CN201588624U - Mobile oil well single well metering device - Google Patents

Abstract

The utility model relates to a movable single well metering device used for an oil well. A buffer tank and a flow meter are respectively fixed at the upper part of a traveling car, and an outlet of the buffer tank is connected with the inlet of the flow meter through a pipeline; a check valve and a valve are respectively connected at the inlet of the buffer tank, and an inlet pipeline is connected to the valve at the inlet of the buffer tank; a valve is connected at the outlet end of the flow meter and connected with an outlet pipeline; and the flow meter is connected with a flow meter data display control instrument. The utility model has the benefits that oil pipelines at the wellhead of the oil well are rapidly connected, the mass flow of oil-gas-water three-phase mixed fluid is directly metered, and since the check valve and the gas-liquid buffer tank are respectively and additionally arranged at the inlet end of the flow meter, the fluid is prevented from reversely flowing in down stroke of the rod-pumped well, and the flow quantity of the fluid and the pressure fluctuation are both reduced, so as to ensure accurate metering; and the complete set metering device has the advantages of small size, light weight and wide measuring range, and is convenient to move after being skid-mounted on a lightweight jinrikisha or an electric tricycle.

Description

Mobile oil well single well metering device

technical field

The utility model relates to the technical field of oil production in oil fields, in particular to a metering device for a single oil well, which is a movable oil-gas-water three-phase mass flow metering device for oil wells with low gas content.

Background technique

Oil well single well production measurement can provide a basis for mastering oil well dynamics and formulating production measures scientifically. There are four main methods for conventional oil well production measurement: two-phase separation glass tube oil measurement, two-phase separation instrument oil measurement, three-phase separation instrument oil measurement or oil-gas-water non-separation measurement. Glass tube measuring oil is a traditional measurement method commonly used. The equipment is simple and the investment is small; continuous oil measurement cannot be realized, and the system error is large; two-phase separation instrument measurement realizes continuous oil measurement; the disadvantage is that the mass flowmeter is affected by factors such as installation, wax deposition and gas content, and the measurement accuracy is unstable ; The three-phase separation metering device is suitable for oil well metering in high water-cut period and extra-high water-cut period, which requires a lot of equipment and instruments, complex process, difficult operation and high maintenance cost; oil-gas-water non-separation metering occupies a small area, but a single Stage measurement accuracy and adaptability reliability are difficult to meet the requirements of production use.

After the reconstruction of the surface system in each oilfield, various process forms have been adopted for the oil wells: such as: ①mixed conveying with cold conveying process; ②cold conveying with mixed conveying process; ; ⑤Small-circle blending transportation; ⑥Small-string cold transportation process; The complexity of the process makes it difficult to accurately measure the dynamic data of a single well; it brings great difficulties to the division of production of a single well and the investigation of production wells that do not work hard; to complete the routine measurement work, some wells need to be stopped for measurement and investigation, which seriously affects Well uptime and crude oil production.

In oil well single well measurement, there are three factors that seriously affect the accuracy of oil well measurement:

The first is the impact of gas: most metering devices separate gas and liquid and measure them separately. The equipment used includes gas-liquid separator, gas flow meter and liquid flow meter. Not only the equipment investment is high, but also many equipment and instruments are required, and the process is complicated , The management operation is difficult, the maintenance cost is high, and the volume is large, so it is not suitable for use as a mobile device, and this gas-liquid separation changes the actual flow state of the fluid, which will cause changes in the production of the oil well, so the measured data will be different from the real production. There are certain deviations.

The second is that the oil well flow and pressure fluctuate greatly, resulting in inaccurate measurement of the flowmeter: in the production process of most oil wells, there are oil well flow fluctuations and pressure fluctuations, especially in pumping wells. This phenomenon is very obvious. The up and down strokes of the pump, the output and pressure are in a wave state, especially for wells with a low filling coefficient of the oil pump, they are in an irregular wave state, which causes a large error in measurement. Most flow meters, especially mass flow meters, require steady state pressure and flow. The greater the volatility, the higher the error.

The third is the problem of fluid backflow: during the downstroke of the pumping unit well, the packing of the sucker rod wears away due to friction after a period of use, and the sealing performance decreases, resulting in the fluid entering the wellhead device with the downstroke of the sucker rod. backflow, causing distortion of measurement results.

