Compositions – Leather or fur treating
Patent
1991-05-29
1992-12-15
Stoll, Robert L.
Compositions
Leather or fur treating
252 8555, 252180, 166311, 166312, 507 90, 507128, C02B 506, E21B 4300
Patent
active
051714604
ABSTRACT:
While many materials have been used to inhibit scale formation previously, none have been fully satisfactory to prevent scale formation and precipitation of totally dissolved solids (TDS) in fluids used in well drilling, completion and workovers when the fluids contain divalent metal cations and when the formation contains carbon dioxide. Since many wells are completed into such formations, a continuing search has been directed to an improved method for preventing the formation of such scale. According to the present invention, metal carbonate scale formation and TDS precipitation in a well penetrating a subterranean formation wherein a fluid containing calcium, magnesium, barium or zinc is used in the presence of carbon dioxide is prevented by maintaining the fluid at a pH from about 2 to about 9 and adding from about 1 to about 5000 parts per million of a phosphonomethylated oxyalkyleneamine material having a molecular weight from about 150 to about 3000 to the fluid.
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Atlantic Richfield Company
Sayala C.
Scott F. Lindsey
Stoll Robert L.
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