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Microseismic Monitoring of Non-Proppant Acid Hydraulic Fracturing in Horizontal Well
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Horizontal Wells. Problems and Prospects 2015, Oct 2015, Volume 2015, p.1 - 5
Abstract
The objective of this work was to monitor a half-length, hight and azimuth of hydraulic fractures, developed during each stage of a non-proppant acid fracturing in carbonate reservoir with low fracking fluid volume and pumping rate.
Monitoring of 4-stage hydraulic fracture monitoring process in a horizontal well was performed from a near-by well with an array of 12 3-component borehole seismic tools VSI (Versatile Seismic Imager), separated with a 30 m bridles. 3-component tools sensors were oriented and velocity model calibrated by performing a primacord shots in the third well. As a result, initial velocity model, built using P and S sonic, was calibrated and used later for exact spatial location of microseismic events, occured during rock fracturing.
Large number of microseismic events been recorded for each stage, clearly defining 3D geometry and dynamics of fracture growth. Microseismic events were detected at a distance up to 1000 m from the geophones’ receiver array in observation well. Valuable information on fractures’ dimentions and activated by fractures rock volumes, horizontal stress directions were obtained.
It will help in further drilling and field development optimization process.
As a results, the first in Russia and arguably, first in the world, valid microseismic hydraulic fracture monitoring results for proppant-less acid fracturing with low pumping rates in carbonates were obtained.