... Characterization Upstream Oil & Gas acoustic emission AE event evolution correlation coefficient fracture complex reservoir hydraulic fracture cloud wellbore mechanics geomechanics symposium source location monitoring Hampton 1. INTRODUCTION Reservoir rock permeability enhancement through...

... prestress interface fracture interface damage zone shear discontinuity real-time monitoring fracture heterogeneous fracture real time system source location specimen specific stiffness traction wavelet 1. INTRODUCTION Fracturing-induced damage in rock and its elastic attributes, namely: (i...

... geomechanical laboratory test programs. It is essential to develop correlations between the properties of the Cobourg limestone from the Bowmanville to Bruce sample source locations. This study presents a detailed mineralogy investigation to determine the composition of the Cobourg limestone at both locations...

... analysis sample edge cloud computing Upstream Oil & Gas acoustic emission flow in porous media Fluid Dynamics mechanism complex reservoir AE event amplitude ohtsu fracture source location injection interval characterization permeability discontinuity fracture network hydraulic...

... that viscous oil injection tends to induce Mode-I fracture while both water and L- Co 2 injection tend to induce Mode-II fracture. hydraulic fracturing polarity Reservoir Characterization proppant viscous oil source location initial motion fracturing materials Upstream Oil & Gas viscosity...

... and then distilled water (1 cP) was injected at a constant flow rate through a central cased borehole until failure. Two flow rates, 0. 2 mL/min and 0.5 mL/min were investigated and their failure sequences were analyzed in detail. A flow rate of 0.2 mL/min caused gradual failure with AE source locations aligning...

... was turned down on four channels to record unclipped waveforms during failure. Approximately 20,000 events were harvested from the continuous waveforms. A time varying velocity model was used to source locate 4,357 AE events. Continuous AE waveforms from the 40 dB and 6 dB channels were analyzed during...

... in the vicinity of an initiation notch. Six AE piezoelectric transducers manufactured by Physical Acoustics Corporation (PAC) were used. PAC’s AE source location software, AEwin, was used in order to triangulate event locations and perform waveform analysis. Attenuation analysis and curve generation was performed...

.... The most beneficial outcome of this research is the demonstration that the source location accuracy at the mine can be significantly improved through a comprehensive and highly efficient source location approach. This includes digital filtering, phase association, sensor array optimization, absolute value...

...-wave velocity was treated as a known value. However, P-wave velocity is usually difficult toobtain since ultrasonic sensors are very sensitive to sudden shocks. In the present study, acoustic emission source location wasdeveloped by treating P-wave velocity as an unknown variable and then solving...

... seconds prior to failure; AE source locations initially show a linear feature extending from the notch tip, the locations then spread laterally to the edge of the sample causing macroscopic failure . AE source mechanism analysis, based on first motion polarity response, demonstrated events were...

... of acoustic energy. The difficulties of the method lie in recording the rock noises in enough places to determine source locations in the volume of rock of interest and in interpreting the data. Some promising results have been obtained using microseismic techniques to study bump phenomena. In one study...

... the induced seismicity itself by a simultaneous inversion procedure for source location and velocity structure. Also, because it is possible to carry out repeat surveys, temporal as well as spatial variation of seismic parameters can be studied using sequential active or passive imaging methods. Anomalous...

... were fired in five boreholes to estimate the P- and S-wave velocities in the rock mass, orient the three-component sensors, and estimate the accuracy of two independent source-location techniques. The microseismic signals recorded after the fracturing operation were source located and used to estimate...

... microseismic event location technique Upstream Oil & Gas gradient base receiver solution technique velocity structure calibration blast arrival time algorithm microseismic source location computed location receiver coordinate blast site Reservoir Characterization accuracy source location...

... ABSTRACT: This paper summarizes the theories developed for an innovative and automated source location technique including input data analysis, event based velocity model determination and reliability assessment of source locations. It also presents the GRC Source Location System, a computer...

... location of micro seismic events. It is with these spatial source location coordinates that zones of increasing rock stress may be delineated. This paper presents afresh approach, based on the Simplex Method algorithm, for determining the source location of micro seismic events. Presently the location...

... with a bandwidth of 10 MHz has been realized on four channels. Four channels are the minimum required for accurate source location, although this number is insufficient for detailed study of source mechanisms. Future experiments are planned using additional channels. The sampling frequency of 10 MHz is sufficient...

... to enhance the ability to locate cavities. Zonal and hit-sequence location techniques are introduced into AE/MS monitoring schemes. These source location techniques simplify the analytical procedure yet still provide sufficient information regarding the region of AE/MS activity. The concept of unique...

... by ten minutes with a noise count below the average. The last case history is the work of Hardy and Mowery who have developed techniques to determine the source location of acoustic emission activity. As an earthquake can be located by triangulation, so too can an acoustic emission. For source location...