CN107271349A - A kind of rock parameter assay method under supercritical carbon dioxide saturation - Google Patents

A kind of rock parameter assay method under supercritical carbon dioxide saturation Download PDF

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Publication number
CN107271349A
CN107271349A CN201710589332.1A CN201710589332A CN107271349A CN 107271349 A CN107271349 A CN 107271349A CN 201710589332 A CN201710589332 A CN 201710589332A CN 107271349 A CN107271349 A CN 107271349A
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CN
China
Prior art keywords
plug
test specimen
carbon dioxide
supercritical carbon
hand
Prior art date
Application number
CN201710589332.1A
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Chinese (zh)
Inventor
张广清
王元元
蒋永旺
林莹
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中国石油大学(北京)
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Application filed by 中国石油大学(北京) filed Critical 中国石油大学(北京)
Priority to CN201710589332.1A priority Critical patent/CN107271349A/en
Publication of CN107271349A publication Critical patent/CN107271349A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12Pressure testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0019Compressive
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003Generation of the force
    • G01N2203/0042Pneumatic or hydraulic means
    • G01N2203/0048Hydraulic means

Abstract

A kind of rock parameter assay method under supercritical carbon dioxide saturation, comprises the following steps:Rock material is processed into the test specimen of preliminary dimension, is positioned in seal rubber sleeve, the two ends of seal rubber sleeve are sheathed on left plug and right plug;Grip sleeve is sheathed on left plug, seal rubber sleeve and right plug, its two ends correspondence is mutually touched by left end set and right-hand member set with left plug, right plug, it forms a ring cavity between seal rubber sleeve, right plug can cover relative to right-hand member to be moved;Hydraulic oil is filled into ring cavity by the liquid injection hole opened up on the wall of grip sleeve side, and oil temperature is maintained into the temperature value of setting, the confined pressure for making hydraulic oil apply test specimen is in the confined pressure value of setting;Axial compressive force is applied to right plug, right plug is compressed test specimen;Inject supercritical carbon dioxide fluid in the filling passage of plug and right plug to the left respectively, and record the supercritical carbon dioxide fluid volume into test specimen;After off-test, the confined pressure and axle pressure of test specimen are removed, experiment is completed.

Description

A kind of rock parameter assay method under supercritical carbon dioxide saturation

Technical field

It is full in particular to a kind of supercritical carbon dioxide the invention belongs to hydrocarbon reservoir development and Geotechnical Engineering field Rock parameter assay method with.

Background technology

In oil-gas mining operation, low hole, hypotonic characteristic due to shale gas reservoir, exploitation shale gas must carry out reservoir Pressure break and anatonosis.Successfully the U.S. of exploitation shale gas mainly uses hydraulic fracturing technology at present, but the technology needs to consume a large amount of Water resource, it is and serious to underground water pollution;Chinese shale clay content is universal higher simultaneously, and shale meets the expansive characteristic of water Also reservoir reconstruction effect can be influenceed.In addition, the current explored shale gas reserves of China are distributed in water resource and compare shortage mostly Basin, mountain area, these regions carry out shale gas exploitation also face water resource in terms of challenge.

Wherein, when the temperature and pressure of carbon dioxide is respectively at 31.10 DEG C and more than 7.38MPa, carbon dioxide will Reach supercriticality.Because supercritical carbon dioxide has the diffusivity of similar gas and the density of liquid and dissolving power, together When have the characteristics such as low viscosity, low surface tension concurrently, with superpower flowing, infiltration and transfer performance, clear water conduct can be replaced Fracturing fluid.However, the research in terms of due to the theory of supercritical carbon dioxide pressure break shale and experiment is all also seldom, particularly lack Weary corresponding experimental provision come simulate reservoir permeability during supercritical carbon dioxide pressure break shale, stress, strain change Rule, limits application of the carbon dioxide in shale gas exploitation.

In view of this, the present inventor develops a kind of super according to the production design experiences for being engaged in this area and association area Rock parameter assay method under critical carbon dioxide saturation, to solve the problem of prior art is present.

The content of the invention

The purpose of the present invention is to be to provide the rock parameter assay method under a kind of supercritical carbon dioxide saturation, can Under simulated formation high temperature, high-stress state state, the correlative study of rock parameter under supercritical carbon dioxide is realized, subsequently should be With creating conditions.

