CN201689071U - Capacitance electroconductive tester for water content of crude oil - Google Patents

Abstract

The utility model relates to a capacitance electroconductive tester for water content of crude oil, which comprises a metal pipeline (1), a capacitance electrode (2), an electroconductive electrode (3), a first conductive column (4), a second conductive column (5) and a detecting circuit board. The capacitance electrode (2) and the electroconductive electrode (3) are arranged in a central through hole (11) of the metal pipeline (1), the detecting circuit board (61) is disposed outside the metal pipeline (1), a first end (41) of the first conductive column (4) and a first end (51) of the second conductive column (5) are respectively connected with the capacitance electrode (2), and a second end (42) of the first conductive column (4) and a second end (52) of the second conductive column (5) penetrate out of the metal pipeline (1) and are electrically connected with the detecting circuit board (61). Compared with the prior art, the capacitance electroconductive tester for water content of crude oil can be applicable to testing crude oil with high water content and crude oil with low water content, can effectively judge phase inversion points, and is accurate in real-time detection data, perfect in detection effect and wide in detection range.

Description

A Capacitance Conductivity Tester for Moisture Content of Crude Oil

technical field

The utility model relates to a tester for detecting the water content of crude oil, in particular to a capacitive conductance tester for the water content of crude oil in combination with a capacitive type and a conductance type.

Background technique

The water content in crude oil is a very important index to distinguish the fineness of crude oil. At present, the methods for determining the water content of crude oil include sampling distillation test method, microwave method, vibration density method and capacitance method, etc. But among them, the sample distillation test method is labor-intensive and time-consuming, the representativeness of the samples obtained is poor, sometimes the detection data error is large, and it cannot be detected in real time; the microwave method, due to the reflection coefficient of crude oil to microwave and the actual state of the oil-water mixture (i.e. water or oil-in-water), it needs to be corrected according to the actual situation, so it is difficult to adapt to the changing actual working environment, and it also brings a lot of trouble to the detection work; the vibration density method has strict requirements on the field conditions, so its stability Sex is poor.

The capacitance method is widely used because of its real-time detection, accurate detection results and stable operation. The basic principle of the capacitance method is to put a metal capacitor into the production layer of the oil well, let the oil-water mixture in the oil well enter the container, and then measure its capacitance. Because the measured capacitance is related to the dielectric coefficient of the mixture, and the relative permittivity of water is 81, and the relative permittivity of oil is 2-4. Capacity to back calculate the ratio of oil to water, so as to calculate the water content of crude oil. For example, the Chinese utility model patent "capacitance sensor for detecting moisture content of oil products" whose patent number is ZL03255754.X (announcement number is CN2629036Y) discloses a detection sensor that adopts the capacitance method. The detection sensor includes a probe, a fixed end and a terminal, the probe is a tubular capacitor, a cavity is provided between the two poles of the tubular capacitor, an oil flow hole communicated with the cavity is provided on the outer electrode of the tubular capacitor, and the tubular capacitor The inner electrode and the outer electrode are arranged on the coaxial core, and a plurality of oil flow holes communicating with the cavity are arranged on the outer electrode. When working, the sensor can detect the capacitance of the oil-water mixture flowing into its cavity, so as to obtain the water content of crude oil.

However, since many oil fields are in the middle and late stages of production, the water content of crude oil is generally above 50%. In this case, water acts as a conductor to short-circuit the two electrodes of the capacitor, making it difficult to detect the required capacitance. At this time , a single capacitance method cannot detect at all.

In addition, after the sensor of the above patent is applied to the crude oil pipeline, the oil-water mixture tends to stay in the cavity between the inner electrode and the outer electrode, especially when the flow rate of the oil-water mixture in the crude oil pipeline is relatively slow. , can not reflect the real-time data well, and the detection effect is not very ideal.

