Results 31 to 40 of about 1,204 (263)
Engineering Applications of Computational Fluid Mechanics, 2022 A feature of reverse circulation pneumatic down-the-hole (DTH) hammer drilling system is its ability to reduce the emission of respirable dust which is known to be harmful to drilling workers and equipment.
Xinxin Zhang +5 more
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Role of Reverse Circulation in Exploration Drilling
, 2020 V.M. Sharma, Ken Steele, C.P. Chugh
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Waste and cost reduction using dual wall reverse circulation drilling with multi-level groundwater sampling for contaminant plume delineation [PDF]
, 1995 This paper describes the drilling and sampling methods used to delineate a groundwater contaminant plume at the Paducah Gaseous Diffusion Plant (PGDP) during the Groundwater Monitoring IV characterization.
Smuin, D.R.
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Validation of reverse circulation drilling rig for reconciliation purposes [PDF]
TOS Forum, 2015 Author Summary: Representative samples of ore containing precious metals is a difficult task. The lower the grade and the higher the nugget and/or cluster effect, the more complex and difficult extracting samples that are both accurate and precise. Reconciliation practices can be used as an effective tool to evaluate sampling accuracy throughout grade ...
L.E.C. Pignatari +3 more
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A numerical study of density-unstable reverse circulation displacement for primary cementing [PDF]
, 2022 Primary cementing of the casing string is the operation where the annular space behind the casing is displaced to a cement slurry. Once hardened, the cement should form a solid annular barrier and provide zonal isolation behind the casing.
Kragset, Steinar, Skadsem, Hans Joakim
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IOP Conference Series: Earth and Environmental Science, 2021 Abstract The reverse circulation drilling method is now widely accepted as an effective way of exploration and grade control. However, the performance of reverse circulation drilling operations is greatly affected by the filtration effect (lost circulation) and no research has critically addressed this issue.
Chinedu J. Okere +4 more
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Optimization design of gas sand deflector for reverse circulation drilling
Journal of Physics: Conference Series, 2020 Abstract Gas reverse circulation drilling which has a wide application prospect in complex strata of deep and ultra-deep wells can effectively improve drilling speed, protect the environment, reduce costs, and reduce downhole accidents, but its string structure is different from that of conventional drilling. In this paper, the design of
Biao Liu +6 more
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Calculation of unmitigated release from reverse circulation drilling of a borehole three meters south of borehole 41-15-09 near SST 241-SX-115 [PDF]
, 1999 It is known that underground, single shell tank (SST) 241-SX-115 leaked 50,000 gallons of contaminated liquid to the soil. Now there is a campaign to more fully characterize the plume from that leak. To determine radionuclide concentrations in the vadose
SCOTT, D.L.
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FluidsGas-lift reverse circulation drilling technology is one of the typical “bottom-hole negative pressure” drilling technologies. This technology can significantly reduce wellbore circulation pressure loss, alleviate the bottom-hole pressure holding effect ...
Pu Liu +4 more
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Design optimization of a coal seam annular air reverse circulation bit
Energy Science & Engineering, 2023 Reverse circulation (RC) drilling technology enables the rapid acquisition of coal seam samples, which is crucial in accurately measuring gas content. In addition, the design of the drill bit plays a key role in RC sampling. In this study, the turbulence
Demin Chen +3 more
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