Hayhurst Drilling Company has been serving the Big Country since 1971. We are licensed to drill 800 feet to 3500 feet. We serve an area within 125 miles of Abilene, Texas.
An oil well is a term for any perforation through the Earth's surface designed to find and release both petroleum oil and gas hydrocarbons.
To drill a well - the well is created by drilling a hole 5 to 36 inches diameter into the earth with a drilling rig which rotates a drill string with a bit attached. After the hole is drilled, sections of steel tubing known as casing are used. The casing provides structural integrity to the newly drilled wellbore in addition to isolating potentially dangerous high-pressure zones from each other and from the surface.
After drilling and casing the well, it must be 'completed'. Completion is the process in which the well is enabled to produce oil or gas.
In a cased-hole completion, small holes called perforations are made in the portion of the casing which passed through the production zone, to provide a path for the oil to flow from the surrounding rock into the production tubing. In open-hole completion, often 'sand screens' or a 'gravel pack' is installed in the last drilled, uncased reservoir section. These maintain structural integrity of the wellbore in the absence of casing, while still allowing flow from the reservoir into the wellbore. Screens also control the migration of formation sands into production tubulars and surface equipment, which can cause washouts and other problems, particularly from unconsolidated sand formations in offshore fields.