| Abstract |
In Iceland, efforts to drill High Temperature and High Pressure wells have proved very successful in recent years. In 2001, only two HT wells were completed, whereas 27 wells were completed, in 2007 and a similar amount will be drilled in 2008. High accuracy and reliability of data from deep high temperature wells has been the main driving factor for Iceland GeoSurvey to implement the latest electronic instruments (Dewar flask tools), from Kuster Co., California, the so-called K10 (Strain tool). As a consequence the classical mechanical Amarada and Kuster tools were retired to back-up tools. Though the mechanical tool are sturdier tools the data quality and resolution is not up to date with respect to client requests. An introduction of new drilling technology, mainly for environmental reasons and in order to intersect fractures perpendicularly, meant a shift from drilling near vertical wells to deviating around 90% of the wells. As a direct result of this shift Iceland GeoSurvey is the logging contractor in the world logging most intensively in deviated wells. In logging, the first concern is to obtain data from the entire length of any given well i.e. getting successfully down the well and retrieving the tool. A few problems have occurred during the past four years: extremely corrosive geothermal fluid (Reykjanes area) causing brittle failure on the slick-line; highly inclined wells (~40-60 |