CN105510148A - Device for testing packer rubber barrel contact stress at high temperature and method thereof - Google Patents

Device for testing packer rubber barrel contact stress at high temperature and method thereof Download PDF

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Publication number
CN105510148A
CN105510148A CN201410505340.XA CN201410505340A CN105510148A CN 105510148 A CN105510148 A CN 105510148A CN 201410505340 A CN201410505340 A CN 201410505340A CN 105510148 A CN105510148 A CN 105510148A
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China
Prior art keywords
temperature
strain
stress
packing
test
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Pending
Application number
CN201410505340.XA
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Chinese (zh)
Inventor
彭志刚
马明新
李国锋
徐鑫
李铭
冯德杰
刘传永
刘建
许婵婵
张建国
李硕
张磊
齐志刚
邵茹
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China Petrochemical Corp
Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Original Assignee
China Petrochemical Corp
Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
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Application filed by China Petrochemical Corp, Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp filed Critical China Petrochemical Corp
Priority to CN201410505340.XA priority Critical patent/CN105510148A/en
Publication of CN105510148A publication Critical patent/CN105510148A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a device for testing packer rubber barrel contact stress at high temperature and a method thereof. According to the invention, testing temperature is set through a high-temperature cabinet; steady load is applied through an AC servo system device; a rubber material of the packer rubber barrel is compressed to deform and contacts with the outer tube wall to generate stress deformation; strain data of outer tube wall surface feature points under externally-applied acting force is measured; and contact stress distribution law of the packer rubber and the outer tube wall is calculated by a finite element method through a stress data analysis system, so as to analyze variation law of the packer barrel rubber material contact stress with temperature. Underground high-temperature working condition can be simulated to make the testing process to be more accordant with the actual working status. By the device, testing of packer rubber barrel contact stress is realized; strain data of the packer rubber barrel surface feather points under the externally-applied acting force can be measured; and stress, magnitude of strain and distribution law can be obtained by the stress data analysis system. The device has a simple structure, is convenient to operate, works reliably and has high precision.

