More Than Painting The Line: Optimizing Asset Value With Wellbore Placement

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Sybil Pearson
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1 More Than Painting The Line: Optimizing Asset Value With Wellbore Placement Marc Willerth VP of Survey Technologies, MagVAR May 22nd, 2018 Slide 1

2 Asset Optimization: Longer Laterals and In-fill drilling More aggressive lateral spacing 660ft? 440ft? Closer? Maintaining the proper distance for longer spans 10,000ft? 15,000ft? Longer? Slide 2

3 Drilling Window: Allowable deviation from the planned spacing Tight limits to achieve asset goals Drilling window Example: 50ft left/right 20 ft up/down The farther you drill, the more of a challenge it becomes Slide 3

4 Major Efforts Are Made to Drill More Accurately Slow slides Time Technology Rotary Steerable Systems Oscillating Top Drives Fluid Additives Trip for BHA Change Agitators Money Slide 4

Uncertainty Survey EoUs are much larger than drilling windows

5 The Conundrum for Long Laterals Ability to hit a target is limited by Survey Accuracy, not Drilling Accuracy Ellipse of Uncertainty Survey EoUs are much larger than drilling windows Asset value comes from true position, not reported position Slide 5

6 Drilling Uncertainty vs Survey Uncertainty Driller s Window Left / Right 50ft Up / Down 20ft Well Plan Gunbarrel View of Drilling in the Lateral Slide 6

7 Drilling Uncertainty vs Survey Uncertainty 160ft Driller s Window 20ft 400ft 50ft MWD Survey Accuracy Slide 7

8 Drilling Uncertainty vs Survey Uncertainty 160ft Driller s Window 20ft 400ft 50ft MWD Survey Accuracy Drilled perfectly to plan, 19 out of 20 wells will not actually be in the drilling window The limitation is on the survey, not drilling practices Slide 8

9 Implied Targets Where is the Well Really? Drilling at the edge of the Window + Survey Uncertainty 180ft Implied Geological Target 450ft What you can actually hit while drilling is a combination of the drilling window and your survey accuracy Slide 9

10 What Drives MWD Survey Uncertainty? Mapping Magnetic North (Reference Errors) Steel in the BHA (Drillstring Interference) External to the surveying tool Tool alignment with the Borehole (Sag) These errors are not specific to a vendor, drilling style, or drilling technology, they are a consequence of MWD surveying Slide 10

11 How Do We Reduce Uncertainty? Reference Errors à Better Mapping: In-Field Referencing Slide 11

12 How Do We Reduce Uncertainty? Reference Errors à Better Mapping: In-Field Referencing DSI à Processing Survey Data: Multi-station Analysis Reported Survey Corrected Survey Slide 12

13 How Do We Reduce Uncertainty? Reference Errors à Better Mapping: In-Field Referencing DSI à Processing Survey Data: Multi-station Analysis Sag à BHA Modelling: Sag Corrections All solutions are data-driven, not a drilling practice change Reduces vertical and horizontal uncertainty by ~50% Slide 13

14 Survey Corrections in the Permian (10k Lateral) >500 real wells 300 Difference Between Reported and Corrected Positions at 10,000 ft (Permian Basin, n=514 wells) Median Difference: ~50ft ~20 operators ~25 vendors All BHA types Number of Wells th Percentile: ~250ft The EoUs are real! 50 0 [0,50] (50,100] (100,150] (150,200] (200,250] (250,300] (300,350] (350,400] (400,450] (450,500] (500, ) Horizontal Displacement (ft) Slide 14

15 What This Means For the Asset Drilling more accurately is limited by surveying Survey corrections often larger than a typical drilling window Value can be driven through survey practice improvements Enable greater flexibility on drilling Any discussion of spacing should start with surveying Slide 15

16 Revisiting Our Target More Accurate Survey 200ft 80ft Better survey practices can cut the positional uncertainty in half Slide 16

17 Revisiting Our Target Bigger Driller s Window 80ft More Accurate Survey 200ft 100ft 40ft This enables opening up the drilling window Slide 17

18 Revisiting Our Target Bigger Driller s Window 80ft More Accurate Survey 200ft 100ft 40ft 180ft Smaller Implied Target 300ft Final target still lands in an overall smaller space Slide 18

19 Revisiting Our Target Bigger Driller s Window More Accurate Survey 100ft 40ft 180ft Smaller Implied Target 300ft More flexibility in drilling and more certainty in spacing Easier to drill with a higher value for the asset Slide 19

20 Recap Spacing objectives need better surveys more than better drilling Reducing positional uncertainty is vital to asset value Open up drilling windows while still delivering more consistency Slide 20

21 Thank You! Questions / Discussion? 300 Difference Between Reported and Corrected Positions at 10,000 ft (Permian Basin, n=514 wells) Number of Wells [0,50] (50,100] (100,150] (150,200] (200,250] (250,300] (300,350] (350,400] (400,450] (450,500] (500, ) Horizontal Displacement (ft) Stop by booth 500 Slide 21

Report. Challenges Related to Positional Uncertainty. for Measurement While Drilling (MWD) in the Barents Sea. Petroleumstilsynet

Report. Challenges Related to Positional Uncertainty. for Measurement While Drilling (MWD) in the Barents Sea. Petroleumstilsynet Report Challenges Related to Positional Uncertainty for Measurement While Drilling (MWD) in the Barents Sea Petroleumstilsynet 18 DECEMBER, 2017 Challenges Related to Positional Uncertainty for Measurement