WO2012130112A1

WO2012130112A1 - Method and apparatus for measuring oil-content in production fluid

Info

Publication number: WO2012130112A1
Application number: PCT/CN2012/073002
Authority: WO
Inventors: 王其明; 程国永
Original assignee: 威海海和科技有限责任公司
Priority date: 2011-03-28
Filing date: 2012-03-26
Publication date: 2012-10-04
Also published as: CN102959366B; CN102959366A

Abstract

A method for measuring the oil-content in a production fluid, comprising: inputting the production fluid into a vertical separation tank (1) via a pipeline (2), thus allowing for collection and settlement of oil and water into separated layers, and for formation of an emulsified oil layer at the mid-section of the separation tank and a free water layer at the lower-section; dividing along the vertical direction the volume of fluid within the separator tank (1) into multiple fluid layers in the horizontal direction, each fluid layer having the volume thereof predetermined; using an oil-water constituent measuring probe (6) to measure the oil-content of each fluid layer; acquiring the oil-content of the volumes corresponding to the multiple fluid layers on the basis of the measured oil-content of each fluid layer and of the predetermined volume of each fluid layer. Also provided is an apparatus for measuring the oil-content in the production fluid.

Description

The method and device for measuring the oil content of the oil production fluid are submitted to the Chinese Patent Office on March 28, 2011, and the application number is 201110087369. The invention patent name is "the method and device for measuring the oil content of the oil well produced liquid". Priority of the Chinese Patent Application, filed on Jun. 2, 2011, filed on Jan. 2, 2011, filed Dec. In this application. Technical field

The invention relates to a method for measuring the oil content of an oil produced in an oil field oil well and a device thereof. Specifically, it is a tank-type method and apparatus for multiphase separation and layer-by-layer detection of oil well produced liquid.

Background technique

In the production process of oil fields, the raw liquid extracted from the oil well is a mixed liquid composed of crude oil, water and associated gas, which can be called oil well produced liquid. Before the oil well production liquid is sent to the oil field joint station for centralized treatment, it needs to be metered according to the oil, water and gas three-phase components. The cylinder is called single well measurement, especially the oil production of the oil well is measured. Keep abreast of the production conditions of each oil well and rationally carry out production scheduling.

The existing single well metering technology in the oil field mainly includes intermittent metering technology for metering and separating tanks, continuous metering technology for two-phase separation and continuous metering technology for three-phase separation. Among them, the two-phase separation continuous measurement technology, such as the Chinese patent 200610105004. 1 , 200320125135. 8 respectively proposed technical solution, the structure is relatively compact, but the measurement error of the oil production of the oil well is too large, and can not be verified; three-phase separation continuous measurement Technology, such as the technical proposal proposed in Chinese patent 200420022701. 7, the measurement error of oil production in oil wells is obviously reduced, but the structure is complicated, the cost is high, the operation is difficult, and the measurement error of oil production in oil wells is not easy to verify. .

Therefore, the oil well metering device that is currently widely used in oil fields is still the metering separation tank interval. The metering technology, such as the technical scheme described in Chinese patent CN98222454. 0, is provided with a vertical separation tank, and at the upper, lower and top portions of the separation tank, respectively, an oil well production liquid input line and a liquid output line are respectively provided. The gas output pipeline is provided with an inlet valve, a drain valve and an exhaust valve respectively in the oil production liquid input pipeline, the liquid output pipeline and the gas output pipeline, and the measuring tank is also provided on the measuring separation tank. The liquid level meter of the inner liquid level; after the liquid inside the separation tank is emptied, the gas output valve and the oil well production liquid input valve are opened, the liquid output valve is closed, and the timing is started, and the oil well produced in the metering separation tank is in the tank. The gas and liquid are separated, and the separated gas is sent out through the gas output line. The liquid is gradually deposited in the lower part of the metering and separating tank under the monitoring of the liquid level meter, after the liquid level reaches a certain height indicated by the liquid level meter. , stop the timing, and then calculate the amount of liquid produced in the well during the time period, and then manually sample the oil content or water content by sampling from the wellhead. After obtaining the production of crude oil and water each.

The technical scheme has the advantages that the structure is simple and the cost is low, and the liquid production amount of the oil well in the time period or the unit time can be conveniently measured, but the production of the crude oil and the water in the time period cannot be simultaneously measured, and the oil well needs to be passed. Sampling, manual measurement of water cut rate to calculate the crude oil production of the oil well, due to the sampling time and the oil sample body has great uncertainty, so not only the oil well measurement time, labor intensity, measurement accuracy can not be guaranteed, Still can not meet the oilfield requirements for oil well measurement. Summary of the invention

The technical problem to be solved by the invention is to overcome the deficiencies of the prior art, to provide a method for the single cylinder, and the operation is reliable, and the metering and separating tank is used to measure the liquid production volume of the oil well during the time period, and the respective crude oil and water are measured. Production method; measuring method and device for oil content of oil well produced liquid with small measurement error and verification. According to an embodiment of the present invention, a method for measuring oil content of a produced liquid is provided, include:

The oil well produced liquid is input into a vertical separation tank through an input line to collect and carry out oil-water sedimentation stratification, forming an emulsified oil layer located in the middle of the separated tank body and a free water layer located at the lower portion;

Dividing the volume of liquid in the separation tank into a plurality of liquid layers in a horizontal direction in a vertical direction, the volume of each liquid layer being preset;

Measuring the oil content of each liquid layer using an oil-water component meter probe; obtaining the plurality according to the measured oil content of each of the liquid layers and each predetermined volume of the liquid layer The oil content of the volume corresponding to the liquid layer.

