Volume fracturing construction parameter optimization design method for unconventional oil and gas reservoir infill well

Abstract

The invention discloses a volume fracturing construction parameter optimization design method for an unconventional oil and gas reservoir infill well. The optimization design method comprises the following steps: S1, establishing a three-dimensional geologic model with physical and geomechanical parameters; S2, establishing a natural fracture network model by integrating rock core-logging-seismicdata; S3, generating an old well hydraulic fracturing complex fracture based on the natural fracture model; S4, establishing a three-dimensional shale gas reservoir seepage model; s5, establishing a three-dimensional geomechanical model; s6, analyzing and calculating a dynamic crustal stress field; s7, establishing an infill well horizontal fracturing complex fracture numerical model based on theold well complex fracture and the dynamic crustal stress calculation result; and S8, optimally designing volume fracturing construction parameters of the infill well. The method has the beneficial effects that the influence of the long-term exploitation process of the shale reservoir with natural fracture development on the volume fracturing of the infill well can be accurately reflected, the fracturing construction parameters of the infill well are optimally designed, the fracturing effect is effectively improved, and the single-well productivity is increased.

Description

technical field [0001] The invention relates to the field of oil and gas resource development and its production stimulation, in particular to an optimization design method for volume fracturing operation parameters of infill wells in unconventional oil and gas reservoirs. Background technique [0002] The efficient development of shale gas resources in my country mainly adopts horizontal wells + segmented multi-cluster perforation + large-displacement volume fracturing technology to form a fracture network with high conductivity to realize volume stimulation of reservoirs. After a period of production, the production of a single well declines rapidly, and it is necessary to supplement the production capacity of the block through infill wells + hydraulic fracturing, fully develop the undeveloped areas, and increase the recovery rate. If the hydraulic fracturing effect of the infill well is not good, it will greatly limit the productivity of the single well of the infill well...

AI Technical Summary

Problems solved by technology

[0003] Conventional infill well fracturing design can only evaluate the current in-situ stress around the well based on core experiments, drilling, logging, and leakage experiments, and use the initial in-situ stress field in early seismic or geological data to predict the current in-situ stress field Therefore, it is impossible to take into account the change of in-situ stress caused by the long-term exploitation of production wells in the early stage into the overall in-situ stress field of the reservoir, and thus it is impossible to carry out effective fracturing design for infill wells according to the current reservoir stress state

On the other hand, traditional dynamic in-situ stress analysis (such as patent numbers CN2017102173386 and CN2017102173403) often cannot take into account the influence of the natural fracture network of the reservoir and the complex fractures of previous fracturing. The results of stress change are quite different

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