A summary of 'real-time' MWD survey management services for the oil and gas drilling industry including interference detection, corrections, and MWD-based ranging

1. Proximity Drilling Management LLC
Services
July 2016
7/20/2016 PDM LLC

2. PDM LLC
• An independent representative for 3rd party survey management
and relief well services
- GQCSM, MagVar/Surcon
- ABEL Engineering
• ‘Real-time’ MWD survey management
- MI-DAR (Magnetic Interference-Detection and Ranging)
- MI-CORR (Magnetic Interference-Corrections)
• Magnetic ranging operations (‘Passive’, ‘Active’ and ‘Hybrid’ selection
and oversight)
7/20/2016 PDM LLC

3. PDM LLC clients
7/20/2016 PDM LLC
• Do our clients have questions about survey management? YES
• Do our clients have concerns about accurate wellbore placement
overall? YES
• Are our clients concerned about collision avoidance issues in
congested fields? YES
• Should our clients use 3rd party MWD survey QC/QA services? YES
• Do our clients work in old fields with plug and abandonment
problems (surface access, corrosion, stuck fish) ??
• Do our clients require relief well services ??
• Should our clients consider the operational advantages of magnetic
ranging systems with 3rd party QC/QA advisory services? YES

4. PDM LLC Survey Management services overall
Pre-Job
- data base reviews, multi-shot survey review (MSA),
- In-Field Referencing (IFR), well planning, and collision risk support
While Drilling
- single shot corrections, MSA updates, IFR2,
- Interference detection and evaluation,
- MWD-based ranging
Post-Job
- MSA survey management
7/20/2016 PDM LLC

5. Well planning, well-bore positioning, and MWD survey
requirements:
• Well plans must pass anti-collision checks with existing survey data bases
- Anti-collision warnings depend on the accuracy of an Operator’s existing
survey data base
- An MSA review of offset wellbore surveys is needed to ensure overall quality
of anti-collision scans
• ‘Real-time’ anti-collision safety requires MWD survey accuracy and interference
monitoring while drilling
- Offset wellbore detection reduces danger of unplanned close approaches
- MWD-based ranging enables in-hole wellplan corrections
• 3rd party ‘real time’ MWD survey oversight is important for many drilling
programs
- MWD operator’s experience should be considered
7/20/2016 PDM LLC

6. © 2015 Global QC Survey Management LLC.
 Cost effective 3rd party Pre-job survey management
• review of earlier surveys for operational errors
• many examples of poor MWD reporting practicesl
MSA software (SurQC) experience
• Drillstring interference corrections
• SAG and “stretch” corrections
 ‘real-time’ MWD monitoring services
• MSA location updates while-drilling
Global Quality Control Survey
Management

7. © 2015 Global QC Survey Management LLC.
Multi-Station Analysis/Correction
 Done correctly improves MWD azimuth
measurement quality using corrections for
drill-string interference and accelerometer
offsets
 May yield 35% to 44% reduction in EOU
depending on the geomagnetic model and
other factors
 SurQC uses Monte Carlo analysis of raw
sensor data
Multi Station Analysis Correction-Key
Features
Image Source: Tech21

8. © 2015 Global QC Survey Management LLC.
Multi Station Analysis Correction -
improvement in e.o.u. for well planners
Image Source: www.gqcsm.com

9. © 2015 Global QC Survey Management LLC.
Geomagnetic Activity or Offset Wellbore
Interference?
Image Source: www.gqcsm.com
Interference
detection requires
that the 3rd party
MSA engineer is
able to recognize
out-of-designed
values

10. Drilling and rig management
software:
• Slide Reports
• Stockhausen TVD
• Drilling Analytics
• Rig Day/Night
• Rig Summary
7/20/2016 PDM LLC

11. GQCSM summary
• Experienced (from early days) with SurQC MSA software
• Cost-effective services for survey database management
• MSA-based survey monitoring and corrections coordinated with PDM
LLC for unexpected offset wellbore interference effects
• 3rd party IFR2 services
• EDR-based drilling and rig management services
7/20/2016 PDM LLC

12. The geomagnetic reference field
• The Main field (BGGM, IGRF global models)
• IFR (In-Field Referencing)
- HDGM (High Density Geomagnetic Model)
- MagVar (MVSD, MVHD)
• IFR2
- local or locally interpolated (offshore) record of the geomagnetic
field while drilling
7/20/2016 PDM LLC

13. IFR values are the accepted reference for
MWD surveys
7/20/2016 PDM LLC

14. IFR-HDGM and
MagVar
combined satellite and
local aeromagnetic
survey data provide the
‘In-Field Reference’ (IFR)
Integrated with
downward continuation
of surface field to drilling
depths
7/20/2016 PDM LLC

15. © MagVAR 2015
Slide 15
The Global Model Calculator
WMM – main field
IGRF – main field
EMM –main field
MVSD- main field + crustal
HDGM-main field + crustal
MVHD-main field + crustal
MV-IFR- in-field referenced