Therefore, the present invention proposes the rock parameter assay method under a kind of supercritical carbon dioxide saturation, it is applied to one On clamping device, the clamping device includes a left plug, a seal rubber sleeve, a left plug and a grip sleeve, the left side The rock parameter being formed with respectively in axial direction on plug and right plug under a filling passage, the supercritical carbon dioxide saturation is surveyed Determine method following steps:

A) rock material is processed into the test specimen of preliminary dimension, is positioned in the seal rubber sleeve, the seal rubber sleeve Two ends are sheathed on the left plug and right plug, set a porous backing plate respectively at the two ends of the test specimen, porous described in two Backing plate correspondence and the end of the left plug and right plug fit;

B) grip sleeve is sheathed on the left plug, the seal rubber sleeve and the right plug, its two ends pair Should mutually it be touched with the left plug, right plug by left end set and right-hand member set, it forms a ring cavity, institute between the seal rubber sleeve Movement can be covered relative to the right-hand member by stating right plug;

C) hydraulic oil is filled into the ring cavity by the liquid injection hole opened up on the wall of the grip sleeve side, and oil temperature is tieed up The temperature value in setting is held, the confined pressure for making hydraulic oil apply test specimen is in the confined pressure value of setting;

D) axial compressive force is applied to the right plug, the right plug is compressed the test specimen, until the axial compressive force reaches To setting value;

E) filling passage respectively into the filling passage of the left plug and right plug injects overcritical with first pressure CO 2 fluid, after the supercritical carbon dioxide in the test specimen reaches saturation, the injection pressure of the left closure is carried Second pressure is risen to, stream of supercritical carbon dioxide amount is recorded;

F) after off-test, it is exhausted by the filling passage on left plug, and pass through the fluid injection of the grip sleeve Hole discharge opeing, removes the confined pressure and axle pressure of the test specimen, according to the supercritical carbon dioxide fluid volume entered in the test specimen, meter The supercritical carbon dioxide permeability of test specimen is calculated, experiment is completed.

The present invention also proposes the rock parameter assay method under a kind of supercritical carbon dioxide saturation, and it is applied to a clamping On device, the clamping device includes a left plug, a seal rubber sleeve, a left plug and a grip sleeve, the left plug And the rock parameter measure side under a filling passage, the supercritical carbon dioxide saturation is formed with right plug respectively in axial direction Method following steps:

A) rock material is processed into the test specimen of preliminary dimension, is positioned in the seal rubber sleeve, the seal rubber sleeve Two ends are sheathed on the left plug and right plug, set a porous backing plate respectively at the two ends of the test specimen, porous described in two Backing plate correspondence and the end of the left plug and right plug fit;

B) grip sleeve is sheathed on the left plug, the seal rubber sleeve and the right plug, its two ends pair Should mutually it be touched with the left plug, the right plug by left end set and right-hand member set, it forms a ring between the seal rubber sleeve Chamber, the right plug can cover relative to the right-hand member to be moved;

C) hydraulic oil is filled into the ring cavity by the liquid injection hole opened up on the wall of the grip sleeve side, and oil temperature is tieed up The temperature value in setting is held, the confined pressure that hydraulic oil applies to the test specimen is in predetermined confined pressure;

D) axial compressive force is applied to the right plug, the right plug is compressed the test specimen, afterwards, respectively to the left side The filling passage of plug, the interior injection supercritical carbon dioxide fluid of filling passage of the right plug, make the carbon dioxide stream Body enters in the test specimen, until the pore pressure in the test specimen reaches saturation;

E) axial compressive force is applied to the test specimen by the mobile right-hand member set, the test specimen is in the presence of axial compressive force Deform, the axial shift measuring instrument set between the right plug is covered by the right-hand member, measure the right plug 4 Displacement, then obtain the decrement of the test specimen, wherein, in test process, record each axial pressure value of loading with The corresponding axial compression amount of the test specimen;

F) according to loading axial compressive force and the record data of test specimen axial compression amount, the test specimen is calculated overcritical two Modulus of elasticity and triaxial shear strength under carbonoxide saturation conditions.

Rock parameter assay method under supercritical carbon dioxide saturation as described above, wherein, the axial displacement is surveyed Measuring device includes a LVDT sensors, a probe and a right side disk, and the LVDT sensors are embedded at the outer of the right-hand member set On end face, the right side disk is socketed on the outer end of the right plug, and then the right side is fixed in grafting vertically to the probe On disk, its one end is inserted in the LVDT sensors.

Rock parameter assay method under supercritical carbon dioxide saturation as described above, wherein, the two of the right-hand member set End and the lateral surface of the right plug are mutually closely connected, a ring cavity are formed between the two, the lateral surface of the right plug is formed with one The piston ring that the inwall covered with the right-hand member is in contact, a left chamber and a right chamber room, the right side are divided into by the ring cavity End set lateral surface be connected with the inner wall sealing of the grip sleeve, offered on its side wall be connected with the right chamber room add Orifice.

Rock parameter assay method under supercritical carbon dioxide saturation as described above, wherein, it is interior that the right-hand member covers End port is formed with a ring portion mutually closely connected with the lateral surface of the right plug, and its outer end port passes through an inscribed right-hand member plug and institute State right plug mutually closely connected.

Rock parameter assay method under supercritical carbon dioxide saturation as described above, wherein, pass through the filler port The fluid injection into the right chamber room, the piston ring drives the right plug to be moved to the left chamber in the presence of hydraulic coupling, So that the right plug moves to the test specimen and compresses the test specimen.

