Next Generation Technologies for Underbalanced Coil Tubing Drilling

Kozlov, Anton; Frantzen, S.; Gorges, Thomas; Khamees, S.A.; Guzman, Julio C.; Aduba, Anthony A.; Silva, Thiago P. da

doi:10.2118/132084-ms

All Days 2010

DOI: 10.2118/132084-ms

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Next Generation Technologies for Underbalanced Coil Tubing Drilling

Anton Kozlov

S. Frantzen

Thomas Gorges

et al.

Abstract: Technology improvements are continuing to expand the capability of coiled tubing directional drilling (CTDD) worldwide. Increased CTDD activity in advanced underbalanced re-entry applications that require precise wellbore (multilateral) placement and real-time monitoring of downhole parameters has led to the development of bottom-hole drilling assemblies (BHAs) with enhanced functionality. Saudi Aramco identified CTDD as an important technology for redeveloping its gas reserves and is dedicated … Show more

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Cited by 5 publications

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Improved Technology Enhances Gas Production and Decreases Cost In Underbalanced Drilling While Using Coiled Tubing Directional Drilling

et al. 2012

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Drilling re-entry wells with the highest expected production and least possible cost is always the aim of operators. The biggest challenge in gaining maximum reservoir contact when drilling with underbalanced coiled tubing drilling (UBCTD) is when it reaches lock up depths, resulting in weight transfer issues to the bit and reduced reservoir contact. Factors affecting this are formation, well profile, tortuosity, etc. These issues can be mitigated by using a rib-steered motor (RSM), with which it is possible to increase lateral reach by drilling smoother wellbores. One technique is to thoroughly define the primary objective of the well, during the pre-planning stage, not only to increase hydrocarbon recovery, but to improve wellbore quality and minimize tortuosity which helps to achieve a greater reservoir contact. Using underbalanced coiled tubing drilling grants access to new gas-bearing formations in reservoirs that were previously by-passed or missed. The authors present the advantages of using a 3-in. RSM compared to a 2⅞-in. conventional motor, with the help of a case study comparing all RSM and conventional motor runs. It also compares rate of penetration using RSM and 2⅞-in. conventional motor and how it affects the occurrence of lockup while drilling. The paper also details how an underbalanced well in the Middle East for a large operator using the 3-in. RSM managed to complete the well in 24 days, some 18 days ahead of schedule for the Approval for Expenditure (AFE). The same well was also characterized by a number of drilling records that included the longest footage in a 24 hr period and the longest-ever run drilled since UBCTD was introduced. This increased performance can largely be credited to the revolutionary technology that the RSM brings to coiled tubing drilling (CTD), enabling wells to be drilled faster, with significant benefits in reach, steering ability and greater reservoir contact.

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Improved Technology Enhances Gas Production and Decreases Cost In Underbalanced Drilling While Using Coiled Tubing Directional Drilling

et al. 2012

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Fifteen Years of Successful Coiled Tubing Re-entry Drilling Projects in the Middle East: Driving Efficiency and Economics in Maturing Gas Fields

