CN109657255A - A kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated - Google Patents
A kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated Download PDFInfo
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- CN109657255A CN109657255A CN201710937402.8A CN201710937402A CN109657255A CN 109657255 A CN109657255 A CN 109657255A CN 201710937402 A CN201710937402 A CN 201710937402A CN 109657255 A CN109657255 A CN 109657255A
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Abstract
The present invention relates to a kind of calculation methods that non-API oil sleeve joint sealing performance is quantitatively evaluated.First, sampling formula combination sealing surfaces roughness is distributed using Monte Carlo random normal, simulation obtains sealing surface contour curve, according to the contour curve geometrical morphology characteristic statistics data under Different Sample and surface roughness, simulation curve geometry common feature is acquired, the microcosmic leak model of metal to metal seal is established.Then in conjunction with gas leakage characteristic, the gas leakage rate calculation formula containing sealing surface micro-geometrical structure feature is derived.Finally, it according to non-API oil sleeve joint main seal structure machined parameters, obtains primary sealing area and always seals preload pressure, the total slip of gas by main seal structure is calculated, prediction technique is quantitatively evaluated thus to obtain non-API oil sleeve joint sealing performance.The present invention considers the influence of multiple oil sleeve joint sealing machined parameters and gas leakage characteristic to slip.
Description
Technical field
The present invention relates to a kind of non-API connector oil jacket Manifold technologies of high-pressure gas well petroleum pipe, and in particular to one kind is quantitative
Assess the calculation method of non-API oil sleeve joint sealing performance.
Background technique
Along with a large amount of exploitations in China high pressure gas field, the non-API tubing and casing application with higher gas tightness is increasingly wide
It is general.However, non-API tubing and casing has its unique sealing structure compared to API tubing and casing, therefore, general API tubing and casing is commented
Price card standard is not suitable for non-API oil sleeve joint.Joint sealing performance evaluation method in the class standard is by " joint screw thread connects
Contacting surface " is used as evaluation object, leaks angle from " zero ", first calculates " thread seal surface contact pressure ", then pass through comparison
" thread seal surface contact pressure " and " gas pressure in tubing and casing " size to evaluate and test the sealing performance of oil sleeve joint indirectly.And
In fact, sealing is relative concept, absolute " zero " leakage phenomenon and the evaluation result accuracy for being not present, therefore thus obtaining
It is very low, it cannot really reflect prediction oil sleeve joint sealing performance.
Currently, being directed to the research means of non-API oil sleeve joint sealing performance, it is mainly based upon sealing surface contact pressure number
The qualitative analysis that value simulation calculates.The technology machined parameters at oil sleeve joint sealing structure are not accounted in calculation method
(e.g., sealing surface contact form, contact area, surface roughness, stop-leak compound and process for treating surface, etc.) to the shadow of sealing effect
It rings, therefore also can not just disclose the quantitative relationship between above-mentioned factor and sealing performance, so that non-API oil sleeve joint sealing knot
Critical processing parameters at structure become a small number of external producer patents.Therefore microcosmic Leak Mechanism is introduced into sealing performance assessment, in conjunction with
Macro-stress-strain rule, considers a variety of sealing influence factors, derives a kind of non-API oil sleeve joint sealing of qualitative assessment
The calculation method of performance is very necessary and important.
Summary of the invention
It is an object of the invention to make up the defect of the prior art and deficiency, provide a kind of for high-pressure gas well oil jacket tubing
The method being quantitatively evaluated with non-API oil sleeve joint sealing performance, by microcosmic Leak Mechanism by surface roughness, leaking medium
A variety of sealing influence factors such as characteristic, are introduced into metal to metal seal Performance Evaluation, in conjunction with plastoelasticity and hydrodynamics
Theory is released and calculates public affairs containing sealing surfaces micro-geometrical structure feature and the slip of the important machined parameters of main seal structure
Formula, establishes a set of method being quantitatively evaluated suitable for non-API casing joint sealing, has high sealing for China's independent research
The casing joint of performance provides Theoretical Design reference frame.
