Development of an Enhanced Two-Phase Production System at the Geysers Geothermal Field Page: 3 of 10
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
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
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
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 November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.