CN102094642B - Intraformationally heterogeneous model oil-water displacement efficiency evaluation system - Google Patents

Intraformationally heterogeneous model oil-water displacement efficiency evaluation system Download PDF

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CN102094642B
CN102094642B CN 201010610695 CN201010610695A CN102094642B CN 102094642 B CN102094642 B CN 102094642B CN 201010610695 CN201010610695 CN 201010610695 CN 201010610695 A CN201010610695 A CN 201010610695A CN 102094642 B CN102094642 B CN 102094642B
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rock core
core
model
liquid outlet
fixed muffle
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CN102094642A (en
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张祖波
吕伟峰
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 an intraformationally heterogeneous model testing system. The rubber cylinder of a multilayered core holder is arranged in a shell; a left core pressing head and a right core pressing head are pressed to the two ends of a multilayered core model; a core accommodating chamber for accommodating the multilayered core model is formed among the inner wall of the rubber cylinder, the left core pressing head and the right core pressing head; a closed annular confining pressure room is formed among the outer wall of the rubber cylinder, a left fixing sleeve, a right fixing sleeve and the inner wall of the shell; the shell is provided with a confining pressure interface which is communicated with the annular confining pressure room and an overburden pressure system; a liquid inlet is formed in the left core pressing head and is communicated with a displacement system and the core accommodating chamber by a pressure measurement system; a liquid outlet is formed in the right core pressing head and is communicated with the core accommodating chamber and a metering system; and a strip liquid outlet gasket corresponds to a joint between two adjacent layers of core models on the right core pressing head, so that flowing liquid which passes through every layer of core model flows out of the liquid outlet of the corresponding layer. The system can accurately reflect the changing law of intraformationally heterogeneous oil-water displacement in mixed water injection layer mining.

