CN202339229U - A device for measuring the weight of produced fluid on-line at low temperature and under pressure for pumping wells - Google Patents

Abstract

The device for weighing the weight of the produced liquid of the pumping well on line under pressure at low temperature is applied to the measurement of the produced liquid of an oil extraction single well of an oil field. A gas-liquid separator is fixed at the upper part of the oil measuring tank, a first electric valve is connected on a liquid inlet pipeline of the gas-liquid separator, and a liquid discharge pipe at the lower part of the gas-liquid separator is connected with a liquid inlet of the oil measuring tank; an exhaust port at the upper part of the gas-liquid separator is connected with an exhaust pipeline; a liquid discharge pipeline at the lower part of the oil measuring tank is connected with a gear pump, a water content analyzer and a second electric valve; two ends of the nitrogen pipeline are connected with a high-pressure nitrogen balancing tank; there are three load sensor and hydraulic pressure lift platform in the bottom of oil gauging tank, first motorised valve, second motorised valve, third motorised valve, relief valve, load sensor, gear pump and moisture analyzer pass through signal line connection signal acquisition module, and signal acquisition module passes through the wire and connects the control cabinet. The effect is as follows: the liquid production is measured on line under pressure in the whole process, the accuracy of single-well measurement is improved, and the vehicle-mounted movement is flexible.

Description

A device for measuring the weight of produced fluid on-line at low temperature and under pressure for pumping wells

technical field

The utility model relates to the technical field of oil production in oil fields, in particular to a special device for measuring production fluid, which is a device for weighing production fluid on-line at low temperature and under pressure in a pumping well.

Background technique

With the deepening of rolling development of oilfields, many low-yield oilfields and pumping wells adopt tandem oil-gathering process. Due to the characteristics of oil-gathering technology of tandem pumping wells, the production of a single well cannot be measured normally. Wheels, turbines, and elastic scraper flowmeters are not suitable for measuring heavy oil, while ultrasonic flowmeters and traditional two-phase separators have large measurement errors in practical applications, so the method of shutting down the wells to find the difference can only be used For metering, frequent start and stop will affect oil well production and single well production conditions.

At present, the liquid measurement technology of the power map method popularized and applied in the oil production field is affected by special working conditions such as gas influence, tubing leakage, partial wear of the rod and pipe, and thick oil, resulting in large errors in the liquid production measurement of some ultra-low liquid production wells. A more accurate measurement method is needed on site to compare and verify the measurement results of the power diagram method.

Utility model content

The purpose of the utility model is to provide a device for weighing the weight of the produced fluid on-line at low temperature and under pressure in the pumping well, so as to realize the on-line measurement of the produced fluid under pressure in the pump well, and meet the urgent need for single-well measurement of serial wells in oil field production . It meets the single well measurement of pumping wells in remote and cold areas, and is also used as a comparison standard for the calculation of fluid production measurement results by the work diagram method.

The technical scheme adopted in the utility model is: a device for weighing the weight of the produced fluid on-line with pressure at low temperature in the pumping well, mainly composed of a microwave heater, an oil measuring tank, an electric valve, a gas-liquid separator, a safety valve, a load sensor, and a gear pump. , water content analyzer, gas flow meter, signal acquisition module, console, high-pressure nitrogen balance tank and hydraulic lifting platform, the oil measuring tank is a horizontal cylindrical tank, and a safety valve is connected to the top of the oil measuring tank, which is characterized in that : A gas-liquid separator is fixed on the upper part of the oil measuring tank, the first electric valve is connected on the liquid inlet line of the gas-liquid separator, and the liquid discharge pipe at the lower part of the gas-liquid separator is connected with the liquid inlet of the oil measuring tank; The exhaust port on the upper part of the liquid separator is connected with an exhaust pipeline, and the gas flow meter and the third electric valve are connected to the exhaust pipeline; there is a drain pipeline at the lower part of the oil measuring tank, and a gear pump, water-containing pipeline is connected to the drain pipeline. The analyzer and the second electric valve; the exhaust line of the gas-liquid separator is connected with the drain line of the oil measuring tank; a nitrogen pipeline is connected to the upper part of the oil measuring tank, and the other end of the nitrogen pipeline is connected to a high-pressure nitrogen balance tank. In the process of oil well liquid production metering, the air pressure in the metering liquid tank is supplemented by the nitrogen balance tank to realize the constant pressure metering state of simulating wellhead back pressure. There are three load sensors at the bottom of the oil measuring tank. The bottom of the sensor is fixed on the column of the manual hydraulic lifting platform. The first electric valve, the second electric valve, the third electric valve, the safety valve, the load sensor, the gear pump and the water analysis The instrument is connected to the signal acquisition module (PLC) through the signal line, and the signal acquisition module (PLC) is connected to the console through the wire.

In order to adapt to the metering of low-temperature oil well production fluid in winter, a microwave heater is fixed at one end of the oil measuring tank.

