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    • 4. 发明申请
    • Method for cutting slot-like key seats in producing formation of producing or pumping wells
    • US20070187100A1
    • 2007-08-16
    • US11354266
    • 2006-02-14
    • Anatoly N. IvanovArtem Anatolveich IvanovArtem Ivenovich TiehonovJaka PalterBoris Keyser
    • Anatoly N. IvanovArtem Anatolveich IvanovArtem Ivenovich TiehonovJaka PalterBoris Keyser
    • E21B43/11
    • E21B43/114
    • This method relates to the fields of mining, specifically oil, gas and hydro-geological industries and is intended for relief of tangential stress which originates in well side areas of producing formation from underground pressure by means of cutting vertical slot-shaped seats in well side zones of producing formation.The determined task is solved by introducing essential changes into the known method of constructing slot-like key seats from the well wall inside the rock consisting of generation of hydro-abrasive jet, its transportation to the perforator's nozzle, which is lowered into the well inside the casing pipe and directed towards the rock, and the nozzle's travel along the surface of the forming seat.The changes are as follows:—The slot-like seat is automatically formed out of the series of drainage canals on the seat surface which are performed one after another;—The perforator is moved from the place of the previous drainage canal to the place of forming the next one by step when it is switched off; Each drainage canal is formed when the perforator is in immovable position with regard to the casing pipe walls;—The moment of casing pipe cutting is fixed by spasmodic drop of hydro-abrasive jet pressure in pressure line which is not less than 10%;—Time T of forming each drainage canal after cutting the casing pipe is calculated according to the following formula (1): T = σ   mr Mabr   V   min ( 1 ) where: σ—breaking point of rock, in which the drainage canal is formed; mr—body of rock which carried out the drainage canal; mabr—mass of operating fluid with abrasive, pumped in time T;Vmin—minimal speed of abrasive particle in working jet that ruins the rock, in which the drainage canal is formed. It s calculated by the following formula: Vmin=σ/mabr; The process of drainage canal formation is stopped T min after the casing pipe cutting; Then the perforator is switched off and moved to the place of cutting the next opening in the casing pipe in order to form the next drainage canal;—The process of forming the next and subsequent canals is stopped T min after not less than 10% uneven reduction of the abrasive jet pressure. To optimize the construction of slot-like key seat, centers of the adjacent drainage canals are placed at a distance of the drainage port diameter ±5%. The moment of destruction the crosspiece between the previous and the drained canals can be determined by the second jumping reduction of the abrasive jet pressure which took place in the process of the next canal drainage. The number of drainage canals is determined by means of dividing the producing formation thickness by the drain port diameter. In order to construct vertically oriented seat the drainage canals are placed vertically one under another by means of lowering the perforator nozzle. In order to construct horizontal seat the drainage canals are placed horizontally by means of turning the perforator nozzle. In order to construct sloping seat the drainage canals are placed slanted by means of vertical movement of the perforator nozzle with its simultaneous turn.