West Hackberry Tertiary Project. Quarterly technical progress report, March 3, 1995--June 2, 1995 Page: 4 of 18
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between the Watkins No.18 and the Watkins No.16. A revised structure map for the top
of the Cam C-1 sand(which displays the newly interpreted fault) is included as an
Assuming a 50% gas saturation and a 6 acre area from the Watkins No.16 downstructure
to the Gulf Land D No.56, the air would have flooded an average of only five feet to have
reached the Gulf Land D No.56. After just a few days of flowing gas at low rates during
daylight hours from the Gulf Land D No.56, the well loaded up with salt water. The Gulf
Land D No.56 was subsequently placed on gas lift and has averaged 300-400 BWPD with
a 1% oil cut and no further evidence of nitrogen production. Ed Turek, research engineer
at Amoco's Tulsa Research Center, will history match the performance thus far of the
Watkins No.16 and Gulf Land D No.56 to determine what magnitude of permeability
difference is necessary to cause the early nitrogen breakthrough. Utilizing this
information, Ed Turek will plug in the permeability difference into the prediction of
future performance for the area surrounding the Gulf Land D No.51(air injector) in Fault
Although no conventional cores exist in this area of the field, sidewall cores were taken in
many of the wells during the 1950's. No permeability measurements were run on these
1950's vintage sidewall cores. A review of the sand description indicates that while
much of the Cam C-1,2,3 Sand is fine to very fine grain, the upper portion of the Cam C-
1 Sand possesses some medium to coarse grain sand. A log section for the Watkins
No.16 with sidewall core descriptions is included as an attachment. Differences in grain
size can account for permeability variations, with larger grain sand usually possessing
greater permeability. The medium to coarse grain sand found in the upper portion of the
Cam C-1 Sand is suspected of being the source of the premature nitrogen breakthrough in
the Gulf Land D No.56.
Current plans are to pull the Watkins No.16, isolate the upper portion of the Cam C-1
Sand with isolation packers and resume injection into the remainder of the Cam C-1,2,3.
Sand. In addition, recompleting the Watkins No.3(upstructure to the Watkins No. 16)
from the Bol-3 Sand to the Cam C-1 Sand is being evaluated. The purpose of
recompleting and testing the Watkins No.3 in the Cam C-1 would be to confirm the
revised geologic picture.
2)Corrosion Downhole in the Air Injectors and at the Wellsite Injection Skid
On March 27, 1995, the Watkins No.16(air injector) developed pressure communication
between the tubing and the tubing/casing annulus. Air injection into the Watkins No.16
was immediately stopped due to concerns regarding corrosion and casing integrity. While
the Watkins No.16 was shut in, the entirety of the compressed air stream was injected
into the Gulf Land D No.51 until the Gulf Land D No.51 also developed pressure
communication between the tubing and the tubing/casing annulus and it was also shut in.
The suspected cause of the communication in both air injectors is corrosion resulting
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Gillham, T.; Cerveny, B. & Turek, E. West Hackberry Tertiary Project. Quarterly technical progress report, March 3, 1995--June 2, 1995, report, May 31, 1995; United States. (https://digital.library.unt.edu/ark:/67531/metadc784816/m1/4/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.