CN108982076A - A kind of gas well at HTHP oil pipe hermetic seal screw thread assay method - Google Patents
A kind of gas well at HTHP oil pipe hermetic seal screw thread assay method Download PDFInfo
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Abstract
The invention discloses a kind of gas well at HTHP oil pipe hermetic seal screw thread assay methods, according to gas well at HTHP underground work environmental characteristic and helicitic texture feature, is analyzed by hermetic seal screw thread torque wrench moment and determine that limit tolerance sample carries out operating loading respectively under different torque wrench moments and stress corrosion environment hermetic seal employment and suitability test (E & ST) is evaluated；Then it is analyzed according to hermetic seal screw thread torque wrench moment, selection limit tolerance and torque carry out operating loading and compose lower gas tightness finite element analysis, carry out underground working loading spectrum hermeticity analysis after detaining on hermetic seal screw thread；Then it carries out downhole oil tubing string and produces the antifatigue analysis of gas production process screw thread dynamic loading, it is last to determine employment and suitability test (E & ST) assessment process, the applicable reliability of comprehensive evaluation analysis screw thread according to the vulnerable link of analysis.This method can be widely applied to gas well at HTHP, the high Fractured Gas Wells of unconventional multistage, especially suitable for the selection of the deep & ultra-deep wells well completion oil tube column screw thread such as Tarim Basin, Southwest Oil and fitness-for-service assessment.
Description
Technical field
The invention belongs to natural petroleum gas field technical fields, and in particular to a kind of gas well at HTHP oil pipe hermetic seal spiral shell
Line assay method.
Background technique
It is Tarim Basin, southwest that Chinese high temperature and pressure, which three surpasses the representative oil gas field of gas well,.For such complicated work
Condition oil/gas well, oil string thread detection evaluation exemplary process are the level Four test evaluations (CAL IV) of ISO13679；But pass through inspection
A large amount of leakages still have occurred in the gas well at HTHP application process such as Tarim Basin, southwest in the oil pipe hermetic seal screw thread of assessment valence
And fracture failure.The difference of comparative analysis underground actual condition and evaluation method:
1) it is detained on screw thread: ISO examination criteria regulation, for the worst hermetic seal sample 1# sample of screw thread limit tolerance, by minimum
It is detained on torque, there is minimal-contact length and pressure (i.e. worst leakproofness) according to primary seal after upper button, detect under 1# sample load
Leakproofness；Oil Field torque wrench moment variation screw thread plastic deformation stress corrosion gas under underground working surrounding medium is not accounted for
Seal failure and vibrating fatigue hermetic seal and fracture failure；
2) load hermetic seal: iso standard is stretched using the full envelope of A system and half envelope loading spectrum of B system or compression is (curved
It is bent) the hermetic seal ability of+pure external pressure (liquid) or pure internal pressure (gas) detection screw thread, according to comparing whether thread seal ability reaches
Equal tube body performances number be referred to as leakage efficiency；Do not account under real well that axial load and interior external pressure coexist under work condition environment
Influence to hermetic seal, due to the coupling inner thread tooth height 0.2mm higher than external screw thread or so of special thread, it is logical that screw thread forms fluid
Road directly acts on major seal, and primary seal contact pressure is caused to decline, and easily leads to underground screw thread internal pressure hermetic seal failure；
3) hermetic seal under hot environment: iso standard detects the gas of screw thread using C system stretching+internal pressure temperature cycling test
Sealability, declining according to material under high temperature yield strength performance and stretching lower seal contact pressure reduces under acceleration detection high temperature
Screw thread hermetic seal ability.Underground actual condition different work phase temperature and load change are not accounted for；Pressure break cryogenic tensile, it is raw
Gas flow stress model under high temperature compressed and post-buckling is produced, thread seal failure or fatigue fracture are caused.In view of above-mentioned ratio
To known to analysis: existing representative standard detection method is not suitable for gas well at HTHP operating condition, requires supplementation with and improve assay
Method:
1) need to evaluate in sealing contact under different torque wrench moments and shoulder plastic deformation issuable for sample under limit tolerance
Stress corrosion；
2) the airtight testing sealing of screw thread load should evaluate screw thread in axial load+interior external pressure according to underground load working condition spectrum analysis
+ environment temperature seal performance coexists；
3) flowing of production phase gas induces influence of the tubing string vibration to seal contact pressure and screw thread fatigue fracture.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of high temperature and pressure
Gas well oil pipe hermetic seal screw thread assay method.
