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.

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.

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.

Mechanism and Application Effect of Compound Perforation Fracturing Technology in Low Permeability Reservoir

2014 ◽  
Vol 675-677 ◽  
pp. 1500-1504
Author(s):  
Zeng Li Xiao ◽  
Yong Jie Fan ◽  
Jun Bin Chen
Keyword(s):  
Oil And Gas ◽  
Influence Factor ◽  
Physical Property ◽  
Low Permeability ◽  
Gas Field ◽  
Low Permeability Reservoir ◽  
Fracture Pressure ◽  
Compaction Band ◽  
Oil And Gas Field ◽  
The Cost

Compound perforation fracturing technology is a space combination type ultra-deep perforating that can overcome some flaws conventional perforation has, such as shallow penetration and compaction damage. It can remove the compaction band and near wellbore pollution in rock matrix which results from conventional perforation. This paper introduces the theory of effect and influence factor of compound perforation fracturing technology and summarize the advantages for low permeability gas well on the basis of analyzing the mechanism of action about increase production of compound perforation. In order to evaluate the effects of application of this technology in in low permeability reservoir, 11 compound perforation wells and 12 conventional perforation wells were selected which have the similar physical property and the evaluation was conducted in two blocks. The results show that compound perforation can make the formation fracture pressure decrease in 3~5MPa and increase the permeability near the perforation channel. This technology has better effects than the conventional and decrease the cost effectively, improving production in low permeability oil and gas field.

scholarly journals Optimization and characterization of biosurfactant produced by indigenous Brevibacillus borstelensis isolated from a low permeability reservoir for application in MEOR

RSC Advances ◽  
2022 ◽  
Vol 12 (4) ◽  
pp. 2036-2047
Author(s):  
Hao Dong ◽  
Anying Zheng ◽  
Yanlong He ◽  
Xiaotong Wang ◽  
Yang Li ◽  
...  
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Low Permeability ◽  
Microbial Enhanced Oil Recovery ◽  
Low Permeability Reservoir ◽  
Key Factor

Biosurfactants are expected to be a key factor for microbial enhanced oil recovery (MEOR).

Characteristics of Pore-Throat Structure and Mass Transport in Ultra-Low Permeability Reservoir

2013 ◽  
Vol 562-565 ◽  
pp. 1455-1460
Author(s):  
Qian Hua Xiao ◽  
Zheng Ming Yang ◽  
Xue Wu Wang
Keyword(s):  
Mass Transport ◽  
Size Distribution ◽  
Low Permeability ◽  
Pore Throat ◽  
Porous Flow ◽  
Low Permeability Reservoir ◽  
Flow Capacity ◽  
Reservoir Permeability ◽  
Key Factor ◽  
Small Tube

Low permeability reservoir is one of the most important petroleum reserve types in China. Therefore, some basic scientific problems about low permeability reservoir such as pore-throat size distribution, principle of porous flow should be deeply studied. Pore-throat size distribution, based on 69 cores from Changqing and Daqing oilfield of China, has been measured by comprehensive using Constant-Rate Mercury Injection and Nuclear Magnetic Resonance. It has been found that the Nano-pore-throat takes more than 60 percent of the total pore-throat of the low permeability reservoir and it is the key factor affecting the flow capacity when the permeability is less than 0.5×10-3μm2. The nano-pore-throat takes less than 40 percent of the total pore-throat and micron-pore-throat takes more than 45 percent when the permeability is larger than 5×10-3μm2. And Micron-pore-throat is the key factor affecting the flow capacity of low permeability reservoir. But when the reservoir permeability is between 0.5×10-3μm2 and 5×10-3μm2, its flow capacity is determined by the sub-micron-pore-throat and the amount of micron-pore-throat. Additionally, the key forces in micro-, sub-micro- and nanoscale pore-throat has been got by analyzing. The electrokinetic coupling matrix of mass transport has been gotten by analyzing the characteristics of the mass transport in small tube at different Debye ratio and pore-throat size distribution of ultra-low permeability.

A new low-permeability reservoir core analysis method based on rate-transient analysis theory

Fuel ◽  
2019 ◽  
Vol 235 ◽  
pp. 1530-1543 ◽  
Author(s):  
Christopher R. Clarkson ◽  
Atena Vahedian ◽  
Amin Ghanizadeh ◽  
Chengyao Song
Keyword(s):  
Transient Analysis ◽  
Low Permeability ◽  
Core Analysis ◽  
Analysis Method ◽  
Low Permeability Reservoir ◽  
Rate Transient Analysis ◽  
Analysis Theory

The Influence of Dynamic Capillary Pressure on the Seepage of Ultra-Low Permeability Reservoir

2014 ◽  
Vol 7 (1) ◽  
pp. 55-63 ◽  
Author(s):  
Haiyong Zhang ◽  
Shunli He ◽  
Chunyan Jiao ◽  
Guohua Luan ◽  
Shaoyuan Mo
Keyword(s):  
Capillary Pressure ◽  
Low Permeability ◽  
Low Permeability Reservoir ◽  
Dynamic Capillary Pressure
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