CN105975671B - Fracturing work high pressure pipe joint union connection structure and the strength calculation method of screw thread - Google Patents
Fracturing work high pressure pipe joint union connection structure and the strength calculation method of screw thread Download PDFInfo
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- CN105975671B CN105975671B CN201610283817.3A CN201610283817A CN105975671B CN 105975671 B CN105975671 B CN 105975671B CN 201610283817 A CN201610283817 A CN 201610283817A CN 105975671 B CN105975671 B CN 105975671B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention discloses a kind of fracturing work high pressure pipe joint union connection structure and the strength calculation methods of screw thread, the present invention is modeled by existing finite element software, define each component materials attribute and boundary condition, it is calculated under different thread interference amounts between internal and external threads and the stress cloud atlas of contact face, and thread interference amount and torque wrench moment relation curve are gone out by theory deduction, in conjunction with the torque wrench moment of practical measurement, high pressure pipe joint union connection structure and the intensity of screw thread under corresponding thread interference amount is calculated.The present invention has fully considered high pressure pipe joint union connection structure and the synthesis stress condition of screw thread under practical torque wrench moment, union connection structure and screw thread rationally, accurately simulate, it can be widely applied under fracturing work provide a kind of reliable foundation for the design and use of fracturing work high pressure pipe joint union connection structure and screw thread during union connection structure and screw strength calculate.
Description
Technical field
The present invention relates to petroleum, construction of natural gas fields technical field, and in particular, to a kind of fracturing work high pressure pipe joint by
The strength calculation method of nonyl connection structure and screw thread.
Background technique
High pressure pipe joint is the major product for petroleum industry trandfer fluid, the important angle of performer during fracturing work
Color, the union connection structure used have many advantages, such as that easily replacement, pressure-bearing is high, leakproofness is excellent.However in recent years, with pressure break
The promotion of operation technique technology, internal fluid pressure is constantly soaring, because of artificial torque wrench moment when existing high pressure pipe joint union connects
Difference, cause connection screw thread stress different, so that the bonding strength of union has differences, cause high pressure pipe joint conveying high-pressure stream
Body safety cannot ensure, it is easy to accident occur.Therefore, to the stress distribution of high pressure pipe joint union connection structure and screw thread
It is studied, finds the relationship of torque wrench moment and bonding strength, specification torque wrench moment is the pass for promoting high pressure pipe joint service performance
Key.
It is most of at present to the usual way of high pressure pipe joint union connection structure and Design of Screw Thread be according to pressure limit simultaneously
Selected with reference to U.S.'s ASME B1.5-ACME thread standard, recycle theoretical empirical formula to high pressure pipe joint union connection structure and
The Force Calculation of screw thread, and evaluate its service performance.The influence of torque wrench moment and torque difference is not accounted for, not to whole union
Connection structure and screw thread carry out strength check.
