US2009200036A1PendingUtilityA1

Method for Subsea Hydrocarbon Recovery

39
Individually held — no corporate assignee on recordPriority: Mar 22, 2006Filed: Mar 22, 2006Published: Aug 13, 2009
Est. expiryMar 22, 2026(expired)· nominal 20-yr term from priority
Inventors:Joop RoodenburgDiederick Bernardus Wijning
E21B 41/08E21B 43/013F16L 1/203B63B 35/03
39
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Claims

Abstract

The invention relates to a method for subsea hydrocarbon recovery in which a wellbore is drilled using a base installed on the seabed, said base comprising a drilling guide, in which at least one pipeline is to be connected to a network for storage and/or processing operations. The method according to the invention includes the following steps: preparing a pre-assembly of a base and one or more pipelines, lowering and positioning the pre-assembly on the seabed, drilling the wellbore through the base, placing a connecting element between the wellbore and the pipeline.

Claims

exact text as granted — not AI-modified
1 . Method for subsea hydrocarbon recovery in which a wellbore is drilled using a base installed on the seabed, said base comprising a drilling guide, in which method at least one pipeline is to be connected to a network for storage and/or processing operations, characterized by the following steps:
 preparing a pre-assembly of a base and one or more pipelines,   lowering and positioning the pre-assembly on the seabed,   drilling the wellbore through the drilling guide of the base,   placing a connecting element between the wellbore and the pipeline.   
   
   
       2 . Method according to  claim 1 , in which an anchor is lowered prior to the pre-assembly to assist the lowering and/or positioning of the pre-assembly. 
   
   
       3 . Method according to  claim 1 , in which the base contains a single drilling guide. 
   
   
       4 . Method according to  claim 1 , wherein the connecting element is placed on the seabed prior to drilling. 
   
   
       5 . Method according to  claim 1 , wherein the connecting element is a christmas tree. 
   
   
       6 . Method according to  claim 1 , in which two or more pipelines connected to a single base are lowered simultaneously from two or more reels. 
   
   
       7 . Method according to  claim 1 , in which after lowering and positioning a first pre-assembly on the seabed, the base of a second pre-assembly is connected to the pipeline of the first pre-assembly. 
   
   
       8 . Pre-assembled base comprising a drilling guide for drilling a wellbore and one or more pipelines to be connected to a network for storage and/or processing operations for subsea hydrocarbon recovery. 
   
   
       9 . Method according to  claim 2 , in which the base contains a single drilling guide. 
   
   
       10 . Method according to  claim 2 , wherein the connecting element is placed on the seabed prior to drilling. 
   
   
       11 . Method according to  claim 3 , wherein the connecting element is placed on the seabed prior to drilling. 
   
   
       12 . Method according to  claim 2 , wherein the connecting element is a christmas tree. 
   
   
       13 . Method according to  claim 3 , wherein the connecting element is a christmas tree. 
   
   
       14 . Method according to  claim 4 , wherein the connecting element is a christmas tree. 
   
   
       15 . Method according to  claim 2 , in which two or more pipelines connected to a single base are lowered simultaneously from two or more reels. 
   
   
       16 . Method according to  claim 3 , in which two or more pipelines connected to a single base are lowered simultaneously from two or more reels. 
   
   
       17 . Method according to  claim 4 , in which two or more pipelines connected to a single base are lowered simultaneously from two or more reels. 
   
   
       18 . Method according to  claim 5  in which two or more pipelines connected to a single base are lowered simultaneously from two or more reels.

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