Constant pressure metering device for nuclear production of oil well yield

Abstract

The utility model discloses a constant pressure metering device for nuclear production of oil well yield, which comprises a metering tank, the bottom of the metering tank is supported on a bedplate of an electronic scale, the electronic scale is arranged on a movable cart, the side wall of the middle lower part of the metering tank is connected with a metering liquid inlet pipe, and the outer end of the metering liquid inlet pipe is provided with a metering liquid inlet valve. The center of the bottom of the metering tank is connected with a drain valve, and an outlet of the drain valve is connected with a drain pipe; the top of the metering tank is connected with a four-way connector, an upper port of the four-way connector is connected with a pressure gauge through a plug valve, and a pressurizing quick connector is mounted at a port on one side of the four-way connector and connected with an outlet valve of a nitrogen cylinder through a high-pressure hose. An inlet of the metering liquid inlet valve is connected with an outlet of the wellhead sampling gate through a metering hose. And an outlet of the liquid discharge pipe is connected with an inlet of the wellhead back-pressure gate. The device can improve the accuracy of current single well metering, reduce the labor intensity of operators, shorten the oil well metering time, and meet the requirements of safety and environmental protection.

Description

Technical Field

[0001] The utility model relates to an oil well metering device, a constant pressure metering device for oil well production verification, belongs to the technical field of oil field metering equipment, and is used for a single person to conduct real-time production verification of oil well production. Background Art

[0002] The determination of single well liquid production is an important task in the daily management of oil wells. By observing the changes in liquid production, we can understand the working conditions of the oil well formation and pump pipe. Traditionally, oil well production is measured by metering separators. With the change of oil gathering process, metering rooms are gradually dismantled. Currently, only a very small number of oil wells can use separators to measure oil, accounting for about 1% of the total number of oil wells.

[0003] At present, the production of oil wells is mainly measured by the area integration of the dynamometer chart. The real-time production integration of the dynamometer chart plays a convenient and fast role in the working conditions of the pump pipe and rod of the oil well and the measurement of pump efficiency. In particular, the analysis of the changes in the work area of ​​the dynamometer chart in different time periods to compare the production, pump condition, and load changes are mature technologies. The dynamometer chart measurement method can intuitively compare the changes in oil well production and analyze the production status of the oil well, but the actual production of the oil well is affected by the following factors: changes in suction parameters, whether the oil well has self-flowing ability, changes in high-pressure physical parameters, tubing leakage, sand wax gas effects, load meter failure, etc., which makes the actual production and dynamometer chart measurement production have a large deviation. In the actual production of oil well production fluctuations, well production verification, new well commissioning, peripheral edge oil well measurement, block production survey, etc., the dynamometer chart production is mainly used as a reference to compare the stage time. The accurate measurement of oil well production still relies on the volumetric method and flow meter for on-site verification and measurement.

[0004] There are two types of oil well production metering vehicles at the production site, both of which are tricycle-mounted metering devices. One is a square volume tank with electric heating, with a volume of 1m³, equipped with a pump, a heating rod, safety accessories, etc. After the liquid is filled, the weight of the whole vehicle exceeds 1.3 tons, which is large in size and heavy in weight; it is time-consuming and labor-intensive, and the production price is high. A horizontal scale is provided at the bottom of the square volume tank, and the oil well production is converted by the mass of oil entering the tank within a certain period of time. The other is a gas-liquid two-phase metering device, and the oil well production volume is obtained by the mass flow meter of the degassed crude oil. Both metering devices have the disadvantages of large volume and weight, more metering preparation work, long single metering time, high explosion-proof safety requirements, high personnel configuration requirements, high failure rate, and high single price (>50,000 yuan) in field applications. In addition, the average single well metering time during the on-site metering process is more than 20 minutes, and the operation intensity is high. Considering that crude oil is easy to solidify and adhere to the inner wall of the container and process, explosion-proof heating rods and winding electric heating devices are installed, which need to be connected to a 380V, 15KW heating power supply. Due to the complex design, many leakage points in the device and high safety requirements, the metering device needs to be miniaturized, easy to carry, safe, and convenient and accurate in measurement.

