Drilling in the Statfjord Field has become increasingly challenging as remaining oil pockets require designer wells, horizontal wells, or Extended Reach Drilling (ERD) wells with great demand for reservoir navigation in three dimensions. Until recently this has been performed with steerable motor assemblies, with frequent steering difficulties in the reservoir sands. Low rate of penetration (ROP) while sliding has given an overall low drilling efficiency, and in some cases inadequate steering ability has resulted in a less than optimum wellbore placement. Long sliding intervals have also resulted in poor hole cleaning, which has contributed to stuck drill string and lost circulation problems. This paper presents the introduction of a rotary steerable system in the multilateral horizontal well C-23 in the Statfjord Field, and how this improved drilling performance over comparable wells in the reservoir. The following topics are discussed in the paper: Field description and brief overview of directional drilling challenges in the Statfjord Field. Statoil's active role in the development of rotary steerable systems. Functional description of the rotary steerable system, highlighting the technology's benefits compared to traditional directional drilling methods. Why well C-23 was chosen as a suitable candidate for the rotary steerable system, becoming the first successful utilization of this promising technology in the Norwegian Sector. Case history, emphasizing directional control, drilling efficiency improvement, and other valuable experiences from utilizing the rotary steerable system.
Rotary steerable system improves reservoir drilling efficiency and wellbore placement in the Statfjord Field
1998
6 Seiten, 14 Quellen
Conference paper
English
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