دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the pipe and special fittings used on floating offshore drilling rigs to establish a seal between the top of the wellbore, which is on the ocean floor, and the drilling equipment, located above the surface of the water. A riser pipe serves as a guide for the drill stem from the drilling vessel to the wellhead and as a conductor of drilling fluid from the well to the vessel. The riser consists of several sections of pipe and includes special devices to compensate for any movement of the drilling rig caused by waves. Also called marine riser pipe.

a description of a large volume water frac (ungelled water) where proppant sand is pumped at ¼ to ½ lb/gal. Normally at very high rates (25 to 50+ bpm). For very low permeability, non water sensitive formations.

ranges from 125 to 200 lb/ft3

n: a length of pipe whose bottom edge is serrated or dressed with a hard cutting material and that is run into the wellbore around the outside of stuck casing, pipe, or tubing to mill away the obstruction. Also called a bum shoe. See washover pipe.

n: the cutting shoe fitted to the lower end of washover pipe and dressed with hard-surfaced teeth or tungsten carbide.

uncontrolled run-in of coiled tubing into a wellbore.

wellbore radius.

94 lb of dry cement.

any non-fresh water flow. Saturated NaCl brine has a density of 9.9 lb/gal.

n: an influx of formation salt water into the wellbore.

n: a tool with a sharp pointed end designed to slice into sand and a hollow cylinder to trap sand samples. The sample bailer is slammed into the bottom of the wellbore with enough impact to force sand into it.