CN102162784B - Non-homogenous multi-layer core holder for CT (computed tomography) scanning - Google Patents

Non-homogenous multi-layer core holder for CT (computed tomography) scanning Download PDF

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Publication number
CN102162784B
CN102162784B CN2010106106938A CN201010610693A CN102162784B CN 102162784 B CN102162784 B CN 102162784B CN 2010106106938 A CN2010106106938 A CN 2010106106938A CN 201010610693 A CN201010610693 A CN 201010610693A CN 102162784 B CN102162784 B CN 102162784B
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rock core
core
heterogeneous
fixed muffle
shell
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CN102162784A (en
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吕伟峰
张祖波
严守国
罗蔓莉
刘庆杰
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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 relates to a non-homogenous core holder for CT (computed tomography) scanning. A rubber cylinder is arranged in a shell; a core left top and a core right top arranged in the rubber cylinder and push against two ends of a multi-layer core mold; a core containing chamber which accommodates the multi-layer core mold is defined by the inner wall of the rubber cylinder, the core left top and the core right top; a left fixed sleeve and a right fixed sleeve are respectively sleeved on the core left top and the core right top; an enclosed annular confining pressure space is defined by the outer wall of the rubber cylinder, the left fixed sleeve, the right fixed sleeve and the inner wall of the shell; the shell is provided with a confining pressure interface, a confining pressure exhaust hole and a confining pressure discharging hole; the core left top is internally provided with a liquid inlet and a core exhaust hole; and the core right top is internally provided with a middle-layer liquid outlet, an upper-layer liquid outlet and a lower-layer liquid outlet. The holder can detect the on-way distribution of fluid saturation in each layer section in a non-homogenous layer on line in real time, and also can observe fluid channeling among layers.

Description

The heterogeneous body multiple-lay core gripper that is used for CT scan
Technical field
The present invention relates to a kind of simulation oil field and close notes separate zone production test unit, be specifically related to a kind of heterogeneous body multiple-lay core gripper that is used for CT scan.
Background technology
The CT technical development is very fast, as measuring technology conventional in the core analysis, is widely used in the aspects such as measurement, flowing experiment research of nonuniformity mensuration, core sample selection, the crack quantitative test of core description, rock core, online saturation degree.Through 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 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, and, utilize the CT technology more can obtain the fluid saturation distributed intelligence in each layer intuitively, and can further study the layer cross flow phenomenon for the research of in-layer heterogeneity.
About heterogeneous research, be divided in the layer and study with the interlayer heterogeneous body at present, the heterogeneous research method of interlayer is simple, adopts a plurality of parallelly connected rock cores more, and clamper is simple relatively with metering.Research about in-layer heterogeneity is fewer, present method be with synthetic core be pressed into a multilayered model with epoxy gluing as heterogeneous body system in the simulation layer.Another kind method is to be pressed into a multilayered model with synthetic core, in core holding unit, carries out displacement test, with the displacement of reservoir oil rule of heterogeneous body system in the research layer.Its shortcoming is that existing core holding unit has an inlet and a liquid outlet, can only measure the variation of the whole oil displacement efficiency of multilayer rock core model in the injecting process, and can't realize stratified stoichiometric, can not observe interlayer crossfire phenomenon.And can only measure factor of porosity, permeability and the oil saturation of The model, can't measure the parameter of each pervious course.Thereby can't realize closing the evaluation of annotating each oil reservoir oil displacement efficiency in the separate zone production.Can not simulate burden pressure with epoxy gluing as heterogeneous body system in the simulation layer in addition.In addition, the metal shell that conventional core holding unit adopts is very strong to the absorption of X ray, makes X ray " wear and not pass through " metal shell, ray hardened " the pseudo-shadow " that causes, and these are to influence the CT technology to be applied to layer principal element of interior heterogeneous body research.
