Resources Contact Us Home
Continuous circulation drilling method

Image Number 4 for United States Patent #6739397.

Methods and apparati are disclosed for continuous circulation of drilling fluids while adding or removing tubulars to and from a drill string, and also for continuing drilling during the addition or removal of tubulars to and from the drill string.

  Recently Added Patents
Dynamic lookup service in a distributed system
Memory with separate read and write paths
Use of emerging non-volatile memory elements with flash memory
Method, system and computer program product for managing funds in custodial deposit accounts
Method for installing industrial components in an environment
Image sensor pixels with junction gate photodiodes
Method and apparatuses for solving weighted planar graphs
  Randomly Featured Patents
Fullerene derivatives
Security and hurricane shutter
Vehicle map position determining apparatus
High-pressure conveyor for powdery and granular materials
Method of making an optical fiber preform where a second elongation is based on a mark on a glass rod
Perspective with shear warp
Apparatus and method for documenting physical examinations
Absorbent product with release sheet
Front unit of an electrical device