Study Of Influencing Factors And Treatment Measureson Scale Forming In Oilfieldpipeline

At present, because of daqing oil field has entered the high water-cut stage, along with the rising oil recovery liquid water, the surface gathering system of water flooding and asp flooding found serious scaling phenomenon. Oil pipeline scaling not only arouse reducing in producing efficiency, also caused of the waste of funds in maintenance work, and become the oilfield production safety hidden trouble.In daqing Sa'nan oilfield as the research object, discusses the causes and oil scaling factors, using X-ray diffraction and thermogravimetric analyzer and SEM to analyze the scaling samples. Test results show that the main ingredients of scaling is CaCO3 in water flooding, and in asp flooding are carbonate and silicate. According to the scale of main component, by changing the experimental condition, for CaCO3 and Si4+ scaling, studied the affecting factors of scale formation, research results show that the temperature effect is an important factor for CaCO3 scaling, NaCl, KCl and Mg2+ have certain increase dissolve for CaCO3; In single silicon ions system, With decrease of pH and temperature, silicon ions scaling, The single operation of PAM and surfactant is not obvious to scaling effect; The composite effects of PAM, surfactants, calcium, magnesium and silicon ions make the composite system scaling more easily.Using methods of saturation index to predict the scaling trend of daqing Sa'nan oilfield, the results show that the water flooding oilfield and asp flooding have serious scaling trend, must promptly take preventive measures. This thesis take " heating dense state ", "scaling ions change", "antiscale rate" as the evaluation indexes, evaluating the British net yuan scale removal, South Korea World Magnetic and German World Scale-buster which are advanced foreign physical anti-sacle instruments online, Search for the suited anti-scaling instruments for oilfield. the result shows that the British net yuan scale removal and Germany Scale-buster anti-scaling apparatus on the water flooding anti-scaling effect is good, the inhibition rate reached 88.7% and 89.6%; Instead of asp flooding, the antiscale effect of the net yuan electronic instrument is good, antiscale rate reached 69.25%.