Horizontal Well Break Out Session

Feb 24, 2015

Moderators:Rob SuttonDave SaskGordon Gates

Discussion Points

• EOT Landing Depth• Toe-up / Toe-down

– Are undulations & traps okay?• Salt problems

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EOT Landing Depth• Flowing Well

– 5-50 ft above deepest point in the curve – Fayetteville, low water rate (8-10 BWPD or less), No

Pkr, mainly toe up• 75-82°, 60-75° or >82° (same), 45-60°, 30-45° & <30°

(best to worst)• >15 ft TVD above deepest point in the curve (no more

than 20 ft TVD) – 76° (Old UPRC paper)– Barnett (more water production) 65-75°– Tubing close to 90° may enhance loading & slugging– Need for a predictive tool 3

EOT Landing Depth• Artificial Lift

– Tend to run tubing deeper– Barnett gas lift set EOT close to top perf or near

90°– Carthage Field, James Lime gas lift 2-3/8 at 70°

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Lateral Orientation & Traps

• General consensus for gas wells is toe up• Undulations & Traps

– No difference in performance first 2 years– Problems later in well’s life (> 2 years)– Operators trying for smoother laterals

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Salt Problems/Solutions• Salt Problems

– Examples from Marcellus, Haynesville, Woodford, Barnett, Duvernay & Jean Marie (Canada)

– Problems also have been identified in lateral

• Solutions– Fresh water dumped down casing can handle

salt in issues in vertical wells or in heel of hz wells

– Salt blockages in hz wells generally require CT invention with jetting tool

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