Abstract
AbstractThe need for a drilling fluid that will exhibit its basic requirements at temperature levels high enough to be used for geothermal drilling has prompted studies of various systems.1 The temperature range of some of these studies has been between ambient temperature and 700°F (370°C). A system was developed that exhibited the desirable properties of a good drilling fluid system at elevated temperatures and pressures. A fluid that exhibited these desirable properties after being subjected to high temperature and pressure was unusual as compared with presently used fluids. Therefore, investigation into why these fluids were capable of exhibiting good rheology and fluid-loss control was conducted. It was found that certain mineralogical components of the drilling fluid undergo transformation after being subjected to high temperatures and pressures. The conversion is temperature dependent but also is affected by the presence of various salts as well as the presence of silica and calcium.The fluids under investigation contained the mineral sepiolite as the basic ingredient. The changes in the sepiolite are reported in this paper.
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