Apparatus for retrieving drill collars

Details Apparatus for retrieving drill collars Apparatus for retrieving drill collars

1979-02-23

1981-07-14

Leppink, James A.

Wells

With explosive or gas generating means in well

166242, 166297, 102313, 285 4, F42B 300, E21B 2900

Patent

active

042781272

ABSTRACT:
An apparatus for retrieving drill collars in an earth boring drill string when stuck. A sub is connected between two drill collars at various points. Each sub is a cylindrical member with a reduced annular or notched area at one point that is no greater in wall thickness than the drill pipe. A locator is secured to a wire line and lowered into the drill string to the vicinity of one of the subs located above the stuck point. The locator carries an explosive charge of capacity sufficient to cut drill pipe. The locator has a pivotal dog that engages a landing in the sub. The landing is spaced above the annular area a distance selected to position the explosive charge adjacent the annular area when the dog engages the landing.

REFERENCES:
patent: 1783605 (1930-12-01), Della
patent: 1814800 (1931-07-01), Heeter
patent: 2673614 (1954-03-01), Miller
patent: 3053182 (1962-09-01), Christopher
patent: 3105548 (1963-10-01), Ownby
patent: 3233688 (1966-02-01), Bell
patent: 3417822 (1968-12-01), Howell
patent: 3712378 (1973-01-01), Oliver
patent: 3869150 (1975-03-01), Brown
patent: 4042019 (1977-08-01), Henning
patent: 4184430 (1980-01-01), Mock

Affiliated with

Also associated with

Rating

Apparatus for retrieving drill collars does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for retrieving drill collars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for retrieving drill collars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2160635