Influence of Perforation Parameter on Crack Initiation and Extending of Hydraulic Fracturing

2012 ◽  
Vol 594-597 ◽  
pp. 202-206 ◽  
Author(s):  
Min Zheng Jiang ◽  
Yang Li ◽  
Yi Ming Zhang ◽  
Tian Xue Jiang ◽  
Ming Xing Liu
Keyword(s):  
Crack Initiation ◽  
Hydraulic Fracturing ◽  
Mechanical Model ◽  
Fracture Criterion ◽  
Tensile Fracture ◽  
Low Permeability ◽  
Dynamic Effects ◽  
Low Permeability Reservoir ◽  
Initiation Pressure ◽  
Hole Effect

Widespread problem in hydraulic fracturing of low-permeability reservoir is difficulty of crack initiation of fracturing, high initiation pressure of fracturing put forward higher requirements of fracturing equipment. Low-permeability reservoir for the study, in the fluid-solid coupling conditions, established a low-permeability reservoir perforation mechanical model of stress, using numerical solution techniques, consider the dynamic effects, we can achieve the stress distribution at different stages: drilling, well cementation, perforation and fracturing in low-permeability reservoir. With rock tensile fracture criterion can determine the initiation location and initiation pressure. The results show that the lower the degree of pollution in perforating hole, the smaller the pressure from the crack initiation as well as the higher the degree of pollution in perforating hole, the larger the pressure from the crack initiation. Orientation, diameter and depth of perforating hole effect on crack initiation and extension are more significant.

Effects of Perforation Pollution Zone on Fracture Initiation

2011 ◽  
Vol 255-260 ◽  
pp. 2761-2765
Author(s):  
Su Ling Wang ◽  
Qing Bin Li ◽  
Zhen Xu Sun ◽  
Zheng Wei Tian
Keyword(s):  
Mechanical Model ◽  
Transient Analysis ◽  
Fracture Initiation ◽  
Low Permeability ◽  
Low Permeability Reservoir ◽  
Fracture Pressure ◽  
Key Factor ◽  
Initiation Pressure ◽  
Fluid Coupling ◽  
Solid Fluid Coupling

Fracture initiation is a key factor of hydraulic fracturing, as lack of research on fracture initiation position.The perforation geostress mechanical model of low permeability reservoir is built according to the rock mechanics, seepage mechanics, elastic-plastic mechanics, considering solid-fluid coupling and rock material nonlinearity. Adopting the transient analysis, low-permeability reservoir geostress distribution of different stages is obtained using the finite element, such as drilling - cementing - perforation –fracturing. Determine the fracture initiation position and fracture pressure combining with the rock failure criterion. Calculated on well Ao332-32, the error rate of initiation pressure between test and calculation is 3.5 percent. It is proved that the model is reasonable.

Research on Horizontal Well Hydraulic Fracture Crack Initiation Law of Low Permeability Reservoir

2014 ◽  
Vol 670-671 ◽  
pp. 728-731
Author(s):  
Su Ling Wang ◽  
Ying Zhang ◽  
Guo Feng Zhao ◽  
Si Qi Wang ◽  
Shan Ren Zhang
Keyword(s):  
Numerical Simulation ◽  
Crack Initiation ◽  
Hydraulic Fracture ◽  
Horizontal Well ◽  
Damage Mechanics ◽  
Influence Factor ◽  
Low Permeability ◽  
Construction Technology ◽  
Low Permeability Reservoir ◽  
Initiation Pressure

Horizontal well hydraulic fracture construction technology has already become the main development means of low permeability reservoir, and the crack initiation pressure is a key factor in fracture construction. Taking ABAQUS as the platform, combined with rock mechanics, elastic mechanics, fracture mechanics, damage mechanics and fluid-solid coupling theory, to establish horizontal well mechanical model, crack initiation law of horizontal well under different conditions were obtained by using finite element method. According to the horizontal well fracture tested data in Daqing peripheral oil fields, the crack initiation pressure and numerical simulation results are in good agreement, it shows that the numerical simulation method is reasonable, then analyze influence factor of crack initiation pressure on the basis.

