Well Completions and Stimulation Flashcards

What is the primary purpose of a packer in a well completion?

Answer: To isolate zones and seal the annulus between tubing and casing

Packers isolate production zones and seal the annulus to direct fluids through the tubing string.

In a gravel pack completion, what is the primary function of the gravel?

Answer: To filter formation sand while maintaining fluid flow

Gravel packs filter formation sand particles, preventing them from migrating into the wellbore while allowing hydrocarbons to flow.

Which type of perforation gun system is conveyed on electric wireline?

Answer: Wireline-conveyed perforating

Wireline-conveyed perforating guns are run on electric wireline and fired electrically from surface.

What does the term 'skin factor' represent in well completions?

Answer: A dimensionless measure of near-wellbore flow restriction or enhancement

Skin factor is a dimensionless number quantifying additional pressure drop (positive skin = damage, negative skin = stimulation).

What is the main advantage of an openhole completion over a cased-hole completion?

Answer: Lower cost and no perforation damage

Openhole completions avoid the cost of cementing and perforating, and eliminate perforation-induced damage near the wellbore.

Which fluid property is most critical when designing a hydraulic fracturing treatment to prevent premature screenout?

Answer: Fluid viscosity and leak-off coefficient

Viscosity controls proppant transport and fracture width, while leak-off determines fluid efficiency; both are critical to prevent screenout.

In a smart well completion, what do Inflow Control Devices (ICDs) primarily accomplish?

Answer: Balance flow contributions along the wellbore to delay water or gas breakthrough

ICDs create a pressure drop that equalizes inflow along horizontal wellbores, delaying early water or gas breakthrough from high-permeability zones.