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If Vertical wells could Talk SPE Luncheon Back to Basics February 14, 2013 R.P.(Pete) Singbeil, P.Eng Principal, Intro

If Vertical wells could Talk SPE Luncheon Back to Basics February 14, 2013 R.P.(Pete) Singbeil, P.Eng Principal, Introspec Energy Group Inc. Case Study: Dawson Montney. Source: Podunk website. Source: Homesteaders Heritage (~1940’s). Resource Play Types / Forecasting. Resource Plays

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If Vertical wells could Talk SPE Luncheon Back to Basics February 14, 2013 R.P.(Pete) Singbeil, P.Eng Principal, Intro

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  1. If Vertical wells could Talk SPE Luncheon Back to Basics February 14, 2013 R.P.(Pete) Singbeil, P.Eng Principal, Introspec Energy Group Inc.

  2. Case Study: Dawson Montney Source: Podunk website Source: Homesteaders Heritage (~1940’s) Introspec Energy Group Inc.

  3. Resource Play Types / Forecasting Resource Plays - “Untapped” (RF near zero) - “Halo” step out from production (k Halo << k Prod) - “Challenged” (RF low with verticals) RF = Recovery Factor Type Well Forecasts - Production Statistics (years) - Technically derived Forecasts (Months or Days) - Both methods together is preferred - Observing high aspect ratio “flow” in many Consistency in the results is key RF is also a reality check to the forecast and the thirst for capital (well spacing, length, completion) Introspec Energy Group Inc.

  4. Dawson Case Study • - Dawson Montney Discovery Star Oil & Gas 09-31-079-14W6 (Vertical) • RR TD Kskn June 2000, Completed Montney October 2000 • Gelled oil frac with 15t of proppant; IP 3MMscf/d Parkland Dawson Sunrise Swan Larger wells on Map RR prior to Discovery Map: geoLogic Systems(geoScout) BC AB Introspec Energy Group Inc.

  5. Dawson Production History H Producing count peaked at 64 V Producing count peaked at 66 Rate ~ 163 MMfc/d or 2.5 MMcf/d/well Cumulative ~V 39 + H 160 ~200 Bcf Cartesian Plot Introspec Energy Group Inc.

  6. “Talking” Vertical wells • Often free data as they already exist in the usual graveyard of past economic atrocities of a Resource Play • Logs / Cores / Cuttings • Drilling and Completion History • Production History • Drill Stem Tests • Pressure Transient and Static tests • Fluid Composition and Density • All wells can “Talk” but need interpretation. Introspec Energy Group Inc.

  7. Pressure Transient Analysis Capture: - Pressure Transient Tests (Well Tests) - The Big Well Test (Production) Depth of investigation is a function of time and permeability (ie independent of rate) Raw data is public information available from government Introspec Energy Group Inc.

  8. Dawson Discovery Well Test Initial Pressure is often underestimated! It is a key match point Introspec Energy Group Inc.

  9. Common Diagnostic Type Curves Vertical well Infinite Reservoir (Radial flow) Vertical well Hydraulically Fractured (Linear flow) Zero slope gives kh Permeability is obvious Inside the “Halo” Permeability is implied Resource Plays look like this Introspec Energy Group Inc.

  10. Dawson Discovery Diagnostic Plot No observed radial flow to calculate a unique value of flow capacity (kh) Introspec Energy Group Inc.

  11. Dawson Discovery Well Match “Moment of Truth” is the match of the interpretation consistent with Initial pressure and Drawdown history? 350 Mcf/d Matched to a Section in Drainage area! Introspec Energy Group Inc.

  12. Generic Initial Pressure sensitivity to k 20 Mpa Initial Pressure is usually underestimated 16 Mpa Source: R Bachman, R Hawkes Introspec Energy Group Inc.

