What is reservoir skin?

It is a zone of reduced permeability within the vicinity of the wellbore (skin) as a result of foreign-fluid invasion into the reservoir rock.

What is skin factor in reservoir engineering?

Skin Factor is usually defined to account for additional pressure drop due to damage or stimulation around the wellbore in an oil / gas formation. The positive skin may be caused by such phenomena as mud and cement infiltration, wax/asphaltene deposition, connate water vaporization, etc.

What is skin factor in petroleum engineering?

1. n. [Well Testing] A numerical value used to analytically model the difference from the pressure drop predicted by Darcy’s law due to skin. Typical values for the skin factor range from -6 for an infinite-conductivity massive hydraulic fracture to more than 100 for a poorly executed gravel pack.

What is skin factor effect?

The skin factor does affect the shape of the pressure buildup data. In fact, an early-time deviation from the straight line can be caused by skin factor as well as by wellbore storage. Positive skin factor indicates a flow restriction, i.e., wellbore damage. A negative skin factor indicates stimulation.

What is geometric skin?

Geometric skin. When the area open to flow decreases, the pressure drop is greater than when the area is unchanged all the way to the formation face. Examples include flow converging to perforations (Fig. 3), partial penetration (Fig.

What is skin in production?

1. n. [Well Completions] A dimensionless factor calculated to determine the production efficiency of a well by comparing actual conditions with theoretical or ideal conditions. A positive skin value indicates some damage or influences that are impairing well productivity.

What is skin in well completion?

What is non Darcy skin?

Skin effect with a magnitude that depends on the flow rate of the wellbore fluid. Non-Darcy flow is typically observed in high-rate gas wells when the flow converging to the wellbore reaches flow velocities exceeding the Reynolds number for laminar or Darcy flow, and results in turbulent flow.

What is positive skin factor?

Positive skin factor indicates a flow restriction, i.e., wellbore damage. A negative skin factor indicates stimulation.

What is mechanical skin?

1. n. [Perforating, Well Completions] 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.

What is the skin function?

Provides a protective barrier against mechanical, thermal and physical injury and hazardous substances. Prevents loss of moisture. Reduces harmful effects of UV radiation. Acts as a sensory organ (touch, detects temperature).

What is skin effect in reservoir engineering?

Skin or skin effect in reservoir engineering is reduced permeability around the near well bore area due to the drilling process. This is usually caused by the invasion of the mud filtrate into the pores of the reservoir rock.

What is skinskin and why is it important?

Skin is a dimensionless factor calculated to determine the production efficiency of a well by comparing actual conditions with theoretical or ideal conditions. A positive skin value indicates some damage or influences that are impairing well productivity. A negative skin value indicates enhanced productivity, typically resulting from stimulation.

What is formation damage (skin factor)?

The notion of Formation damage (Skin Factor): As per the previous figure, a new term is introduced, ∆Ps or delta P skin. The term S stands for Skin Factor. Skin is a dimensionless factor calculated to determine the production efficiency of a well by comparing actual conditions with theoretical or ideal conditions.

Xuehao Tan PhD, in Petroleum Production Engineering (Second Edition), 2017 Skin factor is a constant that is used to adjust the flow equation derived from the ideal condition (homogeneous and isotropic porous media) to suit the applications in nonideal conditions.