In addition, according to an embodiment of the present invention, there is also provided an oil well production liquid oil content metering device, comprising a vertical separation tank, wherein the oil well production liquid input pipe is respectively arranged at an upper portion, a lower portion and a top portion of the separation tank The road, the liquid output pipeline and the gas output pipeline are respectively provided with an inlet valve, a drain valve and an exhaust valve in the oil production liquid input pipeline, the liquid output pipeline and the gas output pipeline; A plurality of oil-water component measuring instrument probes are installed at different prescribed heights in the vertical direction of the separation tank.

The above-mentioned oil well production liquid input line may be disposed at any part of the separation tank body, such as the upper part, the middle part, the lower part, etc., but is preferably disposed at the upper part of the separation tank body from the viewpoint of simplifying design and facilitating separation of the three-phase medium.

The oil-water component measuring instrument probe may be a ray type, a high frequency or a microwave absorption type, a capacitor or an impedance type.

The oil-water component measuring instrument probe may be installed sideways or at the top, and may not be in a plane in the vertical direction.

The oil-water component measuring instrument probe and the liquid level meter can be dispersedly disposed on the separation tank or integrated into one body. In the specific work, the multiple oil-water component measuring probes are vertically filled with the emulsified oil layer in the middle of the separated tank body and extend downward into the free water. a layer extending upward into the gas layer;

For the convenience of description, we divide the separation tank into three parts in the vertical direction, namely, the water collection tank at the bottom, the oil collection tank at the middle, and the gas collection chamber at the upper part.

For the production of oil wells with higher water content, in order to ensure that the measurement accuracy of oil production is not reduced, in the case of oil well measurement, it is required that the emulsified oil layer located in the middle of the separation tank must reach the specified thickness, which requires the separation. The tank must be of sufficient height to provide sufficient space for the free water layer located in the lower portion, which increases the cost of the unit and reduces the adaptability of the unit to the field. To this end, the technical solution proposed by the present invention specifically designs a separation can body having a laterally reduced central portion, that is, the transverse cross-sectional area of the middle portion of the separation can body is 5% of the transverse cross-sectional area of the lower portion of the separation can body to 80%, under the condition that the height of the vertical separation tank does not increase, the thickness of the measurable emulsified oil layer is obviously increased, and the precision of crude oil measurement is improved.

According to the technical proposal proposed by the invention, a gas flow meter can be arranged on the gas output pipeline for measuring the gas production of the oil well in the agreed time period, and realizing the three-phase measurement of oil, water and gas.

In order to further improve the accuracy and convenience of the oil well metering, the technical solution proposed by the present invention may further comprise a data processing and control unit, wherein the data processing and control unit and the liquid level meter and the plurality of oil water groups respectively The measuring instrument probe, the gas flow meter, and the plurality of electric valves located on the respective lines are electrically connected. The data processing and control unit respectively controls the operation of each electric valve, quickly processes various collected data, and gives the measurement result of the measured oil well in time.

The beneficial effects brought by the technical solution proposed by the invention are:

First, the technical solution proposed by the present invention realizes the measurement of the amount of liquid produced in the oil well by using the metering and separating tank of the single cylinder, and simultaneously installs a plurality of oil and water components at different prescribed heights in the vertical direction of the separation tank. The measuring instrument probe can measure the oil content of the horizontal liquid layer where the probe is located in real time, and realize the measurement of the net output of crude oil. It is sufficient for the actual needs of oilfield production.

Secondly, by proposing a vertical separation tank with a reduced diameter in the middle, the height of the metering oil layer is correspondingly increased, and the metering and separating tank can be further improved under the condition that the accuracy of the meter, the oil-water component measuring instrument and the like are constant. Measurement accuracy, reducing the measurement error of crude oil production, especially suitable for the measurement of complex oil wells such as high water content and intermittent oil output.

DRAWINGS

The invention will be further described below in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of a plurality of oil-water component meter probes employing a side-mounted configuration in accordance with one embodiment of the present invention.

Fig. 2 is a schematic view showing another structure of an embodiment of the present invention, in which a plurality of oil-water component measuring instrument probes adopt a top-loading structure.

Fig. 3 is a schematic view showing a laterally reduced diameter structure of a central portion of a separation tank according to an embodiment of the present invention, wherein the liquid level meter and the plurality of oil-water component measuring instrument probes adopt an integrated top-mounted structure.

Figure 4 is a schematic illustration of one embodiment of the invention.

Figure 5 is a schematic illustration of another embodiment of the invention.

Figure 6 is a schematic view showing the structure of an embodiment of a probe used in the present invention.

Figure 7 is a schematic view showing the structure of a second electrode of one embodiment of the probe used in the present invention.

The figures are: 1. Separating tank, 101, collecting water tank in the lower part of the tank, 102, collecting oil tank in the middle of the tank, 103, collecting gas tank in the upper part of the tank; 2. Oil well producing liquid Input pipeline, 201, manual inlet valve, 202, electric inlet valve; 3, liquid output pipeline, 301, manual drain valve, 302, electric drain valve; 4, gas output pipeline, 401, manual row Air valve, 402, electric exhaust valve; 5, liquid level meter; 6, multiple oil and water component measuring instrument probe, 601, 602, 603... .... oil and water component measuring instrument probe; 7, data Processing and control unit; 56, multiple oil and water component measuring instrument probe and liquid level instrument integrated device; Gas flow meter 303, liquid flow meter; 304, online oil-water component meter; 305, mass flow meter; 306, drain pump; G601, G602, G603..., sampling port corresponding to oil-water component measuring instrument probe F601, F602, F603......, corresponding to each sampling port to the sampling valve; 701, electronic display; D1. First electrode, D2. Second electrode, D3. Support connector, D4. Isolation insulation, D5. Signal and data processing unit, D6. Electrical protection housing, D101. Segmentation pole, D102. Insulation fixture, D103. Segment pole lead, D104. Insulation layer, D105. Segment signal measuring circuit, D106. Data transmission bus, D201. Second electrode lead, D202. Connector, D401. Isolation insulation head, D402. Isolation insulation plug, D501. Electronic switch, D502. Common section signal measurement circuit. detailed description

