Evaluation of Volume Fracturing of Vertical Well in Tight Gas Reservoirs Using Numerical Simulation

EasyChair Preprint 7233

Abstract

Slickwater volume fracturing with high pump rates and large fluid volumes may form a complex fracture network, and achieve more large-scale stimulated reservoir volume than a conventional fracturing treatment in tight gas reservoirs. These complex fracture networks are composed of main induced fractures and multiple branch fractures. Therefore, the conventional bi-wing fracturing model can not characterize its characteristics sufficiently. However, quantifying the complex fracture network still faces a significant challenge. Both a new and more accurate volumetric fracturing modeling and evaluation technology are urgently needed. Based on the geological properties and fracturing treatment parameters of a single vertical well in a tight gas reservoir, a heterogeneous seepage model is established. We propose a composite multi-porosity flow model coupled with multiple linear flow regimes. The main fracture and multiple branch fractures orthogonal to it are used to represent the complex fracture network, and the number of branch fractures is used as an evaluation index for the effectiveness of reservoir simulation. Taking the vertical tight gas well as an example, the conventional and volume fracturing numerical models are established respectively. The accuracy of the two fracturing models is compared and analyzed by history matching methods, and the fracturing performances of the vertical well are evaluated. The results show that the reservoir properties obtained by history matching conventional fracturing are unreasonable, while the accuracy rate of the volume fracturing of the numerical model reaches 90%. On the basis of the volume fracturing modeling, as the scale of treatment increases, the production will increase to a certain extent. The proposed volume fracturing modeling provides a new approach for evaluating the effectiveness of the tight gas reservoir stimulation, which is of great significance to fracturing treatment design.

Keyphrases: Evaluation of Volume Fracturing, Fracturing Modification, branch fracture, main fracture, multi-linear flow, numerical simulation

@booklet{EasyChair:7233,
  author    = {Yi Zou and Desheng Zhou and Haiyang Wang and Xianlin Ma and Qian Gao and Hongxia Liu},
  title     = {Evaluation of Volume Fracturing of Vertical Well in Tight Gas Reservoirs Using Numerical Simulation},
  howpublished = {EasyChair Preprint 7233},
  year      = {EasyChair, 2021}}