CN104198243A - Preparation method of artificial core for simulating hydrate stratum skeleton in frozen soil area - Google Patents
Preparation method of artificial core for simulating hydrate stratum skeleton in frozen soil area Download PDFInfo
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- CN104198243A CN104198243A CN201410437699.8A CN201410437699A CN104198243A CN 104198243 A CN104198243 A CN 104198243A CN 201410437699 A CN201410437699 A CN 201410437699A CN 104198243 A CN104198243 A CN 104198243A
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- permafrost region
- hydrate formation
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- 238000002360 preparation method Methods 0.000 title claims abstract description 47
- 239000002689 soil Substances 0.000 title abstract description 4
- 239000011435 rock Substances 0.000 claims abstract description 109
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 67
- 239000004576 sand Substances 0.000 claims abstract description 67
- 230000035699 permeability Effects 0.000 claims abstract description 35
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 238000000748 compression moulding Methods 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 40
- 238000004088 simulation Methods 0.000 claims description 29
- 238000002474 experimental method Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 18
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000005457 optimization Methods 0.000 claims description 10
- 239000003822 epoxy resin Substances 0.000 claims description 9
- 229920000647 polyepoxide Polymers 0.000 claims description 9
- 239000004952 Polyamide Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 7
- 229920002647 polyamide Polymers 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 5
- 229940080314 sodium bentonite Drugs 0.000 claims description 5
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 5
- 230000008014 freezing Effects 0.000 claims description 4
- 238000007710 freezing Methods 0.000 claims description 4
- 238000009472 formulation Methods 0.000 claims description 3
- 230000000704 physical effect Effects 0.000 abstract description 19
- 238000009826 distribution Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 abstract description 11
- 239000011148 porous material Substances 0.000 abstract description 7
- 239000002245 particle Substances 0.000 abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 58
- 238000000034 method Methods 0.000 description 14
- 235000013339 cereals Nutrition 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 6
- 239000004927 clay Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000013459 approach Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 229910052753 mercury Inorganic materials 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 102000003712 Complement factor B Human genes 0.000 description 2
- 108090000056 Complement factor B Proteins 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000012749 thinning agent Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000004682 monohydrates Chemical class 0.000 description 1
- 150000002924 oxiranes Chemical class 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of an artificial core for simulating a hydrate stratum skeleton in a frozen soil area, which comprises the following steps: s1, acquiring the components, the grain composition, the density, the porosity and the permeability of the stratum to be simulated; s2, determining the proportion range of the base sand and the regulator according to the components of the simulated formation, and determining the particle composition of the base sand according to the particle composition; s3, setting the size of a core, and determining the dosage of the base sand and the regulator according to the set core size and the density of the stratum to be simulated; s4, taking the porosity and the permeability as target values, setting the influence factors and the level values of the target values, and designing an orthogonal test formula table; and S5, pressing the rock core in a compression molding mode according to the orthogonal test formula table. The basic physical property parameters of the core manufactured by the core manufacturing method are close to the natural gas hydrate stratum of a real frozen soil area, the pore distribution is closer to the normal distribution characteristic of the real stratum, and batch manufacturing comparison and repeated tests are facilitated.
Description
Technical field
The present invention relates to unconventional energy resource gas hydrate reservoir simulation experimental technique, particularly a kind of synthetic core preparation method who simulates permafrost region hydrate formation skeleton.
Background technology
Along with day by day consuming and the rapid growth of the mankind to energy demand of world's conventional energy resources reserves, find the new alternative energy extremely urgent.Wherein gas hydrate, as a kind of new and effective energy, have become the focus of global energy and Environmental Studies, are described as the strategic resource that 21 century has business development prospect.
Due to described gas hydrate world's frozen soil and the ocean area that extensively distributes, exploitation difficulty is large, so production technique requires high.And while studying for the exploration of hydrate formation and production technique, conventionally need first, to hydrate formation sampling, to obtain stratum related property parameter, and then to carry out fine evaluation to reservoir.Yet the severe tax Tibetan environment in addition hydrate of harshness is stablized Temperature-pressure Conditions, make obtaining of natural gas hydrate rock core abnormal difficult and with high costs, therefore, when research hydrate formation physical property characteristic, conventionally in experiment, use synthetic core to substitute natural gas hydrate rock core and carry out simulation test research.
