CN103278516B - Based on the rock core CT scan method of plan vertical gas injection - Google Patents

Based on the rock core CT scan method of plan vertical gas injection Download PDF

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CN103278516B
CN103278516B CN201310181935.XA CN201310181935A CN103278516B CN 103278516 B CN103278516 B CN 103278516B CN 201310181935 A CN201310181935 A CN 201310181935A CN 103278516 B CN103278516 B CN 103278516B
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rock core
core
scan
end support
scan method
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CN103278516A (en
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李彤
吕伟峰
刘庆杰
马德胜
冷振鹏
严守国
张祖波
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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 discloses a kind of rock core CT scan method based on plan vertical gas injection, core holding unit for CT scan can be adjusted to any direction between horizontal and vertical and fix, in injection gas displacement process, core holding unit is in plumbness, when carrying out CT scan, core holding unit is placed in horizontality.Method of the present invention, by introducing rotary system, may be used for the impact at Study In Reservoir inclination angle, mates existing CT scanner to greatest extent and carries out plan vertical gas injection experiment.

Description

Based on the rock core CT scan method of plan vertical gas injection
Technical field
The present invention relates to a kind of simulation oil field and close note Mining Test method, be specifically related to a kind of rock core CT scan method based on plan vertical gas injection.
Background technology
CT technical development is very fast, 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.By carrying out physical properties of rock quantitatively and image analysis, pore texture, nonuniformity, the remaining oil distribution characterizing rock directly perceived; Visual research is carried out to displacement process, understands oil recovery mechanism, monitoring fluid dispersion and channelling characteristic deeply, be familiar with polymer flooding and affect improving sweep area, announcement formation damage mechanism etc.Utilize CT technology can obtain the saturation degree of rock core internal flow along journey distributed intelligence, utilize the fluid saturation distributed intelligence that CT technology more can obtain in each layer intuitively, and the channelling phenomenon because Action of Gravity Field causes can be studied further.
After waterflooding enters the High water cut stage, a large amount of remaining oils is still had extraction to come.Adopt existing raising recovery ratio method often to exist poor for applicability, improve recovery ratio limited extent, the problems such as high expensive.Abroad, plan vertical gas injection has developed into a kind of low cost, efficiently oil recovery technique, and the pattern usually taking top straight well gas injection bottom water horizontal well to recover the oil at the scene in practical application is exploited, and exploitation effect is very good.Grasp plan vertical air insufflation techiques and improve the basis that recovery mechanism is the application of this Technique Popularizing and optimal design.Meanwhile, in practical application link, the deep understanding of recovery mechanism is improved to this technology and also contributes to that east China original oil zone utilizes this technological adjustment development stimulation, suggestions for improvement has certain directive significance.
At present about the research of plan vertical gas injection; the large-scale thing mould of many employings full-hole core or sand-filling tube model carry out experimental study; the starting point of problem analysis mainly by the pressure of monitoring experiment overall process and occurrence research injection rate on the impact of final effect; seldom have experiment from the distribution of Oil, Water, Gas three, migration and various factors on its angle affected to study the mechanism of this technology, the experimental design thinking about this respect is also little.
The present invention is based on existing CT scan monitoring fluid saturation technology, realize oil, gas, the distribution of water three, migration in the experiment of monitoring crestal gas injection by design specialized clamper.
Summary of the invention
The object of this invention is to provide a kind of CT scan method, the method can vertically gas injection be tested and carry out horizontal scanning, in realizing utilizing CT scan technical Analysis to test, Oil, Water, Gas three distributes migration rule and many factors to its impact, dissects plan vertical air insufflation techiques improve recovery mechanism from the angle compared with microcosmic.
