Efficiency of hydro slotting perforator advanced design

Abstract

The relevance of the research is caused by the need to improve the existing methods of casing perforation. A casing perforation is often complicated by a number of factors: a thin cement sheath between the watered and commingled intervals, a shallow thickness of the layer itself, etc. To perform perforation in such conditions, it is necessary to apply the technology that minimizes the stresses on production string and cement sheath. The main aim of the research is to determine the effectiveness of the integrated technology of low-permeability layer casing perforation by hydromechanical slot perforator with an improved milling cutter and followed by treatment of the opened up zone by the reagent clay reduction patented method. Methods: monitoring the implementation of the improved design of a hydromechanical slot perforator to the field experience. The article shows the results of casing perforation at the wells of petrochemical complex «Tatneft». Results. To improve the efficiency of hydro-slotting perforations, a fundamentally new design of rolling discs was developed. The structure of the invention enables to replace slot formation by deformation of the casing pipes until their blowout along the generatrix by pipe cutting. As a result, its reliability and durability increase. This enables the use of a largesized milling cutter, and, consequently, this allows obtaining a large perforation slot. The design of the perforator makes it possible to process the near well bore area with the composition patented by the authors directly through the layout of the hydroslotting perforation. On average, after slotted perforation a well oil production rate increased by 5-10 times with a corresponding decrease in water cut.

Keywords

• hydro-slotting perforation
• well workover
• casing perforation
• reagent clay reduction
• bottomhole area treatment