CN103278516A - Rock core CT (Computed Tomography) scanning method based on vertical gas injection at top - Google Patents

Rock core CT (Computed Tomography) scanning method based on vertical gas injection at top Download PDF

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Publication number
CN103278516A
CN103278516A CN201310181935XA CN201310181935A CN103278516A CN 103278516 A CN103278516 A CN 103278516A CN 201310181935X A CN201310181935X A CN 201310181935XA CN 201310181935 A CN201310181935 A CN 201310181935A CN 103278516 A CN103278516 A CN 103278516A
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rock core
end support
core
scan
polyether
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CN201310181935XA
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CN103278516B (en
Inventor
李彤
吕伟峰
刘庆杰
马德胜
冷振鹏
严守国
张祖波
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Petrochina Co Ltd
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 rock core CT (Computed Tomography) scanning method based on vertical gas injection at the top. A rock core gripper used for CT scanning can be adjusted to be in any direction between the horizontal direction and the vertical direction and fixedly arranged, and is in a vertical state in the gas injection and oil displacement processes and in a horizontal state in the CT scanning. As a rotary system is led in, the rock core CT scanning method provided by the invention can be used for researching the effect of a reservoir dip angle, and matched with a conventional CT scanner to the maximum extent to carry out vertical gas injection experiments at the top.