Summary of the invention
The purpose of the present invention is being directed to technological deficiency existing in the prior art, provide a kind of more reasonable, more accurate
Fracturing work high pressure pipe joint union connection structure and the strength calculation method of screw thread preferably reflect practical torque wrench moment operating condition
The stress characteristics of lower high pressure pipe joint union connection structure and screw thread, the use to high pressure pipe joint union connection structure and screw thread is improved
Performance, the service life for extending high pressure pipe joint reduce operating cost and improve operator's life security with highly important
Meaning.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of fracturing work high pressure pipe joint union connection structure and the strength calculation method of screw thread, comprising the following steps:
Step 1: union is connected after carrying out elastic conjunction to union connection screw thread component according to the thread interference amount of setting
The geometrical model for connecing screwed part and its associated part is converted into two-dimensional axial symmetric model, imports in finite element software to union
Connection screw thread component and its associated part carry out grid dividing, obtain finite element mesh model；
Step 2: definition material attribute, the material properties include union connection screw thread component and its associated part
Elasticity modulus, Poisson's ratio, yield stress and the ultimate strength of material；
Step 3: applying corresponding load boundary and restrained boundary item to finite element mesh model obtained in step 1
Part obtains finite element model, wherein the load boundary includes that the screw thread of the threaded connection part of union connection screw thread component is pre-
Fluid pressure that the inner flow passage wall of clamp force, public union and female union is born, the threaded pre-tightening power in step 1 by setting
Thread interference amount contacts module by the model in finite element software to control；The restrained boundary condition includes female union and the wing
Between the CONTACT WITH FRICTION relationship between CONTACT WITH FRICTION relationship, wing nut and retaining ring, retaining ring and public union between shape nut
Bind the CONTACT WITH FRICTION relationship between contact relation, public union and female union；
Step 4: finite element model obtained in step 3 is solved in finite element software, obtain and step 1
The stress distribution cloud atlas of the corresponding union connection structure of the thread interference amount of middle setting；
Step 5: obtaining the female union and wing spiral shell under the thread interference amount set in step 1 by stress distribution cloud atlas
Contact force and retaining ring between female screw thread are to the contact force of wing nut compression face, then the spiral shell by setting in step 1
The contact of female union under line magnitude of interference and the contact force between the screw thread of wing nut and retaining ring to wing nut compression face
Power calculates corresponding torque wrench moment value；
Step 6: changing the step the thread interference amount set in one, step 1 is repeated to step 5, obtains different screw thread mistakes
Torque wrench moment value under the amount of being full of draws the graph of relation between thread interference amount and torque wrench moment value, passes through thread interference amount
Graph of relation between torque wrench moment value obtains thread interference amount corresponding to practical torque wrench moment value, then actually to detain
Thread interference amount corresponding to torque value repeats step 1 to step 4, obtains as the thread interference amount set in step 1
The stress distribution cloud atlas of union connection structure corresponding with thread interference amount corresponding to practical torque wrench moment value, to obtain
With high pressure pipe joint union connection structure and screw strength corresponding to practical torque wrench moment value.
Preferably, in the strength calculation method for splitting operation high pressure pipe joint union connection structure and screw thread, institute
It states in step 1 and grid is carried out using Plane77 unit to union connection screw thread component and its associated part progress grid dividing
It divides, grid cell size is 1mm, and especially encrypts to the threaded connection Partial Mesh of union connection screw thread component.
Preferably, in the strength calculation method for splitting operation high pressure pipe joint union connection structure and screw thread, institute
The contact force between the female union under the thread interference amount for passing through in step 5 and setting in step 1 and the screw thread of wing nut is stated,
And the calculation formula that retaining ring calculates corresponding torque wrench moment value to the contact force of wing nut compression face is as follows:
T=T1+T2
Wherein, T1Indicate the female union under the thread interference amount set in step 1 and the screw thread torque value of wing nut；T2
Indicate the retaining ring under the thread interference amount set in step 1 to the torque value of wing nut compression face；
T1Calculation formula it is as follows:
F ' indicates the contact force between the female union under the thread interference amount set in step 1 and the screw thread of wing nut,
And retaining ring is to the axial resultant force of the contact force of wing nut compression face；d1Indicate the pitch diameter of thread of female union and wing nut；
Indicate the lead angle of female union and wing nut；The screw thread equivalent friction angle of ρ expression female union and wing nut；
T2Calculation formula it is as follows:
μ indicates the retaining ring under the thread interference amount set in step 1 to the coefficient of friction at wing nut compression face；D table
Show retaining ring to the maximum gauge of wing nut compression face；d2Indicate retaining ring to the minimum diameter of wing nut compression face.
Preferably, in the strength calculation method for splitting operation high pressure pipe joint union connection structure and screw thread, institute
The thread interference amount set in step 1 is stated as 0~0.08mm.
Preferably, in the strength calculation method for splitting operation high pressure pipe joint union connection structure and screw thread, institute
Stating μ is 0.15.
