CN107576573A - A kind of compact rock core microcrack development detection means and method - Google Patents

A kind of compact rock core microcrack development detection means and method Download PDF

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Publication number
CN107576573A
CN107576573A CN201710867369.6A CN201710867369A CN107576573A CN 107576573 A CN107576573 A CN 107576573A CN 201710867369 A CN201710867369 A CN 201710867369A CN 107576573 A CN107576573 A CN 107576573A
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CN
China
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plug
rock core
microcrack
clamper
interface
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CN201710867369.6A
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Chinese (zh)
Inventor
龙运前
陈立桥
于晓明
余璇
宋付权
黄小荷
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浙江海洋大学
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Priority to CN201710867369.6A priority Critical patent/CN107576573A/en
Publication of CN107576573A publication Critical patent/CN107576573A/en

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Abstract

A kind of compact rock core microcrack development detection means and method, described detection means includes triaxial core clamper, confined pressure pressue device, axial compressive force pressue device, strain detection testing device and microcrack ultrasonic inspection system, described confined pressure pressue device includes first container of connection, single cylinder piston pump with the first precision pressure gauge, the single cylinder piston pump accesses the confined pressure chamber interface of the triaxial core clamper, and the rock core to being clamped in triaxial core clamper applies confined pressure;Described axial compressive force pressue device includes a connection second container, hand pump with the second precision pressure gauge, and the hand pump accesses the axle pressure chamber interface of the triaxial core clamper, and the rock core to being clamped in triaxial core clamper applies axial compressive force;Described strain detection testing device includes the strain gauge main frame that an one end connects the first computer, the foil gauge that other end connection is placed in triaxial core clamper both ends.

Description

A kind of compact rock core microcrack development detection means and method

Technical field

The present invention relates to a kind of compact rock core microcrack development detection means and method, compact rock core microcrack can detect Evolved stages feature, relation of the reflection rock core between by stress deformation and microcrack development, belongs to oil-gas field development technical field.

Background technology

Tight sand gas reservoir enriches in China's type, and it is distributed in terrestrial facies, marine facies and transitional facies stratum. The high-quality reservoir being distributed in flakes can be still formed when buried depth of strata is more than 7000m, such as storehouse car foreland basin carat Soviet Union structural belt Cretaceous System Ba Shijiqike group ultra deep tight sandstone reservoirs;The Erdos and four of production is built for having been carried out scale at present For the tight sand gas reservoir of river basin, it is respectively formed under weak construction and complicated structure evolution background condition;Relative to routine For reservoir, tight sandstone reservoir has stronger an anisotropism and anisotropy, and FRACTURE CHARACTERISTICS is increasingly complex.

, should be using " core observation statistics is mutually tied with well log interpretation for the particularity of compact sandstone gas Reservoir Fracture research Close ", " Seismic Reservoir Prediction with drilling well constraint be combined ", " macro-scale is combined with micro-scale ", " qualitative evaluation and quantitatively Sign is combined ", " data statistics is combined with computational methods ", the research meanses such as " experimental analysis is combined with numerical simulation ", Combine all kinds of evaluation methods and deeply dissect such Reservoir Fracture type, mineralizing evolution mechanism, fracture development Dominated Factors, crack hair Relation and gas controlled function between degree and Dominated Factors and air content are educated, system establishes tight sandstone reservoir different stage fracture development The quantification of interval and FRACTURE CHARACTERISTICS parameter characterizes, the quantification of development degree of micro cracks in oil characterizes, development degree of micro cracks in oil and master control because Quantitative math-model, cracking initiation evolution quantification sign, Prediction of Fracture Distribution standards system, development degree of micro cracks in oil between element with Coupled relation between waterpower seam, intrinsic fracture and stress, is to cause in quantitative relationship standard between gas-bearing property, control gas pattern and fracturing process Basic Evaluation method, thinking and the main research of close sandstone gas reservoir fracture evaluation;The research is to enriching China's densification sand Shale oil gas basic geological theory, promoting the exploration and development process of China's DAMAGE OF TIGHT SAND GAS RESERVOIRS has important guiding effect.

