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To infer strength and large-scale fracture-design requirements (stress testing), interval injection tests using wireline formation test (WFT) dual packers may be carried out. The resulting logarithmic time dependence on the pressure rise is limited by the fracture initiation. Thus, the response may be used to determine the required threshold pressure for hydraulic fracturing.

Since its introduction in 1947 (Howard and Fast 1970), hydraulic fracturing followed by proppant has enabled creation of high hydraulic conductivity pathway(s) within the formation that are distinguished from natural fractures. Hydraulic fracturing may overcome damage-induced skin but, more importantly, form a large surface area enabling flow from the formation into the wellbore. To form hydraulic fractures, the threshold pressure must be exceeded and maintained at the propagating tip of the fracture. Therefore, pump design requires the fracture-threshold pressure, preferably at several depth positions.

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