Establishment and application of mechanical and mathematical models for multi-stage fracturing strings in a horizontal well

被引：0

作者：

Lian, Zhanghua ^{[1
]}

Zhang, Ying ^{[1
]}

Zhao, Xu ^{[2
]}

Ding, Shidong ^{[2
]}

Lin, Tiejun ^{[1
]}

机构：

[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, 610500, Sichuan

[2] Sinopec Research Institute of Petroleum Engineering and Technology, Beijing

来源：

Natural Gas Industry | 2015年 / 35卷 / 01期

关键词：

Hold-down packer; Horizontal well; Mathematical model; Mechanical model; Multi-stage fracturing; Sliding sleeve; Tahe Oilfield; Tarim Basin; Tubing strings;

D O I：

10.3787/j.issn.1000-0976.2015.01.011

中图分类号：

学科分类号：

摘要：

Multi-stage SRV fracturing of a horizontal well is a new technology developed at home and abroad in recent years to effectively develop shale gas or low-permeability hydrocarbon reservoirs, but on the other hand makes the mechanical environment of fracturing strings more complicated at the same time. In view of this, according to the loading features of tubing strings during the multi-stage fracturing of a horizontal well, mechanical models were established for three working cases of multi-packer setting, open differential-pressure sliding sleeve, and open ball-injection sliding sleeve under a hold-down packer. Moreover, mathematical models were respectively built for the above three cases. According to the Lame formula and Von Mises stress calculation formula for the thick-walled cylinder in the theory of elastic mechanics, a mathematical model was also established to calculate the equivalent stress for tubing string safety evaluation when the tubing string was under the combined action of inner pressure, external squeezing force and axial stress, and another mathematical model was established for mechanical strength and safety evaluation of multi-stage fracturing strings. In addition, a practical software was developed for the mechanical safety evaluation of horizontal well multi-stage fracturing strings according to the mathematical model developed for the mechanical calculation of multi-packer strings in a horizontal well. The research results were applied and verified in a gas well of the Tahe Oilfield in the Tarim Basin with excellent effects, providing a theoretical basis and a simple and reliable technical means for optimal design and safety evaluation of safe operational parameters of multi-stage fracturing strings in a horizontal well. ©, 2015, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：85 / 91

页数：6

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