V. Study the definitions

Reservoir – place (often an artificial lake) where water is stored.

Decline – gradual and continued loss of strength.

Recovery – quickly regain one’s position.

Segregation – putting apart from the rest.

Steam – gas or vapour which rises from the boiling water.

VI. Ask and answer

1. – When …?

– When a large part of the crude oil cannot be recovered simply by ….

2. – What does the injected fluid …?

– It replaces the produced oil and maintains ….

3. – What happens to the gas …?

– It collects to form ….

4. – When is … realized?

– When gravity segregation of ….

5. – What is another …?

– … water flooding.

6. – When is … made more viscous?

– By the addition of ….

VII. Speak about the secondary recovery of oil.

UNIT 5

PETROLEUM REFINING

I. Read and learn the words

motor oil – моторное топливо

rock oil – скальная (неочищенная) нефть

still – перегонный аппарат

lubricating oil – смазочное масло

fuel oil – горючее

caustic soda – едкий натрий

sulfuric acid – серная кислота

treat (with) – обрабатывать, подвергать действию

surplus – излишний

straight distillation – недеструктивная (прямая) перегонка

upgrading – усовершенствование

odour – запах

cracking process – деструктивная перегонка

II. Read and translate the text