Utility model content

The technical problem to be solved by the utility model is to provide a crude oil water content capacitive conductance tester which is suitable for both low water content and high water content according to the current situation of the prior art. Its real-time detection data is accurate and the detection effect is ideal. , and the detection range is wide.

The technical scheme adopted by the utility model to solve the above-mentioned technical problems is: the crude oil water content capacitive conductivity tester, which is characterized in that it includes a metal pipeline, a capacitance electrode and a conductivity electrode arranged in the central through hole of the metal pipeline, a first Conductive pillars, second conductive pillars and a detection circuit board arranged outside the metal pipe;

Wherein, the capacitance electrode is insulated and isolated from the conductance electrode;

The first end of the first conductive column is connected to the capacitor electrode, and the second end passes through the metal pipe and is electrically connected to the detection circuit board;

The first end of the second conductive column is connected to the conductance electrode, and the second end passes through the metal pipe and is electrically connected to the detection circuit board;

Both the first conductive column and the second conductive column are insulated from the metal pipe;

Moreover, the detection circuit board can give a signal of the water content of the crude oil flowing through the central through hole of the metal pipeline according to the voltage signal provided by the first conductive column and the current signal provided by the second conductive column.

When the tester of the utility model is in use, it can be directly connected to the crude oil delivery pipeline, and the crude oil flows through the metal pipeline in sequence. Relatively low, the capacitive electrode and the metal pipe wall exhibit capacitive characteristics. The capacitive electrode can transmit the effective voltage signal to the detection circuit board through the first conductive column. The detection circuit board can obtain the final signal according to the voltage strength signal. At this time, due to the high oil content of the oil-water mixture, its conductivity is low, the conductance electrode and the metal pipe wall are basically insulated, and the current signal of the conductance electrode is very weak and basically does not change. The current signal is transmitted to the detection circuit board;

When the oil-water mixture in crude oil is in the state of oil-in-water, that is, the water content is high, its conductivity is high, and the resistance between the conductivity electrode and the metal pipe wall is low, and the conductivity electrode has an effective current signal through the second The conductive column is transmitted to the detection circuit board, and the detection circuit board finally obtains the final measured water content according to the current strength signal. At this time, the oil-water mixture has a relatively high dielectric constant due to its high water content. , A short circuit is formed between the capacitive electrode and the metal pipe wall, the signal of the capacitive electrode changes very little, and the basically unchanged current signal is transmitted to the detection circuit board.

The detection circuit board can provide a signal of the water content of the incoming liquid in the metal pipe, and the detection circuit board can be electrically connected with an indicator light showing the water content, or connected with other components that can display the water content. Connection, preferably, the detection circuit board can be electrically connected with a display panel, and the display panel is used to display the measured moisture content data, so that the detection circuit board transmits the signal with the moisture content test result to the display panel , through the display panel to visually display the specific moisture content measured by the tester.

In order to facilitate the fixed installation of the capacitance electrode and the conductance electrode in the metal pipe, an electrode base can also be arranged in the metal pipe, and a first blind hole and a second blind hole are respectively opened on the left and right end surfaces of the electrode base. , the second end of the capacitance electrode and the second end of the conductance electrode are respectively inserted into the first blind hole and the second blind hole, and a compression nut is respectively set outside the capacitance electrode and the conductance electrode, and each compression nut thread It is connected outside the end of the electrode base, so that the capacitance electrode and the conductance electrode are firmly fixed, and the first end of the capacitance electrode and the first end of the conductance electrode are exposed in the central through hole of the metal pipe. At the same time, it is also convenient The insulation isolation setting of the capacitance electrode and the conductance electrode is realized.

