CN103592213A - Diversion acidizing experimental apparatus suitable for multiple permeability max-min ratios and evaluation method - Google Patents
Diversion acidizing experimental apparatus suitable for multiple permeability max-min ratios and evaluation method Download PDFInfo
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Abstract
The invention provides a diversion acidizing experimental apparatus suitable for multiple permeability max-min ratios and an evaluation method. The experimental apparatus comprises an injection system, a rock core clamping device, a simulation system, a metering system, and a data acquiring and processing system, wherein the injection system comprises a plurality of working solution storage devices which are arranged in parallel and an injection pipeline; an injection pump and a valve are arranged on the injection pipeline; the rock core clamping device comprises a plurality of rock core clampers which are arranged in a thermostat in parallel; the simulation system comprises a working solution flow control device, a temperature control device and an environment pressure control device; the metering system comprises a pressure sensor, a temperature sensor and an electronic scale; the data acquiring and processing system comprises a man-machine interaction device, a data processor and an execution unit. The diversion acidizing experimental apparatus can meet synchronous experiment demand of multiple rock cores, is particularly suitable for a long well-section diversion acidizing experiment or a temporary blocking steering acidizing experiment with strong anisotropism and large permeability max-min ratio, has the advantages of strong comparison of experimental conditions and results and high experimental efficiency on fracturing liquid optimization and reservoir sensitivity evaluation, and has wide application prospect.
Description
Technical field
the present invention relates to for oil-gas field development optimal design and acid solution field, specifically a kind of specialized equipment and evaluation method of evaluating shunting effect in oil gas field acidization such as preferably.
Background technology
Owing to can increasing substantially effect of increasing production and hydrocarbon-bearing pool recovery ratio, in the whole world, each oil gas field obtains application (in being included in carbonatite, horizontal well drilling is developed) more and more widely to horizontal well technology.But horizontal well is because well segment length, the reaction of sour rock and filtration rate are difficult to obtain specific aim transformation soon.The possible result of conventional acidifying is relatively more to need the low porosity and low permeability band of transformation not obtain enough acid and effect of increasing production is poor, and only need a small amount of acid solution in high hole and microfracture development belt may transform excessively, affect borehole wall stability.This situation need to adopt distributary acid technology conventionally, and how very important to acidizing effect and follow-up safety in production by laboratory experiment prior appraisal suitable acid solution or acidifying starting material.
Conventional acidifying experimental provision only designs a core holding unit conventionally, can only carry out single rock core flowing experiment, and be difficult to while carrying out contrast experiment guarantee and the term harmonization such as the infusion pressure of testing above, flow, result contrast property is not strong, can not meet shunting and turn to acidifying experimental evaluation needs.
Summary of the invention
The object of the invention is: a kind of many permeability grade distributary acid experimental provision and evaluation method are provided, once can carry out a plurality of acidifying flowing experiments with the rock core of different permeabilities, solve the difficult problem to the optimization of long well section distributary acid and effect assessment in above-mentioned background technology.
The technical solution adopted in the present invention is:
Many permeability grade distributary acid experimental provision, comprises that injected system, core clamping device, simulation system, metering system and data Collection & Processing System form, concrete:
Injected system, comprises several working fluid storage devices that are arranged in parallel and injects pipeline, injects on pipeline and is provided with injection pump and valve;
Core clamping device, be arranged in constant temperature oven, several core holding units that are arranged in parallel, the inner clamping of core holding unit rock core, two ends arrange respectively the entrance and exit of working fluid, end, outlet that the entrance of all core holding units is connected to injection pipeline are provided with working fluid retracting device, and ring is pressed by pipeline abutment ring press liquid storage device and encircled press pump;
Simulation system, comprise working fluid volume control device, temperature control equipment and ring pressure control device, wherein: working fluid volume control device is the flow controlling unit of injection pump, temperature control equipment is the temperature control unit of constant temperature oven, and ring pressure control device is the flow controlling unit of ring press pump;
Metering system, comprises pressure transducer, temperature sensor and electronic balance, and wherein: pressure transducer is arranged on the porch of core holding unit, temperature sensor is arranged in constant temperature oven, and described working fluid retracting device is placed on electronic balance;
Data Collection & Processing System, comprise human-computer interaction device, data processor and performance element, data processor inside is provided with storage unit and counter, and the signal input part of data processor is connected with the signal output part of metering system, signal output part is connected with the signal input part of simulation system.
Valve on described injection pipeline is arranged on the atmospheric valve of working fluid storage device both sides.
The entrance of described core holding unit leads to and connects the end that injects pipeline by six, and is provided with controlled valve on six logical total interfaces.
The ring of described core holding unit presses porch to be provided with controlled valve.
Described core holding unit comprises clamper cylindrical shell and rock core plug, clamper cylindrical shell both ends open is provided with nut end cover, in nut end cover, be provided with the through hole inserting for rock core plug, in the nut end cover of core holding unit inlet end, be provided with axial-adjustment unit and the stop means of inlet end rock core plug, in the nut end cover of outlet port of rock core holder, be provided with the stop means of endpiece rock core plug.