Summary of the invention
The purpose of this invention is to provide a kind of core holding unit that can be applied to CT scan and can accurately measure water displacing oil Changing Pattern in the heterosphere.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
A kind of heterogeneous body multiple-lay core gripper that is used for CT scan of the present invention is by shell, rubber tube, and top, a rock core left side, the right top of rock core, left fixed muffle, right fixed muffle, left fastening sleeve, right fastening sleeve and fixed support constitute;
The polyether-ether-ketone resin shell is cylindric, and rubber tube places enclosure, with the shell concentric; Multilayer rock core model is arranged in the rubber tube internal cavity; Top, a rock core left side; The right top of rock core is removably replaced in rubber tube, the two ends of multilayer rock core model; Its shape and size conform to the rubber tube inwall, form the rock core room that holds multilayer rock core model between the inwall of rubber tube and top, a rock core left side and the right top of rock core; Left side fixed muffle and right fixed muffle are set in respectively on the right top of top, a rock core left side and rock core, and left fixed muffle is connected through axial confined pressure O-ring seal with the shell two ends with right fixed muffle periphery; The rubber tube outer wall forms an airtight annular confined pressure space between left fixed muffle and right fixed muffle and the outer casing inner wall; Fastening sleeve in a left side and right fastening sleeve are set in respectively on top, a rock core left side and the right top of rock core, are positioned at left fixed muffle and the right fixed muffle outside; Shell is provided with confined pressure interface, confined pressure vent port, confined pressure pressure relief vent; Be provided with inlet in the top, a rock core left side and be communicated with the rock core room, be provided with the rock core vent port and be communicated with the rock core room; Rock core is provided with middle level liquid outlet, upper strata liquid outlet, lower floor's liquid outlet in the right top; Be communicated with the rock core room; Each liquid outlet is aimed at one deck rock core model respectively; At the seam crossing between corresponding adjacent two layers rock core model on the right top of rock core bar shaped liquid outlet sealing gasket is set, so that flow out from the corresponding liquid outlet of each layer through the effluent of every layer of rock core model; Fixed support is positioned at the shell below.
This multilayer rock core model by a plurality of have different permeabilities natural, appear or artificial individual layer rock core combines.
The aforesaid heterogeneous body multiple-lay core gripper that is used for CT scan, wherein, each individual layer rock core can be the identical rectangular parallelepiped rock core of shape.
The aforesaid heterogeneous body multiple-lay core gripper that is used for CT scan, wherein, this rubber tube outside can be square, and inside has the rectangular parallelepiped cavity to hold the rectangular parallelepiped rock core, and its two ends have circular interface.
On the other hand, the present invention also comprises a kind of interlayer heterogeneous body multiple-lay core gripper that is used for CT scan, and it is aforesaid heterogeneous body multiple-lay core gripper, and the film of isolating profit is set on the adjacent two layers rock core surface of contact of its multilayer rock core model.
The aforesaid heterogeneous body multiple-lay core gripper that is used for CT scan, wherein, this multilayer rock core model 9 can use individual layer homogeneous or heterogeneous core to substitute.
The aforesaid heterogeneous body multiple-lay core gripper that is used for CT scan, wherein, this individual layer rock core can be cylindrical or rectangle.
