Method for estimating shale reservoir post-fracturing plane transformation area

Abstract

The invention discloses a method for estimating shale reservoir post-fracturing plane transformation area. The method includes the specific steps: reading the wellhead fracture pressure P0 of each section of a single well; forecasting the bottom fracture pressure P1 of each section of the single well; calculating the actual bottom fracture pressure P2 of each section of the reservoir single well; acquiring a continuous fracture model; generating an equivalent fracture model; selecting extension pressure P3, average extension pressure P4 and effective construction time T; defining effective construction pressure P; clearly manifesting a tension and extrusion stress zone range in a fracture transformation strain forecasting map, and only considering a near well-bore extrusion stress zone in the fracture transformation strain forecasting map if P1-P2>p; taking the fracture transformation strain forecasting map as the post-fracturing plane transformation area if P1-P2<p; describing the post-fracturing plane transformation area and further evaluating fracture effects. By the aid of geo-mechanical modeling technology, the fracture transformation range is forecasted and evaluated, drilling and completion and fracture design is optimized, the fracture transformation effects are evaluated, and continuous and efficient mining of a shale gas field is realized.

Description

technical field [0001] The invention relates to the field of shale gas exploitation, in particular to a method for estimating the planar reconstruction area of ​​a shale reservoir after compression. Background technique [0002] "Hydraulic fracturing" is the core technology of shale gas exploitation. Due to the dispersed state of shale gas, the exploitation of shale gas must be performed by fracturing the shale formation to form a network of fractures in order to achieve the purpose of exploitation and stimulation. Most of domestic and foreign developments adopt large-scale hydraulic fracturing of horizontal wells. For regional development, the "well factory cluster well" development mode is adopted. The reasonable development well spacing adopted in Fuling shale gas field is 500-600m. The continuation of gas well exploitation will inevitably face pressure and lower and lower production until the natural production cycle of the gas well ends. How to further develop effecti...

AI Technical Summary

Problems solved by technology

The main disadvantage of microseismic monitoring technology in fracturing wells is that it cannot effectively evaluate fracturing for all wells in a block

First, due to technical and production constraints, a block often cannot find a suitable monitoring well, and many fractured wells cannot meet the monitoring conditions

Second, due to the control of production costs, it is impossible to implement microseismic monitoring technology for most or all wells in shale gas development

This has brought inconvenience to the exploitation of shale gas

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