At present both at home and abroad in hydrate simulation experiment study, generally by adopting the materials such as silica sand, silica gel, glass, activated charcoal to be simply filled in reactor then compacting, make rock core.Owing to generally not considering to comprise with hydrate formation basic physical properties parameter in described manufacturing process: permeability, factor of porosity, the isoparametric coupling of mechanical strength, therefore the rock core that the compacting of hand packing at present obtains is compared with real natural gas hydrate stratum: rock core mechanical strength is lower, easily loose, easily cause the obstruction of instrument pipeline; The basic physical properties such as core permeability, factor of porosity parameter and original position stratum difference are large and repeatable low, the carrying out that is unfavorable for contrast experiment and repeats experiment.
The hydrate of current tool business development potentiality is mainly positioned at Frozen Ground Area, therefore in the urgent need to a kind of rock core skeleton basic physical properties parameter of preparation that can make, approach the Corestone manufacture method of true permafrost region natural gas hydrate stratum, to be follow-up permafrost region hydrate business development establish a firm foundation.
Summary of the invention
The object of this invention is to provide a kind of synthetic core preparation method who simulates permafrost region hydrate formation skeleton, to obtain the basic physical properties parameter rock core approaching with the physical parameter of true natural gas hydrate stratum.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
A synthetic core preparation method who simulates permafrost region hydrate formation skeleton, comprising:
S1: obtain component, grain composition, density, the porosity and permeability of wanting simulated formation;
S2: determine the proportional range of base sand and correctives according to the component of described simulated formation, determine the grain composition of base sand according to described grain composition;
S3: set rock core size, determine the consumption of described base sand and correctives according to the density of the rock core size of described setting and described wish simulated formation;
S4: using described porosity and permeability as desired value, and the influence factor of target setting value and level value thereof, design orthogonal test formula table;
S5: according to described orthogonal test formula table, suppress rock core by the mode of compression molding.
In a preferred embodiment, also comprise by the base sand of determining consumption in S3, correctives and for the cementing agent of bond described base sand and correctives and carry out constant temperature processing, the temperature range that described constant temperature is processed is 20 degrees Celsius to 50 degrees Celsius, and the time that constant temperature is processed is at least 10 minutes.
In a preferred embodiment, also comprise:
S6: described rock core is carried out to thermostatic curing, and temperature range is 20 degrees Celsius to 50 degrees Celsius, and the time of thermostatic curing is 3 to 5 days.
In a preferred embodiment, the temperature of described constant temperature processing, thermostatic curing is 35 degrees Celsius.
In a preferred embodiment, described in S4, influence factor comprises: described cementing agent, correctives consumption, compacting rock core required pressure and pressing time.
In a preferred embodiment, the time range of described pressurization is: 20 minutes to 60 minutes; The pressure limit of described pressurization is: 5 MPa to 15 MPas.
In a preferred embodiment, the synthetic core preparation method of described simulation permafrost region hydrate formation skeleton also comprises:
S7: measure permeability, the factor of porosity of the described rock core through thermostatic curing, carry out quadrature analysis, to determine optimization formula;
S8: if optimization formula is not unique, then tests and screen by mechanical property.
In a preferred embodiment, described mechanical property experiment comprises: obtain temperature and the uniaxial compressive strength value of wanting simulated formation, the rock core of making is freezing at the described temperature of obtaining, then carry out uniaxial compressive strength experiment, obtain the uniaxial compressive strength value of rock core, again by its with described in the uniaxial compressive strength value obtained compare, to determine end formulation.
In a preferred embodiment, the mode of described compression molding is for divide the rock core sand material that packs base sand, correctives, cementing agent composition at least 2 times in rock core mould, and gradation pressurization.
In a preferred embodiment, described base sand comprises the natural siliceous sand of the different-grain diameter of choosing according to the grain composition of prime stratum; Described cementing agent is epoxy resin and polyamide; Described correctives is sodium bentonite.
