CN108897922B - Groove analysis method for formation of steel catenary riser contact area - Google Patents

Groove analysis method for formation of steel catenary riser contact area Download PDF

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CN108897922B
CN108897922B CN201810589562.2A CN201810589562A CN108897922B CN 108897922 B CN108897922 B CN 108897922B CN 201810589562 A CN201810589562 A CN 201810589562A CN 108897922 B CN108897922 B CN 108897922B
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李英
李婧一
吴子昂
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Tianjin University
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Abstract

The invention discloses a method for analyzing a groove formed in a steel catenary riser touch-down point area, which comprises the following steps: determining a suggested value of a nonlinear soil parameter for accelerating the formation of a groove; calculating the shape of the groove under different working conditions according to the suggested value of the nonlinear soil parameter for accelerating the formation of the groove, and determining the groove shape formula by regression analysis of the groove shape formula. The method can realize the analysis of the groove formed in the contact area of the steel catenary riser; through numerical simulation of trench formation under the action of pipe soil, a rapid trench formation method containing specific coefficient suggested values is provided; and (3) providing a groove shape regression formula based on finite element calculation so as to perform fatigue analysis on the opposite pipe touchdown region of the groove.

Description

Groove analysis method for formation of steel catenary riser contact area
Technical Field
The invention relates to an analysis method, in particular to a groove analysis method formed in a steel catenary riser touch spot area.
Background
The steel pipes hung between the platform and the seabed facility form a steel catenary riser, the riser is in a catenary shape, and the steel catenary riser is freely hung outside the platform by utilizing a flexible joint and is connected with the platform, so that the traditional two devices of hydraulic and pneumatic tensioning and bridging are omitted, and the space of the platform is more sufficient. The steel catenary riser has the advantages of low cost, larger tolerance of drifting and heave motions for a floating platform, no top tension compensation at all, and better suitability for working in a high-pressure and high-temperature medium environment.
The touchdown point is the location where the riser first makes contact with the seabed and is the intersection of the catenary section and the flowline section. When the upper floating body drives the stand pipe to move under the action of sea waves, the suspended pipeline on one side of the touchdown point can gradually contact with the seabed soil body, a new touchdown point can be generated in the whole contact process, and an area with a certain length is formed when the position of the touchdown point is changed, so that the touchdown area is called. Due to frequent soil-in-pipe interactions in the touchdown area, greater bending stresses will be generated, more likely causing fatigue failure. The interaction of the riser with the seabed in the touchdown region should therefore be studied with great emphasis.
The rigidity of the soil body is attenuated due to the frequent action of the steel catenary riser and the soil body in the bottoming area, the soil body is subjected to plastic deformation and liquefaction, and then the liquid soil body in the grounding area is flushed out by seawater and a groove is gradually formed. The development of the basic theoretical research of the seabed trench has very important significance on the design and fatigue analysis of the steel catenary riser. Because uncertain factors are too many in the forming process of the groove, the resistance and suction of the soil body to the stand pipe are more complex, and therefore the groove has great influence on the dynamic response of the steel catenary stand pipe in the grounding area. If a research about the problems of the steel catenary riser in the grounding area needs to be carried out, the influence of the groove on the pipe-soil effect needs to be researched, and the forming process of the groove needs to be researched.
The calculation time for simulating the groove by adopting the conventional method is too long, so that the influence of different parameters on the shape of the groove needs to be researched, and a parameter suggestion value for accelerating the groove formation is provided so as to determine the method for quickly forming the groove.
