Application of Vertical Well Close Cutting and Fracturing Technology in Low Permeability Reservoir of Y Oilfield

To address the challenges of conventional fracturing in the low-permeability reservoir of Y Oilfield, which fails to effectively improve the injection-production relationship of the existing well pattern, and the control degree of reserves by artificial fractures and well pattern system is not significantly enhanced, and the effective displacement cannot be established after fracturing, this study adopts the close-cutting fracturing technology for vertical wells. This technology uses blocking agents to enhance the pressure effect, control the length of the main fractures, and generate multiple branch fractures on both sides of the main fractures, effectively expanding the fracture-controlled volume and thereby enhancing the production increase efficiency. Moreover, the fracture morphology simulation is used to optimize the operation scale, shorten the injection-production distance, and extend the effective period of the measures. The field application results of three wells show that the average initial daily oil increase per well is 2.7 tons, which is 2.2 to 2.8 times that of conventional fracturing. The cumulative oil increase is 2,314 tons, with an input-output ratio of 1:4.1, and the effective period exceeds 18 months. This provides key technical support for the efficient development of low-permeability reservoirs.