The present invention relates to concept " API tubing and casing " and " non-API tubing and casing ", come from " API BUL 5C3: about set
Pipe, drilling rod, the formula of drilling rod and line pipe and calculating bulletin " and " ISO TR 10,400 2007: petroleum pipeline characteristic formula and
Calculate bulletin "
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated of the invention, specifically includes following step
It is rapid:
Step 1: the microcosmic leak model of metal to metal seal containing default surface roughness is established
Sampling formula is distributed using Monte Carlo random normal to simulate in conjunction with sealing surfaces roughness machined parameters
To the sealing surface profile simulation curve of Normal Distribution and default surface roughness in 0.1~1.6 micron range.
" sample average " used in Monte Carlo random normal distribution sampling formula takes sealing surface surface roughness
Value, 1/6th of " sample standard deviation " contouring curve maximum height value
Under foundation Different Sample and surface roughness, the average peak angle of contour curve, average peak height and triangle peak number
The statistical data of mesh and sample size ratio, analysis obtain the geometry common feature of sealing surface simulation contour curve: obeying normal state
The profile simulation curve of distribution is thirdly the ratio of horn number and sample size is one third under any rough surface.
According to sealing surface profile simulation curve geometry common feature, simulation contour curve is reduced to by multiple identical isosceles
The coherent composition of three horns.The quantity value at isoceles triangle peak is the one third of sample size, and isoceles triangle summit angle value is
The average peak angle value of sealing configuration curve, isoceles triangle peak heights value are the average peak value of sealing configuration curve.
In conjunction with sealing surface contour curve geometrical morphology parameter, establishing, there is the high rigidity tube body of geometry common feature to be laminated into
The microcosmic leak model of soft soft metal coating.
The present invention relates to " Monte Carlo random normal distribution sampling formula ", " sample size ", " sample canonical
Difference " comes from " Monte Carlo method is theoretical and applies ".
The present invention relates to concept " surface roughness ", " contour curve maximum height " comes from " tribology study course ".
The present invention relates to " 0.1~1.6 micron of surface roughness value range " come from national standard GB/T1031-1995
" surface roughness parameter and its numerical value ".
The present invention relates to " simulation contour curve ", " average peak angle ", " average peak height ", " it is bent that sealing surface simulates profile
The geometry common feature of line ", " being reduced to be formed by multiple identical isoceles triangle peaks are coherent by simulation contour curve " is " single etc.
The calculation formula of lumbar triangle peak base edge lengths " comes from the periodical literature delivered for 2015 " based on fractal theory and random sampling
Machining surface roughness profile curve geometrical morphology general character characterization ".
Step 2: the released gas rate calculation formula based on microcosmic leak model is derived
Regard gas leakage as incompressible stably stratified flow, and consider the characteristics such as gas leakage pressure, viscosity, derives and contain
There is the gas leakage rate calculation formula of sealing surface micro-geometrical structure feature (the equal peak height of average peak angle peace).
The present invention relates to concept " considering gas leakage pressure, the characteristics such as viscosity ", " primary sealing area always seals to press in advance
Power ", " interface pressure that metal to metal seal interference generates ", " the slip calculation formula of single leakage path " comes from
The periodical literature " application of the microcosmic Leak Mechanism in the assessment of non-API casing joint sealing " delivered for 2014.
Step 3: it establishes non-API oil sleeve joint sealing performance and calculation method is quantitatively evaluated
It is " metal that sealing surface at non-API oil sleeve joint main seal structure (conical surface is to the conical surface), which always seals preload pressure,
The interface pressure that metal sealing interference is generated " and " contact pressure generated by gas in tubing and casing in primary sealing area "
And value.
According to non-API oil sleeve joint main seal structure machined parameters, non-API oil sleeve joint primary sealing area is calculated
Total sealing preload pressure.
