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- Is there any need to run a GR/CCL log prior to
Perforation?
- Does the radioactive pill bar that is run in the
long string, when perforating a short, have any
associated risk if if lost in hole?
- Can the cement used in Through-tubing plugback
hold differential pressure?
- What is differential pressure?
- Apart from corrosion evaluation, can the MFI
detect leaks and holes in tubings?
- What is the mode of operation of the MFI?
- Do you have TTPB plugs with two slips below the
petal basket?
- For plugs with double basket, is the lower
one inverted or not?
- If not inverted, does the lower basket contain
pre-packed ceramic beads?
Question: Is there any need to run a GR/CCL log prior to Perforation?
Answer: The GR/CCL run serves the purpose of a drift run, thus giving
the operator an idea of the nature of the casing, so that you don't encounter
obstructions when you run in hole with a live gun. It is always better
to correlate the CCL, during the gun run, to the GR/CCL log, so that any
mistakes, such as off-depth perforations in previous jobs, will not be inherited.
Question: Does the radioactive pill bar that is run in the long string,
when perforating a short, have any associated risk if lost in hole?
Answer: The radioactive pill bar comprises only about 1/10th of the
power of the open hole logging source - about 2 Cu, and it can easily
be fished out of hole.
Question: Can the cement used in Through-tubing plugback hold
differential pressure?
Answer: The cement consists of a unique mix, which is designed to bond well
with the walls of the casing, thereby holding enough differential pressure.
Question: What is Differential Pressure?
Answer: Differential pressure is the difference between the pressure
above the cement and the pressure below the cement.
Question: Apart from corrosion evaluation, can the MFI detect
leaks and holes in tubings?
Answer: Oildata's Multi-Finger Imaging tool provides the Petroleum, Drilling
and Corrosion Engineer, data for the following applications:
- Casing Deformation
- Casing Wear Measurement
- Corrosion Assessment
- Location of holes, cracks and splits
- Perforation Mapping
- Scale Evaluation
Question: What is the mode of operation of the MFI?
Answer: The Multi-Finger Imaging tool has an array of hard-surfaced
fingers (24), which measure small changes in tubing/casing diameter.
The individual finger measurements can be transmitted real time to
surface, or stored in a downhole electronic memory tool for
subsequent analysis.
Question: Do you have TTPB plugs with two slips below the petal basket?
Answer: No, the petal basket plugs do not have two slips below the
basket, they have only one.
Question: For plugs with double basket, is the lower one inverted or not?
Answer: Yes, the lower basket in the X-flow double basket plug is inverted.
Question: If not inverted, does the lower basket contain pre-packed ceramic beads?
Answer: No. However, the double basket plugs also do have ceramic
shots loaded. The shots are loaded in a carrier tube on top of the double basket.
There is only one set of slips on the top of this type of plug.
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