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Instrumented Motors Prove Crucial in Unconventional Well Placement

Authors: Anthony Wright; John Snyder;

Instrumented Motors Prove Crucial in Unconventional Well Placement

Abstract

Abstract Near-bit, instrumented motors are a transformative technology used for unconventional well placement. Near-bit sensors are located closer to the bit compared to traditional measurement while drilling (MWD) sensors, which are normally >20 ft behind the bit, thus allowing the opportunity for exiting thin bed formations before a formation change can be observed on the logs. These tools are also instrumental when choosing the formation tops for each new boundary drilled. The gamma-at-bit-inclination sensor system provides at-bit azimuthal gamma ray and inclination measurements for improved geosteering and optimum well placement. This paper describes the geosteering capabilities of a newly released 6 3/4-in. sensor in different formations. In a single run, the gamma-at-bit-inclination sensor system successfully delivered a hole section of 4,952 ft (2,248 to 7,200 ft) in 43.5 drilling hr, with an average rate of penetration (ROP) of 114 ft/hr in depleted shale and sandstone formations on the Gulf of Mexico (GOM) continental shelf, eliminating additional bottomhole assembly (BHA) changes; a 4,043-ft (7,442 to 11,485 ft) lateral in 23.5 drilling hr with an ROP of 172 ft/hr in Oklahoma City (OKC), Oklahoma; and 4,781 ft (479 to 5,260 ft) in 37.75 drilling hr at an ROP of 127 ft/hr in the Woodford shale of the Mississippi Lime, with zero non-productive time (NPT) or health, safety, and environment (HSE) incidents. The use of near-bit, instrumented motors allows remaining in the zone of unconventional plays longer. To date, a total of more than one million feet has been drilled using a smaller near-bit, 4 3/4-in. instrumented motor, and running with larger-sized tools has proven successful. Instrumented motors previously had limited drilling application; however, with the geosteering requirements for unconventional well placement, a greater range of applications for the measurements provided by the near-bit, instrumented motors has been identified.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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