Non- API oil sleeve joint primary sealing area will be calculated and always seal the leakage that preload pressure substitutes into single leakage path
Rate calculation formula, then total slip at non-API oil sleeve joint main seal structure (conical surface is to the conical surface) are as follows: sealing face leakage is logical
The product of road number and single path leakage rate.
Total slip at non-API oil sleeve joint main seal structure (conical surface is to the conical surface) obtained by calculation as a result,
Non- API oil sleeve joint sealing performance can be quantitatively evaluated according to the value.
The present invention relates to concept " non-API oil sleeve joint main seal structure (conical surface is to the conical surface) ", " primary sealing area is total
Seal preload pressure ", " interface pressure that metal to metal seal interference generates ", " by gas in tubing and casing in primary sealing area
Locate the contact pressure generated ", " main seal structure machined parameters, comprising: metal to metal seal face matching allowance, material elasticity
Modulus, tubing and casing internal diameter of tube body, oil casing collar outer diameter ", coming from the periodical literature delivered for 2016, " non-API casing joint is complete
Whole property assesses calculation method ".
The beneficial effects of the present invention are:
1. a kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated of the invention, has fully considered non-
API oil sleeve joint main seal structure machined parameters (connector internal-and external diameter, wall thickness, it is primary sealing area contact form, contact area, close
Cover surface roughness, sealing medium viscosity and pipe internal leakage gas pressure, etc.) to gas leakage influence, improve sealing
The confidence level and versatility of performance calculating assessment result.
2. a kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated of the invention, can be realized to not
Non- API oil sleeve joint sealing performance with machining accuracy carries out quick, high-precision calculating prediction, by utilizing Monte
Carlo sampling formula simulates to obtain the sealing surface contour curve of Normal Distribution and default surface roughness value, and analysis obtains
Simulation contour curve geometry common feature under Different Sample and surface roughness, and then establish with geometry common feature
The microcosmic leak model of sealing surface, solve according to laboratory surface profile test data bring precision and operating error, increase
The strong flexibility and efficiency of calculation method.
3. a kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated of the invention, can not only obtain
Pass through the total slip of gas at non-API oil sleeve joint main seal structure (conical surface is to the conical surface), it is often more important that pass through gas
This specific data of leakage rate be directly accurately quantitatively evaluated to the sealing performance of non-API oil sleeve joint, from
And more accurately instruct the design and application of petroleum pipe column in gas well recovery process.
Detailed description of the invention
With reference to the accompanying drawing, detailed description of the preferred embodiments.
Fig. 1 is a kind of flow chart for the calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated of the present invention；
Fig. 2 is the sealing surface contour curve simulation drawing under different default surface roughnesses of the invention；
Fig. 3 is the present invention simulation single isoceles triangle peak simplified element of contour curve；
Fig. 4 is the metal to metal seal face simplified model that the present invention has micro-geometrical structure common feature；
Fig. 5 is non-API oil sleeve joint main seal structure (conical surface is to the conical surface seal) schematic diagram of the present invention；
In attached drawing, each label is represented: 1-isoceles triangle summit angle, 2-isoceles triangle peak peak heights, 3-isoceles triangle peak bases
Side, the interval between 4-adjacent isoceles triangle peaks, 5-soft soft metal layer isoceles triangle peaks, 6-high rigidity metal layers etc.
Lumbar triangle peak, 7-primary sealing area diameters, 8-tubing and casing internal diameter of tube body, 9-oil casing collar outer diameters, 10-tubing and casing tube bodies are most
Small wall thickness, 11-primary sealing area contact lengths, 12-primary sealing area inclination angles.
Specific embodiment
A kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated of the invention, it is preferably specific real
Mode is applied referring to Fig. 1, comprising:
Step 1: the microcosmic leak model of metal to metal seal containing default surface roughness is established
Sampling formula combination sealing surfaces roughness machined parameters are distributed using Monte Carlo random normal, are simulated
To the sealing surface contour curve of Normal Distribution and default surface roughness value.
