Understanding Unusual Diagnostic Fracture Injection Test Results In Tight Gas Fields - A Holistic Approach To Resolving The Data

2015 ◽  
Author(s):  
Rajarajan Narayanasamy Naidu ◽  
Ernesto A Guevara ◽  
Allan J Twynam ◽  
Jose Ignacio Rueda ◽  
William Dawson ◽  
...  
Keyword(s):  
Holistic Approach ◽  
Tight Gas ◽  
Test Results ◽  
Injection Test ◽  
Gas Fields

Understanding Unusual Diagnostic Fracture Injection Test Results in Tight Gas Fields - A Holistic Approach to Resolving the Data

2015 ◽  
Author(s):  
R.N.. N. Naidu ◽  
E.A.. A. Guevara ◽  
A.J.. J. Twynam ◽  
J.. Rueda ◽  
W.. Dawson ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Test Procedure ◽  
Holistic Approach ◽  
In Situ Stress ◽  
Lessons Learned ◽  
Petroleum Engineering ◽  
Tight Gas ◽  
Review Team ◽  
Gas Fields ◽  
The Impact

Abstract Hydraulic fracturing is a commonly used completion approach for extracting hydrocarbon resources from formations, particularly in those formations of very low permeability. As part of this process the use of Diagnostic Fracture Injection Tests (DFIT) can provide valuable information. When the measured pressures in such tests are outside the expected range for a given formation, a number of possibilities and questions will arise. Such considerations may include: What caused such inflated pressures? What is the in-situ stress state? Was there a mechanical or operational problem? Was the test procedure or the test equipment at fault? What else can explain the abnormal behaviour? While there may not be simple answers to all of these questions, such an experience can lead to a technically inaccurate conclusion based on inadequate analysis. A recently completed project faced just such a challenge, initially resulting in poor hydraulic fracturing efficiency and a requirement to understand the root causes. In support of this, a thorough analysis involving a multi-disciplinary review team from several technical areas, including petrophysics, rock/geo-mechanics, fluids testing/engineering, completions engineering, hydraulic fracture design and petroleum engineering, was undertaken. This paper describes the evolution of this study, the work performed, the results and conclusions from the analysis. The key factors involved in planning a successful DFIT are highlighted with a general template and a work process for future testing provided. The importance of appreciating the impact of the drilling and completion fluids composition, their properties and their compatibility with the formation fluids are addressed. The overall process and technical approach from this case study in tight gas fields, will have applicability across similar fields and the lessons learned could help unlock those reserves that are initially deemed technically or even commercially unattractive due to abnormal or unexpected behaviour measured during a DFIT operation.

scholarly journals Maturation of HPHT Tight Gas Fields in North Oman

2013 ◽  
Author(s):  
Qassim Al Riyami ◽  
Andreas P. Briner ◽  
Andreas P. Briner ◽  
Hamood al Habsi ◽  
Edwin Lamers
Keyword(s):  
Tight Gas ◽  
Gas Fields

Composite repair of sub-sea pipelines

2011 ◽  
Vol 51 (2) ◽  
pp. 729
Author(s):  
Colin Wood ◽  
Karen Kozielski ◽  
Wendy Tian ◽  
Song Gao ◽  
Jonathan Hodgkin ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Prolonged Exposure ◽  
Mechanical Test ◽  
Extended Period ◽  
Mechanical Analysis ◽  
Test Results ◽  
Metal Structures ◽  
Oil And Gas Fields ◽  
Gas Fields ◽  
Safety And Environment

The development of new deepwater oil and gas fields provide an opportunity for increased use of new materials. Conventional infrastructure is constructed using significant quantities of steel and concrete, which is becoming less practical in comparison to new light weight, easy to handle composites. When infrastructure needs to be repaired, there is often a requirement for underwater welding, which carries considerable occupational health, safety and environment (OHSE) risks. For this reason, moving away from traditional metal structures or repair technologies is increasingly attractive. In recent years a number of new water activated composite wrap materials have been developed for use in underwater applications. The materials properties that are required can be difficult to achieve and maintain over an extended period of exposure to the marine environment, though, so many research groups are working on this challenge. A comprehensive literature review has been undertaken to identify present state of the art ideas for the development of improved underwater materials and this will be discussed in the context of adhesive applications. Preliminary material characterisation work will be described where new resins have been formulated to perform well in marine environments and survive prolonged exposure to seawater. Experiments were carried out in artificial seawater and samples left to cure at a range of temperatures DSC and dynamic mechanical analysis (DMTA) were used to evaluate the crosslink density of the network and the glass transition temperature respectively, while FTIR was used to determine the chemical structure in the cured systems. Preliminary mechanical test results have shown significant improvement in strength for the new formulations compared to a set of control samples of commercially available materials.

Coiled Tubing Operational Guidelines in Conjunction with Multistage Fracturing Completions in the Tight Gas Fields of Saudi Arabia

2012 ◽  
Author(s):  
Mohammed Al Gazal ◽  
Justin Tate Abel ◽  
Stuart Wilson ◽  
Henry Wortmann ◽  
Bryan Bruce Johnston
Keyword(s):  
Saudi Arabia ◽  
Tight Gas ◽  
Coiled Tubing ◽  
Gas Fields

scholarly journals On optimal stability-test spacing for assessing snow avalanche conditions

2010 ◽  
Vol 56 (199) ◽  
pp. 795-804 ◽  
Author(s):  
Karl W. Birkeland ◽  
Jordy Hendrikx ◽  
Martyn P. Clark
Keyword(s):  
Spatial Variability ◽  
Holistic Approach ◽  
Stability Test ◽  
Test Results ◽  
Stability Tests ◽  
Spatial Complexity ◽  
Test Type ◽  
Optimal Distance ◽  
Weather Observations ◽  
Stability Measurements

AbstractAssessing snow stability requires a holistic approach, relying on avalanche, snowpack and weather observations. Part of this assessment utilizes stability tests, but these tests can be unreliable due in part to the spatial variability of test results. Conducting more than one test can help to mitigate this uncertainty, though it is unclear how far apart to space tests to optimize our assessments. To address this issue we analyze the probability of sampling two relatively strong test results over 25 spatial datasets collected using a variety of stability tests. Our results show that the optimal distance for spacing stability tests varies by dataset, even when taking the sampling scheme and stability-test type into account. This suggests that no clear rule currently exists for spacing stability tests. Our work further emphasizes the spatial complexity of snow stability measurements, and the need for holistic stability assessments where stability tests are only one part of a multifaceted puzzle.

scholarly journals DUS II SOIL GAS SAMPLING AND AIR INJECTION TEST RESULTS

2012 ◽  
Author(s):  
J. Noonkester ◽  
D. Jackson ◽  
W. Jones ◽  
W. Hyde ◽  
J. Kohn ◽  
...  
Keyword(s):  
Soil Gas ◽  
Air Injection ◽  
Test Results ◽  
Injection Test ◽  
Gas Sampling ◽  
Soil Gas Sampling
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