[0005] On-site operators also use the method of draining fluid from the wellhead into a volumetric barrel for sampling and weighing measurement. Since the sampling gate of the wellhead process is opened and the oil fluid flows into an open container, there is instantaneous pressure relief. The pressure difference between the wellhead backpressure and the container is 0.4 - 0.7 MPa, which causes a large error in measurement and is greatly affected by human operation. In addition, the residual fluid after sampling cannot be recycled, resulting in waste, increasing the cost of solid waste treatment and the operation intensity of employees. Summary of the Invention

[0006] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, but such simplifications or omissions shall not be used to limit the scope of the present invention.

[0007] In view of the above and / or problems existing in the prior art, the present invention is proposed.

[0008] The purpose of the present invention is to overcome the problems existing in the prior art, provide a constant-pressure metering device for oil well production verification, improve the accuracy of current single-well metering, reduce the labor intensity of operators, reduce the oil well metering time, and meet the requirements of safety and environmental protection.

[0009] To solve the above technical problems, a constant-pressure metering device for oil well production verification of the present invention includes a metering tank. The bottom of the metering tank is supported on the platform of an electronic scale, and the electronic scale is placed on a mobile trolley. A metering inlet pipe is connected to the middle and lower side wall of the metering tank. A metering inlet valve is provided at the outer end of the metering inlet pipe. The center of the bottom of the metering tank is connected with a drain valve, and the outlet of the drain valve is connected with a drain pipe. The top of the metering tank is connected with a four-way joint. The upper port of the four-way joint is connected with a pressure gauge through a stopcock valve. An inflation quick connector is installed at one side port of the four-way joint, and the inflation quick connector is connected with the outlet valve of a nitrogen cylinder through a high-pressure hose.

[0010] As an improvement of the present invention, the inner end of the metering inlet pipe turns downward and extends. A baffle plate is welded to the inner wall of the metering tank, and the end of the baffle plate slopes downward and covers the upper part of the metering inlet pipe.

[0011] As a further improvement of the present invention, a vent valve is installed at the other side port of the four-way joint.

[0012] As a further improvement of the present invention, the inlet of the metering inlet valve is connected with the outlet of the wellhead sampling gate through a metering hose and a wellhead sampling joint.

[0013] As a further improvement of the present invention, the outlet of the drain pipe is connected with the inlet of the wellhead backpressure gate.

[0014] As a further improvement of the utility model, an external tank heating unit is wrapped around the outer circumference of the metering tank.

[0015] As a further improvement of the utility model, the top of the metering tank is also connected to a quick pressure relief valve and a constant pressure valve.

[0016] As a further improvement of the utility model, the electronic scale is provided with a TR200H weighing transmitter module, the power modules of the TR200H weighing transmitter module, the PLC controller and the touch screen HMI are respectively connected to a 24VDC power supply, the normally open contact of the start recording button SB1 is connected between +24VDC and the 1M0 port of the PLC controller, and the normally open contact of the stop recording button SB2 is connected between +24VDC and the 1M1 port of the PLC controller; the weighing signal A+ port of the TR200H weighing transmitter module is connected to the AIO+ port of the PLC controller, and the weighing signal A- port of the TR200H weighing transmitter module is connected to the AIO- port of the PLC controller.

[0017] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. The device realizes the miniaturization of the oil well metering device, with a small volume. Excluding the nitrogen pressurization part, it is a whole that can be moved as a whole, with a total mass of 30KG, which is easy to carry. A single person can carry and transport it with a small cart without the need for a carrier. The production cost is low, the functions are complete, and a single person can operate it with simple training; it solves the problem of complex operation and high manpower consumption of the original on-site metering device, and increases the single well metering time rate by >50%.

[0018] 2. The metering principle adopts constant pressure volumetric metering, and the pressure is kept constant during the setting out process to achieve constant pressure setting out and metering of oil well production. The production metering eliminates the influence of pressure difference; the mass of oil entering the container per unit time is converted into the daily production of the oil well, eliminating or reducing the metering deviation caused by the pressure difference change. All control valves are fast-opening ball valves to ensure fast opening and closing, further reducing the errors related to the metering process, making the final metering error <5%, ensuring the metering accuracy. Real-time association between weight data and timer data is achieved, and the oil well production is displayed in real time after accumulation.

[0019] 3. This device is not a pressure vessel, its volume is less than 25L, and its pressure resistance is 1.0MPa. No special management is required. The outer periphery of the container is wrapped with a 36-220V electric heating belt according to demand, and a temperature controller is provided to facilitate measurement in low temperature weather; the operation process uses safe voltage operation, and no additional power supply is required, which is safe and guaranteed.