Monte Carlo random normal distribution sampling formula:
In formula, μ is sample average；σ is sample standard deviation；r1, r2The equally distributed random number series between [0,1].
Using the surface roughness value of sealing surface as sample average μ, sealing surface contour curve maximum height value six/
One is used as sample standard deviation σ, is distributed sampling formula using Monte Carlo random normal, obtains default surface roughness 0.1
Sealing surface profile simulation curve in~1.6 micron ranges, referring to fig. 2.
According to the average peak angle in sealing surface profile simulation curveAverage peak heightWith triangle peak number mesh and sample size
The statistical data of ratio, analysis obtain sealing surface profile simulation curve geometry common feature: the profile simulation of Normal Distribution
Its peak angle number of curve and sample size ratio value under any rough surface are one third.
According to sealing surface profile simulation curve geometry common feature, simulation contour curve is reduced to by multiple identical isosceles
The coherent composition of three horns, as shown in Figure 3.1 value of isoceles triangle summit angle is the average peak angle value of sealing configuration curveIsosceles
Three horn peak heights, 2 value is the average peak value of sealing configuration curve
The calculation formula of 3 length of single isoceles triangle peak base side:
In formula, a is the half of 3 length of single isoceles triangle peak base side；For average peak angle；For average peak height.
The sealing surface profile simulation curve geometry common feature obtained according to analysis, it is known that the quantity at isoceles triangle peak is sample
The one third of this capacity, thus push away 4 value of interval between adjacent isoceles triangle peak is that single isoceles triangle peak base side 3 is long
The half of degree.
According to non-API oil sleeve joint sealing surface treatment process, it is desirable that plate one layer of soft metal at main seal structure, applying
Soft soft metal layer isoceles triangle peak 5 after encryption cover preload pressure at main seal structure is crushed, high rigidity metal layer
Isoceles triangle peak 6 is pressed into soft metal coating, establishes the microcosmic leak model of metal to metal seal with geometry common feature, ginseng
See Fig. 4.
Step 2: the released gas rate calculation formula based on microcosmic leak model is derived
Regard gas leakage as incompressible stably stratified flow, derives (average containing sealing surface micro-geometrical structure feature
Peak angleWith average peak height) gas leakage rate calculation formula.
The slip calculation formula of single leakage path:
The wherein calculation formula of A:
In formula: QvFor the released gas rate of single leakage path；L is the leakage length of single leakage path；piTo leak gas
Body pressure；η is the dynamic viscosity of gas leakage；Total sealing preload pressure of p sealing surface；K be metallic sealing material pure shear not
Varying stress.
Step 3: according to non-API oil sleeve joint main seal structure machined parameters, non-API oil sleeve joint sealing is obtained
Calculation method is quantitatively evaluated in performance.
Sealing preload pressure at non-API oil sleeve joint main seal structure (conical surface to conical surface seal, referring to Fig. 5) is by two
Part forms: first is that being generated by the radial interference fit of outer diameter at box cupling sealing internal diameter and the oil jacket seal of tube；Second is that by pipe
Gas is acted on inside oil sleeve joint and is generated.It is theoretical according to the Combined thick wall cylinder in plastoelasticity, it derives and is produced by interference
Raw interface pressure pcWith the interface pressure Δ p generated by intraductal atmospheric pressurec。
The interface pressure calculation formula generated by interference:
In formula: pcAt non-API oil sleeve joint main seal structure, the contact face pressure of metal to metal seal interference generation
Power；ξ is metal to metal seal face matching allowance；E is tubing and casing elasticity modulus of materials；D (z) is that the master at ordinate z is close
Cover diameter 7；DiFor tubing and casing internal diameter of tube body 8；W is oil casing collar outer diameter 9.
The interface pressure calculation formula generated by intraductal atmospheric pressure:
In formula: Δ pcFor the contact pressure generated by gas in tubing and casing in primary sealing area；piFor gas pressure in tubing and casing
Power.
