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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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slide1

Pioneer Natural Resources

Monitoring the Movement of CO2 at the Upper Spraberry Reservoir Using Well Logs

Texas A&M University

Gokul Lakshman

slide2

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
slide3

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

slide4

Pilot Design

N

Producers

CO2 Injectors

Observation

wells

Water Injectors

slide5

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
slide7

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

slide8

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
slide9

Enter Tool Physics

CNL TOOL

SS

LS

LSD

Gamma Rays

Formation

SSD

H+

SOURCE

Thermalized neutrons

slide10

Logging Runs Conducted

Total HCPV to be injected : 22HCPV(128MMCF)

How much has been injected until now:76MMSCF

Feb 22nd Start of CO2 Injection

slide11

What the logs have to say ?

Successive Neutron porosity decrease observed-Jan to Dec Well 49

1u

2u

3u

Gas entry

4u

5u

slide12

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

slide14

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

slide17

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