CN105784971A - Experimental facility for utilizing anelastic strain recovery method for in situ analysis of aquo-complex settled layer stress state - Google Patents

Experimental facility for utilizing anelastic strain recovery method for in situ analysis of aquo-complex settled layer stress state Download PDF

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Publication number
CN105784971A
CN105784971A CN201610183925.3A CN201610183925A CN105784971A CN 105784971 A CN105784971 A CN 105784971A CN 201610183925 A CN201610183925 A CN 201610183925A CN 105784971 A CN105784971 A CN 105784971A
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China
Prior art keywords
strain
axis
data
testing sample
sample
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CN201610183925.3A
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Chinese (zh)
Inventor
刘卫国
武朝然
宋永臣
李洋辉
骆汀汀
王增
沈实
王磊
吴琪
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大连理工大学
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Priority to CN201610183925.3A priority Critical patent/CN105784971A/en
Publication of CN105784971A publication Critical patent/CN105784971A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24Earth materials
    • G01N33/241Earth materials for hydrocarbon content

Abstract

The invention provides an experimental facility for utilizing an anelastic strain recovery method for in situ analysis of an aquo-complex settled layer stress state. The experimental facility belongs to the field of natural gas hydrate exploitation, and utilizes the anelastic strain recovery method to measure the stress state of an in situ aquo-complex core, wherein the anelastic strain recovery method is characterized by using an isotropic viscoelastic model to technically analyze a three-dimension stress field of a core sample through measuring the elastic strain restored by the in situ core sample. The experimental facility comprises a strain gauge, a water bath, a heating and cooling circulator, a data recorder, a thermistor thermometer and a computer data acquisition system. The experimental facility can truly measure the structure construction and the stress state of the in situ aquo-complex core during the aquo-complex exploitation process, and plays an important guiding role in basic physical property research, exploration and safety exploitation of a natural gas aquo-complex.

