Press Esc to close

WorldOil

CONTENT PREVIEW

For full content view: Log in Now!

  • Drilling advances


    Les Skinner, Contributing Editor

    Steering the bit. The drilling industry is steeped in traditions most of which change slowly over time, if they ever change at all. For generations, drillers endeavored to drill straight, vertical holes. The tradition came from cable tool drilling, which required vertical holes for the system to work. Then, as technologies improved and the need for “slant” holes became apparent, drillers decided that they could drill directionally. Thanks to Mr. Hughes, the rotary bit replaced cable tools, but holes were still drilled vertically. The inclination angle was measured with a “single shot” inclination tool that used gravity to mark a tin or brass sheet using a stylus. Unfortunately, Mr. Hughes’ original bit was a two-cone bit, which we now know is an excellent bit for building deviation angle. Upshot: some of the new rotary holes began drifting off vertical. To the surprise of many, drilling continued in these early crooked holes.

This area of the site is restricted. In order to gain access, please either Log In, or subscribe to World Oil.

Two options are available to you for creating an account.

1. Get a Free Trial Subscription to World Oil Magazine and gain immediate access to select content on World Oil Online.

Start a Free Trial Subscription and gain immediate access to the complete current issue of World Oil Magazine. Plus, you’ll receive 3 upcoming issues of World Oil Magazine in print or digital format.* You also receive access to the Energy Events Calendar, Industry Statistics and WO Wire’s news and industry coverage.

Free Trial


2. Purchase a subscription to World Oil magazine and gain immediate and complete access to World Oil Online. As a Total Access subscriber you will have access to all areas of the site available to registered users and free subscribers as well as having access to such premium content areas as:

  • The Archives section containing over ten years of complete magazine archives,
  • The WO DataHub's engineering tables and directories,
  • The World Oil annual forecasts, including past predictions,
  • Select World Oil technical handbooks,
  • And much, much more!

Subscribe


Physical copies of this content may be available for purchase. Visit the Reprints & Back Issues section.


If you are already a paid subscriber and do not have access, please email CustomerService@worldoil.com.

WO DATA HUB

EngineeringTablesIcon-Large

Engineering Data Tables

World Oil's specialized upstream Engineering Data Tables featuring the Drill Bit Classifier, Tubing Tables and more. Get Total Access today.

WO SUPPLEMENTS

2013 Fracturing Technology

2013 Fracturing Technology

ENERGY EVENTS

Upcoming Events