Rock parameter assay method under supercritical carbon dioxide saturation as described above, wherein, the left plug plus Note passage, the filling passage of the right plug, the liquid injection hole and the filler port are separately installed with a pipeline conversion head, each institute State and be plugged with a fluid injection pipeline at pipeline adapter respectively.

Rock parameter assay method under supercritical carbon dioxide saturation as described above, wherein, the porous backing plate is One plectane, it is provided with a centre bore, and is circumferentially equipped with multiple axis holes, wherein, on the outer face of the porous backing plate, respectively It is connected respectively by a conduit between the axis hole and the centre bore, between each adjacent axis hole.

Rock parameter assay method under supercritical carbon dioxide saturation as described above, wherein, in the grip sleeve Heating mantle and temperature sensor are provided with, the heating mantle is located at the ring cavity, the temperature sensor is positioned over described add In hot jacket.

Rock parameter assay method under supercritical carbon dioxide saturation as described above, wherein, the left end set and institute State right-hand member set respectively by external screw thread with the grip sleeve to be connected, the left plug covers phase by external screw thread with the left end Connection, wherein, the lateral surface of the left end set and right-hand member set, which is respectively formed with annular groove, the annular groove, is embedded with sealing Part.Rock parameter assay method under the supercritical carbon dioxide saturation of the present invention, can apply axle pressure and confined pressure, mould to test specimen Intend the high-stress state of formation rock, abundant simulated formation rock high temperature, high pressure, containing environmental qualities such as pore pressures so that Experimental result more conforms to actual conditions under supercritical carbon dioxide.

Rock parameter assay method under the supercritical carbon dioxide saturation of the present invention, simple in construction, small volume, operation side Just, can be under simulated formation high temperature, high-stress state, pressure condition containing hole, the supercritical carbon dioxide for completing rock core oozes The measure of saturating rate and mechanics parameter.

Brief description of the drawings

The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein:

Fig. 1 is the schematic appearance after present invention installation.

Fig. 2 is Fig. 1 sectional view.

Fig. 3 for right plug, right-hand member set and right-hand member plug etc. in the present invention mutual alignment schematic diagram.

Fig. 4 for the present invention in left plug, test specimen and right plug between mutual alignment relation schematic diagram.

Main element label declaration:

1 test specimen

The 2 left filling of plug 21 passages

The right plug of 3 seal rubber sleeve 4

The left chamber of 40 ring cavity 401

402 right chamber rooms 41 fill passage

The grip sleeve of 42 piston ring 5

The liquid injection hole of 501 ring cavity 502

51 left ends cover 52 right-hand member sets

The ring portion of 520 filler port 521

The fluid injection pipeline of 522 right-hand member plug 53

The axial shift measuring instrument of 54 annular groove 6

The probe of 61 LVDT sensors 62

The porous backing plate of 63 right side disk 7

The axis hole of 71 centre bore 72

73 conduits

Embodiment

The present invention proposes the rock parameter assay method under a kind of supercritical carbon dioxide saturation, and it is applied to a clamping dress Put, the clamping device include a left plug, a seal rubber sleeve, a left plug and a grip sleeve, the left plug and The rock parameter assay method under a filling passage, the supercritical carbon dioxide saturation is formed with right plug respectively in axial direction Following steps:A) rock material is processed into the test specimen of preliminary dimension, is positioned in the seal rubber sleeve, the seal rubber sleeve Two ends are sheathed on the left plug and right plug, set a porous backing plate respectively at the two ends of the test specimen, porous described in two Backing plate correspondence and the end of the left plug and right plug fit;B) grip sleeve is sheathed on the left plug, institute State on seal rubber sleeve and the right plug, its two ends correspondence covers mutually close with the left plug, right plug by left end set and right-hand member Connect, it forms a ring cavity between the seal rubber sleeve, the right plug can cover relative to the right-hand member to be moved;C) clamping is passed through The liquid injection hole opened up on sleeve side walls fills hydraulic oil into the ring cavity, and oil temperature is maintained into the temperature value of setting, makes liquid Press oil the confined pressure value that setting is in the confined pressure that test specimen applies;D) axial compressive force is applied to the right plug, makes the right plug The test specimen is compressed, until the axial compressive force reaches setting value;E) respectively into the filling passage of the left plug and right plug Filling passage with first pressure inject supercritical carbon dioxide fluid, when the supercritical carbon dioxide in the test specimen reach it is full With it is rear, by the injection boost in pressure of the left closure to second pressure, record stream of supercritical carbon dioxide amount;F) off-test Afterwards, it is exhausted by the filling passage on left plug, and by the liquid injection hole discharge opeing of the grip sleeve, removes the test specimen Confined pressure and axle pressure, according to the supercritical carbon dioxide fluid volume entered in the test specimen, the overcritical dioxy of calculation testing piece Change carbon permeability, complete experiment.

