CN205032150U - A reaction unit for overcritical CO2 rock core damage - Google Patents
A reaction unit for overcritical CO2 rock core damage Download PDFInfo
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- CN205032150U CN205032150U CN201520595661.3U CN201520595661U CN205032150U CN 205032150 U CN205032150 U CN 205032150U CN 201520595661 U CN201520595661 U CN 201520595661U CN 205032150 U CN205032150 U CN 205032150U
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Abstract
The utility model belongs to the technical field of the rock core damage experimental facilities, a a reaction unit for overcritical CO2 rock core damage is disclosed, include: the cauldron body and lid, the cauldron body is equipped with the inner chamber, the lid is including sealed lid and fastening lid, sealed lid with the opening sealing connection of inner chamber, fastening lid with cauldron body fastening connection, the fastening lid is used for fixing sealed lid. The utility model discloses a set up in cauldron body threaded connection's fastening lid, can limit sealed lid and in the ascending slip of axle, guarantee sealed effect, setting up of jump ring can prevent that the fastening lid from taking place to rotate and breaking away from, guarantees the fastening effect of sealed lid, spacing unit can be got rid of sealed lid and take place the pivoted possibility under the effect of jump ring, the utility model discloses realized simultaneously sealing effectually to sealed lid spacing in axial and circumference, considered during the dismantlement sealing washer by CO2 infiltration expanded problem, pressor mode is supplementary in to the cavity takes out sealed lid for the accessible, it is easier to dismantle.
Description
Technical field
The utility model relates to core damage technical field of experiment equipment, and particularly one is used for supercritical CO
2the reaction unit of core damage.
Background technology
Carbon dioxide core damage belongs to reaction under high pressure, and part Experiment needs to carry out in reactor, therefore needs to seal the lid of reactor and the junction of kettle; But lid needs often to open, and therefore can not shut again.The lid of existing reactor is the structure of one, is provided with screw thread, then above screw thread, is provided with rubber ring between lid and the inwall of reactor, thus realizes sealing.Owing to being hyperbaric environment in still, CO in experimentation
2be easy to reach supercriticality, postcritical CO
2there is very strong penetrating power, CO
2penetrate in sealing ring and sealing ring can be caused to expand, lid is forced outwardly movement, and make the screw thread between lid and reactor be subject to an axial force, the frictional force between screw thread is increased further, causes Cover opening more difficult.Because sealing ring is elastic construction, during installation, likely cause lid to reversely rotate, affect the tightness be threaded, cause sealing ring thoroughly to be compressed, cause sealing effectiveness not ideal enough.
Utility model content
(1) technical problem that will solve
The technical problems to be solved in the utility model is: for the lid design solving existing carbon dioxide core damage reactor is reasonable not, sealing effectiveness is not ideal enough, causes pressure drop in still, not easily detachable problem after sealing ring expands.
(2) technical scheme
In order to solve the problems of the technologies described above, the utility model provides a kind of for supercritical CO
2the reaction unit of core damage, comprising: kettle and lid, and described kettle is provided with inner chamber; Described lid comprises seal cover and fastening cover, and the opening of described seal cover and described inner chamber is tightly connected, and described fastening cover and described kettle are fastenedly connected, and described fastening cover is used for fixing described seal cover.
Wherein, described seal cover is provided with the seal section matched with the opening of described inner chamber, and the outside of described seal section is provided with sealing ring, and described seal cover is tightly connected by the opening part of described sealing ring and described inner chamber.
Wherein, described seal cover is placed in described fastening cover.
Wherein, described fastening cover is connected with described kettle by screw thread, and described fastening cover is also connected with the locking unit rotated for limiting it.
Wherein, described locking unit is jump ring, and the middle part of described seal cover is fixedly connected with the pipeline with described inner space, and the middle part of described fastening cover is set on described pipeline; Described jump ring is connected between described fastening cover and pipeline.
Wherein, being provided with in described inner chamber can the piston of vertically movement, and described piston contacts with the inner wall sealing of described inner chamber; Described inner chamber is separated into reaction chamber and pressurizing chamber by described piston, and described reaction chamber is positioned at the top of described pressurizing chamber.
Wherein, described pressurizing chamber is connected with safety valve by pipeline, and described safety valve is used for detecting that the pressure in pressurizing chamber is opened automatically higher than during preset security force value, carries out row pressure to described pressurizing chamber.
