Read the text and determine which statement corresponds to the content of the text. Petroleum is a valuable raw material. It is a mixture of hydrocarbons. Analyses of petroleum proved that it consists of carbon and hydrogen. Petroleum contains gaseous,

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Petroleum is a valuable raw material. It is a mixture of hydrocarbons. Analyses of petroleum proved that it consists of carbon and hydrogen.

Petroleum contains gaseous, liquid and solid hydrocarbons of different composition and properties. Thesе gaseous, solid and liquid hydrocarbons fall into three main classes: the paraffines, naphthenes and aromatic hydrocarbons.

The colour of petroleum varies considerably. Some oils may be almost colourless, others – light yellow, red, green, brown or black.

The odour of crude oil is also determined by its composition. The paraffines and naphthenes give agreeable odours whereas unsaturated hydrocarbons containing nitrogen compounds and sulphur cause the disagreeable odours.

The boiling point depends on the presence of hydrocarbons of low and high boiling points. The more volatile hydrocarbons are in the crude oil, the lower the boiling point.




Выберите один ответ:
a. The odour of petroleum is determined by oil quality
b. Turbo-drill is applied in rotary drilling whereby the drilling bit is rotated by a multi-stage turbine positioned just above the bit at the bottom of the string.
c. During the further drilling operations the mud fluid ascends along the clearance between the drill pipes and the casing
d. the odour of petroleum is determined by its composition.