The technical renovation of gas metering system

Beijing zhenwu oilfield gas concentration treatment station for gas production and transmission, at 20 ℃, 101. Under the 325 kpa daily processing capacity of 4 & times; 10 4 power of m3, gas after light hydrocarbon unit compression refrigeration, extraction of liquefied petroleum gas storage transport, quantitative filling become a commodity. After practicing the light component of dry gas ( C1、C2) Through the transmission pipe network to supply oil field production, living quarters and jiangdu local enterprises. Among them, the true cao to gas for after dealing with the light hydrocarbon unit of zhenwu and Cao Zhuang oilfield associated gas, more than C3 before processing component is greater than 5%; And 7 - 8 to gas for wing on oil field gas, gas well is not higher than 5%, more than C3 elements directly to the transmission network, the production process as shown in figure 1. A, gas metering current situation and existing problems of metering device adopt the CW - originally 430 double corrugated match the standard orifice differential pressure gauge, the implementation of station measuring gas production and export, found that there are two problems in use, is a the airflow ripple pipe, draw the curve of hard to read accurately, and measure the real value of the measurement error; 2 it is double corrugated differential gauge for mechanical measurement instrument, not only need to check on a regular basis, and the failure rate is higher, often appear pen needle is leaking, connecting rod break off and the clock had stopped, and so on and so forth, not only d, calibration workload big suppression, and the measurement error of natural gas is more than 15% ( See table 1) 。 Natural gas comprehensive error calculation method for: ( Real cao to gas + 7 - forever 8 intake - The product gas - The total transmission) / ( True cao inlet 10 7 - forever 8 inlet) x100% ( 1) The increase of gas metering error lead to the production department can't accurate records of oilfield production and development data, thus affecting the implementation of production measures and operating index evaluation and on-site production coordination, operation and task index decomposition and complete, and even lead to trade both sides to produce measurement issue, make the enterprise and user interests suffer loss. Natural gas metering error increases the reason mainly has the following four aspects. ( 1) 慢性消耗病, 430 double corrugated differential gauge cheap, no power, no explosion problem, through damping adjustment, suitable for the vibration amplitude and larger occasions; Instrument interchangeability, one-way overload protection device can ensure the meter measuring element from being damaged; Complex structure, the key components easy to damage, a single component failure would affect the accuracy of the measuring system; Daily maintenance workload is big, metrologists daily inspection on differential gauge maintenance, instrument man every 15 days should be differential gauge check again; Operate data computing workload is big, each instrument should respectively take pressure, differential pressure of 24 points are normalized, to achieve 24 h, the flow of gas at the same time for the card reading and human error, the accuracy of less than 2% of the standard requirement, often produce trade disputes; Standard orifice plate check replacement is not convenient, CWD430 differential gauge equipped with ordinary orifice valve, due to the installation, maintenance is not standard, cause the eccentric orifice plate installation, hole processing non-standard or easily blocked, caused the larger error of measurement. ( 2) On-site production facilities have over pressure protection function, when the production pressure more than 2. 5 mpa, the system need to vent pressure, but due to lack of measurement instrument, vent quantity can't accurate measurement, not only will cause energy waste and environmental pollution. ( 3) Associated gas before entering the metering device fails to effectively gas-liquid separation, make the medium flows through the throttle device is a single Newtonian fluid, leading to low differential pressure value. ( 4) Due to the limitation conditions, the type 1011 gas chromatograph analyzer equipment aging, high failure rate, make the gas component test and density calculation produces large error; Because of thermometer and dish type pressure transmitter, the standard orifice plate and other supporting gage calibration and maintenance, failure to implement cycle to reduce system accuracy. Second, the improvement measures and effects ( 1) Change the CWD - 430 double corrugated differential gauge, adopt advanced SWP programmable automatic compensation flow integrating instrument, replaced the ordinary standard orifice throttling device for fast loading senior orifice valve, 3051 equipped with reliable performance and Pt100 temperature transmitter, pressure transmitter has realized the automatic pressure, differential pressure, temperature signal acquisition, the device as shown in figure 2. SWP to collect traffic ( Differential pressure) , pressure, temperature, Temperature, pressure compensation) Such as signal data for 1 / s, according to the input flow coefficient and gas density is calculated, to calculate the instantaneous gas flow, the system calculation, display instantaneous flow and cumulative flow. SWP integrating intelligent flow control device is connected to a printer, timing print SWP under standard state in natural gas production, high accuracy, the data can be transmitted, print, can check constantly lose situation change of orifice plate. SWP is based on single chip microprocessor, through the input signals circuit of temperature resistance, pressure flow of 4 ~ 20 ma current signal by A/D converter is converted into digital signal, the microprocessor set according to the result of sampling and digital content, after calculation comparison will flow, pressure, temperature signal display and output.

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