Prediction method for extension track of hydrofracture complex fracture of conglomerate reservoir

A technology for hydraulic fracturing and complex fractures, applied in prediction, data processing applications, instruments, etc., can solve problems such as insufficient consideration of gravel geometry and irregular contours, lack of prediction and interpretation, and failure to consider gravel and matrix

Pending Publication Date: 2022-05-27
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Conglomerate is mainly composed of gravel, matrix and gravel edges. The gravel is mostly angular or sub-angular, mainly irregular polygonal. The current fracture extension method for hydraulic fracturing of conglomerate reservoirs does not fully consider the complex geometry and shape of the gravel. The irregular contour does not consider the influence of differen

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  • Prediction method for extension track of hydrofracture complex fracture of conglomerate reservoir
  • Prediction method for extension track of hydrofracture complex fracture of conglomerate reservoir
  • Prediction method for extension track of hydrofracture complex fracture of conglomerate reservoir

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Embodiment

[0189] Step (1) First generate a square servo boundary, specify a random number, and within the servo boundary, randomly generate a matrix particle model according to the particle size ratio, where the contact modulus of the matrix particles and the elastic modulus of parallel bonding are 20GP, and the parallel bonding The junction tensile strength is 15MPa, the stiffness ratio is 1.5, the parallel bonding cohesion is 20MPa, and the internal friction angle is 20°;

[0190] Step (2) According to a random generation method of a gravel profile established by the above method, a gravel profile is generated in the matrix model, and the gravel profile is as follows: figure 1 shown;

[0191] Step (3) generates a gravel profile according to (2) on the basis of the matrix model established in step (1), the matrix in the profile is defined as a gravel particle cluster, and the meso-mechanical parameters of the matrix particles and the gravel particles are respectively assigned, namely ...

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Abstract

The invention discloses a conglomerate reservoir hydrofracture complex fracture extension trajectory prediction method, which comprises the following steps: generating a square servo boundary, and randomly generating a matrix particle model in the servo boundary; generating a gravel profile in the matrix particle model; defining the matrix in the gravel contour as a gravel particle cluster, and respectively assigning the mesomechanics parameters of matrix particles and gravel particles; gravel edge contact on the gravel contour is obtained by writing a traversal function; establishing a pipe domain seepage model, carrying out fluid-solid coupling, giving an injection rate, and establishing a crack extension criterion; gravels with different cementation strengths and crack extension tracks under the gravel edges with different cementation strengths are simulated by changing microscopic mechanical parameters of gravel particles and gravel edges. The method has the following beneficial effects that complex geometrical shapes and irregular outlines of gravels and different cementing strengths of gravel edges are fully considered, and the process of generating complex cracks when hydrofracture cracks meet the gravels can be further known.

Description

technical field [0001] The invention relates to a method for predicting the extension trajectory of complex fractures of conglomerate reservoir hydraulic fracturing, and belongs to the field of oil and gas field stimulation and reconstruction. Background technique [0002] Conglomerate reservoirs generally have the characteristics of low porosity, low permeability and strong heterogeneity. At present, hydraulic fracturing has become the main measure for stimulation and stimulation of tight conglomerate reservoirs. [0003] The pore structure of conglomerate reservoirs is relatively complex, with strong heterogeneity and obvious anisotropy, and gravel particles have a great influence on the fracture extension process. Impact. Conglomerate is mainly composed of gravel, matrix and gravel edge, among which the gravel is mostly angular or sub-angular, mainly irregular polygons. The current method of hydraulic fracturing fracture extension of conglomerate reservoirs does not full...

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/02G06F30/25G06F119/14
CPCG06Q10/04G06Q50/02G06F30/25G06F2119/14
Inventor 杨兆中张明月易良平李小刚
Owner SOUTHWEST PETROLEUM UNIV
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