Browse Prior Art Database

Hollow Whipstock Concept for Multilaterals

IP.com Disclosure Number: IPCOM000248465D
Publication Date: 2016-Dec-02
Document File: 1 page(s) / 118K

Publishing Venue

The IP.com Prior Art Database

Related People

Steven D. Dornic: AUTHOR

Abstract

The idea is to use a hollow whipstock for multilateral well installations so that no additional trips are required to complete a multilateral well compared to simply sidetracking a well, while retaining an option for mechanical access to the mainbore and obtaining an in-situ seal test of each multilateral leg.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Hollow Whipstock Concept for Multilaterals

The idea is to use a hollow whipstock for multilateral well installations so that no additional trips are required to complete a multilateral well compared to simply sidetracking a well, while retaining an option for mechanical access to the mainbore and obtaining an in-situ seal test of each multilateral leg.  The hollow whipstock is installed with tail pipe including a temporary barrier below it.  The well is sidetracked as with a typical whipstock operation.  The hollow section of the whipstock may be protected by a thixotropic fluid and a simple screen-type debris barrier to limit potential of debris falling into the hollow whipstock while drilling the lateral.

Once the lateral is drilled, the lower lateral completion is installed.  Subsequently a y-block type junction with two legs is installed in the hollow whipstock.  One leg seals in the bore of the lower lateral completion and the other leg seals in the tail pipe of the hollow whipstock.  Once a pressure test of the seals is achieved downhole, temporary barriers in the lateral and/or mainbore can be removed with applied surface pressure.  Any additional barriers located in the mainbore can be removed mechanically by further lowering the y-block junction into the hollow whipstock.