The shape of the groove can be changed according to different environmental loads, but a groove shape formula with universality needs to be derived so as to directly analyze the fatigue influence of the groove on the riser when the steel catenary riser is designed and perfect the overall design process of the riser.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for analyzing a groove formed in a steel catenary riser contact area, so that the groove formed in the steel catenary riser contact area can be analyzed; through numerical simulation of trench formation under the action of pipe soil, a rapid trench formation method containing specific coefficient suggested values is provided; and (3) providing a groove shape regression formula based on finite element calculation so as to perform fatigue analysis on the opposite pipe touchdown region of the groove.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a method for analyzing a groove formed in a contact area of a steel catenary riser, which comprises the following steps of:
determining a suggested value of a nonlinear soil parameter for accelerating the formation of a groove:
1) establishing a model of a steel catenary riser, a floating body and a seabed system, namely a riser-groove model, by using Orcaflex;
2) researching nonlinear soil parameters by adopting a variable control mode, wherein each calculation working condition only changes one effective parameter in the nonlinear soil parameters compared with a basic working condition, and determining the influence of the nonlinear soil parameters on the shape of the groove by comparing calculation results; wherein the nonlinear soil parameter comprises a suction proportionality coefficient fsucRe-embedding coefficient lambdarepSuction attenuation coefficient lambdasuc；
3) Respectively carrying out dynamic response analysis on the riser-groove model under the calculation conditions of different values of the nonlinear soil parameters, extracting the numerical value of the groove embedding depth, selecting the optimal value of the nonlinear soil parameters according to the maximum value of the embedding depth, and taking the optimal value as the suggested value of the nonlinear soil parameters for accelerating the formation of the groove;
step two, calculating the shape of the groove under different working conditions according to the suggested value of the nonlinear soil parameter for accelerating the formation of the groove, and performing regression analysis on a groove shape formula to determine the groove shape formula:
1) assuming the trench shape equation is:
Figure BDA0001690207500000021
wherein, a1、a2、a3Are all λ ═ Lmax/LTMultiple term function equation of (2), LmaxHorizontal distance, L, from the starting point of the trench to the point of maximum embedding depthTThe horizontal distance from the starting point of the trench to the end point of the trench, dmaxIs the maximum depth of embedding of the trench,
Figure BDA0001690207500000031
the horizontal distance from the description point to the starting point of the trench is shown,
Figure BDA0001690207500000032
is the embedding depth describing the point correspondence;
2) aiming at the riser-groove model, by changing the water depth delta z, the outer diameter D and the wall thickness w of the risertAngle of suspension thetaHOShear strength variation gradient parameter rho and soil surface layer shear strength su0Setting different working conditions according to the heave H parameter value;
3) performing dynamic analysis on the set riser-groove models under different working conditions, and extracting the value of groove depth embedding;
4) and (3) carrying out data processing on any one of the set different working conditions:
drawing a groove embedding depth curve according to an assumed groove shape formula (the horizontal distance is an abscissa, and the embedding depth is an ordinate), wherein the expression is as follows:
y＝a1x3+a2x2+a3x
Figure BDA0001690207500000033
Figure BDA0001690207500000034
wherein, the definition domain of x is [0,1], and the value domain of y is [0,1 ];
performing cubic curve fitting on the groove shape data after finishing the finishing, wherein a constant term is ensured to be 0 in the fitting process, and three coefficient terms before x in the fitting curve formula correspond to a in the formula1、a2、a3
5) Repeating the step 4) to process the data of all different working conditions, and recording the corresponding lambda (namely L) under each working conditionmax/LT)、a1、a2、a3A value;
6) a under all different working conditions1- λ is summarized in a scatter plot, fitting a according to the scatter data1And a parameter equation of lambda is obtained by adopting the mode of upper boundary data fitting, total data fitting and lower boundary data fitting1To determine a by fitting a curve to the three data1The corresponding relation between the obtained data and the lambda;
7) sequentially processing a in the same manner as the step 6) above2-λ、a3Lambda data, respectively a2Three data fitting curves and a3Fitting a curve to the three data; according to a1、a2、a3Fitting the curve to obtain the unknown quantity a1、a2、a3Substituting the value of (2) into the groove shape formula assumed in the step 1) to obtain a complete form of the groove shape formula.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) according to the method, the influence of different nonlinear soil parameters on the trench is researched by a control variable method, so that the suggested value of the specific coefficient during rapid trench simulation is obtained, support is provided for the dynamic response analysis of the stand pipe, and the problem of long calculation time is solved.