Wherein, be provided with position-limiting unit between described seal cover and described kettle, described position-limiting unit rotates for limiting described seal cover.
Wherein, described position-limiting unit is the projection be arranged on described seal cover and the groove be arranged on described kettle.
Wherein, described projection is arranged on the top of described seal cover side.
(3) beneficial effect
Technique scheme tool has the following advantages: the utility model discloses a kind of for supercritical CO
2the reaction unit of core damage, by being arranged at the fastening cover that kettle is threaded, can limit seal cover slip in the axial direction, ensures sealing effectiveness; Arranging of jump ring can prevent fastening cover from rotating and departing from, and ensures the fastening effect of seal cover; Position-limiting unit the possibility can got rid of seal cover and rotate under the effect of jump ring is set, realize thoroughly spacing; On the whole, the utility model achieves spacing in axial and circumferential both direction of seal cover simultaneously, ensures relative motion to occur between seal cover and kettle, ensures that sealing state can not be destroyed, good sealing effect; Inner chamber is separated into two independently cavitys by piston, can pass into liquid and carry out pressure regulation in reaction chamber, pressure regulation need to add or the mass volume that discharge less, be convenient to control, use safety; The pressure medium of bottom can not be mixed into upper piston area, eliminates the interference of non-reaction medium to experiment; Arranging the pressure that can ensure in pressurizing chamber and can not exceeding default safe pressure value of safety valve, ensures use safety; Sealing ring is considered by CO during dismounting
2the problem of osmotic swelling, the mode by pressurizeing in cavity is auxiliary takes out seal cover, and it is easier to dismantle.
Accompanying drawing explanation
Fig. 1 is the structural representation that kettle described in the utility model and lid are in released state;
Fig. 2 is the structural representation that kettle described in the utility model and lid are in assembled state;
Fig. 3 is the left view of Fig. 1.
Wherein, 1, kettle; 101, safety valve; 102, piston; 103, pressure medium discrepancy valve; 104, reaction medium inlet valve; 1041, communicating pipe; 105, reaction chamber; 106, pressurizing chamber; 201, seal cover; 202, fastening cover; 203, Pressure gauge; 204, reaction medium outlet valve; 205, sealing ring; 301, joint; 302, high pressure hand-operated measuring pump.
Detailed description of the invention
Below in conjunction with drawings and Examples, detailed description of the invention of the present utility model is described in further detail.Following examples for illustration of the utility model, but are not used for limiting scope of the present utility model.
In description of the present utility model, it should be noted that, except as otherwise noted, the implication of " multiple " is two or more; Term " on ", D score, "left", "right", " interior ", " outward ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second ", " the 3rd " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the present utility model, also it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, visual concrete condition understands the concrete meaning of above-mentioned term in the utility model.
As Figure 1-3, the utility model discloses a kind of for supercritical CO
2the reaction unit of core damage, comprising: kettle 1 and lid, and described kettle 1 is provided with inner chamber; Described lid comprises seal cover 201 and fastening cover 202, and described seal cover 201 is tightly connected with the opening of described inner chamber, and described fastening cover 202 is fastenedly connected with described kettle 1, and described fastening cover 202 is for fixing described seal cover 201.
Seal cover 201 can only be fixed on kettle 1 by fastening cover 202, can prevent seal cover 201 from sliding and causing seal failure, ensures sealing effectiveness.
Concrete, described seal cover 201 is provided with the seal section matched with the opening of described inner chamber, and the outside of described seal section is provided with sealing ring 205, and described seal cover 201 is tightly connected with the opening part of described inner chamber by described sealing ring 205.
Described seal cover 201 is placed in described fastening cover 202.Described fastening cover 202 is connected with described kettle 1 by screw thread.Described fastening cover 202 is also connected with the locking unit rotated for limiting it.Described locking unit is jump ring.The middle part of described seal cover 201 is fixedly connected with the pipeline with described inner space, and the middle part of described fastening cover 202 is set on described pipeline; Described jump ring is connected between described fastening cover 202 and pipeline.
Fastening cover 202 is connected with kettle 1 by screw thread, and pipeline is fixedly connected with seal cover 201, and fastening cover 202 is set on pipeline, and fastening cover 202 can rotate around this pipeline; The fastening failure caused seal cover 201 is rotated voluntarily for preventing fastening cover 202 in use procedure, between pipeline, jump ring is provided with at fastening cover 202, one end of jump ring is connected with pipeline, and the other end is connected with fastening cover 202, can prevent fastening cover 202 relative duct size from rotating; And pipeline is fixedly connected with seal cover 201, in seal cover is pressed in, can not rotate easily; Therefore the locking to fastening cover 202 is achieved.