Utility model content

The purpose of this utility model is: to provide a mobile oil well single well metering device, which can directly measure the fluid quality of the single well output fluid, does not affect the normal production of oil wells on the same gathering and transportation ring, and meets the measurement accuracy requirements of the oil well metering standard ;The measured oil well production data can be directly displayed and storable; the on-site application is stable, safe, reliable, and environmentally friendly, meeting the needs of oilfield development and management.

The technical scheme adopted in the utility model is: a mobile single well metering device, mainly composed of a check valve, a buffer tank, a pressure gauge, a flow meter, a flow meter data display controller, a mobile trolley, a valve and a pipeline. A blowdown valve is fixed at the bottom, and a valve and a pressure gauge are fixed on the top of the buffer tank. It is characterized in that a buffer tank and a flow meter are fixed on the upper part of the mobile trolley, and there is a pipeline connection between the outlet of the buffer tank and the inlet of the flow meter. The inlet of the buffer tank is connected with a check valve and a valve, and the inlet pipeline is connected with the inlet valve of the buffer tank. The production fluid of a single well can enter the buffer tank through the inlet pipeline, check valve and valve. A valve is connected to the outlet end of the flowmeter, and an outlet pipeline is connected to the valve at the outlet end of the flowmeter. The flowmeter is connected with a flowmeter data display controller. The produced fluid in the buffer tank can flow into the flowmeter, and the flowmeter is used to detect and record the flow rate of a single well.

Before the measurement of each well, the device needs to be zeroed in the static state where the flowmeter is filled with liquid, so a bypass line is connected between the inlet pipeline and the outlet pipeline, and the valves on the inlet pipeline and the outlet pipeline are closed when the device is zeroed , and the valve of the bypass pipeline is opened, and the oil well fluid goes through the bypass pipeline.

In order to facilitate quick installation, a quick connector is connected to the other end of the inlet pipeline; a quick connector is connected to the other end of the outlet pipeline. Use quick connectors to quickly connect with matching insulation pipelines, saving installation time.

There is an air compressor on the mobile trolley. After each single well measurement, the fluid in the flowmeter can be purged to prevent the fluid from solidifying and waxing in the device, which will affect the accuracy of the next measurement.

The utility model uses a flow meter for accurately measuring the quality of the mixed fluid of oil, gas and water as the main body of measurement, and a check valve and a buffer tank are arranged upstream of the flow meter to prevent backflow of oil well fluid and suppress fluctuations in fluid pressure; the device consists of a primary meter and a secondary meter. The secondary meter consists of two parts. The primary instrument is mainly composed of check valve, buffer tank and flowmeter; the secondary instrument is mainly composed of signal transmitter and smart meter, which includes 430 single-chip microcomputer, intelligent processing software with automatic adjustment function, customized LCD display, Clock and memory, function keys, buzzer, TM card holder, battery, explosion-proof casing, etc.; the signal transmitter converts the instantaneous value of the fluid quality tested by the flowmeter into an electrical signal and sends it to the secondary instrument, which is completed by the secondary instrument Calculation, display, storage and playback of instantaneous and cumulative values of flow. The primary instrument and the secondary instrument are respectively installed in a box and fixed on a skid; the inlet and outlet of the device adopt quick connectors to quickly connect with the matching insulation pipeline. The device is equipped with an air compressor. After each single well measurement, the fluid in the flowmeter can be purged to prevent the fluid from solidifying and waxing in the device, which will affect the next use of the device and the measurement accuracy. The whole set of skid-mounted device is installed on a small battery car, which makes the device easy to move. If the range of oil wells to be measured is large, the skid-mounted device can be installed on a light car, which is more flexible and convenient to move.

The beneficial effects of the utility model:

1. The primary instrument adopts the measurement fluid quality, does not need oil, gas and water separation, is easy to use, and has a small device volume. 2. The measurement process is not affected by temperature, pressure, viscosity and density, and the measurement is accurate and the precision is high. 3. The power supply system of the primary instrument is powered by the battery device of the mobile system, and the power supply of the secondary instrument is powered by dry batteries or batteries, no external power supply is required, and it is easy to use. 4. Comes with a quick connector, which is very convenient to connect and disconnect with the wellhead valve of the oil well. Therefore, single well metering can be completed in a short time. 5. The self-provided air compressor can clean the fluid in the device and the pipeline at any time to avoid the solidification and wax deposition of the original flow in the device, and the blockage of impurities. 6. Skid-mounted structure, placed on a battery car or light car, easy to move. 7. The flow rate ranges from a few kilograms per hour to several hundred tons per hour, and the pressure level ranges from 0 to 32Mpa. It can form a series of products, which can be used for precision measurement in laboratories, and can also be used in mines and factories.

