CN111058831B - Automatic metering system device and method for single thickened oil well - Google Patents
Automatic metering system device and method for single thickened oil well Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000003129 oil well Substances 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 6
- 238000000605 extraction Methods 0.000 claims abstract description 3
- 230000005514 two-phase flow Effects 0.000 claims description 18
- 238000011144 upstream manufacturing Methods 0.000 claims description 18
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- 239000003921 oil Substances 0.000 abstract description 37
- 238000005259 measurement Methods 0.000 abstract description 21
- 238000011161 development Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000295 fuel oil Substances 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 5
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- 238000010079 rubber tapping Methods 0.000 description 20
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- 238000005070 sampling Methods 0.000 description 4
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention discloses a single well automatic metering system device and a method for thickened oil, and relates to the technical field of oil-water two-phase fluid measurement. Insert differential pressure production and extraction device on the trunk line, including sealing connection's outer tube and inner tube set up the swirler that is used for producing the differential pressure in the inner tube, the side of swirler is connected with differential pressure transmitter, and capacitanc electromagnetic flowmeter is still installed in the low reaches of trunk line. Under the rotational flow effect generated by the rotational flow sheet, the axial-symmetry phase distribution is not only beneficial to the measurement of the electromagnetic flowmeter, but also enables dispersed oil drops to be concentrated at the center of the pipeline, and the characteristic of oil viscosity is enhanced, so that the concentrated oil can also enable the pressure difference between the front and the back of the rotational flow sheet to generate obvious change even under high water content, and the measurement is guaranteed to have higher precision. The invention can simultaneously and continuously measure the flow and the water content of each phase of oil and water in the produced liquid of the oil well on line, has high measurement precision and low cost, and can improve the overall economic benefit and the automation degree of the thermal recovery development of the heavy oil field.
Description
Technical Field
The invention relates to the technical field of oil-water two-phase fluid measurement, in particular to a thickened oil single-well automatic metering system device and a method.
Background
In the process of oil exploitation, the real-time online measurement of the flow rate of oil, the flow rate of water and the water content in produced liquid has important practical significance for predicting the yield of an oil well, mastering the dynamic information of the produced liquid, correcting an injection and production scheme of the oil field and realizing the digital and intelligent management of the oil field.
In the process of thick oil thermal recovery development, the produced fluid is mostly oil-water two-phase flow or oil-gas-water three-phase flow, and the measurement belongs to the multiphase flow measurement category. Because each phase of multiphase flow has physical property difference, the flowing of the multiphase flow generates slippage phenomenon, each phase has flow velocity difference, the flow pattern is various, and the flowing mechanism is complex, so that the multiphase flow is difficult to accurately measure.
The existing oil-water two-phase flow measuring method mainly comprises two types: one is a separation method, and the other is an online measurement method by adopting a multiphase flowmeter. The separation method is usually to separate oil, gas and water by using a large separation tank and then measure the separated oil, gas and water by using a single-phase flowmeter, such as patent CN101025080A, but the method has the disadvantages of huge equipment, high input cost and poor real-time property. Therefore, the multiphase flowmeter has attracted much attention and research because of its advantages of online measurement, compact structure, and suitability for wellhead installation. However, the existing multiphase flowmeter generally has the defects of low measurement accuracy and small measurement range. Patent CN109856175A discloses a method for measuring parameters of a nuclear magnetic resonance oil-water two-phase flow, which can obtain a high measurement precision, but the cost is high, and it is difficult to popularize in oil field enterprises. At present, land oil fields are mostly in the middle and later development stages, the water content is up to more than 80%, and the traditional capacitance method and the electric conduction method cannot meet the measurement of the water content with high water content.
Therefore, aiming at the current situation and difficulty of measuring the flow and the water content of the oil-water two-phase flow in the oil field, the technical personnel in the field are dedicated to developing the continuous online measuring device and the method for the oil-water two-phase flow, which have high measuring precision and low cost and are suitable for measuring the high water content, so that the overall economic benefit and the automation degree of the thermal recovery development of the heavy oil field are improved.
Disclosure of Invention
In view of the above defects in the prior art, the invention aims to solve the technical problem of developing an oil-water two-phase flow continuous online metering device and method which have high measurement accuracy and low cost and are suitable for high water content measurement, thereby improving the overall economic benefit and the automation degree of the thermal recovery development of the heavy oil field.