[0020] 4. The inner wall of the container is coated with Teflon to reduce the adhesion of crude oil and facilitate self-cleaning inside the container. The metering container is equipped with an automatically adjustable pressure relief valve, a constant pressure valve, and a small-flow exhaust valve. Before use, nitrogen is filled into the container to the specified pressure. High-pressure nitrogen is used to provide the displacement gas to quickly recover the oil in the container into the casing, making the oil recovery safe and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. The drawings are only for reference and explanation, and are not used to limit the present invention. Among them:

[0022] Figure 1 is a schematic structural diagram of the constant pressure metering device for oil well production verification of the present invention;

[0023] Figure 2 is the power circuit diagram of the constant pressure metering device for oil well production verification of the present invention;

[0024] Figure 3 is the control circuit diagram of the constant pressure metering device for oil well production verification of the present invention;

[0025] In the figure: 1. metering tank; 2. metering hose; 3. metering inlet valve; 4. metering inlet pipe; 5. liquid baffle; 6. drain valve; 7. drain pipe; 8. pressure charging quick connector; 9. vent valve; 10. quick pressure relief valve; 11. constant pressure valve; 12. electronic scale; 13. mobile trolley; 14. nitrogen cylinder; 15. wellhead sampling joint. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In the following description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating that the device must have a specific orientation.

[0027] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model pertains. The terms used herein in the description of the utility model are for the purpose of describing specific embodiments only and are not intended to limit the utility model.

[0029] As Figure 1 shown, the constant-pressure metering device for oil well production verification of this utility model includes a mobile weighing part, a metering volume part, a nitrogen pressurization part, a pressure regulating and relieving instrument part, a heating part, and a calculation operation display part. Specifically, it includes a metering tank 1, an electronic scale 12, a mobile trolley 13, and a nitrogen cylinder 14. The bottom of the metering tank 1 is supported on the platen of the electronic scale 12, and the electronic scale 12 is placed on the mobile trolley 13. A metering liquid inlet pipe 4 is connected to the middle and lower side wall of the metering tank 1. A metering liquid inlet valve 3 is provided at the outer end of the metering liquid inlet pipe 4. The bottom center of the metering tank 1 is connected with a drain valve 6. The outlet of the drain valve 6 is connected with a drain pipe 7, and the outlet of the drain pipe 7 is connected with the inlet of the wellhead backpressure gate.

[0030] The top of the metering tank 1 is connected with a four-way joint. The upper port of the four-way joint is connected with a pressure gauge through a stopcock valve. A pressure charging quick joint 8 is installed at one side port of the four-way joint. The pressure charging quick joint 8 is connected with the outlet valve of the nitrogen cylinder 14 through a high-pressure hose. A vent valve 9 is installed at the other side port of the four-way joint. During the metering and weighing process, if there is a misoperation, the vent valve 9 can be opened for discharging. The opening degree of the vent valve 9 can also be adjusted to keep the pressure in the tank stable.

[0031] The top of the metering tank 1 is also connected with a quick pressure relief valve 10 and a constant pressure valve 11. When the pressure in the tank is higher than the working pressure and exceeds the set value, the quick pressure relief valve 10 automatically opens for pressure relief to ensure safety. The constant pressure valve 11 functions as a safety valve. The set pressure is higher than that of the quick pressure relief valve 10 and lower than the design pressure of the metering tank 1, providing double protection in case the quick pressure relief valve 10 fails to open or fails to relieve pressure.

[0032] The inner end of the metering liquid inlet pipe 4 turns downward and extends. A liquid baffle 5 is welded to the inner wall of the metering tank 1. The end of the liquid baffle 5 slopes downward and covers the upper part of the metering liquid inlet pipe 4 to reduce the liquid level fluctuation in the metering tank 1.

[0033] The inlet of the metering liquid inlet valve 3 is connected with the outlet of the wellhead sampling gate through a metering hose 2 and a wellhead sampling joint 15.

[0034] The outer periphery of the metering tank 1 is wound with an external tank heating unit. Especially in winter, heating by the external tank heating unit can reduce the adhesion of crude oil to the inner wall of the metering tank 1.

[0035] The metering tank 1 is not a pressure vessel within the scope of special equipment management, and is equipped with triple protection of a rapid pressure relief valve 10, a constant pressure valve 11, and a vent valve 9 to ensure no overpressure. The inner wall of the metering tank 1 is attached with Teflon material, which has the characteristics of corrosion resistance, high temperature resistance, extremely low friction coefficient, and non-stickiness, greatly reducing the adhesion of crude oil to the inner wall.

