Designing High-Angle/Casing-Directionally-Drilled Wells

Borland, Brett; Watts, Rick; Lesso, Bill; Warren, T.M.

doi:10.4043/18374-ms

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…Both of these tests provided positive results and significant learning that was of tremendous value for the operation offshore in Norway. 3,4 Conceptual Well Design: Wells at Eldfisk Bravo are generally drilled as cased hole side-tracks out of the existing 13 3/8 in. or 9 5/8 in.…”

Section: Project Planningmentioning

confidence: 99%

“…Tests in previous wells showed two techniques that are effective in combating BHA vibrations. 3,4 These are; 1) stabilize the motor with a custom sized bearing housing sleeve stabilizer inside the casing just above the casing shoe, and 2) use a roller reamer just below the under-reamer to stabilize it and de-couple vibrations traveling in the BHA. These lessons were learned by using downhole lateral, axial, and torsional sensors to record these vibrations during drilling operations.…”

Section: Vibrationmentioning

confidence: 99%

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A Case History of Casing Directional Drilling in the Norwegian Sector of the North Sea

et al. 2008

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In January 2007, ConocoPhillips completed what is believed to be the first well directionally drilled with casing using wireline retrievable bottom hole assemblies from an offshore installation. ConocoPhillips has considerable experience with this technology in reducing drilling days on predominately vertical land wells in South Texas. It was desired to determine if the same benefit could be realized in the offshore environment; where directional drilling is required. A candidate development well was identified in Norway on the ConocoPhillips operated Eldfisk Bravo platform that could benefit from advantages seen with Casing while Drilling. Two land based tests were conducted to confirm the ability to conduct casing directional drilling in wells similar to those expected in Norway. Simultaneously, a detailed plan for drilling the well in Norway was developed.Two production casing strings (10 ¾-in. and 7 ¾-in.) were successfully drilled directionally through the overburden section on the Eldfisk well. The well had a complex 3-dimensional well path with inclination up to 60°. All running and retrievals of the BHAs was planned to be done with wireline and a purpose-built traction winch system rated to a working load of 40,000 lbs. Once the 7 ¾-in. production casing was cemented, the casing string was converted to a production liner with an expandable liner hanger and the upper section of 7 ¾-in. was retrieved. In all, 10,968 ft of the 13,600 ft well was directionally drilled with casing.

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Section: Project Planningmentioning

confidence: 99%

Section: Vibrationmentioning

confidence: 99%

A Case History of Casing Directional Drilling in the Norwegian Sector of the North Sea

et al. 2008

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“…However, most of the recent development work has been aimed at fielding a robust directional drilling system utilizing rotary steerable tools for offshore applications. 24 This work has demonstrated the capability to drill with good directional control using rotary steerable tools at inclinations up to horizontal and to have the reliability needed to retrieve the expensive directional tools in these applications.…”

Section: Directional Capabilitymentioning

confidence: 99%

Drilling with Casing Reduces Cost and Risk

Warren¹,

Houtchens²,

Tessari³

2006

Proceedings of SPE Russian Oil and Gas Technical Conference and Exhibition

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Drilling with Casing Reduces Cost and Risk

Warren¹,

Houtchens²,

Tessari³

2006

All Days

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More than 1.2 million ft of hole has been drilled in over 260 wells with retrievable casing-while-drilling tools. These wells have been drilled with seven casing sizes ranging from 4–1/2″ to 13–3/8″. The drilling system is composed of downhole and surface components that provide the ability to use normal oil field casing as the drillstring so that the well is simultaneously drilled and cased. The casing is rotated from the surface for most operations. The experience gained while drilling these wells has led to a better understanding of the advantages of the process. It's most effective applications have been to reduce the cost and risks associated with wells which routinely experience lost circulation when drilled conventionally; wells in which well control is difficult for tripping drillpipe; wells where excessive fluid loss into low pressure reservoirs impairs the production and ultimate recovery; and wells where it is difficult to get the casing shoe as deep as needed. Introduction Simultaneously drilling and casing a well by using conventional oilfield casing as the drillstring has been a dream of a few drillers since the rotary drilling process was introduced in the late 1800's. One patent1 dating back to 1890 describes a rotary drilling process for simultaneously drilling with the casing (including a sand control screen) and then retrieving the hydraulically expandable bit. Another patent issued in 1926 list the advantages (Table 1) of drilling with casing with a retrievable bit.2 Inventors kept up a steady stream of ideas aimed at fielding a practical system for drilling with casing and a retrievable bit.3–10 Considerable work was done in Russia beginning in the late 1930's to develop a system for replacing the drill bit without having to trip the drillstring. This work was stimulated by the desire to reduce the time spent tripping to replace bits that had relatively short runs.11, 12 Work done by Brown Oil Tools13 in the late 1960's was the first broad effort to develop all the surface and downhole components needed to drill with casing and retrievable bits. This "casing-drilling system" included components forrotating the casing with an electric top drive,gripping the casing without utilizing its threads,locking a wireline retrievable drilling assembly to the bottom of the casing, andusing an underreamer to enlarge the borehole. Ultimately, this work failed because of the inertia in the drilling industry, but it did stimulate the development and commercialization of the top drive. Tesco started development of a casing-while-drilling (CwD) system in 1997 that included the complete system needed to drill with casing. While others had failed to accomplish this earlier, improvements in materials (e.g. PDC cutters for underreamers), increased market applications (particularly related to problems encountered in drilling marginal fields), and the brute determination and financial commitment of Tesco management successfully produced a CwD system that has gained commercial acceptance. This system has proven to be a practical method of solving drilling problems and of reducing drilling costs.14–18 It is currently being used in both onshore applications where entire wells are drilled with casing and offshore applications where specific hole sections are drilled with casing.

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Designing High-Angle/Casing-Directionally-Drilled Wells

Cited by 4 publications

References 6 publications

A Case History of Casing Directional Drilling in the Norwegian Sector of the North Sea

A Case History of Casing Directional Drilling in the Norwegian Sector of the North Sea

Drilling with Casing Reduces Cost and Risk

Drilling with Casing Reduces Cost and Risk

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