16. © MagVAR 2015
Slide 16
IFR values are calculated for Each Hole Section

17. © MagVAR 2015
Slide 17
MagVAR and Surcon
- Global magnetic and gravity field models
- Aeromagnetic surveys and local IFR models
- Calculators and software
- Real-time MSA, QC and Anti-Collision monitoring
- MSA & QC post processing (proprietary algorithms)
- Wellbore survey data base audits
http://magvar.com/
http://surcon.co/

18. MagVar/Surcon summary
• Comprehensive IFR services
• Proprietary MSA service (Surcon) used extensively in North American
market
• Interference detection coordinated with PDM LLC
7/20/2016 PDM LLC

19. A quick look at IFR2 and declination
uncertainty
7/20/2016 PDM LLC

20. Geomagnetic Variations add MWD survey uncertainty
• Magnetic north is the reference for MWD surveys. Daily variations
may be outwith MWD system noise
7/20/2016 PDM LLC
typical MWD
sensor noise (50nT)
results in .5 deg
azimuth
uncertainty at high
latitudes (CHF)
where horizontal
field is small
horizontal
magnetic field
variations during a
typical day at
Churchill Falls
(+/-1deg )1 deg
Typical 24hr horizontal
reference field variations at
CHF (Churchhill Falls) and AAE
(Addis Ababa) are shown here

21. ‘real time’ MWD survey management
• The local geomagnetic field is the reference for azimuth calculations
- Not perfectly known! Even with IFR
- ‘Real-time’ changes affect MWD survey accuracy and MSA corrections
- ‘Real-time’ corrections assist following plan accurately and reduce slides
• IFR2
- used primarily high latitudes
- local monitor expense, not practical offshore
• When an MWD survey is ‘bad’ . . .
- observatory check (“poor hand’s IFR2”)
7/20/2016 PDM LLC

22. During drilling operations, PDM LLC
provides
• ‘real-time’ single shot corrections and interference analysis
- experience-based observatory checks and evaluation
• ‘short’ survey corrections (to enable rig time savings)
• ‘real-time’ MWD-based ranging when required
7/20/2016 PDM LLC

23. Real Time Azimuth (RTA) Magnetic
Single Shot Interference Correction
With the MI-CORR report, the
DD forward plan is based on
best possible understanding of
MWD data quality (and
possible problems)
• Eliminate unnecessary corrective
slides for better final wellpath
and rig time savings
• Forward planning to avoid
possible un-planned close
approach to offset wellbores
• Understand the effect of
possible geomagnetic variations
7/20/2016 PDM LLC
Interference (if
present) reported
here for possible
additional shots to
enable MWD-based
ranging
Corrected azimuth
with uncertainty for
any nominal azimuth
and inclination

24. The effect of in-accurate geomagnetic reference values
on a commonly used short-collar correction
• Many service companies use ‘short
collar’ corrections to compensate for
drill-string (axial) interference
• The effect of 100nT/.2dip reference
offset (Reference, IFR1, or IFR2 error)
drilling 82E, 85INC with 500nT DSI
(unknown prior to survey)
• RTA correction is consistently closer to
true hole direction
6/21/2016 PDM LLC

25. During a VERY QUIET geomagnetic field with 100nT,
.2deg dip reference offset, 500nT DSI (unknown)
6/21/2016 PDM LLC

26. A MI-DAR ranging report:
• Geomagnetic activity level
• Data quality
• Target offset
• Tie-on required to match ranging
location with survey location of offset
wellbore
7/20/2016 PDM LLC
Target location (TVD, N,
E ) depends on accuracy
of tie-on location. DD
will use this for forward
planning

27. A Job Summary: ‘real-time’ PDM monitoring through a tight
‘window’
6/21/2016 PDM LLC
Offset survey “adjusted”
from pre-job location to
coincide with MWD-based
ranging at ranging depth

28. ABEL Engineering
Relief well contingency
planning
Relief well operations- well
planning
3rd party magnetic ranging
oversight
Capping System details
available (PDF)6/21/2016 PDM LLC

29. Can Proximity Drilling Management LLC help with
clients needs?
PDM LLC represents:
• Independent 3rd party survey management and multi-station analysis services
- GQCSM(SurQC), Surcon
• MagVar (In-field Magnetic Reference services)
• Scientific Drilling (Precision magnetic ranging services)
• ABEL Engineering (relief well contingency planning, relief well operations, well control)
PDM LLC provides MWD-based ‘real-time’ survey management and ranging
services
• MI-CORR Real-time MWD corrections and geomagnetic analysis
• MI-DAR Magnetic interference estimates (offset wellbore detection, collision avoidance)
• MI-DAR MWD-based ranging services
7/20/2016 PDM LLC

30. Proximity Drilling Management LLC
7/20/2016 PDM LLC