Judgment method for fracture diverting capacity of tight reservoir of oil and gas well

A technology for tight reservoirs and oil and gas wells, applied in the field of hydraulic fracturing to reduce expensive costs

Active Publication Date: 2018-07-20
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Problems solved by technology

[0004] Determining the diversion ability of reservoir fractures can provide a basic criterion for diversion fracturing stimulation. At present, there is no effective method to judge the diversion ability of tight reservoir fractures.

Method used

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  • Judgment method for fracture diverting capacity of tight reservoir of oil and gas well
  • Judgment method for fracture diverting capacity of tight reservoir of oil and gas well
  • Judgment method for fracture diverting capacity of tight reservoir of oil and gas well

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Embodiment Construction

[0028] Considering the four main factors of initial fracture dip angle, in-situ stress difference, rock fracture toughness and fluid pressure, the initial fracture inclination angles are 30°, 45°, and 60° respectively, and the horizontal in-situ stress difference is 0 MPa and 5 Mpa respectively. Pa, 10 MPa three levels, the fracture toughness is taken as 0 MPa m 1 / 2 , 0.5 MPa m 1 / 2 and 1 MPa m 1 / 2 Three levels, the fluid pressure in the fracture is respectively taken as 60 MPa, 70 MPa, and 80 MPa, and the 4-factor 3-level L9 (3 4 ) Orthogonal test scheme design, as different input parameters; use the extended finite element method to simulate the propagation path of the steering crack, define the rupture angle as the angle between the steering crack and the initial artificial crack, according to the steering crack path in the second step , to obtain the size of the cracking angle, and then use the formula (1) - formula (2) to normalize the above four factors, take the above ...

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Abstract

The invention discloses a judgment method for fracture diverting capacity of a tight reservoir of an oil and gas well. The method comprises the steps of 1) selecting four factors including an initialfracture dip angle, a ground stress deviation, rock fracture toughness and a fluid pressure, performing orthogonal test scheme design, and taking the factors as different input parameters; 2) taking the parameters as the input parameters, and simulating a diverted fracture expansion path by utilizing an extended finite element unit method; 3) according to the diverted fracture path in the step 2),calculating a corresponding fracture angle; 4) performing normalization processing on the four factors; 5) building a diverting capacity evaluation model, wherein a diverting capacity index DI is a sum of the four normalized factors; 6) judging the diverting capacity; and 7) drawing a curve between the fracture diverting capacity index DI and the corresponding fracture angle in the step 3). The fracture diverting capacity of the tight reservoir can be quickly and accurately obtained, and an indoor large physical modeling test does not need to be carried out, so that the test expense is reduced.

Description

technical field [0001] The invention belongs to the field of hydraulic fracturing in petroleum and natural gas engineering, and in particular relates to a method for judging the steering ability of fractures in tight reservoirs of oil and gas wells. Background technique [0002] Reservoir matrixes such as shale oil and gas and tight oil and gas have low permeability, and complex fracture networks must be formed through volume fracturing technology for efficient development. Steering fracturing is an important means to enhance the expansion and control of fracture network. When objective factors such as local stress difference are not conducive to fracture diversion, artificial additional shielding can be introduced through temporary plugging diverting agent to seal previously formed fractures and high-permeability channels. It is used for controlled steering fracturing, improving the scope and effect of stimulation. [0003] Zhou et al. used the formation temperature automa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 汪道兵葛洪魁宇波周福建孙东亮韩东旭李敬法李秀辉侯照锋刘露
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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