Because CO2 is a kind of gas with high solubility in oil and water , when it is largely dissolved in crude oil, it will expanse the crude oil volume and decrease its viscosity, and it will also reduce the interfacial tension between oil and water. After the discharged CO2 being gathered and purified and used in oilfield flooding, it can not only reduce CO2 emission, but also increase crude oil recovery rate. Economic benefit and social benefit are both remarkable. Compared with other oil flooding technology, CO2 flooding method is with big application scope, low flooding cost, and significant increasing of oil recovery rate. Now CO2 flooding method has been widely used. By real-time unattended monitoring the parameters of casing gas component, oil casing pressure, downhole temperature and pressure, working fluid level and pumping parameters, online monitoring system for CO2 flooding well completes diagnostic analysis of oil-well pump and sucker rod, system efficiency analysis and effect analysis CO2 flooding method, and further optimize and adjust the working condition of pumping system.
2. Main Configuration
. Measurement and control equipment for working fluid level
. Gas Chromatograph and procedure
. Indicator diagram, power, oil pressure, casing pressure sense and testing system
. Downhole pressure and temperature and testing system
. RTU control cabinet
. Testing cabin and ancillary facilities
3. System Functions
. Test function: Take stroke frequency as a cycle, real-time or timing complete: indicator diagram test (including stroke length, stroke frequency); three-phase voltage curve test of motor, motor current curve test, active power curve test, reactive power curve test, power factor test and balance index test; ground indicator diagram and three-phase electric energy synchronization test (active power, reactive power, power factor); wellhead oil pressure and casing pressure curve test; auto-test of working liquid level; casing gas component analysis; downhole pressure and temperature test.
. Control function: Control echo gun timing of working liquid level, automatic sounding and sound wave detection, control gas component analysis procedure.
. Calculation function: According to the standard of petroleum industry SY/T 5264-2006 “Energy Consumption Measurement and Calculation Method of Oilfield Production System”, it calculates polished rod power, effective power, theoretical displacement, pump efficiency, ground efficiency, downhole efficiency, system efficiency, load utilization rate, stroke utilization rate, power utilization rate, torque utilization rate, depth of working liquid level, balance index, etc.
. Diagnostic analysis function: indicator diagram analysis of pump, diagnosis of pump working condition, production calculation via indicator diagram, stress analysis and diagnosis of roofbolt, torque analysis of crankshaft, torque balance analysis, analysis of electric power curve.
. Statistical function: the statistics of each well working parameters, efficiency analysis and working condition.
. Browsing function: By means of IE browser, browsing is realized by permission.
4. Main Technical Parameters
|Test physical quantity||Measurement range||Precision|
|Motor power||< 75kW||2%|
|Depth of working liquid level||0m~2500m||1%|