bullhead treatment to decrease water production in gas wells · 972 mscf gas, ~400 bwpd 51.2 mscf...
TRANSCRIPT
Gas Well Deliquification Workshop
Sheraton Hotel, Denver, Colorado
February 27 – March 2, 2011
Bullhead Treatment to Decrease Water Production in Gas Wells
Larry Eoff, Mauricio Gutierrez, Carlos Saravia
Halliburton
Feb. 27 - Mar. 2, 2011 2011 Gas Well Deliquification Workshop
Denver, Colorado
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Agenda
• Introduction
– Polymer chemistry
– Laboratory testing
• Case Histories
• Alternate Polymer Usage
Principle of Operation
Pore throat
Water
Hydrocarbon
Feb. 27 - Mar. 2, 2011 2011 Gas Well Deliquification Workshop
Denver, Colorado
Feb. 27 - Mar. 2, 2011 2011 Gas Well Deliquification Workshop
Denver, Colorado
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Lab Results – Brine and Oil Saturated Cores
Lab Results – Brine and Gas Saturated Cores
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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General Candidate Well Criteria
Layered formation, water and hydrocarbon
produced separately
Sandstone or carbonate formation
Bottom hole static temperature (BHST) up to
325°F
Permeability ranging from 0.1 – 6000 md
Economically viable: sufficient remaining
reserves
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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Case History #1
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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Case History #1 - Results
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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Case History #2
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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•The water
production fell from
457 BWPD to 114
BWPD.
•Gas production
increased from
0.386 MMcf/D to
0.484 MMcf/D.
•A 75% reduction in
water production
with a 25% increase in gas production.
1 Year After Treatment
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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Layered formations: highly laminated
sandstones with interspersed coals
and shales.
Most wells have BHST 250 to 370°F
Perforated, and often Fracture
Stimulated
Case History #3
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
Case History #3
• Well struggled to kick off
after shut in
– At risk of not coming back
after shut-ins
• Estimated 1.5 BCF
remaining reserves at risk
972 MSCF Gas, ~400 BWPD
Hydraulic Fracture
51.2 MSCF Gas, 4.7 BWPD
273 MSCF Gas, 237 BWPD
>300 BWPD leaking up
through Cement
plug/retainer and no gas
6219’ – 6254’
6500’ – 6504’6554’ – 6558’
6598’ – 6604’
6724’ – 6758’
6636’ – 6709’
Pre-Treatment PLT Data
Water level at 6630’
Feb. 27 - Mar. 2, 2011
2011 Gas Well Deliquification Workshop
Denver, Colorado
972 MSCF Gas, ~400 BWPD
51.2 MSCF Gas, 4.7 BWPD
273 MSCF Gas, 237 BWPD
Hydraulic Frac
>300 BWPD (no gas)
Treatment Concentration:
BHT = 252 °F
Ave. Perm. In lower
interval ~50 mD (0.1 to
100 mD)
Treatment Volume:
Based on well criteria:
500 bbl treatment
Overdisplace: N2
Limit liquid injection
Reduce cleanup time
Contact matrix gas
Treatment Design
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
Results
• Initial Gas = 0.32 MMscf/D
• Final Gas = 2.23 MMscf/D
• Water Column Dropped 70 feet (below HUD)
• In frac below HUD, water rate cut by ~50%
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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Good Well
Increasing
Water
Production
Decreasing
Gas Production
Post Treatment
Water
Production
Post
Treatment
Gas
Production
Treatment
Case History #4
Feb. 27 - Mar. 2, 2011 2011 Gas Well Deliquification Workshop Denver, Colorado
Case History #4
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop Denver,
Colorado16
Case History #4 Results
• 7 wells treated
• In 6 wells gas rate decline was slowed, in
1 well gas rate increased
• Additional production of ~237,000 Mscf
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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Overall Treatment Results to Date
• Over 400 treatments have been pumped world
wide in both gas and oil wells
• Success rate in gas wells has been ~80%, based
on increase in gas production and/or decrease in
water production
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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Alternate Usage
• This chemistry is also used in other
applications
– Fracturing close to water zones
– Acid diversion
• To date over 2000 jobs have been
performed
Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop
Denver, Colorado
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Polymer Removal
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Denver, Colorado
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Brown sandstone at Sor, 200 ºF (93 ºC), 2000 ppm Polymer, 1 pore volume treatment, followed by 1 pore volume oxidizer
Feb. 27 - Mar. 2, 2011 2011 Gas Well Deliquification Workshop
Denver, Colorado
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Feb. 27 - Mar. 2, 2011 2011 Gas Well Deliquification Workshop
Denver, Colorado
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