... are also discussed. Introduction Underbalanced drilling is utilized worldwide for the drilling of horizontally and vertically oriented wells to increase rates of penetration, reduce invasive formation damage and reduce significant problems with drilling due to lost circulation and differential sticking...

... Abstract While drilling in some oil fields of the world, loss circulation may be so severe that normal remedies that might heal the loss zone are not effective. Procedures have been developed to drill "blind" or without returns. The procedures have been refined enough so that stuck drill pipe...

... levels of thermal conductivity. This paper discusses the results of two years of application in the Canadian oilwell cementing industry. Descriptions of various applications of the material aregiven. These include offshore applications, applications in severe lost circulation areas requiring very low...