CN103592319B - Be applicable to CT scan rock core displacement test and the heating constant-temperature system of energy simulating oil deposit condition - Google Patents

Be applicable to CT scan rock core displacement test and the heating constant-temperature system of energy simulating oil deposit condition Download PDF

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CN103592319B
CN103592319B CN201310503350.5A CN201310503350A CN103592319B CN 103592319 B CN103592319 B CN 103592319B CN 201310503350 A CN201310503350 A CN 201310503350A CN 103592319 B CN103592319 B CN 103592319B
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confined pressure
scan
rock core
temperature
heating constant
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CN103592319A (en
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吕伟峰
张祖波
刘庆杰
马德胜
吴康云
李彤
冷振鹏
罗蔓莉
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China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Abstract

The invention provides and be a kind ofly applicable to CT scan rock core displacement test and can the heating constant-temperature system of simulating oil deposit condition, it comprises: core holding unit and confined pressure space thereof; Container, has the space holding confined pressure liquid; Injection pump, connects described container; Heating constant-temperature equipment, is connected between the import in confined pressure space and described injection pump; Back pressure pipeline, between the outlet being connected to described confined pressure space and described container; Check valve, is arranged on described back pressure pipeline; Backpressure pump, connects described check valve; Heating constant-temperature equipment is positioned at outside rock core, is positioned at outside core holding unit, and is positioned at outside CT scan region.The present invention had both reached the effect of heated constant temperature and constant confining pressure, did not affect CT scan again, was suitable for the core test of CT scan, solved the technical matters providing high-temperature and high-pressure conditions in CT scan rock core displacement test.

