C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/51
C02F 1/52 (2006.01) C02F 1/54 (2006.01)
Patent
CA 1076275
Docket No. PC-989 METHOD OF CLARIFYING AND REMOVING WATER FROM WATER-SOLIDS SUSPENSIONS Abstract of the Disclosure A method of clarifying and removing water from water-solids suspensions wherein the solids are formed into flocculent masses and clarified water is continuously removed by the withdrawal thereof through a screen. The present invention relates generally to the clarification and removal of water from water-solids suspensions, and more particularly, but not by way of limitation, to the removal of clarified water from sumps or pits containing spent aqueous drilling fluids and the like. In industry waste aqueous solids suspensions are often produced and accumulated in sumps or pits. For example, in the drilling of oil and gas wells, aqueous drilling fluids are commonly utilized. Such drilling fluids contain both cuttings produced in the drilling of the wellbore which are brought to the surface by the drilling fluid and various fluid loss additives, weighting materials and other additives for controlling the fluid loss characteristics, density and other properties of the drilling fluid during use. Commonly, the drilling fluid is circulated down the wellbore being drilled and back to the surface from where it is routed to a sump or pit which functions as an accumulator as well as a settling basin for the heavier cuttings and other solids which settle by gravitation out of the drilling fluid. At the end of the drilling procedure, the aqueous drilling fluid containing suspended solid materials must be disposed of. With the em- phasis on environmental protection, the disposal of spent drilling fluids and other similar industrial wastes presents a problem. Heretofore, in the disposal of water-solids suspensions contained in sumps or pits, solids flocculating additives have been utilized to form the suspended solids into flocculent masses whereby the masses gravitate to the bottom of the pit allowing clarified water to be removed from the top of the pit. Such methods involve numerous treatment steps and are time consuming and expensive. For example, in treating spent aqueous drilling fluids contained in mud pits, the heretofore used methods involve dispersing a solids flocculating additive into the drilling fluid to form suspended solids into floccu- lent masses, allowing the flocculent masses to settle a short distance and when withdrawing clarified water from the top of the pit. Additional solids flocculating additive is dis- persed in the remaining fluid in the pit and after the flocculent masses formed have again settled a short distance, additional clarified water is withdrawn from the top of the pit. This procedure is repeated until a major portion of the water con- tained in the pit has been clarified and removed, often being incomplete and requiring a long period of time to accomplish, typically a matter of days. -2-
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Totten Patsy L.
Watson Jimmie L.
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