According to an embodiment of the present invention, a method for measuring oil content of an oil well produced liquid is provided, which comprises inputting an oil well produced liquid into a vertical separation tank through an input pipeline, so as to gather and perform oil-water sedimentation stratification to form a location. Separating the emulsified oil layer in the middle of the tank and the free water layer in the lower portion; dividing the liquid volume in the separation tank into a plurality of liquid layers in the horizontal direction in a vertical direction, the volume of each liquid layer being preset; using oil water The component meter probe measures the oil content of each liquid layer; the plurality of liquid layers are obtained according to the measured oil content of each of the liquid layers and the volume of each of the preset liquid layers The oil content of the corresponding volume. In one embodiment, the oil well produced liquid is first input into a vertical separation tank through an input line, and after gas and liquid separation in the separation tank, a gas layer is formed on the upper part of the separation tank, and the gas passes through the upper gas output pipe. Off-road transportation, the liquid accumulates in the separation tank closed by the drain valve and stratifies the oil and water to form an emulsified oil layer located in the middle of the separated tank body and a free water layer located in the lower part; measured by a liquid level meter provided on the separation tank The liquid level in the tank; after the liquid level reaches the required height, the oil well production liquid input time T is recorded; at different specified heights in the vertical direction of the separation tank, a plurality of oil and water component measuring instrument probes are installed, and each probe measures the same In the oil content η i of the liquid layer, the intermediate surface of the adjacent probe is set as the upper interface or the lower interface of the liquid layer, and the thickness of the liquid layer of each probe is determined according to the structural size of the separation tank and the installation setting of the probe. The horizontal cross-sectional area Si is calculated, and the oil volume volume V _i of the liquid layer in each probe is calculated, and the oil content volume of each liquid layer of each probe is added, and the oil production volume V oil of the oil well in the liquid injection time T is obtained.

This technique is described in detail below. The production fluid of the oil well is input into a vertical separation tank through the input pipeline. After the gas and liquid separation in the separation tank, a gas layer is formed on the upper part of the separation tank, and the gas is discharged through the upper gas output pipeline, and the liquid is discharged. The separation tank of the liquid valve is closed and the oil and water is settled and layered to form an emulsified oil layer located in the middle of the separated tank body and a free water layer located at the lower part; a liquid level meter is arranged on the separation tank for measuring the liquid level in the tank; In the different specified heights of the vertical direction of the separation tank, a plurality of oil-water component measuring instrument probes are provided, and each oil-water component measuring instrument probe completely covered by the liquid below the liquid surface is positioned in the vertical direction. The utility model comprises a horizontal liquid layer having a certain thickness hi represented by data measured by the oil-water component measuring instrument probe, and an adjacent horizontal liquid layer seamlessly abutting each other, the horizontal liquid The upper and lower liquid levels of the layer depend on the height of the oil-water component measuring instrument probe and the adjacent upper and lower probes and their vertical dimensions. The measuring range, the height difference between the upper liquid surface of each horizontal liquid layer and the lower liquid surface, is the thickness of the horizontal liquid layer ^, ideally, in the vertical direction, each oil-water component measuring instrument probe measures The range is the same, the distance between the probes of two adjacent oil-water components is also equal. At this time, the thickness of each horizontal liquid layer is the height difference between the center points of two adjacent probes; adjacent The vertical distance between the oil and water component measuring instrument probes should be as small as possible to improve the accuracy of the oil and water measurement. The multiple oil and water component measuring instrument probes are vertically filled with the emulsified oil layer in the middle of the separated tank body and extend downward. Entering the free water layer and extending upward into the gas layer;

After the liquid level meter detects that the liquid level in the separation tank reaches the required height, immediately starts reading or starts to read the oil well output liquid through the valve to the short-circuit pipe, and then starts reading. Some readings include the infusion time T, the total liquid level Η, the oil content η i of each horizontal liquid layer, etc., since the structural size of the separation tank is known, the total liquid level H is read, and it is obtained The volume of liquid produced by the well in the feed time T is V; for each horizontal liquid layer i positioned by the probe of the oil-water component measuring instrument, from the horizontal liquid layer with the lowest η i being zero, to the first under the liquid surface a complete horizontal liquid layer n, the oil content ^, the thickness ^, the horizontal cross-sectional area S i are known, and the first complete layer n from the total liquid level to the liquid surface has an incomplete horizontal liquid The layer n+1 has a height which is the total liquid level H minus the upper liquid level H _n _t of the nth layer, and the liquid oil content is approximately the oil content η _η of the nth layer, and therefore, the integrity of each liquid layer The oil volume volume V _i and the oil content volume v _{n+1 of} the uppermost layer of the incomplete horizontal liquid layer can be calculated by adding the oil volume of each of the above horizontal liquid layers to obtain the liquid inlet time. Oil production volume of T inner oil well volume V oil

η η

V oil = X Si hi η i + S _n+1 η _n (H - upper)

η _; =0

In this way, we measure the amount of oil produced during the time period of the well, and also measure the corresponding oil production.

After the measurement is completed, the exhaust valve is closed, the drain valve and the inlet valve are opened, and the liquid in the separation tank is drained, and the next measurement can be performed.

For the convenience of description, we divide the above-mentioned separation tank into three parts in the vertical direction, that is, the water collection tank at the bottom, the oil collection tank at the middle, and the gas collection chamber at the upper part.

