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Title: Method for selectively orienting induced fractures in subterranean earth formations

Abstract

The orientation of hydraulically-induced fractures in relatively deep subterranean earth formations is normally confined to vertical projections along a plane parallel to the maximum naturally occurring (tectonic) compressive stress field. It was found that this plane of maximum compressive stress may be negated and, in effect, re-oriented in a plane projecting generally orthogonal to the original tectonic stress plane by injecting liquid at a sufficiently high pressure into a wellbore fracture oriented in a plane parallel to the plane of tectonic stress for the purpose of stressing the surrounding earth formation in a plane generally orthogonal to the plane of tectonic stress. With the plane of maximum compressive stress re-oriented due to the presence of the induced compressive stress, liquid under pressure is injected into a second wellbore disposed within the zone influenced by the induced compressive stress but at a location in the earth formation laterally spaced from the fracture in the first wellbore for effecting a fracture in the second wellbore along a plane generally orthogonal to the fracture in the first wellbore.

Inventors:
 [1]
  1. Morgantown, WV
Issue Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
OSTI Identifier:
862756
Patent Number(s):
4005750
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; selectively; orienting; induced; fractures; subterranean; earth; formations; orientation; hydraulically-induced; relatively; deep; normally; confined; vertical; projections; plane; parallel; maximum; naturally; occurring; tectonic; compressive; stress; field; found; negated; effect; re-oriented; projecting; orthogonal; original; injecting; liquid; sufficiently; pressure; wellbore; fracture; oriented; purpose; stressing; surrounding; formation; due; presence; injected; disposed; zone; influenced; location; laterally; spaced; effecting; plane parallel; laterally spaced; surrounding earth; naturally occurring; earth formations; earth formation; subterranean earth; compressive stress; relatively deep; induced fractures; /166/

Citation Formats

Shuck, Lowell Z. Method for selectively orienting induced fractures in subterranean earth formations. United States: N. p., 1977. Web.
Shuck, Lowell Z. Method for selectively orienting induced fractures in subterranean earth formations. United States.
Shuck, Lowell Z. Tue . "Method for selectively orienting induced fractures in subterranean earth formations". United States. https://www.osti.gov/servlets/purl/862756.
@article{osti_862756,
title = {Method for selectively orienting induced fractures in subterranean earth formations},
author = {Shuck, Lowell Z},
abstractNote = {The orientation of hydraulically-induced fractures in relatively deep subterranean earth formations is normally confined to vertical projections along a plane parallel to the maximum naturally occurring (tectonic) compressive stress field. It was found that this plane of maximum compressive stress may be negated and, in effect, re-oriented in a plane projecting generally orthogonal to the original tectonic stress plane by injecting liquid at a sufficiently high pressure into a wellbore fracture oriented in a plane parallel to the plane of tectonic stress for the purpose of stressing the surrounding earth formation in a plane generally orthogonal to the plane of tectonic stress. With the plane of maximum compressive stress re-oriented due to the presence of the induced compressive stress, liquid under pressure is injected into a second wellbore disposed within the zone influenced by the induced compressive stress but at a location in the earth formation laterally spaced from the fracture in the first wellbore for effecting a fracture in the second wellbore along a plane generally orthogonal to the fracture in the first wellbore.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {2}
}

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