Preferably, in the strength calculation method for splitting operation high pressure pipe joint union connection structure and screw thread, institute
It is actually measured by live torque spanner to state practical torque wrench moment value in step 6.The present invention is include at least the following beneficial effects:
Rationally, accurately, analysis calculates quickly high pressure pipe joint union connection screw thread strength calculation method of the invention；It can
Meet union connection screw thread strength check under practical torque wrench moment, accurately expresses the practical feelings that high pressure pipe joint is threadedly coupled
Condition.The calculation method is simple and practical, provides the reliability of fracturing work high pressure pipe joint union connection screw thread design.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is the schematic diagram of high pressure pipe joint union connection structure of the present invention；
Fig. 2 is the schematic diagram of two-dimensional axial symmetric model of the present invention；
Graph of relation of the Fig. 3 between thread interference amount of the present invention and torque wrench moment.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, to enable those skilled in the art's reference
Specification word can be implemented accordingly.
Embodiment 1
As shown in Figure 1 to Figure 3, a kind of fracturing work high pressure pipe joint union connection structure and the Strength co-mputation side of screw thread
Method, comprising the following steps:
Step 1: first presetting a thread interference amount 0.07mm to 105MPa according to thread interference amount initially set
After high pressure pipe joint union connection screw thread component, i.e. female union 4 and wing nut 3 carry out elastic conjunction, as shown in Fig. 2, by union
Connection screw thread component and its associated part, i.e. female union 4, wing nut 3, retaining ring 2 and public union 1 geometrical model be converted into
Two-dimensional axial symmetric model imports in finite element software and carries out grid dividing using Plane77 unit to all components, defines union
The grid cell size of connection screw thread component and its associated part is 1mm, and the screw thread especially to union connection screw thread component
Coupling part mesh refinement.
Step 2: defining the material properties of union connection screw thread component and its associated part, wherein elasticity modulus is
200GPa, Poisson's ratio 0.3, yield stress are 930MPa and ultimate strength is 1080MPa.
Step 3: applying corresponding load boundary and restrained boundary condition to finite element mesh model, finite element mould is obtained
Type, wherein the load boundary includes threaded pre-tightening power, male union and the mother of the threaded connection part of union connection screw thread component
The Fluid pressure that the inner flow passage wall of union is born, threaded pre-tightening power are soft by finite element by the thread interference amount 0.07mm set
Model contact module in part controls, i.e., by thread interference amount 0.07mm by the model in finite element software contact module into
Row, which calculates, can obtain corresponding threaded pre-tightening power, and the Fluid pressure that the inner flow passage wall of public union and female union is born is
105MPa；The restrained boundary condition includes CONTACT WITH FRICTION relationship, wing nut and the retaining ring between female union and wing nut
Between CONTACT WITH FRICTION relationship, the binding contact relation between retaining ring and public union, the friction between public affairs union and female union connect
Touching relationship；Wherein, retaining ring under the thread interference amount 0.07mm set is to the coefficient of friction at wing nut compression face as 0.15.
Step 4: finite element model is solved in finite element software, obtain corresponding with the thread interference amount 0.07mm of setting
Union connection structure stress distribution cloud atlas.
Step 5: by stress distribution cloud atlas obtain female union under the thread interference amount 0.07mm set in step 1 and
Contact force and retaining ring between the screw thread of wing nut are to the contact force of wing nut compression face, then the screw thread by setting
Female union under magnitude of interference 0.07mm and the contact force between the screw thread of wing nut and retaining ring are to wing nut compression face
The calculation formula that contact force calculates corresponding torque wrench moment value (total friction torque) is as follows:
T=T1+T2
Wherein, T1Indicate the female union under the thread interference amount 0.07mm of setting and the screw thread torque value of wing nut；T2Table
Show the retaining ring under the thread interference amount 0.07mm of setting to the torque value of wing nut compression face；
T1Calculation formula it is as follows:
F ' indicates the contact force between the female union under the thread interference amount 0.07mm of setting and the screw thread of wing nut, with
And retaining ring is to the axial resultant force of the contact force of wing nut compression face；d1Indicate the pitch diameter of thread of female union and wing nut,
Size is equal to screw thread average diameter；Indicate the lead angle of female union and wing nut, i.e., the helix on central diameter cylindrical surface
Tangent line and the plane included angle perpendicular to spiral axis；ρ indicates the screw thread equivalent friction angle of female union and wing nut, is friction
The inverse tangent angle of coefficient；
T2Calculation formula it is as follows:
μ indicates the retaining ring under the thread interference amount 0.07mm of setting to the coefficient of friction at wing nut compression face；D is indicated
Maximum gauge of the retaining ring to wing nut compression face；d2Indicate retaining ring to the minimum diameter of wing nut compression face.
