CN106777471A - Measurement envelope alters the analogue experiment installation and its measuring method of agent invaded formation depth - Google Patents
Measurement envelope alters the analogue experiment installation and its measuring method of agent invaded formation depth Download PDFInfo
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- CN106777471A CN106777471A CN201611009283.1A CN201611009283A CN106777471A CN 106777471 A CN106777471 A CN 106777471A CN 201611009283 A CN201611009283 A CN 201611009283A CN 106777471 A CN106777471 A CN 106777471A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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Abstract
Alter the analogue experiment installation of agent invaded formation depth the invention discloses a kind of envelope that measures, the analogue experiment installation include sleeve pipe in hollow cylindrical, be arranged on the kettle of cannula tip connection fixed thereto, be arranged on sleeve bottom for supporting fixed base, being arranged on sleeve pipe in along its axial arranged fill out sand tube, be arranged between kettle and fill out sand tube and be used to connecting both perforation tunnels, be arranged on the compression module that can be slided up and down along its axial direction in fill out sand tube and set on base for driving compression module jack in axial sliding.The present invention is pressurizeed by booster pump in kettle, and scene injection envelope alters the process of agent under the conditions of simulation different pressures and discharge capacity, and research injection pressure and discharge capacity alter the influence of agent depth of invasion to envelope, and the test result degree of accuracy is high.The invention also discloses the measuring method of this analogue experiment installation.
Description
Technical field
The present invention relates to technical field of oilfield chemistry, and in particular to a kind of measurement envelope alters the simulation reality of agent invaded formation depth
Experiment device, the invention further relates to the measuring method of this analogue experiment installation.
Background technology
With oil field development depth, the continuous extension of range gradually rises, particularly subdivision of reservoir to oil-water well quality requirement
The implementation of injection-production technology technology and the popularization of tertiary oil recovery technology and application, the improvement to altering groove between oil-water-layer are increasingly received
To attention.Oil-water well is exploited by prolonged, and deformation, damaged and leakage occurs in sleeve pipe, along with cementing quality is poor and long-term
The interlayer contradiction that water flooding recovery causes causes to alter groove phenomenon constantly aggravates, and what oil-water well altered groove, particularly multi-section multi-layer alters groove, can give
Oil well production and management bring serious harm, are mainly manifested in：One is that can not carry out separate zone production to multiple zone；Two is to make profit
Implementing in full for well increasing yield and injection measure is subject to certain restrictions, and has a strong impact on oil well and normally produces；Three is influence oil field development
Speed；Four is the service life for reducing oil-water well；Five is influence oil field ultimate recovery；Six are caused to workover treatment and management
Trouble, influences oil field development benefit.To reach the purpose of steady oil control water, the normal Development and Production in oil field, the envelope technology of altering is set to get over
It is valued by people to get over.
It is main at present to alter agent using to altering groove location and clamp-on envelope, effectively blocked to altering groove location, reduction alters groove to oil
The influence of gas well liquid loading.However, being found in work progress at the scene, according to water suction situation, the consumption design radial that envelope alters agent can
The maximum that repetition perforations adding perforating gun can be more than wears depth, perforations adding is repeated after causing envelope to be altered and penetrates impermeable, causes layer position to scrap.Therefore, have
Necessity sets up rational physical model, and envelope alters agent depth of invasion under the conditions of research Different Strata physical property and construction parameter, and analysis is not
Permeability together, temperature, displacement pressure and displacement velocity alter the influence of agent depth of invasion to envelope.The device successful design is to mould
Intend scene envelope to alter, construction technology is altered according to Different Strata physical property optimization scene envelope and construction parameter is significant.
The content of the invention
The first object of the present invention is to overcome the shortcomings of above-mentioned background technology, and provides a kind of measurement envelope and alter agent intrusively
The analogue experiment installation of layer depth.Analogue experiment installation of the invention is according to different physical parameters, construction parameter and thing
Mould experimental data establishes the forecast model that envelope alters agent depth of invasion, agent depth of invasion forecast model is altered by setting up envelope, to applying
The construction parameters such as work pressure, operational discharge capacity, construction consumption have carried out reasonably optimizing, and the depth of invasion of agent is altered to envelope in site operation
Carry out reasonable prediction, it is ensured that envelope alters agent depth of invasion ＜ 1m so that perforating gun can be shot through envelope and alter stratum.
