Autonomous electrical heating facility supplied by wind turbine for elimination of oil wellbore paraffin deposits
The article considers an autonomous electrical heating facility supplied by a wind turbine designed to eliminate paraffin deposits in an oil wellbore. Computer modeling of the facility is performed. Modeling results are verified with a laboratory simulation bench. Operating curves for various operating conditions are obtained. An optimal resistance of the heating cable is determined to ensure a maximal efficiency of the wind turbine, as well as the amounts of energy produced by the wind turbine with a constant load resistance and resistance control are compared.
A novel heating system for heavy oil extraction
At present, industrial frequency heating technology is widely used to extract heavy oil which the content of glial asphalt, wax and freezing point are higher. Its heating effect is poor and it wastes electricity seriously. With the integrated application of eddy effect, skin effect and proximity effect, a novel heating system was developed. Both a dedicated multi-function cable and three-phase AC source whose voltage, frequency and power can be regulated were designed. The experimental results showed that the heating system has advantages such as high heating efficiency, low power consumption, and small pollution to the power grid, which can be used for practical production.
Extraction of high molecular weight hydrocarbons from source rocks: an example from the Green River Formation, Uinta Basin, Utah
Abstract Results of extraction experiments performed on immature Green River Formation source rock samples from the Black Shale Facies (Uinta Basin, Utah) demonstrate the potential of extracting high molecular weight hydrocarbons (HMWHC) with sequential dichloromethane:methanol/soxhlet and p -xylene/sonication techniques. The first soxhlet extraction step with DCM:MeOH removes lower molecular weight alkanes from the source rock while the HMWHC remain in the rock residue. Sonication of the rock residue with p -xylene recovers these HMWHC, showing distinct hydrocarbon distributions and preferences in high temperature gas chromatograms. Extracts obtained by using p -xylene/soxhlet with original source rocks and sequential soxhlet extraction instead of sonication have relatively lower concentrations of HMWHC. Sequential extraction of two other source rock types (Mahogany Shale and Black Shale Facies coal) did not result in detection of similar HMWHC in the extract. This indicates that the presence of these compounds in the Black Shale Facies of the Green River Formation is a primary source signal and a specific characteristic of this source rock.