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Technical Paper: Innovative Drilling Technologies Contribute in Implementing New Gas Lift in Well Design on Statfjord Field, North Sea

Society: SPE
Paper Number: 173954
Presentation Date: 2015
 Download: Innovative Drilling Technologies Contribute in Implementing New Gas Lift in Well Design on Statfjord Field, North Sea (4.07 MB PDF) Login | Register

 

Abstract

Statfjord Field is one of the largest and oldest fields on NCS (North Sea Continental Shelf) and operates with three platforms Statfjord A, B and C. In recent years, slot recovery to drill more wells has posed big challenges to deliver wells with Gas Lift design due to extensive and cost/time consuming P&A and casing cut and pull operations. In addition to these technical challenges, improving operational excellence has driven the concept of innovative casing design with 11 3/4-in liner. This design eliminates the time spend on casing retrieval operations. This reduces time and risks associated with drilling 17 1/2-in section that requires changing from 13 5/8-in to 21 1/4-in BOP, higher flow rates for hole cleaning, larger volume of cutting injection, and waiting 13 3/8-in casing hangers that are crucial long lead items. Installation of 11 3/4-in liner at required depth and cementing, potential collapse of Hordaland formation due to extended time exposure, High flow rates for hole cleaning and minimizing well collision risks with produces in 8 1/2-in were identified as high priority design goals in the early planning phase.

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