Controlled directional drilling of boreholes in glacial mass using carrying cable tool

Vasiliev, N. I.; Podoliyk, A.V.; Дмитриев, А. Н.; Bolshunov, A.; Vasiliev, Dmitry

doi:10.1201/9781003014577-31

Cited by 2 publications

(2 citation statements)

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“…When boreholes are drilled in ice, the cable-suspended drill tends to deviate from the vertical if the cutter head is in constant contact with the hole bottom (Vasilev and others, 2014, 2019). For this reason, almost every borehole drilled in ice sheets has an inclination exceeding 1° (Hansen and Kelty, 1994; Jonsen and others, 1994; Augustin and others, 2007).…”

Section: Theorymentioning

confidence: 99%

“…A depth at which the sidetracking should be started was calculated taking into account (a) the request to obtain a full diameter core at a depth of 3311 m at a distance not exceeding 500 mm from the parent hole 5G-1, and (b) the minimum possible angle of the borehole curvature for a given length of the drill (10 m) (Vasilev and others, 2014, 2019). The calculations showed that in order to meet the above conditions, sidetracking had to be initiated at a depth of around 3270 m, i.e.…”

Section: Theorymentioning

confidence: 99%

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Drilling the new 5G-5 branch hole at Vostok Station for collecting a replicate core of old meteoric ice

et al. 2021

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Recent studies have shown that stratigraphically disturbed meteoric ice bedded at Vostok Station between 3318 and 3539 m dates back to 1.2 Ma BP and possibly beyond. As part of the VOICE (Vostok Oldest Ice Challenge) initiative, a new deviation from parent hole 5G-1 was made at depths of 3270–3291 m in the 2018/19 austral season with the aim of obtaining a replicate core of the old ice. Sidetracking was initiated using the standard KEMS-132 electromechanical drill routinely employed for deep ice coring at Vostok, without significant changes to its initial design. Here we describe the method and operating procedures for replicate coring at a targeted depth in an existing slant hole, involving the use of a cable-suspended electromechanical drill. The design of the milling cutter head used for sidetracking is presented. The performance characteristics and the experience of drilling branch-hole 5G-5 at Vostok are described and discussed.

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Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Drilling the new 5G-5 branch hole at Vostok Station for collecting a replicate core of old meteoric ice

et al. 2021

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Drilling of deep and ultra-deep wells for prospecting and exploration of new raw mineral fields

Dvoynikov

Sidorkin

Yurtaev

et al. 2022

PMI

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Scientific and technological progress over the last century has led to an enormous increase in the consumption of minerals, including energy resources. Most of the exploited oil and gas fields are already considerably depleted, so it is necessary to search for new hydrocarbon resources, particularly at great depths. Deep drilling plays a special role in solving this problem. The article considers the world and Russian experience of ultra-deep wells drilling. The me-thods and technologies used in the construction of wells, as well as complications and accidents occurring during their drilling were analyzed. The analysis revealed that the existing limitations for drilling parameters of deep and ultra-deep wells are caused by the technical characteristics of surface and bottomhole drilling equipment, which do not meet the extreme drilling conditions. The directions for development of deep and ultra-deep well drilling machinery and technologies are suggested. The notion of extreme rock and geological drilling conditions is introduced, which describes drilling in conditions of hydrostatic pressure of flushing fluid column and high bottomhole temperature both at stable and unstable wellbore conditions, coming close to the upper limit of operating technical characteristics of bottomhole assembly, the drill string and flushing fluid.

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Controlled directional drilling of boreholes in glacial mass using carrying cable tool

Cited by 2 publications

References 1 publication

Drilling the new 5G-5 branch hole at Vostok Station for collecting a replicate core of old meteoric ice

Drilling the new 5G-5 branch hole at Vostok Station for collecting a replicate core of old meteoric ice

Drilling of deep and ultra-deep wells for prospecting and exploration of new raw mineral fields

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