Experimental and numerical investigation into nano-stabilized foams in low permeability reservoir hydraulic fracturing applications

Fuel ◽  
2018 ◽  
Vol 213 ◽  
pp. 133-143 ◽  
Author(s):  
Yang Fei ◽  
Raymond L. Johnson ◽  
Mary Gonzalez ◽  
Manouchehr Haghighi ◽  
Kunakorn Pokalai
Keyword(s):  
Hydraulic Fracturing ◽  
Numerical Investigation ◽  
Low Permeability ◽  
Low Permeability Reservoir

scholarly journals A Crack Propagation Control Study of Directional Hydraulic Fracturing Based on Hydraulic Slotting and a Nonuniform Pore Pressure Field

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yugang Cheng ◽  
Zhaohui Lu ◽  
Xidong Du ◽  
Xuefu Zhang ◽  
Mengru Zeng
Keyword(s):  
Crack Initiation ◽  
Hydraulic Fracturing ◽  
Pore Pressure ◽  
Pressure Field ◽  
Process Analysis ◽  
Failure Process ◽  
Horizontal Stress ◽  
Directional Hydraulic Fracturing ◽  
Rock Failure Process ◽  
Initiation Pressure

Hydraulic fracturing techniques for developing deeply buried coal reservoirs face routine problems related to high initial pressures and limited control over the fracture propagation direction. A novel method of directional hydraulic fracturing (DHF) based on hydraulic slotting in a nonuniform pore pressure field is proposed. A mechanical model is used to address crack initiation and propagation in a nonuniform pore pressure field, where cracks tend to rupture and propagate towards zones of high pore pressure for reducing the effective rock stress more. The crack initiation pressure and propagation morphology are analyzed by rock failure process analysis software. The numerical results show that the directional propagation of hydraulic fracturing cracks is possible when the horizontal stress difference coefficient is less than or equal to 0.5 or the slotting deviation angle is less than or equal to 30°. These findings are in good agreement with experimental results, which support the accuracy and reliability of the proposed method and theory.

Influence of Perforating Parameters on the Productivity of Fractured Well in Tight Reservoir

2013 ◽  
Vol 848 ◽  
pp. 92-95
Author(s):  
Hai Yong Zhang ◽  
Shun Li He ◽  
Dai Hong Gu ◽  
Guo Hua Luan ◽  
Cheng Quan Men ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Specific Area ◽  
Field Application ◽  
Oil Field ◽  
Low Permeability ◽  
Effective Measure ◽  
Low Permeability Reservoir ◽  
Artificial Fracture ◽  
Fractured Well ◽  
Selection Of

Hydraulic fracturing is an effective measure to increase oil production for the development of low permeability reservoir. The selection of perforating parameters has a direct effect on the fracture expansion, formation fracture cracking pressure and even the implementation success of fracturing in that the fracturing processing fluid and artificial fracture all need to pass through the extension of perforation. In field application, the selection of perforating parameters is usually determined base on experience without combining with the actual data of the hydraulic fracturing wells. This work focuses on analyzing the influence of perforating parameters on the productivity of fractured well based on an established productivity prediction model through analytical method.Results show that, take a specific area of Changqing oil field for example, the perforation diameter has little effect on the productivity after fracturing, the other optimized perforating parameters are as follows: the perforation degree 30~40%, perforation density 8~12 perforation per meter, perforation depth 0.2~0.3m. The results are helpful to guide the optimization of perforating parameters in low permeability reservoir.

scholarly journals WATERFLOOD-INDUCED FRACTURE ON THE INJECTION WELLS IN LOW-PERMEABILITY RESERVOIR OF ACHIMOV SEQUENCE

2018 ◽  
pp. 39-43
Author(s):  
A. V. Klimov-Kayanidi ◽  
R. T. Alimkhanov ◽  
E. S. Agureeva ◽  
R. M. Sabitov
Keyword(s):  
Hydraulic Fracturing ◽  
Low Permeability ◽  
Reservoir Pressure ◽  
Reservoir Properties ◽  
Injection Wells ◽  
Field Development ◽  
Low Permeability Reservoir ◽  
Fracture Formation ◽  
Maintenance Systems

Achimov sequence is characterized by high heterogeneity and low reservoir properties, that makes it impossible economically profitable field development without hydraulic fracturing and usage reservoir pressure maintenance systems. The research aims to develop recommendations for regulating the operations of injection wells, in conditions of waterflood-induced fracture formation. The recommendations can be used to further regulate the waterflooding system for the conditions of Achimov sequence.

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