Can the piston 102 of vertically movement for convenience of being provided with in described inner chamber, described piston 102 contacts with the inner wall sealing of described inner chamber; Described inner chamber is separated into reaction chamber 105 and pressurizing chamber 106 by described piston 102, and described reaction chamber 105 is positioned at the top of described pressurizing chamber 106.Its two upper and lower zone isolation come by piston 102, and the pressure medium of bottom can not be mixed into piston 102 top, eliminate the interference of non-reaction medium to experiment.Reaction chamber 105 can pass into the carbon dioxide of various phase to participate in reaction, and pressurizing chamber 106 preferably adds liquid water or other liquids carry out pressure regulation to reaction chamber 105, to meet the requirement of different experiments.
Described pressurizing chamber 106 is connected with safety valve 101 by pipeline, and described safety valve 101, for detecting that the pressure in pressurizing chamber 106 is opened automatically higher than during preset security force value, carries out row pressure to described pressurizing chamber 106.During the preset security force value causing the pressure in pressurizing chamber 106 to exceed in safety valve 101 when pressurization is excessive, safety valve 101 is automatically opened just pressure medium and is discharged, ensure the handling safety of pressure process, prevent from pressurizeing excessive damage equipment or damage personnel.
In order to prevent seal cover 201 from rotating under the effect of jump ring, to realize thorough locking, between described seal cover 201 and described kettle 1, be provided with position-limiting unit, described position-limiting unit rotates for limiting described seal cover 201.
Further, described position-limiting unit is the projection be arranged on described seal cover 201 and the groove be arranged on described kettle 1.
For convenience of the installation of seal cover 201, described projection is arranged on the top of described seal cover 201 side.Namely seal cover can rotate in installation process, to be installed behind projection place, is alignd by projection, directly push with groove.
During dismounting, first the pressure in reaction chamber 105 is laid down, make it recover normal pressure or pressure-fired, then turn on fastening cover 202, remove the axial compressive force to seal cover 201, then seal cover 201 is taken off; Because sealing ring 205 is in swelling state, seal cover 201 is slowly ejected by the mode now can pressurizeed directly to reaction chamber 105 by communicating pipe 1041 or pressurize in pressurizing chamber 105; Certainly, also can take reaction chamber 105 thoroughly emptying, and the auxiliary dismounting of the mode passing into large quantity of air, because air can accelerate flowing away of carbon dioxide in sealing ring 205 after entering reaction chamber 105, the swelling state of slow depressurization circle 205, until seal cover 201 can directly take off.
As can be seen from the above embodiments, the fastening cover 202 that the utility model is threaded by being arranged at kettle 1, can limit seal cover 201 slip in the axial direction, ensures sealing effectiveness; Arranging of jump ring can prevent fastening cover 202 from rotating and departing from, and ensures the fastening effect of seal cover 201; Position-limiting unit the possibility can got rid of seal cover 201 and rotate under the effect of jump ring is set, realize thoroughly spacing; On the whole, the utility model achieves spacing in axial and circumferential both direction of seal cover 201 simultaneously, ensures relative motion to occur between seal cover 201 and kettle 1, ensures that sealing state can not be destroyed, good sealing effect; Inner chamber is separated into two independently cavitys by piston 102, can pass into liquid and carry out pressure regulation in reaction chamber 105, and pressure regulation needs the mass volume that adds or discharge less, is convenient to control, use safety; The pressure medium of bottom can not be mixed into piston 102 top, eliminates the interference of non-reaction medium to experiment; Arranging the pressure that can ensure in pressurizing chamber 106 and can not exceeding default safe pressure value of safety valve 101, ensures use safety; Only need consider the problem of sealing ring 205 during dismounting, the mode by pressurizeing in cavity is auxiliary takes out seal cover 201, and it is easier to dismantle.
