CN110161216A - A kind of device and method measuring rock core irreducible water saturation - Google Patents

A kind of device and method measuring rock core irreducible water saturation Download PDF

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Publication number
CN110161216A
CN110161216A CN201910527720.6A CN201910527720A CN110161216A CN 110161216 A CN110161216 A CN 110161216A CN 201910527720 A CN201910527720 A CN 201910527720A CN 110161216 A CN110161216 A CN 110161216A
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nitrogen
rock core
water
core
pump
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乐平
贾冰懿
雷涛
任广磊
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Southwest Petroleum University
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Southwest Petroleum University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/088Investigating volume, surface area, size or distribution of pores; Porosimetry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24Earth materials
    • G01N33/246Earth materials for water content
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
    • G01N5/02Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
    • G01N5/025Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a kind of device and methods for measuring rock core irreducible water saturation.The device is mainly made of source nitrogen, nitrogen humidifier, core holding unit, incubator, oil-water displacement pump, confining pressure pump, back pressure control pump, aerometer meter and level meter meter.Multiple nitrogen contact rings and nitrogen baffle are devised in the nitrogen humidifier, and nitrogen can be made to come into full contact with water and mixed.The core holding unit is placed in incubator, and the presence of paddle can make the temperature inside the box more uniform in incubator.The source nitrogen connects core holding unit arrival end with control valve by nitrogen humidifier respectively with oil-water displacement pump;The confining pressure pump connects core holding unit by confined pressure control valve, applies confining pressure to rock core;Outlet port of rock core holder connects back to voltage-controlled system pump, aerometer meter and level meter meter.The assay device structures that the present invention designs are reasonable, easy to operate, can effectively reduce evaluated error, using the device can Accurate Determining oil reservoir and gas reservoir rock core irreducible water saturation.

