Frequently Asked Questions

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.

If you are interested in this service, please fill out our Service Request Form, and we will get back to you promptly.

See also Digital Data | Log Interpretation