CN101701898B - Method and device for measuring rock core porosity by adopting constant pressure and variable volume method - Google Patents

Method and device for measuring rock core porosity by adopting constant pressure and variable volume method Download PDF

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Publication number
CN101701898B
CN101701898B CN2009102299337A CN200910229933A CN101701898B CN 101701898 B CN101701898 B CN 101701898B CN 2009102299337 A CN2009102299337 A CN 2009102299337A CN 200910229933 A CN200910229933 A CN 200910229933A CN 101701898 B CN101701898 B CN 101701898B
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China
Prior art keywords
volume
core
chamber
rock core
valve
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CN2009102299337A
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Chinese (zh)
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CN101701898A (en
Inventor
李晓东
邵东亮
赵希春
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Qingdao Shida Shiyi Technology Co Ltd
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Qingdao Shida Shiyi Technology Co Ltd
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Abstract

The invention relates to a method and a device for measuring rock core porosity by adopting a constant pressure and variable volume method, wherein the device mainly comprises a precise plunger piston, an air source pipe, an air source control valve, a standard chamber, a pressure sensor, a release valve, an isolating valve, a clamp and a rock core, wherein the standard chamber is cylindrical, a central cavity is arranged inside the standard chamber, the precise plunger piston is inserted in the central cavity, an air source interface and a pressure sensor interface are arranged at the peripheral side of the lower part of the standard chamber, the air source interface is connected with a high pressure air source through the air source pipe and the air source control valve, an air outlet interface is arranged at the bottom or the peripheral side of the standard chamber and is respectively connected with two end joints of the clamp through air pipes, the rock core is clamped between the two end joints, a rubber barrel is sleeved at the periphery, the joints, the rock core and the rubber barrel are clamped by the clamp through bolts, vent holes of the two joints cling to both end surfaces of the rock core, or a vent port is communicated with a rock core chamber through the air pipe, and the isolating valve and the release valve are arranged on the air pipe for communicating the clamp or the rock core chamber; the pressure sensor interface is directly connected with the pressure sensor.

