CN103452548A - Experimental device and method for evaluating rock characteristics of steam reforming reservoir - Google Patents
Experimental device and method for evaluating rock characteristics of steam reforming reservoir Download PDFInfo
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- CN103452548A CN103452548A CN2013103465557A CN201310346555A CN103452548A CN 103452548 A CN103452548 A CN 103452548A CN 2013103465557 A CN2013103465557 A CN 2013103465557A CN 201310346555 A CN201310346555 A CN 201310346555A CN 103452548 A CN103452548 A CN 103452548A
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- 239000011435 rock Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000000629 steam reforming Methods 0.000 title abstract 2
- 238000010793 Steam injection (oil industry) Methods 0.000 claims abstract description 43
- 238000012544 monitoring process Methods 0.000 claims abstract description 42
- 238000011156 evaluation Methods 0.000 claims abstract description 30
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 239000011229 interlayer Substances 0.000 claims abstract description 23
- 230000009466 transformation Effects 0.000 claims abstract description 23
- 230000007797 corrosion Effects 0.000 claims abstract description 17
- 238000005260 corrosion Methods 0.000 claims abstract description 17
- 238000000605 extraction Methods 0.000 claims abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 10
- 238000004458 analytical method Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 50
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 10
- 238000002474 experimental method Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 6
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- -1 ether ether ketone Chemical class 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 10
- 238000011161 development Methods 0.000 abstract description 5
- 238000013170 computed tomography imaging Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 8
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- 238000004090 dissolution Methods 0.000 description 5
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- 230000018109 developmental process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 1
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Abstract
The invention relates to a steam reforming reservoir rock characteristic evaluation experimental device and a method, wherein the experimental device comprises a model system, a steam injection system, a steam extraction system, a confining pressure control system, an overlying pressure control system, a vacuumizing system, a fluid analysis system and an image acquisition and analysis system; steam is injected from the steam chamber to provide a high-temperature and high-pressure contact environment for the bottom of the full-diameter core of the actual core, the steam monitoring chamber provides the actual oil deposit overburden pressure, and the steam is used for simulating the transformation of the pore structure of the core at the upper part of the steam injection well and the corrosion action on the interlayer core in the steam injection process in the actual oil deposit; sampling and analyzing fluid at the top of the rock core in a steam monitoring chamber, and monitoring the steam breakthrough condition of different rock core samples in time; and the industrial CT imaging scans the rock core at proper time, analyzes the corrosion and breakthrough conditions of different rock core samples under different steam injection conditions, and provides key operation parameters for the steam injection development of the heterogeneous oil reservoir with a large amount of developed interlayers.
Description
Technical field
The invention relates to rock characteristic evaluation experimental device and method in the oil development field, relate in particular to a kind of high temperature and high pressure steam that can be used for to the corrosion of dissimilar rock and the steam transformation reservoir petrologic characteristic evaluation experimental device and method of reformation characteristics description and Visual evaluation.
Background technology
Be subject to the continental deposit ambient influnence, China's HEAVY OIL RESERVOIR non-homogeneity is generally stronger, grow a large amount of interlayers is arranged in reservoir, wherein, interlayer refers to the interlayer be comprised of part mud stone, siltstone or calcareous mineralogical composition, interlayer inside has certain permeability, and permeability is 1～0.0001 * 10 usually
-3um
2.In the steam flooding of heavy oil reservoir process, because the interlayer permeability is very low, interlayer plays and significantly blocks impact the growth of vapor chamber, stop to a certain extent vapor chamber at the upwards onlap of reservoir inside and outwards continue expansion, thereby having influence on yield level and the ultimate recovery of effectively the employing of interlayer top oil reservoir reserves, steam injection development oil reservoir.But because the chance of the shale composition in interlayer high-temperature steam condensed water can occur to dissolve and corrosion, and in the steam injection process, the pressure of steam injection and temperature all can produce material impact to the corrosion speed of interlayer, therefore, by carrying out the corrosion laboratory experiment of dissimilar interlayer under the steam injection condition, can obtain the speed of the dissimilar interlayer of steam corrosion, the important parameters such as the operating pressure of steam corrosion interlayer the best and temperature, and steam is finally broken through the time that the interlayer continuation is upwards expanded, for instructing the Oil Field steam injection to break through interlayer, realize that the expansion of vapor chamber Quick uniform has great importance with high-efficiency mining.
