New Washpipe Technology: Why Operators Should Care

Abstract

This paper will outline the application of a breakthrough technology to address Top Drive washpipe durability in high temperature and high pressure (HPHT) wells. The introduction, application, and submission of a performance comparison to support the advancement/proliferation of this technology are presented from an operating company's perspective. Problem Since the introduction of Top Drive Systems in the late 1980's, a consistent limiting factor has been the durability of the washpipe seal mechanism, particularly in HPHT + high speed drilling applications. This durability issue has greatly affected the efficiency of the circulation system's integrity, and it has also decreased overall operating efficiencies. Washpipe failures occurring during critical operations, such as during well control situations, can increase risk to personnel and equipment. Solution National Oilwell Varco has introduced a technical solution that utilizes mechanical sealing technology developed outside the oil and gas industry. This technology has proven itself in joint-effort field trials by ConocoPhillips and Ensco in the North Sea. The challenge is to promote the use of the technology worldwide to solve the habitual washpipe durability problem. Challenges to Implementation Traditionally, new technology is difficult to implement in the oilfield. The intent of this paper is to help overcome typical barriers and help rush this solution out to positively impact the drilling fleet as quickly as possible. Conclusions A reliable sealing mechanism has been identified to address the washpipe durability issues, and field trials on this new product have yielded positive results. The typical barriers to product implementation were minimized by applying previous lessons-learned, with successes in operations, cost savings, and safety. Introduction Washpipe technology has remained rather stagnant since its introduction on conventional swivel and kelly drilling applications, and then subsequently adapted to Top Drive Systems in the early 1980's. Failure rates after 200 to 600 hours have become an accepted norm in many drilling operations. To compound the issue, as the industry moves into applications of increased pressure, temperature and speed, a washpipe's seal life has significantly decreased, often failing while operating in the most critical parts of the well. Through a partnership between National Oilwell Varco (NOV) and the Deublin®Company, a mechanical seal washpipe has been developed as an answer to these issues, resulting in significantly higher run times at a variety of pressures, temperatures and rotating speeds.