What is coiled tubing servicing?

Well stimulation includes techniques for overcoming the problem of tight formations or formations that have low permeability i.e. how well the spaces containing hydrocarbons are connected to each other. Well stimulation overcomes low permeability by creating new flow channels or enlarging old ones. The two most common methods are acidizing (acid stimulation) and hydraulic fracturing.

Hydraulic fracturing is all about pressure. Several powerful pumps inject a liquid, the fracturing fluid, into the well at a fast rate. The fluid develops a high pressure that actually splits or fractures the rock. The fluid acts like a wedge and high pressure is the force that pushes it into the rock. Hydraulic fracturing improves the productivity of a well by either creating new fractures that act as flow channels or extending existing flow channels farther into the formation. The fracturing fluid is either water-based or nitrogen. Not only must the fluid breakdown the formation but it must also transport proppants or propping agents into the formation. Proppants hold open the fractures when fracturing is complete. Sand is the most common proppant. Coal bed methane wells are fractured using nitrogen gas rather than a water-based fluid. The nitrogen prevents the coal seams from swelling.

Technicoil provides a cost-effective means of conveying fracturing fluids and gases to a given reservoir. The Technicoil coiled fracturing rig fleet provides a variety of platforms to allow our clients pumping equipment to fracture stimulate multiple horizons in gas wells throughout the Western Canadian Sedimentary Basin. Most shallow gas wells have multiple producing zones that are co-mingled during the production phase of the wells life. Many wells have in excess of 15 individual producing intervals.

In a conventional fracturing model, fracturing fluids and gases are pumped into a well and a series of perforation sealing balls are released into the fracturing media during the pumping process. The balls in theory migrate to the perforations that are receiving more of the fracturing treatment and plug them off, forcing the fracturing media to be directed to other perforations. This model provides a limited amount of control over a fracturing treatment.

In the coiled fracturing model, each producing interval is stimulated separately. The customer is able reliably place fracturing products directly in a given producing interval providing a more effective stimulation treatment and enhancing a wells production.

Coiled tubing conveyed fracturing has been developed within the past 10 years in Western Canada and continues to enjoy market growth and wide industry acceptance.

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