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2012-12-12_REVISION - P2010026 (3)
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2012-12-12_REVISION - P2010026 (3)
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Last modified
6/15/2021 11:33:58 AM
Creation date
12/12/2012 4:40:08 PM
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Template:
DRMS Permit Index
Permit No
P2010026
IBM Index Class Name
REVISION
Doc Date
12/12/2012
Doc Name
NOI MODIFICATION
From
OPERATOR
To
DRMS
Type & Sequence
MD3
Email Name
THM
GRM
Media Type
D
Archive
No
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a soda ash zone near the location of the heater, (4) a lower soda ash /nahcolite transition zone, and <br />finally (5) a second virgin nahcolitic zone below the heated interval. Shell proposes to conduct lab <br />testing on the core to map the location of the transition zones using the temperature fields from the <br />reservoir model to establish the temperatures at which in situ conversion of the nahcolite to soda <br />ash occurs. Shell further proposes to leach representative portions of the core in (1) the virgin <br />nahcolitic zone, (2) the nahcolite /soda ash transition zone, and (3) the soda ash zone to determine <br />the impact of heating on sodium recovery. Core previously cut from nearby wells (but never heated) <br />can also be used in the study.' <br />Because of the very low nahcolite content near Heater 2 and Heater 3, no investigation on the <br />impact that heating will have on sodium recovery is necessary and none is planned. <br />5.2.3 Pyrolysis and Production <br />Pyrolysis facilities will consist of the three heater wells, each equipped with an electric heater <br />installed in a canister to heat the formation which will convert the in -situ kerogen adjacent to the <br />heater into oil and gas. Each heater will be installed with temperature monitoring instrumentation. <br />An inclined observer /producer well will be installed through the heated interval near the heater wells <br />to provide additional pressure relief to the formation during heating. <br />During the heating process water (generated by the decomposition of nahcolite to soda ash), oil and <br />gas are released from the kerogen and surrounding matrix increasing the subsurface pyrolysis <br />interval pressure. To maintain the pressure in the pyrolysis intervals below the formation fracturing <br />pressure, pressure will be bled from the formation by the heater wells and the observer /producer <br />well. To remove liquids from the pyrolysis interval, an artificial lift system will be installed in the <br />inclined observer /producer well. Any production from the heater or observer /producer wells will <br />flow through piping connecting the well heads to a separator located at the EAST RDD pilot. <br />Produced gases will be flared, and the oil and water will be recovered from the separator and trucked <br />off site. Diluent and makeup water obtained from the City of Meeker may be added to the <br />production stream, the well casing, or well tubing (if needed) to assist in the production of bitumen <br />which will form during the lower temperature phases of pyrolysis. Produced CO, and other non- <br />combustible gases will be included in the stream of gas sent to the flare. <br />The heating phase of ELHT is expected to last for two or more years and is expected to run <br />concurrently with heating at the East RDD Pilot. <br />5.2.4 Subsurface Reclamation Plan <br />Full details of subsurface reclamation are described in the Subsurface Reclamation Plan Section of <br />this NOI Modification. A synopsis of activities for the ELHT follows. <br />Upon completion of the heater test, the pyrolyzed zones will be allowed to cool naturally. Natural <br />cooling will be considered complete when the temperature at the heater wells falls below —200 °F <br />(i.e., boiling point of water at reservoir conditions). Once below —200 °F, any subsurface equipment <br />1 *Reference 135 -4- 298 -SAW1 well. <br />5 <br />
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