ExpertsThe general expandable casing guidelines call for TOC to be less than 75% of the post expansion annular length. I had a meeting with Enventure and they indicated that if the casing 1000 feet (300m) of open hole operators have been using 100% of that post-expansion volume.Does anyone have any experience with using volumes greater than 75% of the post expansion annular length? If yes, do you have any lesson learned or best practices that you could share me?Michael AwaltBlack Sea Cementing Project Manager SchlumbergerCell: +90 533 216 6783Office: +90 312 466 7740 (switchboard)email: mawalt@slb.com

Michael,I was going to do 7 5/8 x 9 5/8 SET contingency liner cementing job last month, but fortunately or unfortunately, the job was canceled at last minute.Since Enventure doesnt want large size cutting disturb SET expansion in overlap section, they advised to pump either- Option1 : only small volume around shoe- Option2 : pump more than OH volume to make sure TOC goes above liner overlapIn our case, OH was +- 800m & there was loss circulation while drilling 8 1/2 x 9 1/2 OH. Thus, we chose Option1 (400m column after expansion, +- 25 bbl 15.8ppg slurry)Im not sure what is your SET size, but SET length is relatively short, maybe it makes a sense to pump more volume???I havent done any SET job w/ 100% volume, so Im not really answering your question. I hope you get appropriate feedback from other location.Regards,

MichaelWe ran an expandable Hydra-Skin (Weatherford) liner in Algeria to cover an unexpected high pressure zone.One of the concerns was the seal on the elastomer elements on the expandable liner hanger system. Elastomers on the expandable top (overlap of 9 5/8 casing) were the sealing mechanism on the top of expandable liner.In our case no excess was pumped at all; 6 arm caliper log was run to know the hole volume for the slurry volume, 100% of the annular volume (post expansion) was pumped. All the dimensions pre and post expansion should be provided by Enventure. If there is no seal element you can go with a TOC above of the TOL.The risk was to damage the seal elements (elastomers) with the slurry.If you need more details on this success job, please let me know.RegardsMauricio

Michael,As such system do not have liner hanger but the top liner joint has 5 elastomer seals which serve as liner hanger and seal assembly, after the expansion is completed. Cement slurry in this section could affect the sealing ability of elastomer seals with the previous casing. So to get this done successfully in safer way, Enventure or even other companies do not recommend any cement slurry in this section. Their recommendations are, post expansion slurry volume of open hole section only and even do not consider over lap volume. Same as in your case.Best regardsShahid