Technical Parameters

Product Description

Drill collars are integral heavy-wall joints that are manufactured from a solid bar of modified alloy steel. The solid bars are quenched and tempered to obtain the mechanical properties, then trepanned drifted and threaded. All drill collars are heat-treated with hardness within 285 to 341 BHN, which are guaranteed one inch below the surface pipe.

Lake Petroleum could supply slick type drill collar, spiral drill collar and non-magnetic drill collar (NMDC).

Features

(1). Hardness range of 285~341 BHN and a charpy impact value of 40 ft / lbs are guaranteed for evenly distributed 16 points in any cross sections at room temperature.

(2). Connections are phosphate coated father machining to protect the thread from corrosive elements and to prevent galling upon initial make-up. Thread roots are cold rolled on API and H0-90 connections.

(3). Pressed steel thread protectors are supplied to all drill collar that are equipped with standard connections.

(4). Manufactured strictly according to API standard.

(5). Widely used in oil, gas, HDD and geothermal field.