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Types of Perforation Systems?

Types of Perforation Systems?

Types of Perforation Systems

Three perforation systems which are used in oil and gas industry are casing guns, tubing conveyed guns and through tubing guns.

Casing Gun System (Wireline Convey)

The casing gun system is the oldest perforation technique and it involves running perforation in order to perforate a well before running a completion. Wellbore conditions can be either overbalanced or underbalanced when perforating. Additionally, a wellbore should be neutralized before running the completion because it will minimize formation damage.

Some advantages of a casing gun are listed below;

Perforation guns can be run with wireline or electric line in order to get an accurate depth control

Larger diameter guns can be utilized.

Effective well control

Operations are mechanically simple and reliable

Some disadvantages of casing gun are listed below;

Takes rig time for perforation

Requires rig up equipment on the rig floor

Tubing Conveyed Perforation System (TCP)

For this system, the perforation gun is attached and run with a completion string. This system requires drilling an additional hole called a “sump” in order to accommodate a perforated gun to be dropped and left in the well after a gun is fired.

Some advantages of tubing conveyed technique are listed below;

Long reservoir interval can be perforated by one run

Larger explosion charges than through tubing system

Perforation can be done within the underbalanced condition so formation damage can be minimized.

Significant reduction in rig time

Disadvantage of tubing conveyed technique are listed below;

Take a long time before perforation charges will be fired

Through Tubing System

Through tubing perforation allows perforation to be performed with the existing completion string. This system has limitations on size of charge and perforation gun because the guns must be small enough to run into a completion string. Typically, the gun size is smaller than 2-1/8.”

Advantages of through tubing system are as follows;

Perforate a well with a completion string

Rapid deployment and retrieval by using wireline or electric line units

Minimizes loss of production

Accurate depth control

Reduced cost because no completion retrieval is required

Disadvantages of through tubing system are as follows;

Smaller diameter of perforation charges can be used when compared to other perforation system. Therefore, deep of penetration is shallower than others.

Length of perforation in one run is limited by surface equipment.

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Post time: Jan-03-2024