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Monitoring the Movement of CO 2 at the Upper Spraberry Reservoir Using Well Logs

Pioneer Natural Resources. Monitoring the Movement of CO 2 at the Upper Spraberry Reservoir Using Well Logs. Texas A&M University. Gokul Lakshman. Outline. Pilot Information Location Pilot Design Pilot Highlights Upper Spraberry Makeup CO 2 Flood Mechanism Log Monitoring

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Monitoring the Movement of CO 2 at the Upper Spraberry Reservoir Using Well Logs

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  1. Pioneer Natural Resources Monitoring the Movement of CO2 at the Upper Spraberry Reservoir Using Well Logs Texas A&M University Gokul Lakshman

  2. Outline • Pilot Information • Location • Pilot Design • Pilot Highlights • Upper Spraberry Makeup • CO2 Flood Mechanism • Log Monitoring • Objectives and Tools Used • Looking Inside CNL tool • What the logs have to say? • Decision Analysis • Production Outlook • Conclusions and Future Scope

  3. Location O’Daniel Martin Co Canyon Reef Carriers CO2 Supply Shackelford Midland Co Glasscock Co Preston Driver Midkiff Tippett NorthPembrook Merchant Sherrod Pembrook Aldwell Upton Co Reagan Co Benedum

  4. Pilot Design N Producers CO2 Injectors Observation wells Water Injectors

  5. Pilot Goal • To evaluate the technical and economical feasibility of using • CO2 as a tertiary recovery agent in the low permeability, fractured sandstone of the Spraberry Trend • Pilot Objectives • Collection and Analysis of pilot performance data • To understand vertical and horizontal heterogeneities • To determine optimal usage of CO2 • Comparison of waterflood and CO2 flood performance • Work within the limitations of allocated budget

  6. Spraberry Reservoir : Looks Complicated??

  7. CO2 Flood Mechanism CO2 7045 1550 PSI 1U CO2 HEAVIER FRACTIONS CO2+OIL OIL 2U • Key Operating Targets • CO2 Injection Rate= 91MSCF/D • Average Reservoir Pressure= 2300PSI • Target Water Injection Rate= 250BPD 3U 4U PAY ZONES 5U 7230

  8. Log Monitoring of CO2 flood – A Forensic science Objectives • Monitoring the movement of CO2 in the formation • Calculation of the saturation of fluids Logging Tools Used • Compensated Neutron Log • Array Induction Log

  9. Enter Tool Physics CNL TOOL SS LS  LSD Gamma Rays Formation SSD H+ SOURCE Thermalized neutrons

  10. Logging Runs Conducted Total HCPV to be injected : 22HCPV(128MMCF) How much has been injected until now:76MMSCF Feb 22nd Start of CO2 Injection

  11. What the logs have to say ? Successive Neutron porosity decrease observed-Jan to Dec Well 49 1u 2u 3u Gas entry 4u 5u

  12. Jan-Mar Distribution 1u 25 20 15 10 5 0 0.025-0.038 1u Frequency Distributions in Well #49 100 90 1 80 70 60 Cumulative frequency Relative frequency 2 50 40 30 20 10 0 0.038-0.050 0.050-0.063 0.063-0.075 0.075-0.088 0.088-0.100 0.100-0.113 0.113-0.125 0.125-0.138 0.138-0.150 0.150-0.163 0.163-0.175 0.175-0.188 0.188-0.200 0.200-0.213 0.213-0.225 Neutron Porosity Distribution Jan rel freq Mar rel freq jan cum freq mar cum freq

  13. 5u Frequency Distributions in Well #49

  14. Decision Analysis--Lets be practical? Oil in tank-Is it significant?? Whether a nominal PV of CO2 has been injected ? Have Log So Responses Been Stabilized Cease CO2 Injection

  15. Production Outlook -Cumulative CO2 Injection

  16. Are we still getting enough oil in the tank??

  17. Conclusions • From neutron porosity logs there is indication of gas movement in all layers • More Logging runs required to get a clear picture of CO2 movement • My present status of research • Trying to calculate Sg using count rates • Awaiting more data from field • What I plan to achieve? • Calculate Sg for all layers • Compute extent of vertical displacement of CO2 using log analysis • Predict the horizontal movement of CO2 using tracers and gas • compositions at different wells

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