Beneficial effect of the present invention is that (1) the present invention changes the metal shell of traditional core holding unit to weak polyether-ether-ketone resin (PEEK) shell of X ray absorption into, can reduce ray hardened " the pseudo-shadow " that causes, thereby reduce experimental error.PEEK is a kind of special engineering plastics of excellent performance, and it is high temperature resistant, superior, self lubricity is good, the chemicals-resistant burn into is fire-retardant, have anti-fissility and radioresistance, insulativity is stable, hydrolysis and be prone to processing, and the PEEK creep-resistant property is high; Other mechanical property is also than higher, and PEEK at high temperature also can keep its mechanical property and size; The dielectric properties of PEEK are good, in very wide frequency, temperature; Under the humidity, can both keep constant.Therefore be as the desirable sheathing material of CT scan with core holding unit.(2) core holding unit of the present invention can adopt natural reservoir cores and apply confined pressure, has simulated the actual conditions of heterogeneous reservoir in the layer truly.(3) this core holding unit can make the liquid of each rock core layer of flowing through flow out from different outlets respectively through unique top design, realizes stratified stoichiometric.Through CT scan, can realize distributing of interior each interval fluid saturation of real time on-line monitoring heterosphere along journey, also can be observed the layer cross flow phenomenon.(4) to have improved the bonding rock core of multilayer of non-homogeneous model in the tradition stratum be the independent assortment single-layer model in the present invention, and each individual layer parameter can obtain separately, and can flexible combination simulating multiple heterogeneous reservoir.(5) the present invention changes into cube with the cylindric outer shape of tradition stratum rubber tube, and has reduced the thickness of barrel, more helps the rubber tube internal cavities is applied confined pressure.(6) heterogeneous body multiple-lay core gripper of the present invention can be used in and measures non-homogeneous model in the layer; Simultaneously, only need the film of isolating profit is set between adjacent multilayer rock core model, can be used for measuring the interlayer non-homogeneous model, simplified the proving installation of a plurality of core holding unit parallel connections in the conventional method.(7) heterogeneous body multiple-lay core gripper of the present invention is applicable to the CT scan of individual layer, multilayer, circle and square homogeneous or heterogeneous core model.
Description of drawings
Fig. 1 is the structural representation of a kind of preferred implementation of the present invention;
Fig. 2 is the cut-open view of A-A ' among Fig. 1;
Fig. 3 is the cut-open view of B-B ' among Fig. 1;
Wherein: 1; Rock core vent port 2; Top, a rock core left side 3; The fastening sleeve 4 in a left side; Axial confined pressure O-ring seal 5; Lower floor's inlet 6; Left side fixed muffle 7; Confined pressure vent port 8; Shell 9; Multilayer rock core model 10; Confined pressure pressure relief vent 11; Fixed support 12; Annular confined pressure space 13; Rubber tube 14; Liquid outlet sealing gasket 15; Confined pressure interface 16; Right fixed muffle 17; The right top 18 of rock core; Middle level liquid outlet 19; Upper strata liquid outlet 20; Right fastening sleeve 21; Lower floor's liquid outlet
Embodiment
Embodiment 1 is used for the heterogeneous body multiple-lay core gripper of CT scan
Fig. 1-3 is depicted as the heterogeneous body multiple-lay core gripper structural representation that is used for CT scan of a kind of preferred implementation of the utility model; A kind of heterogeneous body multiple-lay core gripper that is used for CT scan is by shell 8, rubber tube 13, top, a rock core left side 2; The right top 17 of rock core; Left side fixed muffle 6, right fixed muffle 16, left fastening sleeve 3, right fastening sleeve 20 and fixed support 11 constitute;
Polyether-ether-ketone resin shell 8 is cylindric, and rubber tube 13 places shell 8 inside, with shell 8 concentrics; Multilayer rock core model 9 is arranged in rubber tube 13 internal cavities; Top, a rock core left side 2; The right top 17 of rock core is removably replaced in rubber tube 13, the two ends of multilayer rock core model 9; Its shape and size conform to rubber tube 13 inwalls, form the rock core room that holds multilayer rock core model 9 between the inwall of rubber tube 13 and top 2, a rock core left side and the right top 17 of rock core; Left side fixed muffle 6 and right fixed muffle 16 are set in respectively on the right top 17 of top 2, a rock core left side and rock core, and left fixed muffle 6 is connected through axial confined pressure O-ring seal 4 with shell 8 two ends with right fixed muffle 16 peripheries; Rubber tube 13 outer walls form an airtight annular confined pressure space 12 between left fixed muffle 6 and right fixed muffle 16 and shell 8 inwalls; The fastening sleeve 3 in a left side is set in respectively on top 2, a rock core left side and the right top 17 of rock core with right fastening sleeve 20, is positioned at the left fixed muffle 6 and right fixed muffle 16 outsides; Shell 8 is provided with confined pressure interface 15, confined pressure vent port 7, confined pressure pressure relief vent 10 and annular confined pressure space 12 and system connectivity; Be provided with inlet 5 in the top, a rock core left side 2 and be communicated with displacement system and rock core room, be provided with rock core vent port 1 and be communicated with rock core room and ambient atmosphere; Rock core is provided with middle level liquid outlet 18, upper strata liquid outlet 19, lower floor's liquid outlet 21 in the right top 17; Be communicated with rock core room and metering system; Each liquid outlet is aimed at one deck rock core model respectively; At the seam crossing between corresponding adjacent two layers rock core model on the right top 17 of rock core bar shaped liquid outlet sealing gasket 14 is set, so that flow out from the corresponding liquid outlet of each layer through the effluent of every layer of rock core model; Fixed support 11 is positioned at shell 8 belows.
