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- W2044978462 abstract "ABSTRACT The Gryphon Field is the first substantial development on the United Kingdom Continental Shelf to reach production where most producing wells are horizontal (Ref. 1). The reservoir is relatively shallow at 5500 ft subsea. Reactive shales and generally weak formations overlay the highly permeable reservoir sands, and both water and gas in the reservoir have high vertical mobility. These combined factors presented challenges for effective completion design. In addition to horizontal wells the development programme included conventional producers, water injectors, an aquifer source well and a gas utility well. The unconsolidated and normally pressured nature of the reservoir dictated sand exclusion design in all wells and artificial lift in the oil producers and aquifer well. Additional requirements for subsea development and easy well interventions led to an innovative subsea tree system (Ref. 2). This paper describes how the above factors were considered in developing the well designs. The necessity for close coordination within the operator's disciplines is illustrated. The overall product is a unique combination of drilling and completion designs which incorporate innovative applications and systems. DRILLING Wellhead Arrangement As shown in Figure 1 the wellhead cluster is positioned 1500m from the Gryphon 'A' production vessel. This proximity created some interference between the Gryphon 'A' anchor-pattern and a standard eight-anchor semi-submersible anchor spread. Two 48 piles were cemented into the seabed with 590 ft of anchor chain buoyed at the free. end. This allows any rig to attach two anchor chains for safe mooring and solves the problem of interference. Setting the piles cost less than adding umbilical and flowline lengths to avoid anchor interference. To set the piles a 36 hole was drilled then opened out to 60 with a specially built hole opener. The piles were run on drill pipe and cemented with a modified grouting slurry. Accurate positioning of the top of cement was achieved using a radioactive densometer. This was recovered on a tugger with an ROV retrieval system as back-up. The wellheads are arranged in a cluster with a 10 metre separation. This arrangement had a lower cost than a conventional template arrangement and reduced the risk of collision between wells while drilling, It does require more accurate rig positioning systems than satellite systems to spud each well. An acoustic transponder array on the seabed positioned the spud assembly with relative measurements accurate to ±0.75 ft. Drilling Hazards From the 15 appraisal wells and 10 geological sidetracks drilled in or around the field a combination of distinct drilling hazards has been identified. These include:Near-surface boulder bedsUnconsolidated sands in surface holeWater-sensitive Eocene claystones above reservoirUnconsolidated reservoir sand with very high permeabilitiesUnpredictable reservoir top and intermittent shales within the reservoir body" @default.
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- W2044978462 date "1994-05-02" @default.
- W2044978462 modified "2023-09-27" @default.
- W2044978462 title "Gryphon Drilling And Completion Design" @default.
- W2044978462 doi "https://doi.org/10.4043/7428-ms" @default.
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