| Title | Welltec Completion Solutions Metal Expandable Packer and 2nd Stage Cementing for Geothermal Well Re-Lining |
|---|---|
| Authors | K.I. Jamieson, E. Dalland and G.C. Carlos |
| Year | 2020 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | |
| Abstract | EDC (Energy Development Corporation) in the Philippines faced integrity issues in 3 wells due to casing corrosion and collapse with the 9-5/8” and 13-3/8” casing on a geothermal well and was required to re-line with 7” and 9-5/8” casing with a metal expandable packer WAB (Welltec Annular Barrier) to reinstate integrity of the 9-5/8” and 13-3/8” casing. This paper will discuss an operation in which the new 7” and 9-5/8” casing was deployed and set inside 9-5/8” and 13-3/8” casing using an 812WAB and 1214WAB in conjunction with 2nd Stage Cementing Collar. Results, Observations, Conclusions The WAB and 2nd Stage Cementing Port Collar was deployed to setting depth and cementing tool consisting of two cups style packers and an injection port positioned in-between was used for both setting/expanding the WAB. Then, opening the cement collar and performing the cementing operation and subsequently closing the cement collar, all in the same run. The fluid level was below the setting depth, so the equipment was installed in a “dry” well and throughout the operation continuous cooling was performed by pumping water down into the well. By establishing returns to surface after opening the stage collar we were able to get a positive confirmation of the WAB being set, the cementing operation of the annulus was completed in the fully controllable annular volume ensuring 100% cement coverage. As a redundancy in case trapped water should occur, multiple burst discs have been integrated in the WAB to avoid potential casing collapse or deformation. As a result, the client could put the well back on production with full integrity, albeit with a slightly reduced wellbore diameter. Novel/Additive Information Welltec’s WAB metal expandable packer minimizes completion and workover risks through quick and simple isolation of the integrity issues, capable of offering high temperature metal to metal sealing whilst ensuring a life of well product. |