Description

A kind of device and method measuring rock core irreducible water saturation
Technical field
The present invention relates to a kind of device and methods of rock core saturation degree measurement, in particular to a kind of to be suitable for petroleum gas And the experimental provision and method of geology industry measurement rock core irreducible water saturation.
Background technique
Consider from oil-gas migration angle, when oil gas migrates to sandstone reservoir from source bed, since Oil, Water, Gas is to rock Wetting sex differernce and capillary force effect, the oil gas of migration can not go out the complete displacement of water in blowhole, meeting There is a certain amount of water to remain in blowhole.These water majorities are distributed and remain in rock particles contact position angle coupling micropore In gap or it is adsorbed on rock matrix particle surface.Due to special distribution and existence, this part of water does not flow almost , thus referred to as immobile water.Again since the presence of this part water and distribution are obviously influenced by solid property, so also referred to as Irreducible water or residual water, corresponding saturation degree are known as irreducible water saturation.
The size of the irreducible water saturation of reservoir is one of the physical parameter of oil reservoir log analysis and recovery process, be can be used for Evaluate the oil-water-layer of oil reservoir and the type of oil reservoir development process gas well output water;The seepage flow that can also be used for water-oil phase in stratum is special Sign analysis, productivity analysis, Production development analysis, numerical simulation, production system analysis, gas producing technology design and ground surface works are set Meter.
Conventional irreducible water saturation measurement device lacks gas source humidifying device, leads to gas source meeting during displacement rock core A small amount of moisture is adsorbed, measurement result deviation is caused.Present apparatus design has nitrogen humidifying device, and designs in blending tank multiple Contact ring and nitrogen baffle can be such that nitrogen comes into full contact with water and mix, and reduce measurement error.
Summary of the invention
The purpose of the present invention is to provide a kind of measurement devices of rock core irreducible water saturation, and the apparatus structure is reasonable, behaviour Make easy, hand can be gone up by simple training, can in Accurate Determining reservoir porous irreducible water saturation size.This hair Another bright is designed to provide the method using the irreducible water saturation in above-mentioned apparatus measurement reservoir core.
To achieve the above objectives, the present invention provides following technical scheme.
The measurement device of irreducible water saturation in a kind of reservoir core is mainly clamped by nitrogen pump, nitrogen humidifier, rock core Device, incubator, oil-water displacement pump, confining pressure pump, back pressure control pump, aerometer meter, level meter meter composition.It can satisfy difference Within the scope of temperature, pressure in reservoir core irreducible water saturation Accurate Determining.Data needed for the experiment test system acquisition and Processing system by high-precision temperature sensor, pressure sensor and can also be connected with the computer of data collecting card and form, with Further increase measurement accuracy.The core holding unit is placed in incubator, and the nitrogen pump connects rock by nitrogen humidifier Heart clamp holder arrival end has pressure gauge and nitrogen gas control valve, the grease between nitrogen humidifier and core holding unit arrival end Displacement pump connects core holding unit arrival end also by control valve;The confining pressure pump connects rock core clamping by confining pressure pump control valve Device applies confining pressure to rock core;Outlet port of rock core holder connects back to voltage-controlled system by control valve and pumps, and is separately connected gas dosing Meter and level meter meter.
Using above-mentioned apparatus measurement rock core irreducible water saturation method, successively the following steps are included:
1. measuring its porosity and permeability to dry rock core with core porosity and permeability measuring apparatus;
2. to the drying rock core vacuumizing for determining porosity and permeability and weighing;
3. being weighed to the rock core after saturation water flooding with precision balance;
4. the rock core weight after weighing subtracts the rock core weight vacuumized, the weight of the water flooding of saturation is determined;
5. the rock core of saturation water flooding is packed into core holding unit, then core holding unit is put into incubator;
6. incubator is warming up to test required temperature, while adding confining pressure to being higher than test core holding unit with confining pressure pump Maximum pressure 2MPa-3MPa or so, the back pressure of backpressure pump is set according to the minimum displacement pressure of test;
7. establishing displacement pressure appropriate by nitrogen humidifier and nitrogen gas control valve with nitrogen pump if it is gas reservoir rock core Difference, simulation gas migration Filling process injects nitrogen to core holding unit, with the pressure of back pressure valve regulation outlet port of rock core holder Power displaces some movable water in rock core, with level meter meter metering displace come water, until the surplus water in rock core reaches Irreducible water saturation under the pressure;
8. the survey for irreducible water saturation in oil reservoir rock can also be pumped by oil-water displacement if it is reservoir cores It is fixed;
9. according to level meter meter metering displace come water and sufficiently be saturated water flooding difference, calculate the beam under the pressure Tie up water saturation;
Compared with prior art, the invention has the following advantages:
