Resources Contact Us Home
Method and apparatus for forming a window in a subsurface well conduit

Image Number 4 for United States Patent #5484021.

A method and apparatus for forming a window in well casing. First, using coiled tubing, a two stage whipstock is set in the well casing through the production tubing. Next, a jointed milling assembly is inserted through the production tubing, also using the coiled tubing. The travel of the mill is guided by the two stage guide surface of the whipstock, and the joint in the milling tool allows the direction of the mill to change. Thus, the mill impinges on the well casing at a relatively acute angle to the longitudinal axis of the casing reducing the likelihood that the mill will bite into the guide surface of the whipstock instead of the well casing.

  Recently Added Patents
Flame-proofed thermoplastic compositions
Sperm factor sequences
People engine optimization
Electronic hand-held device
Pressure roller and fixing device equipped with the same
Information storage medium, reproducing method, and recording method
Method of forming a power supply controller and structure therefor
  Randomly Featured Patents
Optical disc apparatus, an optical disc method, and a semiconductor integrated circuit capable of adjusting a focus position of a light beam and a spherical aberration
Cigarette lighter securing accessory
Image identification method and imaging apparatus
Mixture metering arrangement for an internal combustion engine
System for the spraying of spray liquid for aircraft windshield, and cockpit provided with such a spraying system
Worktable and viceclamp
Image information recognition apparatus
Reverse battery protection device containing power MOSFET
Hose stiffening sleeve
SiC whisker and particle reinforced ceramic cutting tool material