CN113567297B - High-precision crude oil water content measuring instrument - Google Patents
High-precision crude oil water content measuring instrument Download PDFInfo
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- CN113567297B CN113567297B CN202110841159.6A CN202110841159A CN113567297B CN 113567297 B CN113567297 B CN 113567297B CN 202110841159 A CN202110841159 A CN 202110841159A CN 113567297 B CN113567297 B CN 113567297B
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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 an external diversion cavity to inject crude oil to be measured, so that the flow speed of the crude oil to be measured can be reduced, and the formation of foam in the crude oil to be measured can be reduced; the components such as the bubble blocking cavity, the partition board II and the partition board III are designed in the comparison cavity, so that the foam of the crude oil to be measured is further reduced, the influence of the foam on the measurement precision in the process of measuring 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 extraction, the oil-water ratio is an important parameter for representing an oilfield reservoir, is also an important basis for preparing and adjusting oilfield extraction schemes and optimizing production parameters, and has important significance for prolonging the service life of an oil gas well and improving the recovery ratio by accurately measuring the water content of the crude oil.
The existing crude oil water content measuring instrument mainly measures the pressure difference between crude oil and contrast liquid at the same liquid level, and then calculates the crude oil water content according to the measured pressure difference and the combination of water and crude oil density. Before the measurement of the pressure difference of two liquids, the liquid level of the injected crude oil in the measurement cavity is monitored by the micro differential pressure sensor, the existing monitoring means is that the contrast cavity where the contrast liquid is located is connected with the measurement 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 to the controller. However, the existing crude oil water content measuring instrument does not have any means for preventing foam from entering the contrast liquid cavity, and an oil film is formed after the foam enters the contrast liquid cavity to break, if the working condition is poor, the foam is excessive, the oil film is thick, and therefore the upper differential pressure transmitter can misjudge the set threshold value.
Accordingly, there is a need for a crude oil water content measuring instrument that can reduce the impact of crude oil foam on crude oil water content measurement.
Disclosure of Invention
In view of the above, the present invention proposes a high-precision crude oil water content measuring instrument capable of reducing the influence of crude oil foam on the measurement of crude oil water content, the measuring instrument comprising: cavity, inlet tube, last little differential pressure sensor, down little differential pressure sensor, go up outlet tube, motorised valve and outlet tube down, the measuring apparatu still includes: a diversion cavity;
the cavity comprises a left cavity and a right cavity, the two cavities are respectively a measuring cavity and a contrast cavity, the two cavities are separated by a partition board I, and square holes are formed in the upper part of the partition board I;
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;
the upper part of the comparison cavity is provided with a baffle plate II, a bubble blocking cavity is arranged above one side of the baffle plate II, which is close to the measurement cavity, the bubble blocking cavity is communicated with the measurement cavity through a square hole on the baffle plate I, and the bottom opening of the bubble blocking cavity enables the measurement cavity to be communicated with the part of the comparison cavity, which is positioned below the baffle plate II; a liquid overflow cavity is arranged above the other side of the partition board II, an opening at 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 diversion cavity;
the flow guide cavity is positioned at the outer side of the upper part of the measuring cavity and is communicated with the measuring cavity through a square opening above the measuring cavity; the upper part of the inner side surface of the diversion cavity I is provided with a convection opening, and the lower part of the diversion cavity I is provided with a baffle plate, wherein the convection opening is opposite to the square opening, and the upper edge of the baffle plate is flush with the lower edge of the convection opening; crude oil to be measured can be input into the measuring cavity through the inlet pipe, the flow guiding cavity and the convection opening and the square opening arranged on the flow guiding 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 contrast 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 lower micro differential pressure sensor is equal in height with two interfaces connected with the cavity and is 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, the top of the partition board I is provided with a plurality of pressure equalizing holes, and the measuring cavity is communicated with the part of the contrast cavity above the partition board II.
Preferably, the contrast chamber further comprises a partition plate III, wherein the partition plate III is positioned below the partition plate II and is positioned on the right side of the bottom opening of the bubble blocking chamber.