In addition, for the production of oil wells with higher water content, in order to ensure that the measurement accuracy of oil production does not decrease, in the case of oil well measurement, it is required that the emulsified oil layer located in the middle of the separation tank must reach the specified thickness, which requires The separation tank must have a sufficient height to provide a sufficiently large space for the free water layer located in the lower portion, which increases the cost of the apparatus and reduces the adaptability of the apparatus to the site. To this end, the technical solution proposed by the present invention specifically designs a separate can body which is laterally reduced in the middle, that is, the separation The transverse cross-sectional area of the middle portion of the tank body is 5% to 80% of the transverse cross-sectional area of the lower portion of the separation tank body. Under the condition that the height of the vertical separation tank body does not increase, the thickness of the measurable emulsified oil layer is obviously increased, and the thickness is increased. The accuracy of crude oil metering.

The apparatus for implementing the present invention will be further described below in conjunction with the accompanying drawings and examples.

Example 1 :

As shown in Fig. 1, an oil well production liquid oil content measuring device is provided with a vertical separation tank 1, and an oil well production liquid input line 2, liquid is respectively arranged at the upper part, the lower part and the top part of the separation tank 1. The output pipeline 3 and the gas output pipeline 4 are respectively provided with an inlet valve 201, a drain valve 301, and an exhaust valve 401 on the oil well production liquid input pipeline 2, the liquid output pipeline 3, and the gas output pipeline 4, respectively. There is also a liquid level meter 5 for monitoring the liquid level on the separation tank, which is characterized in that: the separation tank 1 is further provided with a plurality of oil-water component measuring instrument probes 6, which can be in sequence or simultaneously The horizontal liquid layer is subjected to oil content or moisture content measurement, and the oil-water component measuring instrument probe 6 side is mounted on the separation tank 1; in the vertical direction, each oil-water component measuring instrument probe such as 601, 602, etc., its height The dimensions are clear, and the liquid layers represented by the data measured by the adjacent oil-water component measuring probes are docked to each other.

The oil-water component measuring probes of the plurality of oil-water component measuring instrument probes 6, such as 601, 602, etc., each of the probes independently complete the oil content measurement of the horizontal oil and water layer, and the measured oil content should be representative of the level The average oil content of the liquid layer.

The liquid layers represented by the data measured by the adjacent oil-water component measuring instrument probes are mutually connected, that is, the lower interface of the oil-water layer where 601 is located should coincide with the upper interface of the oil-water layer where 602 is located; the lower interface of the oil-water layer where 602 is located should be Coincident with the upper interface of the oil-water layer where 603 is located, etc., in the vertical direction, regardless of the actual measured height of each oil-water component measuring instrument probe i, the thickness hi of the liquid layer defined by it may be large or small, Measured oil content η i can represent the oil content of the oil-water layer i in which it is located. As a preferred example, the measured height of the oil-water component meter probe can be made substantially equal to the thickness of each of the liquid layers.

The oil-water component measuring instrument probe may be a ray type, a high frequency or a microwave absorption type, a capacitor or an impedance type, and the oil-water component measuring instrument probe and the data processing and display module thereof may be one-to-one. It is also possible to connect a plurality of oil-water component meter probes to share a data processing and display module, which are well known to those skilled in the art.

Example 2:

As shown in FIG. 2, an oil well production liquid oil content measuring device is characterized in that the oil-water component measuring instrument probes 601, 602, 603, etc. are top mounted on the separation tank 1, and other features are the same as in the first embodiment. .

Example 3:

An oil well produced liquid oil content measuring device, characterized in that the oil-water component measuring instrument probes 601, 602, 603, etc. are integrated with the liquid level meter 5 as a device 56, and are top mounted on the separating tank 1, Other features are the same as in Example 1. Preferably, the liquid level is not higher than the top of the collection tank.

Example 4:

As shown in FIG. 3, an oil well production liquid oil content measuring device is characterized in that: the water collecting tank 101 in the lower part of the separating tank body and the oil collecting tank 102 in the middle portion are all circular in cross section, and the set is The diameter of the transverse section of the oil sump 102 is one-half the diameter of the transverse section of the sump 101, and the height of the sump 102 is three-fifths of the height of the sump 101, and other features are the same as in the example 3. Preferably, the liquid level is no higher than the top of the oil collection bin.

Example 5:

As shown in FIG. 3, an oil well production liquid oil content measuring device is characterized in that: the water collecting tank 101 in the lower part of the separating tank body and the oil collecting tank 102 in the middle portion are circular in cross section. The diameter of the lateral section of the oil collection bin 102 is one-third of the diameter of the lateral section of the water collection tank 101, and other features are the same as in the example 4.

Example 6:

As shown in FIG. 2, an oil well produced liquid oil content measuring device is characterized in that: a data processing and control unit 7 is provided, and the data processing and control unit 7 respectively and the liquid level meter 5; Each of the oil-water component measuring instrument probes 601, 602, 603, . . . , the gas flow meter 8, and the electric inlet valve 202, the electric drain valve 302, the electric exhaust valve 402, etc., which are located in the respective lines, are electrically connected. . The data processing and control unit 7 controls the operation of each electric valve, rapidly processes various collected data, and gives the measurement result of the measured oil well in time. Other features are the same as in Example 2.