The second object of the present invention is to provide the survey of the analogue experiment installation that this measurement envelope alters agent invaded formation depth
Amount method, the measuring method is simple and easy to apply, can simulate envelope and alter agent in perforation tunnel and the intrusion state of channel roof, more truly
Simulation sealing agent distribution and depth of invasion in the earth formation, be conducive to operation pressure, operational discharge capacity, construction consumption etc.
Construction parameter has carried out reasonably optimizing.
To realize the first purpose, measurement envelope of the invention alters the analogue experiment installation of agent invaded formation depth, including is in
The sleeve pipe of hollow round column shape, the kettle for being arranged on cannula tip connection fixed thereto, sleeve bottom is arranged on for being carried out to it
Fixed base is supported, is arranged in sleeve pipe along its axial arranged fill out sand tube, is arranged between kettle and fill out sand tube for connecting
Lead to both perforation tunnels, be arranged on the compression module and setting base that can be slided up and down along its axial direction in fill out sand tube and use
In driving compression module jack in axial sliding；
The top of the kettle is provided with the lid being tightly connected therewith, enclosed between the kettle and lid to be formed for
The accommodating chamber that envelope alters agent is accommodated, the accommodating chamber is connected by the first pipeline through lid with the booster pump in the external world；The set
Along its axially arranged fixed cover having for installing fixed fill out sand tube in pipe, enclosed between described sleeve pipe inwall and fixed cover outer wall
The pressure chamber for simulated formation pressure is formed, the pressure chamber is connected by the second pipeline with the ring press pump in the external world；
The fill out sand tube is top closure, the cylindrical tubular structure of open bottom end, the top insertion kettle of the fill out sand tube
Body bottom connection fixed thereto, the bottom of the fill out sand tube extends downwardly the bottom for passing sleeve pipe, and the compression module is inserted and filled out
The circumferential seal connection therewith of the bottom of sandpipe；The bottom of the jack is fixedly installed on base, telescopic end and the pressure at top
The bottom of contracting module is fixedly connected；
The top of the fixed cover is fixedly connected with autoclave body bottom, and the bottom of the fixed cover is fixed with sleeve bottom and connected
Connect, the inwall of the fixed cover is fitted with the outer wall of fill out sand tube；The fixed cover is the hollow cylindrical rubber being made up of rubber
Glue fixed cover.The heater for being heated to its inner chamber is arranged with the outer wall of described sleeve pipe.
In above-mentioned technical proposal, sealing ring is provided between the kettle and lid, the bottom of the kettle is provided with clearly
Through hole is washed, the cleaning through hole is blocked by dismountable plunger.
In above-mentioned technical proposal, the heater for being heated to its inner chamber is arranged with the outer wall of described sleeve pipe.
In above-mentioned technical proposal, the bottom of the jack is provided with the pressure gauge for showing its pressure value size.
In above-mentioned technical proposal, the heater is the ring shaped heating mechanism for being circumferentially positioned at sleeve outer wall.
In above-mentioned technical proposal, be connected portion and sleeve pipe and the portion that is connected of the second pipeline of the lid and the first pipeline
It is provided with snap joint.
To realize the second purpose, the present invention provides a kind of analogue experiment installation that agent invaded formation depth is altered using measurement envelope
The method for measuring, comprises the following steps：
1) empirically it is formulated after quartz sand is put into processes 8~16h in the thermostatic drying chamber that temperature is 102~110 DEG C, from
Room temperature so is cooled to, quartz sand is sufficiently mixed uniformly；
2) fill out sand tube is fitted into fixed cover, adjusts ring press pump, be forced into the pressure of experiment setting；
3) by step 1) well mixed quartz sand slowly pours into fill out sand tube and is compacted quartz sand with jack, complete
Into the making of sand-filling tube model；
4) heater is opened, the fill out sand tube in sleeve pipe is heated, regulation to experiment design temperature；
5) toward water is filled up in kettle, water phase permeability is measured, can be by adjusting the pressure change of jack in measurement process
The compaction of quartz sand in fill out sand tube, the permeability of experiment setting is reached with this；
6) according to experiment impose a condition configuration envelope alter agent slurry, the envelope that will be prepared is altered agent slurry and is poured slowly into kettle, use
Booster pump is forced into the pressure of experiment setting, remaining envelope is altered into agent slurry after the completion of displacement and is taken out, in the case where design temperature is tested
Wait solidifying 15~25h；
7) fill out sand tube is taken out and is opened, cleaning envelope alters the unimpinged sand body of agent slurry, measurement envelope alters the depth of invasion of agent,
.