The measurement device that the present invention designs, principle is reliable, structurally reasonable, easy to operate, can Accurate Determining using the device Irreducible water saturation in rock core.Multiple nitrogen contact rings and nitrogen baffle are devised in nitrogen humidifier, nitrogen can be made to fill with water Tap touching mixing.The presence of paddle can make the temperature inside the box more uniform in incubator.The present invention can both be injected by nitrogen Measurement of the system for irreducible water saturation in Gas Reservoir rock can also be pumped by oil-water displacement for beam in oil reservoir rock Tie up the measurement of water saturation.
Detailed description of the invention
Attached drawing 1 is the apparatus structure schematic diagram of measurement rock core irreducible water saturation provided by the invention;
Attached drawing 2 is nitrogen humidifier structural schematic diagram;
Attached drawing 3 is incubator and core holding unit structural schematic diagram;
It is as shown in the figure: 1- nitrogen pump;2- nitrogen humidifier;3- nitrogen injection control valve;4- pressure gauge;5- incubator;6- Core holding unit;7- oil-water displacement pump;8- control valve;9- flowmeter;10- confining pressure pump;11- confining pressure pump control valve;12- back pressure Pump;13- pressure gauge;14- back-pressure valve;15- aerometer meter;16- level meter meter;17- aerometer meter valve;18- liquid Quantifier valve;19- adds water storage tank;20- water inlet;21- is saturated nitrogen pipeline;22- nitrogen inlet;The contact of 23- nitrogen Circle;24- movable carriage;25- discharge outlet;26- humidometer;27- humidification nitrogen outlet;28- nitrogen baffle;The mixing of 29- nitrogen Tank;30- insulating layer;31- is saturated nitrogen gas control valve;32- driving motor;33- agitating shaft;34- paddle;35- heating rod;36- Rock core gum cover;37- gum cover end plug;38- gum cover end plug seal cap;39- cylinder cover;40- cylinder seal cap;41- core holding unit Cylinder.
Specific embodiment
With reference to the accompanying drawing, detailed elaboration is made to this specific embodiment of the invention.
Referring to Fig. 1: a kind of measurement device of rock core irreducible water saturation, mainly by nitrogen pump 1, nitrogen humidifier 2, rock core Clamper 6, oil-water displacement pump 7, confining pressure pump 10, backpressure pump 12, aerometer meter 15, level meter meter 16 form, the rock core Clamper 6 is placed in incubator 5.
The nitrogen pump 1 connects core holding unit arrival end valve by nitrogen humidifier 2, and nitrogen humidifier and rock core press from both sides There are the pressure gauge 4 and nitrogen injection valve 3 of different ranges between holder arrival end, the oil-water displacement pump 7 connects also by control valve 8 Connect core holding unit arrival end valve;The confining pressure pump 10 is connected to core holding unit 6 by ring pressure control valve, applies to rock core Confining pressure;Outlet port of rock core holder had both passed through back-pressure valve 14, connected backpressure pump 12, and was connected respectively by aerometer meter valve 18 Aerometer meter 15 is connect, level meter meter 16 is connected by level meter meter valve 18.
A kind of nitrogen humidifier, including add water storage tank 19, nitrogen blending tank 29, described plus water storage tank 19 passes through saturation nitrogen Pipeline 21 is connect with nitrogen blending tank 29, is equipped with nitrogen contact ring 23 inside described plus water storage tank 19, top be equipped with nitrogen into Port 22,29 inner wall of nitrogen blending tank are equipped with nitrogen baffle 28, are interspersed on the inner wall of nitrogen blending tank 29, the nitrogen 29 lower end of gas blending tank is equipped with another saturation nitrogen gas control valve 31;Humidometer 26 is installed at the top of the nitrogen blending tank 29, For monitoring nitrogen humidity after mixing;Described plus 19 top of water storage tank is successively arranged water inlet 20, saturation nitrogen tube from left to right Road 21;Saturation nitrogen after adding water enters nitrogen blending tank 29 by saturation nitrogen pipeline 21, and mixed nitrogen passes through 5 pieces Nitrogen baffle carries out secondary mixing, and the nitrogen for meeting technique requirement is finally delivered to what technique used through humidification nitrogen outlet 27 Place.
Its porosity and infiltration are measured to dry rock core with other core porosity and permeability measuring apparatus first Rate, then to the drying rock core vacuumizing for determining porosity and permeability and weigh, then the rock core after vacuumizing is put into full With water flooding is sufficiently saturated in device.It is weighed to the rock core of saturation water flooding with precision balance, subtracts the rock core weight vacuumized, Determine the water flooding weight of saturation;The rock core of saturation water flooding is packed into core holding unit 6, then core holding unit 6 is put into guarantor In incubator 5;Incubator 5 is warming up to test required temperature, while pumping 10 pairs of core holding units 6 plus confining pressure with confining pressure and surveying to being higher than The back pressure of backpressure pump 12 is arranged according to the minimum displacement pressure of test by maximum pressure 2MPa-3MPa of examination or so;If it is gas Rock core is hidden, establishes displacement pressure difference appropriate, simulation gas fortune by nitrogen humidifier 2 and saturation nitrogen gas control valve 31 with nitrogen pump It moves Filling process and injects nitrogen to core holding unit 6, the pressure of 6 outlet end of core holding unit is adjusted with back-pressure valve 14, displaces rock Some movable water in the heart, with level meter meter 16 measure displace come water, until the surplus water in rock core reaches the pressure Irreducible water saturation under power;If it is reservoir cores, 7 can also be pumped by oil-water displacement for irreducible water in oil reservoir rock The measurement of saturation degree, according to level meter meter metering displace come water and sufficiently be saturated water flooding difference, calculate the pressure Under irreducible water saturation.