It is obtained by calculation: T1=1157.2N*m, T2=1005.8N*m, T=2163N*m are to get to torque wrench moment
2163N*m。
Step 6: changing the step the thread interference amount set in one, step 1 is repeated to step 5, calculates separately to obtain spiral shell
Torque wrench moment value when line magnitude of interference is 0.06mm, 0.05mm, 0.04mm, 0.03mm draws thread interference amount and torque wrench moment
Graph of relation between value, as shown in Figure 3.Torque wrench moment according to the actual measurement of live torque spanner is 2003N*m, passes through Fig. 3
Obtaining corresponding thread interference amount is 0.065mm, then using thread interference amount be 0.065mm as the screw thread set in step 1
Magnitude of interference repeats step 1 to step 4, obtains and thread interference amount corresponding to practical torque wrench moment value 2003N*m
The stress distribution cloud atlas of the corresponding union connection structure of 0.065mm, thus when the torque wrench moment surveyed is 2003N*m
The stress distribution cloud atlas of high pressure pipe joint union connection structure, and peak stress is 495.8MPa, position at female union end the
At three thread roots, it coincide with actual conditions.
Embodiment 2
A kind of fracturing work high pressure pipe joint union connection structure and the strength calculation method of screw thread, comprising the following steps:
1) geometrical model of union connection screw thread part and associated part is established using three-dimensional software；
2) after being assembled according to the thread interference amount of setting, two dimension is converted at the most weak rigging position of structural strength
Axisymmetric model；
3) two-dimensional axial symmetric model is imported in finite element software and grid dividing is carried out to all components, obtain finite element net
Lattice model.Definition material attribute, the material properties refer to the elasticity modulus of threaded portion and associated part material, Poisson
Than, yield stress and ultimate strength；
4) corresponding load boundary is applied to finite element mesh model and restrained boundary condition, the load boundary includes
The threaded pre-tightening power that screwed part and its inner flow passage wall of associated part bear Fluid pressure and be threadedly coupled part, it is described
Threaded pre-tightening power controlled by the thread interference amount of setting, i.e., threaded pre-tightening power is by the thread interference amount that sets in step 1
Module is contacted by the model in finite element software to control；The restrained boundary condition includes the contact between internal and external threads
Contact relation, public union and female union between contact relation, retaining ring between relationship, wing nut and retaining ring and public union it
Between contact relation；
5) relation curve for obtaining thread contact power from different thread interference amounts is solved using finite element software, further according to reason
Torque wrench moment and thread interference magnitude relationship curve are solved by empirical equation；
6) 2) -4 are repeated) step, and screw thread mistake corresponding to practical torque wrench moment can be solved using finite element software solution
High pressure pipe joint union connection structure and screw strength under the amount of being full of.
In the fracturing work strength calculation method of high pressure pipe joint union connection structure and screw thread, the high pressure pipe joint connects
Threaded portion and its associated part are connect in grid dividing using Plane77 dividing elements grid, and especially to threaded portion
Mesh refinement.
