Overburden Drilling System | Down the Hole Drilling Tools

Concentric Casing System

Usually the land surface of the earth is covered with loose, unconsolidated material such as soil, clay, silt, sand, gravel and boulders, which varies in depth from a few centimeters to hundreds of meters.
Maxdrill&#;s concentric casing system is the perfect drilling tool to drill hole in the complex rock formation. Maxdrill offers a wide range of sizes of the concentric casing system from 114mm (4 1/2") to mm (48") to suit your needs.

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Concentric Casing System

Application Range:
The concentric overburden drilling system is widely used to drill in rock formations where ovals and fractures are present.

Design Principles:
The stable and reliable working performance and less vibration of the drill rig.

Different Structures:
Concentric system with ring bits, wing and blocks.

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As a reliable drilling tools manufacturer with a focus on supplying &#;Energy-saving, Economical, Efficient&#; products all along, we gradually become one of the most credible Chinese manufacturers in rock drilling tools industry. Maxdrill is always committed to supplying low cost, high efficiency, energy saving and environment-friendly products for global customers. No matter what types of rocks &#; soft rock, loose-medium rock, hard rock and any other special formations, just tell us what you need and leave the rest to us, and our customer service is always there to help you meet your requirements.

Offshore staff

U.S. patent number US
Appl. Data: 11
Applicant Weatherford/Lamb Inc.
Inventors Galloway, Gregory G. Brunnert, David J.

The invention provides a method and apparatus for setting concentric casing strings within a wellbore in one run-in of a casing working string. In one aspect of the invention, the apparatus comprises a drilling system comprising concentric casing strings, with each casing string having a drill bit disposed at the lower end thereof. The drill bit pieces of adjacent casing strings are releasably connected to one another. In another aspect of the invention, a method is provided for setting concentric casing strings within a wellbore with the drilling system. In another aspect of the invention, the releasably connected drill bit pieces comprise a drill bit assembly.

11/21/

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