For achieving the above object, technical scheme of the present invention is as follows:
The present invention relates to a kind of rock core CT scan method based on plan vertical gas injection, the device of use comprise CT scan system, displacement system, cover pressing system, pressure-measuring system, for the heterogeneous multi-layer core holding unit of CT scan and metering system; Wherein this core holding unit being used for CT scan comprises polyether-ether-ketone resin shell 8, rubber tube 9, rock core top end 10, comes directly towards 6, core model 7, inlet 11, liquid outlet 5, base 2, lower end support 3, upper end support 4 and vertical support frame 12 under rock core; Polyether-ether-ketone resin shell 8 is connected with base with upper end support 4 by lower end support 3, wherein, one end of described shell is connected with lower end support, and can rotate around lower end support 3, described shell can turn to horizontality, and the other end of described shell can be supported on described upper end support 4, one end of vertical support frame 12 can rotate and be connected with described base, the other end and polyether-ether-ketone resin shell 8 are fixed by removably, and polyether-ether-ketone resin shell 8 can be adjusted to any direction between horizontal and vertical and fix by it; It is characterized in that in injection gas displacement process, core holding unit is in plumbness, is placed in horizontality when carrying out CT scan by core holding unit.
In a preferred embodiment of the present invention, described core holding unit is provided with plumb line use level hornwork on polyether-ether-ketone resin shell 8, for measuring the angle of inclination of core holding unit.
In another preferred embodiment of the present invention, under this rock core, top arranges multiple liquid outlet, rock core liquid outlet is communicated with rock core room and metering system, and each liquid outlet aims at one deck core model respectively.
As above based on the rock core CT scan scan method of plan vertical gas injection, wherein, this rubber tube 9 outside is preferably cube or cylinder, and inside has cube cavity to hold cube rock core or cylindrical cavity to hold right cylinder rock core, and its two ends have circular interface.
In another preferred embodiment of the present invention, described lower end support is connected with polyether-ether-ketone resin shell 8 by rotating shaft 31, and this rotating shaft 31 is less than 1/2 of clamper length apart from the distance of base 2, is preferably less than 1/3.
Beneficial effect of the present invention is, the first, and in CT scan process, metal material is very strong to the absorption of X ray, this will cause ray to be difficult to penetrate rock core, thus causing serious measuring error, the design adopts peek material to make clamper cylindrical shell, reduces the impact of this respect well.The second, the clamper of existing vertical gas injection rock core CT scan system is too high, enters scanning area difficulty, and scan slice thickness increases, and produces ray hardened meeting and causes very large measuring error.The introducing of rotary system overcomes the inconvenience of CT scan in experimentation well, and meanwhile, the introducing of rotary system also with the impact at Study In Reservoir inclination angle, can be mated existing CT scanner and carry out plan vertical gas injection experiment to greatest extent.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is the structural representation of CT scan system of the present invention when scanning sample introduction;
Fig. 2 is the structural representation of core holding unit of the present invention when displacement test;
Fig. 3 is the structural representation of core holding unit;
Fig. 4 is core holding unit is 45 ° of laying state structural representations;
Fig. 5 is the skeleton view of lower end support.
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 vertical stable displacement experiment of embodiment 1 crestal gas injection
First by the rock core water saturation that water drive is extremely required in clamper, then carry out crestal gas injection in inlet end gas injection and vertically stablize the displacement of reservoir oil, and at endpiece, production fluid is measured, until reach experiment purpose, now the polyether-ether-ketone resin shell 8 of clamper is in vertical position and fixing by vertical support frame 12.
In process, timing CT scan carries out the saturation degree delta data in gatherer process.
During each scanning, first vertical support frame 12 and polyether-ether-ketone resin shell 8 are untied, and vertical support frame is turned to lies on base, the clamper vertically put is transferred to level in the situation not changing other state and is fixed by lower end support 3 and upper end support 4, then scan in CT scan region, then again clamper is held up to vertical and fixed by vertical support frame 12, present scan process terminates, and carries out CT scan gravity can be avoided for the impact of the inside result of every one deck by scanning system of the present invention.