The content of the invention

It is an object of the invention to overcome the shortcomings of the prior art, and offer is a kind of easy to assembly, simple to operate;With Strain and the evolved stages feature and deformation behaviour of two kinds of means real-time dynamic monitoring compact rock core microcracks of ultrasonic wave, so as to anti- Reflect the compact rock core microcrack development detection means and method of rock core relation between by stress deformation and microcrack development.

To achieve these goals, the present invention uses following technical scheme:A kind of compact rock core microcrack development detection dress Put, it surpasses including triaxial core clamper, confined pressure pressue device, axial compressive force pressue device, strain detection testing device and microcrack Sonic test device, described described confined pressure pressue device include an import connect the first container, with the first accurate pressure The single cylinder piston pump of power table, the single cylinder piston pump access the triaxial core clamper by high pressure resistant pipeline and two-way switch Confined pressure chamber interface, and the rock core to being clamped in triaxial core clamper applies confined pressure;

Described axial compressive force pressue device includes a connection second container, hand pump with the second precision pressure gauge, should The axle that hand pump accesses the triaxial core clamper by high pressure resistant pipeline and two-way switch presses chamber interface, and to triaxial core The rock core clamped in clamper applies axial compressive force;

The strain that described strain detection testing device includes one end connect band and has the first computer of data acquisition and procession software is surveyed Instrument main frame is measured, the other end is connected the foil gauge being placed in triaxial core clamper both ends by data wire with data-interface;

Described microcrack ultrasonic inspection system includes the second computer that one end connect band has data acquisition and procession software Supersonic detector main frame, the other end is connected and is placed in rock core in triaxial core clamper respectively by data wire with data-interface The transmitting transducer and receive transducer of both sides.

As preferred:Described triaxial core clamper include clamper cylinder, rubber sleeve, front end plug, rear end plug, Front end interface pipe and base;Confined pressure chamber is formed between clamper cylinder inboard wall and rubber sleeve outer wall, has confined pressure on clamper cylinder Chamber interface;The rear portion outer wall of front end plug and rear end plug, the inwall of clamper cylinder front and back end are all helicitic texture, and front end is blocked up Head and rear end plug all can closely be screwed into clamper cylinder, and the front sealing of front end plug is incorporated into the front port of rubber sleeve, after The front sealing of end plug is incorporated into the rear port of rubber sleeve, is rock core placed cavity within rubber sleeve inwall;Front end plug rear portion Inwall has screw thread, can be screwed into front end interface pipe, and front end interface pipe rear portion is one section of sleeve pipe with helicitic texture, and centre has one The mobilizable sleeve pipe of section, front end is the plug with groove structure, is directly contacted with rock core front end, and ultrasonic wave is placed in groove The transmitting transducer of test device, it is connected by pipeline with microcrack ultrasonic inspection system, groove side and rock core on plug There is strain detecting interface on contact surface, be connected by pipeline with strain detection testing device, two pipelines are led inside front end interface pipe Extract;

As preferred:Described rear end plug is made up of screw plug, seal cap and back end interface pipe, and is completely fixed extremely, close Axle pressure chamber is formed between sealing cap and rear end plug, axle pressure chamber and confined pressure chamber are completely separated, it is ensured that the axial compressive force of application is remote Far above confined pressure, axle pressure chamber interface is located on the plug of rear end, and back end interface pipe front end is the movable plug with groove structure, Directly contacted with rock core rear end, the receive transducer of ultrasonic inspection system is placed in groove, pass through pipeline and microcrack ultrasound Ripple test device is connected, and the groove side on plug passes through pipeline and strain testing with having strain detecting interface on rock core contact surface Device is connected, and two pipelines come out from back end interface pipe internal traction;Whole triaxial core clamper is supported by base, can be placed on The desktop of horizontal plane is tested.

A kind of detection method that compact rock core microcrack development is carried out using the detection means, described detection method bag Include following steps:

Step 1:The compact rock core with microcrack is selected, radial strain piece is affixed on the rock core end face of rear end plug, and rear Strain detecting interface on end interface pipe plug is adjacent to, and axial strain piece is affixed on the rock core outer wall of front end plug, and preceding Strain detecting interface on the plug of end interface pipe is adjacent to, and rock core front and rear end is respectively with the transmitting transducer in groove and connecing Receive transducer to be adjacent to, tighten the front end plug, rear end plug and front end interface pipe of clamper;

