
	Where results make sense

Topic: Borehole

In the News (Wed 23 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Borehole Data
		Borehole data are direct measurements of temperature from boreholes drilled into the Earth crust.
		Borehole Data and Climate Reconstructions from University of Michigan's (UM) Global Database
		Pollack and Smerdon 2004 Borehole climate reconstructions: Spatial structure and hemispheric averages
	www.ncdc.noaa.gov /paleo/borehole/index.html (164 words)

	Borehole flow meter - Patent 4566317
		The borehole fluid flow measuring apparatus of claim 1 wherein said detectors comprise light emitting diodes operably disposed so that an optical path between each diode and its corresponding detector is alternatively established and interrupted responsive to the rotation of the disk.
		Borehole fluid may of course travel from the bottom of the hole upwardly for the case of a producing well where fluids are produced from a perforated zone and are flowing upwardly in the well.
		In certain deviated boreholes even though the flow may be primarily in one direction from the bottom to the top of the hole, in certain locations in the hole, say in a lateral portion of it, the flow may be in both directions.
	www.freepatentsonline.com /4566317.html (5702 words)

	borehole
		In the latter case the air is not capable of supporting the borehole walls after drilling and accordingly this type of drill should not be used on sandy formations or in formations where the borehole may collapse after drilling.
		A borehole screen, as the name implies, is a type of strainer which is placed in the water bearing sand in a borehole which allows water to enter the borehole but prevents sand from entering.
		Simplified this entails pumping a borehole and measuring the amount by which the water level drops at varying flow rates and then measuring the time for the water level to recover to it's original depth after pumping is stopped.
	www.southx.co.za /borehole.htm (735 words)

	10.1 General In-Hole Procedures
		Borehole geophysics, as defined here, is the science of recording and analyzing measurements in boreholes or wells, for determining physical and chemical properties of soils and rocks.
		One technique that is available for determining the extent of alteration of rock and fluid properties adjacent to the borehole is the use of different spacing between source and detector in acoustic or nuclear probes or between electrodes in resistivity probes.
		Boreholes that have been carefully cored, where the cores have been analyzed quantitatively, also may be used to calibrate logging probes.
	www.cflhd.gov /agm/geoApplications/BoreholeMethods/101GeneralInHoleProcedures.htm (6479 words)

	Geophysical Borehole Logging
		Geophysical borehole logging involves gradually lowering a probe down a borehole, while the probe measures a physical property of the surrounding rock or soil.
		The array of available probes, designed to measure different properties, enables borehole logging to be used in a wide variety of applications, where boreholes are present.
		Within the normal range of operation of the borehole equipment, the quadrature signal (i.e., the signal 90° out of phase with the primary field) is proportional to the conductivity of the material surrounding the borehole (soil or rock).
	www.nga.com /Geo_ser_Borehole_logging_tech.htm (480 words)

	Borehole Geophysics and Petrophysics - Acoustic logging
		In acoustic logging, a transmitter located in the borehole emits a pulse of mechanical energy which is recorded by one or more receivers located in the borehole some distance away from the transmitter.
		The character of the waveform is determined by the mode content, which depends on such factors as the mechanical properties of the rock around the borehole, the compressional velocity in the borehole fluid, the source frequency and the borehole size.
		Noise that is present at the start of the waveform (caused by vibrations in the probe as it bumps along the borehole) may be strong enough at one or both receivers to cross the threshold.
	gsc.nrcan.gc.ca /borehole/acoustic_e.php (1342 words)

	MALÅ Geoscience - Borehole applications (Site not responding. Last check: )
		Borehole radar is based on the same principles as ground penetrating radar systems for surface use, which means that it consists of a radar transmitter and receiver built into separate probes.
		(omnidiretionally) Borehole radar interpretation is similar to that of surface GPR data with the exception of the space interpretation.
		The standard surface GPR transmitter is positioned at different distances from the borehole on the ground and the borehole receiver probe is lowered into the borehole.
	www.malags.com /applications/borehole.php (1018 words)

	Estimation of borehole geometry parameters and lateral tool displacements patent invention
		The borehole is assumed to be circular and a borehole radius, an eccentering distance (the distance between the circular borehole and the center of the tool), and an azimuth are determined from the ultrasonic standoff measurements.
		Birchak assumes that the borehole is circular and attempts to determine the radius of the circle, the eccentering distance, and an azimuth.
		At intermediate times, the borehole parameter vector may be assumed to remain substantially unchanged and the standoff measurements, azimuth measurements, and the previously determined borehole parameter vector, may be utilized to determine the lateral displacement of the tool in the borehole.
	www.freshpatents.com /Estimation-of-borehole-geometry-parameters-and-lateral-tool-displacements-dt20051222ptan20050283315.php?type=description (6237 words)

	Borehole Detail
		The data collected in a borehole represents a single point in the plan view of a site. Also, the radius of investigation may be small, and not completely representative of the bulk formation.
		The data are acquired by moving a string of instruments up or down the borehole, and measuring the electrical, natural gamma, sonic, electromagnetic, borehole diameter, fluid flow, and temperature responses.
		The caliper log measures the diameter of the borehole, and the fluid flow meter measures the volumetric rate of flow of borehole fluid that moves up or down the borehole.
	www.advancedgeo.com /index_files/boreholelogging.htm (282 words)

