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Cased Hole and Openhole Completions
Wells completed through the conventional Contact category require separate trips into the well to fracture stimulate and isolate each stage. Conventional solutions can be divided into two techniques: cased hole and openhole completions.
Cased hole completions
Various methods can be used to access the reservoir, including wireline perforating, abrasive jetting, or shifting a sliding sleeve with the workstring. Fracture stimulation of each stage is performed by pumping down the casing or reservoir string. When multiple intervals are open in one stage, diversion can be attempted through various methods including limited entry (perforation friction pressure), ball sealers, or chemical diversion. The stage is then isolated using various techniques including setting composite bridge plugs, setting sand plugs, or natural isolation (induced stress diversion). This entire process is then repeated for remaining stages. A separate trip into the well is required for the next stage.
Openhole completions
In unconsolidated formations, a completion string may be deployed to ensure wellbore integrity. Typical completion strings include slotted liners or preperforated liners. The entire well may be fracture stimulated by pumping down the casing or reservoir string. Diversion can be attempted through various methods including limited entry (perforation friction pressure), ball sealers, or traditional chemical diversion.
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