Hydraulic delay tool for non-selective perforating operations in oil wells

Abstract

Hydraulic delay tool enabling delayed detonation of perforating guns in non-selective oil-well perforating. The tool integrates two systems: a hydraulic delay system and a pressure multiplier. The delay system comprises a first chamber with viscous fluid, a piston that moves linearly to drive the fluid through a pressure-reduction orifice, and a rupture disc that breaks at a predetermined pressure, admitting well fluid. Piston displacement establishes the required delay before detonation. The pressure multiplier uses well-fluid pressure entering a hydraulic-fluid chamber, where a multiplier piston travels, amplifies pressure, and actuates a firing mechanism to detonate the perforating guns. The tool is designed for integration into a non-selective perforating gun string including an anchor, a firing head, and the guns to be detonated. Delay time is set by adjusting the viscous-fluid volume and/or pressure. The invention provides improved control and flexibility for oil-well perforating and safety.

Dependencies are inferred from the claim text.