2. Заполните пропуски приведенными словами и словосочетаниями: annulus, bit, bit string, boreholes, , cuttings, down, drilling rig, floorman, fluid, hole, , mud, mud man, mud tanks, oilmen, rotary, surface, water.

1. Oil is contained surface under the ground and in rocks under the sea. 2. To find it have to drill . 3. The equipment for drilling these holes is the . 4. Most rigs work on the system. 5. A bit rotates, it crushes and cuts the rock at the bottom of the . 6. The are carried to the surface by a special . 7. The fluid is called «mud». Mud is a mixture of clay, chemicals and _ water. 8. is not only used for carrying the cuttings up to the . 9. It is also used for keeping the cool. 10. The mud is pumped through the . 11. It comes back up again, through the . 12. The mud engineer or is in charge of the mud. 13. For example, he tells the how to mix the mud at the .