137 results about "Fracture conductivity" patented technology

The invention discloses a method for evaluating the volume transformation capacity of a vertical well of a fractured tight oil reservoir. The method comprises the following steps: forming a transformation fracture network near a well bore, wherein the transformation region is divided into two parts, namely an inner area and an outer area, the inner area is an artificial main fracture transformation region, and the flow conductivity of an artificial main fracture is much higher than external supply, so that the region is assumed to have limited artificial main factures during a model derivation process, the attribute parameters of all factures are consistent, and the seepage of the fluid in a main fracture is linear seepage and follows the Darcy law; under the combined action of artificial fracture extending and reservoir rock brittle shear, the artificial fractures, shear fractures and natural fractures are criss-cross, so that the seepage mode of the region is changed into fracture conductivity primarily; a semi-analytical two-region comprehensive mathematical model which can be used for evaluating the volume transformation capacity of the vertical well is established. The method is applicable to evaluating multi-fracturing of the vertical well of a closed boundary fractured reservoir and the volume transformation of the vertical well of the fractured tight oil reservoir; reference is provided for reasonable development of the tight oil reservoir.

The invention provides an energy complementing and fracturing stimulation integrated repeated transformation method of a dense oil reservoir old well. The method comprises the following steps: S1, analyzing according to an early stage reservoir scaling type, using an optimized blockage relieving fluid formula to squeeze small-displacement blockage relieving fluid into an old well original perforation interval, removing formation wax and inorganic scale; S2, according to reservoir refracturing static pressure requirement, injecting a low-viscosity oil displacement fracturing fluid in medium displacement to an objective interval; S3, in an injection last phase of the objective interval, performing volume fracturing repeated transformation construction with low sand proportion, large displacement, and low-viscosity fluid as a main method, to further expand reservoir transformation volume and recover main fracture conductivity near a shaft; S4, after construction of the objective interval, shutting the well in to diffuse pressure, until wellhead pressure is reduced to 0MPa; S5, removing sand to complete the well, and putting the well into production . For a reservoir which is insufficient in initial stage transformation or an oil well whose fracture conductivity reduces obviously, the method further expands reservoir transformation volume, and realizes objectives of oil well production enhancement and natural decline reduction.