In the fracturing work strength calculation method of high pressure pipe joint union connection structure and screw thread, limited simulation model is solved
The contact force of the contact forces of screw thread and wing nut compression face out, and binding isotherm empirical equation calculates, it is as follows, determine effect
In fracturing work high pressure pipe joint union connection structure and the friction torque of screw thread:
Use T1It indicates screw thread torque, is calculated by formula (1)；Use T2The torque for indicating wing nut compression face, passes through formula
(2) it calculates；Total friction torque is indicated with T, is calculated by formula (3):
T=T1+T2 (3)
In formula:
F ' is that limited simulation model solves the contact forces of screw thread and the axial of the contact force of wing nut compression face is closed
Power；
d1For the pitch diameter of thread, it is equal to screw thread average diameter；
φ is lead angle, the tangent line of helix and the plane included angle perpendicular to spiral axis on central diameter cylindrical surface；
ρ is screw thread equivalent friction angle, is the inverse tangent angle of coefficient of friction；
μ is coefficient of friction at wing nut compression face；
D is wing nut compression face maximum gauge；
d2For wing nut compression face minimum diameter.
Wherein, torque wrench moment is equal to total friction torque of union connection structure and screw thread.
In the fracturing work strength calculation method of high pressure pipe joint union connection structure and screw thread, the thread interference amount
Numberical range is 0~0.08mm.
In the fracturing work strength calculation method of high pressure pipe joint union connection structure and screw thread, the screw thread is indirectly
Touching relationship and the contact relation of wing nut compression face are disposed as CONTACT WITH FRICTION, and coefficient of friction is set as 0.15.
In the fracturing work strength calculation method of high pressure pipe joint union connection structure and screw thread, the retaining ring and it is public by
Contact relation may also be configured to binding contact between nonyl.
In the fracturing work strength calculation method of high pressure pipe joint union connection structure and screw thread, the actually twist buckle
Square is actually measured by live torque spanner.
In the fracturing work strength calculation method of high pressure pipe joint union connection structure and screw thread, solve high pressure pipe joint by
Nonyl connection structure and screw strength, and von Mises stress distribution cloud atlas is obtained, peak value and distribution reflection are threadedly coupled
Performance.
Claims (6)
1. a kind of fracturing work high pressure pipe joint union connection structure and the strength calculation method of screw thread, which is characterized in that including
Following steps:
Step 1: union is connected spiral shell after carrying out elastic conjunction to union connection screw thread component according to the thread interference amount of setting
Line component and its geometrical model of associated part are converted into two-dimensional axial symmetric model, import in finite element software and connect to union
Screwed part and its associated part carry out grid dividing, obtain finite element mesh model；
Step 2: definition material attribute, the material properties include the material of union connection screw thread component and its associated part
Elasticity modulus, Poisson's ratio, yield stress and ultimate strength；
Step 3: applying corresponding load boundary and restrained boundary condition to finite element mesh model obtained in step 1, obtain
To finite element model, wherein the load boundary include union connection screw thread component threaded connection part threaded pre-tightening power,
The Fluid pressure that public union and the inner flow passage wall of female union are born, the threaded pre-tightening power is by the screw thread mistake that sets in step 1
The amount of being full of contacts module by the model in finite element software to control；The restrained boundary condition includes female union and wing nut
Between CONTACT WITH FRICTION relationship, the CONTACT WITH FRICTION relationship between wing nut and retaining ring, the binding between retaining ring and public union connect
CONTACT WITH FRICTION relationship between touching relationship, public union and female union；
Step 4: finite element model obtained in step 3 is solved in finite element software, obtain setting with step 1
The stress distribution cloud atlas of the corresponding union connection structure of fixed thread interference amount；
Step 5: obtaining female union under the thread interference amount set in step 1 and wing nut by stress distribution cloud atlas
Contact force and retaining ring between screw thread are to the contact force of wing nut compression face, then the screw thread mistake by setting in step 1
The contact force meter of female union under the amount of being full of and the contact force between the screw thread of wing nut and retaining ring to wing nut compression face
Calculate corresponding torque wrench moment value；
Step 6: changing the step the thread interference amount set in one, step 1 is repeated to step 5, obtains different thread interference amounts
Under torque wrench moment value, draw the graph of relation between thread interference amount and torque wrench moment value, by thread interference amount with it is upper
Graph of relation between button torque value obtains thread interference amount corresponding to practical torque wrench moment value, then with practical torque wrench moment
The corresponding thread interference amount of value repeats step 1 to step 4 as the thread interference amount set in step 1, obtains and real
The stress distribution cloud atlas of the corresponding union connection structure of thread interference amount corresponding to the torque wrench moment value of border, to obtain and reality
High pressure pipe joint union connection structure and screw strength corresponding to the torque wrench moment value of border.
