Petroleo Brasileiro S.a. - Petrobras

Renato S Rodrigues

Jayme H Ogura

Samir P Awad

Andre L Cordeiro

Helio L Falcao

A subsea structure for oil well drilling, completion and production and specially designed for utilization in water depths of 1,000 m or more. The structure includes a template having radially extending structures and which extends radially from a central foundation, on top of which the template shall be set and where a central manifold for controlling the production of wells is located. Each structure arm is provided in its extremity with an opening for adaptation of a guide-base for well drilling, and one of the arms of the template (1) is intended to receive connectors (6) of export and well control lines.

Production system for subsea oil wells

A system for oil well drilling and completing operations in deep water which allows an oil well drilled in deep water to start producing, the operations being conducted from a dynamically placed vessel, comprising: providing a permanent guide base (9) on the sea bottom containing a high pressure housing (13) having an upper free end (15) adapted to receive safety, drilling, and production (completion) equipment, the upper free end of the high pressure housing being covered by a protective cover (17) having an external conical part (18), the permanent guide base (9) also having attached thereto, by means of a releasing device, a releasable guide-funnel (10) which covers and protects the upper free end of the high pressure housing during drilling of the well but which prevents the production equipment from being installed because of its size and shape; withdrawing the releasable guide-funnel, after drilling operations are finished, by means of a remote control vehicle which activates the releasing device, thus leaving the protective cover exposed which, because of its conical part, is capable of performing the same guiding work as the guide-funnel after the guide-funnel has been removed; and lowering a production (completion) base (20) onto the permanent guide base (9) whereby the protective cover protects the upper free end of the high pressure housing from damage during the lowering step.

Equipment for oil well drilling and completing operations in deep water

A process for oil well drilling and completing operations in deep water which allows an oil well drilled in deep water to start producing, the operations being conducted from a dynamically placed vessel, comprising: providing a permanent guide base (9) on the sea bottom containing a high pressure housing (13) having an upper free end (15) adapted to receive safety, drilling, and production (completion) equipment, the upper free end of the high pressure housing being covered by a protective cover (17) having an external conical part (18), the permanent guide base (9) also having attached thereto, by means of a releasing device, a releasable guide-funnel (10) which covers and protects the upper free end of the high pressure housing during drilling of the well but which prevents the production equipment from being installed because of its size and shape; withdrawing the releasable guide-funnel, after drilling operations are finished, by means of a remote control vehicle which activates the releasing device, thus leaving the protective cover exposed which, because of its conical part, is capable of performing the same guiding work as the guide-funnel after the guide-funnel has been removed; and lowering a production (completion) base (20) onto the permanent guide base (9) whereby the protective cover protects the upper free end of the high pressure housing from damage during the lowering step. Equipment for performing the above process is also disclosed.

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Niteroi, Brazil

Renato S Rodrigues