Browse Prior Art Database

Predrill Process

IP.com Disclosure Number: IPCOM000084057D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Austenfeld, RS: AUTHOR [+3]

Abstract

When drilling oil wells, it is difficult to insure that the drill goes straight into the earth. Sometimes the drill wanders from a straight path, thereby creating a slanted hole. If the drill hits a rock on one side of the hole being drilled, this will tend to cause the drill to wander. Other types of nonhomogeneity in the earth also cause drill wander.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Predrill Process

When drilling oil wells, it is difficult to insure that the drill goes straight into the earth. Sometimes the drill wanders from a straight path, thereby creating a slanted hole. If the drill hits a rock on one side of the hole being drilled, this will tend to cause the drill to wander. Other types of nonhomogeneity in the earth also cause drill wander.

The same type of problem is encountered whenever attempts are made to drill long small holes in a homogeneous substance. In drilling long small holes a long drill with a small diameter must be used. Such a drill tends to be relatively flexible, thereby enhancing the possibility that the hole will not be straight.

Drill wander can be minimized by first drilling part of the hole with a short drill, which has the same or smaller diameter than the hole which is desired. After drilling part of the hole with the short drill a long drill is used to drill the remaining depth.

1