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36 results about "Strain energy release rate" patented technology

The energy release rate G is the rate at which energy is lost as a material undergoes fracture, which is an energy-per-unit-area. The energy release rate is mathematically understood as the decrement in total potential energy scaled by the increment in fracture surface area. Various energy balances can be constructed relating the energy released during fracture to the energy of the resulting new surface, as well as other dissipative processes such as plasticity and heat generation.

Modeling method for compact sandstone reservoir three-dimensional fracability model

ActiveCN105134156AImproving the effectiveness of volumetric fracturingShorter payback timeFluid removalSpecial data processing applicationsModel methodWell placement
The invention relates to a modeling method for a compact sandstone reservoir three-dimensional fracability model. The method comprises the following steps: S1, establishing a relation formula among an internal friction angle, I type and II type crack fracture toughness and the parameter of sandstone mechanical characteristics; S2, establishing a shale fracability evaluation model which comprehensively considers an elastic parameter, the internal friction angle, the critical strain energy release rate and fracture toughness; S3, adopting a support vector machine algorithm to obtain a cluster analysis mode between the reservoir fracability and the elastic parameter; S4, adopting the cluster analysis mode to obtain a reservoir three-dimensional elastic parameter data body, and establishing the multi-scale compact sandstone reservoir three-dimensional fracability evaluation model based on the core, the borehole and the reservoir of multiple scales. According to the method, the fracability of an arbitrary space position in the compact sandstone reservoir can be obtained, a sweet spot with high fracability can always be drilled when drilling a compact sandstone gas well, blindness of well location selection is avoided, and the fracture modification effect and the yield after fracture are improved.
Owner:SOUTHWEST PETROLEUM UNIV

Strike-slip fault structure evolution analytical method

The invention belongs to the oil and gas field exploration and development and mineral evaluation and prediction field and relates to a strike-slip fault structure evolution analytical method. According to the strike-slip fault structure evolution analytical method, the fault paleo fall of different positions of a strike-slip fault is calculated, so that the periodic rhythm change of the paleo fall of the fault along a strike-slip direction is analyzed; restored graben-horst structures at two sides of the strike-slip fault in different periods are used to determine basin prototypes at the twosides of the strike-slip fault before the deposition of different strata, and identify the damping sections of the strike-slip fault; the unit movement intensity of the fault is calculated to characterize the strike-slip amount of the strike-slip fault; the calculated strain energy release rate of the strike-slip fault is used to analyze the dynamic mechanisms of different portions of the strike-slip fault; and the numerical simulation of a tectonic stress field is used to explain the fault from the aspect of dynamics and verify the formation mechanism of the strike-slip fault. The method foranalyzing the formation mechanism and evolution process of the strike-slip fault is systematically provided from a time and space four-dimensional perspective in the aspects of geometry, kinematics and dynamics.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Structural reliability sensitivity analysis method based on Lamb wave defect quantification

ActiveCN112182935ATimely formulation of maintenance support strategiesPracticalSustainable transportationDesign optimisation/simulationStructural reliabilitySensitive analysis
The invention provides a structural reliability sensitivity analysis method based on Lamb wave defect quantification, and the method comprises the steps: building a Lamb wave defect quantification model through a Lamb wave damage detection signal, and building a Lamb wave defect quantification uncertainty model through a maximum likelihood method, constructing a unit defect size performance parameter model by means of a strain energy release rate theory, constructing a unit fatigue crack propagation model by means of a Paris formula, constructing a structural overall dynamics model containinglocal defects by combining a finite element theory, and performing structural reliability prediction; and quantifying the influence of the quantitative uncertainty of the local unit defects in the structure on the structure reliability by adopting a sensitivity analysis method. The influence of uncertainty distribution parameters of all parameters in the Lamb wave defect quantitative model and thefatigue crack propagation model on the overall reliability of the structure is quantified, the uncertainty of reliability evaluation and life prediction results can be reduced conveniently, and the method has high practicability.
Owner:BEIHANG UNIV +1

Testing method for measuring interfacial strength of copper filling TSV

InactiveCN103196828ASolve the problem of difficult interface strength testingAccurate Critical Strain Energy Release RateUsing mechanical meansMaterial analysisCopperElectronic packaging
The invention discloses a testing method for measuring interfacial strength of a copper filling TSV (Through Silicon Via), and belongs to the field of three-dimensional electronic packaging testing. The method comprises the steps that a TSV electrocoppering pillar is extruded from a TSV through hole by a nanoindentor to obtain load on a pressure head / a displacement curve in the extrusion process; unloading and reloading are carried out in different stages of extrusion to obtain an unloading curve and a loading curve; and the distance between a copper pillar top end after unloading to the upper surface of a TSV adapter board is obtained by using an atomic force microscope (AMF). The energy consumed by interface destroy, namely interface cracking power can be obtained through analysis, and a critical strain energy release rate of an interface can be obtained through dividing an area of the destroyed interface with the interface cracking power. With the adoption of the method, the interfacial strength of the TSV generated by different electroplating technologies in the practical production process can be obtained, and the reliability of the TSV in the service process can be improved through comparing and selecting the optimal electroplating technology.
Owner:BEIJING UNIV OF TECH

A Modeling Method for 3D Fractability Model of Tight Sandstone Reservoir

ActiveCN105134156BImproving the effectiveness of volumetric fracturingShorter payback timeFluid removalSpecial data processing applicationsFeature parameterArenite
The invention relates to a modeling method for a compact sandstone reservoir three-dimensional fracability model. The method comprises the following steps: S1, establishing a relation formula among an internal friction angle, I type and II type crack fracture toughness and the parameter of sandstone mechanical characteristics; S2, establishing a shale fracability evaluation model which comprehensively considers an elastic parameter, the internal friction angle, the critical strain energy release rate and fracture toughness; S3, adopting a support vector machine algorithm to obtain a cluster analysis mode between the reservoir fracability and the elastic parameter; S4, adopting the cluster analysis mode to obtain a reservoir three-dimensional elastic parameter data body, and establishing the multi-scale compact sandstone reservoir three-dimensional fracability evaluation model based on the core, the borehole and the reservoir of multiple scales. According to the method, the fracability of an arbitrary space position in the compact sandstone reservoir can be obtained, a sweet spot with high fracability can always be drilled when drilling a compact sandstone gas well, blindness of well location selection is avoided, and the fracture modification effect and the yield after fracture are improved.
Owner:SOUTHWEST PETROLEUM UNIV

Seam-following cave-finding acid fracturing numerical simulation method and simulation system

The invention discloses a fracture-following cavern-finding acid fracturing numerical simulation method, which comprises the following steps: establishing a stress-flow-acid rock reaction coupling mathematical model: establishing a stress-flow-acid rock reaction coupling control equation, and setting initial conditions and boundary conditions; adopting a maximum strain energy release rate criterion to judge crack propagation; combining the control equation and the boundary condition by adopting a weighted margin method to obtain an equivalent integral weak form of the control equation; discretizing the control equation by adopting an extended finite element method to obtain an extended finite element discrete equation; establishing a physical model containing natural fractures and karst caves; and calculating the physical model based on the extended finite element discrete equation. According to the method, a set of crack hole type carbonate reservoir acid etching crack propagation model comprising a stress module, a flow module and an acid rock reaction module is established, a control equation is discretized by adopting an expansion finite element method, crack propagation is judged by utilizing a maximum strain energy release rate criterion, and an acid etching crack propagation path is researched.
Owner:CHINA PETROLEUM & CHEM CORP +1
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