The features and advantages of the invention are: the invention provides a kind of synthetic core preparation method who simulates permafrost region hydrate formation skeleton, permeability with respect to synthetic core used in existing hydrate simulated experiment, the basic physical properties such as factor of porosity and mechanical strength parameter and hydrated in-situ thing stratum differ greatly, the synthetic core preparation method of simulation permafrost region hydrate formation skeleton of the present invention is under the prerequisite of basic physical properties parameter of determining stratum, the particle diameter proportioning of reasonable selection base sand with and correctives, the ratio of cementing agent is suppressed rock core, and then come simulating hydrate stratum, by orthogonal test, carry out parameter adjustment, the basic physical properties parameter of produced rock core approaches true permafrost region natural gas hydrate stratum.Use in addition rock core that the synthetic core preparation method of simulation permafrost region hydrate formation skeleton of the present invention makes owing to being repeatedly to pressurize, there is stronger mechanical strength and add that rock core physical parameter can adjust according to orthogonal test, be conducive to that batch making contrasts and revision test, its basic physical properties parameter meets hydrate formation physical property and production technique simulation experiment study, thereby is follow-up permafrost region hydrate business development establish a firm foundation.
Accompanying drawing explanation
Fig. 1 is a kind of steps flow chart Fig. 1 that simulates the synthetic core preparation method of permafrost region hydrate formation skeleton of the present invention;
Fig. 2 is a kind of steps flow chart Fig. 2 that simulates the synthetic core preparation method of permafrost region hydrate formation skeleton of the present invention;
Fig. 3 is a kind of structural representation of synthetic core preparation facilities;
Fig. 4 is that the rock core mercury that uses a kind of synthetic core preparation method who simulates permafrost region hydrate formation skeleton of the present invention to press mercury experiment to obtain is invaded volume and rock core pore-size histogram;
Fig. 5 is used correctives, cementing agent, pressure and time that a kind of synthetic core preparation method who simulates permafrost region hydrate formation skeleton of the present invention obtains and the trend map of permeability;
Fig. 6 is used correctives, cementing agent, pressure and time that a kind of synthetic core preparation method who simulates permafrost region hydrate formation skeleton of the present invention obtains and the trend map of factor of porosity.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is elaborated, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall in the application's claims limited range the modification of the various equivalent form of values of the present invention.
The invention provides a kind of synthetic core preparation method who simulates permafrost region hydrate formation skeleton, solved the basic physical properties parameters such as permeability, factor of porosity and mechanical strength of synthetic core used in existing hydrate simulated experiment and the problem that former hydrate formation differs greatly.Refer to Fig. 1, synthetic core preparation method steps flow chart Fig. 1 of simulation permafrost region hydrate formation skeleton of the present invention comprises:
S1: obtain component, grain composition, density, the porosity and permeability of wanting simulated formation;
S2: determine the proportional range of base sand and correctives according to the component of described simulated formation, determine the grain composition of base sand according to described grain composition;
S3: set rock core size, determine the consumption of described base sand and correctives according to the density of the rock core size of described setting and described wish simulated formation;
S4: using described porosity and permeability as desired value, and the influence factor of target setting value and level value thereof, design orthogonal test formula table;
S5: according to described orthogonal test formula table, suppress rock core by the mode of compression molding.
Described in S3, set rock core and be of a size of the setting length of rock core and the diameter of rock core, to obtain the volume of rock core.According to the rock core volume setting and densitometer, calculate the consumption of base sand and the consumption of correctives.
Described in S4, influence factor comprises: described cementing agent, correctives consumption, compacting rock core required pressure and pressing time.The time range of described pressurization is: 20 minutes to 60 minutes; The pressure limit of described pressurization is: 5 MPa to 15 MPas.
In a preferred embodiment, the synthetic core preparation method of described simulation permafrost region hydrate formation skeleton also comprises base sand, correctives and the cementing agent of in S3, determining consumption is carried out to constant temperature processing, temperature range is 20 degrees Celsius to 50 degrees Celsius, and the time that constant temperature is processed is at least 10 minutes.When base sand, correctives and the cementing agent of described definite consumption are carried out to constant temperature processing, described load weighted base sand, correctives and cementing agent can be positioned in constant temperature oven.By described load weighted base sand, correctives and cementing agent are carried out after constant temperature processing, various materials are all remained in identical temperature, described constant temperature is processed and can also be heated described cementing agent in addition, with the mobility that guarantees that it is good.The design temperature scope of described constant temperature oven is 20 degrees Celsius to 50 degrees Celsius.In a preferred embodiment, the design temperature of described constant temperature oven is 35 degrees Celsius.When temperature is during lower than 20 degrees Celsius, the mobility variation of described cementing agent; When temperature is during higher than 50 degrees Celsius, described cementing agent easily decomposites a small amount of ammonia, and when temperature is 35 degrees Celsius, the mobility of described cementing agent better and not can be decomposed.More than the time that described constant temperature is processed can be set as 10 minutes (min), to guarantee that described various material all remains in identical temperature.
