Rheodynamics in Borehole Drilling Technologies

2005 ◽  
Vol 1 (5) ◽  
pp. 77-86
Author(s):  
M. A. Myslyuk ◽  
Keyword(s):  
Borehole Drilling

Electromagnetic Profiling for Groundwater in Precambrian Basement Complex Areas of Nigeria

1990 ◽  
Vol 21 (3) ◽  
pp. 205-216 ◽  
Author(s):  
A. Idowu Olayinka
Keyword(s):  
Water Supply ◽  
Complex Terrain ◽  
High Conductivity ◽  
The Other ◽  
Precambrian Basement ◽  
Basement Complex ◽  
Rural Water Supply ◽  
Well Yield ◽  
Rural Water ◽  
Borehole Drilling

Ground electromagnetic profiling, using a Geonics EM34-3 instrument, has been employed to identify areas of high conductivity in a Precambrian basement complex terrain of Nigeria. Field examples, conducted as part of a rural water supply programme, are presented. They indicate that the apparent conductivities are generally lower than about 60 mmho m−1. Subsequent borehole drilling suggests a good correlation between high EM34 anomalies, deep weathering and high well yield (> 1 1 s−1). On the other hand, boreholes sited on conductivity lows penetrated a thinner regolith with relatively lower yields.

Spontaneous fracture of coal during borehole drilling as an index of burst hazard of the face zone

1977 ◽  
Vol 13 (1) ◽  
pp. 80-82
Author(s):  
I. V. Nedashkovskii ◽  
A. I. Panteleev ◽  
N. I. Voronkov
Keyword(s):  
Face Zone ◽  
Burst Hazard ◽  
Spontaneous Fracture ◽  
The Face ◽  
Borehole Drilling

A Tertiary thrust fault on the southern margin of the Bovey Basin

1971 ◽  
Vol 108 (1) ◽  
pp. 61-67 ◽  
Author(s):  
C. M. Bristow ◽  
D. E. Hughes
Keyword(s):  
Thrust Fault ◽  
Open Pit ◽  
Southern Margin ◽  
Thrust Plane ◽  
Borehole Drilling ◽  
Ball Clay ◽  
The Hill ◽  
Rotational Shear

SummaryGeological investigations and borehole drilling on the southern margin of the Bovey basin around Mainbow ball clay mine and Ringslade open pit have shown that Devonian slate up to 30 m thick is superimposed on Tertiary sediments. A drag fold beneath the slate indicates that the slate has moved eastwards over the Tertiary material. As the slate is relatively intact and not disaggregated, hillcreep cannot be responsible for the superimposition. A large landslip involving a rotational shear cannot be responsible, as the movement plane dips into the hill over too large an area. The southern margin of the Bovey basin is therefore interpreted as a thrust fault of Tertiary age, with thrust plane dipping 10° to 30° S. It is suggested that this is a rejuvenation of the Variscan thrust recognized in the Bickington area and further west in the Holne area and that the movement on the Tertiary thrust is related to the dextral wrench movement on the Sticklepath fault.

scholarly journals Mapping the Viability, Time, and Cost of Manual Borehole Drilling in Developing Regions

Water ◽  
2017 ◽  
Vol 9 (4) ◽  
pp. 262 ◽  
Author(s):  
Pedro Martínez-Santos ◽  
Miguel Martín-Loeches ◽  
Daniel Solera ◽  
Beatriz Cano ◽  
Silvia Díaz-Alcaide
Keyword(s):  
Developing Regions ◽  
Borehole Drilling

GET: A Function for Preferential Site Selection of Additional Borehole Drilling

2004 ◽  
Vol 13 (1-4) ◽  
pp. 139-146 ◽  
Author(s):  
A.A. HASSANIPAK ◽  
M. SHARAFODIN
Keyword(s):  
Site Selection ◽  
Estimation Error ◽  
Central Iran ◽  
Vertical Column ◽  
Preferential Site ◽  
Borehole Drilling ◽  
Average Estimation Error ◽  
Linear Product ◽  
Selection Of

Abstract The essential aims of additional borehole drilling are to improve the reliability of grade and tonnage estimates in each reserve class and to increase ore tonnages. The “GET” function presented in this paper considers strategies for achieving both of these goals simultaneously, and therefore is advantageous for selecting sites for additional boreholes. The “GET” function is either a linear or a non-linear product of three variables G, E, and T: f(G,E,T,) = GαEβTγ where the values of any or all of the exponents α, β, and γ may differ from unity at the discretion of the user. G and E are the average estimated block grade and the average estimation error for ore blocks in one vertical column, and T is the compounded ore thickness within the column. To illustrate its utility, the GET function has been used for determination of the most advantageous sites for additional drilling in the Shah-Kuh Pb-Zn deposit in west central Iran.

scholarly journals Mechanical forcing of water pressure in a hydraulically isolated reach beneath Western Greenland's ablation zone

2016 ◽  
Vol 57 (72) ◽  
pp. 62-70 ◽  
Author(s):  
Toby W. Meierbachtol ◽  
Joel T. Harper ◽  
Neil F. Humphrey ◽  
Patrick J. Wright
Keyword(s):  
Load Transfer ◽  
Water Pressure ◽  
Drainage System ◽  
Hot Water ◽  
Diurnal Changes ◽  
Basal Cavity ◽  
In Situ Investigation ◽  
Borehole Water ◽  
Borehole Drilling ◽  
Thermal Signature

ABSTRACTA suite of surface and basal measurements during and after borehole drilling is used to perform in situ investigation of the local basal drainage system and pressure forcing in western Greenland. Drill and borehole water temperature were monitored during borehole drilling, which was performed with dyed hot water. After drilling, borehole water pressure and basal dye concentration were measured concurrently with positions in a GPS strain diamond at the surface. Water pressure exhibited diurnal changes in antiphase with velocity. Dye monitoring in the borehole revealed stagnant basal water for nearly 2 weeks. The interpretation of initial connection to an isolated basal cavity is corroborated by the thermal signature of borehole water during hot water drilling. Measurement-based estimates of cavity size are on the order of cubic meters, and analysis indicates that small changes in its volume could induce the observed pressure variations. It is found that longitudinal coupling effects are unable to force necessary volume changes at the site. Sliding-driven basal cavity opening and elastic uplift from load transfer are plausible mechanisms controlling pressure variations. Elastic uplift requires forcing from a hydraulically connected reach, which observations suggest must be relatively small and in close proximity to the isolated cavity.

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