An evaluation method of volume fracturing effects for vertical wells in low permeability reservoirs

被引：0
|
作者：
Zhang A. [1 ]
Yang Z. [1 ,2 ]
Li X. [3 ]
Xia D. [1 ,2 ]
Zhang Y. [1 ,2 ]
Luo Y. [1 ,2 ]
He Y. [1 ,2 ]
Chen T. [1 ,2 ]
Zhao X. [1 ,2 ]
机构：
[1] Research Institute of Petroleum Exploration & Development, PetroChina, Beijing
[2] Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang
[3] Research Institute of Petroleum Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay
来源：
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2020年 / 47卷 / 02期
关键词：
Conductivity; Fracturing area; Fracturing effect evaluation; Low permeability reservoir; Vertical well; Volume fracturing;
D O I：
10.11698/PED.2020.02.20
中图分类号：
学科分类号：
摘要：
To evaluate the fracturing effect and dynamic change process after volume fracturing with vertical wells in low permeability oil reservoirs, an oil-water two-phase flow model and a well model are built. On this basis, an evaluation method of fracturing effect based on production data and fracturing fluid backflow data is established, and the method is used to analyze some field cases. The vicinity area of main fracture after fracturing is divided into different stimulated regions. The permeability and area of different regions are used to characterize the stimulation strength and scale of the fracture network. The conductivity of stimulated region is defined as the product of the permeability and area of the stimulated region. Through parameter sensitivity analysis, it is found that half-length of the fracture and the permeability of the core area mainly affect the flow law near the well, that is, the early stage of production; while matrix permeability mainly affects the flow law at the far end of the fracture. Taking a typical old well in Changqing Oilfield as an example, the fracturing effect and its changes after two rounds of volume fracturing in this well are evaluated. It is found that with the increase of production time after the first volume fracturing, the permeability and conductivity of stimulated area gradually decreased, and the fracturing effect gradually decreased until disappeared; after the second volume fracturing, the permeability and conductivity of stimulated area increased significantly again. © 2020, The Editorial Board of Petroleum Exploration and Development. All right reserved.
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页码：409 / 415
页数：6
相关论文
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