2. the strength calculation method according to claim 1 for splitting operation high pressure pipe joint union connection structure and screw thread,
It is characterized in that, grid dividing is carried out to union connection screw thread component and its associated part in the step 1 and uses Plane77
Unit carries out grid dividing, and grid cell size is 1mm, and the threaded connection Partial Mesh especially to union connection screw thread component
Encryption.
3. fracturing work according to claim 1 high pressure pipe joint union connection structure and the strength calculation method of screw thread,
It is characterized in that, passing through the female union under the thread interference amount set in step 1 and the screw thread of wing nut in the step 5
Between contact force and retaining ring the calculation formula of corresponding torque wrench moment value is calculated such as to the contact force of wing nut compression face
Under:
T=T1+T2
Wherein, T1Indicate the female union under the thread interference amount set in step 1 and the screw thread torque value of wing nut；T2It indicates
The torque value of retaining ring under the thread interference amount set in step 1 to wing nut compression face；
T1Calculation formula it is as follows:
F ' indicates the contact force between the female union under the thread interference amount set in step 1 and the screw thread of wing nut, and
Axial resultant force of the retaining ring to the contact force of wing nut compression face；d1Indicate the pitch diameter of thread of female union and wing nut；φ table
Show the lead angle of female union and wing nut；The screw thread equivalent friction angle of ρ expression female union and wing nut；
T2Calculation formula it is as follows:
μ indicates the retaining ring under the thread interference amount set in step 1 to the coefficient of friction at wing nut compression face；D indicates gear
Enclose the maximum gauge to wing nut compression face；d2Indicate retaining ring to the minimum diameter of wing nut compression face.
4. fracturing work according to claim 1 high pressure pipe joint union connection structure and the strength calculation method of screw thread,
It is characterized in that, the thread interference amount set in the step 1 is 0~0.08mm.
5. fracturing work according to claim 3 high pressure pipe joint union connection structure and the strength calculation method of screw thread,
It is characterized in that, the μ is 0.15.
6. fracturing work according to claim 1 high pressure pipe joint union connection structure and the strength calculation method of screw thread,
It is characterized in that, practical torque wrench moment value is actually measured by live torque spanner in the step 6.
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| CN201610283817.3A CN105975671B (en) | 2016-04-29 | 2016-04-29 | Fracturing work high pressure pipe joint union connection structure and the strength calculation method of screw thread |
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| CN109736724A (en) * | 2019-02-18 | 2019-05-10 | 天津钢管集团股份有限公司 | Aluminium alloy tubing and casing air-sealed special threaded joint structure |
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| WO2014096663A1 (en) * | 2012-12-18 | 2014-06-26 | Vallourec Oil And Gas France | Method for checking a screwing state of a tubular threaded seal |
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Effective date of registration: 20170905 Address after: 430223 Jianghan Oil bit Limited by Share Ltd office building, No. 5, Chinese workers' road, East Lake New Technology Development Zone, Wuhan, Hubei Applicant after: Sinopec Research Institute of petroleum machinery and Limited by Share Ltd Applicant after: SINOPEC OILFIELD EQUIPMENT CORPORATION Address before: Luo East Lake Development Zone 430079 Hubei city of Wuhan Province Yu Road No. 716 Hua Le business center 23 Applicant before: Research Institute of SINOPEC Petroleum Engineering Machinery Co., Ltd. |
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