European Gas well De-Liquification Conference-2012

Transcription

1 European Gas well De-Liquification Conference-2012 Foam Squeeze and Acid Foam Squeeze - Job Design & Experiences Dr. Nils Recalde Lumm2011 Project participants: Exxon Mobil Dark Mill Fangmann Energy Services Stimulation Department Presenter: Dark Mill (Exxon Mobil) Omair Rauf (Fangmann Energy Services)

2 Outline Fangmann Energy Services 2012 Challenges in wells Foam squeeze job plan Case (Well 3) animation Results & Analysis Conclusion Expertise and Competence in Energy Sector Services

3 Fangmann Energy Services offers Stimulation Cementing Gas Well Deliquification Gas lifting Since 1 st Feb 2012 Down hole tool service Foam Squeeze Foam Acid Squeeze Foam Bactch Foam skids Flowback Services Laboratory Service Fangmann Manpower

4 Fangmann Energy Services in 2012 Projects Enjoyed another succesfull year of foam application: Foam Squeeze Acid Foam Squeeze Foam Batch Treatments Foam Pumping Skids Acid foam squeezing applied for well treatment Stimulation compaign by using environmental friendly, biodegradable fluid for high temperature wells Development of Stimulation Laboratory with state of the art testing equipment Future Projects Foam Squeeze application for offshore wells Application of Mobile Well Flowback equipment with state of the art control & operating system Further application of acid foam squeeze in other wells Application of more environemntal friendly & biodegradable stimulation fluids for Acidizing & Fracturing

5 Location on Map

6 Foam Squeeze-Challenges Challenges Well, Case 1 Poro: 12.3 % BHP: 180 bar Net Thickness: / (TVD md/ TVDSS) Perm: ~15 md Vertical Well Reservoir with strong water drive Well with high water level No production due to high water level Water level up to 1000 m Cap Rock Gas Water

7 Foam Squeeze-Challenges Challenges Well, Case 2 Horizontal fractured well Perm: 10 md BHSIP: 130 bar BHT: 146 C Net Depth (TVDSS): m Porosity: 13.4 % Reservoir with water drive Water accumulation in kick off region Water accumulation causes loss of production Cap Rock Gas Water

8 Foam Squeeze-Challenges Challenges Well, Case 3 Slanted well in Rotliegend formation/havel sand Porosity: 10.7% BHP: 100 bar Net Thickness: 139.8m / 82.9 m (TVD md/tvdss) Perm : ~27 md Unstable sand in the upper region (Sand Production) Frac Packed upper zone Some water production from lower zone causes carbonate scales in the upper zone (fracked liner part) Cap Rock Gas Water

9 Foam Squeeze Plan (Well, Case 1) Job Design (Well, Case 1) Step 1 Water at (60 C) with foam, oxygen scavenger comingled with natural gas to be pumped in the well Step 2 Displacement with Natural gas Step 3 Water at (60 C) with foam, oxygen scavenger comingled with natural gas to be pumped in the well Step 4 Displacement with Natural gas Step 5 Water at (60 C) with foam, oxygen scavenger to be pumped with natural gas Step 6 Displacement with natural gas Step 7 Water at (60 C) with foam, oxygen scavenger with comingled natural gas Step 8 Displacement with natural gas Step 9 Water at (60 C) with foam, oxygen scavenger comingled with natural gas Step 10 Displacement with Natural gas (Overdisplacement foam fluid deep to the formation approx 10 m)

10 Foam Squeeze Plan (Well, Case 2) Job Design (Well, Case 2) Step 1 Water at (50 C) with foam, oxygen scavenger comingled with natural gas pumped in the well Step 2 Displacement with natural gas Step 3 Water at (50 C) with foam, oxygen scavenger comingled with natural gas pumped in the well Step 4 Displacement with natural gas Step 5 Water at (50 C) with foam, oxygen scavenger comingled with natural gas pumped in the well Step 6 Displacement with natural gas Step 7 Water at (50 C) with foam, oxygen scavenger comingled with natural gas pumped in the well Step 8 Water at (50 C) with surfactant, oxygen scavenger comingled with natural gas pumped in the well Step 9 Displacement with natural gas (Overdisplacement foam fluid deep to the fracked area)

11 Foam Squeeze Plan (Well, Case 3) Job Design (well, Case 3) Step 1 Water with foam, oxygen scavenger & scale inhibitor comingled with natural gas pumped in the well Step 2 Water with surfactant, oxygen scavenger & sclae inhibitor comingled with natural gas pumped in the well Step 3 Displacement with natural gas Step 4 HCl, corrosion inhibitor, oxygen scavanger, scale inhibitor and chelating agent with natural gas pumped in the well. Step 5 Water at (50 C) with surfactant and scale inhibitor comingled with natural gas pumped in the well Step 6 Displacement with natural gas STEP 1-3: Foam placement to water zone Lower liner part/ Near wellbore/ Lower perforation zone. To limitize the acid entry to the formation (Unstable sands) Step: 4-5 Acid placement to the carbonate/sand and other depositions mixture in the upper liner part Starting Backflow spent acid and foamed water with sand after 2 hrs (approx )

12 Well 3 Animation

13 Results and Analysis

14 Pressure Results and Analysis Well, Case 1

15 Results and Analysis

16 Pressure Results and Analysis Well, Case 2

17 Results and Analysis

18 Pressure Results and Analysis Well, Case 3

19 Conclusions Foam Applications Foam application scope has been extended, different type of applied jobs are: Foam, water and natural gas Foam, water, scale Inhibitor and natural gas Foam, water, HCl/complexing agent and natural gas Foam Batch (rarely used, mainly where no gas connection is available) Adding (for example) Acid to the treatment allows to cope with many problems in one job with shorter average down time and longer production cycle Foam Acid Squeeze helps to clean the well from acid soluble deposition and also to remove formation damage Job design for foam squeeze or foam acid squeeze needs special considerations according to the well conditions, well parameters, Liquid loading history along with type and magnitude of deposition (Lab analysis and well history) Implementation of environmental friendly and biodegradable acid system for foam squeeze applications Liquid volume recovered during flowback could be up to 300 m³ (Well, Case 1)

20 European Gas well De-Liquification Conference-2012 Foam Squeeze and Acid Foam Squeeze - Job Design & Experiences Thank you for your attention!

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