Description

A kind of experimental provision using anelastic strain restoration methods in-situ study hydrate deposit stress state
Technical field
The present invention relates to a kind of use anelastic strain recovery (ASR) method in-situ study hydrate deposit mechanical characteristic device, belong to exploitation of gas hydrates field.
Background technology
Along with the huge consumption of petroleum resources, the mankind will face the exhaustion of petroleum resources in later stage 21 century, and global economic development will be faced with formidable challenges.Gas hydrates as a kind of potential clean energy resource, be worldwide distributed because of it wide, reserves are big, it is believed that be the new forms of energy that 21 century is the most desirable, have commercial exploitation prospects.The safe working of gas hydrates is subject to the extensive attention of national governments and research institution, it has also become the new engineering field of deep-sea oil gas development of resources, and likely the development of environmental science and energy industry is produced far-reaching influence.
In natural gas hydrate exploration with recovery process, decomposition of hydrate can destroy the structural stability of deposition layer, and along with the extension of decomposition region in recovery process, it is likely to bring out the geological disaster such as stratum deformation, submarine landslide, in turn results in damage and the life and property loss of the infrastructure such as drilling equipment, submarine pipeline.Geomechanics is the important research field of Oceanic methane hydrate development of resources.The decomposition of methane hydrate can cause the change of deposition layer mechanical characteristic in process of production, and natural gas extraction also can be produced puzzlement greatly by these changes, so the stress state of hydrate deposit is the important reference of mining technology project and production efficiency Optimization Plan.
Stress is the important parameter characterizing mechanical property, is the important indicator of drilling parameter detection, and 2004 in Nankai Trough hydrate exploration, utilizes original position hydraulic pressure burst test, directly measures drilling hole stress state.2013, the position near natural gas extraction well sites, the method utilizing shear wave splitting and breakthrough, indirectly measure drilling hole stress state.The data that twice test obtains show, the stress state of this area is that normal fault type is along with slightly anisotropic horizontal stress.Under normal circumstances, drilling through recovery core specimen from deeper subsurface, core sample, once take out from stratum, is just unable to maintain that its in-situ stress.But, the release of the in-situ stress that the structure change of hydrate sediment causes is detectable.Therefore, may remain in the feature message of Original strata stress in the deposit of recovery.But up to now, can measuring hydrated in-situ sediment structure structure and stress state in the real recovery process of hydrate but without a kind of method, therefore, the method that this application proposes, is the method for an innovation.
Summary of the invention
In order to overcome above-mentioned problems of the prior art, the present invention utilizes anelastic strain to recover (ASR) method and measures the stress state of hydrated in-situ thing rock core.It is a kind of 3-D stree field by using isotropism viscoelastic model technical Analysis core sample that anelastic strain recovers (ASR) method, the method measuring the elastic strain that original position core sample recovers.Main thought in the method is the moment that the elastic strain caused from stress discharges, and the strain of rock core subsequently is progressively or time dependent deformation, and namely anelastic strain recovers.In principle, anelastic strain is caused by the induction by stress discharged in rock core drilling process.Therefore, namely the stress state of rock core measured by ASR is the stress state (cored the time) suffered by rock core at that time.For isotropic viscoelastic material, the direction of three original position principal directions of stress and three main anelastic strains is consistent.Therefore, based on the anelastic strain data measured at least six independent, direction, may determine that its original position principal direction of stress by calculating principal strain directions.
Technical scheme:
A kind of experimental provision using anelastic strain restoration methods in-situ study hydrate deposit stress state, this experimental provision includes strain gauge, water bath, heating cool cycles device, data logger, thermistor thermometer and computer data acquisition system;
The temperature of sample in water bath is controlled by heating cool cycles device, thermistor thermometer it is provided with in water bath, the data of its collection are transmitted to data logger, physical signalling is converted to the signal of telecommunication by strain transducer, and the signal of telecommunication is converted into displayable digitized binary data again and is shown on data logger;Testing sample is by double-layer plastic bag and aluminium flake parcel, it is placed in water bath, two intersections of testing sample side surface are met at along the X-axis of testing sample and the tangent plane at Y-axis place, the X-axis of described testing sample is a radial coordinate axle on testing sample circular cross section, the Y-axis of described testing sample is the radial coordinate axle being perpendicular to X-axis on the circular cross section of place, at least provided with a unitary type strain gauge with at least provided with three chiasma type strain gauges on every intersection, the anelasticity normal strain in measuring samples X-axis with Y direction of the unitary type strain gauge, chiasma type strain gauge is used for measuring sample Z axis, anelasticity normal strain on XZ and YZ direction, the Z axis of described testing sample is the axis of testing sample;Tangent plane along the X-axis of testing sample and the angular bisector place of Y-axis meets at two intersections of sample side surface, at least provided with two unitary type strain gauges on every intersection, for measuring the anelasticity normal strain on sample XY direction;The data of strain gauge collection are transferred to data logger by strain transducer;Computer data acquisition system is connected with data logger, by memory card, temperature and strain data is uploaded to computer data acquisition system, temperature and strain data is processed and controls.
Beneficial effects of the present invention:
1. can accurately be measured the anelastic normal strain in six independent directions of testing sample by staggered form type strain gauge and unitary type strain gauge, reach requirement of experiment.
2. wrapped up by testing sample by double-ply bag plastic bag and aluminium flake and be immersed in described water-bath, it is ensured that preventing from causing any possible deformation because of dry, it is ensured that experimentation measurement data is accurate.
3. by controlling the temperature of recirculated water bath, to ensure the temperature requirement under experimental simulation in-situ condition.
4. by data logger, every 10 minutes record corresponding datas;To ensure the real time record of experimental data, it is possible to record time dependent strain, to reach requirement of experiment.
5. can be recorded temperature and strain in real time by data logger simultaneously, facilitate experiment to carry out.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of Experimental equipment using anelastic strain restoration methods in-situ study hydrate sediment stress state.
In figure: 1 data logger;2 thermistor thermometers;3 heating cool cycles devices;4 strain transducers;5 water baths;6 testing samples;7 computer data acquisition systems.
Detailed description of the invention
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing and technical scheme.
Described strain gauge is generally made up of sensitive grid, lead-in wire, binding agent, substrate and cap rock, it is arranged on each testing sample X-axis, the tangent plane at Y-axis place meets at two intersections and the X-axis of sample side surface, and the tangent plane at the angular bisector place of Y-axis meets on two intersections of sample side surface.Testing sample is wrapped up by double-ply bag plastic bag and aluminium flake and is immersed in described water-bath and keeps core sample water content constant, it is ensured that prevent from causing any possible deformation because of dry, it is ensured that experimentation measurement data is accurate.
Fig. 1 is a kind of experiment device schematic diagram using anelastic strain to recover (ASR) method in-situ study hydrate sediment stress state.It is illustrated by system shown in figure below:
(1) 4 strain transducer and 1 data logger are connected, and 4 strain transducers are connected with the chiasma type strain gauge on testing sample 6 and unitary type strain gauge.Every 10 minutes record corresponding datas, real time record sample strains over time.
(2) testing sample 6 is wrapped up by double-ply bag plastic bag and aluminium flake and is placed in 5 water baths, keeps core sample water content constant.5 water baths and 3 heating cool cycles devices are connected, it is ensured that water bath experimental temperature.Simulation mining is in-situ temperature condition.
(3) 2 thermistor thermometers are placed in 5 water baths, and link with 1 data logger, meanwhile, 4 strain transducers and 1 data logger are connected, strain and these physical signallings of temperature are transferred in data logger and carry out data process obtain digital signal, carry out data again and show and storage after the incoming computer 7 of digital signal.
Native system duty is good, it is possible to measure structure structure and the stress state of hydrated in-situ thing rock core in the recovery process of hydrate truly.The Basic Physical Properties of gas hydrates is studied, explores and safe working plays important directive function.

