Daqing Crude Oil Adding Agent Transportation Experiment Research

To save the consuming energy and transport safely of the easy solidification and highviscidity crude oil has been the major technical challenge which our oil storage andtransportation sector faces. After more than 40 years of unremitting efforts, China in this fieldhas achieved many important results, but at present there are many hard technical problems mustbe solved to save the consuming energy and to transport safely of Daqing oil which contains toomuch wax. Because Daqing crude oil has much gum elements that can holdback the current flowimprover function, to improve the flowability of Daqing oil by adding the current flow improveris extremely difficult. In order to reduce the consumption at the oil transportation process andreduce the infrastructure investment of the second or third time newly built infilling wells andreduce the cost of oil withdrawal, we develop Daqing oil fields normal atmosphere temperatureand low-temperature oil transportation research and applied research by adding some chemicalagent.At present, Daqing oil field construction and design academy produced three differentnormal atmosphere temperature and low-temperature oil transportation chemical agents availablefor Daqing oilfield blocks, named DODE series crude oil flow improver. Daqing oilfield usedthis kind of crude oil flow improver to transport oil in low-temperature, the oil transportationtemperature has been cut down significantly, and economical benefits are distinct.The flowing of the pseudo emulsion that is made up of oil-water mixture and DODE seriesflow improver in the pipeline is a new phenomenon of oil development and transportationprocess .Compared with conventional oil-water mixture flows, after adding the agent not onlythe cold start pressure can be significantly reduced, but also the on-way resistance to flow alongthe pipeline could be reduced greatly. But this flow phenomenon mechanisms and quantitativerelationship have not yet been resolved, so we evolve this topic to study mainly about the coldstart pressure rule in the pipeline after the oil-water pseudo emulsion quiescence andstratification and the on-way resistance rule to flow along the pipeline, thus we could provide atheoretical basis for adding flow improver to achieve the normal atmosphere temperature andlow-temperature oil storage and transportation. We mainly study flow improver mechanisms, thecold start-up pressure gradient influence factors and the on-way resistance pressure drop andviscidity influence factors, the affection extent of different factors, finally we verify the pseudoemulsion fluid type, create pressure drop and viscosity formulas and calculate the experimentaldata, in-depth discuss the rheological characterization of oil-water mixture after adding this kindof flow improver.