Bond Evaluation as a Decision under Certainty, Risk or Uncertainty

1968 ◽  
Vol 70 (1) ◽  
pp. 43
Author(s):  
C. M. Schilbred
Keyword(s):  
Bond Evaluation

Cased borehole acoustic-wave propagation with varying bonding conditions: Theoretical and experimental modeling

Geophysics ◽  
2019 ◽  
Vol 84 (4) ◽  
pp. D161-D169
Author(s):  
Can Jiang ◽  
Xue-Lian Chen ◽  
Yuan-Da Su ◽  
Xiao-Ming Tang
Keyword(s):  
Acoustic Wave ◽  
Wave Theory ◽  
Acoustic Measurements ◽  
Acoustic Wave Propagation ◽  
Velocity Change ◽  
Slip Boundary ◽  
Wave Measurements ◽  
Bonding Condition ◽  
Bond Evaluation ◽  
Cased Borehole

Acoustic measurements in cased boreholes are important for cement-bond evaluation behind the casing. In conjunction with a recently developed acoustic-wave theory using slip-boundary modeling, we carried out an experimental study for different cement-bond conditions. Four different cased-hole models were constructed, where the interface between the casing and the cement, and that between the cement and the formation, are decoupled or partially bonded to simulate the different cement bond conditions. An acoustic system is placed in the borehole to measure extensional casing waves along the borehole. By extracting the attenuation and velocity of casing waves from the experimental data, the bonding conditions were analyzed and compared with the theoretical modeling. The results indicate that, compared with the free-pipe situation, the casing waves are attenuated when there is some degree of bonding (good or poor) between the casing and the formation. However, when the poor bonding occurs at the cement-formation interface, the casing wave indicates significant velocity reduction and dispersion, the degree of the velocity change varying with the bonding condition. This wave phenomenon is predicted by the slip-boundary modeling. By adjusting the slip-boundary parameters in the modeling, the experimental results can be quantitatively modeled. These results are also confirmed by cased-hole acoustic logging data examples. The theoretical model can therefore be used to interpret cased-borehole acoustic-wave measurements.

scholarly journals Numerical study of the effect of cement defects on flexural-wave logging

Geophysics ◽  
2019 ◽  
Vol 84 (4) ◽  
pp. D171-D177
Author(s):  
Ruolong Song ◽  
Hefeng Dong ◽  
Xueshan Bao
Keyword(s):  
Group Velocity ◽  
Numerical Study ◽  
Staggered Grid ◽  
Flexural Wave ◽  
Burial Depth ◽  
Flexural Waves ◽  
Wave Technique ◽  
Bond Evaluation ◽  
Pulse Echo ◽  
Leaky Lamb Wave

Cement-bond evaluation is needed for new wells and plug and abandonment activities. The ultrasonic leaky Lamb-wave (also called the flexural-wave) technique, in combination with the pulse-echo technique, has been widely used for cement-quality evaluation. Using a 2D time-domain staggered-grid stress-velocity finite-difference methodology, we have numerically investigated the attenuation and group velocity of flexural waves, and the scattering from defects, in the presence of a water-filled void in the cement annulus. The position, length, thickness, and burial depth of a defect are considered. The numerical study suggests that the combination of the attenuation and group velocity of the flexural wave allows for a discrimination between solids and liquids. The scattering from voids can be used to indicate the existence of a hidden defect, which cannot be detected by using the attenuation and group velocity if it is located larger than 5 mm away from the casing. The void signatures can even be used to characterize the geometry of the defect for neat cement. The numerical results provide improved understanding of flexural-wave logging results.

On site composites-to-masonry bond evaluation in presence of rising damp and salt crystallization

2016 ◽  
pp. 365-372 ◽  
Author(s):  
G. Cardani ◽  
L. Binda ◽  
M.R. Valluzzi ◽  
P. Girardello ◽  
M. Panizza ◽  
...  
Keyword(s):  
Salt Crystallization ◽  
Bond Evaluation ◽  
Rising Damp

Adhesive bond evaluation by nondestructive testing techniques

1992 ◽  
Vol 25 (2) ◽  
pp. 99
Author(s):  
G.B. Fagan ◽  
R.W. Anthony ◽  
J. Bodig ◽  
G.P. Krueger
Keyword(s):  
Nondestructive Testing ◽  
Adhesive Bond ◽  
Testing Techniques ◽  
Bond Evaluation

Numerical simulation of Sector Bond log and improved cement bond image

Geophysics ◽  
2012 ◽  
Vol 77 (4) ◽  
pp. D95-D104 ◽  
Author(s):  
Ruo-Long Song ◽  
Jin-Xia Liu ◽  
Chun-Hui Hou ◽  
Ke-Xie Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Difference ◽  
Field Data ◽  
New Approach ◽  
Channel Size ◽  
Well Production ◽  
Well Completion ◽  
Bond Evaluation ◽  
Potential Channels ◽  
Acoustic Responses

The two principal functions of a primary cement job are to provide support for the casing and to provide hydraulic isolation between zones. A poor cement job may cause many issues during the well production. Therefore, cement bond evaluation is very important in well completion. The Sector Bond log (SBL) has been widely used for cement bond evaluation for years. The SBL tool has eight pairs of directional transmitter-receivers, which are equally distributed in azimuth and used for identifying channels and channel azimuths. To better understand SBL, using a parallel 3D finite difference algorithm, we numerically simulated acoustic responses of the SBL under a variety of cement bond scenarios and investigated the sensitivity of the integral amplitudes to channel size and its azimuth. We further developed a new approach to image potential channels in cement annulus using the integral amplitudes. The comparisons between conventional SBL images and the reprocessed ones using the new approach showed significant improvement on both synthetic and field data.

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