Gas Well De-Liquification WorkshopAdams Mark Hotel, Denver, Colorado

March 5 - 7, 2007

A Novel Foamer for Deliquification of Condensate-Loaded Gas WellsD. Orta, S. Debord, J. Yang, T. SalmaBaker Petrolite

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado2

Outline• Challenges of conventional foamers• Problem solving approach • Screening tests

– Product comparison– Well condensate comparison– Water cut effect

• Trial– Test well information– Gas production results– Condensate production results– Economic gains

• Summary

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado3

Challenges for Conventional Foamers

Typical Unloading Trends forConventional Vs Condenste Foamers

0102030405060708090

0 20 40 60 80 100

Condensate %

Wt%

Unl

oade

d

1% Conv Foamer 2% Conv Foamer 3% Conv Foamer

1% Condensate Foamer 2% Condensate Foamer 3% Condensate Foamer

Challenges

• High condensate cut acts as foam suppressant

• Temperature limitations

• Higher concentration can have adverse impact on downstream processes

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado4

Problem Solving Approach

• Laboratory screening of products in synthetic fluids • Candidate well selection

– Production profile evaluation– Flow modeling– On-site screening with field fluids to evaluate wells

• Initiation of trial• Monitoring of production data• Performance evaluation• Optimization

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado5

Foam Screening Apparatus

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado6

Condensate Foamer Exhibited a Broader Effectiveness Range in Various Condensates

80% Condensate - 1% Various Foamers

0

20

40

60

80

100

Well A Well B Well C Well D Well E Well F

% U

nloa

ded

Condensate foamerAmphoteric foamerAnionic foamer

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado7

Increased Foaming Performance with Condensate Cut

Condensate Cut Effect - 1% Condensate Foamer

0

20

40

60

80

100

0 20 40 60 80 100

% Condensate

Wt %

Unl

oade

d

Well AWell CWell DWell F

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado8

Condensate Foamer trial with Multiphase Separator

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado9

Well was Loaded with 66 Percent Condensate

• Trial performed at a well in Texas• Well depth was 14,700 ft with 3-½ in tubing• Slim-hole completion (no casing)• Applied via cap string through production tubing• Applied in conjunction with intermitter to assist

in unloading fluids• Monitored gas, water, and condensate

production

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado10

$1,894 per Day Net Increase in Gas Revenue

338

589

939

0

100

200

300

400

500

600

700

800

900

1000

Gas

Pro

duct

ion

(Msc

f/d)

Loaded W/ Intermitter W/ Intermitter +Condensate Foamer

Texas Trial - Gas Production Increase

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado11

$782 Additional Revenue from Condensate

Texas Trial - Liquid Production

222.0

296.3

78.0

28.2

0

50

100

150

200

250

300

350

12-Day Production withIntermitter (Baseline)

12-Day Production withCondensate Foamer

Flui

d Pr

oduc

tion

(bbl

s)

Condensate Water

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado12

Economic Impact

• Gas price : $5.41/mBTU (at time of trial)• Crude price: $68/bbl (at time of trial)

Production IncreasesTexas Trial

3186

5080

12582040

0100020003000400050006000

Before After

Rev

enue

($ p

er d

ay)

Gas Condensate

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado13

Trial Summary

• Effectively foamed well with >65 percent condensate cut

• Extended intermittent production from a 1 day “on” to 11 day “on” cycle

• No foaming or emulsion problems observed on surface equipment

• Improved gas production by 59 percent • Improved condensate production by 16 percent

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado14

Acknowledgements

• S. Ramachandran, M. Fosdick, N. Hines• J. Blanchard, J. Long, E. Cantu, J. Garza

Gas Well De-Liquification WorkshopAdams Mark Hotel, Denver, Colorado

March 5 - 7, 2007

Comments & Questions?

Mar. 5 - 7, 2007 2007 Gas Well De-Liquification Workshop Denver, Colorado16

Disclaimer

The Gas Well Deliquification Steering Committee Members, the Supporting Organizations and their companies, the author(s) of this Technical Presentation or Continuing Education Course, and their company(ies), provide this presentation and/or training 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 thatmay result from use of any presentation as a consequence of any inaccuracies in, or any omission from, the information whichtherein may be contained.