Under the premise that the steam quality at the exit of the steam generator is ensured, the flow rate of steam injected into the steam injection well largely influences the output of the steam drive well group. Since the density of wet steam is a function of temperature, pressure, and dryness, its change is only related to these 3
With regard to the parameters, it is necessary to compensate these three parameters in order to accurately calculate the flow rate. According to the data recorded on site, the average steam flow rate is 0.89 t per hour lower than the water flow rate. Steam injection boiler steam atomization, dry sampling water and cooling water consumption of about 0.33 t per hour, the difference is actually 0.56 t. The steam flow meter has a rated pressure of 17.2 MPa, a rated temperature of 350 °C, a flow rate of 0 to 23 t/h, and a flow error of 4.3%.
1. Metering scheme Heavy oil steam flooding technology has been identified as one of the major oilfield development methods. Under the premise of ensuring the steam quality at the exit of the steam generator, the flow rate of steam injected into the steam injection well affects the output of the steam drive well group to a large extent. This makes it very important to measure the injected steam flow rate of a single well. The measurement of two-phase flow in steam and water. How to accurately measure the steam injection volume of a single injection well is the key to heavy oil steam flooding.
According to the previous results of the steam flow meter test, taking into account the location of the steam flow meter installed in the field, the analog signal transmission distance, maintenance inconvenience and many other factors, to determine the use of high-temperature high-pressure steam flow meter intelligent capacitive vortex flowmeter and Wireless GPRS communication. The flowmeter is powered by solar energy, and the instantaneous flow, cumulative flow, and medium temperature signals are transmitted to the GPRS multi-channel receivers (Remote Metering Monitoring and Management System) between the instruments on duty via GPRS, which enables the monitoring and management of many parameters of the on-site flow meters.
2. Compensation of temperature, pressure, and dryness in measurement Since the density of wet steam is a function of temperature, pressure, and dryness, the change is only related to these three parameters. To accurately calculate its flow, these three parameters need to be compensated. In the saturated steam, the temperature and pressure have a one-to-one correspondence, so only one of the two parameters needs to be compensated. Here, the relatively easy temperature measurement is selected to compensate. As for dryness compensation, because the cost of dryness measurement is high and the range of dryness change in this project is not too large (estimated between 60% and 80%), it is treated as a modifiable fixed value. , can be modified at any time in the instrument panel; can also be dry meter signal or data into the second table for accurate compensation point by point, and the mathematical model of dryness and density has become an accurate formula in thermodynamics, using Accuracy measurement of V-cone flowmeter compensated by temperature, pressure and dryness can meet the needs of production management. All kinds of throttling differential pressure flowmeters use the same form of mathematical equations. The formulas for the actual flow under the commonly used calculation conditions are shown in equations (1) and (2). There are only slight differences among various flow meter types in terms of determining dimensions and achieving flow. For the V-type internal cone type throttling device, the equivalent opening diameter and the equivalent β value should be used in the formula for the flow rate in equation (1) or (2).

For VNZ flowmeters, d2 -d2v should be used to replace d2 in the above two equations.
For the VNZ flowmeter, an equivalent β value (βv) should be substituted into the above equations (1) and (2) instead of the original β value. The equivalent β value in this condition, βv, can be calculated as follows

Where D is the inner diameter (m) of the measuring tube under operating conditions; dv is the diameter of the circle at the maximum cross-section of the pyramid (m); βv is the ratio of the equivalent diameter of the VNZ throttling device, dimensionless.
Can be calculated by the following dv

In the formula, dv and D refer to the dimensions under working conditions. Throttle equivalent hole diameter similar to orifice plate (or nozzle)
Dˊ=βv·D
The design pressure in the measuring tube can reach 4 or 6 MPa. The operating temperature can reach 370 °C or more (such as 640 °C). Downstream of the V-shaped cone, fluid mixing is better achieved and it is a good mixer.
3. Field application The field test results from Liaohe Oilfield show that the meter's output frequency signal is stable under different working conditions, which proves that the capacitive vortex flowmeter is suitable for measuring the instantaneous flow and cumulative flow of wet steam.
According to the data recorded on site, the average steam flow rate is 0.89 t per hour lower than the water flow rate. Steam injection boiler steam atomization, dry sampling water and cooling water consumption of about 0.33 t per hour, the difference is actually 0.56 t. The steam flow meter has a rated pressure of 17.2 MPa, a rated temperature of 350 °C, a flow rate of 0 to 23 t/h, and a flow error of 4.3%. The safety, accuracy, durability, vibration resistance, and sealing performance of the capacitor vortex flowmeter currently basically meet the technical requirements for on-site steam metering of the Jin 45 block steam drive. The first batch of industrialized steam-driven flooding of Jin 45 Blocks installed a total of 65 units. According to the data taken from the site, the positive and negative errors ranged from 5% to 3%, achieving an artificial quantitative control of steam injection. No manual data transcription on site enables remote monitoring.

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