CN105628578A - Device for evaluating water blocking and releasing properties of core - Google Patents

Device for evaluating water blocking and releasing properties of core Download PDF

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Publication number
CN105628578A
CN105628578A CN201510952005.9A CN201510952005A CN105628578A CN 105628578 A CN105628578 A CN 105628578A CN 201510952005 A CN201510952005 A CN 201510952005A CN 105628578 A CN105628578 A CN 105628578A
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CN
China
Prior art keywords
pressure
core
valve
holding unit
gas
Prior art date
Application number
CN201510952005.9A
Other languages
Chinese (zh)
Inventor
申颍浩
葛洪魁
李曹雄
任凯
杨志辉
宿帅
Original Assignee
中国石油大学(北京)
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Application filed by 中国石油大学(北京) filed Critical 中国石油大学(北京)
Priority to CN201510952005.9A priority Critical patent/CN105628578A/en
Publication of CN105628578A publication Critical patent/CN105628578A/en

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Classifications

    • 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
    • G01N15/082Investigating permeability by forcing a fluid through a sample

Abstract

The invention relates to a device for evaluating the water blocking and releasing properties of a core. The device characterized in that when a gas source valve is open, a nitrogen bottle serving as a gas source feeds nitrogen into a constant-pressure chamber, so that the constant-pressure chamber can keep pressure at the upstream constant relatively; a pressure difference sensor can precisely calculate a pressure difference between both ends of a core in a core clamp; when a water injection valve is open, a water injection pump injects deionized water into the left end of the core in the core clamp; a micro-flowmeter can measure gas flowing through the core; when a back pressure valve is open, a back pressure pump can apply back pressure to the core in the core clamp; a back pressure sensor can display a back pressure value; a downstream valve can control a connecting state between the right end of the core and the atmosphere. By the measurement of a change rule of the permeability of the core which is in contact with water along with the time, the aim of evaluating the water blocking capacity of the core can be fulfilled.

