Patent ID: 7971658
Filing Date: 2011-07-05
Classification: E21B

Abstract:
1. A method for drilling a drain hole from a well in a subterranean formation containing a carbonate mineral, comprising: providing two pumps, a drilling fluid containing an acid and a second solution; placing a work string in the well, the work string having attached thereto a diverter; placing a first and a second tubular in the well within the work string, the tubulars having distal ends and a connector attached to the distal ends, the connector having attached thereto a very flexible tubular, the very flexible tubular having a proximate end attached to the connector and a distal end attached to a jet bit or a micro-jet bit; pumping the drilling fluid through the first tubular and the second solution through the second tubular through the very flexible tubular and out the bit, and dissolving the carbonate material by directing the drilling fluid containing an acid toward the formation thereby forming a drain hole.