The present invention also proposes the rock parameter assay method under a kind of supercritical carbon dioxide saturation, and it is applied to a clamping On device, the clamping device includes a left plug, a seal rubber sleeve, a left plug and a grip sleeve, the left plug And the rock parameter measure side under a filling passage, the supercritical carbon dioxide saturation is formed with right plug respectively in axial direction Method following steps:A) rock material is processed into the test specimen of preliminary dimension, is positioned in the seal rubber sleeve, the seal rubber sleeve Two ends be sheathed on the left plug and right plug, a porous backing plate is set respectively at the two ends of the test specimen, it is many described in two Hole backing plate correspondence and the end of the left plug and right plug fit;B) by the grip sleeve be sheathed on the left plug, On the seal rubber sleeve and the right plug, its two ends correspondence is stifled by left end set and right-hand member set and the left plug, the right side Head mutually touches, and it forms a ring cavity between the seal rubber sleeve, and the right plug can cover relative to the right-hand member to be moved;C) by institute State the liquid injection hole opened up on the wall of grip sleeve side and hydraulic oil is filled into the ring cavity, and oil temperature is maintained to the temperature of setting Value, makes the confined pressure that hydraulic oil applies to the test specimen be in predetermined confined pressure;D) axial compressive force is applied to the right plug, made described Right plug compresses the test specimen, afterwards, is injected respectively into the filling passage of the left plug, the filling passage of the right plug Supercritical carbon dioxide fluid, makes the CO 2 fluid enter in the test specimen, until the pore pressure in the test specimen Reach saturation;E) axial compressive force, effect of the test specimen in axial compressive force are applied to the test specimen by the mobile right-hand member set Under deform, the axial shift measuring instrument set between the right plug is covered by the right-hand member, measures described right stifled First 4 displacement, then obtains the decrement of the test specimen, wherein, in test process, record the axial pressure value of each loading Axial compression amount corresponding with the test specimen;F) according to loading axial compressive force and the record data of test specimen axial compression amount, calculate Go out modulus of elasticity and triaxial shear strength of the test specimen under supercritical carbon dioxide saturation conditions.

Rock parameter assay method under the supercritical carbon dioxide saturation of the present invention, can be in simulated formation high temperature, height Under stress state and pressure condition containing hole, the correlative study of rock parameter under supercritical carbon dioxide is realized, subsequently should be With creating conditions.

Therefore, in order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, below in conjunction with accompanying drawing and Preferred embodiment, to the specific embodiment party of the rock parameter assay method under supercritical carbon dioxide saturation proposed by the present invention Formula, structure, feature and effect, are described in detail as after.In addition, by the explanation of embodiment, when can be to the present invention up to The technological means and effect taken into predetermined purpose are able to more deeply specific understanding, but institute's accompanying drawing is only to provide reference Used with explanation, not for being any limitation as to the present invention.Wherein, identical part uses identical label

Fig. 1 is the schematic appearance after present invention installation.Fig. 2 is Fig. 1 sectional view.Fig. 3 is right plug, the right side in the present invention The mutual alignment schematic diagram of end set and right-hand member plug etc..Fig. 4 is mutual between left plug, test specimen and the right plug in the present invention The schematic diagram of position relationship.

Embodiment one

As shown in Figure 1, Figure 2 and shown in Fig. 4, the rock parameter measure side under supercritical carbon dioxide saturation proposed by the present invention Method, it is applied on a clamping device, the supercritical carbon dioxide permeability of rock sample can be tested.The clamping dress Put including a left plug 2, a seal rubber sleeve 3, a left grip sleeve 5 of plug 4 and one, on the left plug 2 and right plug 4 point It has not been axially formed below the rock parameter assay method under a filling passage 21,41, the supercritical carbon dioxide saturation Step:

A) rock material is processed into the test specimen (rock core) 1 of preliminary dimension, is positioned in the seal rubber sleeve 3, it is described close The two ends of sealing set 3 are sheathed on the left plug 2 and right plug 4, and a porous backing plate is set respectively at the two ends of the test specimen 1 7, the porous correspondence of backing plate 7 described in two and the end of the left plug 2 and right plug 4 fit;

B) grip sleeve 5 is sheathed on the left plug 2, the seal rubber sleeve 3 and the right plug 4, it two End correspondence is covered by left end set 51 and right-hand member 52 mutually touches with the left plug 2, right plug 4, itself and described 3 shapes of seal rubber sleeve Into a ring cavity 501, the right plug 4 can be moved relative to right-hand member set 52;

C) hydraulic oil is filled into the ring cavity 501 by the liquid injection hole 502 opened up on the side wall of grip sleeve 5, and Oil temperature is maintained to the temperature value of setting, the confined pressure for making hydraulic oil apply the test specimen 1 is in the confined pressure value of setting, wherein, It is preferred that the temperature of hydraulic oil is more than 31.10 DEG C, such as it is 35 DEG C;

D) axial compressive force (axle pressure) is applied to the test specimen 1 by the right plug 4, until the axial compressive force reaches setting Value;

