USGS Series | Water-Resources Investigations Report |
---|---|
Report Number | 84-4176 |
Title | Wireline-rotary air coring of the Bandelier Tuff, Los Alamos, New Mexico |
Edition | - |
Language | ENGLISH |
Author(s) | Teasdale, W. E.; Pemberton, R. R. |
Year | 1984 |
Originating office | |
USGS Library Call Number | (200) WRi no.84-4176 |
Physical description | iii, 9 p. :ill. ;28 cm. |
ISBN |
Download free Lizardtech plug-in now. Plug-in provides searchable text, section 508 compliant accessibility, advanced navigation , and print controls.
This paper describes experiments using wireline-rotary air-coring techniques conducted in the Bandelier Tuff using a modified standard wireline core-barrel system. The modified equipment was used to collect uncontaminated cores of unconsolidated ash and indurated tuff at Los Alamos, New Mexico. Core recovery obtained from the 210-foot deep test hole was about 92 percent. A standard HQ-size, triple-tube wireline core barrel (designed for the passage of liquid drilling fluids) was modified for air coring as follows: (1) Air passages were milled in the latch body part of the head assembly; (2) the inside dimension of the outer core barrel tube was machined and honed to provide greater clearance between the inner and outer barrels; (3) oversized reaming devices were added to the outer core barrel and the coring bit to allow more clearance for air and cuttings return; (4) the eight discharge ports in the coring bit were enlarged. To control airborne-dust pollution, a dust-and-cuttings discharge subassembly, designed and built by project personnel, was used. (USGS)