US 9,752,403 B1Granted

Well remediation method and apparatus

OwnerRobert J. Freyinventor

Life of this patent

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Abstract

An apparatus for remediating water wells comprises a plurality of retractable cutting blades suitable for cutting openings in a well casing. The retractable cutting blades and corresponding drive mechanism are organized to be lowered through a well casing. At certain depths, the retractable blades are extended to cut openings in the well casing. The apparatus also includes inflatable retention elements both above and below the retractable blades to create a fluid seal within the well casing. A solidifying, waterproof slurry is injected to flow through the openings via a slurry delivery mechanism, and thereby create a waterproof barrier outside the well casing at the level of a waterproof confining soil layer.

Claims5

Dependent claims

A well servicing apparatus comprising:

a first retractable cutting blade assembly comprising:
a first cutting blade shaft;
one or more first cutting blades connected to the first cutting blade shaft;
a first blade driving element connected to the first cutting blade shaft;
and
a first cutting blade assembly actuator configured to move the one or more first cutting blades to engage an interior surface of a water-well casing;
a second retractable cutting blade assembly comprising:
a second cutting blade shaft;
one or more second cutting blades connected to the second cutting blade shaft;
a second blade driving element connected to the second cutting blade shaft;
and
a second cutting blade assembly actuator configured to move the one or more second cutting blades to engage an interior surface of a water-well casing, wherein
the well servicing apparatus is configured to fit within a water-well casing;
and
the first retractable cutting blade assembly and second retractable cutting blade assembly are linearly offset such that the first cutting blades nest between the second cutting blades when the first cutting blade assembly actuator and second cutting blade assembly actuator are retracted.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/575,324Filed 18 Dec 2014 · us provisional application
Priority: 18 Dec 2013
Granted: 5 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

E21B 29/005
Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe: with a radially-expansible cutter rotating inside the…
E21B 33/1243
Units with longitudinally-spaced plugs for isolating the intermediate space: with inflatable sleeves
E21B 33/127
Packers; Plugs: with inflatable sleeve
E21B 33/138
Methods or devices for cementing, for plugging holes, crevices or the like: plastering the borehole wall; Injecting into the formation

Family

Application61/917,567Us provisional application · filed 18 Dec 2013
US 9,752,403 B1This patent

From the US filing history. Foreign family members aren’t listed.

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