Description

A kind of high temperature lower packet packing element contact stress proving installation and method
Technical field
The present invention relates to a kind of in subsurface tool proving installation and method field for high temperature lower packet packing element contact stress proving installation and utilize this proving installation to carry out the method for contact stress test.
Background technology
Packer is under the operating mode of down-hole High Temperature High Pressure, the high temperature resistant mechanical property of packing element seems particularly important, therefore to subsurface tool simulation underground working, carry out High-Temperature Strengthening test and Data Detection, not only significant to developing of subsurface tool, to the packer promoted the use of, regularly carry out sampling Detection, guarantee that it is safe and reliable, be also absolutely necessary.
The future developments such as the subsurface tool testing equipment of current domestic and international each oil field and company is all accurate towards simulated conditions, means of testing is complete, test data is complete, measuring accuracy is high.At present, the simulation test of drill and petroleum extraction tools and technology and equipment is as basis and the important component part of drill and petroleum extraction tools research in oilfield exploitation procedure.Sealing and the grappling performance testing device of building packer carry out multiple down-hole drill and petroleum extraction tools and the requisite research technique of technical study.
In a word, physical simulation experiment is only had could to obtain semipilot data that are that site test cannot obtain or that can not obtain within short-term; Also only have simulation test could greatly shorten the scientific research cycle, effectively overcome and just new product, new technology are dropped into the drawback that produced on-site well uses without any semipilot.Thus the idle operation that some can be avoided unnecessary and economic loss, make scientific payoffs have more science, reliability, practicality and economy.
Summary of the invention
Object of the present invention is exactly for prior art present situation, proposes a kind of high temperature lower packet packing element contact stress proving installation and method of highly effective.
Technology path of the present invention is: because packing element contact position is at inside pipe casing, generally directly cannot test its contact force value, but contact force can make casing deformation, the size of the deform reaction of sleeve surface interior contact power and distribution situation, as long as therefore measure the distortion of sleeve surface, just inside pipe casing contact force can be extrapolated.Test temperature is set by temp controlled meter, electric heater in high-temperature cabinet heats sample, after temperature stabilization, by AC servo device, setting load is applied to packing element, packing rubber sleeve outer tube wall hoop sticking high-temperature strain plate, AC servo keeps setting stable load a period of time, measures the strain data of packing rubber sleeve outer tube wall surface characteristics point in this process, is transferred to stress data analytic system carries out analytical calculation by strain analysis instrument collection strain value.
Its concrete scheme comprises:
First, a kind of high temperature lower packet packing element contact stress proving installation comprises, test casing, packing element, high-temperature cabinet, charger, load bar, crossbeam, pressure transducer, strain analysis instrument, strain analysis computing machine and supporter; Wherein: test casing is arranged on bottom and reinforces in closed experiment thimble; Experiment thimble is arranged in high-temperature cabinet together with the packing element in it, in high-temperature cabinet, well heater is set, the outer wall of high-temperature cabinet arranges insulation material, the top of high-temperature cabinet is run through load bar, load bar connects on crossbeam above it, be connected with pressure transducer between load bar and crossbeam, crossbeam is connected with the supporter of high-temperature cabinet outside, and load bar and the packing element in experiment thimble form longitudinal extruding and coordinate; Strain analysis instrument is with multiple foil gauge, and multiple foil gauge is pasted onto on the outer wall of experiment thimble by interval, and foil gauge is connected with strain analysis instrument by high temperature resistant wire, and strain analysis instrument and strain analysis computing machine connect; Described charger is arranged between crossbeam and supporter, or be arranged between crossbeam and load bar, or to be arranged on bottom experiment thimble and bottom high-temperature cabinet between, or to be connected to bottom experiment thimble and between supporter by the support bar run through bottom high-temperature cabinet.
Such scheme also comprises: the linear drive motor that described charger is made up of AC servo motor and driving ball screw.High-temperature cabinet adopt thermopair as well heater, and be connected with temperature controller realize temperature automatically controlled; Have dodge gate before high-temperature cabinet casing, door limit adopts thermostable fluorine rubber seal; High-temperature cabinet is upper and lower when needing to run through load bar or support bar time, its circular hole adopts high temperature resistant asbestos yarn to seal.Crossbeam and supporter adopt track and pulley to be connected.
Secondly, according to the method for testing of above-mentioned high temperature lower packet packing element contact stress proving installation be: test temperature in setting high-temperature cabinet, after test temperature is stable, by charger to the packing element setting loading force in experiment thimble and loading force stabilization time, record packing rubber sleeve surface characteristics point carry acting force outside under strain data, the test figure collected is transferred on strain analysis computing machine by strain analysis instrument, stress, the size of strain and the regularity of distribution is calculated by stress data analytic system, and temperature variant rule.
The computing method of described stress data analytic system are as follows:
If sleeve surface has n test point, internal surface of sleeve pipe effect, along the acting force P having hoop direction, acts on the contact force P at arbitrary test point i place i, at P iunder independent role, the strain of each test point is respectively ε i, when P continuous distribution is on test point 1 ~ i, then the strain of arbitrary test point i place equals the strain stress sum that each point contact force causes i point, calculates this value by Finite Element Method;