The invention adopts the following technical scheme:
A kind of gas well at HTHP oil pipe hermetic seal screw thread assay method, according to gas well at HTHP underground work ring
Border feature and helicitic texture feature acquire screw thread and seal buckle ring number and delta torque on above buckle ring number, torque and shoulder, foundation
Screw thread stress stress-strain distribution carries out on hermetic seal screw thread under the conditions of acquiring data FEM Simulation difference torque wrench moment
Detain torsional analysis；Using simple harmonic oscillation fatigue tester, internal pressure air pressure is added to survey oscillation intensity according to underground, loads amplitude, note
Vibration cycles number and plastic strain amplitude are recorded, the leakage of observation thread failure phenomenon or fatigue fracture obtain antifatigue analysis data；It is logical
It crosses the analysis of hermetic seal screw thread torque wrench moment and determines that limit tolerance sample carries out operating loading respectively and answered under different torque wrench moments
The evaluation of power corrosive environment hermetic seal employment and suitability test (E & ST)；
Analysis thread it is defined be not same as above acquisition torque under profile part and enclose the different tolerances of number sunykatuib analysis under screw thread answer
Then power-Strain Distribution situation is analyzed according to hermetic seal screw thread torque wrench moment, selection limit tolerance and torque carry out operating loading
Lower gas tightness finite element analysis is composed, underground working loading spectrum hermeticity analysis after detaining on hermetic seal screw thread is carried out；
The vibration acceleration that three parameter testers of vibration detect three direction X, Y, Z is installed in tubing string, is accelerated according to vibration
Degree calculate analysis load amplitude, then carry out downhole oil tubing string produce the antifatigue analysis of gas production process screw thread dynamic loading, finally according to
Employment and suitability test (E & ST) assessment process is determined according to vulnerable link is analyzed, and in the worst tolerance fit of screw thread, be not same as above twist buckle
The reliability being applicable under moment condition and operating loading by analytical calculation and corresponding test evaluation comprehensive evaluation analysis screw thread.
Specifically, being detected in the analysis of hermetic seal screw thread torque wrench moment using ultrasonic echo bounce technique and limited element analysis technique
Length and pressure in sealing contact compare be not same as above the Line Integral of primary seal contact length and pressure initiation judgement under profile part respectively
Torque wrench moment is distributed hermetic seal influence and screw thread combined stress MISES and equivalent plastic strain, according to Numerical results
It determines limit tolerance sample and different torque wrench moments, carries out operating loading and stress corrosion environment hermetic seal employment and suitability test (E & ST) respectively
Evaluation.
Further, torque includes at least minimal torque value, best torque value, intermediate torque value and maximum torque.
Specifically, underground working loading spectrum hermeticity analysis after being detained on hermetic seal screw thread specifically: carry out underground working load
Lotus spectrum hermeticity analysis applies axial load, internal pressure and external pressure and temperature simultaneously, loads by material mechanical performance under actual temperature
It analyzes primary seal contact pressure and length and area changes, determine whether its leakproofness is suitable for the operating condition；Work out employment and suitability test (E & ST)
Loading spectrum sequence is evaluated, underground applicability is verified.
Further, it according to underground various processes condition, is calculated using tubular buckling under the conditions of analyzing different depth
Operating loading distribution, it includes testing pressure of well head, packer set, acid fracturing, life that down-hole oil tube column load, which composes tubular buckling analysis,
It produces gas production and casing pressure changes lower tubular column different depth position screw thread stress.
Specifically, the production antifatigue analysis of gas production process screw thread dynamic loading specifically: pass through antifatigue point of screw thread dynamic loading
Screw thread is antifatigue and the hermetic seal service life under analysis selection maximum vibration acceleration analysis screw thread simple harmonic oscillation bending alternating load, presses
Do not occur for 10000000 times to be broken and leak to be applicable in interpretational criteria as persistence.
Specifically, determining that employment and suitability test (E & ST) assessment process is specific as follows:
S401, limit tolerance sample are chosen；
S402, torque wrench moment are determining and anti-galling is tested；
S403, actual measurement material mechanical performance；
S404, the test of underground working loading spectrum and stress corrosion (cracking) test in kind；
S405, simple harmonic oscillation hermetic seal fatigue actual loading test；
S406, finite element and evaluation of test result comprehensive analysis screw thread are applicable in reliability.
Further, in step S403, actual measurement material mechanical performance includes stretching and fatigue behaviour.
Further, step S406 is specific as follows:
A basis of the worst leakproofness parameter coordination as fail-safe analysis) is chosen；The limit is fabricated according to thread parameter
Deviation sample；
B) both ends are distinguished detains on minimum and maximum torque, detect under screw thread anti-galling and minimal condition load leakproofness and
Stress and plastic strain under maximal condition, corrosive environment leakproofness；
C material mechanical property at a room temperature and a high temperature) is surveyed, analysis thread is under the conditions of not ibid button and loading spectrum, spiral shell
Line stress and strain variation, it is ensured that fail-safe analysis validity；
When D) extending test to easy leakage failure link according to underground working loading spectrum and theory analysis establishment test procedure
Between validity extend to 60min or more, it is ensured that the safe handling of underground static state operating loading；
E) downhole corrosion environment is simulated in stress corrosion (cracking) test in kind, if end of thread leaks in peak torque；Modify spiral shell
Line design parameter deviation, increasing sealing minimum interference amount reduces button peak torque reduction stress distribution and deformation；It is detained in control
Torque range minimum is to median, it is ensured that corrosive environment seal performance；Finally by theoretical point of the worst cooperation of product limit tolerance
Analysis and actual loading test verifying evaluation.
