Investigation of Induced Microseismicity in Hydraulically Fractured Gas Wells.Final Report, January 1991-April 1992

摘要

The results of the research in microseismic methods to determine hydraulicfracture dimensions during this contract were significant. Fracture diagnostics were monitored at the SFE No. 4 and two GRI cooperative wells. One of these wells further confirmed the viability of fracture diagnostics in previously fractured wells. A preliminary study was made with synthetic seismograms of crack waves calculated for an infinite fracture. Results are encouraging and suggest a sensitivity to fracture width. The theory needs to be expanded to include a finite fracture. The GRI Hydraulic Fracture Test Site (HFTS) development planning was a major effort. Teledyne Geotech (TG) personnel attended meetings of the Planning Team, Technical Review Committee (TRC), Diagnostics R&D Team, and several Working Groups. TG and S.A. Holditch and Assoc. wrote a Preliminary Development Plan describing the facilities and capabilities of the test site. The plan was presented in detail to the TRC and Project Advisor's Group (PAG). A comprehensive design was developed for the monitoring, acquisition, and data processing systems. The Diagnostics R&D Team designed a set of experiments to answer questions and issues concerned with fracture geometry mapping. A prototype geophone/cable assembly was obtained for the Data Well 1 at the Ft. Worth Basin candidate site. Teledyne Geotech aided GRI in presenting the hydraulic fracture diagnostics techniques to three candidate Field Test Partners. No agreements were completed despite many contacts.