameter of separator tube 334 can be less than the diameter of outlet 308.Separator tube 334 extended than short distance under outlet 308 before being attached to outlet 308 again.Distributive pipe 310 is incorporated in the separator tube 334 in the bottom of separator tube 334.Only small stream or the sample than the heavy-fluid body that flows in the separator tube 334 need suck in the distributive pipe 310.Distributive pipe 310 can with separator tube 334 identical sizes, perhaps less than the size of separator tube 334.Separate small amount of sample in the multi-phase fluid that other structure can be used for flowing from outlet, with utilization the present invention.

Because changing, the sustainable measurement of density of the water that flows in polyphasic flow, the salinity in water can compensate in real time.This is with the inexactness that helps to be reduced in the measurement of water ratio.The invention is not restricted in oil and current, measure the density of water.The present invention also can apply to any mixed flow that wherein composition can be during flow separated.Divide the water arm can design from any than the heavy-fluid body than separating the light liquid.

Fig. 4 is the process flow diagram of method that is used for determining a density of fraction of polycomponent stream.In step 402, the stream that comprises at least the first material and second material is directed in the pipeline.At step 404 place, be first a fluid stream and second a fluid stream with the liquid flow point, wherein first a fluid stream consists essentially of the first all materials.At step 406 place, measure density of liquid in second a fluid stream.

Claims (12)

1. a method that is used for determining to flow at polycomponent a density of fraction comprises that guiding liquids flows to into pipeline, and wherein this liquid is made up of oily at least and water, and the step of this method is characterised in that:

The lasting density of separating a spot of water sample and measuring this water from flowing liquid this pipeline.

2. the method for claim 1 is characterized in that utilizing coriolis flowmeter to measure the density of water.

3. the method for claim 1 is characterized in that measuring continuously the density of water.

4. the method for claim 1, its feature also is:

Part is determined oil mass mobile in pipeline based on the water-mass density that records.

5. the method for claim 1, its feature also is:

Utilize the density of this water to determine the water percentage of this liquid.

6. one kind is used for determining that this equipment has first pipeline (108) at the equipment of a density of fraction of polycomponent stream, and this pipeline is constructed to hold the liquid of being made up of at least the first material and second material, and this equipment is characterised in that:

Second pipeline (110), it is connected to first pipeline (108), and be configured to extract from flowing liquid in first pipeline (108) sample of second material, wherein the density of second material is different from the density of first material, and second material is insoluble to first material basically;

First coriolis flowmeter (116), it is connected to second pipeline (110), and is configured to measure the density of second material sample in second pipeline (110).

7. equipment as claimed in claim 6, wherein second pipeline also has following feature:

Separator box (222), it has top half and the end half one, and wherein first pipeline (208) flows in the separator box (222) and second pipeline (210) is connected in the end half one of separator box.

8. equipment as claimed in claim 6 is characterized in that:

Second coriolis flowmeter (114), it is connected to first pipeline (110), and is configured to measure the density of flowing liquid in first pipeline;

Processor (120), it is connected to first and second coriolis flowmeters, and is configured to part based on the density measurement that obtains from first coriolis flowmeter, determines that first material is with respect to the ratio of second material in ducted liquid.

9. equipment as claimed in claim 6 is characterized in that, first pipeline has first diameter and second pipeline has second diameter, and first diameter is greater than second diameter.

10. equipment as claimed in claim 9 also has following feature: second diameter is less than 1/10 of first diameter.

11. equipment as claimed in claim 6 is characterized in that, first pipeline has first flow rate and second pipeline has second flow rate, and first flow rate is greater than second flow rate.

12. equipment as claimed in claim 6 is characterized in that: described polycomponent flow to and comprises You Heshui less, and second pipeline (110) is configured to extract water sample from first pipeline (108).

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