Objective
Determination of the propagation direction and propagation distance of hydraulic fracs produced in low permeable oil-gas deposits using seismic and geoelectric methods.
1. Using aerial seismic data acquisition at the surface no results were obtained despite intensive use of data processing.
2. The propagation direction of hydraulically produced fracs can be determined by active and passive geoelectric measurements.
3. In order to determine the frac propagation distance a seismic-acoustic receiver tool suspended on a well cable has to be positioned in the frac well below the frac depth. The seismic-acoustic signals of frac events recorded during fracing can then be used to find the frac propagation distance by means of the traveltime differences between P and S wave arrivals. A triaxial receiver tool (52 mm diameter) which could pass through packer systems was under construction for further tests, however, owing to difficulties in the supply of components it could not be completed within the framework of this Research and Development Project.
Even after completion of the R & D project several test recordings should be made during frac operations to provide confirmation of the research results of both geoelectric as well as seismic-acoustic frac location.
During hydraulic fracturing of oil/gas horizons in the subsurface seismic-acoustic signals are produced, which, as long as they can be picked up at the surface or in boreholes, indicate the propagation direction and propagation distance of the frac.
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DEM - Demonstration contractsCoordinator
30635 Hannover
Germany