Description

Adopt isobaric variable volume method to measure the method and the device of core porosity
One, technical field
The present invention relates to a kind of method and device that adopts isobaric variable volume method to measure core porosity, be applicable to that oil, geology, mining industry field carry out core porosity and measure in the laboratory, the core porosity that is specially adapted under the superelevation pore pressure situation is measured.
Two, background technology
The porosity measurement method is varied, using is at most gas method the most widely, and it is to utilize gas isothermal conversion principle (glass horse law), and the method for appearances (contrast chamber volume is constant) transformation (pressure is variation before and after diffusion) such as employing is measured, method is simple, and is easy to operate.Test process mesoporosity pressure substantially all is in 1MPa.Development along with petroleum industry, ultralow oil impregnate gas reservoir, super dark hydrocarbon-bearing pool more and more are much accounted of, gaging hole crack degrees of data is not too suitable under low pore pressure, and reason is: 1, gas under low pressure is difficult to enter the ultralow internal void that oozes rock core, causes the inaccurate of test result; 2, super dark hydrocarbon-bearing pool often is accompanied by the pore pressure (for example 60MPa even higher) of superelevation, and the factor of porosity data deficiencies that records under low pore pressure is to represent actual conditions; Can cause a series of problem, particularly safety problem if 3 improve gaseous tension simply.Because want to satisfy the 60MPa pore pressure, need the original pressure about 120MPa, the pressure source before the original pressure is higher again.
Three, summary of the invention
The object of the invention provides a kind of method and device that adopts isobaric variable volume method to measure core porosity, can in super wide pore pressure scope, accurately measure core porosity, and be under the original pressure situation identical with pore pressure, to realize, solved the safety problem that the superelevation original pressure brings.
Method of testing of the present invention comprises the steps: at least
1, measures diameter, the length of rock core, calculate the cumulative volume of rock core.When measuring volume of voids, rock core is put into core holding unit, and load burden pressure; When measuring particle volume, rock core is put into core chamber;
2, adjust the standard chamber volume, when measuring volume of voids, be greater than the pipeline volume between rock pore volume+isolation valve and the rock core; When measuring particle volume, be greater than the pipeline volume between core chamber's volume+isolation valve and the core chamber;
3, close isolation valve and atmospheric valve, open the source of the gas valve and to required pore pressure, close the source of the gas valve to the standard chamber gas injection;
4, open isolation valve, gas spreads in rock core, reduces the standard chamber volume then and with pressure gas its pore pressure value that boosts to setting and maintenance is stablized a period of time;
5, record standard chamber volume reducing value Δ V;
6, calculate: V p=Δ V-V 0
V g=ΔV-V 0-V s
Ф=(V p/ V) * 100% or Ф={ V p/ (V p+ V g) | * 100%
In the formula: V is the rock core cumulative volume
V 0Be the pipeline dead volume
V sBe core chamber's volume
V pBe rock pore volume
V gBe the rock core particle volume
Δ V is that standard chamber reduces volume
Ф is a core porosity
7, open the atmospheric valve pressure release, removal of core, experiment finishes.
A kind of method and device that adopts isobaric variable volume method to measure core porosity, mainly by precision plunger, the source of the gas pipe, the source of the gas operation valve, standard chamber, pressure transducer, atmospheric valve, isolation valve, clamper and rock core are formed, it is cylindrical to it is characterized in that standard chamber is made as, inside is provided with center cavity, precision plunger is inserted in the center cavity, the week side is provided with a gas source interface and a pressure sensor interface in the standard chamber bottom, gas source interface is connected with high-pressure air source with the source of the gas operation valve by the source of the gas pipe, bottom or all sides in standard chamber are provided with the interface of giving vent to anger, be connected respectively with two end connectors of clamper by tracheae, accompany rock core between two end connectors, periphery is with packing element, clamper uses bolt joint, rock core and packing element are tightly clamped, the air hole of two joints is close to the both ends of the surface of rock core, or the gas outlet is provided with isolation valve and atmospheric valve by tracheae and core chamber's connection on the tracheae of connecting clamper or core chamber; Pressure sensor interface directly is connected with pressure transducer.
The present invention solves ultra-low penetration hydrocarbon-bearing pool and super dark hydrocarbon-bearing pool core porosity problems of measurement adapts to the high safety of pressure.
Four, description of drawings
Fig. 1-measure structural representation of core porosity measurement device rock pore volume with isobaric variable volume method
Fig. 2-measure structural representation of core porosity measurement device rock core particle volume with isobaric variable volume method
1-precision plunger 2-source of the gas pipe 3-source of the gas operation valve 4-standard chamber 5-pressure transducer 6-atmospheric valve 7,8-isolation valve 9-clamper 10-packing element 11-rock core 12-core chamber among the figure
Five, embodiment
Experimental procedure is as follows:
1, measures diameter, the length of rock core 11, calculate the cumulative volume V of rock core 11.Put into core holding unit 9 then, and load burden pressure;
2, the length of control precision plunger 1 in standard chamber 4 is adjusted the volume of standard chamber 4, makes it greater than rock pore volume V pAnd isolation valve 7 and 8 and rock core 11 between pipeline dead volume V 0Sum is because volume of voids V pThe unknown, but replace by 40% of the cumulative volume V of experience coring 11;
3, close isolation valve 7 and 8 and atmospheric valve 6, open source of the gas valve 3, close source of the gas valve 3 after being changed to required pore pressure by pressure transducer 5 detected pressures to standard chamber 4 gas injections.The initial position of record precision plunger 1;
4, open isolation valve 7 and 8, gas spreads in rock core 11 by two ends, promotes precision plunger 1 then and with volume and the pressure gas that reduces standard chamber 4 its pore pressure value that boosts to setting and maintenance is stablized a period of time.The final position of record precision plunger 1;
5, calculating the volume that precision plunger 1 enters standard chamber 4 is standard chamber 4 volume reducing value Δ V;
6, calculate: V p=Δ V-V 0
Ф=(V p/V)×100%
In the formula: V is the rock core cumulative volume
V 0Be the pipeline dead volume
V pBe rock pore volume
Δ V is that standard chamber reduces volume
Ф is a core porosity
7, open atmospheric valve 6 pressure releases, removal of core 11, the volume of voids experiment finishes.
Embodiment is equipped with precision plunger 1 on the standard chamber 4 as shown in Figure 2, and the size of the position control standard chamber volume by regulating precision plunger 1 is measured the settle the standard variation of chamber volume of precision plunger 1 variation of length in standard chamber.Standard chamber connects source of the gas valve 3, atmospheric valve 6, pressure transducer 5, isolation valve 7 respectively by pipeline, and isolation valve 7 connects core chamber 12.
Experimental procedure is as follows:
1, measures diameter, the length of rock core 11, calculate the cumulative volume V of rock core 11.Put into core chamber 12 then;
2, the length of control precision plunger 1 in standard chamber 4 is adjusted the volume of standard chamber 4, makes it greater than the volume V of core chamber sAnd the pipeline volume V between isolation valve and the core chamber 0Sum;
3, close isolation valve 7 and atmospheric valve 6, open source of the gas valve 3, close source of the gas valve 3 after being changed to required pore pressure by pressure transducer 5 detected pressures to standard chamber 4 gas injections.The initial position of record precision plunger 1;
4, open isolation valve 7, gas spreads in rock core 11, promotes precision plunger 1 then and with volume and the pressure gas that reduces standard chamber 4 its pore pressure value that boosts to setting and maintenance is stablized a period of time.The final position of record precision plunger 1;
5, calculating the volume that precision plunger 1 enters standard chamber 4 is standard chamber 4 volume reducing value Δ V;
6, calculate: V g=Δ V-V 0-V s
Ф={(V-V p)/V}×100%
In the formula: V is the rock core cumulative volume
V 0Be the pipeline dead volume
V sBe core chamber's volume
V gBe the rock core particle volume
Δ V is that standard chamber reduces volume
Ф is a core porosity
7, open atmospheric valve 6 pressure releases, removal of core 11, the particle volume experiment finishes.