Non-homogeneous model oil-water displacement efficiency CT scan evaluation experimental in 2 layers of the embodiment
At first get three natural reservoir cores that pick up from different depth, process the rectangular parallelepiped individual layer rock core model of same size.Measure the factor of porosity and the air permeability of each individual layer rock core model respectively; With the saturated local water of each individual layer rock core, measure water phase permeability respectively; Respectively each individual layer rock core is carried out oily expelling water subsequently, reach the irreducible water saturation of measuring the effective permeability of oil phase behind the irreducible water state and calculating each individual layer rock core.
Each layer rock core that will contain irreducible water arranged the rock core room of putting into embodiment 1 described core holding unit according to the anti-rhythm; Fixedly upper and lower top of the rock core of core holding unit and upper and lower fixed muffle.The confined pressure interface is connected on the confined pressure pump; Core holding unit is put into the CT scan system [for example adopt GE Light Speed 8 multi-layer helical scanning systems (Medical CT); Minimum scanning bed thickness 0.625mm, maximum scan voltage 140kV, the degree of accuracy of measuring saturation degree is 1%].Start the confined pressure pump and add confined pressure 0~35MPa.Speed with 0~10ml/min is carried out the water displacing oil operation to rock core.The displacement pressure reduction at the cumulative oil production the when water breakthrough time that accurate recording is every layer, water breakthrough, cumulative liquid production, rock sample two ends and above-mentioned parameter are measured behind water breakthrough over time.Composite water cut reaches at 99.95% o'clock and finishes experiment.Utilize the CT scan system, but the convection cell saturation degree realizes real time on-line monitoring, and the saturation degree that can obtain each individual layer distributes along journey, also can observe the layer cross flow phenomenon.

Claims (7)

1. a heterogeneous body multiple-lay core gripper that is used for CT scan is by shell, rubber tube, and top, a rock core left side, the right top of rock core, left fixed muffle, right fixed muffle, left fastening sleeve, right fastening sleeve and fixed support constitute; It is characterized in that:
The polyether-ether-ketone resin shell is cylindric, and rubber tube places enclosure, with the shell concentric; Multilayer rock core model is arranged in the rubber tube internal cavity; Top, a rock core left side; The two ends with multilayer rock core model are removably replaced in rubber tube in the right top of rock core; Its shape and size conform to the rubber tube inwall, form the rock core room that holds multilayer rock core model between the inwall of rubber tube and top, a rock core left side and the right top of rock core; Left side fixed muffle and right fixed muffle are set in respectively on the right top of top, a rock core left side and rock core, and left fixed muffle is connected through axial confined pressure O-ring seal with the shell two ends with right fixed muffle periphery; The rubber tube outer wall forms an airtight annular confined pressure space between left fixed muffle and right fixed muffle and the outer casing inner wall; Fastening sleeve in a left side and right fastening sleeve are set in respectively on top, a rock core left side and the right top of rock core, are positioned at left fixed muffle and the right fixed muffle outside; Shell is provided with confined pressure interface, confined pressure vent port, confined pressure pressure relief vent; Be provided with inlet in the top, a rock core left side and be communicated with the rock core room, be provided with the rock core vent port and be communicated with rock core room and ambient atmosphere; Rock core is provided with middle level liquid outlet, upper strata liquid outlet, lower floor's liquid outlet in the right top; Be communicated with the rock core room; Each liquid outlet is aimed at one deck rock core model respectively; At the seam crossing between corresponding adjacent two layers rock core model on the right top of rock core bar shaped liquid outlet sealing gasket is set, so that flow out from the corresponding liquid outlet of each layer through the effluent of every layer of rock core model; Fixed support is positioned at the shell below.