In addition, steam directly has influence on the growth of vapor chamber to the transformation of reservoir rock, to the low permeability reservoir rock, long period of soaking is under steam ambient, due to the change along with hot conditions such as rock degree of consolidation, wetability, the crucial physical property such as reservoir internal void structure, permeability can change thereupon, quantitative description and the transformation effect of analysis steam to reservoir rock, and the regulation measure that the vapor chamber of heterogeneous reservoir is evenly grown is formulated most important.
The Visual evaluation that does not at present also have systematic method and apparatus, for high temperature and high pressure steam, transformation and the Dissolution Characteristics of dissimilar reservoir rock are described to process.
Thus, the inventor, by means of being engaged in experience and the practice of relevant industries for many years, proposes a kind of steam transformation reservoir petrologic characteristic evaluation experimental device and method, to overcome the defect of prior art.
Summary of the invention
The object of the present invention is to provide a kind of steam transformation reservoir petrologic characteristic evaluation experimental device and method, for high temperature and high pressure steam, the transformation of dissimilar reservoir rock and Dissolution Characteristics are described to process, carry out Visual evaluation.
The object of the present invention is achieved like this, a kind of steam transformation reservoir petrologic characteristic evaluation experimental device, and described experimental facilities comprises:
Model system, described model system forms by being fixedly installed on the rock core arranged in clamper in a hyperbaric chamber and clamper thereof; Described clamper comprises tubular body, and this tubular body is sealed at both ends, and to be provided with the end stifled, and described rock core is fixedly installed on the tubular body middle part, at the bottom of a described side, between stifled and rock core, forms steam monitoring chamber, at the bottom of described opposite side, between stifled and rock core, forms vaporium;
The steam injection system, described steam injection system is comprised of steam generator and the first one way valve, and this steam injection system is passed through the line seal conducting in vaporium;
Steam extraction system, described steam extraction system is comprised of the second one way valve, condenser, back-pressure valve, and this steam extraction system is passed through the line seal conducting in vaporium;
The confined pressure control system, described confined pressure control system is comprised of the first gas cylinder, the first gas flow controller, the first gas boosting pump, the 3rd one way valve, and this confined pressure control system is passed through the line seal conducting in hyperbaric chamber;
The burden pressure control system, described burden pressure control system is comprised of the second gas cylinder, the second gas flow controller, the second gas boosting pump, the 4th one way valve, and this burden pressure control system is monitored chamber by the line seal conducting in steam;
Pumped vacuum systems, described pumped vacuum systems is comprised of vacuum pump and the 5th one way valve be arranged in parallel, the 6th one way valve and the 7th one way valve, and described the 5th, the 6th and the 7th one way valve is monitored chamber by the line seal conducting in hyperbaric chamber, vaporium, steam respectively;
Fluid analytical systems, described fluid analytical systems is comprised of sampler, gas collection bottle, condensation water collection bottle, the 8th one way valve, and this fluid analytical systems is monitored chamber by the line seal conducting in steam;
IMAQ and analytical system, it is comprised of industry CT and computer; Described hyperbaric chamber is arranged in the scanning cabin of industry CT movably.
In a better embodiment of the present invention, described clamper is vertical placement, and rock core top is steam monitoring chamber, and the rock core bottom is vaporium; The end of upper/lower terminal is stifled is that thread seal is connected with tubular body; Corresponding line seal is stifled through the described upper and lower end.
In a better embodiment of the present invention, between described rock core both sides and the upper and lower end are stifled, sequentially be provided with grommet, support ring and joint ring.
In a better embodiment of the present invention, be equipped with respectively a sealing-plug during the described upper and lower end is stifled, described sealing-plug blocked up as being threaded the end of with; Corresponding line seal is monitored chamber or vaporium through described sealing-plug conducting in corresponding steam.
