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- W2003490428 abstract "Abstract In the 10 years plus of horizontal drilling, productivity improvements and cost reductions have been the result of reducing the hole sizes and geosteering the wells within a specific productive horizon. Drilling programs within the Prudhoe Bay unit (PBU) are targeting thin oil intervals sandwiched between overlying gas and underlying water boundaries. Economic constraints related to the high cost of reaching the reservoir have dictated that each well must access multiple targets over longer horizontal segments. Most of these targets are defined by sealing fault boundaries that produce vertical offset ranging from 10 to 70 ft. Considerable precision in vertical wellbore placement is required to evaluate and then redirect true vertical depth (TVD) placement of the borehole with each fault crossing. Failure to rapidly correct for fault offset produces a low-value horizontal hole. The 4 ¾-in. AIM* At-Bit Inclination Measurement tool, developed for use with an advanced triple combo logging system, delivers directional precision previously possible only in larger hole sizes. This system has been used in PBU to drill complex 3D directional wells, land them to within 1 ft TVD of the required target and then to drill for lengths of over 5000 ft with a similar degree of accuracy. The bit rate of penetration (ROP) of the horizontal section has also increased because the amount of slide time required for wellbore placement corrections is reduced by early detection of steering results using the at-bit measurements." @default.
- W2003490428 created "2016-06-24" @default.
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- W2003490428 date "1999-05-26" @default.
- W2003490428 modified "2023-10-18" @default.
- W2003490428 title "Inclination at the Bit Improves Directional Precision for Slimhole Horizontal Wells: Local Case Histories" @default.
- W2003490428 doi "https://doi.org/10.2118/54593-ms" @default.
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