Description

Non-homogeneous model oil-water displacement efficiency evaluation system in the layer
Technical field
The present invention relates to a kind of simulation oil field and close notes separate zone production experimental rig, be specifically related to non-homogeneous model water drive oil simulation test device in a kind of layer.
Background technology
In oil field development, reservoir heterogeneity is one of key factor that affects oil field development, especially merge in the situation of water filling at oil reservoir, reservoir heterogeneity not only makes the core intersection sweep efficiency reduce, and the oil displacement efficiency of each oil reservoir in the water filling series of strata produced larger impact, reduce ultimate recovery.Therefore, understand the Changing Pattern of non-homogeneous pay oil displacement efficiency in the injecting process, provide theoretical foundation for adjustment exploitation measure, raising development effectiveness.
About heterogeneous research, be divided in the layer and heterogeneity research at present, the research method of heterogeneity is simple, adopts a plurality of rock cores in parallel more, and clamper is relative simple with metering.Research and comparison about in-layer heterogeneity is few, and present method is that the multilayer artificial core that will have different parameters is combined into multilayer rock core model usefulness epoxy gluing as heterogeneous system in the simulation layer.Another kind method is to be pressed into a multilayered model with artificial core, carries out displacement test in core holding unit, with the displacement of reservoir oil rule of heterogeneous 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.And can only measure degree of porosity, permeability and the oil saturation of whole model, can't measure the parameter of each permeable formation.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 system in the simulation layer in addition, these all are the technical problems that needs to be resolved hurrily in heterogeneous research in the layer.
Summary of the invention
The purpose of this invention is to provide non-homogeneous model oil-water displacement efficiency evaluation system in a kind of layer, this system can realize accurately measuring the Changing Pattern of each oil reservoir oil displacement efficiency in the interior heterogeneous system of layer.
For achieving the above object, the present invention includes following technical scheme:
Non-homogeneous model pilot system in the layer comprises: the displacement system, cover pressing system, pressure-measuring system, heterogeneous multi-layer core holding unit and metering system;
Wherein heterogeneous multi-layer core holding unit is by shell, rubber tube, and the left top of rock core, the right top of rock core, left fixed muffle, right fixed muffle, left fastening sleeve, right fastening sleeve and fixed support consist of;
Stainless steel casing is cylindric, and rubber tube places enclosure, with the shell concentric; Multilayer rock core model is arranged in the rubber tube internal cavity; The left top of rock core, the right top of rock core is removably supported 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 left top of the inwall of rubber tube and rock core and the right top of rock core; Left fixed muffle and right fixed muffle are set in respectively on the left top of rock core and the right top of rock core, left fixed muffle be connected the fixed muffle periphery and be connected by axial confined pressure sealing ring with the shell two ends; 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; Left fastening sleeve and right fastening sleeve are set in respectively on the left top of rock core 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 steam vent, confined pressure interface, confined pressure interface and annular confined pressure space and cover pressing system and be communicated with; Be provided with inlet in the left top of rock core and be communicated with displacement system and rock core room by pressure-measuring system, be provided with the rock core steam vent and be communicated with rock core room and ambient atmosphere; Be provided with middle level liquid outlet, upper strata liquid outlet, lower floor's liquid outlet in the right top of rock core, be communicated with rock core room and metering system, each liquid outlet is aimed at respectively one deck rock core model, at the seam crossing between corresponding adjacent two layers rock core model on the right top of rock core bar shaped liquid outlet sealing mat is set, so that flow out from the corresponding liquid outlet of each layer by the efflux 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 aperture degree and permeability natural, appear or artificial individual layer rock core combines.
Non-homogeneous model pilot system in the aforesaid layer, wherein, each individual layer rock core can be the identical cuboid rock core of shape.
Non-homogeneous model pilot system in the aforesaid layer, wherein, this rubber tube outside can be cube, and inside can have the cuboid cavity to hold the cuboid rock core, and its two ends are circular interface.
Beneficial effect of the present invention is that pilot system of the present invention can adopt natural reservoir cores and apply confined pressure, has simulated truly the actual conditions of heterogeneous reservoir in the layer; The core holding unit of this system can make the liquid of each rock core layer of flowing through flow out from different outlets respectively by unique plug designing, has realized the layering measurement, can accurately reflect and close the Changing Pattern of annotating heterogeneous body water drive oil in the separate zone production middle level; The laminated rock core that this system has improved non-homogeneous model in the tradition stratum is the independent assortment single-layer model, and each individual layer parameter can obtain separately, and can flexible combination simulating multiple heterogeneous reservoir.
Description of drawings
Fig. 1 is non-homogeneous model pilot system schematic diagram in the layer of the present invention;
Fig. 2 is the structural representation of heterogeneous multi-layer core holding unit of the present invention;
Fig. 3 is the sectional view of A-A ' among Fig. 2;
Fig. 4 is the sectional view of B-B ' among Fig. 2;
Wherein: 1, rock core steam vent 2, the left top 3 of rock core, left fastening sleeve 4, axial confined pressure sealing ring 5, inlet 6, left fixed muffle 7, shell 8, rubber tube 9, confined pressure steam vent 10, multilayer rock core model 11, fixed support 12, annular confined pressure space 13, confined pressure interface 14, right fixed muffle 15, the right top 16 of rock core, middle level liquid outlet 17, upper strata liquid outlet 18, liquid outlet sealing mat 19, right fastening sleeve 20, liquid outlet A displacement system of lower floor, B covers pressing system, the C pressure-measuring system, the D core holding unit, the E metering system
Fig. 5 is the first group model water drive oil indicatrix;
Fig. 6 is the second group model water drive oil indicatrix.
The specific embodiment
The present invention is described in detail below in conjunction with instantiation.
Non-homogeneous model pilot system in 1 layer of the embodiment
As shown in Figure 1, in the layer non-homogeneous model pilot system by the A of displacement system, cover pressing system B, pressure-measuring system C, core holding unit D and metering system E and form.
The displacement system is comprised of two high-pressure metering pumps, can carry simultaneously two kinds of fluids, is the power source of displacement.Flow rates: 0.001-15ml/min, maximum pressure: 70MPa.
Cover pressing system and be comprised 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 comprised of a plurality of pressure sensors, and two high-pressure transducer ranges are 70MPa, links to each other with the displacement pump, also has in addition three low-pressure sensor, is used for measuring the pressure at rock core two ends, 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 D is the custom-designed heterogeneous multi-layer core holding unit of pilot system of the present invention, please refer to Fig. 2,3 and 4, be used for heterogeneous multi-layer core holding unit by shell 7, rubber tube 8, the left top 2 of rock core, the right top 15 of rock core, left fixed muffle 6, right fixed muffle 14, left fastening sleeve 3, right fastening sleeve 19 and fixed support 11 consist of;
Stainless steel casing 7 is cylindric, and rubber tube 8 places shell 7 inside, with shell 7 concentrics; Multilayer rock core model 10 is arranged in rubber tube 8 internal cavities; The left top 2 of rock core, the right top 15 of rock core is removably supported in rubber tube 8, the two ends of multilayer rock core model 10, its shape and size conform to rubber tube 8 inwalls, form the rock core room that holds multilayer rock core model 10 between the left top 2 of the inwall of rubber tube 8 and rock core and the right top 15 of rock core; Left fixed muffle 6 and right fixed muffle 14 are set in respectively on the left top 2 of rock core and the right top 15 of rock core, left fixed muffle 6 be connected fixed muffle 14 peripheries and be connected by axial confined pressure sealing ring 4 with shell 7 two ends; Rubber tube 8 outer walls form an airtight annular confined pressure space 12 between left fixed muffle 6 and right fixed muffle 14 and shell 7 inwalls; Left fastening sleeve 3 and right fastening sleeve 19 are set in respectively on the left top 2 of rock core and the right top 15 of rock core, are positioned at left fixed muffle 6 and right fixed muffle 14 outsides; Shell 7 is provided with confined pressure steam vent 9, confined pressure interface 13, confined pressure interface and annular confined pressure space 12 and cover pressing system B and be communicated with; Be provided with inlet 5 in the left top 2 of rock core and be communicated with the displacement A of system and rock core room by pressure-measuring system C, be provided with rock core steam vent 1 and be communicated with rock core room and ambient atmosphere; Rock core is provided with middle level liquid outlet 16, upper strata liquid outlet 17, lower floor's liquid outlet 20 in the right top 15, be communicated with rock core room and metering system E, each liquid outlet is aimed at respectively one deck rock core model, at the seam crossing between corresponding adjacent two layers rock core model on the right top 15 of rock core bar shaped liquid outlet sealing mat 18 is set, so that flow out from the corresponding liquid outlet of each layer by the efflux of every layer of rock core model; Fixed support 11 is positioned at shell 7 belows.
Embodiment 2
Use non-homogeneous model pilot system in the layer described in the embodiment 1, wherein, the A of displacement system (Quizix SP-5200 pump group), cover pressing system B (JP-800 pump group), pressure-measuring system C (PLV-1 pressure transmitter).
Rock core is the rock core of Ji Dong oil field EsII, EsIII layer, and is hydrophilic, and specification is 7.5cm * 4.5cm * 1.5cm; Formation water salinity is 3729mg/L; Experiment is neutral white oil with oil, and viscosity ratio of oil and water is 10.3.
The basic properties of core parameter sees Table 1.
Table 1 rock core basic parameter table
One group of (three) dull and stereotyped individual layer rock core of known irreducible water saturation and oleic permeability is arranged according to the anti-rhythm, put into core holding unit, add confined pressure 10MPa.With the speed of 3.0ml/min rock core is carried out displacement with oil, measure every layer oil pump capacity and speed.Then with the speed of 3.0ml/min rock core is carried out flood pot test.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.When reaching 99.95%, finishes composite water cut experiment.
First group and the second group model WATER FLOODING CHARACTERISTIC CURVE are seen Fig. 5 and Fig. 6, table 2 is non-homogeneous model water drive oil integrated data tables in the layer, because system adopts new design, every layer oil content is known before the water drive, high permeability formation calculates oil displacement efficiency by every layer of oil content and calculates and surpass 100%, in the explanation, the oily channelling of less permeable layer is to high permeability formation.
Non-homogeneous model water drive oil integrated data table in the table 2 layer
The interior non-homogeneous model coefficient of variation and water drive oil integrated data are as shown in table 3, and this result shows the coefficient of variation, the coefficient of advancing by leaps and bounds, permeability grade increase, serious heterogeneity in the test model layer, and oil displacement efficiency reduces.
The non-homogeneous model coefficient of variation and water drive oil integrated data table in the table 3 layer

