A method for operation in wellbore, the method comprises: pumping a fluid barrier into a wellbore through a tubular, the fluid barrier being operable to separate a cement slurry from a second fluid; the fluid barrier comprising a polyurethane member derived from a polyurethane forming composition comprising a para-phenylene diisocyanate terminated polycarbonate prepolymer and an aromatic diol.

A first expandable tubular is longitudinally extendable from a housing. The first expandable tubular is expandable to a diameter equal to an internal surface of a wellbore. A first expander is configured to expand the expandable tubular. A second expandable tubular is longitudinally extendable from the housing. The second expandable tubular is configured to expand to a diameter equal to an internal surface of the wellbore. The second expandable tubular is downhole of the first expandable tubular. A second expander is configured to expand the second expandable tubular. The second expander is downhole of the first expander. A sensor is downhole of the second expander. The sensor is configured to detect a presence of a wellbore obstruction proximal to the tool.

A first expandable tubular is longitudinally extendable from a housing. The first expandable tubular is expandable to a diameter equal to an internal surface of a wellbore. A first expander is configured to expand the expandable tubular. A second expandable tubular is longitudinally extendable from the housing. The second expandable tubular is configured to expand to a diameter equal to an internal surface of the wellbore. The second expandable tubular is downhole of the first expandable tubular. A second expander is configured to expand the second expandable tubular. The second expander is downhole of the first expander. A sensor is downhole of the second expander. The sensor is configured to detect a presence of a wellbore obstruction proximal to the tool.

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.

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.

A tubular component configured to be interposed between parts of a drill string used with a cased wellbore. A lobe is supported on and projects from an outer surface of the tubular component. The lobe causes the tubular component to have a cross-sectional profile that is asymmetric relative to an axis of symmetry of the drill string. As the drill string and tubular component rotate, the lobe contacts debris within the wellbore. The lobe also causes the drill string to rotate eccentrically, helping to reduce friction between the drill string and wellbore and dislodge a stuck drill string.

An integral permanent bridge plug assembly for a wellbore. The integral permanent bridge plug assembly includes a permanent bridge plug mounted to a cylindrical body, a setting sleeve, a bottom connection, an engagement assembly mounted to an outer diameter of the cylindrical body that is selectively extendible between a recessed position and an extended position, and a scraper including a plurality of blades and configured to engage the wellbore tubular in which the permanent bridge plug is to be set. The wellbore has a wellbore tubular having an internal diameter surface. When deployed, the integral permanent bridge plug assembly is configured to both scrape the internal diameter surface of the wellbore tubular and set an isolation barrier in a single trip into the wellbore.

An integral permanent bridge plug assembly for a wellbore. The integral permanent bridge plug assembly includes a permanent bridge plug mounted to a cylindrical body, a setting sleeve, a bottom connection, an engagement assembly mounted to an outer diameter of the cylindrical body that is selectively extendible between a recessed position and an extended position, and a scraper including a plurality of blades and configured to engage the wellbore tubular in which the permanent bridge plug is to be set. The wellbore has a wellbore tubular having an internal diameter surface. When deployed, the integral permanent bridge plug assembly is configured to both scrape the internal diameter surface of the wellbore tubular and set an isolation barrier in a single trip into the wellbore.

Systems, methods, and tools for economically performing downhole well maintenance, utilizing a flexible reinforced hose and maintenance tools designed to work with the hose. Tools include well perforation cleaning tools using water jets and/or brushes, pad removal tools, sand bailing tools, and fluid level meters.

A slurry outlet system including a top sub, a closure sleeve movable relative to the top sub between a closed position and an open position, a seal mounted on one or the other of the top sub or the closure sleeve, a protector sleeve disposed to cover the seal until displaced by one or the other of the top sub or the closure sleeve that does not include the seal during movement to the closed position. A method for pressure sealingly closing a slurry outlet system including bringing a closure sleeve into proximity with a top sub of the slurry outlet system, displacing a protector sleeve, with the closure sleeve, off a seal disposed about the closure sleeve and simultaneously making sealing contact between the top sub and the seal.