It is the conical surface to cone structure for non-API oil sleeve joint primary seal, the meter of primary sealing area diameter 9 at the place ordinate z
Calculate formula:
D (z)=Di+2tmin+2L(z)·sinβ (7)
In formula: tminFor tubing and casing tube body minimum wall thickness (MINI W.) 10；L (z) is the primary sealing area contact length 11 at ordinate z；β
For non-API oil sleeve joint primary sealing area inclination angle 12.
It can to sum up obtain, the sealing surface at non-API oil sleeve joint main seal structure (conical surface is to the conical surface) always seals to press in advance
Power calculation formula:
P=pc+Δpc (8)
It is calculated at non-API oil sleeve joint main seal structure (conical surface is to the conical surface) according to formula (5) and formula (6)
Sealing surface always seals preload pressure p.The value is substituted into the slip calculation formula (3) of single leakage path, then non-API tubing and casing
Total slip at connector main seal structure (conical surface is to the conical surface) are as follows: sealing face leakage channel number and single path leakage rate Qv
Product, total slip Q calculation formula:
Q=2int (π D (z)/3a) Qv (9)
In formula: Q is total slip at non-API oil sleeve joint main seal structure (conical surface is to the conical surface)；Int () is to take
It is whole.
Total slip at non-API oil sleeve joint main seal structure (conical surface is to the conical surface) obtained by calculation as a result,
Non- API oil sleeve joint sealing performance can be quantitatively evaluated according to the value.
It is the preferable specific embodiment of the present invention above, it can however not assert that a specific embodiment of the invention only limits
In this, for those of ordinary skill in the art to which the present invention belongs, without departing from the inventive concept of the premise, may be used also
To make several simple deduction or replace, it all shall be regarded as belonging to the present invention by the claims submitted and determine that patent is protected
Protect range.
Claims (4)
1. a kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated, it is characterised in that: the analysis method tool
Body includes the following steps:
Step 1: the microcosmic leak model in metal to metal seal face containing default surface roughness is established
Sampling formula combination sealing surfaces roughness machined parameters are distributed using Monte Carlo random normal, simulation is taken
From the sealing surface contour curve of normal distribution and default surface roughness value；Under foundation Different Sample and surface roughness,
The statistical data of the average peak angle of contour curve, average peak height and triangle peak number mesh and sample size ratio, analysis are sealed
Face mould intends the geometry common feature of contour curve；In conjunction with sealing surface contour curve geometrical morphology parameter, establishing has geometry general character
The microcosmic leak model of the high rigidity tube body layer cone indentation soft soft metal coating plane of feature；
Step 2: the released gas rate calculation formula based on microcosmic leak model is derived
Regard gas leakage as incompressible stably stratified flow, and consider the characteristics such as gas leakage pressure, viscosity, derives containing close
The gas leakage rate calculation formula of cover micro-geometrical structure feature；
Step 3: it establishes non-API oil sleeve joint sealing performance and calculation method is quantitatively evaluated
According to non-API oil sleeve joint main seal structure machined parameters, it is always close that non-API oil sleeve joint primary sealing area is calculated
Preload pressure is sealed, which is substituted into released gas rate calculation formula, non-API oil sleeve joint main seal structure can be calculated
Thus total slip at (conical surface is to the conical surface) can quantify non-API oil sleeve joint sealing performance according to total slip
Assessment.
2. a kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated according to claim 1, feature
It is, " sample average " used in Monte Carlo random normal distribution sampling formula described in step 1 takes sealing surface
Surface roughness value, value range are 0.1~1.6 micron；The six of " sample standard deviation " contouring curve maximum height value/
One；
The geometry common feature of the sealing surface simulation contour curve is: the profile simulation curve of Normal Distribution is thirdly angle
The ratio of peak number mesh and sample size is one third under any rough surface；
The microcosmic leak model of the sealing surface is: according to sealing surface profile simulation curve geometry common feature, will simulate profile
Curve is reduced to be formed by multiple identical isoceles triangle peaks are coherent, the quantity value at isoceles triangle peak be sample size three/
One, isoceles triangle summit angle value is the average peak angle value of sealing configuration curve, and isoceles triangle peak heights value is sealing configuration
The average peak value of curve, the calculation formula of single isoceles triangle peak base edge lengths are as follows:
In formula, a is the half of single isoceles triangle peak base edge lengths；For the average peak angle value of sealing configuration curve；For
The average peak value of sealing configuration curve.