(2) According to the groove shape formula considering the self weight of the pipeline, the dynamic response analysis of the groove in the opposite pipe grounding area can be directly analyzed when the steel catenary riser is designed, and the overall design process of the riser is perfected.
(3) The groove shape formula considering the self weight of the pipeline has the advantages that: the initial point of the groove passes through the original point, the constant term of the parameter equation is 0, one undetermined coefficient is reduced, and the precision of other three coefficients can be improved within a certain range. Calculating the shape of the groove under various working conditions by using a groove rapid forming method, and performing regression analysis of a groove shape formula according to the calculation result to determine the undetermined coefficient a1、a2、a3To obtain an exact trench shape equation.
Drawings
FIG. 1 is a typical riser-trench model;
FIG. 2 is a characteristic section of a steel catenary riser;
FIG. 3 is a graph of trench embedding depth;
FIG. 4 is a graph of groove shape data processing and curve fitting;
FIG. 5 is a1-scatter summary of λ;
FIG. 6 is a1Three fitted curves of (a);
FIG. 7 is a2Three fitted curves of (a);
FIG. 8 is a3Three fitted curves of (2).
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention discloses a groove analysis method for forming a steel catenary riser touchdown point area, which provides a groove rapid forming method containing concrete coefficient suggested values and an analysis method for obtaining a groove shape regression formula based on finite element calculation through numerical simulation of groove forming under the action of pipe soil.
The invention discloses a method for analyzing a groove formed in a steel catenary riser touch-down point area, which comprises the following specific processes:
firstly, because the calculation time for simulating the groove by adopting the conventional method is too long, the influence of different parameters on the shape of the groove is researched, and a suggested value for accelerating the nonlinear soil parameter for forming the groove is provided.
1) Orcaflex was used to model a typical steel catenary riser, buoy and seabed system, i.e., riser-trench model, as shown in fig. 1. The characteristic section of the steel catenary riser is shown in fig. 2.
2) The nonlinear soil parameters are researched in a variable control mode, each calculation working condition only changes one effective parameter in the nonlinear soil parameters compared with the basic working condition, and the influence of the nonlinear soil parameters on the groove shape is determined by comparing calculation results.
Wherein the nonlinear soil parameters may affect the formation of the trench in the seabed by the steel catenary riserCoefficient of proportionality of suction force fsucRe-embedding coefficient lambdarepSuction attenuation coefficient lambdasuc. Coefficient of suction ratio fsucControlling ultimate suction force Pu-suc(z) the value range is 0 to +/-infinity, and 0 to 0.3 is generally adopted when the dynamic response analysis is carried out. Re-embedding coefficient lambdarepThe distance of riser embedding when controlling the riser and reaching maximum soil resistance generally takes the value to be 0.1 ~ 0.5, and the value is big more then the degree of depth of embedding big more. Coefficient of attenuation of suction lambdasucThe acting distance of the soil suction in the unloading and lifting process of the vertical pipe is influenced, the value range is 0.2-0.6, and the value can ensure that the soil body suction borne by the vertical pipe when the vertical pipe moves upwards for more than one diameter distance is extremely small.
3) Under various calculation conditions of different values of the nonlinear soil parameters, respectively carrying out dynamic response analysis on the riser-groove model, extracting the numerical value of the groove embedding depth, and selecting the optimal value of the nonlinear soil parameters according to the maximum value of the embedding depth to serve as the suggested value of the nonlinear soil parameters for accelerating the formation of the groove. When the dynamic response analysis of the riser-groove model is carried out, the fatigue damage of the riser in the groove forming period can be ignored, and only the fatigue influence of the riser after the groove shape is stable is considered.
And secondly, calculating the shape of the groove under different working conditions according to the suggested value of the nonlinear soil parameter for accelerating the formation of the groove, performing regression analysis on a groove shape formula according to the calculation result, and determining a groove shape calculation formula based on finite element calculation.
