|
Seasoning Cable
Recommendations
Manual Menu
|
Seasoning a New Well Logging Cable
Recommendations for Insuring
Proper Seasoning and Long Cable Life
Practice of the following
recommendations will help insure proper seasoning and a long life to a logging
cable:
- Plan for the appropriate jobs for
the seasoning runs of a cable.
- If possible, season the cable in a
test well. The ideal test well exceeds typical working depths, is vertical,
has no wellhead pressure, and contains fluid, preferably water.
- The seasoning process should be used
anytime an unused portion of the length is run in the well. The most
important run is the first.
- Use the seasoning process until the
permanent stretch and permanent rotation are complete, and until the armor
layers become fixed or "locked" together.
- Maintain cable tension according to
the 80/120 rule. Operate at such a speed that, at all depths, downhole
tensions are at least 80% of static tension, and uphole tensions are no more
than 120% of static tension. Remember, think tension, and speed controls
tension.
- Do not exceed a tension of 50% of
the cable's fixed ends break strength.
- Use of a larger weight at the
cablehead is advantageous. Running tools that weigh up to 10% of the break
strength of the cable is acceptable.
- If possible, avoid jobs requiring
use of the grease head or hydraulic packoff. If they must be used, use as
large a flow tube ID as possible while still maintaining a pressure seal.
Use worn rubber elements in the packoff. Do not use the packoff while going
downhole, and use absolute minimum force while coming out of the well. It is
preferable to not use over the line fluid applicators, for applying
corrosion inhibitors. These are the tube type with rubber seals at each end.
- Operate such that the cable rotates
freely. Give the cable time to rotate. Reversing direction for a short
distance aids rotation. "Yo-yo" the cable to bottom in the first
trips by running down 1000 ft, then back up 100, down 1000 ft, back up 100
ft, etc., all the way to bottom. Avoid deviated wells if possible. Avoid use
of caliper type instruments that prevent rotation, if possible. Use of
swivel joints between the cable and logging tool is recommended.
- Do not attempt to perform azimuth
direction type surveys on the first few runs, because of the large amount of
rotation the end of the cable will experience. Dipmeter log is one example.
- If the new cable or tool becomes
stuck while working with pressure control equipment, do not "work"
the cable, or make repeated pulls at high tension to unseat the cable or
tool. Doing so can concentrate loose outer armor above the packoff, which
causes the cable to lose strength. Outer armor looseness can accumulate at
the end of the short section of cable which stretches as the cable cycles
through the grease head and across the sheave(s).
- In a cased hole environment, the CCL
can sometimes be used to monitor rotation. Stop the hoist and monitor the
CCL signal while increasing its sensitivity. A changing signal can indicate
tool rotation. Remain stopped for a minute or two until the CCL signal
stabilizes. This will help assure that the cable has "spun out and come
to torque equilibrium while going in and out of the well.
- If severe logging conditions are
encountered, or a possible cable problem is observed during seasoning, have
the cable inspected at a qualified service center immediately after the job.
- Please contact Camesa, Inc. in
Rosenberg, TX at phone (800) 866-0001 or (281) 342-4494 or fax (281)
342-0531 if you have any question regarding seasoning a new logging cable,
or any other cable question.
Please contact Camesa, Inc. in
Rosenberg, TX at phone (800) 866-0001 or (281) 342-4494 or fax (281)
342-0531 if you have any question regarding seasoning a new logging cable,
or any other cable question.
Previous Page
| Print Page
|