Claims (2)

1. non-homogeneous model oil-water displacement efficiency evaluation system in the layer is by the displacement system, cover pressing system, pressure-measuring system, multiple-lay core gripper and metering system and consist of; It is characterized in that:
Wherein multiple-lay core gripper is made of shell, rubber tube, the left top of rock core, the right top of rock core, left fixed muffle, right fixed muffle, left fastening sleeve, right fastening sleeve and fixed support;
Stainless steel casing is cylindric, and rubber tube places enclosure, with the shell concentric; Multilayer rock core model is arranged in the rubber tube internal cavity; The left top of rock core, the right top of rock core are removably supported 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 left top of the inwall of rubber tube and rock core and the right top of rock core; Left fixed muffle and right fixed muffle are set in respectively on the left top of rock core and the right top of rock core, left fixed muffle be connected the fixed muffle periphery and be connected by axial confined pressure sealing ring with the shell two ends; Form an airtight annular confined pressure space between rubber tube outer wall, left fixed muffle, right fixed muffle and the outer casing inner wall; Left fastening sleeve and right fastening sleeve are set in respectively on the left top of rock core 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 steam vent, confined pressure interface; Confined pressure interface and annular confined pressure space and cover pressing system and be communicated with; Be provided with inlet in the left top of rock core and be communicated with displacement system and rock core room by pressure-measuring system, be provided with the rock core steam vent and be communicated with rock core room and ambient atmosphere; Be provided with middle level liquid outlet, upper strata liquid outlet, lower floor's liquid outlet in the right top of rock core, be communicated with rock core room and metering system, each liquid outlet is aimed at respectively one deck rock core model, at the seam crossing between corresponding adjacent two layers rock core model on the right top of rock core bar shaped liquid outlet sealing mat is set, so that flow out from the corresponding liquid outlet of each layer by the efflux of every layer of rock core model; Fixed support is positioned at the shell below.
2. non-homogeneous model oil-water displacement efficiency evaluation system in the layer according to claim 1 is characterized in that: described rubber tube is outside to be cube, and inside has the cuboid cavity, and its two ends are circular interface.
CN 201010610695 2010-12-17 2010-12-17 Intraformationally heterogeneous model oil-water displacement efficiency evaluation system Active CN102094642B (en)

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