Be a kind of device of the analysis three-phase carbon dioxide core damage for laboratory shown in Fig. 1-3, it comprises: kettle 1 and lid, and described kettle 1 is provided with inner chamber, and described lid is sealedly connected on the opening part of described inner chamber; Being provided with in described inner chamber can the piston 102 of vertically movement, and described piston 102 contacts with the inner wall sealing of described inner chamber;
The top of described inner chamber is connected with reaction medium export pipeline and Pressure gauge 203, and the bottom of described inner chamber is connected with pressure medium discrepancy pipeline; The sidewall of described inner chamber is connected with communicating pipe 1041, only when described piston 102 falls within the bottom of described inner chamber, described communicating pipe 1041 is communicated with the cavity region above described piston 102.
Lid, by bore seal, makes it be isolated from the outside; The utility model arranges the structure of piston 102 in inner chamber, and piston 102 can under the motive force effect of pressure medium, upward sliding voluntarily in inner chamber, and therefore, when not considering piston 102 and rock core weight, the pressure of piston 102 both sides is consistent; This structure can get rid of the interference that non-reaction medium is tested core damage, can realize the adjustment of real-time pressure, achieves safe pressure control.
Reaction medium is carbon dioxide, be heavier than air, therefore communicating pipe 1041 is arranged on the sidewall of inner chamber, only have when piston 102 falls completely, communicating pipe 1041 is just communicated with the space on piston 102 top, communicating pipe 1041 is provided with reaction medium inlet valve 104, after reaction medium inlet valve 104 passes into carbon dioxide, the air in inner chamber slowly can be expelled.
Its two upper and lower zone isolation come by piston 102, and the pressure medium of bottom can not be mixed into piston 102 top, eliminate the interference of non-reaction medium to experiment.
Reaction medium export pipeline is arranged on top, and no matter piston 102 is in where, reaction medium can be discharged; Pressure medium discrepancy pipeline is arranged on bottom, even if piston 102 is in the state fallen completely, also pressure medium can be passed into inner chamber.
Consider that material is when uniform pressure changes, Volume Changes difference between tri-state is larger, therefore select liquid as pressure medium with the reaction environment of regulation of carbon dioxide core damage, under hyperbaric environment, only need pass into a small amount of pressure medium, larger change can be there is in the experimental situation on piston 102 top, in supercharging, pressure leak process, the increase and decrease amount of pressure medium is less, convenient adjustment, pressure leak process does not have a large amount of gas and produces, safer.
Concrete, described inner chamber is separated into reaction chamber 105 and pressurizing chamber 106 by described piston 102, and described reaction chamber 105 is positioned at the top of described pressurizing chamber 106.Pass into piston 102 bottom by pressure medium, reaction medium passes into piston 102 top, and the two is mutually isolated; By changing the pressure in pressurizing chamber 106, realize the control to pressure in reaction chamber 105.
Described pressurizing chamber 106 is connected with safety valve 101 by pipeline, and described safety valve 101, for detecting that the pressure in pressurizing chamber 106 is opened automatically higher than during preset security force value, carries out row pressure to described pressurizing chamber 106.During the preset security force value causing the pressure in pressurizing chamber 106 to exceed in safety valve 101 when pressurization is excessive, safety valve 101 is automatically opened just pressure medium and is discharged, ensure the handling safety of pressure process, prevent from pressurizeing excessive damage equipment or damage personnel.
Described pressure medium discrepancy pipeline is provided with pressure medium discrepancy valve 103 and the joint 301 for connecting pressure medium providing unit; Described pressure medium providing unit is high pressure hand-operated measuring pump 302, and described high pressure hand-operated measuring pump 302 can carry out positive pressurization and reverse reduced pressure operation to described pressurizing chamber 106.If find in pressure process, pressurization is excessive, when not yet reaching preset security force value, can change the flow direction of high pressure hand-operated measuring pump 302, the pressure medium in pressurizing chamber 106 is pumped a part, realize real-time pressure regulation.When concrete operations, also can assist row pressure by the mode opening communicating pipe 1041, now communicating pipe 1041 is not communicated with reaction medium source.
Described lid is arranged on the top of described inner chamber, and described reaction medium export pipeline is through described lid.Concrete, described lid comprises seal cover 201 and fastening cover 202, and described seal cover 201 is tightly connected with the opening of described inner chamber, and described fastening cover 202 is fastenedly connected with described kettle 1, and described fastening cover 202 is for fixing described seal cover 201.
