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Title: September 2016 Bayou Choctaw Subsidence Report

Abstract

Subsidence monitoring is a crucial component to understanding cavern integrity of salt storage caverns. This report looks at historical and current data at the Bayou Choctaw Strategic Petroleum Reserve Site. Data from the most recent land-based annual surveys, GPS, and tiltmeter indicate the subsidence rates across the site are approximately 0.0 ft./yr. Because of this, there is no evidence from the subsidence survey to suggest any of the DOE caverns have been structurally compromised.

Authors:
 [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE), Petroleum Reserves (FE-40)
OSTI Identifier:
1367448
Report Number(s):
SAND2017-5688R
653691
DOE Contract Number:
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Moriarty, Dylan Michael, and Lord, Anna C. Snider. September 2016 Bayou Choctaw Subsidence Report. United States: N. p., 2017. Web. doi:10.2172/1367448.
Moriarty, Dylan Michael, & Lord, Anna C. Snider. September 2016 Bayou Choctaw Subsidence Report. United States. doi:10.2172/1367448.
Moriarty, Dylan Michael, and Lord, Anna C. Snider. Mon . "September 2016 Bayou Choctaw Subsidence Report". United States. doi:10.2172/1367448. https://www.osti.gov/servlets/purl/1367448.
@article{osti_1367448,
title = {September 2016 Bayou Choctaw Subsidence Report},
author = {Moriarty, Dylan Michael and Lord, Anna C. Snider},
abstractNote = {Subsidence monitoring is a crucial component to understanding cavern integrity of salt storage caverns. This report looks at historical and current data at the Bayou Choctaw Strategic Petroleum Reserve Site. Data from the most recent land-based annual surveys, GPS, and tiltmeter indicate the subsidence rates across the site are approximately 0.0 ft./yr. Because of this, there is no evidence from the subsidence survey to suggest any of the DOE caverns have been structurally compromised.},
doi = {10.2172/1367448},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}

Technical Report:

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  • The findings and results of the Strategic Petroleum Reserve (SPR) Conceptual Design are summarized. The main body of the report includes a master schedule for design, construction, leaching and filling, process and piping system description, cavern design and leaching analysis, electrical and instrumentation systems description, list of long lead equipment and a cost estimate.
  • In March 1982, Sandia National Laboratories (SNL) conducted a pressurization experiment in a salt dome at the Bayou Choctaw facility near Baton Rouge, LA. Three, three-axis geophones were installed to monitor the acoustic emission activity produced by the pressurization cycle. Difficulties with cultural and environmental noise produced many alarms (800). No acoustic emission events were identified. The downhole package produced resonances that distorted the signals. As a result, if any events had been identified, this difficulty would have precluded quantitative determination of locations and magnitudes. 8 references, 21 figures, 6 tables.
  • Stress and temperature change tests are described to determine upper and lower bound of the rates of steady state creep for three domal salts. Results obtained are compared with published data for salt from the same sites and with two larger data sets for a bedded salt. The various data sets are then correlated in activation analyses and fitted by models for power-law creep, cross-slip, and dislocation glide to show that a cross-slip model yields the best and mechanistically most credible fit. This suggestion is consistent with limited substructure observations for one sample. No satisfactory fit was obtained for amore » two-mechanism model dislocation climb and cross-slip. Results described include stress drop measurements that demonstrate slow recovery. It remains to be proved if recovery of rock salt at low temperature will be complete, and if so, after how much strain. Although all creep data are described most satisfactorily in terms of cross-slip, power-law models continue to be good empirical approximations. Therefore, the further use of power-law creep equations to describe the steady state creep of rock salt in SPR design calculations is deemed justified. 58 references, 15 figures, 3 tables.« less
  • Transmission of microwave power at frequencies from 1 to 11 GHz has been observed through a short, slotted, coaxial line filled with crude oil from each of five wellhead samples collected at Bayou Choctaw (BC) and one sample from a West Hackberry cavern (WH105). An accurate model for the filled slotted line is used to derive the dielectric constant and loss tangent for each oil. The highest loss occurs in oil from BC19 whose loss tangent is 0.0103 at 1 GHz; the lowest, in WH105 whose loss tangent at 1 GHz is 0.0026. These data suggest favorable prospects for high-resolutionmore » radar mapping of SPR cavern walls. Sulphur compounds in the oil appear to be the major source of the microwave attenuation. 20 refs., 4 tabs.« less