In a preferred embodiment, the mode of compression molding described in S5 is for divide the rock core sand material that packs base sand, correctives, cementing agent composition at least 2 times in rock core mould, and gradation pressurization.
Refer to Fig. 2, synthetic core preparation method steps flow chart Fig. 2 of simulation permafrost region hydrate formation skeleton of the present invention also comprises:
S6: the rock core of described acquisition is carried out to thermostatic curing, and temperature range is 20 degrees Celsius to 50 degrees Celsius, and the time of thermostatic curing is 3 to 5 days;
S7: measure permeability, the factor of porosity of the described rock core through thermostatic curing, carry out quadrature analysis, to determine optimization formula;
S8: if optimization formula is not unique, then tests and screen by mechanical property.
While the rock core of described acquisition being carried out to thermostatic curing in S6, described rock core can be put into constant temperature oven, carrying out constant temperature, to process the temperature that the design temperature of described constant temperature oven processes with constant temperature in S3 identical.The time of described thermostatic curing is 3 to 5 days, fully fixed with described cementing agent after guaranteeing thermostatic curing, guarantees the mechanical strength of rock core.
Permeability, the factor of porosity of in S7, measuring the described rock core through thermostatic curing, carry out quadrature analysis, to determine primary and secondary order and the trend of each factor on the impact of permeability and factor of porosity, then determines the optimization formula in this orthogonal experiment group by quadrature analysis.
If optimization formula is not unique in S8, by mechanical property, tests and screen again.Described mechanical property experiment comprises: first obtain temperature and the uniaxial compressive strength value of wanting simulated formation, the uniaxial compressive strength value of general permafrost region hydrate formation rock core under-4 degree celsius temperature is 2 MPa to 7 MPas.Then, by the rock core of making under-4 degree celsius temperature freezing 48 hours, then carry out uniaxial compressive strength experiment, uniaxial compressive strength value and permafrost region hydrate formation rock core intensity value range by the rock core that records compare definite end formulation.
Rock core prepared by the synthetic core preparation method of simulation permafrost region hydrate formation skeleton of the present invention, its permeability is along with described correctives, binder content, the pressure of compacting and the increase of time and reduce; Its factor of porosity first increases along with the increase of described correctives content, after along with the increase of described correctives content, reduce; Described factor of porosity is along with described binder content, the pressure of pressurization and the increase of time and reduce.Therefore when its permeability of rock core of described preparation and the permeability of factor of porosity and wish simulated formation and factor of porosity have difference, can be by adjusting described correctives content, binder content, the pressure of pressurization and one or more in the time, make the permeability of rock core prepared by the synthetic core preparation method by simulation permafrost region hydrate formation skeleton of the present invention and described wish simulated formation and factor of porosity approaching or equate.
Base sand in the synthetic core preparation method of described simulation permafrost region hydrate formation skeleton can be the natural siliceous sand of the different-grain diameter of choosing according to the grain composition of prime stratum; Described cementing agent can be epoxy resin and corresponding polyamide with it; Described correctives can be sodium bentonite.
Rock core prepared by the synthetic core preparation method of described simulation permafrost region hydrate formation skeleton by natural siliceous sand, epoxy resin and with it corresponding polyamide and sodium bentonite mix compacting and form, the formula of rock core carries out proportioning by weight.
Below in conjunction with concrete example, the invention will be further described.
Experiment wish is simulated certain monohydrate well well section stratum, and making diameter is 50 millimeters, and length is about the synthetic core of 600 millimeters for the simulated experiment of post-hydration thing.
The basic physical properties parameter on well section stratum is as shown in table 1, wants the basic physical properties parameter of simulated formation, comprises factor of porosity, permeability, unit millidarcy (mD); Density, gram every cubic centimetre of (g/cm of unit
3); Uniaxial compressive strength, unit MPa (MPa) and component.Component described in table 1 is volumn concentration, and its medium sand and flour sand correspondence the percent by volume of base sand, and clay correspondence the percent by volume of correctives.The density of described sand and flour sand is 2.6g/cm
3; The density of described clay is 1.4g/cm
3.
