| 摘要 |
<p>The invention relates to a process for removing fine solid particulate matter from an oil based used drilling mud and a composition of matter therefor. The process involves mixing of the used drilling mud with a treatment agent containing a mixture of glycol ether and glycol mono-ester. The treatment agent also contains an aqueous bisulfite solution and a pH-modifying substance to adjust the pH level between 8 and 10. To improve viscosity of the mixture, a discrete amount of fresh base fluid is added at a ratio of between 1 to 30 in relation to the used drilling mud being treated. The mixture is exposed to elevated temperatures and then transferred to a separation device, such as a centrifuge, to cause separation of fine solids from the remainder of the mixture. The process can also be employed for a removal of excessive amount of emulsified water from drilling mud base fluid. The treatment agent for the water removal process contains a mixture of glycol ether and glycol mono-ester.</p> |
