Drilling fluid backflow system for offshore drilling without marine riser
A drilling fluid and riser technology, used in wellbore/well components, earthmoving, wellbore flushing, etc., can solve problems affecting wellbore stability, limitation of pumping capacity, and inability to pump drilling fluid back to the drillship And other issues
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[0071] The present disclosure provides an offshore riserless drilling fluid return system for offshore drilling operations that can return drilling fluid from a wellbore to a drilling platform without using a conventional offshore platform riser. The offshore riserless drilling drilling fluid return system described in this disclosure is not limited by the size of the drilling ship or the water depth capability when performing drilling operations, so relatively small floating drilling platforms (such as drilling ships or other Offshore drilling equipment), greatly improving the economic benefits. The drilling fluid return system for offshore riserless drilling of the present disclosure can be applied to deepwater drilling or ultra-deepwater drilling of underwater substrates or sedimentary formations.
[0072] The drilling fluid return system for offshore riser-free drilling provided by the present disclosure includes: a drilling fluid volume control unit, an open water drillin...
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