Description

Be applicable to CT scan rock core displacement test and the heating constant-temperature system of energy simulating oil deposit condition
Technical field
The present invention relates to rock core displacement test, be specifically related to a kind ofly be applicable to CT scan rock core displacement test and can the heating constant-temperature system of simulating oil deposit condition.
Background technology
CT technology as measuring technology conventional in core analysis, be widely used in core description, the nonuniformity of rock core measure, core sample handling procedure is determined, crack quantitative test, online saturation degree the aspect such as measurement, flowing experiment research.Utilize CT scan technology, visual research can be carried out to rock core displacement process, the saturation degree obtaining rock core internal flow, along journey distributed intelligence, is understood oil recovery mechanism, monitoring fluid dispersion and channelling characteristic deeply, is familiar with polymer flooding and affects improving sweep area, announcement formation damage mechanism etc.
For rock core displacement test, often need Reality simulation reservoir condition, make data result more reliable, this realisticly will test and can carry out under the condition of constant temperature and high temperature.Due to the singularity of CT scan, the existence of the metallics (such as stainless steel) of any high atomic number all can cause the deviation of experimental result, therefore, baking oven cannot be used to carry out thermostatic control to experimental system, also resistance wire cannot be inserted in core holding unit and heat.
In sum, there is following problem in prior art: in the rock core displacement test of CT scan, rock core is difficult to reach the temperature of setting and keeps constant temperature.
Summary of the invention
The invention provides and be a kind ofly applicable to CT scan rock core displacement test and can the heating constant-temperature system of simulating oil deposit condition, to realize adding confined pressure and heated constant temperature simultaneously.
For this reason, the present invention proposes a kind ofly to be applicable to CT scan rock core displacement test and can the heating constant-temperature system of simulating oil deposit condition, comprising:
Core holding unit and confined pressure space thereof;
Be arranged on import and the outlet in the confined pressure space on core holding unit, import and outlet and the described confined pressure spatial joins in described confined pressure space;
Container, has the space holding confined pressure liquid;
Injection pump, connects described container by pipeline, makes the confined pressure liquid reaching design temperature be entered the import in the confined pressure space of core holding unit by constant speed, and flows out from the outlet in described confined pressure space;
Heating constant-temperature equipment, between the import being connected to described confined pressure space by pipeline and described injection pump;
Back pressure pipeline, between the outlet being connected to described confined pressure space and described container;
Check valve, be arranged on described back pressure pipeline, described check valve is positioned at the outlet in described confined pressure space, and the confined pressure controlling described core holding unit reaches the pressure of setting;
Backpressure pump, connects described check valve;
Described heating constant-temperature equipment is positioned at outside rock core, is positioned at outside described core holding unit, and is positioned at outside CT scan region.
Further, the confined pressure space wall of described core holding unit arranges one deck carbon fibre material, while guarantee CT scan effect, strengthens the resistance to gentle voltage endurance capability of described core holding unit.
Further, the coated insulation material of described back pressure pipeline.
Further, the confined pressure 13.2MPa of the confined pressure liquid of described set pressure.
Further, the temperature making rock core reach setting described in is 55 DEG C to 85 DEG C.
Further, be applicable to CT scan rock core displacement test described in and can the heating constant-temperature system of simulating oil deposit condition also comprise: confined pressure liquid, described confined pressure liquid-circulating is at heating arrangement, between confined pressure space and injection pump.
Further, described confined pressure liquid is water or oil.
Further, described rock core is reservoir rocks, and described heating constant-temperature equipment is water heater.
Further, described in be applicable to CT scan rock core displacement test and the heating constant-temperature system of simulating oil deposit condition also can comprise CT scanner, the CT scan region of CT scanner is positioned at outside described heating constant-temperature equipment.
Beneficial effect of the present invention is, the present invention, while guarantee constant confining pressure, realizes the circulation of core holding unit confined pressure thermostatted water or oil, makes rock core reach the temperature of setting and keep constant temperature.Because heating constant-temperature equipment is positioned at outside CT scan region, so, the structure of heating constant-temperature equipment and material can not affect CT scan effect, thus, the present invention had both reached the effect of heated constant temperature and constant confining pressure, do not affect CT scan again, be particularly suitable for the core test of CT scan, solve the technical matters that high-temperature and high-pressure conditions is provided in CT scan rock core displacement test.
Applicant also tested a kind of hydronic method of employing confined pressure liquid, because simulating oil deposit condition of formation pressure, confined pressure general comparatively large (more than 5MPa), must by the confined pressure liquid circulating-heating of high pressure, so be equipped with one group of high-pressure circulation pump, highly pressurised liquid is released and is heated to assigned temperature and notes into again, thus circulating-heating constant temperature.But adopt the hydronic method of confined pressure liquid to deposit also at some problems.Mainly because confined pressure hydraulic coupling is comparatively large, in order to keep the constant voltage of confined pressure liquid, the flow of circulation line needs to turn down or close, and rate of circulation can not be very fast, so just causes rock core to heat up very slow.From experiment, the confined pressure of 5MPa, is heated to 50 degrees Celsius by rock core from room temperature, needs the time more than 36 hours; The longer time causes thermal loss very large, and energy ezpenditure is also large; The temperature that this method can reach in addition more than 80 degrees Celsius, just can not be had no way of doing it during for needs reservoir temperature 90 even more than 100 degrees Celsius.
Although the present invention is also confined pressure liquid heated constant temperature, different with said method principle.Do not need many one group of high-pressure circulation pumps, only need can control confined pressure constant pressure with check valve, provide cost savings; Adopt constant speed simulated injection confined pressure liquid, can ensure the circulation of confined pressure liquid, outlet adds check valve, ensures the constant of confined pressure; By controlling confined pressure liquid injection rate, relative to the constant voltage injection mode of high-pressure circulation pump, can programming rate be improved, reducing thermal loss; Confined pressure liquid changes silicone oil (as methyl-silicone oil) into, and temperature can be made to be raised to more than 100 degrees Celsius; Owing to adopting type of heating of the present invention, clamper cylindrical shell decreases perforate, ensure that withstand voltage and heat insulation effect, and clamper inwall adds carbon fibre material, also strengthens the withstand voltage and heat insulation effect of clamper.
From 1MPa to 30MPa not etc., such as, be 5MPa or more than 5MPa, the confined pressure pressure of concrete setting is depending on oil reservoir physical condition for the present invention's confined pressure pressure used.
Owing to adopting constant speed to inject, instead of constant voltage injection mode, the flow velocity injecting confined pressure liquid improves by injection pump, can reduce the heat exchanger time of confined pressure liquid and ambient temperature, thus reduces thermal loss.
Rock core is heated to 50 degrees Celsius from room temperature by the present invention, more than 1 hour, rock core can not be heated to 85 degrees Celsius from room temperature, can not more than 1.5 hours.
Accompanying drawing explanation
Fig. 1 is the structural representation being applicable to the heating constant-temperature system of CT scan of the embodiment of the present invention.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