1) The existing trench shape formula is the polynomial trench shape equation proposed by Aubeny:
Figure BDA0001690207500000051
wherein L isTIs the horizontal distance, L, from the starting point of the groove to the end point of the groovemaxHorizontal distance, d, from the starting point of the trench to the point of maximum embedding depthmaxIs the maximum depth of embedding of the trench,
Figure BDA0001690207500000061
the horizontal distance from the description point to the starting point of the trench is shown,
Figure BDA0001690207500000062
is to describe the embedding depth of the point correspondences.
However, the above formula does not consider the influence of the self weight of the pipeline, and now it is assumed that the formula of the groove shape is:
Figure BDA0001690207500000063
wherein, a1、a2、a3Are all λ ═ Lmax/LTMultiple term function equations of (1).
2) Aiming at the riser-groove model, by changing the water depth delta z, the outer diameter D and the wall thickness w of the risertAngle of suspension thetaHOShear strength variation gradient parameter rho and soil surface layer shear strength su0And the values of the parameters such as the heave H and the like set various different working conditions.
3) And (4) carrying out dynamic analysis on the set riser-groove model under various different working conditions, and extracting the value of groove depth embedding.
4) And for any one of the set different working conditions, performing data processing according to the following steps:
drawing a groove embedding depth curve (horizontal distance is an abscissa and embedding depth is an ordinate) according to an assumed groove shape formula, and in order to intuitively derive three unknown coefficients a1、a2、a3The expression is:
Figure BDA0001690207500000064
wherein, the definition domain of x is [0,1], and the value domain of y is [0,1 ].
Performing cubic curve fitting on the groove shape data after finishing the finishing, wherein a constant term is ensured to be 0 in the fitting process, and three coefficient terms before x in the fitting curve formula correspond to a in the formula1、a2、a3。
5) Repeating the step 4) and performing similar processing on the data of all different working conditions by adopting VB programming, and recording the corresponding lambda (namely L) under each working conditionmax/LT)、a1、a2、a3The value is obtained.
6) Study of lambda and a1、a2、a3The relationship (2) of (c). A under all different working conditions1The lambda data are summarized in a scatter plot. Fitting a from scatter data1And a parametric equation for λ. Within the distribution interval of lambda1The values of (a) are not completely concentrated, so a mode of upper boundary data fitting-total data fitting-lower boundary data fitting is adopted to obtain a1To determine a by fitting a curve to the three data1And λ.
7) Sequentially processing a in the same manner as the step 6) above2-λ、a3Lambda data, respectively a2Three data fitting curves and a3The three data of (2) were fitted to a curve. According to a1、a2、a3Fitting the curve to obtain the unknown quantity a1、a2、a3Substituting the value of (2) into the groove shape formula assumed in the step 1) to obtain a complete form of the groove shape formula.
The specific embodiment is as follows:
firstly, because the calculation time for simulating the groove by adopting the conventional method is too long, the influence of different parameters on the shape of the groove is researched, and a suggested value for accelerating the nonlinear soil parameter for forming the groove is provided.
1) Orcaflex was used to model steel catenary risers, floats, and seabed systems, i.e., riser-trench models.
2) The nonlinear soil parameters are researched in a variable control mode, each calculation working condition only changes one effective parameter in the nonlinear soil parameters compared with the basic working condition, and the influence of the nonlinear soil parameters on the groove shape is determined by comparing calculation results.
3) Under various calculation conditions of different values of the nonlinear soil parameters, respectively carrying out dynamic response analysis on the riser-groove model, extracting the numerical value of the groove embedding depth, and selecting the optimal value of the nonlinear soil parameters according to the maximum value of the embedding depth to serve as the suggested value of the nonlinear soil parameters for accelerating the formation of the groove.
And secondly, calculating the shape of the groove under different working conditions according to the suggested value of the nonlinear soil parameter for accelerating the formation of the groove, and performing regression analysis on a groove shape formula according to the calculation result to determine a mathematical formula for calculating the groove shape.
