Delivering Perforation Strings in Extended-Reach Wells With Coiled Tubing and Hydraulic Tractor

摘要

A new enabling technology of delivering long perforation gun strings and logging equipment into Extended Reach (ER) Wells using coiled tubing assisted by an innovative all hydraulic tractor is presented. Recent operational experience at Chayvo Field in Sakhalin Island Russia on the first ER well illustrates the new capabilities of this approach that delivered coiled tubing strings into a 9,375 meter well, performing multiple perforations and logging operations. Pre-operations equipment qualification testing and downhole modeling methodology for the project are discussed. Sakhalin Island surface equipment and bottom hole assemblies are described along with operational experience and lessons learned that successfully delivered heavy payloads into distant reservoirs beyond coiled tubing lockup.