The CT scan multilayer non-homogeneous model experimental system that embodiment 2 is simulated for formation condition
As shown in Figure 1, multilayer non-homogeneous model pilot system comprises CT scan system 1, displacement system, covers pressing system, pressure-measuring system, metering system (detailed description of above-mentioned parts is with reference to Chinese patent CN102095740B, authorized announcement date 2012.08.08) and core holding unit.
CT scan system (1) can use conventional Medical CT scanning system, such as GE Light Speed 8 multi-layer helical scanning system, minimum Scan slice thickness 0.625mm, maximum scan voltage 140kV, and the degree of accuracy measuring saturation degree is 1%.
Displacement system is made up of two high-pressure metering pumps, can carry two kinds of fluids simultaneously, is the power source of displacement.Flow rates: 0.001-15ml/min, maximum pressure: 10000psi (68.94MPa).
Cover pressing system to be made up of pump, such as JB-800 pump group, for adding confined pressure to core holding unit and rock core, simulation burden pressure.Maximum confined pressure 70MPa.
Pressure-measuring system is made up of multiple pressure transducer, and two high-pressure pressure sensor ranges are 70MPa, are connected with displacement pump, and also have three low-pressure sensor in addition, for measuring fluid mouth pressure, range is respectively 0.05MPa, 0.5MPa, 5MPa.Precision is 0.25%.
Cumulative oil production when water breakthrough time of metering system record every layer, water breakthrough and cumulative liquid production.
Wherein, core holding unit is the custom-designed core holding unit 100 for CT scan of pilot system of the present invention, please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, it comprises polyether-ether-ketone resin shell 8, rubber tube 9, rock core top end 10,6 are come directly towards under rock core, core model 7, inlet 11, liquid outlet 5, base 2, lower end support 3, upper end support 4 and vertical support frame 12, polyether-ether-ketone resin shell 8 is connected with base with upper end support 4 by lower end support 3, wherein, one end of shell 8 is connected with lower end support 3 by rotating shaft 31, and can be rotated around lower end support 3 by this rotating shaft, when shell 8 turns to horizontality, the other end of shell 8 can be supported on described upper end support 4, upper end support 4 with polyether-ether-ketone resin shell 8 for contact is connected (as shown in Figure 2), one end of vertical support frame 12 can rotate and be connected with base 2, the other end can be fixed by removably with polyether-ether-ketone resin shell 8, polyether-ether-ketone resin shell 8 can be adjusted to any direction between horizontal and vertical and fix by it.Concrete angle of inclination can be measured by the plumb line 14 use level hornwork 13 be fixed on polyether-ether-ketone resin shell 8.Clamper shown in Fig. 4 is 45 ° of laying states is a specific embodiment.
Wherein, under rock core, top arranges multiple liquid outlet, rock core liquid outlet is communicated with rock core room and metering system, and each liquid outlet 5 aims at one deck core model respectively.
In addition, in the present invention, rubber tube 9 outside is cube or cylinder, and inside has cube cavity to hold cube rock core, or the inside of this rubber tube 9 forms cylindrical cavity to hold right cylinder rock core, and its two ends have circular interface.
In a feasible embodiment, described core model is single or multiple lift rock core.Wherein, individual layer rock core is cylindrical or cube.
A concrete technical scheme is that the rotating shaft 31 of lower end support 3 is less than 1/2 of clamper length apart from the distance of base 2, is preferably less than 1/3, thus effectively can reduce scanning area and scanning bed distance, improves versatility and the adaptability of scanning device.
Upper end support 4 of the present invention and lower end support 3 are made by rigid material.
In addition, vertical support frame 12 is with the connected mode of shell 8 or to adopt conventional structure, as passed through to arrange draw-in groove on shell 8, or web member is set on shell 8 by the connection such as pin, bolt, as long as by the support of vertical support frame 12, make shell 8 remain on the upright of regulation or angle of inclination is just passable, its concrete structure is not limited.Further, one end of this vertical support frame 12 can also be connected with upper end support 4 rotationally, as shown in Figure 4.