Further, described seal cover 201 is placed in described fastening cover 202, and described reaction medium export pipeline is fixedly connected with described seal cover 201, and the middle part of described fastening cover 202 is set on described reaction medium export pipeline.Described seal cover 201 is provided with the seal section matched with the opening of described inner chamber, and the outside of described seal section is provided with sealing ring 205, and described seal cover 201 is tightly connected with the opening part of described inner chamber by described sealing ring 205.Described fastening cover 202 is connected with described kettle 1 by screw thread, and described fastening cover 202 is also connected with the locking unit rotated for limiting it.Described locking unit is be arranged on the jump ring between described reaction medium export pipeline and described fastening cover 202.
Be as mentioned above the concrete structure of CO 2 high pressure reactor described in the utility model, below elder generation designing points of the present utility model is made an explanation:
(1), CO
2special nature and feature:
CO
2critical-temperature be 31.26 DEG C, critical pressure is 7.29MPa; Be easy to reach supercriticality under reservoir condition.Therefore the damage experiment of rock core must consider the CO of three-phase
2.
Gas phase CO
2density be 1.977 × 10
-3g/ cm
3; Liquid phase CO
2density be 1.8g/cm
3, be about 910 times of gas phase; Supercritical CO
2density be 0.4 ~ 0.8g/cm
3, be about 200 ~ 400 times of gas phase.Under isothermy, pressure increase causes phase-state change, and the Volume Changes caused thus is all at 200 ~ 900 times; So must be rationally to the utilization of temperature, pressure.
Regardless of reaction condition, CO in still
2all can produce a large amount of gas when leaking to atmospheric pressure, therefore safety relief is problem very important in gas high pressure reaction all the time.
(2) design of non-reaction medium interference, is got rid of:
For the reaction of pure gas, the method can passing through to vacuumize before reactions is with the interference of deaeration to experiment;
But due to CO
2shock reaction often has water to participate in, and the now reduction of vacuum can cause the rapid evaporation of water, thus cause amount of water uncertain, add CO
2time air-flow instability, can cause damage to vavuum pump.The utility model utilizes CO
2density is greater than the feature of atmospheric density, gas access, i.e. communicating pipe 1041 is arranged at kettle 1 bottom, slowly passes into CO
2time, the air in reaction chamber 105 constantly upwards can be arranged and drive; When reaction medium exit is full of CO
2time, the air thinking in reaction chamber 105 arranged drive complete.
Kettle 1 is divided into two spaces by the piston 102 formula reactor that the utility model adopts: reaction chamber 105 and pressurizing chamber 106, the medium in two spaces does not contact completely, therefore there is not pressure medium and is mixed into reaction medium thus causes the phenomenon of experiment interference to occur.
(3), the design of real-time pressure adjustment:
Gas pressure is very sensitive to temperature, and therefore in reaction, just the beginning and end reach in balance and course of reaction, and pressure oscillation happens occasionally, and after fluctuation is greater than the fluctuation range of requirement of experiment, just must give timely pressure regulation, to keep the pressure stability of reaction system; Because the injection of gases at high pressure generally can cause larger pressure oscillation, therefore directly use gas pressure control and infeasible.The utility model adopts piston 102 formula reactor, and pressure medium adopts liquid (such as water) to continue to exert pressure; External high pressure hand-operated measuring pump 302 has positive pressurization and reverse buck functionality, and by switching the duty of high pressure hand-operated measuring pump 302, the amount of liquid in adjustment pressurizing chamber 106, controls rising or the decline of pressure in reaction chamber 105, i.e. pressure regulation in real time.
(4), the design of safe pressure control:
For security consideration, necessary steady pressure release problem rapidly when must consider while pressurization that pressure in kettle 1 exceedes safe pressure.Because the compressed coefficient of gas is comparatively large, the gas flow in pressurization and pressure leak process is all larger; The compressed coefficient of liquid is less comparatively speaking, and volume change when applying or release uniform pressure is all much smaller than gas.As CO
27.6MPa, 40 DEG C, namely the compressed coefficient of above-critical state is 0.5408MPa
-1; H under the same terms
2the compressed coefficient of O is 4.5 × 10
-4mPa
-1, both differences about 1000 times; This means to reduce identical pressure, H
2this variable of O volume is about supercritical CO
21 ‰, namely use liquid H
2o carries out safe pressure and controls more quick, effective, steady.Based on above-mentioned discussion, the utility model adopts mounting safety valve 101 bottom pressurizing chamber 106 and preset security force value, the pressure of the pressure=pressurizing chamber 106 of pressure=reaction chamber 105 in still, once pressure exceedes preset security force value in kettle 1, safety valve 101 is opened and releasing liquid immediately, pressure in kettle 1 is down to rapidly under safe pressure, ensures experiment safety; Pressure medium is herein generally aqueous water.