In above-mentioned technical proposal, in the step 2) in, the pressure that experiment sets is 20~50MPa.
In above-mentioned technical proposal, in the step 4) in, experiment design temperature is 180~220 DEG C.
Compared with prior art, the invention has the advantages that：
First, the present invention is filled fill out sand tube using the quartz sand that different-grain diameter and different-grain diameter are distributed, and apply band
The jack for having precision pressure gauge is progressively compacted after the completion of back-up sand in sand tube internal procedure is filled out, and adds by water filling in kettle
Pressure, then the permeability of compacting dust devil is measured, measurement obtains the core column of different permeability energy, and the pressure that jack applies is filled out more greatly
The bigger permeability of husky density in sandpipe is smaller, and thus, the stratum simulation scene envelope that the device can be directed to different physical property is altered
Experiment.
Second, the present invention is during simulated formation is prepared, perforation tunnel is manufactured by true perforation, can be according to different
Perforating bullet diameter, manufactures corresponding perforation tunnel, and thus, the device can simulate envelope and alter agent in perforation tunnel and channel circumference top
The intrusion state in portion, more real simulation sealing agent distribution and depth of invasion in the earth formation.
Third, the present invention is designed with heating and pressue device simultaneously, operating temperature is up to 200 DEG C, and operating pressure is reachable
40MPa, therefore envelope under high-temperature and high-pressure conditions can be simulated alter process.
Fourth, the present invention can be pressurizeed by booster pump in kettle, scene under the conditions of simulation different pressures and discharge capacity
Injection envelope alters the process of agent, and research injection pressure and discharge capacity alter the influence of agent depth of invasion to envelope, and the test result degree of accuracy is high.
Fifth, obtaining and blocking under the conditions of present invention simulation Different Strata parameter, temperature, displacement pressure and displacement velocity
Journey, due to during closure is simulated, not only realizing the simulation of Different Strata parameter, while the perforation that have also been introduced simulation leads to
Road, therefore, the method for testing can simulate envelope and alter agent in perforation tunnel and the intrusion state of channel roof, more real simulation envelope
Blocking agent distribution and depth of invasion in the earth formation, is conducive to construction parameters such as operation pressure, operational discharge capacity, construction consumptions
Reasonably optimizing is carried out.
Brief description of the drawings
Fig. 1 is that the present invention is a kind of measures the structural representation that envelope alters the analogue experiment installation of agent invaded formation depth；
Wherein：1- sleeve pipes, 2- kettlies, 3- bases, 4- fill out sand tube, 5- perforation tunnels, 6- compression modules, 7- jack, 8-
Lid, 9- envelopes are altered agent, 10- accommodating chambers, the pipelines of 11- first, 12- booster pumps, 13- fixed covers, 14- pressure chambers, 15- second and are managed
Road, 16- ring press pumps, 17- sealing rings, 18- heaters, 19- plungers, 20- pressure gauges.
Specific embodiment
Performance of the invention is described in detail with reference to embodiment, but they do not constitute limitation of the invention,
It is only for example.Will become clearer and be readily appreciated that by illustrating advantages of the present invention simultaneously.
