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Method for predicting service life of glass fiber reinforced plastic pipe

A prediction method and service life technology, applied in the direction of measuring devices, analysis materials, instruments, etc., can solve the problems of pipe life danger, chemical structure and performance changes, non-compliance, etc., and achieve high prediction reliability, short test period, and combined tight effect

Active Publication Date: 2020-07-31
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, petroleum and natural gas fluids are generally corrosive to a certain extent, and corrosive media will cause the aging of FRP pipes, changes in chemical structure and performance, thereby reducing or losing performance
The test medium used in the existing method does not conform to the actual working conditions in the oil and gas field, and the pipe life predicted by the existing method will be dangerous

Method used

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  • Method for predicting service life of glass fiber reinforced plastic pipe
  • Method for predicting service life of glass fiber reinforced plastic pipe
  • Method for predicting service life of glass fiber reinforced plastic pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The service life of an acid anhydride-cured glass steel pipe with an outer diameter of D=85.3mm, a nominal pressure of PN=4Mpa, and a wall thickness of 3.1mm is predicted. The conditions for conveying fluids are shown in Table 1.

[0063] The condition parameter of table 1 embodiment 1 conveying fluid

[0064]

[0065] Specific steps are as follows:

[0066] Step 1: Hydrostatic pressure test, randomly select 18 glass steel pipes in the same batch, and make 18 samples with a pipe body length of 1500mm and a plugged joint at the end, each group is divided into 3 There are 6 groups, the group numbers are 1#, 2#, 3#, 4#, 5#, and 6#, and the hydrostatic pressure test is carried out for each group of pipes. The hydrostatic pressure test conditions are shown in Table 2.

[0067] Table 2 The test condition and burst strength value of embodiment 1 hydrostatic pressure

[0068]

[0069]

[0070] Step 2: Hydrostatic blasting test, according to the standard GB5351 "Fiber...

Embodiment 2

[0084] The service life of an acid anhydride-cured glass steel pipe with an outer diameter of D = 85.3mm, a nominal pressure of PN = 4.0Mpa, and a wall thickness of 3.1mm is predicted. The conditions for conveying fluids are shown in Table 1.

[0085] Steps 1 to 8 are the same as in Example 1.

[0086] Step 9: Pipe life calculation, pipe safety critical pressure P s =f*PN, take f=2.0 here, then P s =f*PN=8.0Mpa, the P s =8.0Mpa into the equation P t =32.19-2.03ln(t), resulting in time t=17 years.

[0087] Therefore, if the safety critical pressure of the pipeline is set to 8.0MPa, the expected life of this batch of glass steel pipes is 17 years at 70°C and the environmental conditions mentioned in Table 1.

Embodiment 3

[0089]The service life of an acid anhydride-cured glass steel pipe with outer diameter D=110mm, nominal pressure PN=3Mpa, and wall thickness h=4mm is predicted. The conditions for conveying fluid are shown in Table 4.

[0090] Specific steps are as follows:

[0091] Step 1: Hydrostatic pressure test, randomly select 12 glass steel pipes in the same batch, and make 12 samples with a pipe body length of 1500mm and a plugged joint at the end, each group is divided into 2 There are 6 groups, the group numbers are 1#, 2#, 3#, 4#, 5#, and 6#, and the hydrostatic pressure test is carried out for each group of pipes. The hydrostatic pressure test conditions are shown in Table 5.

[0092] The condition parameter of table 4 embodiment 3 conveying fluid

[0093]

[0094] Table 5 embodiment 3 hydrostatic pressure test conditions and burst strength value

[0095]

[0096]

[0097] Step 2: Hydrostatic blasting test, according to the standard GB5351 "Fiber Reinforced Thermosetting...

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Abstract

The invention discloses a method for predicting the service life of a glass fiber reinforced plastic pipe. The glass fiber reinforced plastic pipe is subjected to a soaking test. The influence of thecorrosivity of a conveying medium on the service life of the pipe is considered. Tensile strength data of the glass fiber reinforced plastic pipe soaked in the corrosive medium at different times areutilized, a corrosion internal pressure attenuation equation of the glass fiber reinforced plastic pipe is established through a hydrostatic test and a hydraulic bursting test, and on the other hand,the influence of long-term internal pressure borne by the pipe on the pipe bursting strength is considered, a long-term strength and time relation equation of the pipe in a corrosive medium is established, and the service life of the pipe is obtained by setting different safety critical pressure values. The method provided by the invention is established on the basis of test data, the test periodis relatively short, the implementation is convenient, the method is tightly combined with the pipe service condition, and the prediction reliability is high.

Description

technical field [0001] The invention relates to the technical field of pipelines in the petroleum and natural gas industry, in particular to a method for predicting the service life of glass steel pipes. Background technique [0002] With the rapid development of the petroleum and natural industry, a large number of pressure pipes are required in fields such as petroleum and natural gas exploitation, oil and gas gathering, transportation and injection, and sewage treatment. Petroleum and natural gas fluids are generally corrosive to a certain extent, so carbon steel pipelines are often subjected to severe corrosion. Glass steel pipes are non-metallic pipes commonly used in oil and gas fields, and have been widely used in the field of severely corrosive fluid transportation such as crude oil, natural gas, and sewage. [0003] Although FRP pipes have good corrosion resistance, but in the presence of water, H 2 S, CO 2 , Cl - In the gathering and transportation environment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 魏斌齐国权
Owner BC P INC CHINA NAT PETROLEUM CORP
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