(5), the design of sealing and unlatching fast:
Due to CO
2be easy under experimental conditions reach supercriticality, and supercritical CO
2permeability, i.e. diffusion coefficient be liquid CO
2100 times; The advantage of this character is supercritical CO
2there is superpower extracting power, as supercritical CO
2abstraction technique etc.; It then proposes stern challenge to the sealing/unlatching of reactor: easily permeate during sealing and cause pressure drop; Then because sealing ring 205 is by CO during unlatching
2osmotic swelling and not easily opening.In view of sealing, the utility model have employed the fixed form that sealing ring 205 combines with jump ring; For unlatching, the utility model have employed the fixing mode of fastening cover 202: because the screw thread between fastening cover 202 with kettle 1 does not contact CO
2, therefore unlatching is easily, when inner seal rings 205 expands and not easily opens, then to reaction chamber 105 to apply to upward pressure by pressurizing chamber 106, with the unlatching of auxiliary interior seal cover 201.
Enumerate the example of several carbon dioxide core damage utilizing the utility model to carry out below:
Embodiment one, pure CO
2the static core damage of medium:
S11, will treat that injury rock core is placed in reaction chamber 105, particle/pulverized specimen first should load large order number and breathe freely in sample sack and be placed in reactor again, prevents from blocking gas circuit, installs lid and blocked jump ring; Whole reactor is placed in target temperature, can adopts: the mode such as water-bath, insulating box realizes;
S12, closedown pressure medium discrepancy valve 103, reaction medium enter valve, open reaction medium outlet valve 204 and connect vavuum pump; Open vavuum pump to after vacuumizing certain hour in still, close vavuum pump and reaction medium outlet valve 204; Disconnect the connection of reaction medium outlet valve 204 and vavuum pump;
S13, by CO
2gas cylinder was received on communicating pipe 1041, opened reaction medium and entered valve air inlet; When pressure in still stops air inlet a little less than during goal pressure;
S14, safety valve 101 is adjusted to safe pressure value higher than goal pressure; Be communicated with high pressure hand-operated measuring pump 302 by joint 301 pipeline of being come in and gone out by pressure medium, carry out compensating liquid pressurization with high pressure hand-operated measuring pump 302, now piston 102 moves on starting, until reach target pressure value; For guaranteeing that pressurizing chamber 106 has enough liquid volumes, in compensating liquid pressure process, when pressure is higher than goal pressure, by opening reaction medium outlet valve 204, discharges the mode of a part of carbon dioxide and regulate;
Material in S15, wait inner chamber reaches stable state: in this process during pressure oscillation, the mode by the duty switching high pressure hand-operated measuring pump 302 carries out supercharging or decompression;
The stable also persistent goal time t of S16, maintenance temperature T, pressure P, t is herein the injury time;
S17, disconnect joint 301, slowly open pressure medium valve 103 of coming in and going out and released by fluid under pressure in this process, piston 102 slowly declines; Also reaction medium outlet valve 204 secondary buck can be opened when being down to low pressure;
S18, open reactor, be separated kettle 1 and lid, taking-up sample; Test complete.
Embodiment two, CO
2+ H
2the static core damage of O blending agent:
S21, by waiting to injure rock core, the mineralized water of target volume is placed in reaction chamber 105 successively, and particle/pulverized specimen first should load large order number and breathe freely in sample sack and be placed in reactor again, prevents from blocking gas circuit, installs lid and blocked jump ring; Whole reactor is placed in target temperature, can adopts: the mode such as water-bath, insulating box realizes;
S22, closedown pressure medium discrepancy valve 103, open reaction medium outlet valve 204; By CO
2gas cylinder was received on communicating pipe 1041, opened reaction medium and entered the slow air inlet of valve; After certain hour, with the gas at moistening pH test paper test reaction media outlet valve 204 place, if test paper instruction pH ≈ 4 ~ 6, then think that the air in still has been driven complete by row, off-response media outlet valve 204; Continue to enter valve air inlet by reaction medium, when pressure in still stops air inlet a little less than during goal pressure;
S23, step S14-S17 with embodiment one;
S24, open reactor, be separated kettle 1 and lid, taking-up sample the liquid collected in inner chamber;
S25, cleaning reaction still, be placed in air dry oven dry in time; Test complete.