Step 2:Open two-way switch, replaced the water drive in the first container into confined pressure chamber using single cylinder piston pump, to rock core plus Confined pressure is carried to 3MPa, and keeps confined pressure constant;Supersonic detector main frame and strain gauge main frame are opened, records ultrasonic wave ripple Fast, ultrasonic wave profile and strain radially, axially;

Step 3:Hand pump is opened, the water drive in second container is replaced to axle and pressed in chamber, gradually pressurizes, starts pair to axle pressure chamber Rock core carries out microcrack extension, be forced into 10 respectively, 20,30,40, after 50MPa, constant shaft pressure keeps constant, opens respectively super Sonic analyzer main frame and strain gauge main frame, measure and the ultrasonic wave under 5 groups of difference microcrack development expansion conditions of record Velocity of wave, ultrasonic wave profile and strain radially, axially;

Step 4:Close whole test device, draw axle pressure 0,10,20,30,40, the relation of 50MPa and ultrasonic velocity it is bent Line, the ultrasonic wave profile under axle pressure 0,10,20,30,40,50MPa is drawn, analyze the variation characteristic of ultrasonic wave profile, calculated every Individual ultrasonic wave area under a curve, the ultrasonic velocity and ultrasonic wave area under a curve when being then 0MPa using axle pressure is bases Standard, using microcrack degree of expansion=(The ultrasonic velocity when ultrasonic velocity of any axle pressure-axle pressure is 0MPa)× Ultrasonic velocity formula when 100%/axle pressure is 0MPa is calculated, and obtains characterizing the index parameter of microcrack extension;Paint respectively System radially, axially strains the relation curve with stress, analyzes the relation between microcrack degree of expansion and rock core deformation.

The beneficial effects of the invention are as follows:The present invention is easy to assembly, simple to operate;Strain and two kinds of means realities of ultrasonic wave can be used When dynamic monitoring compact rock core microcrack evolved stages feature and deformation behaviour;Rock core can be reflected by stress deformation and microcrack Relation between development.

Brief description of the drawings

Fig. 1 is the structural representation of test device of the present invention.

Label shown in figure is:1-the first container;2-single cylinder piston pump;3-the first precision pressure gauges;4th, 6-two Open up pass;5-second container;7-the second precision pressure gauges;8-hand pump;9-strain gauge main frame;10-the first electricity Brain;11-the second computers;12-supersonic detector main frame;13-rear end plug;14-clamper cylinder;15-receive transducing Device;16-base;17-rock core;18-rubber sleeve;19-transmitting transducer;20-front end plug;21-front end interface pipe.

Embodiment

Below by specific embodiments and the drawings, the present invention is further illustrated.Shown in Fig. 1, a kind of compact rock core is micro- Fracture development detection means, it includes triaxial core clamper, confined pressure pressue device, axial compressive force pressue device, strain testing Device and microcrack ultrasonic inspection system, described described confined pressure pressue device include an import connect the first container 1, Single cylinder piston pump 2 with the first precision pressure gauge 3, the single cylinder piston pump 2 pass through high pressure resistant pipeline and the access institute of two-way switch 4 The confined pressure chamber interface of triaxial core clamper is stated, and the rock core 17 to being clamped in triaxial core clamper applies confined pressure;

Described axial compressive force pressue device includes a connection second container 5, hand pump 8 with the second precision pressure gauge 7, The hand pump 8 presses chamber interface by the axle of high pressure resistant pipeline and the access triaxial core clamper of two-way switch 6, and to three axles The rock core 17 clamped in core holding unit applies axial compressive force;

Described strain detection testing device includes the strain that one end connect band has the first computer 10 of data acquisition and procession software Measuring instrument main frame 9, the other end are connected the foil gauge being placed in triaxial core clamper both ends by data wire with data-interface;

Described microcrack ultrasonic inspection system includes the second computer that one end connect band has data acquisition and procession software 11 supersonic detector main frame 12, the other end are connected and are placed in triaxial core clamper respectively by data wire with data-interface The transmitting transducer 19 and receive transducer 15 of the both sides of rock core 17.

