rig operator ( workover driller )

rig operator ( driller-workover )

1. EQUIPMENT FAILURE : the most common type of production problem. For example, a rod may break in a pumping well, requiring special equipment called a service rig to be moved to the well to recover the rod from the hole and put the well back into production , subsurface pump failure and tubing develops a leak or a break from corrosion, or mechanical stresses . If the well needs a quick jolt of clean fluid to get it working again we pull the pump up , A load of clean oil is pumped down using a pressure pump and tank , The pump is then reseated and the well placed on pump.
2. WELLBORE PROBLEMS : Sanding, formation damage, paraffin accumulation, oil-water emulsions, and corrosion .
3. a well begins to produce an excessive amount of salt water: first necessary to "kill" the well with some fluid, such as drilling mud, salt water, oil …… , If the salt water is coming from the lower part of the reservoir, it is usual to squeeze-cement the perforation with either a low-pressure or a high-pressure squeeze. If the high-pressure squeeze-cementing technique is used, a special packer is run on the bottom of the tubing to protect the casing and other equipment at the wellhead . If the low-pressure or "bradenhead" squeeze-cementing method is used, then a packer is not required . After the cement has set , it may be necessary to drill out the cement from inside the casing and reperforate the casing at the desired intervals, since the cement will have sealed off all the old perforations.
4. Broken casing maintenance , Fishing several kinds of instruments , milling tools , Stimulation , Acidizing , Change the pay zone , perforating ,……….

Diploma in Intermediate Institute for Petroleum &
Mineral Resources Syria - Rumeilan 1995

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