2013

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During the last 15 years, coiled tubing drilling (CTD) projects in the Middle East (ME) have proven an efficient and economic means of increasing and sustaining production for the oil and gas industry. CTD was implemented in 1998 and since then established as a standard, viable solution for the existing re-entry challenges in various maturing fields and applications. During this time frame corresponding technologies and procedures have been developed and continuously improved to address existing and new challenges in this growing market segment. This paper describes the use of CTD from the first activity in Oman through operations in the Kingdom of Saudi Arabia, utilizing project data collected during 15 years of operational experience. The paper includes the technology and procedural changes that addressed new and special challenges observed within the aforementioned projects and drove production from these maturing fields such as: The coverage of low- and high-pressure reservoirs in various fields with high temperature and high H2S challenges.The movement from single re-entry wells to multilateral wellbore designs, alongside the envelope extension from pure directional wellbore placement according to plan, to real-time reservoir navigation by geo- and bio-steering processes.The introduction of special applications such as ERD and precise kick off from vertical wells with coiled tubing (CT) technology.The extension of drilling operations from overbalanced to fully underbalanced (UB) operation, with maximum N2 injection through the CT string and the requirement to deal with production while drilling.Development of other equipment to enable the pressure deployment of the BHA, allowing a move away from conventional tower set-ups to a dedicated highly mobile coil tubing rig. The projects resulted in constant technology improvement and implementation of new developments in all aspects of CTD technology. To achieve the necessary efficiency and economic goals for the re-entry projects, new technology must include downhole bottom hole assembly (BHA) technology, casing exit equipment, surface equipment of the overall rig and other associated equipment such as the underbalanced drilling (UBD) package. Similar to the utilized technology, the corresponding procedures were also optimized and new ones introduced to adapt to changing environments and challenges. Based on the previous and current achievements of CTD in the Middle East, this trend of adjusted developments and continuous improvements will continue to further drive project efficiencies and economics.

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Twenty Years of Successful Coiled Tubing Re-Entry Drilling With E-Line BHA Systems - Improving Efficiency and Economics in Maturing Fields Worldwide

Krueger

Pridat

2016

Day 1 Tue, March 22, 2016

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More than 20 years ago, the first e-line coiled tubing drilling (CTD) systems were introduced. Since then, the technology has evolved and proven to be an efficient, economic means of enabling additional production from aging oil and gas fields. These systems are now established as a standard, viable solution for re-entry drilling in a variety of maturing fields and applications. Corresponding technologies and procedures were developed, and continuously improved.Utilizing project data from more than 20 years of operational experience, this paper describes the progression from the first e-line CTD bottom hole assembly (BHA) applications in Europe through to today's continuous operations in several areas worldwide. It presents the technology changes and procedural adjustments that were necessary to address new challenges related to extending the economic life and improving the production of mature fields by economically accessing stranded reserves, and includes:• Wellbore design changes from single re-entry to multilateral wells, along with the envelope extension from pure geometric wellbore placement according to plan, to real-time reservoir navigation utilizing geo and bio-steering services. • Introduction of special applications such as precise kick-off from vertical, dual casing exits and extended reach drilling (ERD) with CT technology. • Progression from overbalanced drilling operations to full underbalanced (UB) applications, with nitrogen injection through the CT string and the requirement to manage production while drilling. • Equipment development to enable safe pressure deployment of the drilling BHA, enabling a move from conventional tower set-ups to dedicated highly mobile coiled tubing rigs.Continual improvements of technology and steady implementation of new developments in many aspects of CTD technology were the result of innovative re-entry projects executed worldwide. To achieve the necessary efficiency and economic goals, improvements and new technology developments occurred in the downhole BHA technology, casing exit equipment, surface equipment, rig and other associated systems. Simultaneously, processes and procedures were also optimized with new ones introduced to adapt for changing environments and observed challenges.Based on worldwide CTD experience, the trend of technology developments and continuous improvement will continue. The goal is to further drive project efficiencies and economics, enabling the life of maturing fields to be extended, deferring abandonment and improving ultimate recovery.

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Next Generation Technologies for Underbalanced Coil Tubing Drilling

Cited by 5 publications

References 8 publications

Improved Technology Enhances Gas Production and Decreases Cost In Underbalanced Drilling While Using Coiled Tubing Directional Drilling

Improved Technology Enhances Gas Production and Decreases Cost In Underbalanced Drilling While Using Coiled Tubing Directional Drilling

Fifteen Years of Successful Coiled Tubing Re-entry Drilling Projects in the Middle East: Driving Efficiency and Economics in Maturing Gas Fields

Twenty Years of Successful Coiled Tubing Re-Entry Drilling With E-Line BHA Systems - Improving Efficiency and Economics in Maturing Fields Worldwide

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