In a better embodiment of the present invention, described two support ring wall thickness are 1/4 of described clamper internal diameter, and described two grommet internal diameters are 1/2 of described clamper internal diameter.
In a better embodiment of the present invention, described hyperbaric chamber, clamper and inner grommet thereof, the material of support ring are the heat resisting and pressure resisting ether ether ketone for the CT transmission scan; 250 ℃ of the high-temperature resistants of described clamper, the highest withstand voltage 12～13MPa of described clamper and hyperbaric chamber.
In a better embodiment of the present invention, the first gas cylinder in described confined pressure control system is nitrogen cylinder.
In a better embodiment of the present invention, described hyperbaric chamber, vaporium and the indoor temperature and pressure monitor that is respectively equipped with of steam monitoring.
Purpose of the present invention is realization like this, and a kind of steam transformation reservoir petrologic characteristic evaluation experimental method said method comprising the steps of:
A, pipeline and model connect;
The tubular body of described clamper is erect and placed, and at the bottom of its bottom adopts internal thread and bottom, stifled external screw thread is tightly connected, and at the bottom of described bottom, blocks up and also adopts and be threaded with described sealed bottom plug; Block side and put a joint ring at the bottom of the bottom of described clamper, on sealing ring top, put a support ring, on this support ring top, put a grommet, place testing rock core at this above grommet; Place another grommet on described rock core top, place another support ring on this another grommet top, place another joint ring on this another support ring top, at the bottom of described clamper top is adopted to internal thread and top, stifled external screw thread is tightly connected and seals, and stifled at the bottom of described top and described top seal plug are adopted and be threaded and seal; The described clamper utilization connected is bolted to hyperbaric chamber inside, and closes hyperbaric chamber;
B, model vacuumize;
Utilize the vacuum pump of described pumped vacuum systems that vaporium, steam monitoring chamber and hyperbaric chamber are vacuumized;
C, steam injection;
Open steam generator, open the first one way valve, by respective line to steam injection in vaporium;
D, burden pressure are controlled;
Open the second gas cylinder, the second gas flow controller, the second gas boosting pump, the 4th one way valve, utilize the second gas boosting pump to monitor indoor nitrogen injection to steam, and utilize vaporium and steam to monitor indoor temperature and pressure monitor timely monitor vaporium and steam and monitor indoor pressure and change, the vaporium internal pressure is monitored room pressure a little more than steam, and both differences are no more than 0.5MPa;
E, confined pressure are controlled;
Open the first gas cylinder, the first gas flow controller, the first gas boosting pump, the 3rd one way valve, utilize described the first gas boosting pump to nitrogen injection in hyperbaric chamber, so that model is produced to confined pressure; Utilize confined pressure pressure in the temperature and pressure monitor timely monitor hyperbaric chamber in hyperbaric chamber, control confined pressure a little less than described steam monitoring chamber pressure, both differences are no more than 0.2Mpa;
F, extraction steam;
When steam monitoring room pressure is elevated to experiment test pressure, close the 4th one way valve of described upper-coated pressure system, open the second one way valve of described steam extraction system, by described back-pressure valve pressure setting, be experiment test pressure, continuation is by described steam injection system steam injection, control steam rate of withdrawal and pressure by back-pressure valve, to guarantee described vaporium internal pressure temperature constant simultaneously;
G, rock core top fluid analysis;
At set intervals, open the 8th one way valve of described fluid analytical systems, utilize described sampler from described steam monitoring chamber samples fluid, in observation condensation water collection bottle, whether have condensed water to occur, thereby judgement steam is broken through the time of rock core; In the time of every sub-sampling, open the 4th one way valve of described upper-coated pressure system, to the indoor supplementary nitrogen of described steam monitoring, with the pressure of the described steam monitoring of balance chamber;
H, rock core pore structure change scanning and analyze;
Utilize the industry CT of described IMAQ and analytical system to be scanned and imaging model, analyze under the high-temperature steam environment in good time, different temperature and pressure condition are to the reformation characteristics of rock core pore structure and the variation characteristic of steam corrosion interlayer rock.