In order to achieve the purpose, the invention firstly provides a thickened oil single-well automatic metering system device which comprises an upstream main pipeline, a differential pressure generating and leading-out device and a downstream main pipeline, wherein the upstream main pipeline, the differential pressure generating and leading-out device and the downstream main pipeline have the same inner diameter and are sequentially and hermetically connected; the differential pressure generating and leading-out device comprises an outer pipe and an inner pipe; the outer surface of the inner pipe is hermetically connected with the inner surface of the outer pipe; a swirler used for generating differential pressure is arranged in the inner pipe; the cyclone comprises a central pressure taking column, and the central pressure taking column is of a hollow columnar structure and is positioned in the center of the cyclone; one end of the central pressure taking column is connected with a caudal vertebra, the other end of the central pressure taking column is connected with a group of radial pressure taking columns, each radial pressure taking column comprises four hollow columns positioned on the same cross section, and the inside of each radial pressure taking column is communicated with the inside of the central pressure taking column; the side surface of the central pressure taking column is also provided with at least one group of spinning disks; the differential pressure generating and leading-out device is connected with a radial differential pressure transmitter and an axial differential pressure transmitter which are respectively used for outputting radial differential pressure generated by the center and the wall surface of the same cross section and axial differential pressure generated by the front and rear cross sections of the swirler; and a capacitance type electromagnetic flowmeter is installed on the downstream main pipeline.
Preferably, the axial distance between the capacitive electromagnetic flowmeter and the tail end of the swirler is 2-6 pipe diameters.
Preferably, the inner pipe comprises three inner pipe pressure taking point sets, each inner pipe pressure taking point set comprises four small holes uniformly distributed along the circumferential direction of the inner pipe, and the first inner pipe pressure taking point set is positioned at the upstream of the cyclone and arranged on the wall surface of the inner pipe; a second inner tube pressure sampling point set is arranged on the central pressure sampling column; a third inner tube pressure taking point set is positioned at the downstream of the swirler and arranged on the wall surface of the inner tube; the pressure point set is got to the second inner tube with the pressure point set is got to the third inner tube is located same circulation cross-section department, circulation cross-section is located at the ascending position of axial the terminal upper reaches of spinning disk.
More preferably, the outer tube is provided with a pressure measuring hole, the inner tube is provided with a pressure measuring groove, and the pressure measuring groove is communicated with the pressure measuring hole and a pressure measuring point of fluid in the inner tube to form a pressure measuring chamber.
Further preferably, the outer wall surface of the inner tube is provided with three pressure taking grooves, namely a first pressure taking groove, a second pressure taking groove and a third pressure taking groove in sequence from upstream to downstream; the first pressure taking groove is communicated with the first inner pipe pressure taking point set; the second pressure taking groove is intersected with the radial pressure taking column to form four communicating holes, and the second pressure taking groove is communicated with the second inner pipe pressure taking point set through the radial pressure taking column and the central pressure taking column; and the third pressure taking groove is communicated with the third inner pipe pressure taking point set.
Still further preferably, the outer tube is provided with three pressure taking holes, namely a first pressure taking hole, a second pressure taking hole and a third pressure taking hole from upstream to downstream; the first pressure taking hole is communicated with the first pressure taking groove to form a first pressure taking chamber; the second pressure taking hole is communicated with the second pressure taking groove to form a second pressure taking chamber; the third pressure measuring hole is communicated with the third pressure measuring groove to form a third pressure measuring chamber; the three pressure taking chambers are sealed and isolated on the outer surface of the inner pipe and the inner surface of the outer pipe by adopting a sealing means.
Still further preferably, the radial differential pressure transmitter is connected with the second pressure tapping hole and the third pressure tapping hole and is used for measuring the radial differential pressure generated by the center and the wall surface of the rotational flow on the same cross section; and the axial differential pressure transmitter is connected with the second pressure taking hole and the first pressure taking hole and is used for measuring the axial differential pressure generated at the front and rear sections of the swirler.
Preferably, four inner tube sealing grooves are arranged on the outer wall surface of the inner tube, and at least one inner tube O-ring is arranged in each inner tube sealing groove and used for respectively sealing the first pressure taking chamber, the second pressure taking chamber and the third pressure taking chamber.
Preferably, the caudal vertebra is detachably connected with the central pressure taking column; the caudal vertebra comprises a caudal vertebra sealing groove, a caudal vertebra O-shaped ring is arranged in the caudal vertebra sealing groove, and is used for sealing between the caudal vertebra and the central pressure tapping column.
