دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. a partial restriction, generally a plate, placed to change the direction, guide the flow, or promote mixing within a tank or vessel. 2. a device that is seated on the bit pin, in a tool joint, or in a drill pipe float, to centralize the lower end of a go-devil while permitting the bypass of drilling fluid.

n: A replaceable metal ring inserted in the BHA (q.v.) to act as a landing collar for a survey tool.

bottom hole assembly.

the equipment or tools at the bottom of the tubing or drill string. The BHA is changed to achieve a certain result.

unscrewing a joint of pipe of part of a BHA.

n: A BHA specially designed to increase drift angle.

the connection of the braided cable to the rope socket or attachment to the tool string in a wireline conveyed BHA.

a mechanical device used to join strings of CT or attach a BHA to the CT.

a type of connector that utilizes a collett-type device for attaching a BHA to coiled tubing.

an explosive charge in a tool designed to sever very heavy BHA tools such as drill string collars and stabilizers. It latterly uses a focused explosive to blown the string apart. A tool of last resort.

n: a tubular device, usually from 10 to 60 feet (3 to 18 metres) long, run at the bottom of the drill pipe in place of a bit and used to cut a core sample.

n: A special tool installed at the bottom of the drill string to cut and retain a core sample that is then recovered when the string is pulled out of the hole.

a barrel in the drilling BHA with a coring head designed to receive a rock core cut as part of core sampling operations.