ANALYSIS OF COMPOSITIONS OF FLOWBACK WATER FROM MARCELLUS SHALE WELLS BY UTILIZING DATAMINING TECHNIQUES

Open Access
Author:
Pan, Yuewei
Graduate Program:
Petroleum and Natural Gas Engineering
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
July 22, 2015
Committee Members:
  • Yilin Wang, Thesis Advisor
  • Eugene C Morgan, Thesis Advisor
  • Jeremy Michael Gernand, Thesis Advisor
Keywords:
  • Flowback Water Datamining
Abstract:
Water that is produced from shale gas wells in three months after stimulation treatments and shut-in periods is called flowback water. Volume and salt concentrations of flowback water depend on geology, drilling and completions, stimulation and flowback operations. Recent studies include evaluations of geochemical origins based on the compostition concentrations, flowback sampling analysis and numerical studies. However, an in-depth understanding of chemical compositions as well as the changes of compositions is still needed. In this work, we will firstly review the literature related to flowback in shale gas wells to fully understand the chemistry, geochemistry, and physics governing a fracture treatment, shut-in, and flowback. We will then gather all public and in-house flowback data, termed 3-week or 3-month flowback in this work, to build a flowback compositional database. After data screening, we will then analyze this compositional database which would potentially affect the wasterwater treatment design by using four different methods: geographical, changes over time, linear regression, clustering and multi-variable analysis. New understandings such as the magnitude and prevailing trends of concentrations for target constituents as well as the correlations among flowback compositions, the differentiation between early and late time flowback water were obtained and explained on the basis of geochemistry and physics.