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Gold/Mining/Energy : Strictly: Drilling and oil-field services -- Ignore unavailable to you. Want to Upgrade?

To: marc chatman who wrote (20968)	5/1/1998 10:44:00 AM
From: Douglas V. Fant	Read Replies (1) \| Respond to of 95453

marc, Workover rigs unlike drilling rigs only do downhole work in wells already drilled. Oil often contains paraffin, which is dissolved as the oil is underground hot and under pressure from the rock formations. As the oil moves up the well bore it expands as pressure drops and the oil rises. This of course causes the oil to cool, and often the paraffin condenses out on the sides of the tubing in the well. Also the area downhole where you open an oil or gas well to flow production can fill up with sand and needs to be cleaned. Other times sides of well bores collapse or rock formations shift and bend the casing or inner tubing of the well. Some wells have corrosive tendencies (i.e. prduce some CO2- CO2 + water = carbolic acid) and you need to stop production on a regular cycle and shoot some anti-corrsivie coaitng downhole in order to protect the tubing from corroding and failing. In all of these case you call in a workover rig to address these downhole problems. A workover rig is much smaller than a drilling rig, and often is a package pulled around by a regular semi truck. Regardless of whether new wells are drilled, current oil and gas wells need to be serviced regularly in order to maintain or to stimulate and increase production rates. This is what well servicing rigs and companies do.... Sincerely, Doug F.