The present invention proposes a kind of heated constant temperature method being applicable to CT scan, described in be applicable to CT scan heated constant temperature method comprise:
As shown in Figure 1, the confined pressure liquid reaching set pressure is heated to design temperature among heating constant-temperature equipment 5;
Make the confined pressure liquid reaching design temperature be entered the import 4 in the confined pressure space of core holding unit by injection pump constant speed, and flow out from the outlet 8 in described confined pressure space; The outlet in described confined pressure space is provided with a check valve 10, and the confined pressure controlling described core holding unit reaches the pressure of setting; Namely, while injection pump injects confined pressure liquid to the confined pressure space constant speed of core holding unit, check valve is provided to keep the constant of the confined pressure fluid pressure in confined pressure space;
The confined pressure liquid flowed out from the outlet in described confined pressure space, after heating constant-temperature equipment 5 heats, is formed with the confined pressure liquid of the import entering described confined pressure space and circulates;
The confined pressure liquid in described confined pressure space makes rock core 3 reach the temperature of setting and keep constant temperature by heat transfer;
Described heating constant-temperature equipment 5 is positioned at outside rock core, is positioned at outside described core holding unit 1, and is positioned at outside CT scan region.
The present invention by carrying out hydronic mode outside core holding unit 1, rock core 3 is made to reach the temperature of setting and keep constant temperature, thus overcome problem well heater or heater strip heating being set in core holding unit and can impacting CT scan, in addition, type of heating of the present invention or heat exchange pattern more more stable than original direct-fired mode, temperature fluctuation is less, and intensification cooling rate is faster, the efficiency of heating surface is high, high insulating effect.The present invention does not need many one group of high-pressure circulation pumps, provides cost savings (can solve with check valve); Adopt constant speed simulated injection confined pressure liquid, can ensure the circulation of confined pressure liquid, outlet adds check valve, ensures the constant of confined pressure; By controlling confined pressure liquid injection rate, can programming rate be improved, reducing thermal loss; Confined pressure liquid changes oil into, and temperature can be made to be raised to more than 100 degrees Celsius; Clamper cylindrical shell reduces perforate, and clamper inwall adds carbon fibre material, and enhancing clamper is withstand voltage and heat insulation effect.
Further, the heated constant temperature method being applicable to CT scan described in also comprises: described rock core reaches the temperature of setting and after keeping constant temperature, carries out CT scan.
The described heated constant temperature method being applicable to CT scan adopt as shown in Figure 1 be applicable to CT scan rock core displacement test and can the heating constant-temperature system of simulating oil deposit condition, described in be applicable to CT scan rock core displacement test and can the heating constant-temperature system of simulating oil deposit condition comprise:
Core holding unit 1 and confined pressure space 2 thereof; The confined pressure space wall of core holding unit can arrange one deck carbon fibre material, this kind of material can make X ray pass, ensure CT scan effect, the resistance to gentle voltage endurance capability that can strengthen clamper is in addition arranged on import 4 and the outlet 8 in the confined pressure space on core holding unit, and the import 4 in described confined pressure space is connected with described confined pressure space 2 with outlet 8;
Container 7, has the space holding confined pressure liquid;
Injection pump 6, connects described container 7 by pipeline, for confined pressure space 2 constant speed of core holding unit 1 injects confined pressure liquid;
Heating constant-temperature equipment 5, is heated to design temperature by the water or confined pressure liquid that enter into heating constant-temperature equipment 5; Between the import 4 that heating constant-temperature equipment 5 is connected to described confined pressure space by pipeline and described injection pump 6; Described heating constant-temperature equipment such as comprises: heating kettle and be arranged on heating rod in heating kettle, and heating rod is connected with relay, and such as, heating constant-temperature equipment 5 can be water heater, or the well heater of approximate gas heater or gas heater.
Back pressure pipeline, between the outlet 8 being connected to described confined pressure space and described container 7; Back pressure pipeline can be coated with insulation material, realize insulation;
Check valve 10, be arranged on described back pressure pipeline, described check valve is positioned at the outlet in described confined pressure space, and the confined pressure controlling described core holding unit reaches the pressure of setting; ; Namely, while injection pump injects confined pressure liquid to the confined pressure space constant speed of core holding unit, the constant of the confined pressure fluid pressure in confined pressure space is kept by check valve;
Backpressure pump 9, connects described check valve 10.
After injection pump 6 draws confined pressure liquid (water or oil) from container 7, with in certain flow velocity constant speed injection heating thermostat 5.Confined pressure liquid by heating constant-temperature equipment 5, heating constant temperature to design temperature, then by the hole of import 4(core holding unit lower end) enter the confined pressure space 2 of core holding unit 1.The confined pressure liquid of circulation flows out from the hole 8 of core holding unit 1 upper end, enters check valve 10.The confined pressure liquid flowed out from check valve 10 loops back container 7 again.By the pressure that backpressure pump 9 sets, keep the confined pressure that core holding unit is constant.After a period of stabilisation, the temperature of rock core 3 is consistent with the temperature that heating constant-temperature equipment 5 sets.
Further, be applicable to CT scan rock core displacement test described in and can the heating constant-temperature system of simulating oil deposit condition also comprise: confined pressure liquid, described confined pressure liquid-circulating is at heating arrangement, between confined pressure space and injection pump.The circulating-heating mode of confined pressure liquid ensure that core temperature of the present invention.Described confined pressure liquid is water or oil.The confined pressure 13.2MPa of the confined pressure liquid of described set pressure.Further, described in make rock core reach setting temperature be 55 DEG C to 85 DEG C so that simulated formation pressure and temperature.
Further, described in be applicable to CT scan rock core displacement test and the heating constant-temperature system of simulating oil deposit condition also can comprise CT scanner, described rock core reaches the temperature of setting and keeps constant temperature after 24 hours, carries out CT scan.Like this, rock core fully can reach the temperature of setting if having time.
Further, the heated constant temperature method being applicable to CT scan described in comprises further:
A: be placed in core holding unit after rock core is dried, add confined pressure to 13.2MPa, heating core temperature to 55 DEG C constant temperature 24 hours;
B: after dry rock core CT scan, finds time saturated 24 hours with local water, then scans with the rock core of CT scanner to complete saturated local water;
C: utilize in-place oil to drive local water and make irreducible water;
D: utilize local water displace crude oil, in displacement process, interval CT scans at regular intervals, to no longer fuel-displaced, terminates CT scan.Then utilize CT scan data to calculate the saturation distribution of each moment rock core along journey, thus under measuring reservoir condition, the saturation degree of rock core water drive process distribute along journey.Wherein, confined pressure pump is ISO pump, and backpressure pump is DBPR-5 high accuracy number type back pressure system, and injection pump is QUIZIX5200 pump, and CT scanner is GELightSpeed8CT scanner.
Further, described rock core is reservoir rocks, Crude viscosity 11.8cp, reservoir water salinity 19867, with simulated formation actual conditions.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.For each ingredient of the present invention can mutually combine under the condition of not conflicting, any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.