Shown in figure, described triaxial core clamper include clamper cylinder 14, rubber sleeve 18, front end plug 20, after Hold plug 13, front end interface pipe 21 and base 16;Confined pressure chamber, folder are formed between the inwall of clamper cylinder 14 and the outer wall of rubber sleeve 18 There is confined pressure chamber interface on holder cylinder 14;The rear portion outer wall of front end plug 20 and rear end plug 13, the front and back end of clamper cylinder 14 Inwall be all helicitic texture, front end plug 20 and rear end plug 13 all can closely be screwed into clamper cylinder 14, front end plug 20 Front sealing be incorporated into the front port of rubber sleeve 18, the front sealing of rear end plug 13 is incorporated into the rear port of rubber sleeve 18, It is the placed cavity of rock core 17 within the inwall of rubber sleeve 18;The rear inside wall of front end plug 20 has screw thread, can be screwed into front end interface pipe 21, The rear portion of front end interface pipe 21 is one section of sleeve pipe with helicitic texture, and there is one section of mobilizable sleeve pipe centre, front end be with The plug of groove structure, directly contacted with the front end of rock core 17, the transmitting transducer 19 of ultrasonic inspection system is placed in groove, led to Cross pipeline with microcrack ultrasonic inspection system to be connected, have strain detecting interface on the groove side on plug and rock core contact surface, It is connected by pipeline with strain detection testing device, two pipelines come out from the internal traction of front end interface pipe 21;

Rear end plug 13 of the present invention is made up of screw plug, seal cap and back end interface pipe, and is completely fixed dead, sealing Axle pressure chamber is formed between cap and rear end plug 13, axle pressure chamber and confined pressure chamber are completely separated, it is ensured that the axial compressive force of application is remote Far above confined pressure, axle pressure chamber interface is located on rear end plug 13, and back end interface pipe front end is movable stifled with groove structure Head, directly contacted with the rear end of rock core 17, the receive transducer 15 of ultrasonic inspection system is placed in groove, passes through pipeline and fine fisssure Seam ultrasonic inspection system is connected, and on rock core contact surface with there is strain detecting interface on the groove side on plug, by pipeline with answering Become test device to be connected, two pipelines come out from back end interface pipe internal traction;Whole triaxial core clamper is by base 16 Support, the desktop that can be placed on horizontal plane are tested.

A kind of detection method that compact rock core microcrack development is carried out using the detection means, described detection method bag Include following steps:

Step 1:The compact rock core with microcrack is selected, radial strain piece is affixed on the rock core end face of rear end plug, and rear Strain detecting interface on end interface pipe plug is adjacent to, and axial strain piece is affixed on the rock core outer wall of front end plug, and preceding Strain detecting interface on the plug of end interface pipe 21 is adjacent to, rock core front and rear end respectively with the transmitting transducer 19 in groove It is adjacent to receive transducer 15, tightens the front end plug 20, rear end plug 13 and front end interface pipe 21 of clamper;

Step 2:Two-way switch 4 is opened, is replaced the water drive in container 1 into confined pressure chamber using single cylinder piston pump 2, to rock core 17 Confined pressure is loaded to 3MPa, and keeps confined pressure constant;Supersonic detector main frame 12 and strain gauge main frame 9 are opened, record is super Acoustic velocity, ultrasonic wave profile and strain radially, axially;

Step 3:Hand pump 8 is opened, the water drive in container 5 is replaced to axle and pressed in chamber, gradually pressurizes, starts to rock to axle pressure chamber The heart 17 carries out microcrack extension, be forced into 10 respectively, 20,30,40, after 50MPa, constant shaft pressure keeps constant, opens respectively super Sonic analyzer main frame 12 and strain gauge main frame 9, measure and the ultrasound under 5 groups of difference microcrack development expansion conditions of record Ripple velocity of wave, ultrasonic wave profile and strain radially, axially;

Step 4:Close whole test device, draw axle pressure 0,10,20,30,40, the relation of 50MPa and ultrasonic velocity it is bent Line, the ultrasonic wave profile under axle pressure 0,10,20,30,40,50MPa is drawn, analyze the variation characteristic of ultrasonic wave profile, calculated every Individual ultrasonic wave area under a curve, the ultrasonic velocity and ultrasonic wave area under a curve when being then 0MPa using axle pressure is bases Standard, using microcrack degree of expansion=(The ultrasonic velocity when ultrasonic velocity of any axle pressure-axle pressure is 0MPa)× Ultrasonic velocity formula when 100%/axle pressure is 0MPa is calculated, and obtains characterizing the index parameter of microcrack extension;Paint respectively System radially, axially strains the relation curve with stress, analyzes the relation between microcrack degree of expansion and rock core deformation.