If the strain of 1 to No. 15 foil gauges is followed successively by ε 1× 10 -6, ε 2× 10 -6, ε 3× 10 -6, ε 4× 10 -6... .. ε 15× 10 -6, the interior pressure of sleeve inner and each foil gauge corresponding position is designated as p respectively 1, p 2, p 3... p 15, unit is MPa, and the data matrix in order to inverse packing element and experiment thimble contact stress is set to J, and the inverse matrix of note J is J -1, and
Make { ε }=[ε 1ε 2ε 3ε 4ε 5ε 6ε 7ε 8ε 9ε 10ε 11ε 12ε 13ε 14ε 15] t
{p}=[p 1p 2p 3p 4p 5p 6p 7p 8p 9p 10p 11p 12p 13p 14p 15] T
Then { p}=J -1{ ε }
Test is recorded strain numerical value and substitute into above formula, namely can be regarded as to obtain the sleeve lining compressive stress at corresponding foil gauge place.
Principle of the present invention is for set test temperature by high-temperature cabinet, by charger imposed load, record packing rubber sleeve outer tube wall surface characteristics point carry acting force outside under strain data, finite Element Stress computing system is utilized to draw stress, the size of strain and the regularity of distribution, and temperature variant rule, test comprises the data such as packing element strain, axial displacement, test temperature.
Advantage of the present invention and technique effect:
(1) can worst hot case under simulation well, make the more realistic working condition of process of the test.
(2) test of packing element contact stress is achieved, can record packing rubber sleeve surface characteristics point carry acting force outside under strain data, stress data analytic system is utilized to draw stress, the size of strain and the regularity of distribution, test data comprises the strain of packing element, axial displacement, test temperature.
(3) apparatus structure of the present invention is simple, easy to operate, reliable operation, degree of accuracy are higher, serviceable life is longer, achieve the small-size multifunction feature of rubber performance proving installation under hot conditions, hold facility scope is little, and experimentation cost is low, is suitable for laboratory experiment evaluation.
Accompanying drawing explanation
Fig. 1 is a kind of device example structure sketch of the present invention.
In Fig. 1: 21, packing element and test casing part; 22, high-temperature cabinet; 23, charger; 24, strain analysis instrument; 25, strain analysis computing machine; 26, crossbeam; 27, pressure transducer; 28, load bar; 29, touch display.
Fig. 2 is the enlarged drawing of packing element in Fig. 1 and test casing part.
In Fig. 2: 1,2,3,4 ... 15, high temperature strain foil; 16, test casing; 17, packing element.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail:
Shown in Fig. 1,2, in this test unit, packing element 17 is contained in inside test casing 16.Test casing 16 is placed in high-temperature cabinet 22 li, and high-voltaghe compartment 22 is arranged on supporter inside.Test casing 16 is from the bottom to top in axial direction every 10mm sticking high-temperature strain plate (1 ... 15), for convenience of the record of data during test, be connected on strain analysis instrument 24 by high temperature wire after its numbering.Be provided with AC servo motor in charger 23 and drive ball screw, and being acted on bottom experiment thimble 16 by support bar and reinforce blind end.By load bar 28 pairs of packing element imposed loads after crossbeam 26 bottom Bonding pressure sensor 27.Test figure is connected on strain analysis computing machine 55 by data line by strain analysis instrument 24, touch display 29 is opened testing software and can start test.
Its method of testing: set test temperature by high-temperature cabinet, after test temperature is stable, logical testing software setting loading force and loading force stabilization time, start-up loading device 23 pairs of packing element imposed loads, stable load keeps 0.1 ~ 0.5min, record packing rubber sleeve surface characteristics point carry acting force outside under strain data, the test figure collected is transferred on strain analysis computing machine by strain analysis instrument, stress, the size of strain and the regularity of distribution is drawn by stress data analytic system, and temperature variant rule.Concrete finite element method is as follows:
If sleeve surface has n test point, internal surface of sleeve pipe effect, along the acting force P having hoop direction, acts on the contact force P at arbitrary test point i place i.At P iunder independent role, the strain of each test point is respectively ε i.When P continuous distribution is on test point 1 ~ i, then the strain of arbitrary test point i place equals the strain stress sum that each point contact force causes i point.
Foil gauge numbering is as Fig. 2, and sleeve bottom is 1,2,3,4,5,6 successively to top ... .15 number foil gauge.If the strain of 1 to No. 15 foil gauges is followed successively by ε 1× 10 -6, ε 2× 10 -6, ε 3× 10 -6, ε 4× 10 -6... .. ε 15× 10 -6, the interior pressure of sleeve inner and each foil gauge corresponding position is designated as p respectively 1, p 2, p 3... p 15, unit is MPa.Data matrix in order to inverse glue post and barrel contacts stress is set to J, and the inverse matrix of note J is J -1, and
Make { ε }=[ε 1ε 2ε 3ε 4ε 5ε 6ε 7ε 8ε 9ε 10ε 11ε 12ε 13ε 14ε 15] t
{p}=[p 1p 2p 3p 4p 5p 6p 7p 8p 9p 10p 11p 12p 13p 14p 15] T
Then { p}=J -1{ ε }
Namely p 1 p 2 p 3 p 4 p 5 p 6 p 7 p 8 p 9 p 10 p 11 p 12 p 13 p 14 p 15 = J - 1 ϵ 1 ϵ 2 ϵ 3 ϵ 4 ϵ 5 ϵ 6 ϵ 7 ϵ 8 ϵ 9 ϵ 10 ϵ 11 ϵ 12 ϵ 13 ϵ 14 ϵ 15
Test is recorded strain numerical value and substitute into above formula, namely can be regarded as to obtain the sleeve lining compressive stress at corresponding foil gauge place.
For the strain numerical value testing the foil gauge recorded under different temperatures, first should give process in advance to data matrix, be undertaken programming by computing formula sequencing by computing machine, better calculate use to facilitate.
On the basis of above-described embodiment, test casing outer wall axial direction is every 10mm sticking high-temperature strain plate, and high temperature strain foil is connected with strain analysis instrument by higher temperature line; With the rising of temperature in strain testing, the thermal output of foil gauge also will increase, and this is the major reason affecting high-temp strain measuring accuracy.For improving the measuring accuracy of foil gauge, reduce thermal output, adopt the method for public compensation in testing, namely a foil gauge is the method that multiple active gage carries out temperature compensation.Independent making one section and the sleeve of test casing with material, paste a high temperature strain foil above as compensating plate, adopt Hui Sitong half bridge circuit to be connected with strain analysis instrument, and strain value is outputted in program of finite element, to increase FEM (finite element) calculation precision.

