Join
today

Boliven PRO is more than just patent search

  • Build and save lists using the powerful Lists feature
  • Analyze and download your search results
  • Share patent search results with your clients

Patents »

US5029654: Bendable drilling sub

Share

Filing Information

Inventor(s) Murray Wilson · Winston Smith ·
Assignee(s) WILSON MURRAY · SMITH WINSTON ·
Attorney/Agent(s) George Haining Dunsmuir ·
Primary Examiner Hoang C. Dang ·
Application Number US7552987
Filing date 07/16/1990
Issue date 07/09/1991
Predicted expiration date 07/16/2010
U.S. Classifications 175/74  · 175/256  ·
International Classifications E21B 708  ·
Kind CodeA
International Classifications 17574;75;73;256;320 ·
6 Claims, No Drawings


Abstract

A bendable sub for use in the drilling string includes an elongated tubular mandrel with a threaded top end for mounting the mandrel at the bottom end of a drilling string, a lock nut threaded onto the body of the mandrel between the ends thereof for vertical movement, a coupler slidably mounted on the mandrel beneath the lock nut for movement between a release position and a locking position, the coupler being non-rotatable on the mandrel, a sleeve on the mandrel beneath the coupler with a tapering passage extending therethrough, a latch between the coupler and the sleeve for releasably connecting the coupler to the sleeve, and a retaining nut on the bottom end of the mandrel beneath the sleeve for retaining the latter on the mandrel, at least the bottom end of the coupler and the top end of the sleeve being inclined with respect to the longitudinal axis of the mandrel, whereby the sleeve can be tilted or inclined with respect to the mandrel to form a bend in the drilling sub.

Independent Claims | See all claims (6)

  1. 1. A bendable drilling sub comprising elongated, tubular mandrel means having a single longitudinal axis extending the entire length thereof; first thread means on a top end of said mandrel means for mounting said mandrel means in a drill string; lock nut means for mounting on said mandrel means, when on said mandrel means, said lock nut means being axially movable on said mandrel means between a release and a locking position; coupler means for slidable mounting on said mandrel means beneath said lock nut means for movement between a release position and a locking position; sleeve means for mounting on said mandrel means beneath said coupler means; tapered passage means extending from the top to the bottom of said sleeve means; latch means on said coupler means for releasably connecting said coupler means to said sleeve means; and retaining nut means for mounting on the bottom end of said mandrel means beneath said sleeve means for retaining said coupler means and said sleeve means on the mandrel means, the bottom end of said coupler means and the top end of said sleeve means inclined with respect to the longitudinal axis of said mandrel means, whereby said sleeve means can be inclined with respect to said mandrel means to form a bend in the sub.
  2. 6.6. A bendable drilling sub comprising elongated, tubular mandrel means having a single longitudinal axis extending the entire length thereof; first thread means on a top end of said mandrel means for mounting said mandrel means in a drill string; lock nut means for mounting on said mandrel means, when on said mandrel means, said lock nut means being axially movable on said mandrel means between a release and a locking position; coupler means for slidable mounting on said mandrel means beneath said lock nut means for movement between a release position and a locking position; sleeve means for mounting on said mandrel means beneath said coupler means; tapered passage means extending from the top to the bottom of said sleeve means; latch means on said sleeve means for releasably connecting said coupler means to said sleeve means, said latch means including a ball extending downwardly from the bottom end of said coupler means; and a plurality of recesses in the top end of said sleeve means for receiving said ball; and retaining nut means for mounting on the bottom end of said mandrel means beneath said sleeve means for retaining said coupler means and said sleeve means on the mandrel means, the bottom end of said coupler means and the top end of said sleeve means inclined with respect to the longitudinal axis of said mandrel means, whereby said sleeve means can be inclined with respect to said mandrel means to form a bend in the sub.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US4077657 Smith, International, Inc. Trzeciak Mar 1978
US4220214 BENOIT LLOYD F Benoit Sep 1980
US4303135 BENOIT LLOYD F Benoit Dec 1981
US4522272 Baker Oil Tools, Inc. Beimgraben Jun 1985
US4694914 Alsthom Obrecht Sep 1987
US4745982 WENZEL KENNETH H Wenzel May 1988
US4813497 WENZEL KENNETH H Wenzel Mar 1989
US4817740 Baker Hughes Incorporated Beimgraben Apr 1989

Patent Family

The current document is not in a family.