{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T00:50:55Z","timestamp":1791939055669,"version":"4.3.4"},"reference-count":3,"publisher":"SPE","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,10,14]]},"abstract":"Abstract<\/jats:title>\n This deepwater operation consisted of executing a sidetrack out of a 14\u2033 116ppf, 0.82\u2033 wall thickness uncemented casing at 46\u00b0 inclination. The scope included setting a hydraulic whipstock between two casing collars using a 9-1\/2\u2033 DP-conveyed casing collar locator on the milling assembly, the first Gulf of America (GoA) run in this tool size, eliminating the need for wireline collar locators and a bridge plug base. A swarf-management program using downhole and surface magnets was implemented to minimize metal cuttings in the fluid system.<\/jats:p>\n A casing scraper \/ clean-out assembly incorporating the DP-conveyed collar locator was initially run to identify preliminary collar locations at the planned whipstock setting depth. The hydraulic whipstock, with an integrated anchor and base, was run to the planned setting depth. At depth, the DP-conveyed collar locator identified casing collars of the 14\u2033 casing, allowing for real-time correlation of the whipstock to the setting depth between the collars. The uncemented casing window at 46\u00b0 inclination was then successfully milled in one run with the tri-mill assembly.<\/jats:p>\n The hydraulic whipstock with integrated anchor was successfully set at the planned inter-collar depth in uncemented 14\u2033 thick-wall casing at 46\u00b0 inclination. The real-time collar locator correlated and placed the whipstock between two casing collars, eliminating any risk of collars parting when milling uncemented casing. The tri-mill assembly, which was also the whipstock assembly, successfully milled the window through the thick-wall casing within 9.5 hrs using pre-engineered milling parameters. Milling operations in the unsupported and uncemented casing were completed without incident, validating the collar placement strategy. This simplified the entire sequence by eliminating a wireline casing collar locator and a wireline-set base for the whipstock. It also removed the operational risk that wireline conveyance could present at high hole angles. This also saved significant time and cost associated with running wireline. Multiple swarf-mitigation measures, including extra string magnets and numerous, strategically placed ditch magnets in the flowlines, helped capture over 5,000 lbs (wet) of metal swarf.<\/jats:p>\n This paper presents in detail the first GoA application of the 9-1\/2\u2033 DP conveyed casing collar locator tool in a highly deviated wellbore, along with the process that led to the successful milling of a thick-wall casing in one run. The approach eliminated wireline runs, reduced rig time and operational risk. The tool's secondary cement evaluation, although not used on this well, provides future utility for casing and cement integrity evaluation. The swarf-management plans effectively mitigated swarf risks associated with the milled metal.<\/jats:p>","DOI":"10.2118\/234032-ms","type":"proceedings-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T00:12:24Z","timestamp":1791936744000},"source":"Crossref","is-referenced-by-count":0,"title":["Operator Experience and Lessons Learned: Deepwater Sidetrack out of 14\" Casing Using a DP-Conveyed Casing Collar Locator"],"prefix":"10.2118","author":[{"given":"N.","family":"Samuel","sequence":"additional","affiliation":[{"name":"Talos Energy LLC"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F.","family":"Amaral","sequence":"additional","affiliation":[{"name":"Wellbore Integrity Solutions"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baker","family":"Hughes","sequence":"additional","affiliation":[{"name":"Wellbore Integrity Solutions"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R.","family":"Janssen","sequence":"additional","affiliation":[{"name":"Wellbore Integrity Solutions"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"861","published-online":{"date-parts":[[2026,10,14]]},"reference":[{"key":"2026101320121555200_R1","doi-asserted-by":"crossref","unstructured":"Dewey, Charles H., and Ronald D.Childers. \"Planning for Successful Window Milling Operation.\" Paper presented at theSPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, September 1998. doi: https:\/\/doi.org\/10.2118\/49255-MS","DOI":"10.2118\/49255-MS"},{"key":"2026101320121555200_R2","doi-asserted-by":"crossref","unstructured":"Hawthorn, Andrew, Steinsiek, Roger, and ShaelaRahman. \"Casing and Cement Evaluation on Drillpipe: New Tool Acquires Well Integrity Data in Parallel with Existing Drillpipe Deployed Operations from Drilling to Plug and Abandonment.\" Paper presented at theOffshore Technology Conference Asia, Virtual and Kuala Lumpur, Malaysia, March 2022. doi: https:\/\/doi.org\/10.4043\/31502-MS","DOI":"10.4043\/31502-MS"},{"key":"2026101320121555200_R3","doi-asserted-by":"crossref","unstructured":"Hawthorn, Andy, Winther, Tonje, Delabroy, Laurent, Steinsiek, Roger, Leslie, Ian, Memiche, Lynda, and AbeVereide. \"Changing the Game: Well Integrity Measurements Acquired on Drillpipe.\" Paper presented at theSPWLA 64th Annual Logging Symposium, Lake Conroe, Texas, USA, June 2023. doi: https:\/\/doi.org\/10.30632\/SPWLA-2023-0117","DOI":"10.30632\/SPWLA-2023-0117"}],"event":{"name":"SPE Annual Technical Conference and Exhibition","location":"Houston, Texas, USA","acronym":"26ATCE","start":{"date-parts":[[2026,10,21]]},"end":{"date-parts":[[2026,10,23]]}},"container-title":["SPE Annual Technical Conference and Exhibition"],"original-title":[],"link":[{"URL":"https:\/\/onepetro.org\/SPEATCE\/proceedings-pdf\/doi\/10.2118\/234032-MS\/5461478\/spe-234032-ms.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/onepetro.org\/SPEATCE\/proceedings-pdf\/doi\/10.2118\/234032-MS\/5461478\/spe-234032-ms.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T00:12:26Z","timestamp":1791936746000},"score":1,"resource":{"primary":{"URL":"https:\/\/onepetro.org\/SPEATCE\/proceedings\/26ATCE\/26ATCE\/D021S015R004\/808896"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,10,14]]},"references-count":3,"URL":"https:\/\/doi.org\/10.2118\/234032-ms","relation":{},"subject":[],"published":{"date-parts":[[2026,10,14]]},"article-number":"D021S015R004"}}