The invention also discloses an oil-water two-phase flow measuring method of the automatic metering system device of the single well of the thickened oil, which comprises the following steps:
step 1, after the oil-water two-phase flow flows through the cyclone, the radial differential pressure transmitter outputs a radial differential pressure delta P generated by the center and the wall surface on the same cross section under the cyclone effectrThe axial differential pressure transmitter outputs rotational flowAxial differential pressure delta P generated at front and rear sections of the devicez；
in the formula, a, b, c and d are constants and are obtained by calibration through experiments; rhoOAnd ρWDensity of oil and water, respectively;
and 4, determining respective flow values of oil and water phases according to the following formula:
QO＝Q(1-β) (2)
QW＝Qβ (3)
in the formula QOFlow rate of oil, QWIs the flow rate of water.
The invention discloses a thick oil single well automatic metering system device and a method, wherein a differential pressure generating and leading-out device is connected to a main pipeline, the thick oil single well automatic metering system device comprises an outer pipe and an inner pipe which are in sealed connection, a swirler used for generating differential pressure is arranged in the inner pipe, and a differential pressure transmitter is connected to the side surface of the swirler and comprises a radial differential pressure transmitter and an axial differential pressure transmitter. And a capacitance type electromagnetic flowmeter is also arranged at the downstream of the main pipeline. Under the rotational flow effect generated by the rotational flow sheet, the axial-symmetry phase distribution is not only beneficial to the measurement of the electromagnetic flowmeter, but also enables dispersed oil drops to be concentrated at the center of the pipeline, and the characteristic of oil viscosity is enhanced, so that the concentrated oil can also enable the pressure difference between the front and the back of the rotational flow sheet to generate obvious change even under high water content, and the measurement is guaranteed to have higher precision. The invention can simultaneously and continuously measure the flow and the water content of each phase of oil and water in the produced liquid of the oil well on line, has high measurement precision and low cost, and can improve the overall economic benefit and the automation degree of the thermal recovery development of the heavy oil field.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic structural diagram of an automatic metering system for a single thick oil well according to a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view of a differential pressure generating and extracting apparatus in accordance with a preferred embodiment of the present invention;
FIG. 3 is a cross-sectional view of the inner tube in a preferred embodiment of the invention;
FIG. 4 is a perspective view of an inner tube in accordance with a preferred embodiment of the present invention;
FIG. 5 is a perspective view of an outer tube in a preferred embodiment of the invention;
FIG. 6 is a schematic view of an inner tube with an O-ring fitted therein in accordance with a preferred embodiment of the present invention;
FIG. 7 is a schematic view of a caudal vertebra with a caudal O-ring of a preferred embodiment of the invention.
The pressure measuring device comprises an upstream main pipeline 1, a differential pressure generating and leading-out device 2, a downstream main pipeline 3, a radial differential pressure transmitter 4, an axial differential pressure transmitter 5, a capacitance type electromagnetic flowmeter 6, an outer pipe 21, an inner pipe 22, an inner pipe 211, a first pressure taking hole 212, a second pressure taking hole 213, a third pressure taking hole 221, a cyclone 222, an inner pipe sealing groove 225, an inner pipe O-shaped ring 227, a communication hole 2211, a central pressure taking column 2212, a tail cone 2213, a cyclone sheet 2214, a radial pressure taking column 2231, a first pressure taking groove 2232, a second pressure taking groove 2233, a third pressure taking groove 2241, a first inner pipe pressure taking point set 2242, a second inner pipe pressure taking point set 2243, a third inner pipe pressure taking point set 2261, a first pressure taking chamber 2262, a second pressure taking chamber 2263, a third pressure taking chamber 22121, a tail cone 22122 and a tail cone sealing groove O.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
The invention provides a thick oil single well automatic metering system device, which comprises an upstream main pipeline 1 and a downstream main pipeline 3, wherein a differential pressure generating and leading-out device 2 is connected between the two main pipelines, a radial differential pressure transmitter 4 and an axial differential pressure transmitter 5 are respectively connected with three pressure taking holes on the side surface of the differential pressure generating and leading-out device 2, and the pressure taking holes are a first outer pipe pressure taking hole 211, a second outer pipe pressure taking hole 212 and a third outer pipe pressure taking hole 213 from upstream to downstream in sequence. The radial differential pressure transmitter 4 is connected with a second outer pipe pressure taking hole 212 and a third outer pipe pressure taking hole 213, and is used for measuring the radial differential pressure generated by the center and the wall surface of the rotational flow on the same cross section; and the axial differential pressure transmitter 5 is connected with the second outer pipe pressure taking hole 212 and the first outer pipe pressure taking hole 211 and is used for measuring the axial differential pressure generated at the front and rear sections of the cyclone 221. And a capacitance type electromagnetic flowmeter 6 is connected to the downstream main pipeline 3. Wherein, the differential pressure generation and the leading-out device 2 are the same as the inner diameters of the upstream main pipeline 1 and the downstream main pipeline 3 and are connected in a sealing way.
