CN113567297A - High-precision crude oil water content measuring instrument - Google Patents
High-precision crude oil water content measuring instrument Download PDFInfo
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- CN113567297A CN113567297A CN202110841159.6A CN202110841159A CN113567297A CN 113567297 A CN113567297 A CN 113567297A CN 202110841159 A CN202110841159 A CN 202110841159A CN 113567297 A CN113567297 A CN 113567297A
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- cavity
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- crude oil
- partition plate
- pressure sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
Abstract
The invention discloses a high-precision crude oil water content measuring instrument, which comprises: the measuring instrument adopts a mode of externally connecting the diversion cavity to inject crude oil to be measured, so that the flow velocity of the crude oil to be measured can be reduced, and the formation of foam in the crude oil to be measured is reduced; the bubble is designed in the comparison cavity to block the parts of the separation cavity, the partition plate II, the partition plate III and the like to further reduce the foam of the crude oil to be measured, so that the influence of the foam on the measurement precision in the measurement process of the water content of the crude oil is reduced, and the measurement precision is improved.
Description
Technical Field
The invention belongs to the field of crude oil monitoring, and particularly relates to a high-precision crude oil water content measuring instrument.
Background
In the process of crude oil exploitation, the proportion of oil and water is an important parameter for representing an oil field reservoir, and is also an important basis for making and adjusting an oil field exploitation scheme and optimizing production parameters, and the accurate measurement of the water content of crude oil has important significance for prolonging the service life of an oil-gas well and improving the recovery ratio.
The existing instrument for measuring the water content of crude oil mainly measures the pressure difference between the crude oil and a contrast liquid at the same liquid level and then calculates the water content of the crude oil by combining water and the density of the crude oil according to the measured pressure difference. Before measuring the pressure difference between two liquids, the crude oil water content measuring instrument needs to monitor the liquid level height of the crude oil injected into the measuring cavity through a micro differential pressure sensor, the existing monitoring means is that a contrast cavity where a contrast liquid is located is connected with a measuring port of the micro differential pressure sensor, and when the liquid level of the crude oil rises to a set threshold value, the micro differential pressure sensor can detect and feed back the liquid level to the controller. However, the existing crude oil water content measuring instrument does not have any means for preventing foam from entering the comparison liquid cavity, an oil film is formed after the foam enters the comparison cavity and is broken, and if the working condition is poor and the foam is too much, the oil film is thick, so that the upper differential pressure transmitter can misjudge the set threshold value.
Therefore, there is a need for a crude oil water content measuring instrument that can reduce the effect of crude oil foam on the measurement of crude oil water content.
Disclosure of Invention
In view of the above, the present invention provides a high-precision crude oil water content measuring instrument capable of reducing the influence of crude oil foam on crude oil water content measurement, the instrument comprising: cavity, import pipe, go up little differential pressure sensor, little differential pressure sensor down, go up outlet pipe, motorised valve and outlet pipe down, the measuring apparatu still includes: a flow guide cavity;
the cavity comprises a left cavity and a right cavity, the two cavities are a measurement cavity and a comparison cavity respectively, the two cavities are separated by a partition plate I, and the upper part of the partition plate I is provided with a square hole;
the top of the measuring cavity is provided with a ball valve, the lower part of the measuring cavity is provided with a pore plate, and the pore plate divides the measuring cavity into an upper part and a lower part; a square opening is formed above one side surface of the measuring cavity;
a partition plate II is mounted at the upper part of the comparison cavity, a bubble blocking cavity is arranged above one side, close to the measurement cavity, of the partition plate II, the bubble blocking cavity is communicated with the measurement chamber through a square hole in the partition plate I, and an opening at the bottom of the bubble blocking cavity enables the measurement cavity to be communicated with the part, located below the partition plate II, of the comparison cavity; a liquid overflow cavity is arranged above the other side of the partition plate II, an opening on the lower bottom surface of the liquid overflow cavity is communicated with the lower part of the contrast cavity, and a pressure balance pipe is connected above the liquid overflow cavity;
the inlet pipe is arranged on the flow guide cavity;
the flow guide cavity is positioned on the outer side of the upper part of the measuring cavity and is communicated with the measuring cavity through a square opening on the measuring cavity; the upper part of one inner side surface of the flow guide cavity is provided with a convection port, the lower part of the flow guide cavity is provided with a baffle plate, the convection port is opposite to the square opening, and the upper edge of the baffle plate is flush with the lower edge of the convection port; crude oil to be measured can be input into the measuring cavity through the inlet pipe, the flow guide cavity and the convection port and the square opening which are formed in the flow guide cavity;
the upper micro differential pressure sensor is arranged at the upper part of the outer side of the cavity, one measuring port of the upper micro differential pressure sensor is communicated with the liquid overflow cavity of the comparison cavity, and the other measuring port is communicated with the top of the cavity through a double U-shaped bent pipe;
the lower micro differential pressure sensor is arranged at the lower end of the cavity, and two measuring ports of the micro differential pressure sensor are respectively communicated with the measuring cavity and the contrast cavity; the two interfaces of the lower micro differential pressure sensor, which are connected with the cavity, are equal in height and are positioned below the pore plate;
one end of the upper outlet pipe is connected with the measuring cavity, and the other end of the upper outlet pipe is connected with the lower outlet pipe;
the electric valve is arranged on the lower outlet pipe;
the lower outlet pipe is connected with the lower part of the measuring cavity and is positioned on the same side of the measuring cavity as the upper outlet pipe.
