MUD LIFT DRILLING SYSTEM USING EJECTOR ASSEMBLY IN MUD RETURN LINE |
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| 申请号 | US15552302 | 申请日 | 2015-05-14 | 公开(公告)号 | US20180073314A1 | 公开(公告)日 | 2018-03-15 |
| 申请人 | Donald G. Reitsma; Iona M. Reitsma; | 发明人 | Donald G. Reitsma; Iona M. Reitsma; | ||||
| 摘要 | A method is described for controlling pressure in a wellbore drilled below the bottom of a body of water wherein the wellbore has a fluid outlet in communication with a working fluid inlet of an ejector assembly to return drilling fluid to a drilling platform on the water surface. The method includes pumping drilling fluid into a drill string extending from the drilling platform into the wellbore and at least one of, (i) introducing fluid into a power fluid inlet of the ejector assembly at a rate selected to remove fluid from the wellbore fluid outlet at a selected rate and (ii) operating a controllable flow restriction in a flow path from the wellbore fluid outlet to the working fluid inlet of the ejector assembly, in order to maintain a selected wellbore pressure. | ||||||
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