Drilling extended reach

These single satellites are commonly used to develop small reservoirs near to a large field. They are also used to provide additional production from, or peripheral water injection support to, a field which could not adequately be covered by drilling extended reach wells from the platform. 

Figure 3.20 Extended reach drilling (BP, Wytch Farm)...

Keywords production decline, economic decline, infill drilling, bypassed oil, attic/cellar oil, production potential, coiled tubing, formation damage, cross-flow, side-track, enhanced oil recovery (EOR), steam injection, in-situ combustion, water alternating gas (WAG), debottlenecking, produced water treatment, well intervention, intermittent production, satellite development, host facility, extended reach development, extended reach drilling. 

A liquid oil, an emulsifier, and a friction modifier, which includes certain polyether compounds, can be added to a drilling fluid consisting of a water-in-oil emulsion formed from a brine [1155]. The friction modifier serves to decrease the coefficient of friction of the well drilling fluid. Decreasing the coefficient of friction lowers the force required to turn the drill bit in the hole. Gravitational forces increase the coefficient of friction in deviated-, horizontal-, and extended-reach wells. 

Hill, T. H., Summers, M. A. Guild G. J. 19%. Designing and qualifying drillstrings for extended-reach drilling, SPE paper number 29349-PA, www.spe.org. 

Directional drilling — Technologies such as steerable downhole motor assembhes and measurement-while-drilling tools allow driUing to occur on the horizontal. The three variations of directional drilhng are extended-reach drilling horizontal drilhng and multiple laterals. 

Cameron C. 2001. Drilling Fluids Design and Management for Extended Reach Drilling. 

Peep well A deep well may be needed to reach groundwater. The range extends, for our purposes, from 25 feet to several hundreds of feet. Wells to several thousands of feet are not uncommon, bnt at the going rate few private individnals conld afford to drill to such depths. 

A small hole, to suit the pilot, is drilled at the centre of the required position. The adjustable arm is extended so that the edge of the highspeed-steel cutting edge produces the required size of hole. This may require a number of trials and adjustments before the correct size is reached. The pilot is located in the pilot hole and, as the tool rotates, it is fed through the work. Fig. 8.17(b). 

The Byrd-Station ice core confirmed and extended conclusions reached previously from the study of the Camp-Century core drilled in northwestern Greenland in 1966 (Dansgaard et al. 1969, 1971 Johnsen et al. 1972 Morner 1972, 1974 Langway et al. 1985). The ice of the Camp-Century core also contains tephra that originated from volcanic eruptions in Iceland (Hammer and Clausen 1981 Hammer 1984). 

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