Table 1
The even mixing manufacture of natural siliceous sand of choosing different-grain diameter according to the grain composition of pre-simulated formation in test becomes base sand, to build the main skeleton of rock core.
In experiment, the corresponding base sand proportioning of choosing is as shown in table 2.
Table 2
In test, can select in addition sodium bentonite to regulate permeability, factor of porosity and the water wettability of rock core and as the main source of mineralogical composition; Cementing agent can select that epoxide number is medium, the good epoxy resin E-44 of intensity and corresponding polyamide under cryogenic conditions.In above-mentioned rock core formula, can determine according to the grain composition of prime stratum the ratio of different meshes different rows particle diameter base sand, according to the cross-sectional area of suppressed rock core and length and density, roughly calculate the amount ranges of consumption and the correctives of base sand.As can be under 40 parts of conditions of base sand, 3 to 6 parts of correctivess, 0.5 to 1.1 part of epoxy resin, 0.5 to 1.1 part of polyamide.
In test, choose correctives, binder content, pressure and pressing time four factors as the major influence factors of permeability and factor of porosity, three levels design L of each selecting factors
9(3
4) orthogonal test, its orthogonal test formula table is as shown in table 3.
Table 3
According to wish, make the size of rock core and the consumption that formula table calculates 9 every single each materials of rock core of rock core in orthogonal test.
In test, needing the rock core length of making is 600 millimeters (mm), 50 millimeters of diameters, and tentatively establishing rock core density is 2g/cm
3, by table 3, calculating required base sand is 2140 grams (g).Utilize sample sifter according to table 3 screening mixing manufacture 2140g base sand, weigh 240.75g correctives.Described load weighted base sand, correctives and cementing agent are positioned in the constant temperature oven of 35 ℃ and are incubated 10 minutes (min), to guarantee that described cementing agent has good fluidity and to make each material temperature identical.2140g base sand is roughly divided into three minutes, and portion is put into stirrer vessel, is then placed on the electronic balance after adjustment level and makes zero, and slowly pours the epoxy resin in cementing agent into, and making balance reading is 53.5g.In the described process that adds described epoxy resin, if excess, available paper dips taking-up.Then sprinkle second part of base sand and cover epoxy resin, balance makes zero, and uses the same method and pours the 53.5g polyamide in cementing agent into, then sprinkles base sand, to make cementing agent contact in the process stirring mix as far as possible.Vessel are placed on stirring machine and stir and within 5 minutes, make the even overlay film of cementing agent in base sand particle surface, and in the process that then stir on limit, limit slowly adds correctives to make to stir.
After described base sand is mixed with cementing agent, correctives, obtain rock core sand material.Next, described rock core sand material is put into synthetic core preparation facilities and suppress, to obtain preliminary rock core.
Referring to Fig. 3, is a kind of synthetic core preparation facilities structural representation.Described synthetic core preparation facilities comprises core container 1, plug 2, the first clip 3 and the second clip 4.The cylindrical tube of described core container 1 for being spliced by two halves cylindrical shell.The axial length L of described core container 1 is 900 millimeters.In one end of described core container 1, be provided with plug 2, described plug 2 is for sealing one end of described core container 1.In the periphery of described plug 2, be provided with described the first clip 3.Described the first clip 3 inwall steppeds are step clip.Described the first clip 3 is for fastening by described plug 2 and core container 1.The other end at described core container 1 is opening end, for adding rock core sand material.At described core container 1, add one end of rock core sand material to be provided with the second clip 4, for described core container 1 is fastening.Described the second clip 4 internal diameters are identical with the outer wall of described core container 1, are straight-through clip.The screw 5 of coupling is also set on the two halves cylindrical shell of described core container 1.Described screw 5 is uniformly distributed along the axially extended direction of described core container 1.
While using described synthetic core preparation facilities to suppress rock core sand material, first the inwall of the two halves cylindrical shell of described core container 1 is wiped to examination to reduce the friction force of inwall with a small amount of bentonitic clay.The two halves cylindrical shell of described core container 1 is merged, one end is installed plug 2 and is tightened with described the first clip 3 again, and the other end is tightened with described the second clip 4.When twisting clip, clip tightens up gap should be vertical with the gap of core container.Install after the clip of two ends, then by described rock core cylindrical shell 1 screw tightening.
