CN-122020936-A - Bearing capacity calculation method and device for composite reinforced crack pipeline

CN122020936ACN 122020936 ACN122020936 ACN 122020936ACN-122020936-A

Abstract

The embodiment of the invention relates to a method and a device for calculating the bearing capacity of a composite material reinforced crack pipeline, wherein the method and the device comprise the steps of measuring and obtaining pipeline parameters, crack parameters and composite material parameters of a target composite material reinforced crack pipeline, calculating a first pipeline crack tip stress intensity factor under the influence of a composite material based on the pipeline parameters, the crack parameters and the composite material parameters, calculating a second pipeline crack tip stress intensity factor under the influence of an axial included angle of a crack and the pipeline based on the first pipeline crack tip stress intensity factor, and calculating the critical bearing capacity of the target composite material reinforced crack pipeline based on the second pipeline crack tip stress intensity factor. Therefore, the stress intensity factor can be simply and accurately calculated, and the bearing capacity of the crack expansion critical state is further calculated, so that the method plays an important role in evaluating the reinforcing effect of the composite material and the intensity of the reinforced pipeline.

Inventors

LIU HAIBO
WANG GUANJUN
HAN QING
HAN WEI
LIU CHAO
LIU JIN
LIU YANFENG
ZHAO JIE
TIAN WANG

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司胜利油田分公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. The method for calculating the bearing capacity of the composite reinforced crack pipeline is characterized by comprising the following steps of: measuring and obtaining pipeline parameters, crack parameters and composite material parameters of a target composite material reinforced crack pipeline; Calculating a first pipeline crack tip stress intensity factor under the influence of the composite material based on the pipeline parameters, the crack parameters and the composite material parameters; Calculating a second pipeline crack tip stress intensity factor under the influence of an included angle between the crack and the pipeline axial direction based on the first pipeline crack tip stress intensity factor; And calculating the critical bearing capacity of the target composite material reinforced crack pipeline based on the second pipeline crack tip stress intensity factor.
2. The method of claim 1, wherein the pipe parameters include at least pipe outer radius, wall thickness, elastic modulus, and poisson's ratio; the crack parameters at least comprise crack length and an axial included angle between the crack and the pipeline; The composite material parameters at least comprise the thickness and the elastic modulus of the composite material.
3. The method of claim 2, wherein the calculating a first pipe crack tip stress intensity factor under the influence of a composite material based on the pipe parameter, the crack parameter, and the composite material parameter comprises: Calculating a stress intensity factor of the pipeline with the crack angle along the axial direction of the pipeline through a first formula, wherein the first formula is as follows: Wherein K IP is the stress intensity factor of the pipeline with crack angle along the axial direction of the pipeline, P is the internal pressure of the pipeline, r e is the outer radius of the pipeline, t s is the wall thickness, F (λa) =0.985+0.1λa+0.135 (λa) 2 -0.018(λa) 3 ,υ s is poisson's ratio, and 2a is the measured crack length.
4. A method according to claim 3, characterized in that the method further comprises: calculating the pressure component born by the pipeline matrix after the reinforcement of the composite material through a second formula, wherein the second formula is as follows: Wherein P e is the pressure component born by the pipeline matrix after the composite material is reinforced, T c is the thickness of the composite material, E c is the elastic modulus of the composite material, r i is the inner diameter of the pipeline, r c is the distance from the inner wall of the composite material to the center of the pipeline, E s is the elastic modulus of the pipeline, P is the internal pressure of the pipeline, and D is the diameter of the pipeline; replacing P e with P in the first formula results in a first pipe crack tip stress intensity factor K ICom under the influence of the composite material.
5. The method of claim 4, wherein calculating a second pipe crack tip stress intensity factor under the influence of the crack and pipe axial angle based on the first pipe crack tip stress intensity factor comprises: Calculating a second pipeline crack tip stress intensity factor under the influence of an axial included angle between a crack and a pipeline through a third formula, wherein the third formula is K Ⅰβ ＝[0.65+0.35×cos(2β)]K Icom ; Wherein K Iβ is the second pipeline crack tip stress intensity factor under the influence of the crack and pipeline axial included angle, beta is the included angle of the crack and the pipeline axial, and K ICom is the first pipeline crack tip stress intensity factor under the influence of the composite material.
6. The method of claim 5, wherein calculating the critical load bearing capacity of the target composite reinforced cracked pipe based on the second pipe crack tip stress intensity factor comprises: Calculating the load bearing capacity of the pipeline matrix of the target composite material reinforced crack pipeline through a fourth formula, wherein the fourth formula is as follows: Wherein P e is the pipe matrix to bear load, K Ic is the pipe matrix fracture toughness and its value is the same as the second pipe crack tip stress intensity factor.
7. The method of claim 6, wherein the method further comprises: Calculating the ultimate bearing capacity of the target composite material reinforced crack pipeline through a fifth formula, wherein the fifth formula is as follows: wherein p is the ultimate bearing capacity of the target composite material reinforced crack pipeline.
8. A composite reinforced crack pipe load bearing capacity computing device, comprising: the acquisition module is used for measuring and acquiring pipeline parameters, crack parameters and composite material parameters of the target composite material reinforced crack pipeline; A calculation module for calculating a first pipeline crack tip stress intensity factor under the influence of the composite material based on the pipeline parameters, the crack parameters and the composite material parameters; The calculation module is further used for calculating a second pipeline crack tip stress intensity factor under the influence of an axial included angle between the crack and the pipeline based on the first pipeline crack tip stress intensity factor; the calculation module is further used for calculating the critical bearing capacity of the target composite reinforced crack pipeline based on the second pipeline crack tip stress intensity factor.
9. A computer device is characterized by comprising a processor and a memory, wherein the processor is used for executing a bearing capacity calculation program of the composite material reinforced crack pipeline stored in the memory so as to realize the bearing capacity calculation method of the composite material reinforced crack pipeline according to any one of claims 1-7.
10. A storage medium, wherein the storage medium stores one or more programs executable by one or more processors to implement the method for calculating the bearing capacity of a composite reinforced crack pipe according to any one of claims 1to 7.