Example 7:

As shown in FIG. 4, an oil well produced liquid oil content measuring device is characterized in that the side wall of the separating tank body and the plurality of oil-water component measuring instrument probes 601, 602, 603, ... respectively Corresponding sampling lines G601, G602, G603, ... are provided, and corresponding valves F601, F602, F603, ... are respectively arranged on each sampling line to verify the liquid moisture content of each oil-water component measuring instrument probe or The error of the oil content rate; at the same time, an electronic display screen 701 is provided which is electrically connected to the respective oil-water component measuring instrument probes to display the moisture content or oil content of each oil-water layer. When the oil and water component measuring instrument probe measures the error of the liquid moisture content or the oil content rate, the water content of the sampling liquid measured by the instrument is compared with the water content of the corresponding liquid layer displayed by the electronic display screen. Thereby, the measurement error of the oil-water component measuring instrument probe is obtained. The electronic display screen may be in the form of a liquid crystal, or may be an LED or other form.

Example 8:

Figure 5 shows. The utility model relates to an oil well production liquid oil content measuring device, which is characterized in that a liquid flow meter 303 is arranged on the liquid discharge line 3, in order to keep the emulsified oil layer in the oil collection tank 102 enough when measuring the oil well with high water content Height, can be in the points During the process of feeding from the tank, a plurality of free water is discharged from the water collection tank 101 through the drain line, and the discharged free water is metered by a flow meter disposed on the drain line 3, in the metering well It is counted in the amount of liquid produced, thus ensuring the overall measurement accuracy of the oil production of the well, and other characteristics are the same as in Example 2 (or 6).

Example 9:

The utility model relates to an oil well production liquid oil content measuring device, which is characterized in that a liquid flow meter 303 and an online oil-water component meter 304 are connected in series on the liquid discharge line 3, a liquid flow meter 303, and an online The oil-water composition meter 304 is electrically connected to the data processing and control unit 7, respectively. Here, a mass flow meter 305 can also be used in place of the combination of the liquid flow meter 303 and the in-line oil-water composition meter 304. The technical solution can provide an additional continuous oil quantity function of the oil production volume measuring device of the oil well, and the other features are the same as those of the example 2 (or 6).

Example 10:

As shown in FIG. 5, an oil well production liquid oil content measuring device is characterized in that a liquid discharging pump 306 is arranged on the liquid discharging pipeline 3, and the oil well metering device in the oil well is used to complete the measurement of a certain oil well. After that, it can be quickly drained by the drain pump 306 without relying on the associated gas in the oil production fluid, thereby improving the metering efficiency and application range of the oil well production fluid metering device, and other features and the embodiment 2 (or 6 )the same.

In the above example, the oil-water component measuring instrument probe of Figures 2 to 5 can be submitted to the Chinese Patent Office by the inventor on June 2, 2011, and the application number is 201120198393. 3 and the invention name is "a combination. Chinese patent application for a water-based measuring device and a combined electrode disclosed in Chinese Patent Application No. 201110158124. 9 and entitled "A Combined Water Measuring Device" Structure of the probe. In the case of the probe employing the combined electrode structure, the integrated device 56 of the liquid level meter and the oil-water component measuring instrument probes 601, 602, 603 involved in Example 3 can pass only the probe of the combined electrode structure. The head itself is implemented because the probe itself can measure the liquid level. The structure of the above probe is described below.

As shown in Fig. 6, the present invention relates to a combined aqueous measuring device for measuring the net content of a single-phase medium in a multi-phase mixed medium tank. This embodiment is for measuring the moisture content of the aqueous multi-phase mixed medium in the respective tanks in the horizontal tank, and is therefore also referred to as an aqueous analyzer array. It comprises a signal and data processing unit D5, a support connector D3, a sensor that protrudes into the container in contact with the multi-phase medium, an isolating insulator D4, an electrical protection housing D6, etc., the sensors being mutually in a vertical direction a first electrode D1 and a second electrode D2 which are parallel and spaced apart from each other in the horizontal direction, wherein:

The first electrode D1 is vertically divided by a set of tubular, independent conductive segments.

D101 is composed, the segment poles D1 01 are fixed and insulated from each other by the insulating fixing member D102, and the outer side surfaces of the conductive poles D101 of each segment have the same lateral shape and size, and are graded by the segment located inside the segment pole D101. Lead D1 03 is electrically coupled to signal and data processing unit D5.

The outer side of the first electrode D1 is wrapped with a uniform insulating layer D104 for isolating the segment D1 01 from the measured medium, and at the same time, does not cause distortion of the measuring signals of the segments.

The second electrode D2 is adjacent to the first electrode D1 in the vertical direction, and is located between the first electrode D1 and the second electrode D2. The space in which the medium can freely enter and exit is the measurement space of the sensor, and is electrically conductive opposite to the first electrode D1. On one side, the second electrode D2 has the same horizontal structure and uniform size at each height, and has a channel for facilitating the entry and exit of the medium into and out of the measurement space, and is electrically connected to the signal and data processing unit D5 as a whole.

In the combined aqueous measuring apparatus of the present invention, in the horizontal direction, the second electrode D2 partially or completely surrounds the first electrode 1; in a vertical relationship, the first electrode D1 and the second electrode D2 are parallel to each other. The first electrode D1 and the second electrode D2 are isolated and fixed together by the isolating insulating member D4 to form the detecting pole of the sensor, that is, the upper ends of the first electrode 1 and the second electrode 2 pass through the isolating insulating head 401, and the lower end is isolated by the isolating insulating plug 402. fixed.

The signal and data processing unit D5, the detector pole of the sensor, the electrical protection shell The bodies D6 and the like are connected together by the support connecting body D3.

The second electrode D2 provided in the present invention may be formed by at least one tubular or rod-shaped electric conductor having the same lateral structure and vertically parallel to the first electrode D1, and a plurality of tubular or rod-shaped electric conductors D2 passing through the connecting member. D202 is connected together, in the horizontal direction, the second electrode portion or completely surrounds the first electrode; or a cylindrical structure with side-opening holes may be used, and the opening is ensured in a manner to ensure the second electrode and the first electrode The structure and area of the opposite portions of each segment should be substantially uniform. The second electrode D2 is electrically connected to the signal and data processing unit D5 as a whole via the second electrode lead D201.