2. the heterogeneous body multiple-lay core gripper that is used for CT scan according to claim 1 is characterized in that: multilayer rock core model by a plurality of have different permeabilities natural, appear or artificial individual layer rock core combines.
3. the heterogeneous body multiple-lay core gripper that is used for CT scan according to claim 2 is characterized in that: described individual layer rock core is the identical rectangular parallelepiped rock core of shape.
4. the heterogeneous body multiple-lay core gripper that is used for CT scan according to claim 1 is characterized in that: said rubber tube is outside, and inside has the rectangular parallelepiped cavity for square, and its two ends are circular interface.
5. the heterogeneous body multiple-lay core gripper that is used for CT scan according to claim 1 is characterized in that: the film of isolating profit is set on the adjacent two layers rock core surface of contact of said multilayer rock core model.
6. the heterogeneous body multiple-lay core gripper that is used for CT scan according to claim 1 is characterized in that: described multilayer rock core model substitutes with individual layer homogeneous or heterogeneous core.
7. the heterogeneous body multiple-lay core gripper that is used for CT scan according to claim 6 is characterized in that: described individual layer homogeneous or heterogeneous core are cylindrical or rectangle.
CN2010106106938A 2010-12-17 2010-12-17 Non-homogenous multi-layer core holder for CT (computed tomography) scanning Active CN102162784B (en)

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CN102636503B (en) * 2011-11-24 2014-04-02 大连理工大学 CT (Electronic Computed X-ray Tomography technique) reformer for natural gas hydrate nature core and using method thereof
CN102419363B (en) * 2011-12-05 2014-12-17 中国石油大学(华东) Core clamping mechanism
CN103234888B (en) * 2013-04-17 2014-12-24 中国石油天然气股份有限公司 Long rock core holder
CN103278516B (en) * 2013-05-16 2015-09-09 中国石油天然气股份有限公司 Based on the rock core CT scan method of plan vertical gas injection
CN105241901A (en) * 2015-10-16 2016-01-13 中国石油天然气股份有限公司 Method for determining three phase fluid saturation
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CN106093079B (en) * 2016-08-22 2019-02-12 江苏联友科研仪器有限公司 A kind of nonmetallic core holding unit of super-pressure
CN107255610B (en) * 2017-05-02 2020-05-08 中国石油天然气股份有限公司 Method and device for detecting fluid saturation of rock core
CN108181165B (en) * 2017-11-22 2020-02-14 中国石油天然气股份有限公司 Core holder
CN108169261B (en) * 2018-01-05 2021-02-19 四川省川建勘察设计院有限公司 Rock core holder for CT scanning
CN108918375A (en) * 2018-05-15 2018-11-30 常州大学 Consider the stacking rock core displacement test device and method of channelling
CN109060608A (en) * 2018-07-09 2018-12-21 西南石油大学 The multiple dimensioned water seal mechanism of qi reason visual experimental apparatus of high temperature and pressure and method

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