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 ________.