Claims (8)

1. be applicable to CT scan rock core displacement test and can the heating constant-temperature system of simulating oil deposit condition, it is characterized in that, described in be applicable to CT scan rock core displacement test and can the heating constant-temperature system of simulating oil deposit condition comprise:
Core holding unit and confined pressure space thereof;
Be arranged on import and the outlet in the confined pressure space on core holding unit, import and outlet and the described confined pressure spatial joins in described confined pressure space;
Container, has the space holding confined pressure liquid;
Injection pump, connects described container by pipeline, and injection pump makes the confined pressure liquid reaching design temperature be entered the import in the confined pressure space of core holding unit by constant speed, and flows out from the outlet in described confined pressure space;
Heating constant-temperature equipment, between the import being connected to described confined pressure space by pipeline and described injection pump;
Back pressure pipeline, between the outlet being connected to described confined pressure space and described container;
Check valve, be arranged on described back pressure pipeline, described check valve is positioned at the outlet in described confined pressure space, and the confined pressure controlling described core holding unit reaches the pressure of setting; The confined pressure 13.2MPa of the confined pressure liquid of described set pressure;
Backpressure pump, connects described check valve;
Described heating constant-temperature equipment is positioned at outside rock core, is positioned at outside described core holding unit, and is positioned at outside CT scan region.
2. be applicable to CT scan rock core displacement test as claimed in claim 1 and the heating constant-temperature system of energy simulating oil deposit condition, it is characterized in that, the confined pressure space wall of described core holding unit arranges one deck carbon fibre material, while guarantee CT scan effect, strengthen the resistance to gentle voltage endurance capability of described core holding unit.
3. be applicable to CT scan rock core displacement test as claimed in claim 1 and the heating constant-temperature system of energy simulating oil deposit condition, it is characterized in that, the coated insulation material of described back pressure pipeline.
4. be applicable to CT scan rock core displacement test as claimed in claim 1 and can the heating constant-temperature system of simulating oil deposit condition, it is characterized in that, described in make rock core reach setting temperature be 55 DEG C to 85 DEG C.
5. be applicable to CT scan rock core displacement test as claimed in claim 1 and the heating constant-temperature system of energy simulating oil deposit condition, it is characterized in that, describedly be applicable to CT scan rock core displacement test and can the heating constant-temperature system of simulating oil deposit condition also comprise: confined pressure liquid, described confined pressure liquid-circulating is at heating arrangement, between confined pressure space and injection pump.
6. be applicable to CT scan rock core displacement test as claimed in claim 5 and the heating constant-temperature system of energy simulating oil deposit condition, it is characterized in that, described confined pressure liquid is water or oil.
7. be applicable to CT scan rock core displacement test as claimed in claim 1 and the heating constant-temperature system of energy simulating oil deposit condition, it is characterized in that, described rock core is reservoir rocks, and described heating constant-temperature equipment is water heater.
8. be applicable to CT scan rock core displacement test as claimed in claim 1 and the heating constant-temperature system of energy simulating oil deposit condition, it is characterized in that, describedly be applicable to CT scan rock core displacement test and the heating constant-temperature system of simulating oil deposit condition also can comprise CT scanner, the CT scan region of CT scanner is positioned at outside described heating constant-temperature equipment.
CN201310503350.5A 2013-10-23 2013-10-23 Be applicable to CT scan rock core displacement test and the heating constant-temperature system of energy simulating oil deposit condition Active CN103592319B (en)

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