The advantage of forming the second electrode in a tubular or rod-like parallel configuration is that the tubular or rod-shaped electrode surface is easy to handle, and it is ensured that each tubular or rod-shaped electrode has no convexity that blocks the movement of the medium in the vertical direction of the measurement section. Out of point, thus minimizing the impact of the hanging material; this is of great significance in measuring crude oil emulsions with higher viscosity.

The multi-phase mixed medium in a stable or balanced state in the separation tank is distributed in a layered state, which is a prerequisite for the technical solution proposed by the present invention. The respective segments of the first electrode D1 are D1 01 and The opposite part of the second electrode D2 constitutes a segment sensor or an aqueous measuring probe. The electrical signals, such as capacitance, impedance, etc., which are measured by the respective segment sensors and the corresponding segment signal measuring circuit 105, are different in nature and size. The signal and data processing unit 5 determines the nature of the dielectric layer in which it is located according to the difference of the electrical signals transmitted by the segment D101, and further derives its water content, which requires the signal of each segment of the sensor and the dielectric layer in which it is located. The relationship is as large as possible, and the relationship with the adjacent dielectric layer is as small as possible. As shown in Fig. 6, it is demonstrated that the size of this relationship depends on the minimum distance d and the segment between the first electrode D1 and the second electrode D2. The ratio of the vertical height h of the polarization D101 is d/h, and the cylinder is called the width/height ratio d/h. The larger the width/height ratio d/h, the signal of the segment sensor corresponding to each dielectric layer is affected. phase Effects of the dielectric layer becomes greater, and vice versa, the influence by the adjacent dielectric layers is smaller. After a large number of experiments, considering the problem of the hanging of the sensor between the first electrode D1 and the second electrode D2, the minimum distance d between the two electrodes can not be too small, in general, the first electrode and the second electrode the distance between It should be smaller than the height h of the segment poles in the vertical direction. Preferably, the vertical height of each segment pole is between 10 and 400 mm, and the minimum distance d between the two electrodes is 5 to 300 mm. between.

The interval between the adjacent segments may be set to 0.3 匪, and the maximum shall not exceed the segment grading height.

The height of the segment pole D101 constituting the first electrode in the vertical direction can be selected according to the requirements of the measurement accuracy of the application. The height of each segment D101 can be theoretically different, but the preferred solution is the same. The height of the data, thus the processing of the data.

In the technical solution provided by the present invention, an outer insulating layer D104 for uniformly wrapping the first electrode D1 is provided, which functions to isolate the first electrode D1 from the possibly conductive medium to be measured, and reduce the assembled sensor. Process complexity. Its electrical influence is equivalent to a parasitic capacitive impedance component connected in series to the measured medium. According to the electronic principle, the result of the parasitic capacitance in series with the capacitive impedance of the measured medium is the smaller one. Advantages, because the relative dielectric constant of the measured medium containing water is generally large, generally greater than 3, therefore, compared with this parasitic capacitance, the capacitive impedance of the measured medium is relatively large, in order to reduce this parasitic capacitance The thickness of the outer insulating layer D104 should be as thin as possible, such as a thickness of less than 1.5 mm; or, although the thickness of the outer insulating layer D104 is large, the relative dielectric constant of the insulating material used is larger. For example, if rubber, doped barium titanate epoxy resin, plastic, etc., the relative dielectric constant is greater than 3, in order to increase the capacitive impedance of the outer insulating layer as much as possible, thereby minimizing the influence of parasitic impedance. . It is also possible to use a material having a dielectric constant of less than 3, as the case may be. For example, in one embodiment, a material having a dielectric constant of 2, a polytetrafluoroethylene, is used.

The specific process of providing the outer insulating layer D1 04 may be completely coated with a uniform insulating layer on the surface of the first electrode D1 by spraying or injection molding; The first electrode D1 is fitted with a well-distributed and insulated hook tube, which is placed on the first electrode, and the nozzle is subjected to necessary sealing measures. One embodiment of the present invention employs a fluoroplastic film having a thickness of only 0.3 mm and a relative dielectric constant of less than 3 as the outer insulating layer D1 04, which is closely attached to the outside of the first electrode by injection molding.

Another embodiment of the present invention employs a ceramic tube having a thickness of 2.5 mm, but a relative dielectric constant of up to 30, as an outer insulating layer D1 04, which is disposed on the outer side of the first electrode by a tight fit, the nozzle Sealed with a sealant.

Different thicknesses of insulating film can be used depending on the material. For example, in one embodiment, a 3 inch insulating film is used.

The outer insulating layer D10 of the present invention may also be a rubber tube or a plastic tube which is disposed on the outer side of the first electrode in a tightly fitting manner.

The second electrode D2 provided in the present invention may be formed by connecting at least one tubular or rod-shaped electrical conductor parallel to the first electrode 1 in parallel, as shown in FIG. The rod-shaped electrical conductors 2 are connected together by a connecting member 202. In the horizontal direction, the second electrode portion completely surrounds the first electrode; a cylindrical structure with uniform side opening may also be adopted, and the opening manner is ensured. The structure and area of the portions of the two electrodes that are opposite to each of the segments on the first electrode should be substantially uniform. The second electrode D2 is electrically connected to the signal and data processing unit D5 as a whole via the second electrode lead D201.