The specific structure of the differential pressure generation and extraction device 2, as shown in fig. 2, includes an outer tube 21 and an inner tube 22, and three pressure measurement holes are opened on the outer tube 21; the outer surface of the inner tube 22 is in sealing connection with the inner surface of the outer tube 21 for creating a first 2261, a second 2262 and a third 2263 pressure taking chamber. A cyclone 221 is provided inside the inner tube 22 for generating a differential pressure. And the axial distance between the capacitance type electromagnetic flowmeter 6 and the tail end of the swirler 221 is 2-6 times of the pipe diameter.
The specific structure of the cyclone 221 is shown in fig. 3, and includes a central pressure-taking column 2211, a tail cone 2212, a cyclone sheet 2213 and a radial pressure-taking column 2214; one end of the central pressure-tapping column 2211 is connected with the tail cone 2212, and the other end is connected with the radial pressure-tapping column 2214. The central pressure-taking column 2211 is a hollow column, is located in the center of the cyclone 221, and is used for supporting the cyclone sheet 2213 and taking out the central pressure of the cyclone 221. The radial pressure-tapping columns 2214 are four hollow columns located on the same cross section, and the interiors of the radial pressure-tapping columns 2214 are communicated with the interior of the central pressure-tapping column 2211.
As shown in the perspective view of the inner tube in fig. 4, the wall surface of the inner tube 22 is provided with a first pressure-measuring groove 2231, a second pressure-measuring groove 2232, and a third pressure-measuring groove 2233. As shown in the cross-sectional view of fig. 2, each pressure-taking groove is connected to a pressure-taking point of the fluid in the pipe and three pressure-taking holes: the first pressure-taking hole 211, the second pressure-taking hole 212 and the third pressure-taking hole 213 are communicated with each other to form a first pressure-taking chamber 2261, a second pressure-taking chamber 2262 and a third pressure-taking chamber 2263, respectively.
Three inner tube pressure sampling point sets are arranged on the inner wall surface of the inner tube 22, and each inner tube pressure sampling point set comprises four small holes which are uniformly distributed along the circumferential direction of the inner tube 22. As shown in particular in fig. 2, wherein a first set of inner duct pressure tapping points 2241 is located upstream of said cyclone 221, arranged at the wall surface of the inner duct 22, for tapping the upstream pressure of said cyclone 221; a second set of inner tube pressure taps 2242 is disposed on the center pressure tap 2211 for tapping the center pressure of the cyclone 221; a third inner tube set of pressure tapping 2243 is located downstream of the cyclone 221, arranged at the wall surface of the inner tube 22, for tapping the pressure downstream of the cyclone 221. The second set of inner tube pressure points 2242 and the third set of inner tube pressure points 2243 are located at the same flow cross section, which is located upstream of the tip of the swirl sheet 2213 in the axial direction, so that the pressure extracted by the swirl sheet is not disturbed by a sudden change in the tip pressure of the swirler 221.
As shown in fig. 4, three pressure-taking grooves are arranged on the outer wall surface of the inner tube 22, and a first pressure-taking groove 2231, a second pressure-taking groove 2232, and a third pressure-taking groove 2233 are arranged in this order from upstream to downstream. Also, the first pressure taking groove 2231 is in communication with the first set of inner tube pressure taking points 2241, and the third pressure taking groove 2233 is in communication with the third set of inner tube pressure taking points 2243. As shown in fig. 3, the second pressure tapping 2232 connects the central pressure tapping 2211 via the radial pressure tapping 2214, and the central pressure tapping 2211 is in communication with a second set of inner tube pressure taps 2242; the second pressure-extracting groove 2232 also intersects the radial pressure-extracting column 2214 to form four communicating holes 227.
As shown in the perspective view of the outer tube in fig. 5, the first outer tube pressure-measuring hole 211 is communicated with the first pressure-measuring groove 2231 to form a first pressure-measuring chamber 2261; the second outer pipe pressure measuring hole 212 is communicated with the second pressure measuring groove 2232 to form a second pressure measuring chamber 2262; the third outer tube pressure-measuring hole 213 is communicated with the third pressure-measuring groove 2233 to form a third pressure-measuring chamber 2263. The three pressure chambers are sealed and isolated by a sealing means between the outer surface of the inner tube 22 and the inner surface of the outer tube 21.