Claims (6)

1. a high temperature lower packet packing element contact stress proving installation, is characterized in that comprising test casing, packing element, high-temperature cabinet, charger, load bar, crossbeam, pressure transducer, strain analysis instrument, strain analysis computing machine and supporter; Wherein: test casing is arranged on bottom and reinforces in closed experiment thimble; Experiment thimble is arranged in high-temperature cabinet together with the packing element in it, in high-temperature cabinet, well heater is set, the outer wall of high-temperature cabinet arranges insulation material, the top of high-temperature cabinet is run through load bar, load bar connects on crossbeam above it, be connected with pressure transducer between load bar and crossbeam, crossbeam is connected with the supporter of high-temperature cabinet outside, and load bar and the packing element in experiment thimble form longitudinal extruding and coordinate; Strain analysis instrument is with multiple foil gauge, and multiple foil gauge is pasted onto on the outer wall of experiment thimble by interval, and foil gauge is connected with strain analysis instrument by high temperature resistant wire, and strain analysis instrument and strain analysis computing machine connect; Described charger is arranged between crossbeam and supporter, or be arranged between crossbeam and load bar, or to be arranged on bottom experiment thimble and bottom high-temperature cabinet between, or to be connected to bottom experiment thimble and between supporter by the support bar run through bottom high-temperature cabinet.
2. high temperature lower packet packing element contact stress proving installation according to claim 1, is characterized in that: the linear drive motor that described charger is made up of AC servo motor and driving ball screw.
3. high temperature lower packet packing element contact stress proving installation according to claim 2, is characterized in that: high-temperature cabinet adopt thermopair as well heater, and be connected with temperature controller realize temperature automatically controlled; Have dodge gate before high-temperature cabinet casing, door limit adopts thermostable fluorine rubber seal; High-temperature cabinet is upper and lower when needing to run through load bar or support bar time, its circular hole adopts high temperature resistant asbestos yarn to seal.
4. high temperature lower packet packing element contact stress proving installation according to claim 3, is characterized in that: crossbeam and supporter adopt track and pulley to be connected.
5. according to the method for testing of the high temperature lower packet packing element contact stress proving installation described in the arbitrary claim of 1-4, it is characterized in that: test temperature in setting high-temperature cabinet, after test temperature is stable, by charger to the packing element setting loading force in experiment thimble and loading force stabilization time, record packing rubber sleeve surface characteristics point carry acting force outside under strain data, the test figure collected is transferred on strain analysis computing machine by strain analysis instrument, stress is calculated by stress data analytic system, the size of strain and the regularity of distribution, and temperature variant rule.
6., according to the method for testing of high temperature lower packet packing element contact stress proving installation according to claim 5, it is characterized in that the computing method of described stress data analytic system are as follows:
If sleeve surface has n test point, internal surface of sleeve pipe effect, along the acting force P having hoop direction, acts on the contact force P at arbitrary test point i place i, at P iunder independent role, the strain of each test point is respectively ε i, when P continuous distribution is on test point 1 ~ i, then the strain of arbitrary test point i place equals the strain stress sum that each point contact force causes i point, calculates this value by Finite Element Method;
If the strain of 1 to No. 15 foil gauges is followed successively by ε 1× 10 -6, ε 2× 10 -6, ε 3× 10 -6, ε 4× 10 -6... .. ε 15× 10 -6, the interior pressure of sleeve inner and each foil gauge corresponding position is designated as p respectively 1, p 2, p 3... p 15, unit is MPa, and the data matrix in order to inverse packing element and experiment thimble contact stress is set to J, and the inverse matrix of note J is J -1, and
Make { ε }=[ε 1ε 2ε 3ε 4ε 5ε 6ε 7ε 8ε 9ε 10ε 11ε 12ε 13ε 14ε 15] t
{p}=[p 1p 2p 3p 4p 5p 6p 7p 8p 9p 10p 11p 12p 13p 14p 15] T
Then { p}=J -1{ ε }
Test is recorded strain numerical value and substitute into above formula, namely can be regarded as to obtain the sleeve lining compressive stress at corresponding foil gauge place.
CN201410505340.XA 2014-09-27 2014-09-27 Device for testing packer rubber barrel contact stress at high temperature and method thereof Pending CN105510148A (en)