A brief description of the operation process of the device for measuring the weight of produced fluid on-line at low temperature and under pressure in pumping wells is helpful for understanding the utility model. See Figure 1. The entire weight of a dipstick tank body 2 is carried on the three load sensors 6 by a manual hydraulic lifting platform 15 . When metering, connect the wellhead with a high-pressure hose through a quick connector. The wellhead output fluid of the oil well first enters the gas-liquid separator 4, and the separated liquid flows into the measuring oil tank 2 through the inclined plate; the separated gas enters the exhaust pipeline, and the signal acquisition module 12 (PLC) records the indication value of the load sensor 6 Change, calculate the total liquid production at the wellhead according to the metering time length and load increment. Weighing measurement avoids the influence of gas on the volume of the produced liquid. When the produced liquid reaches the set weight, the gear pump 7 is turned on through the console 13. Quickly discharge the liquid in the measuring oil tank 2 until the total weight of the monomer tank is reduced to the set weight, stop the liquid discharge and continue the second measurement, repeating this to achieve continuous measurement. After measuring a well, discharge all the liquid in the oil tank. During the metering process, when the gas pressure in the measuring oil tank is lower than the system back pressure, the device’s own high-pressure nitrogen tank 14 will automatically fill the vector oil tank to maintain the balance between the pressure in the measuring oil tank and the pressure of the production back pressure pipeline, and realize oil pumping. Measuring liquid under pressure on-line. During metering construction in winter, connect the oil measuring tank 2 and the oil production wellhead through a high-pressure hose, and turn on the microwave heater 1 to preheat the entire metering system. After the preheating is completed, keep the set constant temperature in the working state, which can achieve a low temperature of -35°C Normal metering under conditions. The safety valve 6 is mainly used to control the upper limit of the system pressure.

Operation steps: refer to Figure 1.

1. When the weighing and measuring device is in use, the car body should be placed upwind and parallel to the pumping unit to keep it stable, and no large inclination is allowed. The inlet and outlet of the oil measuring tank 2 should be kept at the shortest distance from the inlet and outlet of the oil well.

2. The liquid inlet of the oil measuring tank 2 should be connected with the liquid outlet of the oil well with a high-pressure hose, and the liquid outlet of the oil measuring tank 2 should be connected with the oil well back pressure pipeline with a high-pressure hose (or ring valve connection), and Ensure that there is no leakage at each connection end, and check whether each manual control valve is in a flexible opening and closing state.

3. The power supply of the system can be connected through a single well transformer. After repeatedly checking that the connection is correct, turn on the power switch of the main engine, and the power indicator light of the control cabinet will be on.

4. After the liquid discharge pipeline is heated to the predetermined temperature, check the forward and reverse rotation of the motor (see the electric control part for the method) to ensure that the motor of the gear pump 7 is rotating forward, and the liquid discharge of the gear pump 7 is working normally, and the preparation is ready.

5. Open the liquid outlet valve of the oil well, turn on the pumping unit, measure the liquid into the oil tank, record the time, and enter the metering state; at the same time, open the regulating valve of the high-pressure nitrogen balance tank 14, adjust the pressure of the oil measuring tank 2 to the system back pressure, and close The high-pressure nitrogen balance tank 14 keeps the pressure balance of the metering state.

6. During the measurement process: record the time, read the results and record them. When the liquid in the volumetric oil tank 2 reaches the set load upper limit, the liquid discharge motor will automatically start and start to discharge liquid; the load in the volumetric oil tank 2 will drop to the lower limit. , the control system sends out a signal, and the gear pump 7 stops draining; a metering process is completed, and so on until the metering ends.

7. Close the production fluid valve after the measurement is completed, cut off the power supply after the measurement oil tank 2 is emptied, drop the hydraulic lifting platform 15, unload the load sensor 6, and control the pressure release through the electric valve at the joint of the wellhead inlet and outlet fluid connection. After venting, remove the wellhead high-pressure hose, disconnect the power supply, clean up the well site, and resume normal production of the oil well.

Beneficial effects of the utility model: The utility model is a device for weighing the weight of the produced fluid on-line at low temperature and under pressure in the pumping well, and can measure the production fluid on-line under pressure in the whole process, which improves the accuracy of single well measurement, and realizes multi-well measurement by vehicle-mounted movement . Microwave overall heating oil tanks and pipelines are used to realize low-temperature metering in winter. Compared with waist wheel, turbine, and elastic scraper flow metering oil, the metering is not affected by the wax content, high viscosity and low condensation of the product liquid; it is different from the commonly used ultrasonic flow rate Compared with the meter and the traditional two-phase separator meter, the metering error is small. Compared with the traditional metering method, the mobile metering device with pressure can simplify the process technology, save a lot of ground construction costs, and facilitate timely understanding of the operating conditions of the pumping well.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the utility model low-temperature online pressure weighing device for producing fluid in pumping wells.

In the figure, 1-microwave heater, 2-oil gauge tank, 3-first electric valve, 4-gas-liquid separator, 5-safety valve, 6-load sensor, 7-gear pump, 8-moisture analyzer, 9-Second electric valve, 10-Third electric valve, 11-Gas flow meter, 12-Signal acquisition module, 13-Console, 14-High pressure nitrogen balance tank, 15-Hydraulic lifting platform.

