Field results

Field Results – Ivar Aasen

First case report with practically full AST implementation

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Field Results – Challenging Coring

Some wells are drilled primarily to retrieve cores. This puts a lot of pressure on the drilling engineers to find methods that moves the recovery factor beyond that of good luck. This coring case is presented because it gave full core recovery AND also provided for documentation of the vibration challenges from MWD recordings.

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Drilling basement rock

New, counterforce assisted XC-AST Reveal Hard Rock Potential with PDC Bits

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Field Results – Improved Productivity in Rough Seas

The AST saved at least on day on each section drilled compared to previous wells having the same sea conditions.

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Field Results – Fast ROP in Hard Chalk: Proving a New Hypothesis for Drilling Dynamics – SPE 173068

Drilling hard carbonates is often a costly affair with slow ROP and equipment damage. At the international IADC/SPE Drilling Conference in London 2015, Norwegian operator Det norske together with a joint team of suppliers including Tomax presented a paper on how to drill these hard carbonates with fast ROP:

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Field Results – Improving deepwater efficiency

Deepwater exploration from large drillships is on the rise. These vessels offer great benefits in terms of mobility and capacity but, from a drilling perspective, they may sometimes present challenging motion characteristics that are transmitted all the way to the bottom of the hole.

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Field Results – Replacing limiting drill-bit features by AST

Torque arrestors and other features are added to reduce vibrations and to keep PDC drill bits safe. ROP however suffers. The AST allows for the fast, aggressive bits to be used again.

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Field Results – Drilling long, fast laterals for unconventional shale resources

Drilling, shale, play, unconventional, lateral, Permian, Eagle Ford

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Field Results – Under-reaming a difficult, fractured formation

A troublesome formation known to lock-up the cutters and cause twist-offs was to be drilled with under-reamer. An AST was deployed to solve the problem.

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Field Results – Vibration challenges in top-hole drilling

Severe drilling vibrations in top-hole section created unacceptable noise and risk. An AST was implemented to solve the problem.

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Field Results – Drilling long HTHP multi-lateral wells

The AST principle provides a stabilized load on the bit in lateral and extended reach wells to prevent erratic reactive torque that would otherwise reduce drilling efficiency.

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Field Results – Drilling three geological periods in one drill-bit run

Use of very aggressive PDC cutters, a RSS system with a mud motor and an AST produced a steady cut through hard limestone and repeatedly drilled sections to TD in one run.

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Field Results – Drilling with slim motor BHA from floating rig

Drilling a slim hole from a semi-submersible in rough seas was almost impossible due to inadequate load on the heave compensator system. AST was called out to solve the problem.

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Field Results – Drilling difficult sediments and hard chalk, offshore UK

Offeset data stated a minimum of two bit run was needed to reach TD in a Central North Sea well. By deploying an AST and aggressive cutters, the section was drilled in one fast run with minimal wear.

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Field Results – Using AST for directional drilling with rig heave

Bad weather on floating drilling facilities can make the heave compensator struggle and the WOB becomes unstable. An AST can be used to improve on this.

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Field Results – Milling Production Packer on drill-pipe

A production packer was set in the wrong place and needed milling out from inside a new, high grade tubing. In order to safely mill the packer with minimal risk to the tubing, an AST was used.

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Field Results – Reducing surface drilling torque in ERD well

The maximum drilling torque supplied from the Top Drive is defined by the highest peaks produced downhole. An AST can be used to reduce such downhole peaks.

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Field Results – Milling damaged pipe on coiled tubing

Milling collapsed pipe is difficult and in this case it was done deep down in an extended reach well. To be able to land and engage the mill, two AST tools were run in tandem.

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Field Results – Drilling a slim lateral in chalk

Drilling of slim diameter laterals in the Southern North Sea carbonates can be troublesome due to friction. In this case a new lateral was drilled in an old field using AST technology.

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Field Results – Milling large composite plug on coiled tubing

Use of composite plugs makes milling faster, but in this case a plug set in a 7” liner had to be milled by a 2 7/8” motor on coiled tubing with limited power reserves.

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