The beneficial effects of the invention are as follows: the invention discloses a high-precision crude oil water content measuring instrument, which adopts a mode of externally connecting a flow guide cavity to inject crude oil to be measured, so that the flow rate of the crude oil can be reduced, foam formation in the crude oil is reduced, and components for further reducing the foam of the crude oil, such as a bubble blocking cavity, a baffle II, a baffle III and the like, are designed in a comparison cavity so as to reduce the influence of the foam of the crude oil in 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 a crude oil water content measuring instrument of the present invention;
FIG. 2 is a side view partially in cross-section of the crude oil water content meter assembly 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 the mounting structure of the crude oil water content measuring instrument of the present invention;
FIG. 5 is a rear view of the mounting structure of the crude oil water content meter according to the present invention;
in the figure: 1. measuring chamber 2, contrast chamber 3, inlet pipe 4, diversion chamber 5, upper differential pressure sensor 6, lower differential pressure sensor 7, upper outlet pipe 8, electric valve 9, lower outlet pipe 11, ball valve 12, orifice plate 13, equalizing hole 21, baffle plate II22, baffle plate III 23, bubble blocking chamber 24, liquid overflow chamber 25, pressure balancing pipe 41, convection port 42, baffle plate 51. U-shaped elbow.
Detailed Description
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
The invention will now be described in detail with reference to the drawings and specific examples.
The high-precision crude oil water content measuring instrument shown in fig. 1-5 comprises the following components, and the functions of the components are as follows:
the cavity comprises a left cavity and a right cavity, and as shown in fig. 1, 3 and 5, the two cavities are a measuring cavity 1 and a comparison cavity 2 respectively, the two cavities are separated by a partition board I, and square holes are formed in the upper part of the partition board I.
As shown in fig. 3 and 5, the top of the measuring cavity 1 is provided with a ball valve 11, the lower part 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; the measuring chamber of the measuring cavity 1 is arranged above the orifice plate 12, namely, the injected crude oil to be measured enters the upper part of the orifice plate 12, and the part of the measuring cavity below the orifice plate 12 is injected with contrast liquid before measuring, so that the measuring port of the lower micro differential pressure sensor 6 is protected from being polluted by the crude oil.
As shown in fig. 3, a baffle plate I121 is installed at the upper part of the comparison cavity 2, a bubble blocking cavity 23 is arranged above one side of the baffle plate II21, which is close to the measurement cavity 1, the bubble blocking cavity 23 is communicated with the measurement cavity 1 through a square hole on the baffle plate I, and the bottom of the bubble blocking cavity 23 is opened to enable the measurement cavity 1 to be communicated with the part of the comparison cavity 2, which is positioned below the baffle 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 side is connected with a pressure balance pipe 25; the top of the partition board I is provided with a plurality of pressure equalizing holes 13, and the measuring cavity 1 is communicated with the part of the comparison cavity 2 above the partition board II21, so that the pressure of the two cavities is consistent; in addition, the contrast chamber 2 comprises a partition III22, and the partition III22 is positioned below the partition II21 and positioned on the right side of the bottom opening of the bubble blocking chamber 23.
The square hole on the partition board I and the bubble blocking cavity 23 communicated with the square hole are used for communicating the measuring cavity 1 with the contrast cavity 2 through the square hole and the bubble blocking cavity 23; and secondly, the foam of the crude oil flowing into the comparison cavity 2 can be reduced by adopting the square holes and the bubble blocking cavities 23, so that the disturbance of the foam rupture to the pressure in the comparison cavity 2 is reduced, and the measurement accuracy of the water content of the crude oil is improved.
The above-mentioned partition plate III22 separates the portion of the contrast chamber 2 located below the partition plate II21, and the main purpose thereof is to further reduce the disturbance of the crude oil foam on the measurement of the upper differential pressure sensor 5, because the partition plate III22 can block the disturbance of the crude oil injected into the contrast chamber 2 from the bubble blocking chamber 23 on the level of the contrast liquid in the contrast chamber 2 and the influence of the crude oil foam on the measurement result of the upper differential pressure sensor 5 communicating with the liquid overflow chamber 24.
The liquid overflow cavity 24 has the function of reducing the area of the liquid level measured by the upper micro differential pressure sensor 5, and detecting the threshold value of the liquid level of the crude oil to be measured can be completed by only flowing a small amount of crude oil into the comparison cavity 2, so that a large amount of crude oil is prevented from entering the comparison cavity 2, and the influence of a large amount of foam in the comparison cavity 2 on measurement is avoided. The pressure balancing pipe 25 is used for balancing the pressure of the liquid overflow cavity 24, so as to avoid inaccurate measurement results caused by the pressure holding of the liquid overflow cavity 24.
The inlet pipe 3 and the diversion cavity 4 are shown in fig. 1, 2 and 4, and the inlet pipe 3 is arranged on the diversion cavity 4; the flow guiding cavity 4 is positioned at 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 the inner side surface of the diversion cavity 4 is provided with a convection opening 41, and the lower part is provided with a baffle plate 42, wherein the convection opening 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 opening 41; crude oil to be measured can be input into the measuring cavity 1 through the inlet pipe 3, the flow guiding cavity 4, the convection opening 41 and the square opening which are arranged on the flow guiding cavity 4.
