CN108460201B - Method for extracting structural parameters of protective flange plate - Google Patents

Method for extracting structural parameters of protective flange plate Download PDF

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CN108460201B
CN108460201B CN201810148703.7A CN201810148703A CN108460201B CN 108460201 B CN108460201 B CN 108460201B CN 201810148703 A CN201810148703 A CN 201810148703A CN 108460201 B CN108460201 B CN 108460201B
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stress
flange plate
flange
determining
bearing
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CN108460201A (en
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李耀华
王红军
邢思玮
杨云涛
张华�
阎毓杰
王楠
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719th Research Institute of CSIC
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Abstract

The invention discloses a method for extracting structural parameters of a protective flange plate, which belongs to the technical field of flange plate structural design, and specifically comprises the following steps: firstly, determining influence factors influencing the stress of the flange plate in the pressure bearing process and the correlation between the influence factors; secondly, determining a reference load bearing and a corresponding reference stress function; then determining a reference stress range meeting the conditions; and finally, determining the inner diameter and the thickness of the flange plate meeting the requirements according to the reference stress range. According to the invention, a scientific design method is provided for determining the inner diameter and the thickness of the flange plate through the mutual relation among the bearing capacity of the flange plate, the yield strength of the material and the inner diameter and the thickness of the flange plate, so that the conformal protection flange plate not only meets the protection performance required by protecting a wellhead radio frequency identification electronic tag reader, but also can reduce the weight and is convenient for field application and popularization.