Claims (1)

1. the experimental provision using anelastic strain restoration methods in-situ study hydrate deposit stress state, it is characterized in that, this experimental provision includes strain gauge, water bath, heating cool cycles device, data logger, thermistor thermometer and computer data acquisition system;
The temperature of sample in water bath is controlled by heating cool cycles device, thermistor thermometer it is provided with in water bath, the data of its collection are transmitted to data logger, physical signalling is converted to the signal of telecommunication by strain transducer, and the signal of telecommunication is converted into displayable digitized binary data again and is shown on data logger;Testing sample is by double-layer plastic bag and aluminium flake parcel, it is placed in water bath, two intersections of testing sample side surface are met at along the X-axis of testing sample and the tangent plane at Y-axis place, the X-axis of described testing sample is a radial coordinate axle on testing sample circular cross section, the Y-axis of described testing sample is the radial coordinate axle being perpendicular to X-axis on the circular cross section of place, at least provided with a unitary type strain gauge with at least provided with three chiasma type strain gauges on every intersection, the anelasticity normal strain in measuring samples X-axis with Y direction of the unitary type strain gauge, chiasma type strain gauge is used for measuring sample Z axis, anelasticity normal strain on XZ and YZ direction, the Z axis of described testing sample is the axis of testing sample;Tangent plane along the X-axis of testing sample and the angular bisector place of Y-axis meets at two intersections of sample side surface, at least provided with two unitary type strain gauges on every intersection, for measuring the anelasticity normal strain on sample XY direction;The data of strain gauge collection are transferred to data logger by strain transducer;Computer data acquisition system is connected with data logger, by memory card, temperature and strain data is uploaded to computer data acquisition system, temperature and strain data is processed and controls.
CN201610183925.3A 2016-03-25 2016-03-25 Experimental facility for utilizing anelastic strain recovery method for in situ analysis of aquo-complex settled layer stress state CN105784971A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106768581A (en) * 2017-01-22 2017-05-31 孙东生 A kind of horizontal stress coefficient of variation measuring method and device
CN106768580A (en) * 2017-01-22 2017-05-31 孙东生 A kind of horizontal stress measuring method and device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106768581A (en) * 2017-01-22 2017-05-31 孙东生 A kind of horizontal stress coefficient of variation measuring method and device
CN106768580A (en) * 2017-01-22 2017-05-31 孙东生 A kind of horizontal stress measuring method and device
CN106768580B (en) * 2017-01-22 2019-07-05 孙东生 A kind of horizontal stress measurement method and device
CN106768581B (en) * 2017-01-22 2019-07-05 孙东生 A kind of horizontal stress coefficient of variation measurement method and device

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