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Title: Spalling and the development of a hydraulic-fracturing strategy for coal. Annual report, October 1989-September 1990

Abstract

Laboratory hydraulic fracturing experiments were performed on coal blocks from a mine near Marion Center, PA, in order to identify the responsible mechanisms for the high treatment pressures in coal. Tests were performed on saturated as well as unsaturated blocks containing lined and unlined wellbores. Wellbore lining would prevent pore pressure buildup around the wellbore; it would also prevent blockage of fracture entrance by coal particles. For some of the blocks, the 'in-fracture' pressures were directly measured by placing horizontal boreholes, instrumented with pressure measuring probes, across the fracture path. Test results have indicated that the high treatment pressures observed are principally near wellbore effects. These include poroelastic effects around the wellbore and plugging of the fracture entrance at or near the wellbore. Furthermore, these tests have shown that the hypothesized mechanisms associated with fracture tip (e.g., tip plugging and collapse) and multiple parallel fracturing are not the primary causes of the high treatment pressures on a laboratory scale.

Authors:
; ;
Publication Date:
Research Org.:
Terra Tek, Inc., Salt Lake City, UT (USA)
OSTI Identifier:
5790530
Report Number(s):
PB-91-159517/XAB; TR-91-48
CNN: GRI-5087-214-1460
Resource Type:
Technical Report
Resource Relation:
Other Information: See also PB90-233818. Sponsored by Gas Research Inst., Chicago, IL
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL SEAMS; HYDRAULIC FRACTURING; STRESS RELAXATION; BENCH-SCALE EXPERIMENTS; BOREHOLES; COAL; COAL DEPOSITS; COAL MINING; COMPRESSION STRENGTH; ELASTICITY; FRACTURE PROPERTIES; FRACTURING; MECHANICAL PROPERTIES; METHANE; POROSITY; PRESSURE MEASUREMENT; RESERVOIR PRESSURE; ROCK MECHANICS; TEST FACILITIES; WELL CASINGS; ALKANES; CARBONACEOUS MATERIALS; CAVITIES; COMMINUTION; ENERGY SOURCES; FOSSIL FUELS; FUELS; GEOLOGIC DEPOSITS; HYDROCARBONS; MATERIALS; MECHANICS; MINERAL RESOURCES; MINING; ORGANIC COMPOUNDS; RELAXATION; RESOURCES; TENSILE PROPERTIES; 012031* - Coal, Lignite, & Peat- Underground Mining- Strata Mechanics & Control- (1987-)

Citation Formats

Khodaverdian, M, McLennan, J D, and Jones, A H. Spalling and the development of a hydraulic-fracturing strategy for coal. Annual report, October 1989-September 1990. United States: N. p., 1990. Web.
Khodaverdian, M, McLennan, J D, & Jones, A H. Spalling and the development of a hydraulic-fracturing strategy for coal. Annual report, October 1989-September 1990. United States.
Khodaverdian, M, McLennan, J D, and Jones, A H. 1990. "Spalling and the development of a hydraulic-fracturing strategy for coal. Annual report, October 1989-September 1990". United States.
@article{osti_5790530,
title = {Spalling and the development of a hydraulic-fracturing strategy for coal. Annual report, October 1989-September 1990},
author = {Khodaverdian, M and McLennan, J D and Jones, A H},
abstractNote = {Laboratory hydraulic fracturing experiments were performed on coal blocks from a mine near Marion Center, PA, in order to identify the responsible mechanisms for the high treatment pressures in coal. Tests were performed on saturated as well as unsaturated blocks containing lined and unlined wellbores. Wellbore lining would prevent pore pressure buildup around the wellbore; it would also prevent blockage of fracture entrance by coal particles. For some of the blocks, the 'in-fracture' pressures were directly measured by placing horizontal boreholes, instrumented with pressure measuring probes, across the fracture path. Test results have indicated that the high treatment pressures observed are principally near wellbore effects. These include poroelastic effects around the wellbore and plugging of the fracture entrance at or near the wellbore. Furthermore, these tests have shown that the hypothesized mechanisms associated with fracture tip (e.g., tip plugging and collapse) and multiple parallel fracturing are not the primary causes of the high treatment pressures on a laboratory scale.},
doi = {},
url = {https://www.osti.gov/biblio/5790530}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 1990},
month = {Mon Oct 01 00:00:00 EDT 1990}
}

Technical Report:
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