As shown in figure 1, a kind of measurement envelope of the invention alters the analogue experiment installation of agent invaded formation depth, including in hollow
The sleeve pipe 1 of cylindrical shape, the kettle 2 for being arranged on the connection fixed thereto of the top of sleeve pipe 1, the bottom of sleeve pipe 1 is arranged on for entering to it
Row supports fixed base 3, is arranged in sleeve pipe 1 along its axial arranged fill out sand tube 4, is arranged between kettle 2 and fill out sand tube 4
For connecting both perforation tunnels 5, being arranged on the compression module 6 and setting that can be slided up and down along its axial direction in fill out sand tube 4
It is used to drive jack 7 in axial sliding of compression module 6 on base 3；
The top of the kettle 2 is provided with the lid 8 being tightly connected therewith, encloses to be formed between the kettle 2 and lid 8
The accommodating chamber 10 of agent 9 is altered for accommodating envelope, the accommodating chamber 10 is by the first pipeline 11 and extraneous booster pump through lid 8
12 connections；Along its axially arranged fixed cover 13 having for installing fixed fill out sand tube 4 in described sleeve pipe 1, the inwall of described sleeve pipe 1 with
The pressure chamber 14 to be formed for simulated formation pressure is enclosed between the outer wall of fixed cover 13, the pressure chamber 14 passes through the second pipeline 15
It is connected with extraneous ring press pump 16.The present invention is filled fill out sand tube using the quartz sand that different-grain diameter and different-grain diameter are distributed,
And jack of the application with precision pressure gauge is progressively compacted after the completion of back-up sand in sand tube internal procedure is filled out, by kettle
Water filling is pressurizeed, then measures the permeability of compacting dust devil, and measurement obtains the core column of different permeability energy, the pressure that jack applies
The bigger permeability of husky density in bigger fill out sand tube is smaller, and thus, the stratum that the device can be directed to different physical property is simulated now
Field envelope alters experiment.
The fill out sand tube 4 is top closure, the cylindrical tubular structure of open bottom end, the top insertion of the fill out sand tube 4
The bottom of kettle 2 connection fixed thereto, the bottom of the fill out sand tube 4 extends downwardly the bottom for passing sleeve pipe 1, the compression module 6
The bottom circumferential seal connection therewith of fill out sand tube 4 is inserted, the bottom of the jack 7 is fixedly installed on the base 3, at the top of it
Telescopic end is fixedly connected with the bottom of compression module 6.The present invention is manufactured by true perforation and penetrated during simulated formation is prepared
Hole path, can manufacture corresponding perforation tunnel according to different perforating bullet diameters, and thus, the device can simulate envelope alters agent and penetrating
Intrusion state in hole path and at the top of channel circumference, it is more real to simulate sealing agent distribution in the earth formation and intrusion
Depth.
The top of the fixed cover 13 is fixedly connected with the bottom of kettle 2, and bottom and the bottom of sleeve pipe 1 of the fixed cover 13 are consolidated
Fixed connection, the inwall of the fixed cover 13 is fitted with the outer wall of fill out sand tube 4, and the fixed cover 13 is the hollow circle being made up of rubber
Post shapes rubber fixed cover.
Sealing ring 17 is provided between the kettle 2 and lid 8, is arranged with it on the outer wall of described sleeve pipe 1
The heater 18 that chamber is heated, the heater 18 is the ring shaped heating mechanism for being circumferentially positioned at the outer wall of sleeve pipe 1.It is described
The bottom of kettle 2 is provided with cleaning through hole.The present invention is designed with heating and pressue device simultaneously, and operating temperature is up to 200 DEG C, work
Make pressure up to 40MPa, therefore envelope under high-temperature and high-pressure conditions can be simulated to alter process.
The cleaning through hole is blocked by dismountable plunger 19, and the bottom of the jack 7 is provided with for showing it
The pressure gauge 20 of pressure value size.The phase of the lid 8 and be connected portion and the pipeline 15 of sleeve pipe 1 and second of the first pipeline 11
Portion of company is provided with snap joint.The present invention can be pressurizeed by booster pump in kettle, simulate different pressures and discharge capacity bar
Scene injection envelope alters the process of agent under part, and research injection pressure and discharge capacity alter the influence of agent depth of invasion to envelope, and test result is accurate
Exactness is high.