In a better embodiment of the present invention, in step G: sample frequency is: once/per hour～once/every day; For the accurate indoor condensed water that occurs of judgement steam monitoring, do not cause again that steam monitors indoor pressure oscillation simultaneously, the fluid volume of every sub-sampling is 0.1～0.2 liter.
In a better embodiment of the present invention, in step H: scan frequency be 2～6 hours once.
From the above mentioned, steam of the present invention transformation reservoir petrologic characteristic evaluation experimental device and method, can describe process to the transformation of dissimilar reservoir rock and Dissolution Characteristics for high temperature and high pressure steam and carry out Visual evaluation; Utilize described vaporium steam injection to provide the contact environment of a HTHP for actual full-hole core bottom of getting core, utilize steam monitoring chamber that actual oil reservoir burden pressure is provided, can simulate in actual oil reservoir in the steam injection process, steam injection is to the transformation of aboveground rock core pore structure of steam injection and to the corrosion of interlayer rock core; Utilization is monitored indoor rock core top fluid sample analysis from described steam, but the steam of the different rock core samples of timely monitor is broken through situation; Utilize the industry CT imaging in good time to rock core scanning, can analyze corrosion and the breakthrough situation of different rock core samples under different steam injection conditions, for a large amount of heterogeneous reservoir steam injection developments of growing of interlayer provide crucial operating parameter.
The accompanying drawing explanation
The following drawings only is intended to the present invention is done and schematically illustrates and explain, not delimit the scope of the invention.Wherein:
Fig. 1: be the structural representation of steam transformation reservoir petrologic characteristic evaluation experimental device of the present invention.
Fig. 2: be the clamper internal construction schematic diagram of experimental facilities of the present invention.
The specific embodiment
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, now contrast accompanying drawing explanation the specific embodiment of the present invention.
As shown in Figure 1 and Figure 2, the present invention proposes a kind of steam transformation reservoir petrologic characteristic evaluation experimental device 100, and described experimental facilities 100 comprises: model system 1, steam injection system 2, steam extraction system 3, confined pressure control system 4, burden pressure control system 5, pumped vacuum systems 6, fluid analytical systems 7 and IMAQ and analytical system 8;
Described model system 1 forms by being fixedly installed on the interior clamper 11 of a hyperbaric chamber 13 and the rock core 12 of clamper 11 interior settings thereof; As shown in Figure 2, in the present embodiment, described clamper 11 is vertical placement, described clamper 11 comprises cylindrical-shaped main body 111, these cylindrical-shaped main body 111 upper/lower terminal sealings are provided with the end stifled 112,113, described rock core 12 is fixedly installed on cylindrical-shaped main body 111 middle parts, at the bottom of described upside stifled 112 with rock core 12 between form steam monitoring chamber 114, at the bottom of described downside stifled 113 and rock core 12 between formation vaporium 115; Situation is broken through for the steam at timely monitor reservoir core top in described steam monitoring chamber 114; Described vaporium 115 is used to the reservoir core bottom that the constant temperature and pressure steam ambient is provided, with the corrosion reservoir core; Sequentially be provided with grommet 116, support ring 117 and joint ring 118 at the described rock core 12 both sides and upper and lower end stifled 112,113; Be equipped with respectively a sealing-plug 119 at the described upper and lower end stifled 112,119;
Described steam injection system 2 is comprised of steam generator 21 and the first one way valve 22, and this steam injection system 2 is passed through the line seal conducting in vaporium 115;
