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

2

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

4

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

5

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

6

Case History #1

Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop

Denver, Colorado

7

Case History #1 - Results

Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop

Denver, Colorado

8

Case History #2

Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop

Denver, Colorado

9

•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

10

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

14

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

17

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

18

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

19

Polymer Removal

Feb. 27 - Mar. 2, 20112011 Gas Well Deliquification Workshop

Denver, Colorado

20

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

21

Copyright

Rights to this presentation are owned by the company(ies) and/or author(s) listed on the title page. By submitting this presentation to the Gas Well Deliquification Workshop, they grant to the Workshop, the Artificial Lift Research and Development Council (ALRDC), and the Southwestern Petroleum Short Course (SWPSC), rights to:

– Display the presentation at the Workshop.

– Place it on the www.alrdc.com web site, with access to the site to be as directed by the Workshop Steering Committee.

– Place it on a CD for distribution and/or sale as directed by the Workshop Steering Committee.

Other use of this presentation is prohibited without the expressed written permission of the author(s). The owner company(ies) and/or author(s) may publish this material in other journals or magazines if they refer to the Gas Well Deliquification Workshop where it was first presented.

Feb. 27 - Mar. 2, 2011 2011 Gas Well Deliquification Workshop

Denver, Colorado

22

Disclaimer

The following disclaimer shall be included as the last page of a Technical Presentation or Continuing Education Course. A similar disclaimer is included on the front page of the Gas Well Deliquification Web Site.

The Artificial Lift Research and Development Council and its officers and trustees, and the Gas Well Deliquification Workshop Steering Committee members, and their supporting organizations and companies (here-in-after referred to as the Sponsoring Organizations), and the author(s) of this Technical Presentation or Continuing Education Training Course and their company(ies), provide this presentation and/or training material at the Gas Well Deliquification Workshop "as is" without any warranty of any kind, express or implied, as to the accuracy of the information or the products or services referred to by any presenter (in so far as such warranties may be excluded under any relevant law) and these members and their companies will not be liable for unlawful actions and any losses or damage that may result from use of any presentation as a consequence of any inaccuracies in, or any omission from, the information which therein may be contained.

The views, opinions, and conclusions expressed in these presentations and/or training materials are those of the author and not necessarily those of the Sponsoring Organizations. The author is solely responsible for the content of the materials.

The Sponsoring Organizations cannot and do not warrant the accuracy of these documents beyond the source documents, although we do make every attempt to work from authoritative sources. The Sponsoring Organizations provide these presentations and/or training materials as a service. The Sponsoring Organizations make no representations or warranties, express or implied, with respect to the presentations and/or training materials, or any part thereof, including any warrantees of title, non-infringement of copyright or patent rights of others, merchantability, or fitness or suitability for any purpose.