First of all, the non-separation measurement of oil, gas and water is applied, and the flow meter for measuring the mass of oil, gas and water three-phase mixed fluid is used as the main body of measurement, which can display instantaneous and cumulative average flow, small size and light weight. For most oil fields that have reached the middle and late stages of development, oil wells have high water cut, low gas volume, and low gas-liquid ratio, which is very beneficial to accurately measure the mass flow rate of oil-gas-water three-phase mixed fluid; secondly, check valves are installed upstream of the flowmeter, It is used to solve the problem of backflow in the downstroke of the pumping well fluid after entering the metering pipeline, so that the flowmeter will not appear backflow. A buffer tank is installed between the check valve and the flowmeter to slow down the fluid flow and pressure fluctuations; thus the flowmeter has high measurement accuracy.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the utility model mobile oil well single well metering device.

In the figure, 1. Inlet pipeline, 2. Check valve, 3. Buffer tank, 4. Pressure gauge, 5. Flowmeter, 6. Flowmeter data display controller, 7. Mobile trolley, 8. Valve, 9. Outlet pipeline.

Detailed ways

Embodiment 1: Taking a mobile single-well metering device as an example, the utility model is further described in detail.

See Figure 1. The utility model mobile single well metering device is mainly composed of a check valve 2, a buffer tank 3, a pressure gauge 4, a flow meter 5, a flow meter data display controller 6, a moving trolley 7, a valve 8 and a pipeline 1.

The buffer tank 3 is a vertical round tank with a volume of 2 liters. A blowdown valve 8 is fixed at the bottom of the buffer tank 3 , and two valves 8 and a pressure gauge 4 are fixed at the top of the buffer tank 3 . The model of the flow meter 5 is EMF-1. Mobile dolly 7 adopts storage battery car. A VEDA type air compressor is arranged on mobile trolley 7.

A buffer tank 3 and a flowmeter 5 are fixed on the top of the mobile trolley 7, and a pipeline 1 with a diameter of 65 mm is connected between the outlet of the buffer tank 3 and the inlet of the flowmeter 5. The inlet of the buffer tank 3 is connected with a DF-200 type check valve 2 and a manual valve 8 , and the inlet pipeline 1 is connected with the inlet valve 8 of the buffer tank 3 . A bypass pipeline is connected between the inlet pipeline 1 and the outlet pipeline 9, and a valve 8 is fixed on the bypass pipeline. The end of the inlet pipeline 1 is connected with a quick connector; the end of the outlet pipeline 9 is connected with a quick connector.

A valve 8 is connected to the outlet end of the flow meter 5 , and an outlet pipeline 9 is connected to the valve 8 at the outlet end of the flow meter 5 . The flowmeter 5 is connected with a flowmeter data display controller 6 .

Claims (4)

1. A mobile oil well single well metering device, mainly composed of a check valve (2), a buffer tank (3), a pressure gauge (4), a flow meter (5), a flow meter data display controller (6), a mobile Composed of trolley (7), valve (8) and pipeline, a blowdown valve (8) is fixed at the bottom of the buffer tank (3), and a valve (8) and pressure gauge (4) are fixed at the top of the buffer tank (3), It is characterized in that a buffer tank (3) and a flow meter (5) are fixed on the upper part of the mobile trolley (7), and a pipeline (1) is connected between the outlet of the buffer tank (3) and the inlet of the flow meter (5), The inlet of the buffer tank (3) is connected with a check valve (2) and a valve (8), the inlet pipeline (1) is connected to the inlet valve (8) of the buffer tank (3), and the outlet of the flow meter (5) is connected to There is a valve (8), the outlet valve (8) of the flowmeter (5) is connected with an outlet pipeline (9), and the flowmeter (5) is connected with a flowmeter data display controller (6). 2. The mobile oil well single well metering device according to claim 1, characterized in that: a bypass pipeline is connected between the inlet pipeline (1) and the outlet pipeline (9), and a valve ( 8). 3. The mobile oil well single well metering device according to claim 1, characterized in that: a quick connector is connected to the other end of the inlet pipeline (1); and a quick connector is connected to the other end of the outlet pipeline (9). 4. The mobile oil well single well metering device according to claim 1, characterized in that: there is an air compressor on the mobile trolley (7).

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