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- W1603954284 abstract "Hydraulic fracturing is a technique frequently used to stimulate the production of an oil or gas well by creating a fracture in the porous rock around the wellbore. The success of a hydraulic fracture treatment depends heavily on the created fracture geometry. The optimum situation arises when a single, smooth-walled fracture propagates into the reservoir. The communication and production will reduce when a fracture is very tortuous, when multiple fractures propagate at small distance from each other, or when the intersection area between the fracture and borehole is small, e.g. when the fracture makes an angle with the borehole. When a cased perforated completion is treated, fractures may initiate from each perforation. These fractures propagate close to each other and compete for width when they fail to link. The perforations tend to attract fractures initiating from neighbouring perforations, which may link in this way. Linking reduces the number of multiples, and forces the fracture to propagate over the perforated interval along the borehole, increasing the intersection area. This attraction increases with decreasing perforation spacing. The number of perforations that can be created in a single run is limited. The perforation spacing will be minimised when all perforations are shot in a single row. This maximises the probability of link-up but introduces the risk of fracture initiation from the micro annulus. In that case the fracturing fluid will follow a very tortuous flow path to enter the fracture, which frequently results in failure of the fracturing operation. The perforations will therefore often be shot with a small phasing angle, so fractures will initiate at least from some perforations. This is the choice for a safe but sub-optimum solution. These considerations lead to the main questions requiring an answer: What is the critical spacing above which fracture initiation does not take place?; What is the possible gain in fracture geometry when perforations do link-up?; and, What is the risk of fracture initiation from the micro-annulus? One of the results form Van de Ketterij's research is the quantification of the fractures during the first stages of fracture propagation." @default.
- W1603954284 created "2016-06-24" @default.
- W1603954284 creator A5033154463 @default.
- W1603954284 date "2001-01-01" @default.
- W1603954284 modified "2023-09-27" @default.
- W1603954284 title "Optimisation of the Near-Wellbore Geometry of Hydraulic Fractures Propagating from Cased Perforated Completions" @default.
- W1603954284 hasPublicationYear "2001" @default.
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