Liquid Soap or Soap Sticks Fall in Gas Wells

Transcription

1 Gas Well De-Liquification Workshop February 28 - March 2, 2005 Liquid Soap or Soap Sticks Fall in Gas Wells Joe Lopez, Eddie Bruner Lynn Rowlan Robert Lestz ChevronTexaco

2 Maintain Gas Production in Loaded Wells Using Liquid Soap or Soap Sticks Two Gas wells Treated With Soap to Remove Liquids and Maintain Gas Production EC Martinez No 4 Liquid Soap used to Treat Well Bruni Mineral Trust C - Well BMT C-35 Soap Sticks used to Treat Well 2

3 Well Information - EC Martinez No 4 Located near Laredo, TX Current Production Rate: 55 Mscf/D Gas (Below Critical Rate) 0.72 BPD Oil 0.62 BPD Water Mono-Bore Production Tubing (No Casing) Multiple Zones Perforated: feet Current Production Method: Soap Treatment 3

4 Production Plot - EC Martinez No 4 Early Loaded 4

5 Chart - EC Martinez No 4 5

6 Procedure to Track Fall of Liquid Soap EC Martinez No 4 Batch Liquid Soap Treatment Applied to Well on 2:42 PM Shot Fluid Levels to Track Liquid Soap Fall Acquired 57 Shots Over an 88 Minute Time Interval Shots Automatically Spaced 1.5 minutes Apart Shots 1-17 Determined Distance to Top of Soap Shots Determined Distance to Soap and Liquid Level at Bottom of Well Bore After Shot 31 Could Not Identify Soap on Acoustic Traces 6

7 Liquid Soap Treatment Acoustic Shots After 7 Min. Top of Soap 42 feet from Surface Soap Fills Tubing While Falling Shot #7 Liquid Soap After 22 Min. Top of Soap 316 feet from Surface Shot #17 Liquid Soap EC Martinez No 4 7

8 Liquid Soap Treatment Acoustic Shots After 23.4 Min. See thru Soap 359 feet from Surface Shot #7 Liquid Soap Shot #18 Soap is Falling as a Tube After 43 Min. Soap Spread over 2344 feet from Surface Liquid Soap Shot #31 LL EC Martinez No 4 8

9 Liquid Soap Treatment Shot Entry Table Shots - #17 to Top of Soap 316 feet #18 to Liquid Level 6353 feet EC Martinez No 4 9

10 Liquid Soap Treatment Time Plots of Shots Casing Pressure Depth to Liquid EC Martinez No 4 10

11 Liquid Soap Treatment - EC Martinez No 4 Shot #18 Shot #31 11

12 Liquid Soap Fall Velocities 100 Ft/Min 18 Ft/Min 54 Ft/Min 12

13 Liquid Soap Treatment - EC Martinez No 4 Batch Liquid Soap Treatment Applied to Well on 05/22/2004 Liquid Fell as a Continuous Slug for 23 Minutes Fall Velocity Averaged 18 Ft/Min for 23 Minutes After 23 Minutes Could See through Liquid Soap to the Liquid Level in Bottom of the Well Liquid Soap Fell as Cylinder from Minutes Fall Velocity Averaged 100 Ft/Min from Minutes Fall Velocity Averaged 54 Ft/Min Over 0-43 Minutes 13

14 Well Info for Bruni Mineral Trust (BMT C-35) Located near Laredo, TX Current Production Rate: 172 Mscf/D Gas (Below Critical Rate) 0.0 BPD Oil 2.0 BPD Water Mono-Bore Production Tubing (No Casing) Zones Perforated: , , , , Tagged Top of Sand Production Method: Soap Sticks 14

15 Soap Stick Treatment - BMT C-35 On 05/23/2004 Dropped 3 Soap Sticks into Well 2:56 PM Shot Fluid Levels to Track Soap Stick Fall Acquired 55 Shots Over an 85 Minute Time Interval First 17 Shots Automatically Spaced 1 minutes Apart Last 38 Shots Automatically Spaced 1.5 Minutes Apart Soap Stick Immediately Stuck at a Depth of 520 Ft Tried to Dislodge Sticks by Blowing Down Casing Pressure and Bringing Well Fluids to Surface 15

16 Soap Stick Acoustic Shots Shot Taken Earlier When Well was Flowing Shot 09:16 AM Liquid Level After 3 Min. Soap Stick 520 feet from Surface Shot 14:57:55 Liquid Level Soap 520 Ft BMT C-35 16

17 Soap Stick Acoustic Shots Liquid in Well Brought to Surface by Dropping Casing Pressure 15:29:12 Liquid 303 Feet Soap Stick 520 Feet Even After Washing with Well Fluids 15:33:39 Soap 520 Ft Liquid 734 Feet BMT C-35 17

18 Soap Stick Acoustic Shots BMT C-35 Liquid in Well Brought to Surface by Dropping Casing Pressure Stuck Soap 520 Casing Pressure Dropped 18

19 Observations Soap Treatments Appear to NOT be Effective Liquid Soap Appeared to not Reach Bottom Liquid Soap Coats the Tubing/Casing Walls Expect Liquid Soap to be Washed Down Flow Line Fell as a Continuous Liquid Slug transitioning to Gaseous Slug transitioning to an Annular Film Coating the Walls Soap Sticks Became Stuck Sticks Did Not Reach Bottom Sharp Edges of Sticks Lodged in Collar Recess? Has your well been filled with Soap? 19