In a preferred embodiment, as shown in fig. 6, four inner tube sealing grooves 222 are disposed on the outer wall surface of the inner tube 22, and each inner tube sealing groove 222 is provided with at least one inner tube O-ring 225 for sealing between the first, second and third pressure chambers 2261, 2262 and 2263.
The concrete structure of the tail cone 2212 is as shown in fig. 7, and includes a thin cylinder inserted into the downstream end of the central pressure-taking column 2211 and a cone connected to the end, the thin cylinder is circumferentially provided with a tail cone sealing groove 22121, and a tail cone O-ring 22122 is installed in the tail cone sealing groove 22121 and is used for sealing between the tail cone 2212 and the central pressure-taking column 2211. Moreover, the connection between the tail cone 2212 and the central pressure tapping column 2211 is detachable, so that the central pressure tapping column 2211 can be cleaned conveniently, and the interior of the central pressure tapping column 2211 is prevented from being blocked.
Therefore, the oil-water two-phase flow measuring method of the automatic metering system device for the thickened oil single well comprises the following steps:
step 1, the oil-water two-phase flow flows through the cycloneAfter the flow device 221, the radial differential pressure transmitter 4 outputs radial differential pressure delta P generated by the center and the wall surface on the same cross section under the action of rotational flowrAxial differential pressure Δ P generated at front and rear cross sections of cyclone 221 is output from axial differential pressure transmitter 5z；
in the formula, a, b, c and d are constants and are obtained by calibration through experiments; rhoOAnd ρWDensity of oil and water, respectively;
and 4, determining respective flow values of oil and water phases according to the following formula:
QO＝Q(1-β) (2)
QW＝Qβ (3)
in the formula QOIs the flow rate of oil, QWIs the flow rate of water.
In summary, the invention discloses a thick oil single well automatic metering system device and method, a differential pressure generating and leading-out device 2 is connected to a main pipeline, the device comprises an outer pipe 21 and an inner pipe 22 which are connected in a sealing way, a cyclone 221 for generating differential pressure is arranged in the inner pipe 22, a differential pressure transmitter is connected to the side surface of the cyclone, the differential pressure transmitter comprises a radial differential pressure transmitter 4 and an axial differential pressure transmitter 5, and a capacitance type electromagnetic flowmeter 6 is further arranged at the downstream of the main pipeline. Under the effect of the rotational flow generated by the rotational flow sheet 2213, the axial-symmetry phase distribution is beneficial to the measurement of the electromagnetic flowmeter, dispersed oil drops are concentrated at the center of the pipeline, and the viscosity characteristic of oil is enhanced, so that the concentrated oil can also obviously change the pressure difference between the front and the back of the cyclone 221 even under high water content, and the measurement still has higher precision. The invention can simultaneously and continuously measure the flow and the water content of each phase of oil and water in the produced liquid of the oil well on line, has high measurement precision and low cost, and can improve the overall economic benefit and the automation degree of the thermal recovery development of the heavy oil field.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. A thickened oil single-well automatic metering system is characterized by comprising an upstream main pipeline, a differential pressure generation and extraction device and a downstream main pipeline which have the same inner diameter and are sequentially and hermetically connected;
the differential pressure generating and leading-out device comprises an outer pipe and an inner pipe; the outer surface of the inner pipe is hermetically connected with the inner surface of the outer pipe;
a swirler used for generating differential pressure is arranged in the inner pipe; the cyclone comprises a central pressure taking column with a hollow columnar structure, and is positioned in the center of the cyclone; one end of the central pressure taking column is connected with a caudal vertebra, the other end of the central pressure taking column is connected with a group of radial pressure taking columns, each radial pressure taking column comprises four hollow columns positioned on the same cross section, and the interiors of the radial pressure taking columns are communicated with the interior of the central pressure taking column; the side surface of the central pressure taking column is also provided with at least one group of spinning disks;
the differential pressure generating and leading-out device is connected with a radial differential pressure transmitter and an axial differential pressure transmitter which are respectively used for outputting radial differential pressure generated by the center and the wall surface of the same cross section and axial differential pressure generated by the front and rear cross sections of the swirler;
a capacitance type electromagnetic flowmeter is arranged on the downstream main pipeline;
