scholarly journals Multi-Aquifer Parameterization with well loss in Vertical Flows

2015 ◽  
Vol 4 (1) ◽  
pp. 9-22
Author(s):  
P.K Majumdar
Keyword(s):  
Well Loss

scholarly journals Estimation of Transmissivity and Permeability in Swedish Bedrock

1977 ◽  
Vol 8 (2) ◽  
pp. 103-116 ◽  
Author(s):  
Leif Carlsson ◽  
Anders Carlstedt
Keyword(s):  
Statistical Analysis ◽  
Test Data ◽  
Hydraulic Properties ◽  
Pumping Test ◽  
Crystalline Rocks ◽  
Wide Range ◽  
Well Loss

Statistical analysis of pumping-test data from wells have been used to calculate average values of transmissivity and permeability in different Swedish rocks. The influence of the well-loss on the calculations is discussed. The highest values of transmissivity and permeability of the investigated rocks are found in the sandstones of Algonkian and Cambrian age. The Archean crystalline rocks show a wide range of results, and of the investigated rocks the gneisses seem to be more permeable than the granites. However, the degree of tectonization affects the hydraulic properties of the rocks considerably.

We all fail in interviews

2018 ◽  
Author(s):  
Duncan Harding
Keyword(s):  
Future Performance ◽  
It Impacts ◽  
Bounce Back ◽  
Well Loss

This chapter considers failure in an interview, how it impacts on us as candidates, and how it can be utilized to improve our future performance. Learning from past mistakes is essential in the process of preparing and performing in an interview, and the best lessons are when things don’t go well. Loss and failure are an opportunity for growth if harnessed correctly. This chapter looks at techniques to employ during an interview, to help bounce back after mistakes have been made. The chapter also includes a practical exercise that can help us as candidates constructively analyse a failed interview after the event.

Lost Circulation

2015 ◽  
pp. 1295-1315
Author(s):  
Nediljka Gaurina-Medjimurec ◽  
Borivoje Pasic
Keyword(s):  
Remedial Measures ◽  
High Permeability ◽  
Successful Management ◽  
Lost Circulation ◽  
Key Factor ◽  
Potential Loss ◽  
The Cost ◽  
Well Loss ◽  
Thief Zone ◽  
Drilling Project

Lost circulation is defined as the uncontrolled flow of mud into a thief zone and presents one of the major risks associated with drilling. The complete prevention of lost circulation is impossible, but limiting circulation loss is possible if certain precautions are taken. Failure to minimize lost circulation can greatly increase the cost of drilling, as well as the risk of well loss. The risk of drilling a well in areas known to contain potential zones of lost circulation such as fractured, cavernous, or high permeability formations is a key factor in making a decision to approve or cancel a drilling project. The successful management of lost circulation should include identification of potential loss zones, optimization of drilling hydraulics, and remedial measures when lost circulation occures.

Session 13: Identifying Early Warning Signs for Depression Recurrence

2018 ◽  
pp. 233-240
Author(s):  
Laura J. Dietz
Keyword(s):  
Early Warning ◽  
Depressive Episode ◽  
Interpersonal Psychotherapy ◽  
Warning Signs ◽  
Interpersonal Therapy ◽  
Early Warning Signs ◽  
Family Based ◽  
Loss Of Appetite ◽  
Well Loss

Chapter 16 of Family-based Interpersonal Psychotherapy (FB-IPT) for Depressed Preadolescents presents the thirteenth session of family-based interpersonal therapy (FB-IPT) in which the therapist helps the preadolescent identify potential stressors that may trigger another depressive episode, emphasizing the need to be aware of early warning signs (e.g., not sleeping well, loss of appetite) that may signal a relapse or recurrence. The preadolescent is also supported in talking about these stressors and early warning signs with her parent. With the therapist’s continued assistance, the preteen enlists the parent’s help to monitor her stress and changes in functioning to catch any future episodes of depression as early as possible.

scholarly journals The Well Efficiency Criteria Revisited—Development of a General Well Efficiency Criteria (GWEC) Based on Rorabaugh’s Model

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1784 ◽  
Author(s):  
Kurtulus ◽  
Yaylım ◽  
Avşar ◽  
Kulac ◽  
Razack
Keyword(s):  
Linear Relation ◽  
Water Storage ◽  
Loss Coefficient ◽  
Abu Dhabi ◽  
Data Set ◽  
P Values ◽  
Well Efficiency ◽  
Wide Range ◽  
The World ◽  
Well Loss

The Strategic Water Storage & Recovery (SWSR) Project in Liwa, Abu Dhabi is a leading and unique hydrogeology project in the world because of both its financial and scientific dimensions. The objective of the project is to store desalinized water in the local Liwa aquifer, to be able to supply water to Abu Dhabi in case of emergency. A total of 315 recovery wells have been drilled in pursuance of the scope of the SWSR project. Out of the total 315 wells, 25 wells met construction problems and were removed from the study. The remaining 290 wells have been analyzed using step drawdown tests (SDTs) and the model of Rorabaugh. This provided a large and unique database regarding the parameters of this model: linear aquifer-loss coefficient (B), non-linear well-loss coefficient (C) and the exponent p. Analysis of this exceptional data set revealed noteworthy and novel findings: (1) the range of the exponent p values is found to be very extensive, varying from 0.35 to 6.01. For comparison, the highest values of p given in the literature very seldom exceed 4; (2) p behaves like a lognormal variable; (3) parameters C and p are closely correlated. A semi-logarithmic diagram displays a linear relation of p vs. log C, with a determination coefficient R² = 0.83; (4) A graphical and tabulated procedure, termed General Well Efficiency Criteria, is proposed to assess well efficiency. Given the very wide range of p values implied in this procedure, it becomes possible thus to assess the efficiency of any well analyzed with an SDT. This study finally raises questions about Jacob’s model validity, which assumes that p is constant and equal to 2.

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