Press Esc to close

WorldOil

CONTENT PREVIEW

For full content view: Log in Now!

  • Drilling advances


    Les Skinner, Contributing Editor

    Recently, new drilling mud formulations have been popping like mushrooms in a cow pasture. These systems have been developed to improve hole cleaning, provide lubrication, reduce contamination, increase rheology control and reduce formation invasion-all problems of many former systems, especially water-based muds. In the past, prior to synthetic oil-based systems, we were obliged to use water-based muds with monovalent or divalent salts such as potassium chloride to “pickle” shales. This was only partially successful in preventing sloughing, produced by shale hydration, which caused many junked hole segments. Crude and diesel oil-based muds followed, but discharging them into the environment was not only damaging, it was illegal in most places. Why create an intentional oil spill by discharging whole mud or oil-soaked cuttings? Vegetable oils in drilling fluids came next followed by synthetic oils; both were expensive. Discharging a plant-based oil into the environment didn’t seem quite as bad as discharging a refined product.

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