A study of influencing factors on fracture initiation pressure of cemented sliding sleeve fracturing

Yang, Huanqiang; Wang, Ruihe; Zhou, Weidong; Li, Luopeng; Chen, Fei

doi:10.1016/j.jngse.2014.03.002

Cited by 10 publications

(2 citation statements)

References 16 publications

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“…Therefore, the study of fracture initiation pressure is crucial for oil and gas production. Existing studies show that fracture trace angle [29], port number [30], the pressurization rate [31] and viscosity of fracturing fluid [32] all affect fracture initiation pressure. However, there are few studies on the influence of perforation spacing on initiation pressure.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Perforation Spacing on the Variation of Stress Shadow

2021

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When the shale gas reservoir is fractured, stress shadows can cause reorientation of hydraulic fractures and affect the complexity. To reveal the variation of stress shadow with perforation spacing, the numerical model between different perforation spacing was simulated by the extended finite element method (XFEM). The variation of stress shadows was analyzed from the stress of two perforation centers, the fracture path, and the ratio of fracture length to spacing. The simulations showed that the reservoir rock at the two perforation centers is always in a state of compressive stress, and the smaller the perforation spacing, the higher the maximum compressive stress. Moreover, the compressive stress value can directly reflect the size of the stress shadow effect, which changes with the fracture propagation. When the fracture length extends to 2.5 times the perforation spacing, the stress shadow effect is the strongest. In addition, small perforation spacing leads to backward-spreading of hydraulic fractures, and the smaller the perforation spacing, the greater the deflection degree of hydraulic fractures. Additionally, the deflection angle of the fracture decreases with the expansion of the fracture. Furthermore, the perforation spacing has an important influence on the initiation pressure, and the smaller the perforation spacing, the greater the initiation pressure. At the same time, there is also a perforation spacing which minimizes the initiation pressure. However, when the perforation spacing increases to a certain value (the result of this work is about 14 m), the initiation pressure will not change. This study will be useful in guiding the design of programs in simultaneous fracturing.

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Section: Discussionmentioning

confidence: 99%

The Effect of Perforation Spacing on the Variation of Stress Shadow

2021

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“…Based on the principle of the sliding sleeve (Yang et al, 2014;Zhang et al, 2017;Li et al, 2018;, the multi-stage fracturing technique has been achieved by a selfdesigned wellbore under experimental conditions. The process of three staged fractures is displayed in Figure 2.…”

Section: Experimental Apparatus and Staged Fracturing Designmentioning

confidence: 99%

A multi-perforation staged fracturing experimental study on hydraulic fracture initiation and propagation

Wei

Huang

Hao

et al. 2020

Energy Exploration & Exploitation

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Hydraulic fracture initiation and propagation are extremely important on deciding the production capacity and are crucial for oil and gas exploration and development. Based on a self-designed system, multi-perforation cluster-staged fracturing in thick tight sandstone reservoir was simulated in the laboratory. Moreover, the technology of staged fracturing during casing completion was achieved by using a preformed perforated wellbore. Three hydraulic fracturing methods, including single-perforation cluster fracturing, multi-perforation cluster conventional fracturing and multi-perforation cluster staged fracturing, were applied and studied, respectively. The results clearly indicate that the hydraulic fractures resulting from single-perforation cluster fracturing are relatively simple, which is difficult to form fracture network. In contrast, multi-perforation cluster-staged fracturing has more probability to produce complex fractures including major fracture and its branched fractures, especially in heterogeneous samples. Furthermore, the propagation direction of hydraulic fractures tends to change in heterogeneous samples, which is more likely to form a multi-directional hydraulic fracture network. The fracture area is greatly increased when the perforation cluster density increases in multi-perforation cluster conventional fracturing and multi-perforation cluster-staged fracturing. Moreover, higher perforation cluster densities and larger stage numbers are beneficial to hydraulic fracture initiation. The breakdown pressure in homogeneous samples is much higher than that in heterogeneous samples during hydraulic fracturing. In addition, the time of first fracture initiation has the trend that the shorter the initiation time is, the higher the breakdown pressure is. The results of this study provide meaningful suggestions for enhancing the production mechanism of multi-perforation cluster staged fracturing.

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Drilling and borehole techniques relevant to natural gas exploration and development: A collection of published research (2009–2015)

Wood

2015

Journal of Natural Gas Science and Engineering

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A study of influencing factors on fracture initiation pressure of cemented sliding sleeve fracturing

Cited by 10 publications

References 16 publications

The Effect of Perforation Spacing on the Variation of Stress Shadow

The Effect of Perforation Spacing on the Variation of Stress Shadow

A multi-perforation staged fracturing experimental study on hydraulic fracture initiation and propagation

Drilling and borehole techniques relevant to natural gas exploration and development: A collection of published research (2009–2015)

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