Drilling fluids

摘要

The invention relates to methods for drilling wells into subterranean formations containing oil, gas or other minerals for the purpose of extraction and production of said minerals. In particular, the invention relates to drilling fluids used in such methods and the use of starch in such fluids. The invention provides a method for drilling a well using a drilling fluid comprising a starch obtained from tubers or roots, said starch containing virtually only amylopectine molecules. In a preferred embodiment of the invention, said starch is derived of a genetically modified amylose-free potato.