The main physicochemical characteristics of the properties of oil flows before and after hydraulic fracturing was determined. It is established that oil after hydraulic fracturing of the formation is highly paraffinic and has a high pour point. At transport the mixture of oils under consideration there are difficulties associated with the deposition of asphaltene-resins-paraffin deposits (ARPD) on oilfield equipment and, as a result, an increase in energy consumption during the pumping of this oil. The purpose of the work is to find an effective method to prevent the deposition of ARPD in the oil stream. The most modern and effective method of inhibition of APRD precipitation in the pumped oil flow is currently the use of depressants, the addition of which to the stream in minimal volumes allows to decrease the pour point of the pumped oil to the required values.
To selection of depressant additives (DA), a complex of studies was carried out to investigate the physicochemical composition of crude oils, the freezing point depression of a crude oil at dosages of DA from 300 to 1500 g/t, and the influence of effective doses of DA on the onset temperature of crystallization of paraffin and rheological characteristics of crude oil. Also, a hydraulic calculation of the pressure head pipeline of oil treatment unit using the obtained rheological parameters of crude oil was carried out for pressure reduction estimation by the method of pressure gradient distribution assessment in the pipeline profile, and economic efficiency of DA application was considered.
References
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