Compared with prior art, the present invention at least has the advantages that
The present invention is directed to the particularity (examination criteria and underground compare otherness) and helicitic texture particularity of underground working,
Carry out the analysis of limit tolerance torque wrench moment, carries out operating loading spectrum hermetic seal analysis under different torque wrench moments according to analysis and determine examination
It tests load step and protects and carry the time；It is monitored according to downhole oil tubing string vibration acceleration, determines that vibration hermetic seal fatigue failure test adds
Simple harmonic quantity wave-amplitude is carried, carries out the protracted fatigue limit, and carry out leakage failure forecast analysis, determines underground different depth position vibration shape
The screw thread service life under mode.In conjunction with above-mentioned fundamental analysis, vulnerable link is determined, analyze homogeneous tube male screw reliability, this method needle
To gas well at HTHP well completion oil tube column hermetic seal screw thread operating condition applicability analysis and evaluation, it is complete to improve down-hole oil tube column sealing
Property, it is suitable for 150 DEG C or more high temperature, 60MPa or more high pressure, the corrosive mediums environment gas well such as sulfide hydrogen, well completion oil tube column gas
It seals the evaluation of special thread Seal analysis, select, the proposition of improvement and control measure.
Further, it compares and is not same as above under profile part in the judgement of the Line Integral of primary seal contact length and pressure initiation respectively
Twist buckle square is distributed hermetic seal influence and screw thread combined stress MISES and equivalent plastic strain, true according to Numerical results
Determine limit tolerance sample and different torque wrench moments, carries out operating loading respectively and stress corrosion environment hermetic seal employment and suitability test (E & ST) is commented
Valence, according to principle difference torque wrench moment condition, screw thread shoulder magnitude of interference is different, that is, generates plastic deformation size and threaded interior walls
The region area that plastic strain occurs is different, causes stress corrosion degree different, therefore, is distinguished using different torque wrench moments
Carrying out simulation work condition environment test (including corrosive environment) can determine that hermetic seal screw thread underground is applicable in best torque wrench moment range.
It avoids the occurrence of inboard wall stress corrosion local reduction's sealing leak or cracking causes to fail.
Further, the hermeticity analysis of underground working loading spectrum applies axial load, internal pressure and external pressure and temperature simultaneously, presses
Material mechanical performance (elasticity modulus, material tensile property) load analysis primary seal contact pressure and length and area under actual temperature
Variation, determines whether its leakproofness is suitable for the operating condition；Employment and suitability test (E & ST) evaluation loading spectrum sequence is worked out, verifying underground is applicable in
Property, external pressure in underground working is simulated completely and co-exists in axial push-pull load and high-temperature temperature environmental change, and supplement improves ISO
The pure internal pressure of 13679 standard tests or external pressure unidirectionally load and only room temperature environment detects, the mechanics of materials at a temperature of cannot reflecting
It can change and the lower reduction destruction to screw thread hermetic seal coexists in interior external pressure, therefore, still may by the screw thread of standard detection
Underground leakage failure occurs.
Further, the antifatigue analysis selection maximum vibration acceleration analysis screw thread simple harmonic oscillation bending of screw thread dynamic loading is handed over
Screw thread is antifatigue under varying load and hermetic seal service life, foundation analyze vulnerable link and determine employment and suitability test (E & ST) assessment process, comprehensive
Evaluation analysis screw thread is applicable in reliability, produces in gas production process due to reservoir pressure, yield and temperature fluctuation, causes down-hole oil tube
Column vibration induces, and screw thread fatigue fracture and sealing leak are evaluated by screw thread fatigue crack-resistant and Seal analysis and verification experimental verification
Ensure that downhole safety uses.
Further, the deficiency for supplementing perfect existing international examination criteria ISO 13679, do not account for change in torque and
It is logical to work out fitness-for-service assessment program according to above-mentioned work condition environment feature for fatigue failure caused by load environment variation and production vibration
The verifying of overtesting Simulation evaluation can cause underground failure and true to avoid due to underground specific operation load and examination criteria difference
Ensure safety reliable use.
In conclusion the composite can be widely applied to gas well at HTHP, the high Fractured Gas Wells of unconventional multistage, it is particularly suitable
In the well completion oil tube column screw thread selection of the deep & ultra-deep wells such as Tarim Basin, Southwest Oil and fitness-for-service assessment.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is to detain Line Integral analysis figure in sealing contact on hermetic seal screw thread of the present invention；
Fig. 2 is screw thread equivalent plastic strain schematic diagram under difference of embodiment of the present invention torque wrench moment, wherein (a) is minimum
Button sealing equivalent plastic strain on torque, (b) button sealing equivalent plastic strain in peak torque；
Fig. 3 is operating loading of embodiment of the present invention analysis load schematic diagram；
Fig. 4 is that tubing round thread leakproofness checks schematic diagram at 2800m of the embodiment of the present invention；
Fig. 5 is amplitude schematic diagram under difference of embodiment of the present invention vibration acceleration；
Fig. 6 is that stress corrosion (cracking) test effect picture in kind is detained in peak torque of the embodiment of the present invention, wherein (a) is external screw thread
Nose stress corrosion (b) is the stress corrosion of box cupling shoulder；
Fig. 7 is inboard wall stress of embodiment of the present invention erosion profile schematic diagram；
Fig. 8 is seal contact pressure variation schematic diagram after inner wall corrosion of the embodiment of the present invention；
Fig. 9 be Sample A of the embodiment of the present invention the end B illustrate screw thread schematic diagram in kind.