Described steam extraction system 3 is comprised of the second one way valve 31, condenser 32, back-pressure valve 33, and this steam extraction system 3 is passed through the line seal conducting in vaporium 115;
Described confined pressure control system 4 is comprised of the first gas cylinder 41, the first gas flow controller 42, the first gas boosting pump 43, the 3rd one way valve 44, and this confined pressure control system 4 is passed through the line seal conducting in hyperbaric chamber 13;
Described burden pressure control system 5 is comprised of the second gas cylinder 51, the second gas flow controller 52, the second gas boosting pump 53, the 4th one way valve 54, and this burden pressure control system 5 is monitored chamber 114 by the line seal conducting in steam;
Described pumped vacuum systems 6 is comprised of vacuum pump 61 and the 5th one way valve 62, the 6th one way valve 63 and the 7th one way valve 64 that are arranged in parallel, described the 5th, the 6th and the 7th one way valve respectively by the line seal conducting in hyperbaric chamber 13, vaporium 115, steam monitoring chamber 114;
Described fluid analytical systems 7 is comprised of sampler 71, gas collection bottle 72, condensation water collection bottle 73, the 8th one way valve 74, and this fluid analytical systems 7 is monitored chamber 114 by the line seal conducting in steam; The sample tap of described sampler 71 is close to steam monitoring interior reservoir core top, chamber 114, utilize described sampler to extract steam in good time and monitor indoor fluid sample, analyze condensed water content, can monitor the steam break through of different-thickness reservoir core, and carry out the quantitative analysis that affects that vaporium stress level and pressure pulse break through steam;
IMAQ and analytical system 8 are comprised of industry CT 81 and computer 82; Described hyperbaric chamber 13 is arranged in the scanning cabin of industry CT 81 movably.In the present embodiment, described hyperbaric chamber 13 external dimensions are less than the scanning cabin of described industry CT, in order on described industry CT, described model system is carried out to on-line continuous scanning, and utilize described computer to be analyzed scan image, can carry out visual accurate description to the pore structure variation characteristic of reservoir core and the Dissolution Characteristics of steam.
Further, as shown in Figure 2, the end of upper/lower terminal stifled 112,113, be connected for thread seal with cylindrical-shaped main body 111; Described sealing-plug 119 is stifled also for being threaded with each end; Corresponding line seal is monitored chamber 114 or vaporium 115 through described upper and lower sealing-plug 119 conductings in corresponding steam; Described sealing-plug is for introducing described filling line and monitoring pipeline, and the corresponding pipeline outside is tightly connected with high temperature high voltage resistant rubber and sealing-plug.
In the present embodiment, described two support ring 117 wall thickness are 1/4 of described clamper internal diameter, and described two grommet 116 internal diameters are 1/2 of described clamper internal diameter; Described grommet 116 effects are fixing test rock core 12, in case rock core collapses suddenly in the corrosion process; The position of described lower support ring 117 inner hollow forms vaporium 115, and the position of upper support ring 117 inner hollow forms steam monitoring chamber 114.
In the present embodiment, described hyperbaric chamber 13, clamper 11 and inner grommet 116 thereof, the material of support ring 117 are can be for heat resisting and pressure resisting ether ether ketone (PEEK) material of CT transmission scan; 250 ℃ of the high-temperature resistants of described clamper 11, described clamper 11 and the highest withstand voltage 12～13MPa of hyperbaric chamber 13.
The first gas cylinder 41 in described confined pressure control system 4 is nitrogen cylinder, because nitrogen has good heat-proof quality, therefore can play the adiabatic heat-insulation effect to clamper 11, simultaneously because gas has better mobility, therefore use nitrogen as confined pressure gas, can realize that each position equilibrium is exerted pressure to clamper.
In the present embodiment, be respectively equipped with temperature and pressure monitor 9 in described hyperbaric chamber 13, vaporium 115 and steam monitoring chamber 114.