Claims (2)

1. method that adopts isobaric variable volume method to measure core porosity, it is characterized in that: this method comprises the steps: at least
1) diameter, the length of measurement rock core, the cumulative volume of calculating rock core; When measuring volume of voids, rock core is put into core holding unit, and load burden pressure; When measuring particle volume, rock core is put into core chamber;
2) adjust the standard chamber volume, when measuring volume of voids, be greater than pipeline volume and rock pore volume sum between isolation valve and the rock core; When measuring particle volume, be greater than pipeline volume and core chamber's volume sum between isolation valve and the core chamber;
3) close isolation valve and atmospheric valve, open the source of the gas valve and to required pore pressure, close the source of the gas valve to the standard chamber gas injection;
4) open isolation valve, gas spreads in rock core, reduces the standard chamber volume then and with pressure gas its pore pressure value that boosts to setting and maintenance is stablized a period of time;
5) record standard chamber volume reducing value, when measuring voidage, the standard chamber volume reduces value and is Δ V p, when measuring particle volume, the standard chamber volume reduces value and is Δ V g
6) calculate: voidage: V p=Δ V P-V 0p
Particle volume: V g=Δ V g-V 0g-V s
Core porosity: Φ=(V p/ V) * 100% or Φ={ V p/ (V p+ V g) * 100%
In the formula: V is the rock core cumulative volume
V OpPipeline volume between isolation valve and the rock core
V OgPipeline volume between isolation valve and the core chamber
V sBe core chamber's volume
V pBe rock pore volume
V gBe the rock core particle volume
Δ V pStandard chamber reduces volume when measuring volume of voids
Δ V gStandard chamber reduces volume when measuring particle volume
Φ is a core porosity
7) open the atmospheric valve pressure release, removal of core, experiment finishes.
2. device that adopts isobaric variable volume method to measure core porosity, mainly by precision plunger, the source of the gas pipe, the source of the gas operation valve, standard chamber, pressure transducer, atmospheric valve, isolation valve, clamper and core chamber form, it is cylindrical to it is characterized in that standard chamber is made as, inside is provided with center cavity, precision plunger is inserted in the center cavity, the week side is provided with a gas source interface and a pressure sensor interface in the standard chamber bottom, gas source interface is connected with high-pressure air source with the source of the gas operation valve by the source of the gas pipe, bottom or all sides in standard chamber are provided with the interface of giving vent to anger, be connected respectively with two end connectors of clamper by tracheae, accompany rock core between two end connectors, periphery is with packing element, clamper uses bolt joint, rock core and packing element are tightly clamped, the air hole of two joints is close to the both ends of the surface of rock core, or the interface of giving vent to anger is provided with isolation valve and atmospheric valve by tracheae and core chamber's connection on the tracheae of connecting clamper or core chamber; Pressure sensor interface directly is connected with pressure transducer.
CN2009102299337A 2009-11-04 2009-11-04 Method and device for measuring rock core porosity by adopting constant pressure and variable volume method Expired - Fee Related CN101701898B (en)

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Application Number Priority Date Filing Date Title
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103018147B (en) * 2012-11-21 2015-09-09 中国石油大学(华东) A kind of method measuring total porosity of shale
CN103018153B (en) * 2012-12-25 2015-05-27 上海大学 Evaluation method for end part effects of seepage flow field
CN103674804A (en) * 2013-11-25 2014-03-26 河海大学 Device and method for measuring effective porosity of low-permeability rock on basis of inert gas experiment
CN107167407A (en) * 2016-03-07 2017-09-15 中国石油化工股份有限公司 A kind of rock porosity determines device
CN106501151B (en) * 2016-10-25 2019-04-26 中国科学院力学研究所 A kind of shale aperture measurement device and method based on imbibition and ion diffusion property

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