Specific embodiment
Only focus on for existing international standard ISO13679 (the oil casing threaded detection assessment process of industrial gas oil -)
Air-sealed special threaded product quality under static load is detected, it, cannot be complete by waiting percentage of tube body performances to determine leakage efficiency
It is complete to adapt to gas well at HTHP working condition requirement.The present invention provides a kind of gas well at HTHP oil pipe hermetic seal screw thread assays
Method, according to gas well at HTHP underground work environmental characteristic and helicitic texture feature, supplement improves theory analysis and applicability
Evaluation, it is ensured that well completion oil tube column air-sealed special threaded is applicable in reliability.
Gas well at HTHP work condition environment feature is as follows:
A) contain corrosive medium；
B) operating loading changes diversity with compressive load inside and outside production process；
C) gas production process internal pressure and yield recurrent fluctuations tubing string are in oscillation exchange state.
Helicitic texture feature is as follows:
Using negative angle torque shoulder, increasing leakproofness with torque wrench moment is reduced, and shoulder and external screw thread nose stress improve
Plastic strain occurs, is also easy to produce stress corrosion under surrounding medium；The high coupling inner thread of tooth is greater than tube body external screw thread 0.2mm, external pressure
Liquid directly acts on primary seal, and improving leakproofness with external pressure reduces, and hermetic seal failure easily occurs.
A kind of gas well at HTHP oil pipe hermetic seal screw thread assay method of the present invention, comprising the following steps:
S1, the analysis of hermetic seal screw thread torque wrench moment；
Downhole oil tubing string is intended under the conditions of carrying out different torque wrench moments with the cooperation of the limit tolerance of air-tight seal screw joint
Analysis of finite element by numerical simulation；
Hermetic seal screw thread torque wrench moment includes: to detain on screw thread and upper button in sealing contact, shoulder contact；By acquisition screw thread and
Buckle ring number and delta torque, foundation acquisition data FEM Simulation are not detained ibid on buckle ring number, torque and shoulder in sealing
Under torque conditions, screw thread stress stress-strain distribution.
Using simple harmonic oscillation fatigue tester, internal pressure air pressure is added to survey oscillation intensity according to underground, loads amplitude, record vibration
Dynamic cycle-index (N) and plastic strain amplitude (Strain), the leakage of observation thread failure phenomenon or fatigue fracture.Analysis thread is providing
Be not same as above under profile part (screw thread under minimum, best, intermediate, peak torque acquisition torque and circle number sunykatuib analysis difference tolerance
Stress-strain distribution situation: such as plastic strain, maximum principal stress, seal contact pressure and contact length)
Torque include at least minimal torque value, best torque value (best torque value be screw thread manufacturing enterprise provide between
Minimum and maximum median；Median refers to best to be worth between maximum), four intermediate torque value, maximum torque values, comparison is not
Under the conditions of ibid detaining:
A) Line Integral of primary seal contact length and pressure initiation determines that torque wrench moment influences hermetic seal；
B) screw thread combined stress MISES and equivalent plastic strain distribution.
According to Numerical results, limit tolerance sample and different torque wrench moments are determined, carry out operating loading respectively and answer
The evaluation of power corrosive environment hermetic seal employment and suitability test (E & ST).
Underground working loading spectrum hermeticity analysis after being detained on S2, hermetic seal screw thread；
It is analyzed according to step S1 hermetic seal screw thread torque wrench moment, selection limit tolerance and torque carry out operating loading and compose lower gas
Leakproofness finite element analysis, load step should apply axial load, internal pressure and external pressure and temperature simultaneously, by material under actual temperature
Mechanical property (elasticity modulus, ess-strain) load analysis primary seal contact pressure and length and area change, and determine its leakproofness
Whether the operating condition is suitable for；Employment and suitability test (E & ST) evaluation loading spectrum sequence is worked out, underground applicability is verified.
Using ultrasonic echo bounce technique and finite element method detection seal contact pressure and length.
Tubing string stress is to be calculated under the conditions of analyzing different depth according to underground various processes condition using tubular buckling
Operating loading distribution, it includes testing pressure of well head, packer set, acid fracturing, life that down-hole oil tube column load, which composes tubular buckling analysis,
Producing gas production and casing pressure variation lower tubular column different depth position screw thread stress (should analyze axial force, internal pressure, external pressure and environment temperature
Degree)；
S3, the production antifatigue analysis of gas production process screw thread dynamic loading；
Different gas production, which are tested, according to three Parameters Instruments in downhole oil tubing string gas production process changes lower tubular column vibration acceleration, choosing
Selecting maximum vibration acceleration analysis screw thread simple harmonic oscillation bending, alternating load screw thread is antifatigue and the hermetic seal service life, by 10,000,000 times
Do not occur to be broken and leak to be applicable in interpretational criteria as persistence.
Pass through three parameter tester of the vibration (vibration acceleration of three direction X, Y, Z of detection, according to vibration installed in tubing string
Dynamic acceleration calculation analysis load amplitude).