Embodiment three, CO
2medium (pure CO
2or CO
2+ H
2o) dynamic core damage
S31, closedown pressure medium discrepancy valve 103, open reaction medium outlet valve 204; And by CO
2after gas cylinder connection reaction medium enters valve, open reaction medium and enter the slow air inlet of valve; After certain hour, with the gas of moistening pH test paper test reaction media outlet valve 204, if test paper instruction pH ≈ 4 ~ 6, then think that the air in still has been driven complete by row, off-response media outlet valve 204; Reaction medium outlet valve 204 is connected with core holding unit by connecing six-way valve.Enter valve by reaction medium and continue air inlet, when pressure in still stops air inlet a little less than during goal pressure;
S32, regulation safety valve 101 to safe pressure; Pressure medium discrepancy valve 103 connects high pressure hand-operated measuring pump 302 and carries out compensating liquid pressurization, replace because displacement process needs to continue to add pressure medium, so place changes the high pressure hand-operated measuring pump 302 when being in static state into constant-flux pump and operates, until reach goal pressure;
S33, six-way valve connect another inlet pipeline;
S34, will treat that injury rock core adds core holding unit, and open reaction medium outlet valve 204 pairs of core holding unit inside after pipeline before and after connecting and carry out CO
2displacement; Close this gas circuit after a period of time and stop air inlet, open inlet pipeline and continue displacement; Continue the CO that hockets
2displacement and water drive are replaced, and after circulation certain hour, stop displacement;
S35, disassembly, cleaning equipment, complete experiment.
Six-way valve herein, core holding unit, inlet pipeline etc., all do not show in accompanying drawing.
The utility model can be simulated near well head in low-pressure area, wet method CO
2core damage experiment in fracturing process, also can simulate dry method CO
2core damage experiment in fracturing process, concrete participation embodiment one and embodiment two.According to CO
2phasor, in the scope of 0 ~ 10 DEG C, pressure>=3 ~ 4.5MPa can form liquid CO
2; Therefore only reactor need be placed in low-temperature circulating water-bath constant temperature 0 ~ 10 DEG C, CO
2the pressure of gas cylinder itself can meet requirement of experiment, in view of the requirement of safe pressure, needs piston 102 to be promoted to certain altitude.
Overcritical/moisture CO
2how to form supercritical CO to the difficult point of the damage experiment of rock core
2, according to CO
2special nature, have two kinds of methods to realize:
1. first reactor is placed in the isoperibol of > 31.26 DEG C, utilizes special CO afterwards
2force (forcing) pump pressurizes; Advantage is temperature constant, shortcoming be invest higher.
2. CO is utilized
2the phase-state change of itself, first pumps into a certain amount of liquid CO
2, then be warming up to more than critical-temperature, carry out pressure adjustment.The method only need to be advanced line number time pressure regulation in pressure stability, and efficiency is high, reduce investment outlay.
The utility model can also simulate fracturing fluid in crack whole broken glue process to the injury of rock core, see embodiment two.
The utility model is mainly for supercritical CO
2the damage experiment of rock core is designed, but effect of the present utility model and purposes include but not limited to CO
2medium.
As can be seen from the above embodiments, the utility model is by arranging the piston 102 that freely up and down can slide in inner chamber, and inner chamber is separated into two relatively independent chambers, the medium in two chambers can not mix; By changing the pressure in pressurizing chamber 106, the adjustment to pressure in reaction chamber 105 can be realized, the Volume Changes difference situation greatly of three-phase material when changing in conjunction with uniform pressure again, select liquid as pressure medium, pressure regulation is that the pressure medium amount needing to increase or discharge is less, and pressure regulation is convenient, speed is fast; Because carbon dioxide is heavier than air, therefore consider the bottom being arranged on inner chamber communicating pipe 1041, the convenient air driven away in inner chamber; On the whole, the utility model can realize some beneficial effect following:
1, liquid auxiliary security pressure control: can to realize fast, the highest safe pressure controlled effectively, reposefully in inner chamber;
2, liquid assists steady pressure regulation: can realize fast, increase steadily, in real time or reduce the pressure in reaction chamber 105;
3, deaeration interference: this problem all do not considered by gas reaction still at present, and when especially gas-liquid two-phase coexists, the design of bottom communicating pipe 1041 is very necessary.
The above is only preferred embodiment of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and replacement, these improve and replace and also should be considered as protection domain of the present utility model.
