Borehole Stability and Field Stress Analysis with Azimuthal Logging-while-Drilling Technology: A Case History

2015 ◽  
Author(s):  
Shaikh Abdul Azim ◽  
Sankar Chowdhuri ◽  
Mohammad Raffi Madar Sahib ◽  
Tarek Abdel Gawwad Mohammad ◽  
Anar Abdulkarim ◽  
...  
Keyword(s):  
Stress Analysis ◽  
Case History ◽  
Borehole Stability ◽  
Field Stress ◽  
Drilling Technology ◽  
Logging While Drilling

Study on a Data Acquisition System for Logging while Drilling

2012 ◽  
Vol 198-199 ◽  
pp. 1246-1249
Author(s):  
Sheng Hu Liu ◽  
Ya Min Xing
Keyword(s):  
Data Acquisition ◽  
High Speed ◽  
Processing System ◽  
Digital Design ◽  
System Structure ◽  
Well Drilling ◽  
Drilling Technology ◽  
Phase Sensitive ◽  
Logging While Drilling ◽  
Data Acquisition And Processing

This electronic Logging while drilling (LWD) is a new sort of well drilling technology developed in recent years. As to the traditional cable borehole survey, the LWD method has many advantages because of its higher accuracy, higher geologic strata resolution capacity, much less time and cost. To meet the current logging technology needs, A data acquisition and processing system for logging while drilling is designed．It minutely introduces the collection system structure, acquisition Program, the digital design of LWD and discusses the design and the implementation of each functional module．The system which designed on the basis of the high precise DSP and FPGA implements signal pretreatment, high speed A/D control and digitalization of the phase sensitive demodulation etc, optimizes the acquisition and processing system and supplies a new way for the development of logging while drilling．Experimental results show that system performance has attained the design requirement.

Silicon membrane filter designed by fluid dynamics simulation and near-field stress analysis for selective cell enrichment

2018 ◽  
Vol 20 (4) ◽  
Author(s):  
Yo-Chang Jang ◽  
Hyun-Ju Park ◽  
Ayoung Woo ◽  
Kyu-Sung Lee ◽  
Hui-Sung Moon ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Stress Analysis ◽  
Membrane Filter ◽  
Near Field ◽  
Dynamics Simulation ◽  
Silicon Membrane ◽  
Field Stress ◽  
Cell Enrichment

Real Time Borehole Stability Monitoring and Pre-drill Model Calibration using LWD Sonic — A Case Highlight.

2015 ◽  
Author(s):  
Sophia Weaver ◽  
Xiaohui Xiao ◽  
Rob Vines
Keyword(s):  
Model Calibration ◽  
Weight Optimization ◽  
Borehole Stability ◽  
Acoustic Data ◽  
Stability Monitoring ◽  
Development Costs ◽  
Stability Model ◽  
Logging While Drilling ◽  
Geophysical Log ◽  
Productive Time

Abstract Borehole instability challenges can account for a significant percentage of non-productive time and associated costs in drilling. This is even more so in deepwater subsea wells due to high development costs coupled with the subsurface complexities associated with turbidite reservoirs. Pre-drill borehole stability studies in this field case were performed by evaluating offset well history and geophysical log data and calibrating these against direct well measurements and drilling experiences, with the objective of recommending the appropriate mud weight. However, the validation of the pre-drill borehole stability model derived from sonic data taken in the only offset well in the field was deemed necessary for effective borehole stability monitoring in this case. Additionally, the inability to run wireline in a highly deviated well fuelled the need for acoustic data acquisition using logging-while-drilling (LWD). Sonic data was acquired by LWD (a first in the field) and this aided mud weight optimization to successfully drill the well to TD without any borehole stability problems. This paper describes the application of this solution to managing well delivery uncertainties in a deepwater field and highlights the process, results and lessons from the event to aid future applications.

Structural analysis of pipeline stresses created by line lowering

1987 ◽  
Vol 14 (6) ◽  
pp. 719-727 ◽  
Author(s):  
Sid Czinkota
Keyword(s):  
High Pressure ◽  
Structural Analysis ◽  
Natural Gas ◽  
Stress Analysis ◽  
Key Words ◽  
Case History ◽  
Axial Stress ◽  
Axial Strain ◽  
Critical Factor ◽  
The Other

To increase the depth of soil which covers a buried steel pipeline, the line can be lowered without cutting and welding. The degree of curvature in the new profile is the critical factor for controlling the resultant strains. Presented are two methods of calculating the required profile for a line containing high-pressure natural gas. One of the two is selected as being more efficient than the other and is compared with other known methods. Finally, a case history using the new method is presented. Key words: pipelines, gas pipelines, structural analysis, stress analysis, axial stress, axial strain, deflection, curvature, profiles.

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