The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1994
Filed:
Nov. 16, 1992
Joseph H Schmidt, Anchorage, AK (US);
Lamar L Gantt, Anchorage, AK (US);
William H Smalstig, Anchorage, AK (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
Perforation tunnels and other voids or spaces in earth formations in communication with wells are sealed more effectively by injecting and pre-packing resin-coated particulates (sand) into such tunnels or voids and allowing the sand to consolidate to form a substantially rigid, permeable mass. A lead slurry of relatively fine grained cement is then injected to fill the interstices formed in the permeable material occupying the tunnels or voids. A larger or more coarse grain cement is then injected to form a substantially impermeable, rigid filter cake at the interface of the wellbore and the permeable mass to prevent loss of cement slurry out of the tunnels or voids before the cement is set. Vertical and deviated or generally horizontal wellbores having perforation tunnels or voids which suffer unwanted cement drainage prior to setting of conventional oil well cements are more effectively sealed by the sequential injection of the permeable material followed by injection of settable cement slurries.