1) The trench shape equation is assumed to be the above equation (2).
2) Aiming at the riser-groove model, by changing the water depth delta z, the outer diameter D and the wall thickness w of the risertAngle of suspension thetaHOShear strength variation gradient parameter rho and soil surface layer shear strength su0And the values of the parameters such as the heave H and the like set various different working conditions.
3) And (4) carrying out dynamic analysis on the set riser-groove model under various different working conditions, and extracting the value of groove depth embedding.
4) And for any one of the set different working conditions, performing data processing according to the following steps:
drawing a groove embedding depth curve (horizontal distance is an abscissa and embedding depth is an ordinate) according to an assumed groove shape formula, and in order to intuitively derive three unknown coefficients a, as shown in FIG. 31、a2、a3The expression is the above formula (3).
Performing cubic curve fitting on the groove shape data after finishing the processing, as shown in fig. 4, ensuring that a constant term is 0 in the fitting process, and corresponding three coefficient terms before x in the fitting curve formula to a in the formula1、a2、a3。
5) Repeating the step 4) and performing similar processing on the data of all different working conditions by adopting VB programming, and recording the corresponding lambda (namely L) under each working conditionmax/LT)、a1、a2、a3The value is obtained.
6) Study of lambda and a1、a2、a3The relationship (2) of (c). All the working conditions are differenta1The lambda data are summarized in a scatter plot as in FIG. 5. Fitting a from scatter data1And a parametric equation for λ. Within distribution interval of lambda1The values of (a) are not completely concentrated, so a mode of upper boundary data fitting-total data fitting-lower boundary data fitting is adopted to obtain a1To determine a by fitting a curve to the three data, as shown in FIG. 61And λ.
When the upper and lower boundary data are selected, the value range of lambda is evenly divided into 300 parts within 0.05-0.65, all the data are distributed in 300 groups, after abnormal points in each group of data are removed, the maximum or minimum a in each group of data is selected1The values thus result in 300 maximum and minimum data points. The original fitting curve of the upper and lower boundary curves is composed of the 300 groups of data points, and then the upper and lower boundary curves are fitted by adopting a quadratic parameter equation. The total data fitting curve is the fitting result after limited data outliers are removed.
7) Sequentially processing a in the same manner as the step 6) above2-λ、a3Lambda data, respectively a2Three data fitting curves and a3The three data of (2) were fitted to curves, as in fig. 7 and 8.
Three groups of coefficient formulas are obtained through the data processing mode, wherein the result of the upper boundary data is as follows:
Figure BDA0001690207500000081
all data results were:
Figure BDA0001690207500000091
the lower bound data results are:
Figure BDA0001690207500000092
according to a1、a2、a3Fitting the curve to obtain the unknown quantity a1、a2、a3Substituting the value of (2) into the groove shape formula assumed in the step 1) to obtain a complete form of the groove shape formula.
While the present invention has been described in terms of its functions and operations with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise functions and operations described above, and that the above-described embodiments are illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined by the appended claims.