S4, employment and suitability test (E & ST) evaluation and reliability assessment.
In the case of the worst tolerance fit of screw thread, pass through analytical calculation and phase under different torque wrench moment conditions and operating loading
Answer test evaluation, if the failure phenomenons such as leakage or fracture occur, as applicable reliability criterion, such as worst tolerance sealing is matched
It closes, under minimum and maximum torque；Under the conditions of vibration acceleration 6g under operating condition dynamic loading, at vibration 10,000,000 times or more；Have
Limit member, which calculates, to be analyzed under different tolerance fits, and sealing performance meets probability and reaches 99.9% or more under various conditions.
S401, limit tolerance sample are chosen；
Influence hermetic seal screw thread major parameter is tapered, the pitch diameter of thread, tooth are high and sealed increscence amount, using with worst
Sealing and the most easy thread gluing sample 1# of screw thread are shown in Table 1
1 limit tolerance sample of table is chosen
S402, torque wrench moment are determining and anti-galling is tested；
According to aforementioned theory analysis: carrying out buckleing on minimum and maximum torque respectively to 1# sample and anti-galling is examined in shackle
Stress corrosion Work condition analogue is tested under energy and the airtight testing sealing of subsequent operating condition and corrosive environment.Upper button requires to be shown in Table 2 and Fig. 9, tries
It tests end of thread in result maximum and thread gluing phenomenon does not occur.
Test requirements document is buckled on table 2
S403, actual measurement material mechanical performance (including stretching, fatigue)；
Actual measurement material mechanical performance include under room temperature and high temperature (180 DEG C) elasticity modulus of materials, yield strength, tension it is strong
Degree, elongation percentage and fatigue of materials intensity of circulation and cyclic strain hardening exponent, are shown in Table 3.
Table 3 is that elasticity modulus of materials, yield strength, tensile strength, elongation percentage and fatigue of materials intensity of circulation and circulation are answered
Become hardenability value
S404, the test of underground working loading spectrum and stress corrosion (cracking) test in kind；
Underground working loading spectrum test load(ing) point is shown in Table 4, and hermetic seal leakage does not occur for test process；
Stress corrosion (cracking) test in kind: according to underground load working condition (production produces 100,000 side's casing pressure of gas, 0 oil pressure 55MPa) and corrosion
Surrounding medium concentration and air pressure 67MPa and hydrogen sulfide content 27g/m3, carbon dioxide content 103g/m3, load axial full payload
50t, detects gas tightness by 84 DEG C of temperature.720 hours sample B ends of load are protected in test to leak.Inner wall surface is observed after shackle
There is significant local corrosion to see Fig. 7, the seal contact pressure reduction that is changed significantly is compared with intact condition, is to cause leakage main cause, is seen
Fig. 8.
S405, simple harmonic oscillation hermetic seal fatigue actual loading test；
Under the conditions of vibration acceleration 6g adds internal pressure 73MPa, through 10,000,000 oscillation exchanges tired mistake does not occur for test sample
Effect.S406, finite element and evaluation of test result comprehensive analysis screw thread are applicable in reliability.
A) choosing influences thread seal limit tolerance, that is, worst leakproofness parameter coordination, theory analysis and test evaluation
It is to determine reliability basis；Limit deviation sample is fabricated according to thread parameter；
B) both ends are distinguished detains on minimum and maximum torque, detect under screw thread anti-galling and minimal condition load leakproofness and
Stress and plastic strain under maximal condition, corrosive environment leakproofness；Screw thread is detained in test result peak torque without thread gluing phenomenon；
C) actual measurement material at a room temperature and a high temperature do not detaining and loading spectrum item ibid by mechanical property, theoretical Accurate Analysis screw thread
Under part, screw thread stress and strain variation.Ensure fail-safe analysis validity；
When D) extending test to easy leakage failure link according to underground working loading spectrum and theory analysis establishment test procedure
Between validity extend to 60min or more, it is ensured that sufficiently examine；Limit sample especially easily leaks link through operating loading spectral test
Evaluation does not leak when long, it is ensured that the safe handling of underground static state operating loading；
E) downhole corrosion environment is simulated in stress corrosion (cracking) test in kind, and end of thread leaks in peak torque, shows maximum torsion
Threaded interior walls stress corrosion is significant under square, causes to leak；It is unsatisfactory for using being applicable in reliability reduces；
1) Design of Screw Thread parameter error is modified, increases button peak torque in sealing minimum interference amount reduction and reduces stress distribution
And deformation；
2) torque wrench moment range minimum is controlled to median, it is ensured that corrosive environment seal performance；
F it) vibrates theory analysis and actual loading test under alternating load and shows that vibration acceleration is less than under the conditions of 6g, meet well
It is lower to see actual measurement underground vibrating acceleration detection table 5 using sealing reliability.
