Commercial production of ethanol in the San Luis Valley, Colorado. Final Report Page: 56 of 222
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interpreted by an expert or the derived production index of the well will be wrong. In
some cases an intermediate easing string is already cemented in place to a point just
above the region'to be tested. This allows the expandable packer assembly to be set in
existing casing so that well caving around the drill stem test tool is not a problem.
This will conclude the phase of testing completed prior to the completion of
the well. At this time the production testing phase' of the well test program begins.
The production testing phase can be divided into two separate tests, the initial cleanout
or pit test and a long-term (30 day) production test.
The initial cleanout test involves producing the well into the drill cuttings
pit. The duration of the test depends upon the volume of the cuttings pit, but generally
runs around 12 hohrs. 'The primary purpose 'of this test, as the name indicates, is to
clean-residual drilling tmud, drill cuttings and debris from the wellbore and producing
formation. It is 'essential that this cleanout take place soon after the well has been
completed as otherwise' irrepairable formation damage could result. It is often neces-
sary to have a nitrogen (or air) pump truck onsite to bring in the well by artificial gas
lift as reservoir pressure may not be sufficient to overcome the fluid pressure head
generated by the column of heavy fluid remaining in the hole. During the well cleanout
operation, preliminary 'data can be 'obtained on well productivity and temperature.
However, this flow period is hot long enough to accurately characterize the well.
After completion of the initial well cleanout operation, preparations can be
made for the long-term production test. The most important consideration involved in
planning a 30-day production test concerns the question of fluid disposal. In the San
Luis Valley, the only acceptable method of fluid disposal will involve injection back into
the subsurface -reservoir. Therefore, a suitable injection well will have to be drilled and
completed before a long-term production test can be run.
"When a suitable 'injection' well has been completed and surface piping
between the wells and an injection pump have been installed, the production test can be
Prior to the start of the test the static well pressure should be monitored
for several days (or until the pressure has stabilized). Then geothermal fluid will be
produced and injected for a 30-day test period. During this test period, the following
data shall be recorded:
a) 'surface temperature - production well
b) Surface'temperature -injection well
c) Surface pressure - production well
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Hewlett, E.M.; Erickson, M.V.; Ferguson, C.D.; Sherwood, P.B.; Boswell, B.S.; Walter, K.M. et al. Commercial production of ethanol in the San Luis Valley, Colorado. Final Report, report, July 1, 1983; United States. (digital.library.unt.edu/ark:/67531/metadc874948/m1/56/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.