초록 ▼

An improved, simplified and less expensive apparatus and method for cleaning wells embodies an elongated tube of combustible material, sealed at its ends, that is ignited at one end to generate a pressure wave that travels along the length of the tube. Outwardly directed pressure generated within th

An improved, simplified and less expensive apparatus and method for cleaning wells embodies an elongated tube of combustible material, sealed at its ends, that is ignited at one end to generate a pressure wave that travels along the length of the tube. Outwardly directed pressure generated within the well casing by the deflagration is periodically attenuated at spaced locations along the length of the tube by a plurality of spaced short, steel sleeves circumscribing the tube and secured thereto. Three such tube sections are provided, each with its spaced, short circumscribing steel sleeves and each ignited in a selected chronological and positional sequence by three individual simultaneously electrically activated detonator caps which are provided with mutually different delay times.

대표청구항 ▼

Well cleaning apparatus for a liquid well comprising an elongated tube containing a combustible material having a deflagration rate several times greater than the speed of sound in liquid of the well, means for igniting the combustible material at one end of said tube, a plurality of mutually longit

Well cleaning apparatus for a liquid well comprising an elongated tube containing a combustible material having a deflagration rate several times greater than the speed of sound in liquid of the well, means for igniting the combustible material at one end of said tube, a plurality of mutually longitudinally spaced high strength sleeves encircling and secured to the exterior of said tube at mutually spaced longitudinal locations therealong each said sleeve having a length considerably less than the length of said tube, each said sleeve being spaced from an adjacent sleeve by a distance significantly greater than the length of such adjacent sleeve, and means for positioning the tube in said well. A method of cleaning a casing of a fluid well comprising the steps of providing first, second and third tubes of detonator cord having a substantially uniform cross section filled with combustible material, forming a suspending cable and an electrically conductive wire extending along the length thereof, forming first and second pairs of series connection terminals on said wire at first and second mutually spaced electric connection points along said cable, positioning a plurality of short mutually spaced high strength sleeves on each of said first, second and third tubes at positions mutually spaced along the length of said tubes by distance greater than the length of said sleeves, sealing the ends of each of said tubes, securing said tubes in end to end relation to said cable and electrical wire with adjacent ends of said first and second tubes spaced apart by a selected distance near said first electric connection point of said cable and the remote end of said third tube positioned near said second electric connection point, securing a first end of first, second and third connector sleeves, respectively, to first, second and third detonator caps, each said detonator cap having first and second electrical ignitor wires, securing the first and second ignitor wires of said first detonator to one another and securing the first and second ignitor wires of said second detonator to one another to prevent accidental detonation thereof, transporting said tubes, cable, wire and detonators with said detonators displaced from said tubes, positioning said detonators adjacent to and in contact with the ends of said first, second and third tubes with said first and second detonators being positioned between said first and second tubes, inserting adjacent ends of said first and second tubes into the other ends of said first and second connector sleeves with the ends of said tubes adjacent said first and second detonator caps respectively, securing said first and second connector sleeves to said first and second tubes respectively, inserting the end of said third tube into the other end of said third connector sleeve, and securing said third connector sleeve to said third connecting tube, connecting the first and second ignitor wires of said third detonator to said series connection terminals at said second connecting point, disconnecting said first and second wires of said first and second detonators from each other and connecting such first wires to said series connection terminals at said first connection point, connecting said second wires of said first and second detonators to each other, inserting said cable, electrical wire, tubes and detonators into a desired location within a well casing, and activating each of said detonators by electrically energizing said electrically conductive wire to thereby produce a series of outwardly directed pressure pulses within said well casing and effect cleaning of said casing.