The present invention is a kind of to alter the method that the analogue experiment installation of agent invaded formation depth is measured using above-mentioned measurement envelope,
Comprise the following steps：
1) empirically it is formulated after quartz sand is put into processes 8~16h in the thermostatic drying chamber that temperature is 102~110 DEG C, from
Room temperature so is cooled to, quartz sand is sufficiently mixed uniformly；
2) fill out sand tube 4 is fitted into fixed cover 13, adjust ring press pump 16, be forced into experiment setting pressure (20~
50MPa)；
3) by step 1) well mixed quartz sand slowly pours into fill out sand tube 4 and is compacted quartz sand with jack 7,
Complete the making of the model of fill out sand tube 4；
4) heater 18 is opened, the fill out sand tube 4 in sleeve pipe 1 is heated, regulation to experiment design temperature (180~
220℃)；
5) water is filled up toward kettle 2 is interior, measures water phase permeability, can changed by adjusting the pressure of jack 7 in measurement process
Become the compaction of quartz sand in fill out sand tube 4, the permeability of experiment setting is reached with this；
6) according to experiment impose a condition configuration envelope alter the slurry of agent 9, the envelope that will be prepared is altered the slurry of agent 9 and is poured slowly into kettle 2,
The pressure of experiment setting is forced into booster pump 12, remaining envelope is altered into the slurry of agent 9 after the completion of displacement and is taken out, in experiment setting temperature
Degree is lower to wait solidifying 15~25h；
7) fill out sand tube 4 is taken out and is opened, cleaning envelope alters the unimpinged sand body of the slurry of agent 9, measurement envelope alters the intrusion depth of agent 9
Degree, you can.
Measuring method of the invention can be simulated under the conditions of Different Strata parameter, temperature, displacement pressure and displacement velocity
Obtain and block process.Due to during closure is simulated, the simulation of Different Strata parameter not only being realized, while have also been introduced mould
The perforation tunnel of plan, therefore, the method can simulate envelope and alter agent in perforation tunnel and the intrusion state of channel roof, more really
Simulation sealing agent distribution and depth of invasion in the earth formation, is conducive to applying operation pressure, operational discharge capacity, construction consumption etc.
Work parameter has carried out reasonably optimizing.
The content that this specification is not described in detail belongs to prior art known to professional and technical personnel in the field.
Claims (9)
- It is 1. a kind of to measure the analogue experiment installation that envelope alters agent invaded formation depth, it is characterised in that：Including in hollow cylindrical Sleeve pipe (1), be arranged on the kettle (2) of sleeve pipe (1) top connection fixed thereto, be arranged on sleeve pipe (1) bottom for entering to it Row supports fixed base (3), is arranged in sleeve pipe (1) along its axial arranged fill out sand tube (4), is arranged on kettle (2) and fills out It is used to connect both perforation tunnels (5) between sandpipe (4), is arranged on the pressure that can be slided up and down along its axial direction in fill out sand tube (4) For driving compression module (6) jack (7) in axial sliding in contracting module (6) and setting base (3)；The top of the kettle (2) is provided with the lid (8) being tightly connected therewith, is enclosed between the kettle (2) and lid (8) The accommodating chamber (10) that agent (9) are altered for accommodating envelope is formed, the accommodating chamber (10) is by the first pipeline (11) through lid (8) It is connected with extraneous booster pump (12)；Along its axially arranged fixation having for installing fixed fill out sand tube (4) in described sleeve pipe (1) Set (13), the pressure chamber to be formed for simulated formation pressure is enclosed between described sleeve pipe (1) inwall and fixed cover (13) outer wall (14), the pressure chamber (14) is connected by the second pipeline (15) with the ring press pump (16) in the external world；The fill out sand tube (4) is top closure, the cylindrical tubular structure of open bottom end, the top insertion of the fill out sand tube (4) Kettle (2) bottom connection fixed thereto, the bottom of the fill out sand tube (4) extends downwardly the bottom for passing sleeve pipe (1), the compression Module (6) inserts the bottom circumferential seal connection therewith of fill out sand tube (4)；The bottom of the jack (7) is fixedly installed on base (3) on, the telescopic end at top is fixedly connected with the bottom of compression module (6)；The top of the fixed cover (13) is fixedly connected with kettle (2) bottom, bottom and sleeve pipe (1) bottom of the fixed cover (13) Portion is fixedly connected, and the inwall of the fixed cover (13) is fitted with the outer wall of fill out sand tube (4)；The fixed cover (13) is by rubber system Into hollow cylindrical rubber fixed cover；It is arranged with the outer wall of described sleeve pipe (1) for adding for being heated to its inner chamber Thermal (18).
- 2. measurement envelope according to claim 1 alters the analogue experiment installation of agent invaded formation depth, it is characterised in that：It is described Sealing ring (17) is provided between kettle (2) and lid (8).
