Luis Montalvo Lliteras
Years participated in RESESS:
Academic Affiliation: University of Puerto Rico at Mayagüez
Science Research Mentors: David Velez, Shell Oil & Kelly Hutchings, Shell Oil
Luis G. Montalvo Lliteras is a native of Puerto Rico and grew up in the southwest coast of the island in a town called Cabo Rojo. His academic interests are in carbonate sedimentology, diagenesis, dolomitization and the effects of sea level changes throughout geologic time. During the summer of 2011, Luis participated in a joint internship between RESESS and Shell Western Exploration and Production (SWEPI LP), working in Houston, TX. This was an exciting new experience for him in which he worked with many geologists and engineers on analyzing the distribution of hazardous drilling events in shales using mud logs and drilling reports for an area in northwestern Louisiana. Luis loves hiking, camping, and snorkeling. He creates music beats and complete tracks using various music software programs, and sometimes works as a d.j. in night clubs.
Evaluation of drilling events in the Haynesville and Bossier Shale, Magnolia, NW Louisiana
The Magnolia field in NW Louisiana has been a potential target for the drilling of gas wells by Shell Exploration and Production and Encana since 2007. Data taken from drilling reports and mudlogs was used to create geohazard maps for the Haynesville and Bossier shales in the Magnolia AMI (area of mutual interest). Three types of drilling events were identified: gas shows (circles in figure), circulation loss (crosses in figure) and failed Formation Integrity Test (LOT) (crosses in figure). An evaluation was done using reports and mudlogs to explain the genesis of each of these events in two categories: lithology related or fracture related events (includes faults). Using the software, Schlumberger Petrel 2009.2, well sections were used to plot the stratigraphic location of these events, and geohazard maps were generated to analyze their aerial distributions. Correlation of events was possible in some areas and three hazard zones were found in the Lower Bossier stratigraphic layer. The Lower Bossier is the stratigraphic interval with the largest amount of gas shows due to a slight change in permeability making it easier to expel gas while drilling. This is consistent with the estimated amount of generated gas found on the Lower Bossier by other studies. The Upper Bossier is the depth at which the larger amount of circulation losses was detected. Fewer events where found at the Haynesville, which is the present target for gas production. Geohazard maps were developed and compared with data for Estimated Ultimate Recoveries (EUR) to correlate drilling events with the production of Shell and Encana wells. No correlation is found because gas shows are happening on nonproducing intervals and the amount of gas shows can be affected by drilling parameters.