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original site of the well (build).
6 The first successful well _____in 1866 (drill).
7 It ______a great success and prompted the drilling of many more
wells (consider).
8 He _____that oil and gas lay below Spindletop about 1,000 feet
(300 metres) deep (convince).
9 The Lucas well _____to have flowed about 2 million gallons (8,000
cubic metres) of oil per day (estimate).

15 Rewrite the following sentences in the passive.
1 A drilling rig drills hole in the ground.
2 Masts and derricks support the great weight of the drilling tools.
3 The rig crew raises long lengths of pipes during the drilling
process.
4 Whether working on a rig or merely visiting it, everyone must
wear personal protective equipment, or PPE for short.
5 Rig workers also wear gloves to protect their hands.
6 Drake and Smith had drilled the hole to a depth of about 69 feet.
7 Drake and Smith then built a drilling rig.
8 At Spindletop, the Hamil’s used water as a drilling fluid.
9 The wall cake stabilized the sand and kept it from caving in.
10 Cable-tool rigs drilled a lot of wells before being supplanted by
rotaries.
11 Colonel Drake and Uncle Billy used a steam-powered cable-tool
rig to drill the Oil Creek site.

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