the inner pipe comprises three inner pipe pressure taking point sets, each inner pipe pressure taking point set comprises four small holes which are uniformly distributed along the circumferential direction of the inner pipe, and the first inner pipe pressure taking point set is positioned at the upstream of the swirler and arranged on the wall surface of the inner pipe; a second inner tube pressure taking point set is arranged on the central pressure taking column; a third inner tube pressure taking point set is positioned at the downstream of the swirler and arranged on the wall surface of the inner tube; the second inner tube pressure taking point set and the third inner tube pressure taking point set are located at the same flow cross section, and the position of the flow cross section in the axial direction is located at the upstream of the tail end of the spinning disc;
the outer pipe is provided with a pressure taking hole, the inner pipe is provided with a pressure taking groove, and the pressure taking groove is communicated with the pressure taking hole and a pressure taking point of fluid in the inner pipe to form a pressure taking cavity;
the outer wall surface of the inner pipe is provided with three pressure taking grooves, namely a first pressure taking groove, a second pressure taking groove and a third pressure taking groove from upstream to downstream; the first pressure taking groove is communicated with the first inner pipe pressure taking point set; the second pressure taking groove is intersected with the radial pressure taking column to form four communicating holes, and the second pressure taking groove is communicated with the second inner pipe pressure taking point set through the radial pressure taking column and the central pressure taking column; the third pressure taking groove is communicated with the third inner pipe pressure taking point set;
the outer pipe is provided with three pressure taking holes, namely a first pressure taking hole, a second pressure taking hole and a third pressure taking hole from upstream to downstream; the first pressure taking hole is communicated with the first pressure taking groove to form a first pressure taking chamber; the second pressure taking hole is communicated with the second pressure taking groove to form a second pressure taking chamber; the third pressure measuring hole is communicated with the third pressure measuring groove to form a third pressure measuring chamber; the three pressure taking chambers are sealed and isolated on the outer surface of the inner pipe and the inner surface of the outer pipe by adopting a sealing means;
four inner tube sealing grooves are arranged on the outer wall surface of each inner tube, and at least one inner tube O-shaped ring is arranged in each inner tube sealing groove and used for sealing the first pressure taking chamber, the second pressure taking chamber and the third pressure taking chamber respectively.
2. The automatic thick oil single well metering system of claim 1, wherein the axial distance between the capacitance type electromagnetic flowmeter and the tail end of the cyclone is 2-6 pipe diameters.
3. The automatic metering system of the thick oil single well as the thick oil single well are characterized in that the radial differential pressure transmitter is connected with the second pressure taking hole and the third pressure taking hole and is used for measuring the radial differential pressure generated by the center and the wall surface of the rotational flow on the same cross section; and the axial differential pressure transmitter is connected with the second pressure taking hole and the first pressure taking hole and is used for measuring the axial differential pressure generated at the front and rear sections of the swirler.
4. The thick oil single well automatic metering system of claim 1, characterized in that the tail cone is detachably connected with the central pressure taking column; the caudal vertebra includes the caudal vertebra seal groove, be equipped with caudal vertebra O type circle in the caudal vertebra seal groove, be used for the caudal vertebra with sealed between the post is got to the center.
5. A method for measuring oil-water two-phase flow of a thick oil single well automatic metering system according to any one of claims 1 to 4, comprising the steps of:
step 1, after the oil-water two-phase flow flows through the cyclone, the radial differential pressure transmitter outputs a radial differential pressure delta P generated by the center and the wall surface on the same cross section under the cyclone effectrThe axial differential pressure transmitter outputs the axial differential pressure delta P generated at the front and rear sections of the cyclonez；
Step 2, mixing
As a dependent variable of the calculation formula, the relation between the dependent variable and the total flow Q and the water content beta of the oil-water two-phase flow is as follows:
in the formula, a, b, c and d are constants and are obtained by calibration through experiments; ρ is a unit of a gradientOAnd ρWDensity of oil and water, respectively;
step 3, the flow value output by the capacitance type electromagnetic flowmeter is the total flow Q of the oil-water two-phase flow, the total flow Q is substituted into formula (1), and the water content beta is calculated;
and 4, determining respective flow values of oil and water phases according to the following formula:
QO＝Q(1—β) (2)
QW＝Qβ (3)
in the formula QOIs the flow rate of oil, QWIs the flow rate of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911410401.3A CN111058831B (en) | 2019-12-31 | 2019-12-31 | Automatic metering system device and method for single thickened oil well |
Applications Claiming Priority (1)
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