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The Hunt for Acquisition and Drilling Prospect Leads*
By
Mike Cherry1
Search and Discovery Article #40122 (2004)
*Adapted from oral presentation, entitled “Using Industry Applications Software for Analyzing Data to High Grade Acquisition and Drilling Prospects,” at AAPG Mid-Continent Section Meeting, Tulsa, OK, October 12-14, 2003, and at Tulsa Geological Society Meeting, March 9, 2004.
1CEC Energy Consultants, The Woodlands, Texas (www.CECEnergyconsultants.com) ([email protected])
Abstract
Recent years have seen remarkable technological advances in industry applications software that is capable of analyzing large corporate and/or industry databases, giving geoscientists and engineers the capability of high grading and screening acquisition and drilling prospects.
Using industry applications software, geoscientists and engineers can sort through large datasets to categorize/compile information in order quickly to make generalizations and gain knowledge and background information on a play or trend. This presentation will provide many methods for analyzing data in order to high grade acquisitions, identify field development opportunities, identify areas within a basin that have significant multiple pay zone potential, set up regional or basin-type databases for quick look determinations for auction or acquisition screening and evaluations, and to focus on hot areas of activity.
This presentation will also demonstrate methods of how to use industry software applications and industry data to identify areas of permeability and bypassed productive pay zones that either a geoscientist or engineer could use quickly to sort data and generate acquisition and drilling prospect leads.
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Available Industry Software
Figure Captions (1-6)
Mapping Software Tools (Figures 1, 2, and 3) · Landmark – GeoGraphix (Figure 1) · Geoplus – Petra (Figure 2) · Schlumberger – GeoQuest (Figure 3)
Reserves and Economic Software (Figure 4) · IHS – Power Tools · OGRE Partners –OGRE · Landmark – Aries · Schlumberger – Merak Peep
Automated EUR Reserve Estimates (Figure 5)
Access Database Exports (Figure 6)
Common Uses of Mapping Software· Mapping attribute, net pay, isopach, and structure · Cross sections—stratigraphic and structural · Gridding and contouring techniques · Management presentations · Acreage position management · Field development management · Mainly used by drafting and geo-tech personnel
Common Acquisition Prospect Identification· Contact A&D brokers to see what they represent that is for sale. · Auctions · Make contacts of larger companies that typically sell large volumes of properties and attempt a negotiated purchase.
Common Development Drilling Prospect Identification (Figure 7) · Analyze existing HBP acreage position for infill or extensional opportunities. · Analyze offset operators to HBP acreage position for anomalies or drainage problems. · Identify field extension opportunities. · Analyze existing non-producing acreage position for drilling potential..
Under-Utilized Analytical Functions (Figures 8, 9, 10, 11, 12, 13, and 14)
·
Petrophysical and detailed
·
Volumetric reserve · Identify/compare performance and success · Determine continuity and compartmentalization of reservoirs.
Petrophysical and Detailed
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Figure 16. Database used in computing
cumulative and average production rate: First 24 months of
production of |
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Figure 17. Data statistics, for first 24
months of production for |
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Figure 19. Database with production data
for |
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Figure 20. Image of screen for creating contour grid for the first 24 months of production. |
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Figure 21. Image of screen for creating contour grid for EUR (ultimate gas reserves) |
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Figure 23. Map of cumulative gas production for first 24 months of production (same as Figure 22), showing wells with production ratio of 0.50 to 14.00. |
Pseudo kh Analysis
(Figures 15,
16, 17,
18, 19,
20, 21,
22, and 23)
· Calculate first two years of production.
·
Determine minimum and maximum with statistical analysis
.
· Normalize the data.
· Map it just like you would with kh data.
· Compare it with EUR’s with overlays.
DST
Analysis
as Permeability Indicators (Figures
24, 25,
26, 27,
28, 29, and
30)
· Use to analyze regions or basins for prospect leads.
· Compare areas of high permeability with EUR’s for anomalies.
· Identify areas of high permeability and low EUR’s as indicative of damaged zones.
Figure Captions (24-30)
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Figure 25. Results of DST, from |
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Figure 26. |
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Figure 27. Database of test data, showing variables to extract. |
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Figure 28. Database of test data, with transform equation, Pseudo k = (FFP/FSIP). |
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Figure 29. Map of cumulative gas production for first 24 months of production (same general area as Figure 22), with relatively high-k areas highlighted. |
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Figure 30. Diagram illustrating the technique for determining pressures during DST. |
Basics of DST Testing (Figures 24 and 25)
· ISIP=FSIP, reservoir not depleted or limited
· IHP=FHP and >SIP’s, no significant mud loss and a good test for using data
· Large fluid recoveries = good permeability
Calculating k from DST’s (Figures 26, 27, 28, 29, and 30)
· Calculate ratio of FFP/FSIP.
· Higher ratio is indicative of good k.
· FP/SIP ratios with fluid recoveries – 75% higher than without fluid recovery, indicating higher k.
· High FP/SIP with little or no fluid recovery is indicative of near wellbore damage.
Permeability Indicators
· High k, where FP is closer to SIP
· Low k, where FP is much smaller than SIP
· FSIP<ISIP is indicative of depletion or limited reservoirs.
Darcy Equations
and Productivity
Analysis![Next Hit](/images/arrow_right.gif)
(Figures 31, 32, 33, 34, 35, 36, 37, and 38)
· Calculate which wells should be capable of producing if no damage exists.
· Compare theoretical flow rates with actual flow rates for anomalies.
· Identify wells that can be reworked or redrilled.
Darcy's Radial Flow Equation
Q = (7.08)(kh)(DP) / (Bo )(m)(ln re /rw ), bopd
Q = (0.703)(kh)( DP) / (z)(BHT)( m)(ln re /rw ), mcfd
ln re/rw = 6 to 8; therefore use 7 as a good estimate.
· Calculate Productivity Index (PI) for region or basin.
· Identify areas of high PI potential.
· Compare PI’s with EUR’s for anomalies.
Determine PI (Figures 34, 35, 36, 37, and 38)
· Use Darcy’s Equation to calculate and populate zones for mapping and contouring.
· (Q / DP) = (7.08)(kh) / (Bo)(m)(ln re/rw)
·
Calculate Bcf/1000 psi or Mmbo/1000psi for each well
in
region or basin.
· Identify anomalies for acquisition or drilling prospects.