The present invention also provides a kind of and utilizes above-mentioned steam transformation reservoir petrologic characteristic evaluation experimental device 100 to carry out the method for evaluation experimental, said method comprising the steps of:
A, pipeline and model connect;
The tubular body of described clamper 11 111 is erect and placed, and at the bottom of its bottom employing internal thread and bottom, stifled 113 external screw thread is tightly connected, and at the bottom of described bottom, stifled 113 also adopt and are threaded with described sealed bottom plug 119; At the bottom of the bottom of described clamper, stifled 113 upsides are put a joint ring 118, on sealing ring 118 tops, put a support ring 117, on this support ring top, put a grommet 116, place testing rock core 12 above grommet 116 at this; Place another grommet 116 on described rock core 12 tops, place another support ring 117 on these another grommet 116 tops, place another joint ring 118 on these another support ring 117 tops, the external screw thread that blocks up 112 at the bottom of described clamper top employing internal thread and top is tightly connected and seals, by blocking up 112 at the bottom of described top, with described top seal plug 119, adopt and be threaded and seal; Utilize bolt (four equally distributed bolts) to be fixed on hyperbaric chamber 13 inside the described clamper connected 11, and close hyperbaric chamber 13;
B, model vacuumize;
Utilize the vacuum pump 61 of described pumped vacuum systems 6 that vaporium 115, steam monitoring chamber 114 and hyperbaric chamber 13 are vacuumized;
C, steam injection;
Open steam generator 21, open the first one way valve 22, by respective line to the interior steam injection of vaporium 115;
D, burden pressure are controlled;
Open the second gas cylinder 51, the second gas flow controller 52, the second gas boosting pump 53, the 4th one way valve 54, utilize the second gas boosting pump 53 to the interior nitrogen injection in steam monitoring chamber 114, and utilize temperature and pressure monitor 9 timely monitor vaporiums and steam in vaporium 115 and steam monitoring chamber 114 to monitor indoor pressure variation, vaporium 115 internal pressures are a little more than steam monitoring chamber 114 internal pressures, and both differences are no more than 0.5MPa;
E, confined pressure are controlled;
Open the first gas cylinder 41, the first gas flow controller 42, the first gas boosting pump 43, the 3rd one way valve 44, utilize described the first gas boosting pump 43 to the interior nitrogen injection of hyperbaric chamber 13, so that model is produced to confined pressure; Utilize confined pressure pressure in the temperature and pressure monitor 9 timely monitor hyperbaric chambers in hyperbaric chamber, control confined pressure a little less than described steam monitoring chamber 114 pressure, both differences are no more than 0.2Mpa;
F, extraction steam;
When steam monitoring room pressure is elevated to experiment test pressure, close the 4th one way valve 54 of described upper-coated pressure system 5, open the second one way valve 31 of described steam extraction system 3, by described back-pressure valve 33 pressure settings, be experiment test pressure, continuation is by described steam injection system 2 steam injections, control steam rate of withdrawal and pressure by back-pressure valve 33, to guarantee described vaporium 115 internal pressure temperature constant simultaneously;
G, rock core top fluid analysis;
At set intervals, open the 8th one way valve 74 of described fluid analytical systems 7, utilize described sampler 71 from described steam monitoring chamber 114 samples fluid, sample frequency is: once/per hour～once/every day; In observation condensation water collection bottle 72, whether have condensed water to occur, thereby judgement steam is broken through the time of rock core; For the accurate interior condensed water that occurs in judgement steam monitoring chamber 114, do not cause again that steam monitors indoor pressure oscillation simultaneously, the fluid volume of every sub-sampling is 0.1～0.2 liter; In the time of every sub-sampling, open the 4th one way valve 54 of described upper-coated pressure system 5, to the interior supplementary nitrogen in described steam monitoring chamber 114, with the pressure of the described steam monitoring of balance chamber;
H, rock core pore structure change scanning and analyze;
Utilize 81 pairs of models of industry CT of described IMAQ and analytical system to be scanned and imaging, scan frequency be 2～6 hours once; Analyze under the high-temperature steam environment, different temperature and pressure condition are to the reformation characteristics of rock core pore structure and the variation characteristic of steam corrosion interlayer rock in good time.
From the above mentioned, steam of the present invention transformation reservoir petrologic characteristic evaluation experimental device and method, can describe process to the transformation of dissimilar reservoir rock and Dissolution Characteristics for high temperature and high pressure steam and carry out Visual evaluation; Utilize described vaporium steam injection to provide the contact environment of a HTHP for actual full-hole core bottom of getting core, utilize steam monitoring chamber that actual oil reservoir burden pressure is provided, can simulate in actual oil reservoir in the steam injection process, steam injection is to the transformation of aboveground rock core pore structure of steam injection and to the corrosion of interlayer rock core; Utilization is monitored indoor rock core top fluid sample analysis from described steam, but the steam of the different rock core samples of timely monitor is broken through situation; Utilize the industry CT imaging in good time to rock core scanning, can analyze corrosion and the breakthrough situation of different rock core samples under different steam injection conditions, for a large amount of heterogeneous reservoir steam injection developments of growing of interlayer provide crucial operating parameter.
