Lost circulation material

Details Lost circulation material Lost circulation material

1981-09-08

1983-12-27

Guynn, Herbert B.

Compositions

Leather or fur treating

175 72, C09K 702

Patent

active

044229488

ABSTRACT:
A lost circulation material is described wherein a mixture of flexible flakes, fibers and granular particles, preferably shredded paper, mineral wool and calcium carbonate, respectively, which, when maintained in a carrying liquid being circulated through a well during drilling operations, acts to stop the loss of drilling fluid into permeable or fractured formations. The seal on the formation can be degraded by contact with an acidizing acid, such as hydrochloric acid, allowing a potential hydrocarbon producing formation to be reopened for production after a seal has been effected using the material of the invention.

REFERENCES:
patent: 2119829 (1938-06-01), Parsons
patent: 2793995 (1957-05-01), Twining
patent: 2811488 (1957-10-01), Nestle et al.
patent: 3375888 (1968-03-01), Lummus et al.
patent: 3433740 (1969-03-01), Armentrout
patent: 3574099 (1971-03-01), Ryals et al.
patent: 3629102 (1971-12-01), Lummus et al.
patent: 3986964 (1976-10-01), Smithey
patent: 4289632 (1981-09-01), Clear

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