After described synthetic core preparation facilities installs, described the second clip 4 of dismantling, erects described core container 1, described in be provided with plug 2 one end under, opening end is upper.Then to the opening end of described core container 1, inserting 1/2 of sand material, is L1 by the real rear residue degree of depth of wooden stick punching, and described L1 is about 450 millimeters.Described the second clip 3 of dismantling, taking off described plug 2 and inserting length is the rock core rod of 400 millimeters, and the core container 1 of filling in sand is lain in a horizontal plane on pressurized equipment.It is 10 MPas that setting stops force value, at the two ends of described core container 1, movable drain plug is set, and by two ends movable drain plug, advances, and described rock core sand material is carried out to axial pressure.In movable drain plug traveling process, pressure reaches gradually setting value and stops.Take off core container and pull out 400 millimeters of rock core rods, by identical method, pack remaining sand material and 100 millimeters of rock core rods into, be forced into 10 MPas and maintain pressurized state 60 minutes.By twice filler and the pressurization of two ends movable drain plug, can guarantee the homogeneity of suppressed rock core.
Taking off described core container 1 lies in a horizontal plane on worktable, after backing out screw, open two halves core container 1, with rubber Chui, rap rock core rod and then rock core is slowly released along the cylinder inboard wall of core container 2, with dull and stereotyped, accept rear level and put into the constant temperature oven maintenance of 35 ℃ and within 72 hours, make cementing agent fully fixed.By identical method, according to the formula of orthogonal test, make all the other 8 rock cores and carry out thermostatic curing.
Please refer to table 3, when the permeability that the desired value of described orthogonal test is rock core, the major influence factors of the permeability of described desired value rock core is respectively: bentonitic clay, cementing agent, pressure and time.Please refer to Fig. 5, by range analysis, obtain bentonitic clay, cementing agent, pressure and the time trend map to permeability, in figure, ordinate represents the permeability of rock core, unit is millidarcy (mD), horizontal ordinate correspondence each level of each factor, wherein factor A represents correctives, factor B represents cementing agent, factor C represents pressure, and factor D represents the time.As shown in Figure 5, permeability is along with correctives, binder content, the increase of pressure and time and reducing.
Please refer to table 3, when the factor of porosity that the desired value of described orthogonal test is rock core, the major influence factors of described desired value core porosity is respectively: correctives, cementing agent, pressure and time.Please refer to Fig. 6, by adjusted dose of range analysis, cementing agent, pressure and the time trend map on factor of porosity impact, in figure, ordinate represents the factor of porosity of rock core, horizontal ordinate correspondence each level of each factor, wherein factor A represents bentonitic clay, factor B represents cementing agent, and factor C represents pressure, and factor D represents the time.As shown in Figure 6, factor of porosity first increases along with the increase of correctives content, after along with the increase of correctives content, reduce, along with binder content, the increase of pressure and time and reducing.
Analysis by factor size variation on the trend that the affects situation of desired value, and then can be related to that adjustment formula making artificial rock core simulates the hydrate formation of various required physical parameters according to this.
The more excellent formula that desired value permeability and factor of porosity is carried out to quadrature analysis gained has two, and permeability and factor of porosity are followed successively by rock core A:688.53 millidarcy (mD), and 32.14% and rock core B:677.50 millidarcy (mD) and 31.85%.
The uniaxial compressive strength value of general permafrost region hydrate formation rock core under-4 degree celsius temperature is 2 MPa to 7 MPas, two formula A that tentatively determine and B are made to rock core under-4 degree celsius temperature freezing 48 hours, then carry out uniaxial compressive strength experiment, record rock core A and B uniaxial compressive strength is respectively 7.16MPa and 5.85MPa, thereby final definite optimization formula is rock core B: 49.95 millimeters of diameters, 63.35 millimeters of length, permeability 677.5 millidarcies (mD), factor of porosity 31.85%, uniaxial compressive strength 5.85 MPas, 2.00 grams/cc of density.
The rock core B of described acquisition is pressed to mercury experiment, for obtaining the ratio of the shared total pore size volume of hole of different size.The pore size distribution Nogata being obtained by described pressure mercury experiment as shown in Figure 4, in figure, horizontal ordinate is pore-size, unit is micron (μ m); Ordinate is that mercury is invaded volume, and unit is milliliter (ml).As shown in Figure 4: the continuous free of discontinuities of rock core pore size distribution of made, and be normal distribution.Described rock core pore size distribution situation and the natural core that is normal distribution is comparatively approaching.