- 3. measurement envelope according to claim 1 alters the analogue experiment installation of agent invaded formation depth, it is characterised in that：It is described Heater (18) is to be circumferentially positioned at the ring shaped heating mechanism of sleeve pipe (1) outer wall.
- 4. measurement envelope according to claim 1 and 2 alters the analogue experiment installation of agent invaded formation depth, it is characterised in that： The bottom of the kettle (2) is provided with cleaning through hole, and the cleaning through hole is blocked by dismountable plunger (19).
- 5. measurement envelope according to claim 3 alters the analogue experiment installation of agent invaded formation depth, it is characterised in that：It is described The bottom of jack (7) is provided with the pressure gauge (20) for showing its pressure value size.
- 6. measurement envelope according to claim 1 alters the analogue experiment installation of agent invaded formation depth, it is characterised in that：It is described Lid (8) and the first pipeline (11) be connected portion and sleeve pipe (1) is provided with the portion of being connected of the second pipeline (15) and quickly connects Head.
- 7. measure envelope described in a kind of utilization claim 1~6 any one and alter the analogue experiment installation of agent invaded formation depth The method of row measurement, it is characterised in that comprise the following steps：1) empirically it is formulated after quartz sand is put into processes 8~16h in the thermostatic drying chamber that temperature is 102~110 DEG C, it is naturally cold But to room temperature, quartz sand is sufficiently mixed uniformly；2) fill out sand tube (4) is fitted into fixed cover (13), regulation ring press pump (16) is forced into the pressure of experiment setting；3) by step 1) well mixed quartz sand slowly pours into fill out sand tube (4) and is compacted quartz sand with jack (7), Complete the making of fill out sand tube (4) model；4) heater (18) is opened, the fill out sand tube (4) in sleeve pipe (1) is heated, regulation to experiment design temperature；5) water is filled up toward kettle (2) is interior, measures water phase permeability, can changed by adjusting the pressure of jack (7) in measurement process Become the compaction of fill out sand tube (4) interior quartz sand, the permeability of experiment setting is reached with this；6) according to experiment impose a condition configuration envelope alter agent (9) slurry, the envelope that will be prepared is altered agent (9) slurry and is poured slowly into kettle (2) It is interior, the pressure of experiment setting is forced into booster pump (12), remaining envelope is altered into agent (9) slurry after the completion of displacement and is taken out, in reality Test the solidifying 15~25h of time under design temperature；7) fill out sand tube (4) is taken out and is opened, cleaning envelope alters the unimpinged sand body of agent (9) slurry, measurement envelope alters the intrusion of agent (9) Depth, you can.
- 8. measurement envelope alters the method that the analogue experiment installation of agent invaded formation depth is measured according to claim 7, its It is characterised by, in the step 2) in, the pressure that experiment sets is 20~50MPa.
- 9. measurement envelope alters the method that the analogue experiment installation of agent invaded formation depth is measured according to claim 7, its It is characterised by, in the step 4) in, experiment design temperature is 180~220 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611009283.1A CN106777471A (en) | 2016-11-16 | 2016-11-16 | Measurement envelope alters the analogue experiment installation and its measuring method of agent invaded formation depth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611009283.1A CN106777471A (en) | 2016-11-16 | 2016-11-16 | Measurement envelope alters the analogue experiment installation and its measuring method of agent invaded formation depth |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111155991A (en) * | 2020-02-25 | 2020-05-15 | 东北石油大学 | Separable double-layer pressure-resistant sand filling pipe for simulating interlayer cementation poor stratum and simulation method |
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| EP1818999A1 (en) * | 2004-12-02 | 2007-08-15 | Chung Pak Battery Works Ltd., | A button-shaped alkaline battery |
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| 付美龙 等: "GX-1型触变性封窜剂地层侵入性研究", 《含氟三防织物、皮革、纸张整理剂技术市场国际研讨会、中国氟硅协会氟硅涂层专业委员会研讨会、全国工业表面活性剂发展研讨会暨中国油田化学品协会年会》 * |
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| CN111155991A (en) * | 2020-02-25 | 2020-05-15 | 东北石油大学 | Separable double-layer pressure-resistant sand filling pipe for simulating interlayer cementation poor stratum and simulation method |
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Application publication date: 20170531 |