Development of an Enhanced Two-Phase Production System at the Geysers Geothermal Field Page: 3 of 10
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Well B-6 was originally completed in 1977. It was completed as a steam producer and has been
on-line since 1986. The well benefited from injection into well
Figure 3. Area of Well B-6
0.07 ,'- 8i 12 -L23
N 6oMNt 3I156
4J\" 15321 0 P
Q3 ~- B3 97
03 - 0.02
82 * E4
0 Scale in Feet 2000 0.1 00
Cumulative Recovery of R-23 Tracer (in Pounds)
Day 56 following August 18, 1998 Injection
P-1 that started in early 1998. A tracer test conducted on well P1 in 1998 indicated that a
significant amount of the injection derived steam was being produced by many of the off-set
steam wells, including B-6, as shown in Figure 3. Because of the beneficial response to injection
in well P-1, it was not an option to redistribute injectate to another well once water breakthrough
occurred into B-6. Therefore an alternative well completion into well B-6 was installed during a
rig workover, August - October 2000 which allowed for enhanced geothermal steam production.
Steam production at The Geysers typically occurs from wells that are completed with an open-
hole interval below cemented casing. Well diameters within the open-hole completion interval
typically range between 8.75 and 12.25 inches. Depths of the steam entries can range between
2,500 and 10,000+ feet with multiple steam and/or water entries per well. The wells and
production surface equipment are designed for single-phase steam production at a backpressure
that is controlled by the power plant operations and by the gathering system mechanics.
Typically this pressure is 90 to 120 psig. Well B-6, the test well, is shown on Figure 1.
When injected water breaks through to a steam well, the water reduces steam flow and requires
that special water-handling separators be placed on the wellhead. If the steam has sufficient
velocity to lift the water from the well bore, the water is produced as a two-phase mixture to the
surface. But more often the steam has insufficient velocity to effectively lift the water out of the
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Enedy, Steven. Development of an Enhanced Two-Phase Production System at the Geysers Geothermal Field, report, December 14, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc719556/m1/3/: accessed January 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.