The advantage of forming the second electrode in a tubular or rod-like parallel configuration is that the tubular or rod-shaped electrode surface is easy to handle, and it is ensured that each tubular or rod-shaped electrode has no convexity that blocks the movement of the medium in the vertical direction of the measurement section. Out of point, thus minimizing the impact of the hanging material; this is of great significance in measuring crude oil emulsions with higher viscosity. Supplementary note 1. A method for measuring the oil content of an oil well produced liquid, characterized in that: the oil well produced liquid is input into a vertical separation tank through an input pipeline, and after separating the gas and liquid in the separation tank, the separation tank body is separated. The upper part forms a gas layer, and the gas is sent outside the upper gas output line, and the liquid is collected in the separation tank which is closed by the liquid discharge valve, and the oil and water is settled and layered to form an emulsified oil layer in the middle of the separated tank body and a free water layer located in the lower part. Provided through the separation tank The liquid level meter measures the liquid level in the tank; after the liquid level reaches the required height, the oil well input liquid input time T is recorded; at different prescribed heights in the vertical direction of the separation tank, a plurality of oil and water component measuring instrument probes are installed, each The probe measures the oil content of the liquid layer in which it is located, and sets the intermediate level of the adjacent probe as the upper or lower interface of a liquid layer. According to the structural size of the separation tank and the installation setting of the probe, the thickness of the liquid layer of each probe is determined. The horizontal cross-sectional area Si is calculated, and the oil volume volume V _i of the liquid layer in each probe is calculated, and the oil content volume of each liquid layer of each probe is added, and the oil production volume V oil of the oil well in time T is obtained.

Supplementary note 2: An oil well production liquid oil content measuring device, comprising a vertical separation tank, wherein an oil well production liquid input line, a liquid output line, and a gas are respectively arranged at an upper portion, a lower portion and a top portion of the separation tank The output pipeline is provided with an inlet valve, a drain valve and an exhaust valve respectively in the oil production liquid input pipeline, the liquid output pipeline and the gas output pipeline; and the liquid level for monitoring the liquid surface is also arranged on the separation tank The instrument is characterized in that: a plurality of oil-water component measuring instrument probes are installed at different prescribed heights in the vertical direction of the separating tank.

Supplementary note 3, wherein the oil well production liquid oil content measuring device according to the second aspect is characterized in that: the transverse cross-sectional area of the middle portion of the separation tank body is 5% of the transverse cross-sectional area of the lower portion of the separation tank body to 80%.

Supplementary note 4. The oil well production liquid oil content measuring device according to the supplementary note 2, wherein: the oil-water component measuring instrument probe side is mounted on the separation tank.

Supplementary note 5. The oil well production liquid oil content measuring device according to the supplementary note 2, wherein: the oil-water component measuring instrument probe is mounted on the separation tank.

Supplementary note 6. The oil well production liquid oil content measuring device according to the supplementary note 2, wherein: the oil-water component measuring instrument probe and the liquid level meter are integrated into one body.

Supplementary note 7, the oil well production liquid oil content measuring device according to the supplementary note 2, characterized in that: on the gas output line, a gas flow meter can also be provided for measuring the gas production of the oil well in the agreed time period, Realize three-phase metering of oil, water and gas.

Supplementary note 8, the oil well production liquid oil content measuring device according to the supplementary note 2, characterized in that: It is provided with a data analysis and control unit, and the data analysis and control unit is electrically connected to each measuring instrument and electric control valve installed on the separation tank.

Supplementary note 9, the oil well production liquid oil content measuring device according to the supplementary note 2, wherein the side wall of the middle portion of the separation tank body is respectively provided at a position corresponding to the plurality of oil-water component measuring instrument probes Corresponding sampling lines are provided with corresponding valves on each sampling line.

Supplementary note 10, the oil well production liquid oil content measuring device according to the supplementary note 1, characterized in that an electronic display capable of displaying the moisture content or the oil content of each oil and water layer is provided by electrically connecting with the oil and water component measuring instrument probes. .

Supplementary note 11. The oil well production liquid oil content measuring device according to the supplementary note 1, characterized in that a liquid flow meter is arranged on the liquid output line.

Supplementary note 12. The oil well production liquid oil content measuring device according to the supplementary note 9 is characterized in that an on-line oil-water component measuring instrument connected in series with the liquid flow meter is further disposed on the liquid output line.

Supplementary note 13. The oil well production liquid oil content measuring device according to the supplementary note 1 is characterized in that a mass flow meter is arranged on the liquid output line.

Supplementary note 14. The oil well production liquid oil content measuring device according to the supplementary note 1 is characterized in that a liquid discharging pump is arranged on the liquid output line.

Supplementary Notes 15. - Method for measuring the oil content of oil production fluids, including:

The oil content of each liquid layer is measured using an oil-water component measuring instrument probe; The oil content of the volume corresponding to the plurality of liquid layers is obtained based on the measured oil content of each of the liquid layers and the volume of each of the predetermined liquid layers.

Supplementary note 16, the method of Appendix 15, further comprising: measuring the liquid level in the tank by a liquid level meter provided on the separation tank; after the liquid level reaches the required height, recording the oil well production liquid input time T; At different heights in the vertical direction of the tank, a plurality of oil-water component measuring instrument probes are installed, each probe measures the oil content of the liquid layer in which the liquid layer is located, and the middle surface of the adjacent probe is set as the upper or lower interface of a liquid layer, according to Determine the structural size of the separation tank and the installation settings of the probe, determine the thickness of the liquid layer and the horizontal cross-sectional area Si of each probe, calculate the oil volume V _i of the liquid layer where each probe is located, and add the oil volume of the liquid layer of each probe. And the method of the method of claim 15, wherein the height of each of the plurality of liquid layers is equal.