Please refer to Fig. 5, in a specific embodiment, lower end support 3 has the rack body 30 that can be fixedly connected with base 2, the clip 32 that can be fixedly connected with one end of shell 8, described clip 32 is connected by rotating shaft 31 with between rack body 30, thus shell 8 can be rotated relative to lower end support 3 by this rotating shaft 31.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, the 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.And it should be noted that, each ingredient of the present invention is not limited in above-mentioned overall applicability, the each technical characteristic described in instructions of the present invention can select one to adopt separately or select the multinomial use that combines according to actual needs, therefore, the present invention covers other relevant with this case inventive point in the nature of things and combines and embody rule.

Claims (8)

1. based on a rock core CT scan method for plan vertical gas injection, the device of use comprises CT scan system, displacement system, covers pressing system, pressure-measuring system, for the heterogeneous multi-layer core holding unit of CT scan and metering system, wherein this core holding unit being used for CT scan comprises polyether-ether-ketone resin shell (8), rubber tube (9), rock core top end (10), (6) are come directly towards under rock core, core model (7), inlet (11), liquid outlet (5), base (2), lower end support (3), upper end support (4) and vertical support frame (12), polyether-ether-ketone resin shell (8) is connected with base with upper end support (4) by lower end support (3), wherein, one end of described shell is connected with lower end support (3), and can rotate around lower end support (3), described shell can turn to horizontality, and the other end of described shell can be supported on described upper end support (4), one end of vertical support frame (12) can rotate and be connected with described base, the other end and polyether-ether-ketone resin shell (8) are fixed by removably, polyether-ether-ketone resin shell (8) can be adjusted to any direction between horizontal and vertical and fix by it, it is characterized in that in injection gas displacement process, core holding unit is in plumbness or substantially vertical state, is placed in horizontality when carrying out CT scan by core holding unit, described lower end support (3) is connected with polyether-ether-ketone resin shell (8) by rotating shaft (31), and the distance of this rotating shaft (31) distance base (2) is less than 1/2 of clamper length.
2. rock core CT scan method according to claim 1, is characterized in that, described core holding unit is provided with plumb line use level hornwork on polyether-ether-ketone resin shell (8).
3. rock core CT scan method according to claim 1, is characterized in that, under this rock core, top arranges multiple liquid outlet, and rock core liquid outlet is communicated with rock core room and metering system, and each liquid outlet (5) aims at one deck core model respectively.
4. rock core CT scan method according to claim 1, it is characterized in that, this rubber tube (9) outside is cube or cylinder, and inside has cube cavity to hold cube rock core or cylindrical cavity to hold right cylinder rock core, and its two ends have circular interface.
5. rock core CT scan method according to claim 1, is characterized in that, described core model is single or multiple lift rock core.
6. rock core CT scan method according to claim 5, is characterized in that, described individual layer rock core is cylindrical or cube.
7. rock core CT scan method according to claim 1, is characterized in that, the distance of described rotating shaft (31) distance base (2) is less than 1/3 of clamper length.
8. rock core CT scan method according to claim 1, is characterized in that, described upper end support (4) and lower end support (3) are rigid material.
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CN103592319B (en) * 2013-10-23 2015-12-02 中国石油天然气股份有限公司 Be applicable to CT scan rock core displacement test and the heating constant-temperature system of energy simulating oil deposit condition
CN103592320B (en) * 2013-10-23 2015-11-18 中国石油天然气股份有限公司 Be applicable to CT scan rock core displacement test and the heated constant temperature method of energy simulating oil deposit condition
CN103868801B (en) * 2014-02-26 2016-04-06 中国石油天然气股份有限公司 The evaluating apparatus of performances of rock
CN104374682B (en) * 2014-11-12 2017-05-10 中国石油天然气股份有限公司 Rock core CT (Computed Tomography) scanning analysis method and device
CN105890975A (en) * 2016-06-19 2016-08-24 中国科学院寒区旱区环境与工程研究所 Supporting frame of triaxial frozen earth loading device for medical CT (computed tomography)
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