Method of using a reactive iron oxide drilling mud additive

Details Method of using a reactive iron oxide drilling mud additive Method of using a reactive iron oxide drilling mud additive

1980-09-08

1982-04-13

Thomas, Earl C.

Boring or penetrating the earth

Processes

Chemical reaction with earth formation or drilling fluid...

175 66, 423225, 423231, 252 855B, 252 855E, C09K 704, B01D 5334

Patent

active

043242987

ABSTRACT:
Iron oxide particles having a high surface area, a high kinetic K value and composed substantially of amorphous Fe.sub.2 O.sub.3 and crystalline Fe.sub.2 O.sub.3 are drilling mud additives suitable for scavenging hydrogen sulfide. Such particles do not adversely affect the rheological properties of the mud and when reacted with hydrogen sulfide form reaction products which are acid stable. Upon completion of drilling, the drilling mud containing these iron oxide particles and their reaction products with H.sub.2 S may be left in place between the inner casing and the formation wall or the outer casing as a packer fluid.

REFERENCES:
patent: 4008775 (1977-02-01), Fox
patent: 4246244 (1981-01-01), Fox

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