[0036] The nitrogen cylinder 14 pressurized with nitrogen to the designed pressure of 40 MPa is shared with the wellhead liquid level gauge test for this nitrogen cylinder 14, and nitrogen quick connection charging and pressure release are adopted to ensure the pressure value in real time.

[0037] A 10L high-pressure nitrogen cylinder can complete the metering work of 30 wells, and the nitrogen cylinder can be inflated independently.

[0038] The electronic scale 12 is equipped with a data output interface and a touch screen HMI; the outer cylinder of the metering container is made of a steel cylinder with a diameter of 30 cm and a volume of 25L. Inside it, there is an inclined liquid baffle 5 above the liquid inlet pipe to reduce the impact of the oil liquid. The inner wall of the barrel has a corrosion-resistant coating, and the outer wall is wrapped with a heating unit; in the working state, a dual protection is formed by the rapid pressure relief valve 10 and the constant pressure valve 11 to prevent the container from exceeding the set pressure; and the pressure in the tank is kept constant and close to the back pressure in the casing through the adjustment of the vent valve 9; the vent valve 9 realizes manual exhaust during the liquid inlet metering process; the operation display part receives the real-time signals of weight change and clock, integrates them into the real-time output (tons), which is displayed on the display screen, and manual timing can also be started for timing and weighing metering.

[0039] On-site installation of this device:

[0040] The inlet end of the liquid inlet pipe is connected to the wellhead sampling gate through the wellhead sampling joint 15, the drain pipe 7 is led into the oil well casing, the electronic scale 12 at the bottom of the metering tank 1 is laid flat, nitrogen is introduced after setting the container pressure, the wellhead back pressure gate is closed, and the wellhead sampling gate is opened to start metering.

[0041] The metering working principle of this device:

[0042] This device is a volumetric metering device. When the working cylinder is metering, it maintains a certain constant pressure, simulates the back pressure of 0.2 - 0.6 MPa in the oil well, realizes constant pressure metering, and eliminates the problem of large metering errors caused by the pressure difference of liquid discharge.

[0043] The metering unit of this device consists of an electronic scale (kg) at the bottom and a time timer (s'). After the oil liquid enters the working cylinder of the container, press the start button, the weight unit is cleared to start weighing, the time is timed in seconds, after reaching a certain weight, press the stop record button, and the weighing device displays the liquid weight and timing time during the start-stop time period; at the same time, the daily output (tons) of this well is displayed on the display interface.

[0044] A calculation formula is embedded in the calculation and display unit to calculate the weight of oil per unit time, and after conversion, the measured output of the oil well is displayed in real time on the display screen.

[0045] For example: the incoming liquid mass is 13.5 kg, the timing time is 75 seconds, the number of seconds per day is 86400 seconds, and the daily production of the well = 86400÷75×13.5 / 1000 = 15.55 tons.

[0046] like Figure 2 , Figure 3 As shown, the control power supply circuit is equipped with a main circuit breaker QFM and a power switch SA1. The input end of the switch power supply V1 is connected to the control power supply circuit, and the output end of the switch power supply V1 outputs a DC 24V voltage. The power modules of the PLC controller, touch screen HMI and weighing transmitter module TR200H are respectively connected to a DC 24V power supply to transmit electronic scale signals and power the operation display panel.

[0047] The electronic scale is equipped with a TR200H weighing transmitter module. The normally open contact of the start recording button SB1 is connected between +24VDC and the 1M0 port of the PLC controller, and the normally open contact of the stop recording button SB2 is connected between +24VDC and the 1M1 port of the PLC controller; the weighing signal A+ port of the TR200H weighing transmitter module is connected to the AIO+ port of the PLC controller, and the weighing signal A- port of the TR200H weighing transmitter module is connected to the AIO- port of the PLC controller.

[0048] The PLC controller uses Siemens ST20, which receives the weight change signal of the electronic scale, the 4-20 mA current signal or the 0-10 V voltage signal of the external sensor. According to the set time parameters, the timing operation or manual timing operation is performed, the oil quality change and the time relationship variable are integrated, and the oil well production data is obtained and displayed on the display screen. It can realize the digital display of real-time production and switch between automatic measurement and manual measurement.