Claims (10)
1. one kind for supercritical CO
2the reaction unit of core damage, is characterized in that, comprising: kettle (1) and lid, and described kettle (1) is provided with inner chamber; Described lid comprises seal cover (201) and fastening cover (202), described seal cover (201) is tightly connected with the opening of described inner chamber, described fastening cover (202) and described kettle (1) are fastenedly connected, and described fastening cover (202) is for fixing described seal cover (201).
2. as claimed in claim 1 for supercritical CO
2the reaction unit of core damage, it is characterized in that, described seal cover (201) is provided with the seal section matched with the opening of described inner chamber, the outside of described seal section is provided with sealing ring (205), and described seal cover (201) is tightly connected by the opening part of described sealing ring (205) with described inner chamber.
3. as claimed in claim 2 for supercritical CO
2the reaction unit of core damage, is characterized in that, described seal cover (201) is placed in described fastening cover (202), and described fastening cover (202) is connected with described kettle (1) by screw thread.
4. as claimed in claim 3 for supercritical CO
2the reaction unit of core damage, is characterized in that, described fastening cover (202) is also connected with the locking unit rotated for limiting it, and described locking unit is jump ring.
5. as claimed in claim 4 for supercritical CO
2the reaction unit of core damage, is characterized in that, the middle part of described seal cover (201) is fixedly connected with the pipeline with described inner space, and the middle part of described fastening cover (202) is set on described pipeline; Described jump ring is connected between described fastening cover (202) and pipeline.
6. as claimed in claim 1 for supercritical CO
2the reaction unit of core damage, is characterized in that, being provided with in described inner chamber can the piston (102) of vertically movement, and described piston (102) contacts with the inner wall sealing of described inner chamber; Described inner chamber is separated into reaction chamber (105) and pressurizing chamber (106) by described piston (102), and described reaction chamber (105) is positioned at the top of described pressurizing chamber (106).
7. as claimed in claim 6 for supercritical CO
2the reaction unit of core damage, it is characterized in that, described pressurizing chamber (106) is connected with safety valve (101) by pipeline, described safety valve (101), for detecting that the pressure in pressurizing chamber (106) is opened automatically higher than during preset security force value, carries out row pressure to described pressurizing chamber (106).
8. as claimed in claim 1 for supercritical CO
2the reaction unit of core damage, is characterized in that, is provided with position-limiting unit between described seal cover (201) and described kettle (1), and described position-limiting unit rotates for limiting described seal cover (201).
9. as claimed in claim 8 for supercritical CO
2the reaction unit of core damage, is characterized in that, described position-limiting unit is the projection be arranged on described seal cover (201) and the groove be arranged on described kettle (1).
10. as claimed in claim 9 for supercritical CO
2the reaction unit of core damage, is characterized in that, described projection is arranged on the top of described seal cover (201) side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520595661.3U CN205032150U (en) | 2015-08-07 | 2015-08-07 | A reaction unit for overcritical CO2 rock core damage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520595661.3U CN205032150U (en) | 2015-08-07 | 2015-08-07 | A reaction unit for overcritical CO2 rock core damage |
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| CN205032150U true CN205032150U (en) | 2016-02-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107824127A (en) * | 2017-11-21 | 2018-03-23 | 北京新锐得环保科技有限公司 | A kind of interior clamshell high-pressure installation |
| CN108894773A (en) * | 2018-06-20 | 2018-11-27 | 长江大学 | Supercritical CO2Pressure break cement gel junction fracturing experimental facilities and method |
| CN110961034A (en) * | 2018-09-28 | 2020-04-07 | 中国科学院大连化学物理研究所 | Reactor for solid nuclear magnetic resonance spectrum research under high-temperature high-pressure chemical reaction in-situ reaction condition |
-
2015
- 2015-08-07 CN CN201520595661.3U patent/CN205032150U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107824127A (en) * | 2017-11-21 | 2018-03-23 | 北京新锐得环保科技有限公司 | A kind of interior clamshell high-pressure installation |
| CN108894773A (en) * | 2018-06-20 | 2018-11-27 | 长江大学 | Supercritical CO2Pressure break cement gel junction fracturing experimental facilities and method |
| CN110961034A (en) * | 2018-09-28 | 2020-04-07 | 中国科学院大连化学物理研究所 | Reactor for solid nuclear magnetic resonance spectrum research under high-temperature high-pressure chemical reaction in-situ reaction condition |
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