Detailed ways

Embodiment 1: Taking a low-temperature online pressure-bearing device for weighing produced fluid in a pumping well as an example, the utility model is further described in detail.

See Figure 1. The utility model is a device for weighing the weight of the produced liquid on-line at low temperature and under pressure in the pumping well, mainly composed of a microwave heater 1, an oil measuring tank 2, three electric valves, a gas-liquid separator 4, a safety valve 5, and three load sensors 6 , a gear pump 7, a moisture analyzer 8, a gas flow meter 11, a signal acquisition module 12, a console 13, a high-pressure nitrogen balance tank 14 and a hydraulic lifting platform 15.

The oil measuring tank 2 adopts a horizontal cylindrical tank with an inner volume of 1 m ³ , and a safety valve 5 is connected to the top of the oil measuring tank 2 . A gas-liquid separator 4 is installed between the top of the oil measuring tank 2 and the liquid inlet line, the first electric valve 3 is installed on the liquid inlet line, and the drain pipe at the bottom of the gas-liquid separator 4 is connected to the inlet of the oil measuring tank 2. The liquid port is connected; the exhaust port on the top of the gas-liquid separator 4 is connected with an exhaust pipeline, and the gas flow meter 11 and the third electric valve 10 are connected on the exhaust pipeline; A gear pump 7, a moisture analyzer 8 and a second electric valve 9 are connected to the drain line at the lower part of the oil measuring tank 2; the exhaust line of the gas-liquid separator 4 is connected to the drain line at the lower part of the oil measuring tank 2; The top of the oil measuring tank 2 is connected with a nitrogen pipeline in addition, and the other end of the nitrogen pipeline is connected with a high-pressure nitrogen balance tank 14; at the bottom of the oil measuring tank 2, there are three high-precision load cells 6 with a range of 700kN. The bottom is fixed with manual hydraulic lifting platform 15. Three 700kN high-precision load sensors 6 are installed on three columns of the manual hydraulic lifting platform 15 . The first electric valve 3, the second electric valve 9, the third electric valve 10, safety valve 5, load cell 6, gear pump 7 and moisture analyzer 8 are connected to signal acquisition module 12 (Siemens PLC) by signal line, signal acquisition The module 12 (PLC) is connected to the console 13 through wires. The system realizes human-computer interaction through a Siemens touch screen.

One end of the oil measuring tank 2 is fixed with a microwave heater 1 .

The device for measuring the weight of produced fluid on-line with pressure at low temperature for pumping wells is suitable for conventional pumping wells in oil field production. The measurement range of liquid production: 0-150m ³ /d; gas production: 0-3000m ³ /d; working pressure : 0.11～2.5MPa; Ambient temperature: -45℃～80℃. Oil production viscosity: ≤3000mPa·s, water content: 0-100%.

Claims (2)

1. A device for weighing the weight of produced fluid on-line with pressure at low temperature in a pumping well, mainly composed of a microwave heater (1), an oil measuring tank (2), an electric valve, a gas-liquid separator (4), and a safety valve (5 ), load sensor (6), gear pump (7), moisture analyzer (8), gas flow meter (11), signal acquisition module (12), console (13), high-pressure nitrogen balance tank (14) and hydraulic Composed of a lifting platform (15), the oil measuring tank (2) adopts a horizontal cylindrical tank, and a safety valve (5) is connected to the top of the oil measuring tank (2), which is characterized in that: the upper part of the oil measuring tank (2) The gas-liquid separator (4) is fixed, the first electric valve (3) is connected to the liquid inlet pipeline of the gas-liquid separator (4), and the liquid discharge pipe at the lower part of the gas-liquid separator (4) is connected with the oil measuring tank (2 ) is connected to the liquid inlet; the gas-liquid separator (4) top exhaust port is connected with an exhaust pipeline, and the gas flow meter (11) and the third electric valve (10) are connected on the exhaust pipeline; The lower part of (2) has a drain line, and a gear pump (7), a moisture analyzer (8) and a second electric valve (9) are connected to the drain line at the lower part of the oil measuring tank (2); the gas-liquid separator The exhaust line of (4) is connected together with the drain line of the oil measuring tank (2); the top of the oil measuring tank (2) is connected with a nitrogen pipeline, and the other end of the nitrogen pipeline is connected with a high-pressure nitrogen balance tank (14); There are three load sensors (6) at the bottom of the oil measuring tank (2), and a manual hydraulic lifting platform (15) is fixed at the bottom of the oil measuring tank (2), the first electric valve (3), the second electric valve ( 9), the third electric valve (10), safety valve (5), load sensor (6), gear pump (7) and moisture analyzer (8) are connected to signal acquisition module (12) by signal line, signal acquisition module ( 12) Connect the console (13) through wires. 2. The device for weighing the weight of the produced fluid on-line at low temperature in the pumping well according to claim 1, characterized in that: a microwave heater (1) is fixed at one end of the oil measuring tank (2) so that the metering system maintains a constant temperature status work. the

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