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CN106248369A (en) * 2016-10-10 2016-12-21 西南石油大学 A kind of mechanical load formula packing element unit experiment measurement apparatus
CN107084821A (en) * 2017-07-03 2017-08-22 中国石油大学(华东) A kind of HTHP horizontal well packer simulation test device
CN108256160A (en) * 2017-12-21 2018-07-06 中国石油天然气集团公司 A kind of Forecasting Methodology of thermal recovery operating mode Special threading connector compression in sealing contact
CN108287111A (en) * 2017-01-09 2018-07-17 中国石油化工股份有限公司 Device for the packing performance for detecting packing element
CN108732022A (en) * 2017-04-25 2018-11-02 中国石油化工股份有限公司 Device and method for the test of packer pressure-bearing
CN110095219A (en) * 2019-05-15 2019-08-06 清华大学 A kind of packing element contact force test device

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105910901A (en) * 2016-05-04 2016-08-31 中国人民解放军国防科学技术大学 Compression stress relaxation test apparatus for rubber test specimens
CN106248369A (en) * 2016-10-10 2016-12-21 西南石油大学 A kind of mechanical load formula packing element unit experiment measurement apparatus
CN108287111A (en) * 2017-01-09 2018-07-17 中国石油化工股份有限公司 Device for the packing performance for detecting packing element
CN108732022B (en) * 2017-04-25 2021-01-05 中国石油化工股份有限公司 Device and method for packer pressure bearing test
CN108732022A (en) * 2017-04-25 2018-11-02 中国石油化工股份有限公司 Device and method for the test of packer pressure-bearing
CN107084821A (en) * 2017-07-03 2017-08-22 中国石油大学(华东) A kind of HTHP horizontal well packer simulation test device
CN107084821B (en) * 2017-07-03 2019-03-29 中国石油大学(华东) A kind of high temperature and pressure horizontal well packer simulation test device
CN108256160A (en) * 2017-12-21 2018-07-06 中国石油天然气集团公司 A kind of Forecasting Methodology of thermal recovery operating mode Special threading connector compression in sealing contact
CN108256160B (en) * 2017-12-21 2021-04-30 中国石油天然气集团公司 Prediction method for sealing contact pressure stress of special threaded joint under thermal recovery working condition
CN110095219A (en) * 2019-05-15 2019-08-06 清华大学 A kind of packing element contact force test device
CN110095219B (en) * 2019-05-15 2020-04-28 清华大学 Packer packing element contact force testing arrangement

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Application publication date: 20160420