If the electrode base is an insulating material, an insulating separation is naturally formed between the capacitive electrode and the conductive electrode. However, in order to prevent the electrode base from corroding in the oil-water mixture, the electrode base is preferably made of a metal material. For this reason, the capacitor electrode also needs to be wrapped with a layer of insulating sealing layer, and the second end of the conductance electrode also needs to be wrapped. An insulating and sealing sheath needs to be sheathed, and the insulating and sealing sheath extends at least to the part of the conductivity electrode outside the compression nut. Such a design can ensure the sealing performance between the capacitive electrode, the conductance electrode and the electrode base. Another significant effect of this design is that it can increase the capacitance that can be tested by the capacitive electrode.

At the same time, an O-shaped sealing ring can also be provided on the inner side of the compression nut to enhance the sealing effect.

In order to facilitate the fixed installation of the first conductive column, the second conductive column, the detection circuit board, the display panel and other components, a junction box can also be provided outside the metal pipe, and the detection circuit board is arranged in the junction box. In addition, the first conductive column and the second conductive column are sequentially provided with insulating sleeves and wiring conduits from the inside to the outside. The metal conduit is fixed to the pipe wall of the metal conduit. In this way, the wiring conduit and the metal conduit are fixed, and the junction box and the electrode base are connected to both ends of the wiring conduit. The wiring conduit, junction box, and electrode base are all reliably fixed relative to the metal conduit, making the connection of the entire tester reliable. ,stable.

In addition, the display panel can also be installed in the junction box above the detection circuit board. The junction box has a transparent window so that the display panel installed in it can be seen, and the display panel and the detection circuit board are connected through the connecting column. Phase electrical connection.

At the same time, the first conductive column is a stud bolt, the second conductive column is a conductive tube, the second end of the first conductive column and the second conductive column pass through the detection circuit board and are fixed relative to the detection circuit board by nuts , in order to connect with the detection circuit board and the two electrodes.

Compared with the prior art, the utility model has the advantages of:

1. By setting capacitance electrodes and conductance electrodes in the metal straight-through pipeline, the capacitance value or conductivity in the oil-water mixture is sensed, and the voltage signal or current signal of each electrode is transmitted to the detection through the first conductive column and the second conductive column. circuit board, so as to obtain the final measured moisture content;

2. When the oil-water mixture in crude oil is in the state of water-in-oil, the capacitance electrode will work; when the oil-water mixture in crude oil is in the state of oil-in-water, the conductivity electrode will work, that is, the case of low water content and high water content , the tester of the utility model can detect, and can effectively distinguish the phase transition point, has a wide application range, and the detection result is accurate and the detection effect is ideal;

3. The tester of the utility model is designed according to the explosion-proof requirements, and is very suitable for explosive gas occasions;

4. In the utility model, the capacitor electrode and the conductance electrode are arranged in the metal pipeline, so that the tester naturally forms a section of pipeline, which is convenient for industrial site installation. The two ends of the metal pipeline can be connected with the crude oil pipeline through flanges, so that the tester The instrument can detect online in real time and is easy to use.

Description of drawings

Fig. 1 is a structural schematic diagram of Embodiment 1 of the utility model.

Fig. 2 is a structural schematic diagram of an external structure of Embodiment 1 of the present utility model.

Fig. 3 is a structural schematic diagram of the electrode base and some wiring guides in Embodiment 1 of the present invention.

Fig. 4 is a schematic structural diagram of Embodiment 2 of the utility model.

Detailed ways

The utility model is described in further detail below in conjunction with the accompanying drawings.

Embodiment one:

As shown in Figures 1 to 3, the crude oil water content capacitive conductivity tester includes a metal pipeline 1, a capacitance electrode 2 and a conductivity electrode 3 arranged in the central through hole 11 of the metal pipeline 1, a first conductive column 4, The second conductive column 5, a junction box 8 arranged outside the metal pipe 1, and a detection circuit board 61 and a display panel 62 installed in the junction box 8;

