深层致密储层大斜度井压裂裂缝扩展机制研究

doi:10.13722/j.cnki.jrme.2022.0548

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Abstract The efficient production method of tight sandstone reservoir in Tanhai block of Jidong oilfield is volume fracturing of deviated wells. The bidirectional deformation along the horizontal maximum principal stress direction and the vertical stress direction leads to the complex fracture morphology. The distortion interface is easy to form sand blocking phenomenon. Therefore，it is of great significance to clarify the law of fracture propagation in deviated wells. Based on the large-scale true triaxial hydraulic fracturing physical simulation experiment，this paper studies the influence law of horizontal stress difference，well inclination angle，azimuth angle and phase angle on the fracture initiation characteristics and propagation morphology of deviated well. The results showed that：(1) the fracture morphology of deviated well after fracturing can be divided into single fracture surface，double wing parallel fracture surface，multiple fracture surface and complex fracture surface. (2) Under the low horizontal stress difference coefficient，the number of perforation hole initiation is more. On the contrary，only the perforation hole with a small angle to the direction of the horizontal maximum principal stress starts to crack. (3) There are fewer fracture initiation points in 20° or 80° wells，while there are more fracture initiation points in 40° or 60° wells. The degree of fracture distortion increases first and then decreases with the increase of inclination angle. (4) When the azimuth angle is greater than 80°，the fracture initiation pressure increases，and the fracture morphology is mainly multiple fracture surface and complex fracture surface. (5) The increase of perforation phase angle leads to the increase of fracture initiation pressure. With the increase of hole spacing，the communication between holes becomes weaker，leading to the generation of secondary spreading fractures. It is suggested that the well trajectory design of formation with large horizontal stress difference should adopt large well inclination angle，small phase angle and small azimuth angle. It can effectively reduce the fracture initiation pressure and distortion degree，so as to solve the problem of sand blocking in site construction.

Key words： rock mechanics deviated well borehole trajectory parameters hydraulic fracturing fracture morphology tight reservoirs

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	HOU Bing1
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	CUI Zhuang1
	2
	ZENG Yue1
	2

Cite this article:

HOU Bing1,2,CUI Zhuang1, et al. Experimental study on fracture propagation morphology of deviated well in tight reservoir[J]. , 2023, 42(S2): 4054-4063.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0548 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS2/4054

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