Before measurement, contrast liquid is injected into the contrast cavity 2, the contrast liquid is generally groundwater at a petroleum exploitation place, during measurement, crude oil to be measured is continuously injected into the measurement cavity 1 through the inlet pipe 3 and the diversion cavity 4, the diversion cavity 4 can reduce the speed and the pressure of the injected crude oil, the formation of foam in the crude oil is reduced, the retention time of the crude oil in the diversion cavity 4 can be prolonged by the baffle plate 42, the flow rate of the crude oil is reduced, and the formation of foam in the crude oil is reduced.
The orifice plate 12 slows down the crude oil liquid, causing the liquid in the right chamber to be at a relatively static state, avoiding the influence of external pressure fluctuation on measurement, thereby improving the measurement accuracy.
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 contrast cavity 2, and the other measuring port is communicated with the top of the cavity through the U-shaped bent pipe 51; the upper micro differential pressure sensor 5 is mainly used for monitoring the liquid level position of the injected crude oil in 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 the 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 micro differential pressure sensor 6 is connected with the cavity and has the same height with two interfaces and is positioned below the pore 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 contrast chamber 2, and then calculating the water content of the crude oil by utilizing the pressure difference and the contrast 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 connected with the lower part of the measuring chamber 1 and located on the same side of the measuring chamber 1 as the upper outlet pipe 7, and an electrically operated valve 8 mounted on the lower outlet pipe 9.
The invention discloses a pollution-free high-precision crude oil water content measuring instrument of 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 liquid injected into the measurement cavity are set in the instrument control system; then the electric valve 8 of the outlet pipe 9 is closed to enable the liquid level of the crude oil 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, the controller collects the numerical value of the lower micro differential pressure sensor 6, the electric valve 8 is opened to enable the crude oil to be smoothly discharged, finally the water content of the crude oil is calculated according to a pressure and density formula, and in the measuring process, gas and a small amount of liquid in the mixed phase fluid are discharged through the cyclone.
Claims (3)
1. A high precision crude oil water content meter, the meter comprising: cavity, inlet tube (3), go up little differential pressure sensor (5), down little differential pressure sensor (6), go up outlet tube (7), motorised valve (8) and lower outlet tube (9), its characterized in that, the measuring apparatu still includes: a diversion cavity (4);
the cavity comprises a left cavity and a right cavity, the two cavities are a measuring cavity (1) and a comparison cavity (2) respectively, the two cavities are separated by a partition board I, and square holes are formed in the upper part of the partition board 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 arranged above one side surface of the measuring cavity (1);
the upper part of the comparison cavity (2) is provided with a baffle II (21), a bubble blocking cavity (23) is arranged above one side of the baffle II (21) close to the measurement cavity (1), the bubble blocking cavity (23) is communicated with the measurement cavity (1) through a square hole at the upper part of the baffle I, and the bottom of the bubble blocking cavity (23) is opened to enable the measurement cavity (1) to be communicated with the part of the comparison cavity (2) positioned below the baffle II (21); a liquid overflow cavity (24) is arranged above the other side of the partition board II (21); 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 is connected with a pressure balance pipe (25);
the inlet pipe (3) is arranged on the diversion cavity (4);
the flow guide cavity (4) is positioned at 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 diversion cavity (4) is provided with a convection opening (41), and the lower part of the diversion cavity is provided with a baffle plate (42), wherein the convection opening (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 opening (41); crude oil to be measured can be input into the measuring cavity (1) through the inlet pipe (3), the flow guiding cavity (4), the convection opening (41) arranged on the flow guiding 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 contrast 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 two interfaces of the lower micro differential pressure sensor (6) connected with the cavity are equal in height and are 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 a plurality of pressure equalizing holes (13) are formed in the top of the partition board I, and the measuring cavity (1) is communicated with the part of the comparison cavity (2) above the partition board II (21).
3. The high-precision crude oil water content measuring instrument according to claim 2, wherein the comparison cavity (2) further comprises a partition plate III (22), and the partition plate III (22) is positioned below the partition plate II (21) and positioned on the right side of the bottom opening of the bubble blocking cavity (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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| CN202110841159.6A CN113567297B (en) | 2021-07-23 | 2021-07-23 | High-precision crude oil water content measuring instrument |
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| CN113567297B true CN113567297B (en) | 2023-06-27 |
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