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
Method and device for determining processed image data about a surround field of a vehicle
Power saving methods for wireless systems
Substituted indolo 4,3 FG quinolines useful for treating migraine
Method and an apparatus for processing an audio signal
Method and device for the detection of defects or correction of defects in machines
Dose escalation enzyme replacement therapy for treating acid sphingomyelinase deficiency
Native NAD-dependent GAPDH replaced with NADP-dependent GAPDH plus NADK
  Randomly Featured Patents
Cleaning apparatus
Suction pump for draining body fluids from body cavities
Method of treatment of conditions by administration of streptolysin O
Transaction product with hinged puzzle segments
Monobore riser
Preparation of diagnostic agents
Enabling mid-call services to be added to a communication session by a wireless device
Fluid container
Semiconductor module having antenna element therein
Electric motor