Stratigraphic Characterization of the Eagle Ford Shale to Identify the Best Landing Zone: A Semi-analytical Workflow

2022 ◽  
pp. 1-62
Author(s):  
Ajit K. Sahoo ◽  
Vikram Vishal ◽  
Mukul Srivastava
Keyword(s):  
Local Level ◽  
Well Performance ◽  
Eagle Ford Shale ◽  
Eagle Ford ◽  
Landing Zone ◽  
Production Behavior ◽  
Key Drivers ◽  
The Relationship

Placement of the horizontal well within the best landing zone is critical to maximize well productivity, thus identification of the best landing zone is important. This paper illustrates an integrated semi-analytical workflow to carry out the stratigraphic characterization of the Eagle Ford shale to identify the best landing zone. The objective of this work is twofold: 1) to establish a workflow for stratigraphic characterization and 2) to understand the local level variability in the well performance.To establish the workflow, we have used the production data, petrophysical information and regional reservoir property maps. As a first step of the workflow, we subdivided the Eagle Ford shale into nine smaller stratigraphic units using the wireline signatures and outcrop study. In the second step, we have used statistical methods such as linear regression, fuzzy groups and theory of granularity to capture the relationship between the geological parameters and the well performances. In this step, we identified volume of clay (Vclay), hydrocarbon filled porosity (HCFP) and total organic carbon (TOC) as key drivers of the well performance. In the third step, we characterized the nine smaller units and identified four stratigraphic units as good reservoirs with two being the best due to their low Vclay, high HCFP and high TOC content.Finally, we reviewed the well paths of four horizontal wells with respect to the best stratigraphic units. We observed that production behavior of these wells is possibly driven by their lateral placement. The better producing wells are placed within the middle of the best stratigraphic units whereas the poor wells are going out the best stratigraphic units. This investigation provides a case study that demonstrates the importance of integrating datasets to identify best landing zones and the suggested workflow can be applied to other areas and reservoirs to better identify targetable zones.

Proppant Distribution in Newly Completed and Re-Fractured Wells - An Eagle Ford Shale Case Study

2021 ◽  
Author(s):  
Justin Allison ◽  
Glyn Roberts ◽  
Brad Hicks Hicks ◽  
Todd Lilly
Keyword(s):  
Oil And Gas ◽  
Treatment Effectiveness ◽  
Design Parameters ◽  
Distribution Analysis ◽  
Eagle Ford Shale ◽  
Eagle Ford ◽  
Video Footage ◽  
Final Consideration ◽  
Fractured Well

Abstract Fracture treatments and stage designs for new wells have evolved considerably over the past decade contributingto significant production growth. For example, in the acreage discussed hererecently used higher intensity fracturing methods provided an ~80% increase in recovery rates compared with legacy wells. Older wells completed originally with less efficient techniques can also benefit from these more up-to-date designs and treatments using re-fracturing methods. These offer the prospect of economically boosting production in appropriately selected wells. While adding in-fill wells has often been favored by Operators as a lowerrisk option the number of wells being re-fractured has grown every year for the last decade. In this case study two adjacent Eagle Ford wells, comprising a newly completed and a re-fractured well, allow both methods to be considered and compared. Completion design and fracture treatment effectiveness are evaluated using the uniformity of proppant distribution at cluster and stage level as the primary measure. Perforation erosion measurements from downhole video footage is used as the main diagnostic. Novel data acquisition methods combined with successful well preparation provided comprehensive and high-quality datasets. The subsequent proppant distribution analysis for the two wells provides the highest confidence results presented to date. Clear, repeatable trends in distribution are observed and these are compared across multiple stage designs for both the newly completed and re-fractured well. Variations in design parameters and how these effects distribution and ultimately recovery are discussed. These include changes to perforation count per cluster, cluster spacing, cluster count per stage, stage length, perforation charge size and treatment rates and volumes. As a final consideration production records for the evaluated wells are also discussed. Historical industry data shows that the number of wells being re-fractured increases relative to the number of newly drilled wells being completed during periods of low oil and gas prices. With the industry again facing harsh economic realities an increasing number of decisions will be made on whether new or refractured wells, or a combination of both, provide the best solution to replace otherwise inevitable production decline. This paper attempts to provide a detailed understanding of how proppant distribution, as a significant factor in production for hydraulically fractured wells, can be evaluated and considered in these decisions.