Table 5 is downhole oil tubing string vibration acceleration test result
Note: g refers to acceleration of gravity 9.81m/s2。
G) above-mentioned hp-ht well screw thread Analysis about Selection evaluation method: pass through the worst cooperation theory analysis of product limit tolerance
It verifies and evaluates with actual loading test, demonstrate the buckle type thread and be not suitable for gas well at HTHP under corrosive environment, need using control
Measure processed or modification helicitic texture parameter.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real
The component for applying example can be arranged and be designed by a variety of different configurations.Therefore, below to the present invention provided in the accompanying drawings
The detailed description of embodiment be not intended to limit the range of claimed invention, but be merely representative of of the invention selected
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
For gas well at HTHP, such as well depth (being greater than 5000m), temperature (150 DEG C of temperature), gas reservoir bottom pressure is greater than
60MPa, hydrogen sulfide in natural gas content 27g/m3Gas, carbon dioxide content 103g/m3 gas.Tubing string uses specification110 oil pipe of grade of steel, button-type are hermetic seal screw thread, carry out applicability to the hermetic seal screw thread of the well proposed adoption
Analysis and test evaluation.
Torque wrench moment analysis:
To the different torque wrench moment items of specification oil pipe hermetic seal screw thread limit tolerance (i.e. the high interference of screw thread, the low interference of sealing)
Fig. 1 is shown in primary seal contact area (contact pressure is multiplied by contact length) finite element analysis under part, and equivalent plastic strain is shown in Fig. 2, figure
In, PEEQ: equivalent plastic strain；MAX: maximum value；BOX: box cupling；ELEM: unit number；Min: minimum value；Node: node number,
Known to analysis:
Minimum torque wrench moment has minimum area in sealing contact；Area decline in sealing contact when maximum torque wrench moment.Shoulder
Interference increases, and opposing angular shoulder wedge angle position plastic deformation is serious, and reaction force concentrates at shoulder inner wall, and contact is caused to press
Power locally increases, and reduces at shoulder；Surrender plastic deformation, the outer nose of sealing surface occurs close to the complete thread of the 1st button of sealing
Stress increases, easily generation stress corrosion.
By torque wrench moment is analyzed: using standard ISO13679 tubing and casing hermetic seal thread measurement evaluation method, only
Minimum torque wrench moment load hermetic seal test evaluation is carried out to limit tolerance 1# sample (i.e. the high interference of screw thread, the low interference of sealing), no
It can reflect that button plastic deformation stress corrosion influences sealing in peak torque.
Therefore, it should carry out buckleing the evaluation of hermetic seal load and maximum in minimal torque for hermetic seal screw thread limit tolerance 1# sample
Stress corrosion hermetic seal test evaluation in kind is detained on torque.
Underground working loading spectrum hermeticity analysis
Oil pipe different work stage force analysis is shown in Table 6, and it is airtight that citing carries out operating loading screw thread to the position tubing string 2800m
Envelope property applicability analysis.Using being detained in hermetic seal screw thread limit tolerance (i.e. the high interference of screw thread, the low interference of sealing) minimal torque, divide
Analyse underground working applicability.
Underground loading spectrum at table 6:2800m
Loading method is shown in Fig. 3, while loading axial force, internal pressure and external pressure and temperature, and external pressure penetrates screw thread and directly acts on
Primary sealing area.
In sealing contact be distributed sees Fig. 4 under the conditions of different loads, and contact area analysis is shown in Table 7, compares 2800m and 5400m
Tensile load is set, increases contact area with tensile load and reduces, stretches plus influence of the external pressure to sealing is more significant.Same position
Compare and increase contact area increase with internal pressure, it is not significant to compress lower influence of the external pressure to sealing.
Different work operating condition and down well placement thread seal are analyzed, the screw thread danger weak location is in stretching plus outer pressure
When hermetic seal, that is, casing pressure 55MPa, hermetic seal leakage easily occurs for screw thread.
Table 7: underground working load applicability analysis unit (N/mm)
| Contact pressure area | 2800m | Variable quantity (%) | 5400m | Variable quantity (%) |
| Upper button | 869 | 0 | 869 | 0 |
| Pressure testing | 1039 | 20 | 1039 | 20 |
| Unloading | 842 | -3 | 842 | -3 |
| It is setting | 831 | -4 | 1000 | 15 |
| Pressure break | 838 | -4 | 983 | 13 |
| Produce casing pressure 0 | 856 | -1 | 968 | 11 |
| Produce casing pressure 55 | 783 | -10 | 839 | -3 |
Oscillating load screw thread analysis of fatigue
Tubing round thread is during downhole production, since high pressure draught pressure oscillation generates vibration.Underground monitoring instrument point
Under new record difference gas production, vibration acceleration range is between 1.2g~6g.Corresponding amplitude under different vibration accelerations, is shown in figure
5, the lower local ture stress-strain of material actual cycle stress-strain diagram analysis bending obtained using finite element and test, table
8 be screw thread analysis of Fatigue-life.
Table 8: screw thread analysis of Fatigue-life
Known to analysis: increasing with acceleration, screw thread maximum ture stress-strain increases, and plastic strain amplitude improves；Vibration accelerates
Degree is greater than 6g, has the variation of maximum plastic strain amplitude, as vibration acceleration 9g, fatigue life 4,000,000 times at box cupling escape
Less than 10,000,000 times, it is broken easily from screw thread.