The foregoing is only the schematic specific embodiment of the present invention, not in order to limit scope of the present invention.Any those skilled in the art, the equivalent variations of having done under the prerequisite that does not break away from design of the present invention and principle and modification, all should belong to the scope of protection of the invention.
Claims (11)
1. a steam is transformed reservoir petrologic characteristic evaluation experimental device, and it is characterized in that: described experimental facilities comprises:
Model system, described model system forms by being fixedly installed on the rock core arranged in clamper in a hyperbaric chamber and clamper thereof; Described clamper comprises tubular body, and this tubular body is sealed at both ends, and to be provided with the end stifled, and described rock core is fixedly installed on the tubular body middle part, at the bottom of a described side, between stifled and rock core, forms steam monitoring chamber, at the bottom of described opposite side, between stifled and rock core, forms vaporium;
The steam injection system, described steam injection system is comprised of steam generator and the first one way valve, and this steam injection system is passed through the line seal conducting in vaporium;
Steam extraction system, described steam extraction system is comprised of the second one way valve, condenser, back-pressure valve, and this steam extraction system is passed through the line seal conducting in vaporium;
The confined pressure control system, described confined pressure control system is comprised of the first gas cylinder, the first gas flow controller, the first gas boosting pump, the 3rd one way valve, and this confined pressure control system is passed through the line seal conducting in hyperbaric chamber;
The burden pressure control system, described burden pressure control system is comprised of the second gas cylinder, the second gas flow controller, the second gas boosting pump, the 4th one way valve, and this burden pressure control system is monitored chamber by the line seal conducting in steam;
Pumped vacuum systems, described pumped vacuum systems is comprised of vacuum pump and the 5th one way valve be arranged in parallel, the 6th one way valve and the 7th one way valve, and described the 5th, the 6th and the 7th one way valve is monitored chamber by the line seal conducting in hyperbaric chamber, vaporium, steam respectively;
Fluid analytical systems, described fluid analytical systems is comprised of sampler, gas collection bottle, condensation water collection bottle, the 8th one way valve, and this fluid analytical systems is monitored chamber by the line seal conducting in steam;
IMAQ and analytical system, it is comprised of industry CT and computer; Described hyperbaric chamber is arranged in the scanning cabin of industry CT movably.
2. steam as claimed in claim 1 is transformed reservoir petrologic characteristic evaluation experimental device, and it is characterized in that: described clamper is vertical placement, and rock core top is steam monitoring chamber, and the rock core bottom is vaporium; The end of upper/lower terminal is stifled is that thread seal is connected with tubular body; Corresponding line seal is stifled through the described upper and lower end.
3. steam transformation reservoir petrologic characteristic evaluation experimental device as claimed in claim 2, is characterized in that: between described rock core both sides and the upper and lower end are stifled, sequentially be provided with grommet, support ring and joint ring.
4. steam as claimed in claim 3 is transformed reservoir petrologic characteristic evaluation experimental device, it is characterized in that: be equipped with respectively a sealing-plug during the described upper and lower end is stifled, described sealing-plug blocked up as being threaded the end of with; Corresponding line seal is monitored chamber or vaporium through described sealing-plug conducting in corresponding steam.
5. steam as claimed in claim 3 is transformed reservoir petrologic characteristic evaluation experimental device, and it is characterized in that: described two support ring wall thickness are 1/4 of described clamper internal diameter, and described two grommet internal diameters are 1/2 of described clamper internal diameter.
6. steam as claimed in claim 4 is transformed reservoir petrologic characteristic evaluation experimental device, it is characterized in that: described hyperbaric chamber, clamper and inner grommet thereof, the material of support ring are the heat resisting and pressure resisting ether ether ketone for the CT transmission scan; 250 ℃ of the high-temperature resistants of described clamper, the highest withstand voltage 12～13MPa of described clamper and hyperbaric chamber.
7. steam as claimed in claim 1 is transformed reservoir petrologic characteristic evaluation experimental device, and it is characterized in that: the first gas cylinder in described confined pressure control system is nitrogen cylinder.
