Patent ID: 6658981
Filing Date: 2003-12-09
Classification: E21B

Abstract:
A method of perforating a casing of a well below a smaller diameter production tubing string, comprising the steps of:conveying a through tubing retrievable bridge plug through the production tubing string into the casing; setting the through tubing retrievable bridge plug into engagement with the casing; lowering a first perforating gun section through the tubing; landing the first perforating gun section onto the through tubing retrievable bridge plug; lowering at least one additional perforating gun section through the production tubing; landing the first at least one additional perforating gun section onto the first perforating gun section; lowering a firing head on to a top perforating gun section; firing said perforating gun sections and perforating the casing; releasing said through tubing retrievable bridge plug from engagement with the casing after firing the perforating gun sections; and retrieving the through tubing retrievable bridge plug from the casing through the production tubing.