E) respectively into the filling passage of the left plug 2 and right plug 4 with first pressure (such as P1=7.38MPa) note Enter supercritical carbon dioxide fluid, after the supercritical carbon dioxide in the test specimen 1 reaches saturation, by the note of the left closure Enter boost in pressure to second pressure (such as P2=10MPa), stream of supercritical carbon dioxide amount Q is recorded, wherein, in actual experiment When, can be by setting cmf record to enter the CO 2 fluid volume of test specimen on pipeline;

F) after off-test, it is exhausted by the filling passage 21 on left plug 2, and passes through the grip sleeve 5 The discharge opeing of liquid injection hole 502, removes the confined pressure and axle pressure of the test specimen 1, according to the stream of supercritical carbon dioxide entered in the test specimen 1 Body volume and test specimen volume, the supercritical carbon dioxide permeability of calculation testing piece complete experiment.

Specifically, above-mentioned data are passed through into following known computing permeability formula manipulation:

K=2000*P2*QuL/A(P2 2-P2 1), wherein:K-permeability, 10-3μm2;P1、P2Pressure at-test specimen two ends Value, MPa;L-piece lengths, mm;A-test specimen cross-sectional area, mm2;U-supercritical carbon dioxide viscosity, mpas;Q-stream Speed, cm3/s。

In above-mentioned experiment, if supercritical carbon dioxide saturation pressure is 7.38MPa, fluid is penetrated in test specimen 1 Pressure should be greater than 7.38MPa, and due to being sealed between seal rubber sleeve and left end set, right-hand member set by compressing, therefore confined pressure value should be long-range In 7.38MPa;Test specimen axle pressure is defined without determining to require by compressing test specimen, because test specimen axle presses the stress difference between confined pressure When larger, test specimen can be caused to produce certain damage, therefore axle pressure should not differ too big with the numerical value between confined pressure.Wherein, in tool When body is applied, the carbon dioxide of outflow can be cooled to liquid, be then pressurized to 7.5MPa, then be heated to 35 DEG C, Supercriticality will be presented in carbon dioxide now.

Embodiment two

Rock parameter assay method under supercritical carbon dioxide saturation proposed by the present invention, can be in supercritical carbon dioxide The modulus of elasticity and triaxial shear strength of experimental rock material under saturation conditions.Identical with embodiment one, the present invention is applied to On one clamping device, for ease of narration, identical part employs identical title herein.It is left stifled that the clamping device includes one Formed respectively in axial direction on first 2, one seal rubber sleeve 3, a left grip sleeve 5 of plug 4 and one, the left plug 2 and right plug 4 There are the rock parameter assay method following steps under a filling passage 21,41, the supercritical carbon dioxide saturation:

A) rock material is processed into the test specimen (rock core) 1 of preliminary dimension, is positioned in the seal rubber sleeve 3, it is described close The two ends of sealing set 3 are sheathed on the left plug 2 and right plug 4, and a porous backing plate is set respectively at the two ends of the test specimen 1 7, the porous correspondence of backing plate 7 described in two and the end of the left plug 2 and right plug 4 fit;

B) grip sleeve 3 is sheathed on the left plug 2, the seal rubber sleeve 3 and the right plug 4, it two End correspondence is covered by left end set 51 and right-hand member 52 mutually touches with the left plug 2, the right plug 4, itself and the seal rubber sleeve Between form a ring cavity, the right plug can cover relative to the right-hand member to be moved;

C) liquid injection hole 502 opened up by the side wall of grip sleeve 5 fills hydraulic oil into the ring cavity 501, and Oil temperature is maintained to the temperature value of setting, the confined pressure that hydraulic oil applies to the test specimen 1 is in predetermined confined pressure;

D) axial compressive force (axle pressure) is applied to the right plug 4, the right plug 4 is compressed the test specimen 1, afterwards, point Not supercritical carbon dioxide fluid is injected into the filling passage 21, the filling passage 41 of the right plug 4 of the left plug 2, The CO 2 fluid is set to enter in the test specimen 1, until the pore pressure in the test specimen 1 reaches saturation, wherein, in reality , can be by installing the modes such as pressure sensor at filling passage, seal rubber sleeve or test specimen, to judge test specimen hole when border is tested Pressure whether saturation, i.e., when CO 2 fluid pressure stability does not change, the pore pressure at the test specimen is to reach Set pressure;

E) 52 pairs of test specimens 1 are covered by the mobile right-hand member and applies axial compressive force, work of the test specimen 1 in axial compressive force Deformed under, the axial shift measuring instrument set between 52 and the right plug 4 is covered by the right-hand member, measurement is described The displacement of right plug 4, then obtains the decrement of the test specimen, wherein, in test process, record each loading axial compressive force Numerical value axial compression amount corresponding with the test specimen,;

F) according to loading axial compressive force and the record data of test specimen axial compression amount, using corresponding formula, institute is calculated State modulus of elasticity and triaxial shear strength of the test specimen 1 under supercritical carbon dioxide saturation conditions.