8. steam transformation reservoir petrologic characteristic evaluation experimental device as claimed in claim 1, is characterized in that: described hyperbaric chamber, vaporium and the indoor temperature and pressure monitor that is respectively equipped with of steam monitoring.
9. one kind is utilized claim 1～8 any one experimental facilities to carry out the method that steam is transformed the reservoir petrologic characteristic evaluation experimental, said method comprising the steps of:
A, pipeline and model connect;
The tubular body of described clamper is erect and placed, and at the bottom of its bottom adopts internal thread and bottom, stifled external screw thread is tightly connected, and at the bottom of described bottom, blocks up and also adopts and be threaded with described sealed bottom plug; Block side and put a joint ring at the bottom of the bottom of described clamper, on sealing ring top, put a support ring, on this support ring top, put a grommet, place testing rock core at this above grommet; Place another grommet on described rock core top, place another support ring on this another grommet top, place another joint ring on this another support ring top, at the bottom of described clamper top is adopted to internal thread and top, stifled external screw thread is tightly connected and seals, and stifled at the bottom of described top and described top seal plug are adopted and be threaded and seal; The described clamper utilization connected is bolted to hyperbaric chamber inside, and closes hyperbaric chamber;
B, model vacuumize;
Utilize the vacuum pump of described pumped vacuum systems that vaporium, steam monitoring chamber and hyperbaric chamber are vacuumized;
C, steam injection;
Open steam generator, open the first one way valve, by respective line to steam injection in vaporium;
D, burden pressure are controlled;
Open the second gas cylinder, the second gas flow controller, the second gas boosting pump, the 4th one way valve, utilize the second gas boosting pump to monitor indoor nitrogen injection to steam, and utilize vaporium and steam to monitor indoor temperature and pressure monitor timely monitor vaporium and steam and monitor indoor pressure and change, the vaporium internal pressure is monitored room pressure a little more than steam, and both differences are no more than 0.5MPa;
E, confined pressure are controlled;
Open the first gas cylinder, the first gas flow controller, the first gas boosting pump, the 3rd one way valve, utilize described the first gas boosting pump to nitrogen injection in hyperbaric chamber, so that model is produced to confined pressure; Utilize confined pressure pressure in the temperature and pressure monitor timely monitor hyperbaric chamber in hyperbaric chamber, control confined pressure a little less than described steam monitoring chamber pressure, both differences are no more than 0.2Mpa;
F, extraction steam;
When steam monitoring room pressure is elevated to experiment test pressure, close the 4th one way valve of described upper-coated pressure system, open the second one way valve of described steam extraction system, by described back-pressure valve pressure setting, be experiment test pressure, continuation is by described steam injection system steam injection, control steam rate of withdrawal and pressure by back-pressure valve, to guarantee described vaporium internal pressure temperature constant simultaneously;
G, rock core top fluid analysis;
At set intervals, open the 8th one way valve of described fluid analytical systems, utilize described sampler from described steam monitoring chamber samples fluid, in observation condensation water collection bottle, whether have condensed water to occur, thereby judgement steam is broken through the time of rock core; In the time of every sub-sampling, open the 4th one way valve of described upper-coated pressure system, to the indoor supplementary nitrogen of described steam monitoring, with the pressure of the described steam monitoring of balance chamber;
H, rock core pore structure change scanning and analyze;
Utilize the industry CT of described IMAQ and analytical system to be scanned and imaging model, analyze under the high-temperature steam environment in good time, different temperature and pressure condition are to the reformation characteristics of rock core pore structure and the variation characteristic of steam corrosion interlayer rock.
10. steam as claimed in claim 9 is transformed reservoir petrologic characteristic evaluation experimental method, and it is characterized in that: in step G: sample frequency is: once/per hour～once/every day; For the accurate indoor condensed water that occurs of judgement steam monitoring, do not cause again that steam monitors indoor pressure oscillation simultaneously, the fluid volume of every sub-sampling is 0.1～0.2 liter.
11. steam as claimed in claim 9 transformation reservoir petrologic characteristic evaluation experimental method is characterized in that: in step H: scan frequency be 2～6 hours once.
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