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Use of a New Analytical Model To Match Production Data and Identify Opportunities To Maximize Well Productivity in the Tuscaloosa Marine Shale Reservoir

Authors
Boyun Guo (University of Louisiana, Lafayette) | Xu Yang (University of Louisiana, Lafayette)
DOI
https://doi.org/10.2118/198892-PA
Document ID
SPE-198892-PA
Publisher
Society of Petroleum Engineers
Source
SPE Production & Operations
Volume
34
Issue
04
Publication Date
November 2019
Document Type
Journal Paper
Pages
770 - 780
Language
English
ISSN
1930-1855
Copyright
2019.Society of Petroleum Engineers
Disciplines
Keywords
production, oil, shale, TMS, fracturing
Downloads
16 in the last 30 days
60 since 2007
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Summary

The low productivity of the oil wells in the Tuscaloosa Marine Shale (TMS) Trend, located in Louisiana and Mississippi, is a mystery. Production data from 55 wells in the TMS Trend were analyzed to identify possible means of enhancing well productivity. The -1/2 slope in a log-log plot for reservoir linear flow (RLF) was observed for some wells, but not all, and the -1 slope for boundarydominated flow (BDF) has not been seen in the past 5 years of production. The behavior of the TMS wells is attributed to the ultralow permeability of the TMS matrix and the decline of fracture conductivity, both of which delay the BDF. On the basis of the concept of the distance of investigation, derived from the radius-of-investigation concept, the matrix permeability of the seven TMS wells was estimated to be between 34 and 65 nd, with an average of 51 nd. A new mathematical model for production decline of multifractured horizontal wells was developed taking into consideration the time-dependent fracture conductivity during the BDF period. This model fits TMS-well production data, with an average error of 6.12% and an R2 value of 0.96. Assuming constant matrix permeability, fitting the new model to the production data in the BDF period gives a rate of fracture-conductivity decline of between 0.20 and 0.74% per month. The new mathematical model reveals opportunities to optimize well completion to enhance well productivity in the TMS Trend. For a given amount of fracture proppant allocated to a well, the shortest possible fracture spacing should be used to maximize well productivity. If the number of fractures is fixed as a constraint of well completion design, well productivity is inversely proportional to the square root of fracture spacing (i.e., if the fracture spacing is shortened by fourfold, well productivity is expected to double). If the horizontal wellbore length is fixed as a constraint of well completion, well productivity is inversely proportional to fracture spacing (i.e., if the fracture spacing is shortened by 50%, well productivity is expected to double).

File Size  527 KBNumber of Pages   11

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