Claims (1)

1. A method for analyzing a trench formed in a steel catenary riser touchdown area, comprising the steps of:
determining a suggested value of a nonlinear soil parameter for accelerating the formation of a groove:
1) establishing a model of a steel catenary riser, a floating body and a seabed system, namely a riser-groove model, by using Orcaflex;
2) researching nonlinear soil parameters by adopting a variable control mode, wherein each calculation working condition only changes one effective parameter in the nonlinear soil parameters compared with a basic working condition, and determining the influence of the nonlinear soil parameters on the shape of the groove by comparing calculation results; wherein the nonlinear soil parameter comprises a suction proportionality coefficient fsucRe-embedding coefficient lambdarepSuction attenuation coefficient lambdasuc；
3) Respectively carrying out dynamic response analysis on the riser-groove model under the calculation conditions of different values of the nonlinear soil parameters, extracting the numerical value of the groove embedding depth, selecting the optimal value of the nonlinear soil parameters according to the maximum value of the embedding depth, and taking the optimal value as the suggested value of the nonlinear soil parameters for accelerating the formation of the groove;
step two, calculating the shape of the groove under different working conditions according to the suggested value of the nonlinear soil parameter for accelerating the formation of the groove, and determining a groove shape formula by regression analysis of the groove shape formula:
1) assuming the trench shape equation is:
Figure FDA0003501347640000011
wherein, a1、a2、a3Are all λ ═ Lmax/LTMultiple term function equation of (2), LmaxHorizontal distance, L, from the starting point of the trench to the point of maximum embedding depthTThe horizontal distance from the starting point of the trench to the end point of the trench, dmaxIs the maximum depth of embedding of the trench,
Figure FDA0003501347640000012
the horizontal distance from the description point to the starting point of the trench is shown,
Figure FDA0003501347640000013
is the embedding depth describing the point correspondence;
2) aiming at the riser-groove model, by changing the water depth delta z, the outer diameter D and the wall thickness w of the risertAngle of suspension thetaHOShear strength variation gradient parameter rho and soil surface layer shear strength su0Setting different working conditions according to the heave H parameter value;
3) performing dynamic analysis on the set riser-groove models under different working conditions, and extracting the value of groove depth embedding;
4) and (3) carrying out data processing on any one of the set different working conditions:
drawing a groove embedding depth curve according to an assumed groove shape formula, wherein the horizontal distance is an abscissa, the embedding depth is an ordinate, and the expression is as follows:
y＝a1x3+a2x2+a3x
Figure FDA0003501347640000021
Figure FDA0003501347640000022
wherein, the definition domain of x is [0,1], and the value domain of y is [0,1 ];
performing cubic curve fitting on the groove shape data after finishing the finishing, wherein a constant term is ensured to be 0 in the fitting process, and three coefficient terms before x in the fitting curve formula correspond to a in the formula1、a2、a3
5) Repeating the step 4) to process the data of all different working conditions, and recording the corresponding lambda and a under each working condition1、a2、a3A value of λ Lmax/LT；
6) A under all different working conditions1- λ is summarized in a scatter plot, fitting a according to the scatter data1And a parameter equation of lambda is obtained by adopting the mode of upper boundary data fitting, total data fitting and lower boundary data fitting1To determine a by fitting a curve to the three data1The corresponding relation between the obtained data and the lambda;
7) sequentially processing a in the same manner as the step 6) above2-λ、a3Lambda data, respectively a2Three data fitting curves and a3Fitting a curve to the three data; according to a1、a2、a3Fitting the curve to obtain the unknown quantity a1、a2、a3Substituting the value of (2) into the groove shape formula assumed in the step 1) to obtain a complete form of the groove shape formula.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102141462A (en) * 2010-12-31 2011-08-03 中国海洋石油总公司 Grounding vibration experimental method and system of steel catenary riser
CN103902754A (en) * 2012-12-28 2014-07-02 浙江海洋学院 Deep sea steel catenary vertical pipe touchdown point power response analyzing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102141462A (en) * 2010-12-31 2011-08-03 中国海洋石油总公司 Grounding vibration experimental method and system of steel catenary riser
CN103902754A (en) * 2012-12-28 2014-07-02 浙江海洋学院 Deep sea steel catenary vertical pipe touchdown point power response analyzing method

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
A simple parametric formulation for the seabed trench profile beneath a steel catenary riser;Kunpeng Wang等;《Marine Structures》;20160131;第45卷;22-42 *
深水钢悬链线立管与海床间的相互作用研究;彭芃;《中国优秀硕士学位论文全文数据库基础科学辑》;20140815;A010-73 *
环境荷载对钢悬链线立管影响的参数研究;覃振东;《中国优秀硕士学位论文全文数据库基础科学辑》;20160515;A010-21 *

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