Description

Rock core CT scan method based on the vertical gas injection in top
Technical field
The present invention relates to a kind of simulation oil field and close notes Mining Test method, be specifically related to a kind of rock core CT scan method based on the vertical gas injection in top.
Background technology
The CT technical development is very fast, as measuring technology conventional in the core analysis, aspects such as the nonuniformity that is widely used in core description, rock core is measured, the core sample handling procedure is determined, the measurement of crack quantitative test, online saturation degree, flowing experiment research.By physical properties of rock being carried out quantitatively and image analysis, intuitively characterize pore texture, nonuniformity, the remaining oil distribution of rock; Displacement process is carried out visual research, understand oil recovery mechanism, the dispersion of monitoring fluid and channelling characteristic, understanding polymer flooding deeply to improving the sweep area influence, announcement formation damage mechanism etc.Utilize saturation degree that the CT technology can obtain the rock core internal flow along the journey distributed intelligence, utilize the CT technology more can obtain fluid saturation distributed intelligence in each layer intuitively, and can further study because the channelling phenomenon that the gravity effect causes.
After waterflooding enters high water-cut stage, still have a large amount of remaining oils extraction to come.Problems such as it is poor for applicability to adopt existing raising recovery ratio method often to exist, and it is limited to improve the recovery ratio amplitude, and cost is higher.Abroad, the vertical gas injection in top has developed into a kind of low cost, oil recovery technique efficiently, the pattern exploitation of taking top straight well gas injection bottom water horizontal well to recover the oil at the scene in the practical application usually, and exploitation effect is very good.Grasping the vertical gas injection technology in top, to improve recovery ratio mechanism be that this technology is applied and the basis of optimal design.Simultaneously, in the practical application link, the deep understanding that this technology is improved recovery ratio mechanism also helps the east China original oil zone to utilize this technological adjustment exploitation measure, improve development effectiveness has certain directive significance.
Present research about the vertical gas injection in top; adopt the research that experimentizes of the large-scale thing moulds of full-hole core or fill out sand tube model more; the starting point of problem analysis mainly is to study injection rate to the influence of final effect by the pressure of monitoring experiment overall process and occurrence; seldom there is experiment from Oil, Water, Gas three's distribution, migration and various factors the angle of its influence to be studied the mechanism of this technology, about the experimental design thinking of this respect also seldom.
The present invention is based on existing C T scanning monitoring fluid saturation technology, realize oil, gas, water three's distribution, migration in the experiment of monitoring crestal gas injection by the design specialized clamper.
Summary of the invention
The purpose of this invention is to provide a kind of CT scan method, the vertically gas injection experiment and carry out horizontal scanning of this method, realization utilizes in the CT scan technical Analysis experiment Oil, Water, Gas three to distribute migration rule and multiple factor to its influence, improves recovery ratio mechanism from the vertical gas injection technology in angle analysis top than 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 the vertical gas injection in top, the device of use comprises CT scan system, displacement system, covers pressing system, pressure-measuring system, be used for heterogeneous body multiple-lay core gripper and the metering system of CT scan; Wherein this core holding unit that is used for CT scan be to comprise polyether-ether-ketone resin shell 8, and rubber tube 9 comes directly towards 6 under the rock core top end 10, rock core, rock core model 7, inlet 11, liquid outlet 5, base 2, following end support 3, last end support 4 and vertical support frame 12; Following end support 3 links to each other polyether-ether-ketone resin shell 8 with last end support 4 with base, wherein, one end of described shell is connected with following end support, and can be around end support 3 rotations down, described shell can turn to horizontality, and the other end of described shell can be supported on described going up on the 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, its polyether-ether-ketone resin shell 8 can be adjusted to level and vertical between any direction and fixing; It is characterized in that core holding unit is in plumbness in the injection gas displacement process, when carrying out CT scan, core holding unit is placed horizontality.
In a preferred embodiment of the present invention, described core holding unit is provided with plumb line use level hornwork at polyether-ether-ketone resin shell 8, is used for the angle of inclination of core holding unit is measured.
In another preferred embodiment of the present invention, on the top a plurality of liquid outlets are set under this rock core, the rock core liquid outlet is communicated with rock core room and metering system, and each liquid outlet is aimed at one deck rock core model respectively.
Aforesaid rock core CT scan scan method based on the vertical gas injection in top, wherein, these rubber tube 9 outsides are preferably cube or cylinder, and inside has the cube cavity to hold cube rock core or cylindrical cavity to hold the right cylinder rock core, and its two ends have circular interface.
In another preferred embodiment of the present invention, described down end support is connected with polyether-ether-ketone resin shell 8 by rotating shaft 31, this rotating shaft 31 apart from the distance of base 2 less than 1/2 of clamper length, preferably less than 1/3.
Beneficial effect of the present invention is, the first, and metal material is very strong to the absorption of X ray in the CT scan process, this will cause ray to be difficult to penetrate rock core, thereby cause serious measuring error, the design adopts the peek material to make the clamper cylindrical shell, has reduced the influence of this respect well.The second, the clamper of existing vertical gas injection rock core CT scan system is too high, enter the scanning area difficulty, and scan slice thickness increases, and produces ray hardened meeting and causes very big measuring error.The introducing of rotary system has overcome the inconvenience of CT scan in the experimentation well, and simultaneously, the introducing of rotary system also can be mated existing CT scanner and carry out the vertical gas injection experiment in top to greatest extent with the influence at research reservoir inclination angle.
Description of drawings
The following drawings only is intended to the present invention done and schematically illustrates 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 the 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 45 ° of laying state structural representations for core holding unit;
Fig. 5 is the lower end perspective views of supports according.
Embodiment
Understand for technical characterictic of the present invention, purpose and effect being had more clearly, now contrast description of drawings the specific embodiment of the present invention.
The vertical stable displacement experiment of embodiment 1 crestal gas injection
Earlier with rock core in clamper water drive to needed water saturation, carry out crestal gas injection in the inlet end gas injection then and vertically stablize the displacement of reservoir oil, and at endpiece output liquid is measured, until reaching experiment purpose, the polyether-ether-ketone resin shell 8 of clamper was in vertical position and fixed by vertical support frame 12 this moment.
Regularly carry out saturation degree delta data in the gatherer process with CT scan in the process.
During each scanning, earlier vertical support frame 12 and polyether-ether-ketone resin shell 8 are untied, and vertical support frame is turned to lies on the base, the clamper of vertically putting is transferred to level and by end support 3 and last end support 4 are fixing down in the situation that does not change other state, scan in the CT scan zone then, then again clamper is held up to vertical and fixing by vertical support frame 12, this scanning process finishes, and carries out CT scan by scanning system of the present invention and can avoid gravity for the inside result's of each layer influence.
Embodiment 2 is at the CT scan multilayer non-homogeneous model experimental system of formation condition simulation
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 with reference to Chinese patent CN102095740B, Granted publication day 2012.08.08) and core holding unit.
CT scan system (1) can use conventional Medical CT scanning system, GE Light Speed 8 multi-layer helical scanning systems for example, and minimum scanning bed thickness 0.625mm, maximum scan voltage 140kV, the degree of accuracy of measuring saturation degree is 1%.
The 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 and be made up of pump, for example JB-800 pump group is used for adding confined pressure to core holding unit and rock core, the simulation burden pressure.Maximum confined pressure 70MPa.
Pressure-measuring system is made up of a plurality of pressure transducers, and two high-pressure transducer ranges are 70MPa, links to each other with the displacement pump, also has three low-pressure sensor in addition, is used for measuring the fluid mouth pressure, and range is respectively 0.05MPa, 0.5MPa, 5MPa.Precision is 0.25%.
Cumulative oil production and cumulative liquid production when the water breakthrough time that the metering system record is every layer, water breakthrough.
Wherein, core holding unit is to be 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, come directly towards 6 under the rock core, rock core model 7, inlet 11, liquid outlet 5, base 2, time end support 3, last end support 4 and vertical support frame 12; Following end support 3 links to each other polyether-ether-ketone resin shell 8 with last end support 4 with base, wherein, one end of shell 8 is connected with following end support 3 by rotating shaft 31, and can be by this rotating shaft around end support 3 rotations down, when shell 8 turns to horizontality, the other end of shell 8 can be supported on the described end support 4 of going up, last end support 4 is connected (as shown in Figure 2) with polyether-ether-ketone resin shell 8 for contact, 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, its polyether-ether-ketone resin shell 8 can be adjusted to level and vertical between any direction and fixing.Concrete angle of inclination can be measured by the plumb line 14 use level hornworks 13 that are fixed on the polyether-ether-ketone resin shell 8.It is a specific embodiment that clamper shown in Figure 4 is 45 ° of laying states.
Wherein, on the top a plurality of liquid outlets are set under the rock core, the rock core liquid outlet is communicated with rock core room and metering system, and each liquid outlet 5 is aimed at one deck rock core model respectively.
In addition, rubber tube 9 outsides are cube or cylinder among the present invention, and inside has the cube cavity holding the cube rock core, or the inside of this rubber tube 9 forms cylindrical cavity to hold the right cylinder rock core, and its two ends have circular interface.
Among the feasible embodiment, described rock core model is the single or multiple lift rock core.Wherein, the individual layer rock core is cylindrical or cube.
A concrete technical scheme is, the rotating shaft 31 of following end support 3 less than 1/2 of clamper length, preferably less than 1/3, thereby can reduce scanning area and scanning bed distance apart from the distance of base 2 effectively, improves versatility and the adaptability of scanning device.
End support 4 and the following end support 3 gone up of the present invention made by rigid material.
In addition, vertical support frame 12 is with the connected mode of shell 8 or to adopt conventional structure, as by at shell 8 draw-in groove being set, or web member is set by connections such as pins, bolt at shell 8, as long as can be by the support of vertical support frame 12, it is just passable to make shell 8 remain on the upright or angle of inclination of regulation, and its concrete structure is not limited.And an end of this vertical support frame 12 can also be connected with last end support 4 rotationally, as shown in Figure 4.
Please cooperate referring to Fig. 5, in a specific embodiment, following end support 3 has the rack body 30 that can fixedly connected with base 2, the clip 32 that can fixedly connected with an end of shell 8, be connected by rotating shaft 31 between described clip 32 and the rack body 30, thereby make the shell 8 can be with respect to end support 3 rotations down by this rotating shaft 31.
The above only is the schematic embodiment of the present invention, is not in order to limit scope of the present invention.Any those skilled in the art, the equivalent variations of doing 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.And need to prove, each ingredient of the present invention is not limited in above-mentioned overall applicability, each technical characterictic of describing in the instructions of the present invention can select one to adopt or select the multinomial use that combines separately according to actual needs, therefore, other combination relevant with this case inventive point and concrete the application have been contained in the present invention in the nature of things.

