簡介：油服巨頭威德福公司和意大利埃尼目前聯合開發海底套管鉆井系統（DwC）。該系統名為SeaLance， 據稱該系統適用于鹽性油藏，并能和市場上的高壓井頭護罩聯合使用。

Oilfield services giant Weatherford and Italian energy company Eni are joining forces to develop a subsea drilling-with-casing (DwC) system. The system known as the SeaLance will reportedly further advances in subsalt plays and will be capable of working with any high-pressure wellhead housing on the market.

Weatherford’s DwC systems have been available for several years as a solution to drilling hazards that arise as reservoirs age, such as depleted zones with pressure transitions and hole stability problems. A DwC system removes the need to trip pipe and bottomhole assemblies, and additionally simplifies well architecture by potentially reducing the size of surface casings and liners. In some cases, it is possible to eliminate a casing string or liner altogether by successfully drilling into or through a pressure-transition or lost zone, according to Weatherford.

The result is a solution which speeds up the drilling process and reduces risk exposure by always having casing on or near the bottom.

The SeaLance system will be designed to enable a 20-in. casing string and its high-pressure wellhead housing to be drilled to a predetermined depth, cemented in place, and released in one trip?regardless of which wellhead housing is being employed on the project. The system will ultimately allow the remaining casing seats to be pushed deeper into the wellbore, and will further enable applications in subsalt plays.

Eni awarded Weatherford an Innovative Technology Agreement to develop the SeaLance. This technology agreement is reportedly aimed at realizing the benefits that a technology such as the DwC system can offer?including mitigating shallow hazards?in a previously nonapplicable and costly subsea environment. In doing so, this system will minimize risk while allowing maximum flow area to be maintained.

More information on DwC systems can be found at Weatherford’s site.

楊寶劍 是振威（全球）石油網的高級技術編輯，在石油技術資訊行業有八年的學識和經驗。他源源不斷地提供石油行業全球最新的技術創新、研發成果、現場應用情況等信息。如果你對該項新技術有任何的疑問，或者對“新技術新產品”未來的內容有任何問題或建議，請聯系楊寶劍編輯 +86 10-58236512 Email：[email protected] 歡迎與行業互動！