Claims (6)

1. a kind of device for measuring rock core irreducible water saturation, mainly by source nitrogen, nitrogen humidifier, core holding unit, heat preservation Case, oil-water displacement pump, back pressure control pump, confining pressure control pump, aerometer meter and level meter meter composition.It is characterized in that, institute It states core holding unit to be placed in incubator, the nitrogen pump connects core holding unit arrival end by nitrogen humidifier, and nitrogen increases There are pressure gauge and nitrogen gas control valve between wet device and core holding unit arrival end, the oil-water displacement pump is connected also by control valve Core holding unit arrival end;The confining pressure pump connects core holding unit by confining pressure pump control valve, applies confining pressure to rock core;Rock core Clamper outlet end connects back to voltage-controlled system by control valve and pumps, and is separately connected aerometer meter and level meter meter.
2. a kind of device for measuring rock core irreducible water saturation as described in claim 1, devised in the nitrogen humidifier Multiple nitrogen contact rings and nitrogen baffle can be such that nitrogen comes into full contact with water and mix.
Nitrogen 3. a kind of device for measuring rock core irreducible water saturation as described in claim 1, in the nitrogen humidifier The exterior design of blending tank has one layer of heat preservation layer.
4. a kind of device for measuring rock core irreducible water saturation as described in claim 1, design has stirring in the incubator Leaf can make the temperature inside the box more uniform.
5. a kind of device for measuring rock core irreducible water saturation as described in claim 1 can pass through oil if it is reservoir cores Measurement of the water drive for pump for irreducible water saturation in oil reservoir rock.
6. using a kind of device and method for measuring rock core irreducible water saturation described in claim 1, successively the following steps are included:
1. measuring its porosity and permeability to dry rock core with other core porosity and permeability measuring apparatus;
2. to the drying rock core vacuumizing for determining porosity and permeability and weighing;
3. being weighed to the rock core after saturation water flooding with precision balance;
4. the rock core weight after weighing subtracts the rock core weight vacuumized, the weight of the water flooding of saturation is determined;
5. the rock core of saturation water flooding is packed into core holding unit, then core holding unit is put into incubator;
6. incubator is warming up to test required temperature, while adding confining pressure to being higher than test most core holding unit with confining pressure pump Big pressure 2MPa-3MPa or so, the back pressure of backpressure pump is arranged according to the minimum displacement pressure of test;
7. establishing displacement pressure difference appropriate, mould by nitrogen humidifier and nitrogen gas control valve with nitrogen pump if it is gas reservoir rock core Quasi- gas migration Filling process injects nitrogen to core holding unit, with the pressure of back pressure valve regulation outlet port of rock core holder, drives Some movable water in rock core out, with level meter meter metering displace come water, until the surplus water in rock core reaches this Irreducible water saturation under pressure;
8. the measurement for irreducible water saturation in oil reservoir rock can also be pumped by oil-water displacement if it is reservoir cores;
9. according to level meter meter metering displace come water and sufficiently be saturated water flooding difference, calculate the irreducible water under the pressure Saturation degree.
CN201910527720.6A 2019-06-18 2019-06-18 A kind of device and method measuring rock core irreducible water saturation Pending CN110161216A (en)

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CN110470585A (en) * 2019-09-04 2019-11-19 西南石油大学 A kind of experiment test device and method of shale dynamic imbibition ability
CN110531052A (en) * 2019-09-17 2019-12-03 中国石油大学(华东) It is a kind of to cover pressure supercentrifuge high temperature and pressure core chamber and its bindiny mechanism for the measurement of rock core irreducible water saturation
CN110686952A (en) * 2019-11-05 2020-01-14 西南石油大学 Method for quickly establishing pressure storage layer of full-diameter rock core of tight gas reservoir
CN112683718A (en) * 2020-12-28 2021-04-20 重庆大学 Device and method for measuring content of soil combined water and permeability coefficient
CN112798494A (en) * 2021-02-01 2021-05-14 西南石油大学 Long core drying seepage experiment device and experiment method
CN113008941A (en) * 2021-02-02 2021-06-22 东北石油大学 Core holder for bedding joint development shale, resistivity tester and method

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CN106324217A (en) * 2016-08-22 2017-01-11 青岛海洋地质研究所 Miniature sample-based biological reef rock conventional physical property tester device
CN106525690A (en) * 2016-12-02 2017-03-22 中国石油天然气股份有限公司 Method for measuring gas-water relative permeability curve by tight sandstone steady-state method
CN107121374A (en) * 2017-05-24 2017-09-01 北京永瑞达科贸有限公司 Formation condition relative permeability determines device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110470585A (en) * 2019-09-04 2019-11-19 西南石油大学 A kind of experiment test device and method of shale dynamic imbibition ability
CN110531052A (en) * 2019-09-17 2019-12-03 中国石油大学(华东) It is a kind of to cover pressure supercentrifuge high temperature and pressure core chamber and its bindiny mechanism for the measurement of rock core irreducible water saturation
CN110686952A (en) * 2019-11-05 2020-01-14 西南石油大学 Method for quickly establishing pressure storage layer of full-diameter rock core of tight gas reservoir
CN112683718A (en) * 2020-12-28 2021-04-20 重庆大学 Device and method for measuring content of soil combined water and permeability coefficient
CN112683718B (en) * 2020-12-28 2022-02-18 重庆大学 Device and method for measuring content of soil combined water and permeability coefficient
CN112798494A (en) * 2021-02-01 2021-05-14 西南石油大学 Long core drying seepage experiment device and experiment method
CN113008941A (en) * 2021-02-02 2021-06-22 东北石油大学 Core holder for bedding joint development shale, resistivity tester and method
CN113008941B (en) * 2021-02-02 2021-09-07 东北石油大学 Method for testing saturation-resistance increase coefficient of bedding joint development shale

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