[0049] Wellhead nuclear production preparation work:

[0050] Move the metering device to the wellhead, find a flat ground, make the bottom plate of the metering tank 1 close to the electronic scale, connect the wellhead sampling connector 15 of the metering hose 2 to the wellhead sampling gate and open the metering liquid inlet valve 3; check that the pressure relief valve and the constant pressure valve 11 are in the open state, and the vent valve 9 and the drain valve 6 are in the closed state; connect the nitrogen bottle to the charging quick connector 8, and open the nitrogen charging according to the wellhead back pressure to a value close to the wellhead back pressure, usually <0.6MPa.

[0051] Wellhead nuclear production measurement process:

[0052] Close the wellhead backpressure gate, open the wellhead sampling gate, and let the oil enter the metering container. You can manually click "tare" on the operation panel of the electronic scale to start timing and metering, with the inlet liquid mass controlled at 20 kg. You can also press "automatic" on the operation panel for real-time metering and real-time display of the output. After reaching the specified weight, close the wellhead sampling gate and open the wellhead backpressure gate.

[0053] Drainage and pressure relief process:

[0054] Place the drain pipe 7 into the casing gate, open the drain valve 6, and under the action of the container pressure, drain the oil into the oil well casing. When the temperature is relatively low, the external heating unit outside the tank can be connected in advance for preheating to melt the small amount of crude oil adhering to the inner wall of the tank.

[0055] Then move to the next oil well to start metering.

[0056] The above is only a preferred and feasible embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. It is not intended to limit the patent protection scope of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Except for the above embodiments, without departing from the spirit and scope of the present invention, the present invention can have other implementation manners. The present invention will also have various changes and improvements. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention. The protection scope required by the present invention is defined by the appended claims and their equivalents. The technical features not described in the present invention can be achieved by or adopted from the prior art, and will not be elaborated here.

Claims

1. A constant pressure metering device for oil well production nuclear production, comprising a metering tank, characterized in that: The bottom of the metering tank is supported on the table of the electronic scale, and the electronic scale is placed on a mobile cart. The middle and lower side walls of the metering tank are connected with a metering liquid inlet pipe, and the outer end of the metering liquid inlet pipe is provided with a metering liquid inlet valve. The bottom center of the metering tank is connected with a drain valve, and the outlet of the drain valve is connected with a drain pipe; the top of the metering tank is connected with a four-way joint, and the upper port of the four-way joint is connected with a pressure gauge through a stopcock, and a side port of the four-way joint is installed with a pressurizing quick joint, and the pressurizing quick joint is connected to the outlet valve of the nitrogen bottle through a high-pressure hose.

2. The constant pressure metering device for oil well production verification according to claim 1 is characterized in that: The inner end of the metering liquid inlet pipe is bent and extends downward, and a liquid baffle is welded to the inner wall of the metering tank. The end of the liquid baffle is tilted downward and covers the top of the metering liquid inlet pipe.

3. The constant pressure metering device for oil well production verification according to claim 1 is characterized in that: A vent valve is installed at the other side port of the four-way joint.

4. The constant pressure metering device for oil well production verification according to claim 1 is characterized in that: The inlet of the metering liquid inlet valve is connected to the outlet of the wellhead sampling gate through a metering hose and a wellhead sampling joint.

5. The constant pressure metering device for oil well production verification according to claim 1 is characterized in that: The outlet of the liquid discharge pipe is connected to the inlet of the wellhead back pressure gate.

6. The constant pressure metering device for oil well production verification according to claim 1 is characterized in that: An external tank heating unit is wound around the outer circumference of the metering tank.

7. The constant pressure metering device for oil well production verification according to claim 1 is characterized in that: The top of the metering tank is also connected with a quick pressure relief valve and a constant pressure valve.

8. The constant pressure metering device for oil well production verification according to claim 1 is characterized by: The electronic scale is provided with a TR200H weighing transmitter module. The power modules of the TR200H weighing transmitter module, the PLC controller and the touch screen HMI are respectively connected to a 24VDC power supply. The normally open contact of the start recording button SB1 is connected between +24VDC and the 1M0 port of the PLC controller, and the normally open contact of the stop recording button SB2 is connected between +24VDC and the 1M1 port of the PLC controller; the weighing signal A+ port of the TR200H weighing transmitter module is connected to the AIO+ port of the PLC controller, and the weighing signal A- port of the TR200H weighing transmitter module is connected to the AIO- port of the PLC controller.

Images