Wherein, the metal pipe 1 is also provided with an electrode base 7. In this embodiment, the electrode base 7 is made of stainless steel to achieve anti-corrosion purposes. The left and right ends of the electrode base 7 are provided with a second A blind hole 71, a second blind hole 72, the second end 22 of the capacitance electrode 2, and the second end 32 of the conductance electrode 3 are respectively inserted into the first blind hole 71 and the second blind hole 72, and the capacitance electrode 2 and Each of the conductance electrodes 3 is provided with a compression nut 73, and an O-shaped sealing ring 74 is also arranged on the inner side of each compression nut 73, and each compression nut 73 is threaded outside the end of the electrode base 7, so that the capacitance The electrode 2 and the conductance electrode 3 are reliably installed in the central position of the central through hole 11 of the metal pipe 1 through the electrode base 7. The oil-water mixture in 11 is in full contact;

At the same time, the entire capacitance electrode 2 is also wrapped with a layer of insulating sealing layer 23, and an insulating sealing sheath 33 is sheathed outside the second end 32 of the conductive electrode 3, and the insulating sealing sheath 33 extends to the conductive electrode 3. The part outside the compression nut 73, in this embodiment, the end of the insulating sealing sheath 33 is located in the half position of the conductance electrode 3 protruding from the part outside the compression nut 73, so that the capacitance electrode 2 and the conductance electrode 3 Electrode 3-phase insulation isolation setting;

In this embodiment, the first conductive post 4 is a stud bolt, and the second conductive post 5 is a conductive tube;

The first end 41 of the first conductive column 4 is connected to the second end 22 of the capacitor electrode 2 through the electrode base 7 and the insulating sealing layer 23, and the second end 42 of the first conductive column 4 passes through the metal pipe 1 and electrically connected with the detection circuit board 61 in the junction box 8;

The first end 51 of the second conductive post 5 is connected to the second end 32 of the conductance electrode 3 through the electrode base 7 and the insulating sealing sheath 33, and the second end 52 of the second conductive post 5 passes through the metal pipe 1 and electrically connected with the detection circuit board 61 in the junction box 8;

The first conductive column 4 and the second conductive column 5 are all provided with insulating sleeves 91 and wiring conduits 92 from the inside to the outside in sequence, and the two ends of each wiring conduit 92 are connected with the junction box 8 and the electrode base 7 respectively. The middle part of the conduit 92 passes through the metal conduit 1 and is fixed to the pipe wall of the metal conduit 1, so as to realize the secure fixing of each component, and the first conductive column 4 and the second conductive column 5 are also insulated from the metal conduit 1;

Moreover, the detection circuit board 61 can give the signal of the water content of the crude oil flowing through the central through hole 11 of the metal pipeline 1 according to the voltage signal provided by the first conductive column 4 and the current signal provided by the second conductive column 5;

The display panel 62 is located above the detection circuit board 61, and the display panel 62 is used to display the measured water content data. The junction box 8 has a transparent window 81, so that the water content data on the display panel 62 can be seen.

In application, it is connected to the crude oil delivery pipeline through the flanges on both sides of the metal pipeline 1, and the oil-water mixture to be detected can flow continuously through the central through hole 11 of the metal pipeline 1 and fully contact the capacitance in the metal pipeline 1. Electrode 2 and conductivity electrode 3;

When the water content of the oil-water mixture in the crude oil is low, the capacitive electrode 2 acts, which has an effective voltage signal and transmits the voltage signal to the detection circuit board 61 through the first conductive column 4, and the detection circuit board 61 according to the current strength Signal, draw the size of the moisture content that finally measures, and show on the display panel 62;

When the water content of the oil-water mixture in the crude oil is relatively high, the conductivity electrode 3 takes effect, which has an effective current signal and transmits the current signal to the detection circuit board 61 through the second conductive column 5, and the detection circuit board 61 according to the current intensity Weak signal, the size of the finally measured moisture content is obtained, and displayed on the display panel 62 .