Specifically, above-mentioned data are handled by following modulus of elasticity and compression strength calculation formula:

σu=Pmax/ A, wherein:σu- triaxial shear strength, MPa;Pmax- axial direction maximum load, N;A-initial test specimen is horizontal Sectional area, mm2

E=Δs σ50%/Δξ1, wherein:E-modulus of elasticity, MPa;Δσ50%- axial stress is poor;Δξ1- axial strain Difference, dimensionless.

Wherein, after gathered data terminates, after off-test, the filling passage 21,41 on left plug 2 and right plug 4 is passed through It is exhausted, and by the discharge opeing of liquid injection hole 520 of the grip sleeve 52, to remove the confined pressure and axle pressure of the test specimen 1, completes Experiment.

As shown in figure 3, the axial shift measuring instrument 6 includes a LVDT sensors 61, a probe 62 and a right side Disk 63, the LVDT sensors 61 are embedded on the outer face of the right-hand member set 52, and the right side disk 63 is socketed on described right stifled On first 4 outer end, the probe 62 then be fixed on the right side disk 63 by grafting vertically, and its one end inserts the LVDT sensings In device 61.Wherein, (the English full name Linear Variable Differential of LVDT sensors 61 Transformer it is) linear variable difference transformer abbreviation, belongs to linear displacement transducer, when in use plug in the probe Enter in its measured hole, as composition structure and working principle of the LVDT sensors 61 etc., due to being prior art, This is repeated no more.

In real work, when the right plug 4 is moved relative to right-hand member set 12, the related institute of right side disk 63 State probe 62 to move in the lump, and the LVDT sensors 61 are by detecting shift length of the probe 62 inside it, can be with The displacement of the right plug 4 is obtained, and then draws the decrement of test specimen 1.

In the respective embodiments described above, the two ends of the right-hand member set 52 and the lateral surface of the right plug 4 are mutually closely connected, both Between be formed with a ring cavity 40, the lateral surface of the right plug 4 is formed with the work that an inwall for covering 52 with the right-hand member is in contact Plug ring 42, a left chamber 401 and a right chamber room 402, the lateral surface of the right-hand member set 52 and institute are divided into by the ring cavity 40 State and offer the filler port 520 being connected with the right chamber room 402 on the inner wall sealing connection of grip sleeve 5, its side wall.In reality In testing, by covering 52 fluid injection of filler port 520 to the right-hand member, 4 pairs of the right plug test specimen 1 is set to apply axial compressive force, The test specimen 1 deforms in the presence of axial compressive force, and measures the right plug 4 by above-mentioned axial shift measuring instrument Displacement, then obtain the decrement of the test specimen.Wherein, in specific experiment, flow velocity that can be certain is to the filling Fluid injection in hole 520, makes right plug 4 be loaded with 0.01mm/min loading velocity to test specimen, is easy to follow-up calculating.

Wherein, the inner port of the right-hand member set 52 is formed with a ring portion mutually closely connected with the lateral surface of the right plug 4 521, its outer end port is mutually closely connected by an inscribed right-hand member plug 522 and the right plug 4.

It is preferred that also passage 21, the filling passage 41 of the right plug 4, the fluid injection can be filled in the left plug 2 Hole 502 and the filler port 520 are separately installed with a pipeline conversion head, each pipeline adapter and are plugged with a fluid injection respectively Pipeline 53.

In addition, operationally, pressure sensor monitoring can be also set at the ring cavity 501, the liquid injection hole 502 in advance Pressure sensor monitoring is set to surpass at confined pressure, the filling passage 21, the filling passage 41 of the right plug 4 in the left plug 2 Critical carbon dioxide pressure, in order to subsequent job.

Thus, by the filler port 520 fluid injection into the right chamber room 402, the piston in the presence of hydraulic coupling Ring 42 drives the right plug 4 to be moved to the left chamber 401, so that the right plug 4 compresses the test specimen 1, until examination Axial compressive force on part reaches setting value.As for specific numerical value, can as needed depending on, such as in above-mentioned embodiment two In, the pretightning force of right 4 pairs of test specimens of plug can be set to 0.1KN.

In the respective embodiments described above, as illustrated, it is preferred that filling passage 21, the right plug 4 of the left plug 2 Filling passage 41, the liquid injection hole 502 and the filler port 520 are separately installed with a pipeline conversion head, each pipeline switching A fluid injection pipeline 53 is plugged with respectively at head.

In the respective embodiments described above, the porous backing plate 7 is a plectane, and it is provided with a centre bore 71, and circumferentially ring Provided with multiple axis holes 72, wherein, on the outer face of the porous backing plate 7, between each axis hole 72 and the centre bore 71, It is connected respectively by a conduit 73 between each adjacent axis hole 72, for shunting the fluid into for the centre bore 71 will to be flowed into On axis hole, fluid is set fully to be contacted with test specimen.