Preferably, a plurality of pressure equalizing holes are formed in the top of the partition plate I, and the measuring cavity is communicated with the part, above the partition plate II, of the comparison cavity.
Preferably, the contrast chamber further comprises a partition plate III, and the partition plate III is positioned below the partition plate II and positioned on the right side of the bottom opening of the bubble blocking chamber.
The invention has the beneficial effects that: the invention discloses a high-precision crude oil water content measuring instrument, which injects crude oil to be measured in an external diversion cavity mode, can reduce the flow velocity of the crude oil and reduce the formation of foam in the crude oil, and designs a bubble blocking cavity, a partition plate II, a partition plate III and other components for further reducing the foam of the crude oil in a comparison cavity so as to reduce the influence of the foam of the crude oil in the measurement on a water content measuring result, thereby improving the water content measurement.
Drawings
FIG. 1 is a perspective view of an assembly structure of the crude oil water content measuring instrument of the present invention;
FIG. 2 is a side view partially cut-away view of the assembly structure of the crude oil water content measuring instrument of the present invention;
FIG. 3 is a sectional view of an assembly structure of the crude oil water content measuring instrument of the present invention;
FIG. 4 is a top view of an assembly structure of the crude oil water content measuring instrument of the present invention;
FIG. 5 is a rear view of an assembly structure of the crude oil water content measuring instrument of the present invention;
in the figure: 1. the measuring cavity 2, the comparison cavity 3, the inlet pipe 4, the diversion cavity 5, the upper micro differential pressure sensor 6, the lower micro differential pressure sensor 7, the upper outlet pipe 8, the electric valve 9, the lower outlet pipe 11, the ball valve 12, the orifice plate 13, the pressure equalizing hole 21, the partition plate II22, the partition plate III 23, the bubble resistance separation cavity 24, the liquid overflow cavity 25, the pressure equalizing pipe 41, the convection port 42, the baffle plate 51 and the U-shaped elbow pipe.
Detailed Description
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
The invention is described in detail below with reference to the figures and specific embodiments.
The high-precision crude oil water content measuring instrument shown in figures 1 to 5 comprises the following components:
the cavity comprises a left cavity and a right cavity, as shown in fig. 1, fig. 3 and fig. 5, the two cavities are a measurement cavity 1 and a comparison cavity 2 respectively, the two cavities are separated by a partition plate I, and a square hole is formed in the upper part of the partition plate I.
As shown in fig. 3 and 5, the measuring cavity 1 is provided with a ball valve 11 at the top and an orifice plate 12 at the bottom, and the orifice plate 12 divides the measuring cavity 1 into an upper part and a lower part; a square opening is formed above one side surface of the measuring cavity 1; the upper part of the pore plate 12 is a measurement chamber of the measurement cavity 1, namely, injected crude oil to be measured enters the upper part of the pore plate 12, and contrast liquid is injected into the measurement chamber part below the pore plate 12 before measurement, so that the measurement port of the lower micro differential pressure sensor 6 is protected from being polluted by the crude oil.
As shown in fig. 3, a partition plate I121 is installed at the upper part of the contrast chamber 2, a bubble blocking compartment 23 is arranged above one side of the partition plate II21 close to the measurement chamber 1, the bubble blocking compartment 23 is communicated with the measurement chamber 1 through a square hole on the partition plate I, and the bottom of the bubble blocking compartment 23 is opened so that the measurement chamber 1 is communicated with the part of the contrast chamber 2 below the partition plate 1I 21; a liquid overflow cavity 24 is arranged above the other side of the partition plate II21, the lower bottom surface opening of the liquid overflow cavity 24 is communicated with the lower part of the contrast cavity 2, and the upper part of the liquid overflow cavity is connected with a pressure balance pipe 25; the top of the clapboard I is provided with a plurality of pressure equalizing holes 13, the measuring cavity 1 and the comparison cavity 2 are communicated with the part above the clapboard II21, so that the pressure of the two cavities is consistent; in addition to this, a partition III22 is included in the contrast chamber 2, said partition III22 being located below the partition II21 and to the right of the bottom opening of the bubble resistant compartment 23.