Volunteers for Anarchy: The International Group of the Durruti Column in the Spanish Civil War

2020 ◽  
pp. 002200942094992
Author(s):  
Morris Brodie
Keyword(s):  
Civil War ◽  
Spanish Civil War ◽  
Complex Nature ◽  
Melting Pot ◽  
International Group ◽  
Political Views ◽  
The Relationship ◽  
Hostile Attitude

This article explores the twin phenomena of anti-fascism and transnational war volunteering through a case study of the International Group of the Durruti Column in the Spanish Civil War. This anarchist-led unit comprised approximately 368 volunteers with a variety of political views from at least 25 different countries. The article examines the relationship between these foreign volunteers and their Spanish hosts (both anarchist and non-anarchist), through, firstly, the militarization of the militias in the winter of 1936, and, secondly, the group’s role in the May Days of 1937 and its aftermath. These episodes show the often hostile attitude of Spaniards to foreigners within Spain and challenge the characterization of the conflict as distinctively internationalist. The lives of these volunteers also highlight the continuity of anti-fascism between the interwar and wartime period, with Spain acting as an ‘anti-fascist melting pot’ where volunteers of different backgrounds and political leanings came together in a common cause. This commitment, however, was not unconditional, and was frequently challenged due to circumstances within Spain. Through studying these transnational fighters, we have a more comprehensive understanding of the complex nature of twentieth century anti-fascism.

Completion Optimization Under Constraints: An Eagle Ford Shale Case Study

2017 ◽  
Vol 32 (02) ◽  
pp. 128-136 ◽  
Author(s):  
Ikenna Okeahialam ◽  
Mei Yang ◽  
Dnyaneshwar B. Shinde ◽  
Vivek Sahai ◽  
Aura Araque-Martinez ◽  
...  
Keyword(s):  
Eagle Ford Shale ◽  
Eagle Ford ◽  
Optimization Under Constraints

scholarly journals Diversity in the relationship between low and upland society in mountainous Southeast Asia

Impact ◽  
2021 ◽  
Vol 2021 (3) ◽  
pp. 61-63
Author(s):  
Shinsuke Tomita
Keyword(s):  
Southeast Asia ◽  
Political Power ◽  
Agricultural Productivity ◽  
Associate Professor ◽  
Rice Farming ◽  
Area Of Interest ◽  
Key Drivers ◽  
The Relationship ◽  
Shed Light

The mountainous areas of mainland Southeast Asia have been an area of interest for researchers for decades. The mountains are located in a region that stretches out to the southern and western parts of China and encompasses different ethnic groups, forming a unique political, historical, social and cultural space. Associate Professor Shinsuke Tomita, Asian Satellite Campuses Institute, Nagoya University, Japan, is exploring the relationship between lowland and upland society in mountainous Southeast Asia, as well as investigating how agricultural productivity can be understood in the context of culture and society. In previous studies, researchers have surmised that interactions between the two societies are one of the key drivers behind the region's formation. An example of this is wet rice farming, which is regarded as the source of political power of the chieftains of the region due to its higher agricultural productivity. As such, researchers have been prompted to better understand the political power derived from wet rice farming and rethink lowland and upland relationships. From a case study in northern Laos, Tomita and the team shed light on relationships that cannot be explained by agricultural productivity. The researchers have also unearthed interesting findings relating to the power of the chieftain, including that the wet rice fields owned by the chieftain are not necessarily larger than other villagers and the power of the chieftain is likely unstable.

Shale play characteristics a case study of Eagle Ford shale

2013 ◽  
Author(s):  
Michael Smith ◽  
Gary Yu ◽  
Wei Yang ◽  
Marc Pottorf
Keyword(s):  
Eagle Ford Shale ◽  
Eagle Ford
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