The method of claim 15, wherein the height of the oil-water component measuring instrument probe is substantially equal to the height of each of the liquid layers.

Supplementary note 19. The method of Annex 15, wherein the separation tank comprises:

An upper portion having a first height and a first transverse cross section;

a central portion having a second height and a second transverse cross section, and

a lower portion having a third height and a third transverse cross section;

Wherein, according to the approximate ratio of water and oil of the multiphase mixed medium, the ratio of the second height of the middle portion, the third height of the lower portion, and the second transverse section of the middle portion and the third transverse section of the lower portion are set. proportion.

Supplementary note 20. The method of claim 19, wherein the area of the second transverse section of the central portion is smaller than the area of the third transverse section of the lower portion.

Supplementary note 21. The method of claim 19, wherein the area of the second transverse section of the central portion is smaller than the area of the first transverse section of the upper portion. Supplementary note 22. The method of claim 19, wherein the transverse cross section comprises a circular cross section.

The above description of the present invention is not intended to be exhaustive, and the invention is not limited to the precise forms disclosed. Those skilled in the art will appreciate that various equivalent modifications and alterations are possible within the scope of the invention, and such modifications and substitutions are considered to be encompassed by the invention. The elements of the various embodiments described above can be combined arbitrarily to provide further implementations. In addition, the terms used in the appended claims are not to be construed as limiting or limiting the invention to the particular embodiments disclosed herein. Therefore, the actual scope of the invention should be construed as being

Claims

Rights request

A method for measuring the oil content of an oil production fluid, comprising: inputting an oil production fluid through an input pipeline into a vertical separation tank for agglomeration and stratification of oil and water to form an emulsified oil layer in the middle of the separation tank; And a free water layer located at the lower portion; dividing the liquid volume in the separation tank into a plurality of liquid layers in the horizontal direction in a vertical direction, the volume of each liquid layer being preset; using the oil-water component measuring instrument probe for each The oil content of the liquid layer is measured; the oil content of the volume corresponding to the plurality of liquid layers is obtained based on the measured oil content of each of the liquid layers and the volume of each of the predetermined liquid layers.

2. The method of claim 1 further comprising: measuring the level of the liquid level in the tank by means of a liquid level meter provided on the separation tank; after the liquid level reaches the required height, recording the input time T of the oil well produced liquid; At different heights of the direction, a plurality of oil-water component measuring instrument probes are installed, each probe measures the oil content of the liquid layer in which the probe is located, and sets the intermediate surface of the adjacent probe to be the upper or lower interface of a liquid layer, according to the separation tank The structural size and the installation setting of the probe, determine the thickness of the liquid layer in each probe, the horizontal cross-sectional area Si, calculate the oil volume V _i of the liquid layer in each probe, and add the oil volume of each liquid layer of the probe. The volume of oil produced by the oil well in time T

3. The method of claim 1 wherein said separation tank comprises:

An upper portion having a first height and a first transverse cross section;

a lower portion having a third height and a third transverse cross section;

Wherein, according to the approximate ratio of water and oil of the multiphase mixed medium, the second height of the middle portion, the ratio of the third height of the lower portion, and the second transverse cross section of the middle portion are set, The ratio of the third transverse section of the lower portion.

The method of claim 3, wherein the area of the second lateral cross section of the middle portion is smaller than the area of the third transverse cross section of the lower portion.

5. - Oil well production liquid oil content metering device, comprising a vertical separation tank, respectively, an oil well production liquid input line, a liquid output line, a gas output line are respectively arranged at the upper part, the lower part and the top part of the separation tank , an oil inlet valve, a liquid outlet pipe and a gas outlet pipe are respectively provided with an inlet valve, a drain valve and an exhaust valve; wherein: the separation tank is at a different predetermined height in a vertical direction, Multiple oil and water component meter probes are installed.

6. The well production fluid content metering apparatus of claim 5, wherein said separation tank comprises:

An upper portion having a first height and a first transverse cross-sectional area;

a middle portion having a second height and a second transverse cross-sectional area, and

a lower portion having a third height and a third transverse cross-sectional area;

Wherein, according to the approximate ratio of water and oil of the multiphase mixed medium, the ratio of the second height of the middle portion, the third height of the lower portion, and the second transverse cross-sectional area of the middle portion and the third horizontal cross section of the lower portion are set. The proportion of the area.

7. The oil well production liquid oil content metering apparatus according to claim 5, wherein: said separation tank has a second transverse cross-sectional area of 5% to 80% of said third transverse cross-sectional area.

8. The oil well production liquid oil content metering device according to claim 5, wherein: said oil-water component measuring instrument probe side is mounted on said separation tank.

9. The oil well production liquid oil content metering device according to claim 5, wherein: said oil-water component measuring instrument probe is mounted on said separation tank.

10. The oil well production liquid oil metering device of claim 5, further comprising a liquid level meter disposed on the separation tank for measuring the liquid level in the tank.

11. The oil well production liquid oil content metering device according to claim 10, wherein: the oil-water component measuring instrument probe is integrated with the liquid level meter.

12. The oil well produced liquid oil content measuring device according to claim 5, wherein: A data analysis and control unit is provided, and the data analysis and control unit is electrically connected to each measuring instrument and the electric control valve installed on the separation tank.

13. The oil well production liquid oil content metering device according to claim 5, wherein a corresponding sampling tube is respectively disposed at a position corresponding to a plurality of oil-water component measuring instrument probes on a side wall of the separating tank body. The road has corresponding valves on each sampling line.

14. The oil well produced liquid oil content metering apparatus according to claim 5, wherein a liquid flow meter is disposed on said liquid output line.

The oil well produced liquid oil metering apparatus according to claim 5, wherein a discharge pump is provided on said liquid output line.