Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Zero-surface-charge-controlled Drilling for Enhanced Penetration and Extended Bit Life.

Authors
Pahlman-JE; Engelmann-WH; Tuzinski-PA; Watson-PJ
Source
MISSING :18 pages
Link
NIOSHTIC No.
10006816
Abstract
The U.S. Bureau of Mines has continued its investigation of chemical additive drilling fluids that produce a zero surface charge (zsc) on a rock to better define the boundary conditons of the phenomenon. Laboratory drilling tests were performed on Minnesota taconite, Tennessee marble, and Sioux quartzite using diamond-impregnated coring bits or tungsten carbide spade bits. Drilling fluids were made from chemical additives such as inorganic salts, cationic surfactants, cationic polymers, acids, or nonionic polymers in either distilled, deionized water, mine pond water, mine well water, or tap water. These additives were tested below, at, and above their respective zsc concentrations. Penetration and bit life improvements obtained with zsc concentration solutions ranged from 88 and 56 pct, respectively, to over 650 pct and over 400 pct, respectively, for the additives tested. Polyethylene oxide (peo) was found to be the best additive for zsc-controlled drilling because a continuous range of peo solution concentrations produced the enhanced zsc-controlled drilling performance.
Publication Date
19890101
Document Type
IH; Report of Investigations;
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
RI 9227
NIOSH Division
TCRC;
Source Name
MISSING
State
MN; TN;
TOP