To sum up, the synthetic core preparation method of simulation permafrost region hydrate formation skeleton of the present invention can simulate permafrost region hydrate formation skeleton by the definite rock core optimization formula of orthogonal test analysis, the permeability of rock core, factor of porosity and actual formation are very approaching, and mechanical strength meets experiment needs and distribution of pores is the normal distribution identical with natural core.
The invention provides a kind of synthetic core preparation method who simulates permafrost region hydrate formation skeleton, for the basic physical properties parameters such as permeability, factor of porosity and mechanical strength of synthetic core used in existing hydrate simulated experiment and hydrated in-situ thing stratum differ greatly, the synthetic core preparation method of simulation permafrost region hydrate formation skeleton of the present invention is under the prerequisite of basic physical properties parameter of determining stratum, the particle diameter proportioning of reasonable selection base sand with and the ratio of correctives, cementing agent suppress rock core, and then come simulating hydrate stratum; By orthogonal test, carry out parameter adjustment, the basic physical properties parameter of produced rock core approaches true permafrost region natural gas hydrate stratum, and distribution of pores approaches the Normal Distribution Characteristics on true stratum more.Use in addition rock core that the synthetic core preparation method of simulation permafrost region hydrate formation skeleton of the present invention makes owing to being repeatedly to pressurize, there is stronger mechanical strength and add that rock core physical parameter can adjust according to orthogonal test, be conducive to that batch making contrasts and revision test, its basic physical properties parameter meets hydrate formation physical property and production technique simulation experiment study.
The synthetic core preparation method of simulation permafrost region hydrate formation skeleton of the present invention, in manufacturing process, has adopted the mode of thermostatic curing in addition, and the mobility that increases cementing agent by rising temperature mixes rock core sand material.And existing rock core is when make, conventionally by adding the mode of thinning agent, rock core sand material is mixed.The present invention is for the synthetic core preparation method of existing simulation permafrost region hydrate formation skeleton, owing to not adding thinning agent, reduced adding of chemical reagent, made rock core electrical properties more approach true stratum, thereby be follow-up permafrost region hydrate business development establish a firm foundation.
The foregoing is only several embodiments of the present invention, although the disclosed embodiment of the present invention as above, the embodiment that described content just adopts for the ease of understanding the present invention, is not intended to limit the present invention.Any those skilled in the art; do not departing under the prerequisite of the disclosed spirit and scope of the present invention; can in the formal and details of embodiment, do any modification and variation; but scope of patent protection of the present invention, still must be as the criterion with the scope that appended claims was defined.
Claims (10)
1. a synthetic core preparation method who simulates permafrost region hydrate formation skeleton, is characterized in that, comprising:
S1: obtain component, grain composition, density, the porosity and permeability of wanting simulated formation;
S2: determine the proportional range of base sand and correctives according to the component of described simulated formation, determine the grain composition of base sand according to described grain composition;
S3: set rock core size, determine the consumption of described base sand and correctives according to the density of the rock core size of described setting and described wish simulated formation;
S4: using described porosity and permeability as desired value, and the influence factor of target setting value and level value thereof, design orthogonal test formula table;
S5: according to described orthogonal test formula table, suppress rock core by the mode of compression molding.
2. the synthetic core preparation method of simulation permafrost region hydrate formation skeleton as claimed in claim 1, it is characterized in that, also comprise by the base sand of determining consumption in S3, correctives and for the cementing agent of bond described base sand and correctives and carry out constant temperature processing, the temperature range that described constant temperature is processed is 20 degrees Celsius to 50 degrees Celsius, and the time that constant temperature is processed is at least 10 minutes.
3. the synthetic core preparation method of simulation permafrost region hydrate formation skeleton as claimed in claim 1, is characterized in that, also comprises:
S6: described rock core is carried out to thermostatic curing, and temperature range is 20 degrees Celsius to 50 degrees Celsius, and the time of thermostatic curing is 3 to 5 days.
4. the synthetic core preparation method who simulates as claimed in claim 2 or claim 3 permafrost region hydrate formation skeleton, is characterized in that: described constant temperature is processed, the temperature of thermostatic curing is 35 degrees Celsius.
