Abstract: A self-clearing filter for filtering a fluid, the self-clearing filter comprising a filter wall having a lumenous side and an external side and a pump for creating a flux of the fluid to impinge against the external side of the filter wall. Methods for filtering a fluid by diverting a portion of the fluid flux to impinge against the filter.

Abstract: A geological perforating tool (gun) shape charges disposed at an angle that provides an improvement over other known embodiments by accurately securing the charges in the tool to facilitate reliable, reproducible focus of the shaped charges. Charges are disposed on metal strips fitted into slots that are precision cut at predetermined angles in a tool barrel circumference.

Abstract: The invention is directed to controlling sand production in an oil and/or gas well. A preferred embodiment of the invention is directed to repairing a downhole screen by pumping neutrally buoyant resin coated material into a damaged portion of a gravel pack screen and also into any void behind the damaged portion of the screen. The neutrally buoyant resin provides for the repair of a portion of the screen even if the damaged portion is located on the uphole side of a deviated well. Any excess resin coated material may subsequently be removed from the central passageway of the screen and then circulated to the surface because the resin coated material is neutrally buoyant. Neutrally buoyant resin may be pumped into a well that does not have a sand control system. The porous neutrally buoyant resin allows production of hydrocarbons, but prevents production of sand into the well.

Abstract: A wellbore cleanup tool and method are described. In one embodiment, the fluid is displaced with a cup seal into the tubing/drill pipe as the seal is lowered into the wellbore. In another embodiment reverse circulation directs debris into the tubing/drill pipe as it is loosened on the trip into the hole. The returning fluid laden with debris can be directed to either below the cleaning equipment or above it when used with a cup seal and a return port adjacent to it.

Abstract: Apparatus for cleaning well bore tubulars comprises an ultrasound source suspended on a work string adapted to be run in the well, wherein the ultrasound source provides sufficient ultrasonic energy to remove scale or other undesirable debris or particles from, the well bore tubular.

Abstract: An apparatus for cleaning subterranean wellbores is described. The apparatus comprises a rotatable jet head with less than five axially separated nozzles through which an abrasive fluid is discharged. The nozzles are mounted with an axial separation of preferably more than 0.5 times the nozzle diameter.

Abstract: A well cleaning attachment useful as a part of a collection of tools sent down a well bore on a tubing string includes a tubular mandrel provided with a plurality of longitudinal slots in which corresponding knife carriers are inserted. Each carrier is bedded on a leaf spring for radial motion within the slot and each is provided with a spring biased blade extending pivotally to the exterior. Two collars then fix the carriers within the slots, the same collars also engaging the periphery of the mandrel.

Abstract: A water pressure cleaning assembly useful in cleaning out the perforations in a well casing includes a mandrel structure defined by an upper cylindrical segment and a lower conical segment. An upper and lower annular seal is movable respectively along the upper and lower segments to allow relative motion of the mandrel structure within the annuli thereof. This lateral motion then allows the passage of the assembly across irregularities in the casing.

Abstract: In accordance with an illustrative embodiment of the present invention, a well perforation cleaning tool includes a fluidic oscillator that creates pressure changes which induce cyclical stresses in the damaged skins of the perforations and causes the skins to disintegrate in order to improve the productivity of the well. Cylindrical filter tubes having a plurality of sets of slots are adjustably mounted at the upper and lower ends of the tool to provide resistances which confine the pressure changes to the immediate vicinity of the perforated interval.

Abstract: A well casing cleaning assembly includes a cylindrical mandrel in which a spiral arrangement of transverse drillings is formed each of the drillings receiving a coiled spring intermediate the bases of exteriorly projecting knife blades. A set of arcuate plate segments, provided with vertical slots at each of the drillings, is then secured to the exterior of the mandrel compressing the springs and exposing the blade ends. An upper and lower packing on the mandrel then confines pressurized cleaning fluid.

Abstract: A wash tool for stimulating oil wells having brushes and/or blades mounted to retractable tool blocks, whereby the brushes or blades can be introduced in the well out of contact with the well liner, and thereafter extended into contact with the liner.

Abstract: A well cleaning apparatus and method of treating a well includes a generally tubular implement which has a first section with adjustable, radially extending cables, and a second section with cable loops extending outward, a bottom cone-shaped plug and a top plug. The first section cables can be anchored by rotating or sliding a crimping tube therein, or by molten material poured therein. The second section cable length can be adjusted by a sliding base bracket. The first section chops up scale, sludge and tar while the second section cables sweep them away. The method includes these steps, as well as steaming the casing at high pressure and low water volume to aid cleaning, and stimulate formation flow without creating sand bailing problems. The apparatus can be attached to the bottom of a well pump, with several first sections spaced along the length of the work string of the pump to enable cleaning of the entire well casing by a limited upward and downward movement of the entire assembly.

Abstract: A fluid operated cylinder is suspended from a crane by a cable and has a piston rod connected by a cable to a cleaning unit for supporting the cleaning unit within the screened inlet portion of a water well casing extending into the ground. Air is supplied to the cylinder through a solenoid valve which is controlled in response to movement of the piston to produce reciprocation of the piston and corresponding movement of the cleaning unit within the well casing.

Abstract: A liner cleaning tooling comprising an elongate vertically extending cylindrical body, coupling means at the upper end of the body to connect with a fluid conducting run-in pipe string, a central longitudinal flow passage in the body communicating with the pipe string and opening downwardly, an enlarged, central, axially extending cylindrical chamber in the body between the upper and lower end portions of the flow passage, a plurality of circumferentially spaced ball receiving openings in the body communicating between the exterior of the body and the chamber, an elongate axially shiftable mandrel with a downward and radially inwardly convergent conical surface slidably engaged in the chamber and having a central longitudinal fluid conducting opening, a helical compression spring in the chamber above the mandrel and engaging and normally yieldingly urging the mandrel downwardly and a ball rotatably and axially shiftably arranged in each opening and having an outer liner engaging portion projecting radially ou