Employment and suitability test (E & ST) evaluation
3, specification 1# sample is chosen, according to finite element method (fem) analysis, anti-galling test evaluation is carried out first to screw thread, most
Both ends in minimum and maximum moment of torsion control respectively by detaining afterwards.
1 sample (number 1Z) is successively loaded guarantor's load inspection screw thread gas tightness by underground loading spectrum, and (protecting load basis of time has
Finite element analysis intermediate cycling load step is kept for 15 minutes, and vulnerable leakage link load step, which is protected, to be carried 60 minutes), test result is shown in Table 9, not
It leaks；
Table 9:1Z test load step and result
1 sample (number 2Z) is carried out stretching the airtight testing sealing of lower stress corrosion in kind, test result by corrosive medium environment
See Fig. 6；
1 sample (number 3Z) is by oscillating load 6g load 10,000,000 lower hermetic seals of detection and fatigue fracture performance.
Through above-mentioned verification experimental verification: thread gluing phenomenon does not occur for screw thread；Gas tightness meets underground load working condition needs；Through 720
Hour stretches plus external screw thread nose occurs for the material object stress corrosion (cracking) test of internal pressure corrosive environment medium and shoulder stress corrosion sealing is let out
Leakage；Leakage and macroscopical fatigue fracture do not occur for load 6g acceleration simple harmonic oscillation.
Theoretical finite element analysis is supplemented through above-mentioned operating condition applicability and evaluation test shows screw thread by button meeting in peak torque
Occur stress corrosion sealing leak, underground use should control in adjustment button peak torque as intermediate torque, i.e., most preferably with maximum
Between.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (9)
1. a kind of gas well at HTHP oil pipe hermetic seal screw thread assay method, which is characterized in that according to gas well at HTHP
Underground work environmental characteristic and helicitic texture feature acquire screw thread and seal buckle ring number and increasing on above buckle ring number, torque and shoulder
Torque is measured, is carried out according to screw thread stress stress-strain distribution under the conditions of acquisition data FEM Simulation difference torque wrench moment
The analysis of hermetic seal screw thread torque wrench moment；Using simple harmonic oscillation fatigue tester, internal pressure air pressure is added to survey oscillation intensity according to underground,
Amplitude is loaded, vibration cycles number and plastic strain amplitude are recorded, the leakage of observation thread failure phenomenon or fatigue fracture obtain antifatigue
Analyze data；It is analyzed by hermetic seal screw thread torque wrench moment and determines that limit tolerance sample carries out work respectively under different torque wrench moments
Working condition loading and the evaluation of stress corrosion environment hermetic seal employment and suitability test (E & ST)；
Analysis thread it is defined be not same as above acquisition torque under profile part and enclose the different tolerances of number sunykatuib analysis under screw thread stress-answer
Become distribution situation, then analyzed according to hermetic seal screw thread torque wrench moment, selection limit tolerance and different torques carry out operating loading
Lower gas tightness finite element analysis is composed, underground working loading spectrum hermeticity analysis after detaining on hermetic seal screw thread is carried out；
The vibration acceleration that three parameter testers of vibration detect three direction X, Y, Z is installed in tubing string, according to vibration acceleration meter
Load amplitude is analysed in point counting, is then carried out downhole oil tubing string and is produced the antifatigue analysis of gas production process screw thread dynamic loading, last foundation point
It analyses vulnerable link and determines employment and suitability test (E & ST) assessment process, in the worst tolerance fit of screw thread, in different torque wrench moment items
The reliability being applicable under part and operating loading by analytical calculation and corresponding test evaluation evaluation analysis screw thread.
2. a kind of gas well at HTHP oil pipe hermetic seal screw thread assay method according to claim 1, feature exist
In in the analysis of hermetic seal screw thread torque wrench moment, using ultrasonic echo bounce technique and limited element analysis technique detection length in sealing contact
And pressure, the Line Integral of primary seal contact length and pressure initiation under ibid profile part is compared not respectively determines torque wrench moment to gas
Sealing influence and screw thread combined stress MISES and equivalent plastic strain distribution, determine limit tolerance according to Numerical results
Sample and different torque wrench moments, carry out operating loading and the evaluation of stress corrosion environment hermetic seal employment and suitability test (E & ST) respectively.
3. a kind of gas well at HTHP oil pipe hermetic seal screw thread assay method according to claim 2, feature exist
In torque includes at least minimal torque value, best torque value, intermediate torque value and maximum torque.
4. a kind of gas well at HTHP oil pipe hermetic seal screw thread assay method according to claim 1, feature exist
In underground working loading spectrum hermeticity analysis after being detained on hermetic seal screw thread specifically: carry out underground working loading spectrum leakproofness point
Axial load, internal pressure and external pressure and temperature are analysed while being applied, is connect by material mechanical performance load analysis primary seal under actual temperature
Touch pressure and length and area change, and determine whether its leakproofness is suitable for the operating condition；It is suitable to work out employment and suitability test (E & ST) evaluation loading spectrum
Sequence verifies underground applicability.
