FIELD: marine oil and gas well drilling equipment, particularly controlling or monitoring drilling fluid pressure or flow.
SUBSTANCE: well drilling system to drill well so that well bottom is located under seabed comprises drilling fluid system to create drilling fluid column over well bottom and system to supply incompressible bodies in drilling fluid column in injection zone. Part of drilling fluid column is limited with riser string, which connects underwater marine well head and surface well section. Injection zone is located in riser string near underwater marine well head. Incompressible bodies have densities lesser that of drilling fluid. System for pressure gradient regulation in drilling fluid column over well bottom comprises pipeline located between surface well section and injection zone and system for suspension injection into pipeline. The suspension contains mixture of incompressible bodies and fluid medium.
EFFECT: increased reliability and efficiency, reduced costs for system construction.
84 cl, 10 dwg