3. a kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated according to claim 1, feature
It is, gas leakage rate calculation formula described in step 2 is calculation formula of the gas by single leakage path:
The wherein calculation formula of A:
In formula: QvFor the released gas rate of single leakage path；L is the leakage length of single leakage path；piFor gas leakage pressure
Power；η is the dynamic viscosity of gas leakage；Total sealing preload pressure of p sealing surface；K is the pure shear not allergic effect of metallic sealing material
Power.
4. a kind of calculation method that non-API oil sleeve joint sealing performance is quantitatively evaluated according to claim 1, feature
It is, non-API oil sleeve joint main seal structure described in step 3 is the conical surface to conical surface sealing structure；
The non-API oil sleeve joint main seal structure machined parameters include: the conical surface to conical surface seal magnitude of interference, primary sealing area
Diameter, tubing and casing internal diameter of tube body, oil casing collar outer diameter, the minimum wall thickness (MINI W.) of tubing and casing tube body, primary sealing area inclination angle；
The non-API oil sleeve joint primary sealing area always seals preload pressure and consists of two parts: first is that by box cupling sealing
The radial interference fit of outer diameter generates at internal diameter and the oil jacket seal of tube；It is produced second is that being acted on inside oil sleeve joint by gas in pipe
It is raw；
Primary sealing area diameter D (z) at the ordinate z is the conical surface to conical surface knot for non-API oil sleeve joint primary seal
The structure value calculation formula are as follows:
D (z)=Di+2tmin+2L(z)·sinβ
In formula: tminFor the minimum wall thickness (MINI W.) of tubing and casing tube body；L (z) is the sealing surface contact length at ordinate z；β is non-API oil
Casing joint primary sealing area inclination angle；
Total slip at the non-API oil sleeve joint main seal structure (conical surface is to the conical surface) are as follows: sealing face leakage channel
The product of number and single path leakage rate, calculation formula are as follows:
Q=2int (π D (z)/3a) Qv
In formula: Q is total slip at non-API oil sleeve joint main seal structure (conical surface is to the conical surface)；Int () is to be rounded.
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| CN111737905A (en) * | 2020-07-06 | 2020-10-02 | 重庆科技学院 | Method for predicting leakage rate of special threads of oil well pipe |
| CN112287576A (en) * | 2020-10-12 | 2021-01-29 | 浙江大学 | Method for predicting seal leakage between macro-micro combined sheet type multi-channel valve plates |
| CN113505451A (en) * | 2021-07-07 | 2021-10-15 | Oppo广东移动通信有限公司 | Method for determining narrowest width of waterproof sealing foam of upper cover and lower cover and related product |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111737905A (en) * | 2020-07-06 | 2020-10-02 | 重庆科技学院 | Method for predicting leakage rate of special threads of oil well pipe |
| CN112287576A (en) * | 2020-10-12 | 2021-01-29 | 浙江大学 | Method for predicting seal leakage between macro-micro combined sheet type multi-channel valve plates |
| CN112287576B (en) * | 2020-10-12 | 2022-06-21 | 浙江大学 | Method for predicting seal leakage between macro-micro combined sheet type multi-channel valve plates |
| CN113505451A (en) * | 2021-07-07 | 2021-10-15 | Oppo广东移动通信有限公司 | Method for determining narrowest width of waterproof sealing foam of upper cover and lower cover and related product |
| CN113505451B (en) * | 2021-07-07 | 2023-07-14 | Oppo广东移动通信有限公司 | Method for determining narrowest width of waterproof sealing foam of upper cover and lower cover and related products |
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Application publication date: 20190419 |