	BOREHOLE GEOPHYSICAL METHODS
		The acoustic borehole televiewer log is a magnetically oriented, 360 degree, photograph-like image of the acoustic reflectivity of the borehole wall.
		Deviation of boreholes from the vertical is common, and deviation logs are used to calculate true vertical depth of features of interest and to correct the strike and dip of fractures or bedding obtained from acoustic televiewer logs.
		Heatpulse-flowmeter measurements may be influenced by poor seal integrity between the borehole and the flowmeter or contributions of water from storage within the borehole during pumping.
	pa.water.usgs.gov /malvern/geophysics.html (1016 words)

	6.1.1 Determination of the Depth/Structure/Fracture of Bedrock
		Borehole engineering logging surveys are performed to accurately acquire rock properties, structural stress-strain relationships, fracture statistics, and other in-situ properties for major tunneling and engineering projects.
		The probe is lowered to the bottom of the borehole to verify total depth and then raised slightly to the first measurement point.
		Because boreholes are required, there is the opportunity to obtain more site-specific geotechnical information, which, when integrated with the seismic data, yields the best assessment for the engineering application (liquefaction, deformation, or strong motion Characterization).
	www.cflhd.gov /AGM/engApplications/SubsurfaceChartacter/622BoreholeLogging.htm (2490 words)

	borehole pumps (Site not responding. Last check: )
		Borehole wells are becoming increasingly popular as a clean evironmentally friendly alternative source of water to the ever increasing costs of mains supply water for domestic commercial and industrial installations.
		A borehole is a well usually about 4-6" wide drilled to a depth of around 50-100m, depending on the depth of the water table at the siting of the borehole.
		A test borehole needs to be drilled to establish water quality, the depth of the water surface and the volume of water in the well.
	www.mathews.co.uk /boreholepumps.htm (794 words)

	Borehole Gravity: An Old Technique With New Life? (Site not responding. Last check: )
		Borehole gravity is a density logging method that has been available for over 30 years -- yet today it is a seldom-used technique, even though there are numerous published case studies that demonstrate its value.
		Thus the amplitude and wavelength of the density difference is diagnostic in determining the distance of the remote mass away from the borehole.
		Borehole gravity is not only capable of imaging past a gas cone to determine the true top of the gas-oil contact, but it is also capable of determining the shape of the cone, as these models show.
	www.aapg.org /explorer/geophysical_corner/1999/gpc02.cfm (1030 words)

	Print Borehole (Site not responding. Last check: )
		Borehole mining is used for surface and underground mining.
		With borehole mining, a hole is drilled deep enough into the ground to reach whatever is going to be mined.
		Also, borehole mining works in places that would be very dangerous to mine with other kinds of mining.
	library.thinkquest.org /05aug/00461/boreholeprint.htm (208 words)

	UNAVCO: Plate Boundary Observatory (PBO)
		The borehole is drilled to depths of about 150 m and cased using a steel pipe.
		The cement is forced upwards to fill the gap between the walls of the 8-inch borehole and the 6-inch diameter casing.
		Once the borehole has been cased the bottom of the borehole is cored another 30 to 100 feet.
	pboweb.unavco.org /?pageid=31 (2051 words)

	Borehole breakouts
		Breakouts are zones of failure of the borehole wall which form symmetrically at the azimuth of the least principal horizontal stress [e.g.
		[1997] reports from the KTB borehole that both mechanisms can be identified in rock samples and cuttings: compressive shear failure and extensional splitting of flakes due to the high tangential stress and a lack of ``confining pressure'' from the drill fluid.
		In spite of the still not fully resolved issues of formation and stabilization, it has been found that borehole breakouts in vertical boreholes can reliably be used as indicators of the direction of the least horizontal principal stress [e.g.
	www.geofys.uu.se /bl/Avh/node22.html (834 words)

	borehole resistivity
		Borehole resistivity methods measure the electrical resistivity of the subsurface by lowering a probe down a borehole.
		Borehole resistivity can be used to study lateral changes and vertical cross sections of the natural hydrogeologic setting.
		Borehole resistivity can also be used to study soil and groundwater contamination.
	www.geomodel.com /bhres (180 words)

	WGP - Borehole Video (Site not responding. Last check: )
		borehole video camera was used to investigate the 3-dimensional structure and characteristics of the deforming ice-mass.
		The video camera was lowered through 16 different boreholes giving observation of more than 875 m2 of subglacial ice in the walls of more than 2750 m of borehole.
		View is looking down the borehole, which is at the center of the image.
	research.gg.uwyo.edu /joelh/worth/p/borehole.html (303 words)

	Naeva Geophysics, Inc - Borehole Geophysics
		Borehole geophysics provide a means of evaluating a great variety of physical properties of subsurface rocks, sediments, and fluids.
		Borehole logging offers an economical alternative to continuous sampling or coring, furnishing continuous, objective data sets in a graphical form that can be rapidly interpreted in the field.
		Depth encoded images from the borehole camera are recorded for later review, and provide a permanent record of open borehole conditions, fractures, well screen placement, cracks in casing, etc.
	www.naevageophysics.com /bore.html (456 words)