Embodiment described above is a kind of preferable scheme of the present invention, not the present invention is made any formal Limitation, there are other variants and remodeling on the premise of without departing from the technical scheme described in claim.

Claims (4)

1. a kind of compact rock core microcrack develops detection means, it includes triaxial core clamper, axially confined pressure pressue device, pressure Power pressue device, strain detection testing device and microcrack ultrasonic inspection system, it is characterised in that described described confined pressure pressurization Device includes an import and connects the first container(1), with the first precision pressure gauge(3)Single cylinder piston pump(2), single cylinder work Fill in pump(2)Switched by high pressure resistant pipeline and two-way(4)The confined pressure chamber interface of the triaxial core clamper is accessed, and to three axles The rock core clamped in core holding unit(17)Apply confined pressure;
Described axial compressive force pressue device includes a connection second container(5), with the second precision pressure gauge(7)It is hand Pump(8), the hand pump(8)Switched by high pressure resistant pipeline and two-way(6)The axle pressure chamber for accessing the triaxial core clamper connects Mouthful, and the rock core to being clamped in triaxial core clamper(17)Apply axial compressive force;
Described strain detection testing device includes the first computer that one end connect band has data acquisition and procession software(10)Should Become measuring instrument main frame(9), the other end be connected by data wire with data-interface be placed in triaxial core clamper both ends should Become piece;
Described microcrack ultrasonic inspection system includes the second computer that one end connect band has data acquisition and procession software (11)Supersonic detector main frame(12), the other end is connected respectively by data wire with data-interface is placed in triaxial core clamping Rock core in device(17)The transmitting transducer of both sides(19)And receive transducer(15).
2. compact rock core microcrack according to claim 1 develops detection means, it is characterised in that described triaxial core Clamper includes clamper cylinder(14), rubber sleeve(18), front end plug(20), rear end plug(13), front end interface pipe(21) And base(16);Clamper cylinder(14)Inwall and rubber sleeve(18)Confined pressure chamber, clamper cylinder are formed between outer wall(14)On There is confined pressure chamber interface;Front end plug(20)With rear end plug(13)Rear portion outer wall, clamper cylinder(14)The inwall of front and back end All it is helicitic texture, front end plug(20)With rear end plug(13)It all can closely be screwed into clamper cylinder(14), front end plug (20)Front sealing be incorporated into rubber sleeve(18)Front port, rear end plug(13)Front sealing be incorporated into rubber sleeve(18) Rear port, rubber sleeve(18)It is rock core within inwall(17)Placed cavity;Front end plug(20)Rear inside wall has screw thread, can twist Enter front end interface pipe(21), front end interface pipe(21)Rear portion be one section have helicitic texture sleeve pipe, centre have one section it is movable Sleeve pipe, front end is the plug with groove structure, with rock core(17)Front end is directly contacted, and ultrasonic test is placed in groove The transmitting transducer of device(19), it is connected by pipeline with microcrack ultrasonic inspection system, groove side and rock core on plug There is strain detecting interface on contact surface, be connected by pipeline with strain detection testing device, two pipelines are from front end interface pipe(21)It is interior Portion pulls out.
3. compact rock core microcrack according to claim 2 develops detection means, it is characterised in that described rear end plug (13)It is made up of screw plug, seal cap and back end interface pipe, and is completely fixed dead, seal cap and rear end plug(13)Between shape Chamber is pressed into axle, axle pressure chamber and confined pressure chamber are completely separated, it is ensured that the axial compressive force of application is significantly larger than confined pressure, axle pressure chamber interface Positioned at rear end plug(13)On, back end interface pipe front end is the movable plug with groove structure, with rock core(17)Rear end is straight Contact, the interior receive transducer for placing ultrasonic inspection system of groove(15), pass through pipeline and microcrack ultrasound trial assembly Put it is connected, groove side on plug with have strain detecting interface on rock core contact surface, be connected by pipeline with strain detection testing device, Two pipelines come out from back end interface pipe internal traction;Whole triaxial core clamper is by base(16)Support, can be placed on level The desktop in face is tested.
4. a kind of detection method that compact rock core microcrack development is carried out using 1 or 2 or 3 detection means of claim, its It is characterised by that described detection method comprises the following steps:
Step 1:The compact rock core with microcrack is selected, radial strain piece is affixed on the rock core end face of rear end plug, and rear Strain detecting interface on end interface pipe plug is adjacent to, and axial strain piece is affixed on the rock core outer wall of front end plug, and preceding End interface pipe(21)Plug on strain detecting interface be adjacent to, rock core front and rear end respectively with the transmitting transducer in groove (19)And receive transducer(15)It is adjacent to, tightens the front end plug of clamper(20), rear end plug(13)With front end interface pipe (21);
Step 2:Open two-way switch(4), utilize single cylinder piston pump(2)By container(1)In water drive replace into confined pressure chamber, give Rock core(17)Confined pressure is loaded to 3MPa, and keeps confined pressure constant;Open supersonic detector main frame(12)With strain gauge master Machine(9), record ultrasonic velocity, ultrasonic wave profile and strain radially, axially;
Step 3:Open hand pump(8), by container(5)In water drive replace to axle press chamber in, to axle pressure chamber gradually pressurize, start To rock core(17)Carry out microcrack extension, be forced into 10 respectively, 20,30,40, after 50MPa, constant shaft pressure keeps constant, respectively Open supersonic detector main frame(12)With strain gauge main frame(9), 5 groups of difference microcrack development extension bars of measurement and record Ultrasonic velocity, ultrasonic wave profile under part and strain radially, axially;
Step 4:Close whole test device, draw axle pressure 0,10,20,30,40, the relation of 50MPa and ultrasonic velocity it is bent Line, the ultrasonic wave profile under axle pressure 0,10,20,30,40,50MPa is drawn, analyze the variation characteristic of ultrasonic wave profile, calculated every Individual ultrasonic wave area under a curve, the ultrasonic velocity and ultrasonic wave area under a curve when being then 0MPa using axle pressure is bases Standard, using microcrack degree of expansion=(The ultrasonic velocity when ultrasonic velocity of any axle pressure-axle pressure is 0MPa)× Ultrasonic velocity formula when 100%/axle pressure is 0MPa is calculated, and obtains characterizing the index parameter of microcrack extension;Paint respectively System radially, axially strains the relation curve with stress, analyzes the relation between microcrack degree of expansion and rock core deformation.
CN201710867369.6A 2017-09-22 2017-09-22 A kind of compact rock core microcrack development detection means and method CN107576573A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110320569A (en) * 2018-03-30 2019-10-11 中国石油化工股份有限公司 A kind of tight sandstone reservoir individual well fracture development quantification of intensities evaluation method
CN110346449A (en) * 2019-05-24 2019-10-18 南通市中京机械有限公司 Sound wave clamper

