Simulation Study Of The LETC TS-2C In Situ Combustion Test In Utah Tar Sands

1979 ◽  
Author(s):  
Harold L. Hutchinson ◽  
Allan Spivak ◽  
Lyle A. Johnson
Keyword(s):  
Simulation Study ◽  
In Situ Combustion ◽  
Tar Sands

Reverse Combustion Instabilities in Tar Sands and Coal

1980 ◽  
Vol 20 (04) ◽  
pp. 267-277 ◽  
Author(s):  
Robert D. Gunn ◽  
William B. Krantz
Keyword(s):  
Reaction Zone ◽  
Combustion Front ◽  
Stability Theory ◽  
Coal Gasification ◽  
Gas Production ◽  
Volatile Components ◽  
In Situ Combustion ◽  
Tar Sands ◽  
Vertical Well

Abstract A linear stability analysis shows that reverse combustion in coal and tar sands is only conditionally stable for mobility ratios less than one. However, high air-flow rates and gas generation at the combustion front can be stabilizing influences. For unstable operation, an estimate of the size of the reverse combustion channel may be obtained from the curve for the most highly amplified wave length. This provides a method for calculating the air flux, combustion front velocity, and rate of progress of the burn front. Recently the U.S. DOE Laramie Energy Technology Center (LETC) and Sandia Laboratories obtained experimental data about reverse combustion from a field test of in-situ coal gasification at Hanna, WY. These data show that 9.7 days were required for the development of a reverse combustion path 68 to 70 ft in length. The stability theory developed in this work predicts a length of 64 ft for this same 9.7-day period. In addition to quantitative predictions, stability theory provides an explanation of certain puzzling qualitative observations concerning reverse combustion. Introduction In-situ combustion is a potentially useful method for recovering fossil fuels from underground deposits. A number of in-situ combustion field tests have been conducted in oil reservoirs, tar sands, oil shale deposits, and coal seams. In-situ combustion can be classified into two broad categories: reverse combustion, in which the reaction front travels countercurrent to the flow of air, and forward combustion, in which the reaction zone travels in the same direction as the flow of air. Reverse combustion is especially important for coal and tar sands. During forward combustion, tars vaporized at the flame front in either coal or tar sands travel by convection into cooler regions ahead of the reaction zone where they condense and subsequently reduce the natural permeability of the fuel bed. In reverse combustion, vaporized tars or other high-molecular-weight compounds generated in the reaction zone travel toward the production well through a heated area already contacted by the high temperatures of the combustion front. As an added advantage, reverse combustion in tar sands substantially increases the relative permeability to gas. In lignite and subbituminous coal, drying and partial combustion typically increase the effective permeability to gas by four orders of magnitude. However, bituminous coal frequently swells on heating, and the net effect of reverse combustion on the permeability of swelling coals has not been investigated thoroughly. In coal and tar sands, reverse combustion is primarily a coking or carbonization process - i.e., the volatile components of the tar or coal are partially combusted while most of the carbon or coke is left unburned. For these reasons, reverse combustion represents an important part of some in-situ combustion methods currently being investigated for tar sands and coal. In the linked vertical well process for in-situ coal gasification, reverse combustion is used first to develop a high-permeability path between the production and air injection wells, while in the second stage of the process forward gasification or combustion is used as the major gas production method. Both industrial companies and government laboratories have investigated the linked vertical well process. For tar sands, the LETC is considering the use of reverse combustion as a preparatory mechanism similar to that used in coal.

Simulation Study for Designing an In-Situ Combustion Pilot in the Orinoco Belt of Venezuela: From Laboratory Studies to the Field Scale

2010 ◽  
Author(s):  
Ismael Anaya ◽  
Rosa Elena La Cruz ◽  
Argenis Jesus Alvarez ◽  
Dubert Gutierrez ◽  
Fraser A. Skoreyko ◽  
...  
Keyword(s):  
Simulation Study ◽  
Laboratory Studies ◽  
Field Scale ◽  
In Situ Combustion

scholarly journals Investigation on a wet oxidation of crude oil for simulation study of super-wet in-situ combustion as an EOR.

2003 ◽  
Vol 68 (4) ◽  
pp. 282-290
Author(s):  
Yasuhide Sakamoto ◽  
Yuichi Sugai ◽  
Fangming Jin ◽  
Heiji Enomoto ◽  
Chengxie Hong
Keyword(s):  
Crude Oil ◽  
Simulation Study ◽  
Wet Oxidation ◽  
In Situ Combustion

scholarly journals Simulation study of oil recovery by in-situ combustion.

1981 ◽  
Vol 24 (6) ◽  
pp. 378-384
Author(s):  
Seiichi HIRAKAWA ◽  
Nobuyoshi FUKUSHIMA
Keyword(s):  
Oil Recovery ◽  
Simulation Study ◽  
In Situ Combustion

ROCK OIL RESERVOIR STRUCTURE INFLUENCE ON THE FLAME STABILITY OF THE IN-SITU COMBUSTION RECOVERY METHOD

2019 ◽  
Author(s):  
Lucas Henrique Pagoto Deoclecio ◽  
Filipe Arthur Firmino Monhol ◽  
Antônio Carlos Barbosa Zancanella
Keyword(s):  
Flame Stability ◽  
Oil Reservoir ◽  
In Situ Combustion ◽  
Recovery Method
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