  13. Dawson Challenges and Actions • Threshold economics due to volatility in gas price • Capital and Resources put to work: • Land • Delineate map sheet • Initiate facilities & marketing plans • Full Scale Development Engineering Study • Type well and expected variance? • Required capacity? • Cost and efficiency of deployment? • Does any of this sound familiar to you? Introspec Energy Group Inc.

  14. Gordondale Analogue Analogue was stratagraphically lower than was encountered at Dawson. Log analysis and cores confirmed it was very alike lithologically. Dawson Gordondale. 6 miles Completion data from the public record was also reviewed at Gordondale. Map of available wells in 2000 Introspec Energy Group Inc. Map: geoLogic Systems(geoScout) BC AB

  15. Gordondale Production Introspec Energy Group Inc.

  16. Gordondale Normalized Introspec Energy Group Inc.

  17. Gordondale Analogy The “talking” Vertical wells PTA revisited kh revised << public mD-m Do your own interpretation as the public data set is focused on AOF and Reservoir Pressure Introspec Energy Group Inc.

  18. Gas Well Time to PSS Introspec Energy Group Inc.

  19. Dawson Workflow in 2001 Study new well tests from delineation wells at Dawson Re interpret and normalize Gordondale well tests Match observed production of Gordondale Dawson Revised Workflow in 2013 As above Modified Fetvovich to observe flow regime Expect high aspect ratio flow in Resource Plays High aspect ratio flow regimes are observed for many years (rectangle with one side much longer than the other) and it is not just the fracture treatment on the well Introspec Energy Group Inc.

  20. Fetkovich Plot Fetkovich (1980) type curve including the transient radial solution with Arps (1956) decline curves Vertical and modern Hz welldatasets! Recently modified to first order material balance time for early time forecasting Introspec Energy Group Inc.

  21. Aspect Ratio Model (Radial) End of Linear Transition to Radial 560 560 560 560 5280 ft Introspec Energy Group Inc.

  22. Aspect Ratio Model (Linear) Linear Remains Linear 560 1000ft 5280 ft Introspec Energy Group Inc.

  23. Modified Fetkovich (Gordon) X Axis = Cum Gas/Qg Introspec Energy Group Inc.

  24. Modified Fetkovich (Gordon) Transient Flow Bounded Flow 1/1 Slope = Grey ½ Slope = Blue ¼ Slope = Orange Introspec Energy Group Inc.

  25. Modified Fetkovich (Dawson) 2003 Vertical wells X Axis = Cum Gas/Qg Introspec Energy Group Inc.

  26. The Horizontal Well “Genie” • EFFECTIVE • Wellbore length and producing hydraulics? • Spacing of stimulated intervals? • Hydraulic Fracture (both creation and prod)? • Well spacing to achieve recovery factor? • Armed with a credible estimate of permeability, a comparison of the observed production response to completion and drilling parameters may validate the well effectiveness • Sound technical work is inexpensive in the “big picture” Introspec Energy Group Inc.

  27. Modified Fetkovich (Dawson) Choked flow 2009 Hz wells X Axis = Cum Gas/Qg Introspec Energy Group Inc.

  28. The Game of “Clue” Identify type (Untapped, Halo, Challenged) Use all available well tests /production data! Engineer the development, its never going to be a “Farm” - Operated well files / Public data - Daily data from your field data capture systems - Review your data capture requirements forward Modified Fetkovich is excellent at identifying flow regimes using old equations for both Vertical and Horizontal wells High Aspect ratio flow enables a Geological discussion Introspec Energy Group Inc.

  29. Credits: Bob Bachman, Taurus Reservoir Solutions References: SPE162813 A Mogensen, R Bachman, RP Singbeil Evaluation of Horizontal Well Multi Stage Fracturing in the Viking Formation SPE162630 R Freeborn, B Russell, W Keinick Creating Analogs, Fact and Fiction Introspec Energy Group Inc.

  30. Questions? R.P.(Pete) Singbeil, P.Eng Principal, Introspec Energy Group Inc. (403) 775-0046 www.introspec-Energy.ca psingbeil@introspec-energy.ca

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