Horizontal well fracturing stimulation technology for deep shale gas reservoirs

被引：0
|
作者：
Shen C. [1 ]
Guo X. [1 ]
Chen M. [2 ]
Yong R. [1 ]
Fan Y. [1 ]
机构：
[1] Shale Gas Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, 610051, Sichuan
[2] Chongqing Shale Gas Exploration and Development Co. Ltd., Chongqing
来源：
Natural Gas Industry | 2019年 / 39卷 / 10期
关键词：
Deep layer; Fracturing stimulation technique; Geology-engineering integration; Reservoir; Shale gas; Southern Sichuan Basin; Test of techniques; Western Chongqing area;
D O I：
10.3787/j.issn.1000-0976.2019.10.008
中图分类号：
学科分类号：
摘要：
There are huge shale gas resources in the deep reservoirs of southern Sichuan Basin, but due to their great burial depth and complex structures, the main technology of staged stimulated reservoir volume (SRV) suitable for the shallow shale gas reservoirs lower than 3 500 m is not applicable to the fracturing stimulation of deep shale gas reservoirs over 3 500 m and can hardly generate complex fracture networks. In this paper, a set of reservoir stimulation techniques based on horizontal well suitable for the shale gas reservoirs in deep complex structures were developed referring to the fracturing techniques used for the large-scale benefit development of shale gas above 3 500 m, combined with the structural and reservoir characteristics of deep shale. And they were applied on site to the fracturing stimulation of deep shale gas wells in the western Chongqing area. And the following research results were obtained. First, by virtue of the comprehensive natural fracture prediction technique, the natural fracture belts are characterized precisely and the development intensity of natural fractures is predicted quantitatively, so as to provide a basis for the optimization of subsequent fracturing operations. Second, among the parameters for evaluating the fracability of shale reservoir, the higher the brittleness index, fracture network propagation index and gas content index, the greater the reconstruction potential of reservoirs and the better the stimulation effect of gas wells. Third, the adoption of large-scale prepad fluid technique, "intense liquid injection, small number of perforations, and proppant injection of low-concentration slug type" technique and temporary plugging and diversion technique for improving the complexity of fracture networks increases single-well SRV and productivity effectively. In conclusion, the reservoir stimulation techniques developed in this paper are suitable for the fracturing stimulation of deep shale gas reservoirs and can be used as reference for the fracturing operations of similar shale gas wells. © 2019, Natural Gas Industry Journal Agency. All right reserved.
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页码：68 / 75
页数：7
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