| 摘要 |
The present invention comprises the use of hexamethylene diamine (HMDA) and its salts formed with organic or inorganic acids as an inhibitor for shales and clay found in drilling and producing petroleum oil and gas wells. When HMDA is added to the aqueous base of a drilling fluid, the resultant mixture inhibits shale and clays to impart and/or increase permanent permeability stability in reservoirs. Thus, with the use of the present invention, a more environmentally acceptable, chloride free, water base drilling fluid may be used in place of an oil base drilling fluid, or fluid with the heretofor more commonly used potassium additives. The present invention may be used as a completion fluid, and as a drill-in fluid. |