Description

A kind of rock core water lock releases merit rating device
Technical field
The invention belongs to oil-gas field development field, be specifically related to a kind of rock core water lock and release merit rating device.
Background technology
Along with the adjustment of energy resource structure and continually developing of unconventional energy resource, unconventional development of resources experience is also constantly ripe. Fracturing has played great function in nontraditional reservoir is developed. High with the conventional reservoir permeability that sandstone is representative, porosity is big, and pore throat character is relatively easy, and Rock Matrix dioxide-containing silica is high, and fracturing fluid can block gas flow channel after entering this rocks, forms water blocking damage. Therefore for conventional sandstone oil reservoir, the reinforcement row of returning is one of emphasis of research. But at unconventional reservoir, particularly in shale gas reservoir not only the micro-nano pores'growth of substrate and also containing a large amount of clay minerals, there is powerful capillary force and chemical potential, the phenomenon of the spontaneous entrance reservoir of fracturing fluid can not be ignored. This spontaneous imbibition effect mainly has two aspect mechanism, and one is that water lock releases mechanism, and two is microscopic displacement mechanism. It is the distinctive important mechanism of shale reservoir that water lock releases mechanism. When reservoir is implemented netted pressure break, a large amount of fracturing fluid can be filled with in microcrack, and then cause that shale gas flow channel is blocked. But, constantly extending over time, after the fracturing fluid in microcrack is absorbed by the complicated pore network in Rock Matrix and clay mineral, the hole blocked by fracturing fluid can realize water lock oneself gradually and release. Therefore, the ability evaluating the lock oneself's releasing of rock core water is extremely important. At present, do not have suitable instrument and the water lock solution removing solid capacity of rock core can be carried out quantitative assessment.
Summary of the invention
The technical problem to be solved is to provide a kind of rock core water lock and releases merit rating device, and this device is capable of rock core water is locked the quantitative assessment of ability.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is:
A kind of rock core water lock releases merit rating device, its structure includes nitrogen cylinder, source of the gas valve, constant voltage room, upstream pressure sensor, differential pressure pickup, downstream pressure sensor, valve downstream, Water filling valve, water injecting pump, core holding unit, confined pressure pressure transducer, confined pressure valve, confined pressure pump, micro-flowmeter, it is characterized in that, when source of the gas valve is opened, described nitrogen cylinder is filled with nitrogen as source of the gas to constant voltage room, described constant voltage room can keep upstream pressure relative constancy, described source of the gas valve controls the connected state of pipeline between nitrogen cylinder and constant voltage room, on described upstream pressure sensor pipeline between constant voltage room and core holding unit, the gas pressure in this depot siding can be measured, described differential pressure pickup two ends pipeline is connected with core holding unit two ends pipeline, rock core two ends gas pressure difference in energy accurate measurement core holding unit, described micro-flowmeter is positioned at core holding unit exit, the gas flow by rock core can be measured, described downstream pressure sensor is positioned on micro-flowmeter downstream line, the gas pressure in this depot siding can be measured, described valve downstream is positioned on downstream pressure sensor downstream line, water injecting pump outlet line there is Water filling valve, outlet line connects core holding unit left end, described water injecting pump can inject deionized water to the rock core left end in core holding unit, described confined pressure pump discharge pipeline is connected to core holding unit sidewall, confined pressure can be applied to the rock core in core holding unit, confined pressure pressure transducer and confined pressure valve are positioned on confined pressure pump discharge pipeline, wherein confined pressure pressure transducer can show confined pressure force value, confined pressure valve can control confined pressure pump discharge pipeline connected state.
The design principle of the present invention:
Water lock solves removing solid capacity after rock core is soaked by fracturing fluid specifically, the ability of resume permeability. In this experimental provision, source of the gas uses Nitrogen source gases. For ensureing rock core upstream extremity pressure relative constancy, use constant voltage room with the compressibility of buffer gas. And downstream and atmospheric pressure UNICOM, thus can guarantee that rock core two ends pressure reduction keeps relative stability. Consider the difference of certainty of measurement, use upstream pressure sensor and downstream pressure sensor reading when rock core upstream and downstream pressure differential is bigger, when two pressure sensor readings are basicly stable, then adopt high-precision differential pressure pickup reading. Micro-flowmeter can measure the volumetric flow of gas by rock core. According to Darcy's law, the permeability of rock core just can be calculated.
On this basis, water injecting pump is used to inject fracturing fluid to core chamber, Rock Matrix and fracturing fluid contact process in simulation fracturing process. Now due to the water-blocking effect of shale microcrack, core permeability can significantly reduce. Hereafter closing Water filling valve, Rock Matrix absorbs the fracturing fluid in crack gradually, and water-blocking effect can release gradually. Recording core permeability at set intervals, the water lock that just can evaluate rock core by studying permeability relation over time solves removing solid capacity.
Beneficial effects of the present invention:
Be can be seen that by above-mentioned principle design, a kind of rock core water provided by the invention lock release merit rating device can accurate evaluation rock core water lock solve removing solid capacity. And this device has the feature that technology is simple, feasibility good, be easily maintained.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of rock core water lock releasing merit rating device of the embodiment of the present invention 1. In figure: 1 nitrogen cylinder, 2 source of the gas valves, 3 constant voltage rooms, 4 upstream pressure sensors, 5 differential pressure pickups, 6 downstream pressure sensors, 7 valve downstreams, 8 Water filling valves, 9 water injecting pumps, 10 core holding units, 11 confined pressure pressure transducers, 12 confined pressure valves, 13 confined pressure pumps, 14 micro-flowmeters.
Detailed description of the invention
Embodiment 1
A kind of rock core water lock releases merit rating device, its structure includes nitrogen cylinder 1, source of the gas valve 2, constant voltage room 3, upstream pressure sensor 4, differential pressure pickup 5, downstream pressure sensor 6, valve downstream 7, Water filling valve 8, water injecting pump 9, core holding unit 10, confined pressure pressure transducer 11, confined pressure valve 12, confined pressure pump 13, micro-flowmeter 14, it is characterized in that, when source of the gas valve 2 is opened, described nitrogen cylinder 1 is filled with nitrogen as source of the gas to constant voltage room 3, described constant voltage room 3 can keep upstream pressure relative constancy, described source of the gas valve 2 controls the connected state of pipeline between nitrogen cylinder 1 and constant voltage room 3, on the described upstream pressure sensor 4 pipeline between constant voltage room 3 and core holding unit 10, the gas pressure in this depot siding can be measured, described differential pressure pickup 5 two ends pipeline is connected with core holding unit 10 two ends pipeline, rock core two ends gas pressure difference in energy accurate measurement core holding unit 10, described micro-flowmeter 14 is positioned at core holding unit 10 exit, the gas flow by rock core can be measured, described downstream pressure sensor 6 is positioned on micro-flowmeter 14 downstream line, the gas pressure in this depot siding can be measured, described valve downstream 7 is positioned on downstream pressure sensor 6 downstream line, water injecting pump 9 outlet line there is Water filling valve 8, outlet line connects core holding unit 10 left end, described water injecting pump 9 can inject deionized water to the rock core left end in core holding unit 10, described confined pressure pump 13 outlet line is connected to core holding unit 10 sidewall, confined pressure can be applied to the rock core in core holding unit 10, confined pressure pressure transducer 11 and confined pressure valve 12 are positioned on confined pressure pump 13 outlet line, wherein confined pressure pressure transducer 11 can show confined pressure force value, confined pressure valve 12 can control confined pressure pump 13 outlet line connected state.
The undeclared part related in the present invention is same as the prior art or adopts prior art to be realized.