Claims (9)

1. rock core CT scan method based on the vertical gas injection in top, the device of use comprise CT scan system, displacement system, cover pressing system, pressure-measuring system, be used for heterogeneous body multiple-lay core gripper and the metering system of CT scan; The core holding unit that wherein should be used for CT scan is to comprise polyether-ether-ketone resin shell (8), rubber tube (9), rock core top end (10), top (6) under the rock core, rock core model (7), inlet (11), liquid outlet (5), base (2), time end support (3), last end support (4) and vertical support frame (12); Following end support (3) links to each other polyether-ether-ketone resin shell (8) with last end support (4) with base, wherein, one end of described shell is connected with following end support (3), and can be around end support (3) rotation down, described shell can turn to horizontality, and the other end of described shell can be supported on described going up on the 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, its polyether-ether-ketone resin shell (8) can be adjusted to level and vertical between any direction and fixing; It is characterized in that core holding unit is in plumbness or vertical substantially state in the injection gas displacement process, when carrying out CT scan, core holding unit is placed horizontality.
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 at polyether-ether-ketone resin shell (8).
3. rock core CT scan method according to claim 1 is characterized in that, on the top a plurality of liquid outlets is set under this rock core, and the rock core liquid outlet is communicated with rock core room and metering system, and each liquid outlet (5) is aimed at one deck rock 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 the cube cavity to hold cube rock core or cylindrical cavity to hold the 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 rock core model is the 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, described down end support (3) is connected with polyether-ether-ketone resin shell (8) by rotating shaft (31), this rotating shaft (31) apart from the distance of base (2) less than 1/2 of clamper length.
8. rock core CT scan method according to claim 7 is characterized in that, described rotating shaft (31) apart from the distance of base (2) less than 1/3 of clamper length.
9. rock core CT scan method according to claim 1 is characterized in that, described upward end support (4) and following end support (3) are rigid material.
CN201310181935.XA 2013-05-16 2013-05-16 Based on the rock core CT scan method of plan vertical gas injection Active CN103278516B (en)

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CN104374682A (en) * 2014-11-12 2015-02-25 中国石油天然气股份有限公司 Rock core CT (Computed Tomography) scanning analysis method and device
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN103592319A (en) * 2013-10-23 2014-02-19 中国石油天然气股份有限公司 Constant-temperature heating system suitable for CT (computerized tomography) scanning rock core displacement experiments and capable of stimulating oil reservoir conditions
CN103592320A (en) * 2013-10-23 2014-02-19 中国石油天然气股份有限公司 Constant-temperature heating method suitable for CT (computerized tomography) scanning rock core displacement experiments and capable of stimulating oil reservoir conditions
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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
CN103868801A (en) * 2014-02-26 2014-06-18 中国石油天然气股份有限公司 Rock performance evaluating device
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
CN104374682A (en) * 2014-11-12 2015-02-25 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)
CN109690311A (en) * 2016-08-09 2019-04-26 沙特阿拉伯石油公司 Multi-functional diplocardia displacement of reservoir oil device and method

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