What does formation damage mean?

Formation damage is a condition most commonly caused by wellbore fluids used during drilling, completion and workover operations. It impairs the permeability of reservoir rocks, thereby reducing the natural productivity of reservoirs.

What is wellbore?

A wellbore is a hole that is drilled to aid in the exploration and recovery of natural resources, including oil, gas, or water. A wellbore is the actual hole that forms the well. A wellbore can be encased by materials such as steel and cement, or it may be uncased.

What is mechanical skin damage?

The reduction in permeability in the near-wellbore area resulting from mechanical factors such as the displacement of debris that plugs the perforations or formation matrix. Such damage in the near-wellbore area can have a significant effect on the productivity of a well. See: skin.

What are the three components of wellbore skin?

Therefore, total skin is discretized in three components: non-Darcy, geomechanical and mechanical formation damages.

What is formation damage in a wellbore called?

Typically, any unintended impedance to the flow of fluids into or out of a wellbore is referred to as formation damage.

Which is the correct definition of a wellbore?

A wellbore is usually a straight vertical shaft that “bores” into the ground to allow the recovery of natural resources. It also includes the open hole and uncased portions of the well. The following is a diagram of an oil wellbore encased in steel and cement. The wellbore is the actual drilled hole.

What does a damaged zone in a well mean?

Damaged Zone. Definition – What does Damaged Zone mean? A Damaged Zone is an area inside a reservoir that surrounds the wellbore. This area creates certain resistance to the smooth flow of hydrocarbons into the wellbore thereby affecting the productivity of the well.

When does the wellbore storage effect take place?

Wellbore Storage The wellbore storage effect is defined immediately after a production start-up or shut-in, when the pressure behaviour at early times is dominated by the compressibility and volume of the wellbore fluid. At the start of a flow period, production at surface is due to the expansion of the fluid in the wellbore, and not the reservoir.