Claims (1)

1. a rock core water lock releases merit rating device, its structure includes nitrogen cylinder (1), source of the gas valve (2), constant voltage room (3), upstream pressure sensor (4), differential pressure pickup (5), downstream pressure sensor (6), valve downstream (7), Water filling valve (8), water injecting pump (9), core holding unit (10), confined pressure pressure transducer (11), confined pressure valve (12), confined pressure pump (13), micro-flowmeter (14), it is characterized in that, described nitrogen cylinder (1) is filled with nitrogen as source of the gas to constant voltage room (3), described source of the gas valve (2) controls nitrogen cylinder (1) port of export pipeline connected state, described constant voltage room (3) can keep upstream pressure relative constancy, described source of the gas valve (2) controls the connected state of pipeline between nitrogen cylinder (1) and constant voltage room (3), described upstream pressure sensor (4) is positioned on the pipeline between constant voltage room (3) and core holding unit (10), the gas pressure in this depot siding can be measured, described differential pressure pickup (5) two ends pipeline is connected with core holding unit (10) two ends pipeline, energy accurate measurement core holding unit (10) interior rock core two ends gas pressure difference, described micro-flowmeter (14) is positioned at core holding unit (10) exit, the gas flow by rock core can be measured, described downstream pressure sensor (6) is positioned on micro-flowmeter (14) downstream line, the gas pressure in this depot siding can be measured, described valve downstream (7) is positioned on downstream pressure sensor (6) downstream line, water injecting pump (9) outlet line has Water filling valve (8), outlet line connects core holding unit (10) left end, described water injecting pump (9) can inject deionized water to the rock core left end in core holding unit (10), described confined pressure pump (13) outlet line is connected to core holding unit (10) sidewall, confined pressure can be applied to the rock core in core holding unit (10), confined pressure pressure transducer (11) and confined pressure valve (12) are positioned on confined pressure pump (13) outlet line, wherein confined pressure pressure transducer (11) can show confined pressure force value, confined pressure valve (12) can control confined pressure pump (13) outlet line connected state.
CN201510952005.9A 2015-12-21 2015-12-21 Device for evaluating water blocking and releasing properties of core CN105628578A (en)

Priority Applications (1)

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CN201510952005.9A CN105628578A (en) 2015-12-21 2015-12-21 Device for evaluating water blocking and releasing properties of core

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Application Number Priority Date Filing Date Title
CN201510952005.9A CN105628578A (en) 2015-12-21 2015-12-21 Device for evaluating water blocking and releasing properties of core

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CN105628578A true CN105628578A (en) 2016-06-01

