A New Technique to Predict In-Situ Stress Increment due to Slurry Injection into Sandstone Formations: Case Study from a Biosolids Injector in Los Angeles, California, USA

2018 ◽  
Author(s):  
S. M. Kholy ◽  
A. G. Almetwally ◽  
I. M. Mohamed ◽  
M. Loloi ◽  
A. Abou-Sayed ◽  
...  
Keyword(s):  
Los Angeles ◽  
In Situ Stress ◽  
New Technique ◽  
Stress Increment ◽  
A New Technique ◽  
Slurry Injection

A New Technique to Predict In Situ Stress Increment Due to Biowaste Slurry Injection Into a Sandstone Formation

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Sherif M. Kholy ◽  
Ahmed G. Almetwally ◽  
Ibrahim M. Mohamed ◽  
Mehdi Loloi ◽  
Ahmed Abou-Sayed ◽  
...  
Keyword(s):  
Function Analysis ◽  
Injection Pressure ◽  
In Situ Stress ◽  
New Technique ◽  
Strong Impact ◽  
Stress Increment ◽  
Injection Zone ◽  
Fracture Closure ◽  
Slurry Injection

Underground injection of slurry in cycles with shut-in periods allows fracture closure and pressure dissipation which in turn prevents pressure accumulation and injection pressure increase from batch to batch. However, in many cases, the accumulation of solids on the fracture faces slows down the leak off which can delay the fracture closure up to several days. The objective in this study is to develop a new predictive method to monitor the stress increment evolution when well shut-in time between injection batches is not sufficient to allow fracture closure. The new technique predicts the fracture closure pressure from the instantaneous shut-in pressure (ISIP) and the injection formation petrophysical/mechanical properties including porosity, permeability, overburden stress, formation pore pressure, Young's modulus, and Poisson's ratio. Actual injection pressure data from a biosolids injector have been used to validate the new predictive technique. During the early well life, the match between the predicted fracture closure pressure values and those obtained from the G-function analysis was excellent, with an absolute error of less than 1%. In later injection batches, the predicted stress increment profile shows a clear trend consistent with the mechanisms of slurry injection and stress shadow analysis. Furthermore, the work shows that the injection operational parameters such as injection flow rate, injected volume per batch, and the volumetric solids concentration have strong impact on the predicted maximum disposal capacity which is reached when the injection zone in situ stress equalizes the upper barrier stress.

scholarly journals A Novel Rules Based Approach for Estimating Software Birthmark

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Shah Nazir ◽  
Sara Shahzad ◽  
Sher Afzal Khan ◽  
Norma Binti Alias ◽  
Sajid Anwar
Keyword(s):  
Fuzzy Logic ◽  
Soft Computing ◽  
Fuzzy Rule ◽  
New Technique ◽  
License Agreement ◽  
Rule Based ◽  
Software Birthmark ◽  
A New Technique

Software birthmark is a unique quality of software to detect software theft. Comparing birthmarks of software can tell us whether a program or software is a copy of another. Software theft and piracy are rapidly increasing problems of copying, stealing, and misusing the software without proper permission, as mentioned in the desired license agreement. The estimation of birthmark can play a key role in understanding the effectiveness of a birthmark. In this paper, a new technique is presented to evaluate and estimate software birthmark based on the two most sought-after properties of birthmarks, that is, credibility and resilience. For this purpose, the concept of soft computing such as probabilistic and fuzzy computing has been taken into account and fuzzy logic is used to estimate properties of birthmark. The proposed fuzzy rule based technique is validated through a case study and the results show that the technique is successful in assessing the specified properties of the birthmark, its resilience and credibility. This, in turn, shows how much effort will be required to detect the originality of the software based on its birthmark.

A new technique for in-situ measurements of bubble characteristics in bubble columns operated in the heterogeneous regime

2016 ◽  
Vol 155 ◽  
pp. 504-523 ◽  
Author(s):  
P. Maximiano Raimundo ◽  
A. Cartellier ◽  
D. Beneventi ◽  
A. Forret ◽  
F. Augier
Keyword(s):  
In Situ Measurements ◽  
Bubble Columns ◽  
New Technique ◽  
A New Technique ◽  
Bubble Characteristics

METHODS OF THE QUALITATIVE THEORY FOR THE HINDMARSH–ROSE MODEL: A CASE STUDY – A TUTORIAL

2008 ◽  
Vol 18 (08) ◽  
pp. 2141-2168 ◽  
Author(s):  
ANDREY SHILNIKOV ◽  
MARINA KOLOMIETS
Keyword(s):  
Periodic Orbits ◽  
Slow Motion ◽  
Qualitative Theory ◽  
New Technique ◽  
Modified Model ◽  
Averaging Technique ◽  
Return Mapping ◽  
Homoclinic Bifurcations ◽  
A New Technique

Homoclinic bifurcations of both equilibria and periodic orbits are argued to be critical for understanding the dynamics of the Hindmarsh–Rose model in particular, as well as of some square-wave bursting models of neurons of the Hodgkin–Huxley type. They explain very well various transitions between the tonic spiking and bursting oscillations in the model. We present the approach that allows for constructing Poincaré return mapping via the averaging technique. We show that a modified model can exhibit the blue sky bifurcation, as well as, a bistability of the coexisting tonic spiking and bursting activities. A new technique for localizing a slow motion manifold and periodic orbits on it is also presented.

In Situ NMRObservations of the Photolysis of Cymantrene and Methylcymantrene in Supercritical Fluids:  A New Technique Using High-Pressure NMR

1997 ◽  
Vol 119 (42) ◽  
pp. 10170-10177 ◽  
Author(s):  
John C. Linehan ◽  
Scott L. Wallen ◽  
Clement R. Yonker ◽  
Thomas E. Bitterwolf ◽  
J. Timothy Bays
Keyword(s):  
High Pressure ◽  
Supercritical Fluids ◽  
New Technique ◽  
A New Technique
Sign in / Sign up

Export Citation Format

Share Document