5. the synthetic core preparation method of simulation permafrost region hydrate formation skeleton as claimed in claim 1, is characterized in that, described in S4, influence factor comprises: described cementing agent, correctives consumption, compacting rock core required pressure and pressing time.
6. the synthetic core preparation method of simulation permafrost region hydrate formation skeleton as claimed in claim 5, is characterized in that, the time range of described pressurization is: 20 minutes to 60 minutes; The pressure limit of described pressurization is: 5 MPa to 15 MPas.
7. the synthetic core preparation method of simulation permafrost region hydrate formation skeleton as claimed in claim 3, is characterized in that, it also comprises:
S7: measure permeability, the factor of porosity of the described rock core through thermostatic curing, carry out quadrature analysis, to determine optimization formula;
S8: if optimization formula is not unique, then tests and screen by mechanical property.
8. the synthetic core preparation method of simulation permafrost region hydrate formation skeleton as claimed in claim 7, it is characterized in that, described mechanical property experiment comprises: obtain temperature and the uniaxial compressive strength value of wanting simulated formation, the rock core of making is freezing at the described temperature of obtaining, then carry out uniaxial compressive strength experiment, obtain the uniaxial compressive strength value of rock core, then by its with described in the uniaxial compressive strength value obtained compare, to determine end formulation.
9. the synthetic core preparation method of simulation permafrost region hydrate formation skeleton as claimed in claim 1, it is characterized in that: the mode of described compression molding is for divide the rock core sand material that packs base sand, correctives, cementing agent composition at least 2 times in rock core mould, and gradation pressurization.
10. the synthetic core preparation method of simulation permafrost region hydrate formation skeleton as claimed in claim 1, is characterized in that: described base sand comprises the natural siliceous sand of the different-grain diameter of choosing according to the grain composition of prime stratum; Described cementing agent is epoxy resin and polyamide; Described correctives is sodium bentonite.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458383A (en) * | 2014-12-19 | 2015-03-25 | 西南石油大学 | Method for making artificial rock core |
| CN104692726A (en) * | 2015-02-12 | 2015-06-10 | 中国石油大学(北京) | Preparation method for synthetic core of hard brittle hydrated mud shale |
| CN106370486A (en) * | 2015-07-23 | 2017-02-01 | 中国石油化工股份有限公司 | Method for producing artificial rock core by using freezing drilling technology |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62151739A (en) * | 1985-12-26 | 1987-07-06 | Fujita Corp | Sampling method for rock to be tested |
| CN1587960A (en) * | 2004-09-13 | 2005-03-02 | 中国石油大港油田油气勘探开发技术研究中心 | Method for producing artificial sandstone for tertiary oil production in oil field |
| CN101109676A (en) * | 2006-07-21 | 2008-01-23 | 中国石油天然气集团公司 | Manufacturing method for artificial rock core containing clay |
| WO2012087902A2 (en) * | 2010-12-21 | 2012-06-28 | Schlumberger Canada Limited | Wettability and matrix imbibition analysis |
| CN103543047A (en) * | 2013-09-06 | 2014-01-29 | 中国石油大学(北京) | Preparation method for standard manual simulated rock core test piece |
-
2014
- 2014-08-29 CN CN201410437699.8A patent/CN104198243A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62151739A (en) * | 1985-12-26 | 1987-07-06 | Fujita Corp | Sampling method for rock to be tested |
| CN1587960A (en) * | 2004-09-13 | 2005-03-02 | 中国石油大港油田油气勘探开发技术研究中心 | Method for producing artificial sandstone for tertiary oil production in oil field |
| CN101109676A (en) * | 2006-07-21 | 2008-01-23 | 中国石油天然气集团公司 | Manufacturing method for artificial rock core containing clay |
| WO2012087902A2 (en) * | 2010-12-21 | 2012-06-28 | Schlumberger Canada Limited | Wettability and matrix imbibition analysis |
| CN103543047A (en) * | 2013-09-06 | 2014-01-29 | 中国石油大学(北京) | Preparation method for standard manual simulated rock core test piece |
Non-Patent Citations (1)
| Title |
|---|
| 郑明明等: "模拟冻土区水合物地层骨架的人造岩心实验研究", 《天然气地球科学》 * |
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