Description

Bearing capacity calculation method and device for composite reinforced crack pipeline Technical Field The embodiment of the invention relates to the technical field of oilfield oil pipeline reinforcement, in particular to a method and a device for calculating the bearing capacity of a composite reinforced crack pipeline. Background The steel pipeline may have different defects in service, and the composite material reinforcement is a room temperature reinforcement method with simple construction and wide application range for the penetrating crack defect. The stress intensity factor of the crack tip is a key parameter for judging whether the crack is expanded, and the bearing capacity of the crack in the expansion critical state can be determined by taking the critical stress intensity factor as a criterion. The stress intensity factor of the reinforced crack tube of the composite material is accurately calculated, and the method plays an important role in evaluating the reinforcing effect of the composite material and the intensity of the reinforced pipeline. The conventional calculation method of the stress intensity factor of the reinforced crack tube made of the composite material is complex or has a small application range. Disclosure of Invention In view of the above, in order to solve the above technical problems or some technical problems, an embodiment of the present invention provides a method and an apparatus for calculating a bearing capacity of a composite reinforced crack pipeline. In a first aspect, an embodiment of the present invention provides a method for calculating a bearing capacity of a composite reinforced crack pipe, including: measuring and obtaining pipeline parameters, crack parameters and composite material parameters of a target composite material reinforced crack pipeline; Calculating a first pipeline crack tip stress intensity factor under the influence of the composite material based on the pipeline parameters, the crack parameters and the composite material parameters; Calculating a second pipeline crack tip stress intensity factor under the influence of an included angle between the crack and the pipeline axial direction based on the first pipeline crack tip stress intensity factor; And calculating the critical bearing capacity of the target composite material reinforced crack pipeline based on the second pipeline crack tip stress intensity factor. In one possible embodiment, the method further comprises: The pipeline parameters at least comprise the outer radius, the wall thickness, the elastic modulus and the poisson ratio of the pipeline; the crack parameters at least comprise crack length and an axial included angle between the crack and the pipeline; The composite material parameters at least comprise the thickness and the elastic modulus of the composite material. In one possible embodiment, the method further comprises: Calculating a stress intensity factor of the pipeline with the crack angle along the axial direction of the pipeline through a first formula, wherein the first formula is as follows: Wherein K IP is the stress intensity factor of the pipeline with crack angle along the axial direction of the pipeline, P is the internal pressure of the pipeline, r e is the outer radius of the pipeline, t s is the wall thickness, F (λa) =0.985+0.1λa+0.135 (λa) 2-0.018(λa)3,υs is poisson's ratio, and 2a is the measured crack length. In one possible embodiment, the method further comprises: calculating the pressure component born by the pipeline matrix after the reinforcement of the composite material through a second formula, wherein the second formula is as follows: Wherein P e is the pressure component born by the pipeline matrix after the composite material is reinforced, T c is the thickness of the composite material, E c is the elastic modulus of the composite material, r i is the inner diameter of the pipeline, r c is the distance from the inner wall of the composite material to the center of the pipeline, E s is the elastic modulus of the pipeline, P is the internal pressure of the pipeline, and D is the diameter of the pipeline; replacing P e with P in the first formula results in a first pipe crack tip stress intensity factor K ICom under the influence of the composite material. In one possible embodiment, the method further comprises: Calculating a second pipeline crack tip stress intensity factor under the influence of an axial included angle between a crack and a pipeline through a third formula, wherein the third formula is K Ⅰβ＝[0.65+0.35×cos(2β)]KIcom; Wherein K Iβ is the second pipeline crack tip stress intensity factor under the influence of the crack and pipeline axial included angle, beta is the included angle of the crack and the pipeline axial, and K ICom is the first pipeline crack tip stress intensity factor under the influence of the composite material. In one possible embodiment, the method further comprises: Calculating the load bearing capaci