Description

Method for extracting structural parameters of protective flange plate
Technical Field
The invention relates to a method for extracting structural parameters of a flange plate, in particular to a method for extracting structural parameters of a conformal protective flange plate of a wellhead electronic tag reader during downhole operation in the petroleum industry, and belongs to the technical field of flange plate structural design.
Background
In oil and gas operation production, oil pipe marking and use state recording are being changed from old methods such as steel seal printing and manual recording to intelligent methods. Oil pipes with electronic tags are the mainstream solution at present. The electronic tags are mainly identified by handheld and fixed radio frequency identification electronic tag readers. In order to avoid damaging an electronic tag reader fixed on a wellhead by the weight of tens of tons of an elevator and an oil pipe in the process of descending the oil pipe into the well, a conformal protection flange matched with the reader is required to be installed on the wellhead for protection.
The outer diameter of the conformal protection flange plate of the wellhead electronic tag reader is the same as that of the wellhead blowout preventer, so that the protection flange plate can be prevented from interfering oil field operation, and the conformal protection flange plate is adopted. The variable main structural parameters of the flange plate are thickness and inner diameter, the conventional wellhead conformal flange plate adopts the scheme that the thickness is as thick as possible and the inner diameter is as small as possible to ensure safety, and the flange plate is too heavy, so that great inconvenience is caused to field application. How to design a conformal protection flange disc of a wellhead electronic tag reader considering both protection performance and weight is not solved well.
Disclosure of Invention
In view of the above, the invention provides a method for extracting structural parameters of a protective flange plate, which provides a scientific design method for determining the inner diameter and the thickness of the flange plate through the mutual relationship among the bearing capacity of the flange plate, the yield strength of materials, the inner diameter and the thickness of the flange plate, so that the conformal protective flange plate not only meets the protective performance required by protecting a wellhead electronic tag reader, but also can reduce the weight and is convenient for field application and popularization.
A method for extracting structural parameters of a protective flange plate comprises the following concrete implementation steps:
determining influence factors influencing the stress of the flange plate in the pressure bearing process and a correlation relationship between the influence factors;
step two: determining a reference load bearing and a corresponding reference stress function;
step three, determining a reference stress range meeting the conditions;
step four: and determining the inner diameter and the thickness of the flange plate meeting the requirements according to the reference stress range.
Further, the determination process of the influence factor in the first step is as follows:
the stress analysis of the conformal flange plate can obtain that the influence factors of the stress of the flange plate in the pressure bearing process are three: bearing G, flange thickness H and flange inner diameter D1(ii) a The actual stress of the flange plate is less than the allowable stress of the material; this gives:
Figure BDA0001579425460000021
wherein σiFor flange stress, GiFor actual load-bearing of flanges, RelThe yield strength of the material, k is a safety coefficient, f is a stress function, alpha is a stress function coefficient, and C is a constant;
from ANSYS simulation, under the same condition and only changing the load-bearing G, the stress ratio is equal to the gravity ratio, and the formula (1) can be simplified as follows:
Figure BDA0001579425460000022
wherein G isJIs a reference load bearing, sigmaJFor a reference stress function at a reference load bearing, the known parameter is Rel、k、G。
Further, the reference load bearing and corresponding reference stress function determining process in the second step is as follows:
selecting a suitable reference load bearing GJDetermining the outer diameter D of the conformal flange plate of the parameter required by ANSYS simulation2The width and the height of an interface mounting groove of the RFID reader and the width of a stress surface of a flange disc surface are simulated through ANSYS to obtain the reference stress sigma under different flange disc thicknesses and inner diameter combinationsJ；
To the conformal flange plateFitting data according to the relation between stress and thickness and inner diameter to obtain corresponding reference stress function sigmaJ。
Further, the determination process of the reference stress range satisfying the condition in the third step is as follows:
the conformal flange plate is actually loaded with the load GiMaterial yield strength RelSafety factor k, reference load bearing GJAnd substituting the formula (2) to obtain the reference stress meeting the condition.
Has the advantages that:
according to the method, the mutual relation among the bearing capacity of the wellhead protection flange plate, the yield strength of the material, the inner diameter and the thickness of the flange plate is obtained through ANSYS simulation, a scientific method is provided for determining the structural parameters of the flange plate, and the wellhead conformal protection flange plate not only meets the protection performance required by the protection of an RFID reader, but also can reduce the weight and is convenient to apply and popularize on site.
Drawings
FIG. 1 is a schematic view of a conformal protective flange according to the present invention;
FIG. 2 is a schematic structural view of the inner and outer diameters of the conformal protective flange of the present invention;
1-installing slot for interface of electronic label reader; 2-conformal protective flange.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
As shown in fig. 1 and 2, the invention is directed to a design object of a conformal protective flange 2 for installing an electronic tag reader at a wellhead, the flange is in a hollow ring shape, an electronic tag reader interface installation groove 1 is processed on the bottom surface of the conformal protective flange 2, and the installation groove is a rectangular groove.
The invention provides a method for extracting structural parameters of a protective flange plate, which comprises the following concrete implementation steps:
step one, the flange plate is subjected to stress analysis, and influence factors of the flange plate on the stress magnitude in the pressure bearing process are three: bearing G, flange thickness H and flange inner diameter D1(ii) a For reasons of safety reasons, it is also possible to,the stress generated after the flange bears the load is less than the allowable stress of the material. This gives:
Figure BDA0001579425460000041
wherein σiFor flange stress, GiFor actual load-bearing of flanges, RelTaking the yield strength of the material, taking k as a safety coefficient, taking 1.3-1.5, taking f as a stress function, taking alpha as a stress function coefficient, and taking C as a constant.
All parameters except the load bearing G are set to be constant values, and ANSYS simulation shows that under the same condition and only the load bearing G is changed, the stress ratio is equal to the gravity ratio, namely:
Figure BDA0001579425460000042
wherein G isJIs a reference load bearing, sigmaJAs a function of the baseline stress at the baseline load bearing.
Thus, equation (3) can be simplified as:
Figure BDA0001579425460000043
according to the field situation, the known parameter is Rel、k、G。
Step two, determining reference load bearing and corresponding reference stress function
Selecting a suitable reference load bearing GJAnd ANSYS simulation is convenient to carry out. Parameter conformal flange plate outer diameter D required for determining ANSYS simulation2And the outer diameter of the conformal flange plate is the same as that of the wellhead blowout preventer. Parameters such as the width and the height of the RFID reader interface mounting groove 1, the width of the flange plate surface stress surface and the like are relatively constant values, and the device is suitable for most oil wells. Obtaining the reference stress sigma under different flange plate thickness and inner diameter combinations through ANSYS simulationJAnd drawing a benchmark stress data chart.
The stress of the flange plate varies with the thickness and the inner diameter of the flange plateAnd changing, fitting data of the relation between the stress of the conformal flange plate and the thickness and the inner diameter to obtain a corresponding reference stress function sigmaJ。
Step three, determining the reference stress range meeting the conditions
The conformal flange plate is actually loaded with the load GiMaterial yield strength RelSafety factor k, reference load bearing GJAnd substituting the formula (5) to obtain the reference stress meeting the condition.
And step four, determining the inner diameter and the thickness of the flange plate meeting the requirements according to the reference stress range.
The reference stress range which is not larger than a certain value can be obtained in the third step, according to the range, a plurality of combinations of the inner diameter and the thickness of the flange plate which meet the requirements are provided, in order to improve the applicability of the conformal flange plate, according to the field condition of the oil field, the thickness of the flange plate is designed into n step values, each step value of the thickness of the flange plate corresponds to the corresponding inner diameter of the flange plate, each group of data has a corresponding adaptive range, the combinations are screened according to additional conditions (the height of an electronic tag reader, the installation space of a well head and the size of a cable interface), and finally the inner diameter and the thickness of the conformal flange plate which meet the design requirements and the field requirements are determined.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. A method for extracting structural parameters of a protective flange is characterized by comprising the following concrete implementation steps:
determining influence factors influencing the stress of the flange plate in the pressure bearing process and a correlation relationship between the influence factors;
step two: determining a reference load bearing and a corresponding reference stress function;
step three, determining a reference stress range meeting the conditions;
step four: determining the inner diameter and the thickness of the flange plate meeting the requirements according to the reference stress range;
the determination process of the influence factor in the first step is as follows:
the stress analysis of the conformal flange plate can obtain that the influence factors of the stress of the flange plate in the pressure bearing process are three: bearing G, flange thickness H and flange inner diameter D1(ii) a The actual stress of the flange plate is less than the allowable stress of the material; this gives:
Figure FDA0003105696960000011
wherein σiFor flange stress, GiFor actual load-bearing of flanges, RelThe yield strength of the material, k is a safety coefficient, f is a stress function, alpha is a stress function coefficient, and C is a constant;
from ANSYS simulation, under the same condition and only changing the load-bearing G, the stress ratio is equal to the gravity ratio, and the formula (1) can be simplified as follows:
Figure FDA0003105696960000012
wherein G isJIs a reference load bearing, sigmaJFor a reference stress function at a reference load bearing, the known parameter is Rel、k、G。
2. The method for extracting parameters of a protective flange structure according to claim 1, wherein the reference load-bearing and corresponding reference stress function determination process in the second step is as follows:
selecting a suitable reference load bearing GJDetermining the outer diameter D of the conformal flange plate of the parameter required by ANSYS simulation2The width and the height of the RFID reader interface mounting groove and the width of the flange face stress surface are obtained through ANSYS simulation, and the reference stress sigma under different flange thickness and inner diameter combinations is obtainedJ；
Stress and thickness to conformal flangeAnd fitting data according to the relation of the inner diameter to obtain a corresponding reference stress function sigmaJ。
3. The method for extracting parameters of a protective flange structure according to claim 2, wherein the determination process of the reference stress range satisfying the condition in the third step is as follows:
the conformal flange plate is actually loaded with the load GiMaterial yield strength RelSafety factor k and reference load bearing GJAnd substituting the formula (2) to obtain the reference stress meeting the condition.
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CN102052995A (en) * 2010-10-29 2011-05-11 华东理工大学 Safe evaluating method for pressure vessel after short-time firing
CN103514327A (en) * 2013-09-27 2014-01-15 国家电网公司 Finite element parametric modeling method of power transmission steel pipe pole
CN104279974A (en) * 2014-09-28 2015-01-14 中国船舶重工集团公司第七一九研究所 Split type optic fiber strain sensor assembly
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