This invention discloses a low-profile, dual-stage sealing rotary
blowout preventer (BOP), solving the problems of existing rotary BOPs being large, tall, and complex in structure, resulting in high
wellhead height, inconvenient maintenance, and requiring a remote
hydraulic control station for
lubrication, cooling, and pressure balancing, leading to high size and cost. The rotary BOP of this invention includes a housing
assembly, a rotating body, a drive gland, a drive sleeve, an upper rubber sleeve, an annular pressure ring, a lower rubber sleeve, a clamping device, and a drive compensation core. This invention places both the upper and lower rubber sleeves within the rotating body, fully utilizing the space of the rotating body and reducing the height of the rotary BOP by half. This allows for a wider range of applicable drilling platforms and facilitates maintenance. Simultaneously, a threaded connection structure is used, injecting high-temperature resistant
grease into the mounting chamber of the first bearing through a
grease injection hole to achieve
lubrication and cooling of the first bearing. This ensures that the
lubrication and cooling of the rotary BOP does not require any external
control unit, resulting in a simple structure, convenient operation, and low cost.