	CO2 Science (Site not responding. Last check: )
		Similarly, Harris and Chapman (2001) analyzed 439 borehole temperature logs in an effort to determine the temperature history of the mid-latitude sector (30-60°N) of the Northern Hemisphere.
		Whereas most boreholes do not exceed a depth of 1 km, which limits the temporal duration of surface temperature reconstructions by this method to only the past few centuries, Demezhko and Shchapov (2001) studied a borehole extending to more than 5 km depth, which allowed them to reconstruct an 80,000-year history of ground surface temperature.
		(2005) analyzed high-quality borehole temperature data retrieved from four boreholes in quasi-steady state located within a small region in northern Quebec, to ascertain whether records of surface air temperature collected nearby reproduce the subsurface temperature anomalies observed in the area.
	www.co2science.org /scripts/CO2ScienceB2C/subject/b/summaries/boreholes.jsp (1576 words)

	DMT GmbH: Borehole Surveys
		Our geologists and geophysicists carry out borehole surveys using a wide range of intelligent tools, which, if required, can be used in various combinations.
		Borehole surveys are used to determine geological and geotechnical parameters, a knowledge of which is often vital for the later stages of planning.
		Based on the borehole investigations and the interpretation of the data acquired, geological models of deposits for instance can be generated or soil and rock mechanics applications planned.
	www.dmt.de /en/services/exploration_geosurvey/borehole_surveys.html (168 words)

	Borehole Breakouts
		The spalling was observed to occur at diametrically opposed points on the borehole wall perpendicular to the direction of the maximum principal stress.
		The cracks are densely spaced and subparallel both to the borehole wall and the maximum horizontal stress direction.
		Cracks initiates at the borehole wall, were intergranular and propagated along a pth of high shear stress.
	www.hydrofrac.com /hfb_home.html (545 words)

	VECTOR Borehole Specs
		Mud-rotary units have been used, however, the last 10 feet of the borehole must be drilled in the absence of drilling muds to assure the absence of pore-clogging muds within the borehole.
		How the borehole is completed will also depend on local regulations as well as what contaminants are to be expected.
		Where a collapsing borehole is not likely, the installation may be backfilled with a clean, sorted sand of appropriate sieve size.
	hydrotechnics.com /boreholespecs.htm (324 words)

	Borehole Logs
		Borehole logs are used to display the results of oil and gas, mining, geotechnical and environmental drilling and sampling.
		Borehole logs are grouped into projects and are stored in the WinLoG project database.
		In general, all of the boreholes in a project would use one or two templates to format the logs.
	www.gaea.ca /OnlineHelp/winlog/356.htm (249 words)

	Borehole Electromagnetics (Site not responding. Last check: )
		The problem is that the traditional inversion methods use the smooth models of the conductivity distribution along the borehole to provide a stable and reliable solution.
		The deviated borehole line is tilted at the constant dip angle of 30 degrees with respect to the vertical axes.
		The conventional induction logging instrument (with the transmitter and receiver oriented along the borehole) usually provides an image of the resistivity distribution that is axially symmetrical with respect to the borehole axis.
	www.mines.utah.edu /~wmcemi/appls/bhole/index.html (1784 words)

	SAIC: Geophysics: Borehole Methods
		The caliper log is used to measure the overall diameter of the borehole to identify washed-out zones or fractures.
		Measuring the deviation of a borehole is performed using a sonde with three axis magnetometers and accelerometers.
		Knowing borehole deviation is a requirement to correct for interpreted bedrock strike and dip in televiewer logs.
	www.saic.com /geophysics/borehole-methods.html (815 words)

	Mini-PBO Borehole Adapter for GPS
		The borehole adapter accommodates access to the top of the borehole for maintenance of the down hole instrumentation and can be repositioned with a high level of accuracy both in the vertical and horizontal axes using a force-centering system that ensures correct azimuthal alignment.
		This first borehole adapter would not be acceptable should it have to be removed to access to the borehole.
		In this case, signal scattering should not be factor due to a vertical metal shroud used to surround the perimeter of the borehole adapter between the borehole adapter and the antenna base.
	www.ncedc.org /bard/boreadapter (1209 words)

	Borehole Geophysical Logging (Site not responding. Last check: )
		A variety of borehole geophysical logging techniques are being used to characterize aquifers and monitor contaminant plumes in the United States.
		In this case borehole fluid conductivity logs, taken after the fluid in the borehole was replaced by deionized water, were used to confirm the locations of water-producing zones in the borehole, and provide water-quality parameters for correlating flow between the 5 boreholes and estimating inflow from the overlying saturated surficial deposits.
		To extend the scale of this study away from the 6 logged boreholes, many observation wells were used both to define flow domains within the aquifer by mapping the water-level elevation and to define preferred flow directions through aquifer drawdown tests.
	www.agu.org /revgeophys/phillj01/node14.html (315 words)

Try your search on: Qwika (all wikis)