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109115657A (en) * 2018-10-22 2019-01-01 中国石油大学(北京) The water lock that one species saturation couples detection with permeability releases merit rating device
CN109142163A (en) * 2018-10-22 2019-01-04 中国石油大学(北京) The water lock that one species saturation couples detection with permeability releases merit rating method
CN109387470A (en) * 2017-08-11 2019-02-26 北京大地高科地质勘查有限公司 A kind of matrix water-sensitive Effect Evaluation device

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CN102435537A (en) * 2011-11-21 2012-05-02 中国石油大学(华东) Measuring device for gas permeability of coal rock core
CN102507414A (en) * 2011-11-22 2012-06-20 中国石油天然气股份有限公司 Core permeability experimental testing method and device under condition of stratum pressure
CN202330233U (en) * 2011-11-22 2012-07-11 中国石油天然气股份有限公司 Experiment test device for permeability of rock core under condition of formation pressure
CN103558137A (en) * 2013-11-21 2014-02-05 中国科学院武汉岩土力学研究所 Device for measuring gas-water two-phase relative permeability of porous medium
CN103674800A (en) * 2012-09-03 2014-03-26 中国石油化工股份有限公司 Measuring method for permeability of low-permeability rock sample, and measuring device
CN103776745A (en) * 2012-10-22 2014-05-07 西安交大京盛科技发展有限公司 Testing device for rock permeability in exploitation of shale gas
CN103940719A (en) * 2014-04-15 2014-07-23 西安科技大学 Coal body permeability characteristic testing system and method
CN103954544A (en) * 2014-05-13 2014-07-30 中国石油大学(北京) Experimental device and method for estimating water-controlling and air-intake effects of polymer
CN104316449A (en) * 2014-11-05 2015-01-28 辽宁石油化工大学 Experimental method and experimental device for determinating volcanic gas-water relative permeability
CN104359819A (en) * 2014-11-10 2015-02-18 中国石油天然气股份有限公司 Device and method for determining gas-water relative permeability of low-infiltration dense rock core

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Publication number Priority date Publication date Assignee Title
CN102435537A (en) * 2011-11-21 2012-05-02 中国石油大学(华东) Measuring device for gas permeability of coal rock core
CN102507414A (en) * 2011-11-22 2012-06-20 中国石油天然气股份有限公司 Core permeability experimental testing method and device under condition of stratum pressure
CN202330233U (en) * 2011-11-22 2012-07-11 中国石油天然气股份有限公司 Experiment test device for permeability of rock core under condition of formation pressure
CN103674800A (en) * 2012-09-03 2014-03-26 中国石油化工股份有限公司 Measuring method for permeability of low-permeability rock sample, and measuring device
CN103776745A (en) * 2012-10-22 2014-05-07 西安交大京盛科技发展有限公司 Testing device for rock permeability in exploitation of shale gas
CN103558137A (en) * 2013-11-21 2014-02-05 中国科学院武汉岩土力学研究所 Device for measuring gas-water two-phase relative permeability of porous medium
CN103940719A (en) * 2014-04-15 2014-07-23 西安科技大学 Coal body permeability characteristic testing system and method
CN103954544A (en) * 2014-05-13 2014-07-30 中国石油大学(北京) Experimental device and method for estimating water-controlling and air-intake effects of polymer
CN104316449A (en) * 2014-11-05 2015-01-28 辽宁石油化工大学 Experimental method and experimental device for determinating volcanic gas-water relative permeability
CN104359819A (en) * 2014-11-10 2015-02-18 中国石油天然气股份有限公司 Device and method for determining gas-water relative permeability of low-infiltration dense rock core

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109387470A (en) * 2017-08-11 2019-02-26 北京大地高科地质勘查有限公司 A kind of matrix water-sensitive Effect Evaluation device
CN109115657A (en) * 2018-10-22 2019-01-01 中国石油大学(北京) The water lock that one species saturation couples detection with permeability releases merit rating device
CN109142163A (en) * 2018-10-22 2019-01-04 中国石油大学(北京) The water lock that one species saturation couples detection with permeability releases merit rating method

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Application publication date: 20160601