Embodiment two:

As shown in Figure 4, it is Embodiment 2 of the present utility model, and its difference from Embodiment 1 is: in order to be able to test the oil-water mixture with small flow rate, the central through hole 11 of the metal pipe 1 is located at its entrance and exit respectively. A small metal tube 12 is provided, and the small metal tube 12 is located outside the first end 21 of the capacitance electrode 2 and the first end 31 of the conductance electrode 3 and keeps a small distance therebetween.

Claims (8)

1. A crude oil water content capacitive conductivity type tester is characterized in that: comprise a metal pipeline (1), be arranged on the capacitive electrode (2) and the conductivity electrode (3) in the central through hole (11) of metal pipeline (1) ), the first conductive column (4), the second conductive column (5) and a detection circuit board (61) arranged outside the metal pipeline (1); Wherein, the capacitance electrode (2) is insulated and isolated from the conductance electrode (3); The first end (41) of the first conductive column (4) is connected to the capacitor electrode (2), and the second end (42) passes through the metal pipe (1) and is electrically connected to the detection circuit board (61); The first end (51) of the second conductive column (5) is connected to the conductivity electrode (3), and the second end (52) passes through the metal pipe (1) and is electrically connected to the detection circuit board (61), Both the first conductive column (4) and the second conductive column (5) are insulated from the metal pipe (1); In addition, the detection circuit board (61) can provide the voltage signal flowing through the central through hole (11) of the metal pipe (1) according to the voltage signal provided by the first conductive column (4) and the current signal provided by the second conductive column (5). The signal of the water content of the crude oil. 2. The crude oil water content capacitive conductivity tester according to claim 1, characterized in that: the detection circuit board (61) is electrically connected to a display panel (62), and the display panel (62) is used to display The measured moisture content data. 3. The crude oil water content capacitive conductivity tester according to claim 1, characterized in that: an electrode base (7) is also arranged in the metal pipeline (1), and the left and right sides of the electrode base (7) A first blind hole (71) and a second blind hole (72) are respectively opened on the end face, and the second end (22) of the capacitance electrode (2) and the second end (32) of the conductance electrode (3) are respectively inserted into the In the first blind hole (71), the second blind hole (72), and each cover is provided with a compression nut (73) outside the capacitance electrode (2) and the conductivity electrode (3), each compression nut (73) Threaded outside the end of the electrode base (7). 4. The capacitive conductometric tester for water content of crude oil according to claim 3, characterized in that: an O-ring (74) is arranged on the inner side of the compression nut (73). 5. crude oil water content capacitive conductometric type tester according to claim 3, is characterized in that: also wrap one deck insulating sealing layer (23) outside the whole capacitive electrode (2), the first of described conductometric electrode (3) An insulating sealing sheath (33) is sheathed outside the two ends (32), and the insulating sealing sheath (33) extends at least to the part of the conductance electrode (3) outside the compression nut (73). 6. The crude oil water content capacitive conductivity tester according to claim 3, characterized in that: a junction box (8) is also arranged outside the metal pipeline (1), and the detection circuit board (61) is arranged on Inside the junction box (8), and outside the first conductive column (4) and the second conductive column (5), an insulating sleeve (91) and a wiring guide (92) are sequentially sleeved from the inside to the outside, each The two ends of the wiring conduits (92) are respectively connected with the junction box (8) and the electrode base (7), and the middle part of each wiring conduit (92) passes through the metal conduit (1) and is fixed to the pipe wall of the metal conduit (1) . 7. The crude oil water content capacitive conductivity tester according to claim 6, characterized in that: the detection circuit board (61) is electrically connected to a display panel (62), and the display panel (62) is used to display The measured water content data, the display panel (62) is also installed in the junction box (8) and is positioned above the detection circuit board (61), the junction box (8) has a transparent window (81), the display panel (62) is electrically connected with the detection circuit board (61) through the connection column (63). 8. The crude oil water content capacitive conductivity tester according to any one of claims 1 to 7, characterized in that: the first conductive column (4) is a stud bolt, and the second conductive column (5) is a conductive tube.

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