The square hole arranged on the partition plate I and the bubble resistance separation cavity 23 communicated with the square hole are used for communicating the measurement cavity 1 with the comparison cavity 2 through the square hole and the bubble resistance separation cavity 23; and secondly, the square hole and the bubble barrier separation cavity 23 are adopted to reduce the foam of the crude oil flowing into the comparison cavity 2, so that the disturbance of the pressure in the comparison cavity 2 caused by the foam rupture is reduced, and the measurement precision of the crude oil water content is improved.
The partition III22 partitions the part of the comparison cavity 2 below the partition II21, and the main purpose of the partition is to further reduce the disturbance of crude oil foam on the measurement of the upper micro differential pressure sensor 5, because the partition III22 can block the disturbance of crude oil injected into the comparison cavity 2 from the bubble-blocking cavity 23 on the liquid level of the comparison liquid in the comparison cavity 2 and the influence of crude oil foam on the measurement result of the upper micro differential pressure sensor 5 communicated with the liquid overflow cavity 24.
The effect of above-mentioned liquid overflow chamber 24 lies in, reduces the area of going up little differential pressure sensor 5 and measuring the liquid level, only needs a small amount of crude oil to flow into contrast chamber 2 and can accomplish the detection of the crude oil liquid level threshold value that awaits measuring to avoid a large amount of crude oil to get into contrast chamber 2, and then avoided contrast chamber 2 in a large number of foams to the influence of measuring. The pressure balancing pipe 25 is used for balancing the pressure of the liquid overflow cavity 24, and the inaccuracy of a measuring result caused by the pressure build-up of the liquid overflow cavity 24 is avoided.
An inlet pipe 3 and a diversion cavity 4, as shown in fig. 1, 2 and 4, the inlet pipe 3 is installed on the diversion cavity 4; the flow guide cavity 4 is positioned on the outer side of the upper part of the measuring cavity 1 and is communicated with the measuring cavity 1 through a square opening on the measuring cavity 1; the upper part of one inner side surface of the flow guide cavity 4 is provided with a convection port 41, the lower part is provided with a baffle plate 42, wherein the convection port 41 is opposite to the square opening, and the upper edge of the baffle plate 42 is flush with the lower edge of the convection port 41; crude oil to be measured can be input into the measuring cavity 1 through the inlet pipe 3, the flow guide cavity 4, the convection port 41 arranged on the flow guide cavity 4 and the square opening.
Before the measurement, inject contrast liquid into contrast chamber 2, contrast liquid is the groundwater of the place of exploitation oil generally, during the measurement, the crude oil that awaits measuring constantly injects the crude oil mixed liquid that awaits measuring into for measuring chamber 1 through import pipe 3, water conservancy diversion chamber 4 can carry out the deceleration decompression to the crude oil of injecting into, reduces the formation of foam in the crude oil, and baffling board 42 can increase the dwell time of crude oil in water conservancy diversion chamber 4, reduces the crude oil velocity of flow, reduces the formation of foam in the crude oil.
The orifice plate 12 slows down the crude oil liquid, so that the liquid in the right chamber is relatively static, and the influence of external pressure fluctuation on measurement is avoided, thereby improving the measurement precision.
An upper micro differential pressure sensor 5 which is arranged at the upper part of the outer side of the cavity, one measuring port of the upper micro differential pressure sensor 5 is communicated with the liquid overflow cavity 24 of the comparison cavity 2, and the other measuring port is communicated with the top of the cavity through a U-shaped bent pipe 51; the upper micro differential pressure sensor 5 is mainly used for monitoring the liquid level position of crude oil injected into the cavity, and when the liquid level of the crude oil reaches a set value, the electric valve 8 is opened after the water content measuring instrument collects data of the lower micro differential pressure sensor 6.
The lower micro differential pressure sensor 6 is arranged at the lower end of the cavity, and two measuring ports of the micro differential pressure sensor 6 are respectively communicated with the measuring cavity 1 and the comparison cavity 2; the two interfaces of the micro differential pressure sensor 6 connected with the cavity are equal in height and are positioned below the orifice plate 12; the lower micro differential pressure sensor 6 is mainly used for measuring the pressure difference between the two chambers of the measuring chamber 1 and the comparison chamber 2, and then the water content of the crude oil is calculated by utilizing the pressure difference and the comparison liquid density.
An upper outlet pipe 7, one end of which is connected with the measuring cavity 1 and the other end of which is connected with a lower outlet pipe 9;
a lower outlet pipe, which is connected to the lower part of the measuring chamber 1 and is located on the same side of the measuring chamber 1 as the upper outlet pipe 7, and an electric valve 8 mounted on the lower outlet pipe 9.
