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The GR/CCL run serves the purpose of a drift run, thus givingthe 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.

This is the use of high-pressure explosives jets form to shoot holes through the casing, cement, and production formation. Clean perforation tunnels with flow-friendly surface areas provide the optimalhydrocarbon pathways.

The CBL tool uses the theory of acoustics (i.e. sound), where the tool emits sound at a specific frequency from it transmitters and this reflects off the casing using a principle based on resonance. Casing not bound has a higher resonant vibration than that which is bound. The amplitude of the waveform, received by the tool's receivers, is the basic measurement that is evaluated.

Differential pressure is the difference between the pressure above the cement and the pressure below the cement.

There are numerous ways a cable or tool may get stuck in a well during both cased hole and open hole logging operations. In cased hole work it is most commonly, but not always, the tool that is stuck. In open hole operations, there is always the problem of the cable becoming key-seated in the bore hole wall. In cased hole operations, tools can become stuck due to D.V. tools, sidetracks or casing windows, sand or debris in the wellbore, severe doglegs or horizontal sections and collapsed casing. In an open hole well it is possible for the logging tools, or wireline to become stuck many feet above the tool. This is usually referred to as being “differentially stuck”. This phenomenon can occur when there is higher pressure in the well bore than the formation which can force the logging cable and/or logging tool into the thick mud cake that has built up on the bore hole wall. Continued attempts to withdraw cable from a cable that is stuck can result in frictional forces so great that cable tension exceeds allowable limits. Another circumstance that can occur in open hole operations is Key Seating of a wireline in the well bore wall. Because oil & gas wells are not drilled perfectly straight, dog legs can cause points of friction on the wireline as it is pulled out of the well. As the cable is drawn out of the well during logging operations it can wear a slot into the formation. When a logging tool reaches the slot it stops because the diameter of the slot is much too small for the logging tool to pass through. In many instances the logging tool will be free to go down hole, but it cannot be pulled up past the dog leg in the well.

When a cable becomes stuck and will not move at the recommended maximum allowable tension, then the rst step in deciding what action to take is to determine where the cable is stuck. If the logging cable is stuck above the logging tool, it will be impossible to part the weak link in the cable head and the only way to free the logging truck from the stuck point will be to pull the wireline until complete failure. Before making any determination about pulling out of the weak point in either open or cased hole operations, it is critical to understand where the wireline has become stuck.