Wells – Processes – With indicating – testing – measuring or locating
Patent
1986-09-08
1988-04-26
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
166370, 166369, E21B 4700, E21B 4312
Patent
active
047398302
ABSTRACT:
A method of collecting geothermal steam using Acoustic Emission Microseismic Activity (AE/MA) measurement includes the steps of (a) surveying an AE wave emitted in subsurface cracks to obtain the size of a water permeable geothermal reservoir by analyzing the AE wave, (b) further surveying the AE wave emitted in and around the periphery of the geothermal reservoir, (c) operating the wellhead valve of the geothermal well connected with the geothermal reservoir, thereby extending or preventing the extension of the geothermal reservoir in accordance with the information obtained in step (a) and/or step (b), thereby stably obtaining a predetermined quantity of steam of high quality. Thus, the method can stably obtain geothermal steam of high quality by accurately surveying or monitoring subsurface cracks by an AE measurement technique and propagating the subsurface cracks or suppressing the propagation of the cracks.
REFERENCES:
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patent: 4057780 (1977-11-01), Shuck
patent: 4280200 (1981-07-01), Silverman
patent: 4432078 (1984-02-01), Silverman
patent: 4524434 (1985-06-01), Silverman
Hideaki Takahashi et al., "Determination of Fracture Toughness of Granitic Rock by Means of AE Technique", Journal of Mining and Metallurgical Institute of Japan, vol. 100, No. 1151, Jan. 1984.
Katsuto Nakatsuka, et al., "In-Situ Measurement of the Extension of Hydraulically-formed Fracture in Geothermal Well by Means of Acoustic Emission", Journal of Mining and Metallurgical Institute of Japan, vol. 98, No. 1129, Mar. 1982.
Morihiko Takanohashi et al., "Evaluation of Rock Fracture Toughness in the Presence of Pressurized Water at Elevated Temperature by Means of AE Technique", Proceedings of the 6th Japan Symposium on Rock Mechanics, pp. 391-396, Dec. 1984, (corresponds to Progress in Acoustic Emission II), pp. 624-631, Oct. 1984.
Chiba Fumihiko
Nakatsuka Katsuto
Niitsuma Hiroaki
Sato Ko
Takahashi Hideaki
Japan Metals & Chemicals Co. Ltd.
Kisliuk Bruce M.
Nakatsuka K.
Niitsuma H.
Novosad Stephen J.
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