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In a well drilling system a fire suppression apparatus includes a pressure rated bell nipple or enclosure member mounted on the blowout preventer and including an elongated central passage opening at one end to an enlarged bore portion adjacent a restabbing flange. Diametrically opposed convergent n

In a well drilling system a fire suppression apparatus includes a pressure rated bell nipple or enclosure member mounted on the blowout preventer and including an elongated central passage opening at one end to an enlarged bore portion adjacent a restabbing flange. Diametrically opposed convergent nozzles open into the enlarged bore portion and are connected to a source of pressure water and/or a source of pressure fire extinguishing fluid by way of a manifold and respective remotely controllable shut off valves and check valves. The enclosure replaces a conventional bell nipple and provides an added measure of fire suppression protection in the event of uncontrolled flow of well fluids from the well. Branch conduit sections are connected to the main conduit section of the enclosure to provide a cuttings evacuation fluid flow line and a fill up or well fluid diversion line.

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[ What is claimed is:] [1.] In a system for drilling a well including an elongated drill stem extendable into a wellbore penetrating an earth formation and a wellhead operably connected to said wellbore for receiving said drill stem extending therethrough and including means forming a circulation pa

[ What is claimed is:] [1.] In a system for drilling a well including an elongated drill stem extendable into a wellbore penetrating an earth formation and a wellhead operably connected to said wellbore for receiving said drill stem extending therethrough and including means forming a circulation path for drill cuttings evacuation fluid circulated through said drill stem and through an annulus of said wellbore, the improvement characterized by:an enclosure member supported on said wellhead and disposed in said circulation path and including a conduit section forming a first passage, a branch conduit section intersecting said main conduit section and forming a second passage for conducting cuttings laden evacuation fluid away from said first passage and an enlarged bore portion of said first passage extending generally above said branch conduit section;plural nozzles on said enclosure member and opening into said enlarged bore portion of said first passage, said nozzles being inclined in a direction toward well structure disposed adjacent said enclosure member and in a direction of flow of cuttings evacuation fluid and wellbore fluids through said enclosure member in the event of uncontrolled flow of fluids from said wellbore;conduit means connected to each of said nozzles; anda source of fire extinguishing fluid operably connected to said conduit means for discharging fire extinguishing fluid into the flowpath of well fluids flowing through said enclosure member to suppress combustion of said well fluids.