5. a kind of gas well at HTHP oil pipe hermetic seal screw thread assay method according to claim 4, feature exist
According to underground various processes condition, operating loading is distributed under the conditions of calculating analysis different depth using tubular buckling, well
It includes testing pressure of well head, packer set, acid fracturing, production gas production and casing pressure that lower oil tube load spectrum tubular buckling, which calculates analysis,
Change lower tubular column different depth position screw thread stress.
6. a kind of gas well at HTHP oil pipe hermetic seal screw thread assay method according to claim 1, feature exist
In the production antifatigue analysis of gas production process screw thread dynamic loading specifically: pass through the antifatigue maximum vibration of analysis selection of screw thread dynamic loading
Screw thread is antifatigue under dynamic acceleration analysis screw thread simple harmonic oscillation bending alternating load and the hermetic seal service life, does not occur by 10,000,000 times
Fracture and leakage are as the applicable interpretational criteria of persistence.
7. a kind of gas well at HTHP oil pipe hermetic seal screw thread assay method according to claim 1, feature exist
In determining that employment and suitability test (E & ST) assessment process is specific as follows:
S401, limit tolerance sample are chosen；
S402, torque wrench moment are determining and anti-galling is tested；
S403, actual measurement material mechanical performance；
S404, the test of underground working loading spectrum and stress corrosion (cracking) test in kind；
S405, simple harmonic oscillation hermetic seal fatigue actual loading test；
S406, finite element and evaluation of test result comprehensive analysis screw thread are applicable in reliability.
8. a kind of gas well at HTHP oil pipe hermetic seal screw thread assay method according to claim 7, feature exist
In in step S403, actual measurement material mechanical performance includes stretching and fatigue behaviour.
9. a kind of gas well at HTHP oil pipe hermetic seal screw thread assay method according to claim 7, feature exist
In step S406 is specific as follows:
A basis of the worst leakproofness parameter coordination as fail-safe analysis) is chosen；Limit deviation is fabricated according to thread parameter
Sample；
B) both ends are distinguished detains on minimum and maximum torque, detects load leakproofness and maximum under screw thread anti-galling and minimal condition
Under the conditions of stress and plastic strain, corrosive environment leakproofness；
C) actual measurement material mechanical property at a room temperature and a high temperature, analysis thread in not ibid button and under the conditions of loading spectrum, screw thread by
Power and strain variation, it is ensured that fail-safe analysis validity；
D) extending test period to easy leakage failure link according to underground working loading spectrum and theory analysis establishment test procedure has
Effect property extends to 60min or more, it is ensured that the safe handling of underground static state operating loading；
E) downhole corrosion environment is simulated in stress corrosion (cracking) test in kind, if end of thread leaks in peak torque；Modification screw thread is set
Parameter error is counted, increases button peak torque in sealing minimum interference amount reduction and reduces stress distribution and deformation；Control torque wrench moment
Range minimum is to median, it is ensured that corrosive environment seal performance；Finally by the worst cooperation theory analysis of product limit tolerance and
Actual loading test verifying evaluation.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1123420A (en) * | 1997-07-01 | 1999-01-29 | Mitsubishi Heavy Ind Ltd | Method for evaluating life of bolt |
| CN203655175U (en) * | 2013-12-23 | 2014-06-18 | 无锡西姆莱斯石油专用管制造有限公司 | Airtight seal threaded connector |
| CN104573212A (en) * | 2014-12-30 | 2015-04-29 | 中国石油天然气集团公司 | Optimization design method for oil casing screwed-joint sealing structure |
| CN105241612A (en) * | 2015-10-19 | 2016-01-13 | 西南石油大学 | Dynamic test device and method for thread sealing performance of oil pipe adapter |
| CN106323611A (en) * | 2016-08-11 | 2017-01-11 | 上海大学 | Method for quickly evaluating torsional property of degraded drill rod connector |
| CN106441760A (en) * | 2016-09-09 | 2017-02-22 | 大连理工大学 | Method for testing anti-loosening characteristic of low-pressure turbine wheel shaft disc connecting bolt |
-
2018
- 2018-04-11 CN CN201810321078.1A patent/CN108982076B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1123420A (en) * | 1997-07-01 | 1999-01-29 | Mitsubishi Heavy Ind Ltd | Method for evaluating life of bolt |
| CN203655175U (en) * | 2013-12-23 | 2014-06-18 | 无锡西姆莱斯石油专用管制造有限公司 | Airtight seal threaded connector |
| CN104573212A (en) * | 2014-12-30 | 2015-04-29 | 中国石油天然气集团公司 | Optimization design method for oil casing screwed-joint sealing structure |
| CN105241612A (en) * | 2015-10-19 | 2016-01-13 | 西南石油大学 | Dynamic test device and method for thread sealing performance of oil pipe adapter |
| CN106323611A (en) * | 2016-08-11 | 2017-01-11 | 上海大学 | Method for quickly evaluating torsional property of degraded drill rod connector |
| CN106441760A (en) * | 2016-09-09 | 2017-02-22 | 大连理工大学 | Method for testing anti-loosening characteristic of low-pressure turbine wheel shaft disc connecting bolt |
Non-Patent Citations (1)
| Title |
|---|
| 张永强 等: "基于API圆螺纹的气密封螺纹开发及评价", 《钻井工程》 * |
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|---|---|---|---|---|
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