Removal of Debris From Deepwater Wellbores Using Vectored Annulus Cleaning System Reduces Problems and Saves Rig Time

Abstract

Debris management is a major concern for producers. Wellbore debris is responsible for many of the problems and much of the extra cost associated with extreme water depths and highly deviated holes. This paper discusses procedures and tool systems developed to optimize the efficiencies and economics of debris removal. Issues pertinent to deepwater wellbore cleaning will be discussed, along with the problems associated with removal of debris caused by perforating, milling, etc. The authors will outline techniques for removal of this debris and discuss a tool system that is a workable solution for these problems. This paper will focus on the use of a Vectored Annulus Cleaning System to remove debris from areas of the wellbore that have normally proven very difficult. The system has been shown to be effective in removing debris from problem areas such as above liner tops or where casing size changes, areas with a loss of annular velocity, and in wells with little to no circulation. Case histories from the Gulf of Mexico and the North Sea will demonstrate how this technology has reduced problems of debris removal while saving rig time by eliminating trips.