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1. (WO2016049751) SYSTEM FOR SUCCESSIVELY UNCOVERING PORTS ALONG A WELLBORE TO PERMIT INJECTION OF A FLUID ALONG SAID WELLBORE

Pub. No.:    WO/2016/049751    International Application No.:    PCT/CA2015/050348
Publication Date: Fri Apr 08 01:59:59 CEST 2016 International Filing Date: Tue Apr 28 01:59:59 CEST 2015
IPC: E21B 34/14
E21B 23/00
E21B 43/12
Applicants: SC ASSET CORPORATION
Inventors: NORDHEIMER, David
Title: SYSTEM FOR SUCCESSIVELY UNCOVERING PORTS ALONG A WELLBORE TO PERMIT INJECTION OF A FLUID ALONG SAID WELLBORE
Abstract:
A system for successively uncovering a plurality of contiguous ports in a tubing liner within a wellbore, or for successively uncovering individual groups of ports arranged at different locations along the liner, to allow successive fracking of the wellbore at such locations. Sliding sleeves in the tubing liner are successively moved from a closed position covering a respective port to an open position uncovering such port by an actuation member placed in the bore of the tubing liner. Each actuation member comprises a dissolvable plug retained by shear pins at an uphole end of a collet sleeve, the latter having radially- outwardly biased protuberances (fingers) which matingly engage sliding sleeves having cylindrical grooves therein, based on the width of the protuberance. When actuating the most downhole sleeve, the shear pin shears allowing the plug to move in the collet sleeve and prevent the protuberance (fingers) from disengaging.