Goals Field Examples of Fracturing and Drainage by Kurt Rottmann Understand fracture patterns in the Mississippian Review older fracture identification logs Review fracture components to volumetric OOIP calculations Recommendations on mapping the Mississippian Review drainage patterns with possible frac implications Paradoxes to Mississippian Production Why do accumulations of oil and gas appear to follow no distinct law of gravitational separation? Do fracture systems connect the entire Mississippian section to create a common source of supply? Harp (1965) Rottmann 1
Hydrocarbon Separation Paradox as seen in the NE Enid Field Well #1 Well #2 Well #3 #4 IPF High GOR GAS IPF Low GOR IPF High GOR OIL GAS OIL Regional Dip Woodford 35047018220000 BANKERDORF ROY A 1 T22N R6W S1 C NW NW 1,205 352OSGE 6000 2 nd Perf 6150-98 and treated with acid, 6100 Meramec Ip 2,525 mcf/day, and 24 bbls of 54.5 api condensate, 26/64 choke, ftp 1025 psi and gor of 105,000/1 6200 6300 1 st perf- 6350-6464 and treated Ip 160 bbls/day 37.5 api oil, 20/64 choke, ftp 100psi and gor of 532-1 6400 6500 64,740 1,920,429 5/23/1962 Rottmann 2
35003001030001 ENCIE MCCUNE 1 T23N R10W S7 C NE SE H & H SUPPLY COMPANY 359MSSP 6750 1961- Perf 6680-6759 90 bbls/day 38 api oil, 220 Mcf, ftp 100 6875 7000 7125 7250 1964 perf 7200-7280 206 bbls/day 38.2 api oil 68 bbls water 9,868 1,387 4/12/1964 7,500 206 68 60 00 60 00 61 00 6 100 6 200 IPF Low GOR <15,000/1 6 200 6 300 6300 6400 6400 650 0 IPF High GOR >200,000/1 650 0 660 0 660 0 Rottmann 3
49,827 bbls 2,635,250 mcf 40,139 bbls 4,628,594 mcf 7,182 oil 4,794,539 mcf 121,678 bbls 1,633,861 mcf Lease prod 367,931 bbls 1,499,883 mcf Lease prod Rottmann 4
Paradoxes to Mississippian Production Why do accumulations of oil and gas appear to follow no distinct law of gravitational separation? Do fracture systems connect the entire Mississippian section to create a common source of supply? Harp (1965) Top Meramec Top Meramec Top Top Brittle rock Ductile rock Top Woodford Top Woodford Fracture Orientation and Extent Rottmann 5
35047010770000 T23N R5W S21 C SE SW 1,218 359MSSP 35047010800000 T23N R5W S21 C SE SE 1,220 359MPLM 35047211020000 T23N R5W S22 C SE SW 1,214 353MPMC 6000 6000 6000 6100 6100 6100 6200 6200 6200 6300 6300 6300 6400 6400 6400 6500 6500 6500 6600 54,687 575,977 10/17/1963 6600 17,783 200,427 12/30/1963 231,136 4/28/1976 248 1,062 Goals Field Examples of Fracturing and Drainage by Kurt Rottmann Understand fracture patterns in the Mississippian Review older fracture identification logs Review fracture components to volumetric OOIP calculations Recommendations on mapping the Mississippian Review drainage patterns with possible frac implications Rottmann 6
Hilchie, 1982, Fig 16-5, Reprinted by permission of Douglas W. Hilchie, Inc. 35003300750000 MARVEL L RYEL 1 T23N R11W S4 SE NE UNION TEXAS PETROLEUM CORPORATION 359MSSP 6625 6750 6875 7000 Possible Fractures 7125 7250 GR SP Laterolog Caliper Interval 20,679 Transit Time 5/7/1965 7,300 120 200 Delta T Amplitude Amplitude Rottmann 7
35003001500000 T23N R11W S2 C NE SW SHELL OIL CO 359MSSP 06500 6875 6750 6625 7250 7125 7000 7375 GR SP SP Recip Laterolog Short Cond GR Acoustic 1 & 4 Induction Normal3/4/1964 7,425 106 Max Compressional Amplitude Possible Fractures Goals Field Examples of Fracturing and Drainage by Kurt Rottmann Understand fracture patterns in the Mississippian Review older fracture identification logs Review fracture components to volumetric OOIP calculations Recommendations on mapping the Mississippian Review drainage patterns with possible frac implications Rottmann 8
Hilchie, D.W., 1982 Density and neutron logs generally do not see fractures conclusively. The.5 to 1.5 % porosity increase is almost impossible to see on these logs unless the matrix porosity is very low and constant. Once in a while if the formation is badly fractured these logs will show an abnormally high porosity due to the streaming of the gamma rays and neutrons up toe fracture. This streaming phenomena has been noticed in surface test pits. The density log correction curve will sometimes pick up a fracture as an increase in correction. In any of these cases the identification is not conclusive. Volumetric Calculations 2% matrix porosity 30% water saturation 40 foot payzone 40 acre drainage FVF 1.25 4% por w/ frac 30% water saturation 40 foot payzone 40 acre drainage FVF 1.25 OOIP 139,023 BO 10% Rf ~14,000 BO OOIP 278,046 BO 10% Rf ~ 29,000 BO Rottmann 9
Goals Field Examples of Fracturing and Drainage by Kurt Rottmann Understand fracture patterns in the Mississippian Review older fracture identification logs Review fracture components to volumetric OOIP calculations Recommendations on mapping the Mississippian Review drainage patterns with possible frac implications 1962 IP 84 BO & 750 MCFG 1964 IP 81 BO & 652 MCFG 1982 IP 31 BO & 225 MCFG 1984 IP 90 BO & 900 MCFG 1984 1965 Miss cum ~1.5 BCF Proposed Location IP 160 BO & 11397 MCFG 1965 IP 206 BO & 4958 MCFG 1965 Rottmann 10
Gamma Ray Hypothetical Porosity Log Of the Mississippian an Section Porosity Upper Porosity Middle Porosity Lower Porosity Proposed Location Upper Rottmann 11
Proposed Location Middle Proposed Location Lower Rottmann 12
Proposed Location Hypothetical Porosity Log Of the Mississippian an Section Caliper Density Compensation Minimum Gross Porosity Compensated Fractured Cumulative Production 40,000 BO + 1.4 BCFG Mud Cake Rottmann 13
0 0 1.0 0 0 0 1.0 1.0 0 1.0 Rottmann 14
Goals Field Examples of Fracturing and Drainage by Kurt Rottmann Understand fracture patterns in the Mississippian Review older fracture identification logs Review fracture components to volumetric OOIP calculations Recommendations on mapping the Mississippian Review drainage patterns with possible frac implications 1962 IP 84 BO & 750 MCFG 1964 IP 81 BO & 652 MCFG 1982 IP 31 BO & 225 MCFG 1984 IP 90 BO & 900 MCFG 1984 1965 Miss cum ~1.5 BCF Proposed Location IP 160 BO & 11397 MCFG 1965 IP 206 BO & 4958 MCFG 1965 Rottmann 15
Natural Fracture Pattern Proposed Location Rottmann 16
References Harp, L.J., 1965, Mississippian Trend, Garfield, Major and Alfalfa Counties, Oklahoma, The Western Company, Oklahoma City, OK Hilchie, D.W., 1982, Applied Openhole Log Interpretation for Geologists and Engineers, Douglas W. Hilchie, Inc, Golden Colorado, page 16-8 Rottmann 17