In the respective embodiments described above, heating mantle (not shown) and temperature are provided with preferably described grip sleeve 5 Sensor (not shown), the heating mantle is located at the ring cavity 501, and the temperature sensor is positioned over the heating mantle It is interior, be conducive to the insulation to hydraulic oil in the grip sleeve 5.Pass through liquid injection hole 502 to the ring cavity in practical application, working as Injected in 501 after hydraulic oil, the temperature of hydraulic oil can be monitored in real time by the temperature sensor, and by heating mantle to liquid Force feed is heated, and hydraulic oil is in suitable temperature, is able to maintain that stabilization., can be by the heating mantle in specific install It is installed in the grip sleeve 5, and the temperature sensor is arranged in the heating mantle, makes heating process more equal Even, monitoring temperature is more accurate, meanwhile, directly can be worn on the side wall of the grip sleeve 5 wire respectively with TEMP Device and heating mantle connection, and be connected in corresponding monitoring device, it is easy to use.

In the respective embodiments described above, in order that each part closely coupled can connect, the preferential left end set 51 and the right side End set 52 is connected by external screw thread with the grip sleeve 5 respectively, and the left plug 2 passes through external screw thread and left end set 51 It is connected, in specific assembling, after the left plug 2 and the socket of seal rubber sleeve 3, the left end set 51 can be threaded directly into It is interior, it is easy for installation;

Wherein, the lateral surface of the left end set 51 and right-hand member set 52 is respectively formed with annular groove 54, the annular groove 54 Seal (not indicated in figure) is embedded with, to improve the sealing property of each part joint.

In an experiment, it is cylindrical rock (rock core) that the test specimen 1, which may be selected, and its a diameter of 38mm, length are the 2 of diameter ~2.5 times;Can be easy to use by plunger pump to liquid injection hole 502 and the fluid injection of filler port 520.

In an experiment, wherein, in actual use, the seal rubber sleeve, seal are preferred to use using the burn into of resistance to strong acid Resistant to elevated temperatures material is made, such as polytetrafluoroethylene (PTFE).

Rock parameter assay method under the supercritical carbon dioxide saturation of the present invention, can apply axle pressure with enclosing to test specimen Pressure, simulates the high-stress state of formation rock, abundant simulated formation rock high temperature, high pressure, containing environmental qualities such as pore pressures, So that experimental result more conforms to actual conditions under supercritical carbon dioxide.

Rock parameter assay method under the supercritical carbon dioxide saturation of the present invention, simple in construction, small volume, operation side Just, can be under simulated formation high temperature, high-stress state, pressure condition containing hole, the supercritical carbon dioxide for completing rock core oozes The measure of saturating rate and mechanics parameter.

Schematical embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.It is any Those skilled in the art, the equivalent variations made on the premise of the design of the present invention and principle is not departed from and modification, all should Belong to the scope of protection of the invention.

Claims (10)

