The utility model discloses an automatic throttling monitoring manifold for large-drift-
diameter well drilling, which comprises an inlet four-way joint, a first
pressure control throttling pipeline, a second
pressure control throttling pipeline, a third blowout pipeline and a fourth monitoring pipeline, and one interface of the inlet four-way joint is connected with
wellhead equipment; the other three interfaces are respectively connected with a first
pressure control throttling pipeline, a second pressure control throttling pipeline and a third blowout pipeline; the first pressure control throttling pipeline and the second pressure control throttling pipeline have the same
structural composition and are standby for each other; the third blowout pipeline is provided with a special-shaped five-way connector, and the other three connectors of the special-shaped five-way connector are connected with the
tail end of the first pressure control throttling pipeline, the
tail end of the second pressure control throttling pipeline and the initial end of the fourth monitoring pipeline correspondingly. According to the 5 ''* 35MPa large-drift-
diameter automatic throttling monitoring manifold suitable for large-displacement operation of the ultra-deep well, fluid with larger displacement can pass through, circulating friction resistance is reduced, and
wellhead pressure is reduced, so that the service life is prolonged, and potential safety hazards are reduced.