[lemma=borehole] [tag=NN | word=□]
[lemma=borehole] [tag=NN | word=to]
The appropriate value is derived from the borehole log , if details are indicated . This information is used to optimize performance and minimize risk by identifying hole cleaning , borehole stability and well control issues , which are easily corrected with surface parameter adjustments . Installation in a deep borehole seems to eliminate the effect of flow noise , but noises characteristic of borehole installation , such as turbulence in the water column of the borehole , might impair the advantage . Within the Ocean Drilling Program ( ODP ) and marine geology and geophysics communities , there has been considerable interest in the past few years in long-term seafloor observatories that include a borehole installation . The model developed will have implications for interpretation of seismic and borehole log data and thus for the development of accurate estimates of the volume of carbon held in the HSZ . Above 0.3 Hz , the seafloor , buried , and borehole spectra at the OSN-1 site show the borehole installation to be 10 dB quieter on vertical components and 30 dB quieter on horizontal components ( Stephen et al ., 1999 ; Collins et al ., 2001 ) . During data transfer , logs are directly imported into the WFLHD computer system and are processed into a final borehole log format . The Purpose for which the Instigator had the borehole drilled should be derived from either the borehole log , or from the report from which the log was copied . The technology is classified as minimally invasive ( the small holes are grouted after measurement ) , and is an efficient , inexpensive alternative to borehole installation . Once this correlation is made , the interpreter has a direct link to the borehole lithology giving rise to the seismic reflections by referring to the wireline logs run in the borehole . In this particular case , where seismic sensors are to be installed as near to the source as possible , borehole installation should give better constraints on hypocenter depths . On some wells , more than 33 % of injection shales were crossed on the horizontal section , affecting borehole stability and impacting well production . The objective was to increase penetration rates , preserve borehole stability , reduce the number of bits and lower overall drilling costs . New data on the stress-dependent anisotropic properties of compacted clay-rich rocks ( i.e ., c11 , c33 , c55 , c66 , c13 or can be used directly to achieve proper focusing in anisotropic imaging and to provide amplitude corrections for AVO and may provide valuable information on overpressure that can be used in borehole stability analysis . There are many situations where lost circulation , well control incidents , and borehole stability problems are directly attributed to tripping the drillstring and other situations where they prevent the drillstring from being tripped . Four years later , in 1931 , the discovery of a “ spontaneous potential ” ( SP ) phenomenon produced naturally between the borehole mud and formation water in permeable beds introduced a new basic measurement — the SP curve .