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CN103245769A (en) * 2013-04-17 2013-08-14 中国石油天然气股份有限公司 Long core water injection test simulation system
CN103485762A (en) * 2012-06-08 2014-01-01 中国石油化工股份有限公司 Visual simulation shale micro-crack plugging capacity test system and method
CN104596905A (en) * 2014-12-31 2015-05-06 西南石油大学 Device and method for measuring permeability of rock in fracturing process
CN107063963A (en) * 2016-12-28 2017-08-18 浙江海洋大学 A kind of compact reservoir microcrack extension and the test device and method of seepage flow characteristics

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103485762A (en) * 2012-06-08 2014-01-01 中国石油化工股份有限公司 Visual simulation shale micro-crack plugging capacity test system and method
CN103245769A (en) * 2013-04-17 2013-08-14 中国石油天然气股份有限公司 Long core water injection test simulation system
CN104596905A (en) * 2014-12-31 2015-05-06 西南石油大学 Device and method for measuring permeability of rock in fracturing process
CN107063963A (en) * 2016-12-28 2017-08-18 浙江海洋大学 A kind of compact reservoir microcrack extension and the test device and method of seepage flow characteristics

Cited By (2)

* Cited by examiner, † Cited by third party
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CN110320569A (en) * 2018-03-30 2019-10-11 中国石油化工股份有限公司 A kind of tight sandstone reservoir individual well fracture development quantification of intensities evaluation method
CN110346449A (en) * 2019-05-24 2019-10-18 南通市中京机械有限公司 Sound wave clamper

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Application publication date: 20180112