1. the rock parameter assay method under a kind of supercritical carbon dioxide saturation, it is applied on a clamping device, the folder Holding device is included on a left plug, a seal rubber sleeve, a left plug and a grip sleeve, the left plug and right plug respectively It has been axially formed the rock parameter assay method following steps under a filling passage, the supercritical carbon dioxide saturation:
A) rock material is processed into the test specimen of preliminary dimension, is positioned in the seal rubber sleeve, the two ends of the seal rubber sleeve It is sheathed on the left plug and right plug, a porous backing plate is set respectively at the two ends of the test specimen, porous backing plate described in two Correspondence and the end of the left plug and right plug fit;
B) grip sleeve is sheathed on the left plug, the seal rubber sleeve and the right plug, its two ends correspondence is logical Cross left end set and right-hand member set mutually touches with the left plug, right plug, it forms a ring cavity, the right side between the seal rubber sleeve Plug can cover relative to the right-hand member to be moved;
C) hydraulic oil is filled into the ring cavity by the liquid injection hole opened up on the wall of the grip sleeve side, and oil temperature is maintained The temperature value of setting, the confined pressure for making hydraulic oil apply test specimen is in the confined pressure value of setting;
D) axial compressive force is applied to the right plug, the right plug is compressed the test specimen, until the axial compressive force reaches and set Definite value;
E) filling passage respectively into the filling passage of the left plug and right plug injects overcritical dioxy with first pressure Change carbon flow body, after the supercritical carbon dioxide in the test specimen reaches saturation, by the injection boost in pressure of the left closure extremely Second pressure, records stream of supercritical carbon dioxide amount;
F) after off-test, it is exhausted, and is arranged by the liquid injection hole of the grip sleeve by the filling passage on left plug Liquid, removes the confined pressure and axle pressure of the test specimen, according to the supercritical carbon dioxide fluid volume entered in the test specimen, calculates examination The supercritical carbon dioxide permeability of part, completes experiment.
2. the rock parameter assay method under a kind of supercritical carbon dioxide saturation, it is applied on a clamping device, the folder Holding device is included on a left plug, a seal rubber sleeve, a left plug and a grip sleeve, the left plug and right plug respectively It has been axially formed the rock parameter assay method following steps under a filling passage, the supercritical carbon dioxide saturation:
A) rock material is processed into the test specimen of preliminary dimension, is positioned in the seal rubber sleeve, the two ends of the seal rubber sleeve It is sheathed on the left plug and right plug, a porous backing plate is set respectively at the two ends of the test specimen, porous backing plate described in two Correspondence and the end of the left plug and right plug fit;
B) grip sleeve is sheathed on the left plug, the seal rubber sleeve and the right plug, its two ends correspondence is logical Cross left end set and right-hand member set mutually touches with the left plug, the right plug, it forms a ring cavity, institute between the seal rubber sleeve Movement can be covered relative to the right-hand member by stating right plug;
C) hydraulic oil is filled into the ring cavity by the liquid injection hole opened up on the wall of the grip sleeve side, and oil temperature is maintained The temperature value of setting, makes the confined pressure that hydraulic oil applies to the test specimen be in predetermined confined pressure;
D) axial compressive force is applied to the right plug, the right plug is compressed the test specimen, afterwards, respectively to the left plug Filling passage, the right plug filling passage in injection supercritical carbon dioxide fluid, enter the CO 2 fluid Enter in the test specimen, until the pore pressure in the test specimen reaches saturation;
E) axial compressive force is applied to the test specimen by the mobile right-hand member set, the test specimen occurs in the presence of axial compressive force Deformation, the axial shift measuring instrument set between the right plug is covered by the right-hand member, measures the position of the right plug 4 Shifting amount, then obtains the decrement of the test specimen, wherein, in test process, record each axial pressure value of loading with it is described The corresponding axial compression amount of test specimen;
F) according to loading axial compressive force and the record data of test specimen axial compression amount, the test specimen is calculated in overcritical titanium dioxide Modulus of elasticity and triaxial shear strength under carbon saturation conditions.
3. the rock parameter assay method under supercritical carbon dioxide saturation as claimed in claim 2, it is characterised in that described Axial shift measuring instrument includes a LVDT sensors, a probe and a right side disk, and the LVDT sensors are embedded at described On the outer face of right-hand member set, the right side disk is socketed on the outer end of the right plug, and the probe then fix vertically by grafting In on the right side disk, its one end is inserted in the LVDT sensors.
4. the rock parameter assay method under supercritical carbon dioxide saturation as claimed in claim 1 or 2, it is characterised in that The two ends of the right-hand member set and the lateral surface of the right plug are mutually closely connected, and a ring cavity is formed between the two, the right plug Lateral surface is formed with the piston ring that an inwall covered with the right-hand member is in contact, and the ring cavity is divided into a left chamber and one Right chamber room, the lateral surface of the right-hand member set is connected with the inner wall sealing of the grip sleeve, is offered on its side wall and the right side The filler port that chamber is connected.
5. the rock parameter assay method under supercritical carbon dioxide saturation as claimed in claim 4, it is characterised in that described The inner port of right-hand member set is formed with a ring portion mutually closely connected with the lateral surface of the right plug, and its outer end port is by being inscribed one Right-hand member plug and the right plug are mutually closely connected.
6. the rock parameter assay method under supercritical carbon dioxide saturation as claimed in claim 5, it is characterised in that pass through Filler port fluid injection into the right chamber room, the piston ring drives the right plug to the left side in the presence of hydraulic coupling Chamber is moved, so that the right plug moves to the test specimen and compresses the test specimen.
7. the rock parameter assay method under supercritical carbon dioxide saturation as claimed in claim 1 or 2, it is characterised in that Filling passage, the filling passage of the right plug, the liquid injection hole and the filler port of the left plug are separately installed with one A fluid injection pipeline is plugged with respectively at pipeline conversion head, each pipeline adapter.
8. the rock parameter assay method under supercritical carbon dioxide saturation as claimed in claim 1 or 2, it is characterised in that The porous backing plate is a plectane, and it is provided with a centre bore, and is circumferentially equipped with multiple axis holes, wherein, in the porous pad On the outer face of plate, it is connected respectively by a conduit between each axis hole and the centre bore, between each adjacent axis hole It is logical.
9. the rock parameter assay method under supercritical carbon dioxide saturation as claimed in claim 1 or 2, it is characterised in that Heating mantle and temperature sensor are provided with the grip sleeve, the heating mantle is located at the ring cavity, the TEMP Device is positioned in the heating mantle.
10. the rock parameter assay method under supercritical carbon dioxide saturation as claimed in claim 1 or 2, it is characterised in that The left end set and right-hand member set are connected by external screw thread with the grip sleeve respectively, and the left plug passes through external screw thread It is connected with the left end set, wherein, the lateral surface of the left end set and right-hand member set is respectively formed with annular groove, the annular groove Inside it is embedded with seal.
CN201710589332.1A 2017-07-19 2017-07-19 A kind of rock parameter assay method under supercritical carbon dioxide saturation CN107271349A (en)

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