A method of cleaning the 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, each said cord further defined by an inner sheath and an outer sheath;
- 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 a 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 separate containers from said tubes;
- positioning said detonators adjacent to and in contact with the ends of said first, second and third tubes with saidsaid second and third detonators being positioned between said second and third tubes;
- inserting adjacent ends of said second and third tubes into the other ends of said second and third connector sleeves with the ends of said tubes adjacent said second and third detonator caps, respectively;
- securing said first and second connector sleeves to said first and second tubes respectively;
- inserting the end of said first tube into the other end of said third connector sleeve, and securing said first connector sleeve to said first connecting tube;
- connecting the first and second igniter wires of said first detonator to said series connection terminals at said second connecting point;
- disconnecting said first and second wires of said second and third 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 second and third 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.