Measurement and Distribution Technology of Wet Steam Flow Meter

Abstract: Wet steam flowmeter metering and distribution technical information is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. On the premise that the quality of steam at the outlet of the steam generator is guaranteed, the flow rate of the steam injected into the steam injection well affects the output of the steam flooding well group to a great extent. Since the density of wet steam is a function of temperature, pressure and dryness, its variation is only related to these three parameters. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of wet steam flowmeter measurement and distribution technical articles. On the premise that the quality of steam at the outlet of the steam generator is guaranteed, the flow rate of the steam injected into the steam injection well affects the output of the steam flooding well group to a great extent. Since the density of wet steam is a function of temperature, pressure, and dryness, its change is only related to these three parameters. To accurately calculate its flow, it is necessary to compensate for these three parameters. According to the data collected on site, the steam flow rate is 0.89 t lower than the water flow rate per hour on average. For self-use steam atomization of the steam injection boiler, the dryness sampling water and cooling water consume about 0.33 t per hour, and the difference is actually 0.56 t. The rated pressure of the steam flowmeter is 17.2 MPa, the rated temperature is 350 °C, the flow range is 0-23 t/h, and the flow error is 4.3%. 1. Measurement plan The heavy oil steam flooding technology has been identified as one of the main oilfield development methods. On the premise that the quality of steam at the outlet of the steam generator is guaranteed, the flow rate of the steam injected into the steam injection well affects the production of the steam flooding well group to a large extent, which makes the measurement of the flow rate of the injected steam in a single well very important. The problem of two-phase flow measurement of steam and water. How to accurately measure the steam injection volume of a single steam injection well is the key to heavy oil steam flooding. According to the previous test results of the steam flowmeter, considering the installation location of the steam flowmeter in the field, the long distance of analog signal transmission, and inconvenient maintenance, it is determined that the steam flowmeter adopts high temperature and high pressure intelligent integrated capacitive vortex flowmeter and Wireless GPRS communication method. The flowmeter is powered by solar energy, and the instantaneous flow, cumulative flow, medium temperature and other signals are transmitted to the GPRS multiple receiving device (remote metering monitoring and management system) in the meter duty room through GPRS to realize the monitoring and management of many parameters of the on-site flow meter. 2. Compensation of temperature, pressure and dryness in measurement Since the density of wet steam is a function of temperature, pressure and dryness, its changes are only related to these three parameters. To accurately calculate its flow, these three parameters need to be compensated. The temperature and pressure in saturated steam have a one-to-one correspondence, so only one of the two parameters needs to be compensated. Here, the temperature that is relatively easy to measure is selected for compensation. As for the compensation of dryness, due to the high cost of dryness measurement, and the variation of dryness in this project is not too large (estimated to be between 60% and 80%), it is treated as a modifiable fixed value. , can be modified at any time in the instrument panel; the dryness meter signal or data can also be connected to the secondary meter for accurate point-by-point compensation, and the mathematical model of dryness and density has become an accurate formula in thermodynamics. The precision measurement of the V-shaped cone flowmeter with temperature, pressure and dryness compensation can meet the needs of production management. All kinds of throttling differential pressure flowmeters use the same form of mathematical equations, and the generally applicable formulas for calculating the actual flow under working conditions are shown in equations (1) and (2). Only in determining the size and the specific realization of the flow, there are some small differences in the various throttle flow meters. For the V-type inner cone throttle device, in the flow calculation formula of formula (1) or formula (2), the equivalent opening diameter and the equivalentβ value. For VNZ flowmeters, D2 -d2v should be used in place of d2 in the above two equations. For VNZ flowmeters an equivalent should be usedβ value(βv) Substitute into the above formulas (1) and (2) to replace the originalβ value. Equivalent in this caseβ value isβv , which can be obtained according to the following formula, where D is the inner diameter of the measuring tube under working conditions (m); dv is the diameter of the circle at the maximum cross-section of the sharp cone under working conditions (m);βv is the equivalent diameter ratio of the VNZ throttling device, dimensionless. dv can be calculated by the following formula, where dv and D both refer to the dimensions under working conditions. The equivalent opening diameter of the throttling part similar to the orifice plate (or nozzle) dˊ=βv·The design pressure in the D measuring tube can be up to 4 or 6 MPa. The operating temperature can reach 370 ℃ or higher (eg 640 ℃). The mixing of the fluid is better achieved downstream of the V-shaped inner cone and it is a good mixer. 3. Field application From the field test results of Liaohe Oilfield, the output frequency signal of the meter is relatively stable under different working conditions, which proves that the capacitive vortex flowmeter is suitable for the measurement of instantaneous flow and cumulative flow of wet steam. According to the data collected on site, the steam flow rate is 0.89 t lower than the water flow rate per hour on average. For self-use steam atomization of the steam injection boiler, the dryness sampling water and cooling water consume about 0.33 t per hour, and the difference is actually 0.56 t. The rated pressure of the steam flowmeter is 17.2 MPa, the rated temperature is 350 °C, the flow range is 0-23 t/h, and the flow error is 4.3%. The safety, accuracy, durability, anti-vibration, sealing and other properties of capacitive vortex flowmeter basically meet the technical requirements for on-site steam measurement of Jin 45 steam flooding. A total of 65 sets of industrial conversion steam flooding were installed in the first batch of Jin 45 blocks. According to the data collected on site, the positive and negative errors were 5% to 3%, which realized the artificial quantitative control of steam injection. There is no need to manually transcribe data on site, and remote monitoring is realized. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Wet steam flow meter measurement and distribution technology'

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