The invention discloses a pollution-free high-precision crude oil water content measuring instrument with a sensor, which comprises the following steps: during measurement, crude oil enters the measurement cavity 1 through the inlet pipe 3 and the convection port 41 on the diversion cavity 4, contrast liquid is injected into the contrast cavity 2 before measurement, and the liquid level value and the threshold value of the injected liquid in the measurement cavity are set in an instrument control system; and then closing the electric valve 8 of the outlet pipe 9 to enable the crude oil liquid level injected into the measuring cavity 1 to rise, when the upper micro differential pressure sensor 5 detects that the liquid level in the measuring cavity 1 reaches a set liquid level value, acquiring the numerical value of the lower micro differential pressure sensor 6 by the controller, opening the electric valve 8 to enable crude oil to be smoothly discharged, finally calculating the water content of the crude oil according to a pressure and density formula, and discharging gas and a small amount of liquid in the mixed phase fluid through a cyclone in the measuring process.
Claims (3)
1. A high accuracy crude oil water content gauge, the gauge comprising: cavity, import pipe (3), go up little differential pressure sensor (5), little differential pressure sensor (6) down, go up outlet pipe (7), motorised valve (8) and outlet pipe (9) down, its characterized in that, the measuring apparatu still includes: a flow guide cavity (4);
the cavity comprises a left cavity and a right cavity, the two cavities are a measurement cavity (1) and a comparison cavity (2) respectively, the two cavities are separated by a partition plate I, and a square hole is formed in the upper part of the partition plate I;
the top of the measuring cavity (1) is provided with a ball valve (11), the lower part of the measuring cavity is provided with a pore plate (12), and the pore plate (12) divides the measuring cavity (1) into an upper part and a lower part; a square opening is formed above one side surface of the measuring cavity (1);
a partition plate II (21) is mounted at the upper part of the comparison cavity (2), a bubble blocking separation cavity (23) is arranged above one side, close to the measurement cavity (1), of the partition plate II (21), the bubble blocking separation cavity (23) is communicated with the measurement cavity (1) through a square hole at the upper part of the partition plate I, and an opening at the bottom of the bubble blocking separation cavity (23) enables the measurement cavity (1) to be communicated with the part, located below the partition plate II (21), of the comparison cavity (2); a liquid overflow cavity (24) is arranged above the other side of the clapboard II (21); an opening on the lower bottom surface of the liquid overflow cavity (24) is communicated with the lower part of the contrast cavity (2), and the upper part of the liquid overflow cavity is connected with a pressure balance pipe (25);
the inlet pipe (3) is arranged on the flow guide cavity (4);
the flow guide cavity (4) is positioned on the outer side of the upper part of the measuring cavity (1) and is communicated with the measuring cavity (1) through a square opening on the measuring cavity (1); the upper part of one inner side surface of the flow guide cavity (4) is provided with a convection port (41), the lower part is provided with a baffle plate (42), wherein the convection port (41) is opposite to the square opening, and the upper edge of the baffle plate (42) is flush with the lower edge of the convection port (41); crude oil to be detected can be input into the measuring cavity (1) through the inlet pipe (3), the flow guide cavity (4), the convection port (41) formed in the flow guide cavity (4) and the square opening;
the upper micro differential pressure sensor (5) is arranged at the upper part of the outer side of the cavity, one measuring port of the upper micro differential pressure sensor (5) is communicated with the liquid overflow cavity (24) of the comparison cavity (2), and the other measuring port is communicated with the top of the cavity through a U-shaped bent pipe (51);
the lower micro differential pressure sensor (6) is arranged at the lower end of the cavity, and two measuring ports of the lower micro differential pressure sensor (6) are respectively communicated with the measuring cavity (1) and the comparison cavity (2); the lower micro differential pressure sensor (6) is equal in height with two interfaces connected with the cavity and is positioned below the pore plate (12);
one end of the upper outlet pipe (7) is connected with the measuring cavity (1), and the other end of the upper outlet pipe is connected with the lower outlet pipe (9);
the electric valve (8) is arranged on the lower outlet pipe (9);
the lower outlet pipe (9) is connected with the lower part of the measuring cavity (1) and is positioned on the same side of the measuring cavity (1) as the upper outlet pipe (7).
2. The high-precision crude oil water content measuring instrument according to claim 1, wherein the top of the clapboard I is provided with a plurality of pressure equalizing holes (13) which are used for communicating the measuring cavity (1) with the part of the comparison cavity (2) above the clapboard II (21).
3. The instrument for measuring the water content of crude oil in accordance with claim 2, wherein the comparison chamber (2) further comprises a partition plate III (22), and the partition plate III (22) is located below the partition plate II (21) and is located at the right side of the bottom opening of the bubble-resistant separation chamber (23).
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| CN202110841159.6A CN113567297B (en) | 2021-07-23 | 2021-07-23 | High-precision crude oil water content measuring instrument |
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