Secondary Formation Exposure by Hydromechanical Perforation


1. Hydroslot Perforation



... Application of this technology allows to form a vertical slot of great extent with a width of 10-21 mm in a given interval of a production column and to deposit cavern hydraulically through it acting by flush jet on a cement ring and rock. The given technology consists in enlarging the slot by a perforator roller lowered in tubing, destroying the cement ring after that and flushing the rock with a help of a jet extension. At that porous and slot partials are engaged in the process in the part of a production bed untouched by colmatation ...

Features:


  • this technology permits to perform operations on formation exposure without sharp impact loads on a cement stone and a critical area of a well;

  • the perforator is able to make a deep-seated washout of a rock up to 300 - 400 mm, i.e., beyond the colmatation zone, making available multiple increasing of a sum filtration surface and adventing all interlayers of a production formation into operation;
  • the specific area of a production formation exposure is in 80% - 90% larger and the radius of penetration is in 2 times higher than in cumulative perforation;
  • this technology permits to expose selectively productive inerlayers only, without damaging bridges between them.

2. Hydromechanical Perforation


Application:

It is used for a secondary production formation exposure and creation of special holes for a cement stone building up behind the production column by drilling teams.

The PGM perforator is capable to perform two diameter opposite casing holes of 12x40 mm at a length from 40 to 90 mm.

Action Principle:

The action principle consists in conversion of fluid hydraulic energy into an axial movement of a stem and from the axial movement into a radial movement of cutters.

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