The axial-adjustment unit of described inlet end rock core plug and stop means comprise spacing round platform, door shape framework and screw rod, described spacing round platform is arranged on the outer face of inlet end nut end cover, on spacing round platform, be provided with vertically the through hole inserting for inlet end rock core plug, screw rod and inlet end rock core plug coaxially arrange and interconnect, the end that is provided with corresponding screw flight hole, two side levers on the cross bar of door shape framework protrudes formation positioning key to the inside, and spacing round platform side face inwardly arranges a circle groove, a positioning key for shape framework is connected.
The stop means of described endpiece rock core plug comprises: the locating slot that the radially limited block arranging on endpiece rock core plug side face and endpiece nut end cover inner side coordinates with it, the through hole that described radially limited block is elongated, hold rock core plug to insert in endpiece nut end cover for export has and only have a direction to insert for limited block radially.
Described many permeability grade of adaptation distributary acid experimental evaluation method, comprises following concrete steps:
(1) the some blocks of rock cores with different permeability are respectively charged in different core holding units and by logical controlled valve and the ring of above-mentioned core holding unit front end six and press the controlled valve of porch to open;
(2) acid solution and local water are packed in different working fluid storage devices successively;
(3) select working fluid, log-on data collection and the disposal system of injecting core holding unit, by human-computer interaction device, input core parameters and experimental simulation parameter, core parameters comprises numbering, length, diameter, factor of porosity and the perm-plug method of rock core, experimental simulation parameter comprises the temperature of threshold values, working fluid flow and constant temperature oven that ring is pressed, the memory stores above-mentioned parameter of data Collection & Processing System inside, computing unit is reacted, to simulation system, is sent corresponding work order it;
(4) according to the setting value of simulation system, the flow controlling unit of injection pump regulates the uninterrupted of injection pump, to several core holding unit, injects acid solution or local water, simulated formation fluid state simultaneously; The uninterrupted of the flow controlling unit regulating ring press pump of ring press pump, the core holding unit while injection ring press liquid to several, applies circumferential pressure, clamping rock core to core holding unit; The temperature control unit of constant temperature oven is controlled constant temperature oven and is heated or lower the temperature;
(5) simultaneously, temperature sensor is monitored in real time and is gathered the temperature value in constant temperature oven and transfer to data Collection & Processing System, the pressure of pressure sensor monitoring core holding unit porch, electronic balance records after the liquid quality of outlet port of rock core holder, and above-mentioned real-time parameter is transferred to data Collection & Processing System, data Collection & Processing System by the permeability of rock core, and is made permeability correlation curve to a plurality of core experiments according to Darcy formula, timing ga(u)ge fluid operator;
(6) use acid solution or local water in working fluid storage device to replace successively the working fluid that injects core holding unit, repeating step (3)-(5), data Collection & Processing System is processed and is calculated all continuous datas, obtain each core permeability along with the change curve of time, filling liquid, intuitively reflect many permeability grade rock core acidizing effect under the same conditions.
The beneficial effect that the present invention produces is:
The present invention is with a plurality of core holding units, can meet a plurality of rock cores and test needs simultaneously, and can increase as required core holding unit, can test needs by a plurality of rock cores with different permeabilities of foot simultaneously, especially strong for nonuniformity, to have larger permeability grade long well section distributary acid or very applicable when stall is to acidifying experimental evaluation temporarily, for horizontal well long well section distributary acid design optimization and the acidifying optimal seeking of raw and processed materials provide strong support; And fracturing liquid preferably, also demonstrate experiment condition on reservoir sensitivity evaluation and result contrast property is strong, conventional efficient advantages of higher, application prospect is extensive.
The present invention is equipped with six-way valve at the parallel clamper injection side of placing between fluid reservoir endpiece, before experiment, alternative is opened different controlled valve connection fluid reservoir and core holding unit, not only can realize the Selective implantation of each liquid storage pot liquid, can also select different core holding units to realize single or multiple rock cores and test simultaneously.During work, by packing the rock core of different permeabilities in core holding unit into, from clamper inlet end with same pressure injection experiments fluid, at injection side setting pressure sensor, inlet pressure is monitored, and lay electronic balance in exit, by metering, record the flow rate calculation fluid of fluid through the permeability of rock core, and compare fluid to the acidizing effect of rock core or extent of injury, while occurring blocking up temporarily in distributary acid experimentation simultaneously, can close other controlled valves and select single rock core specific aim to carry out pressure breakthrough experiment.
Compared with prior art, tool of the present invention has the following advantages:
(1) with a plurality of core holding units, and can increase as required core holding unit, guarantee that core holding unit intake pressure is consistent, can carry out the permeability test experiments of a plurality of parallel rock cores simultaneously, improve conventional efficient, save manpower and time; Especially can meet well that nonuniformity is strong, the long well section distributary acid with larger permeability grade or temporarily stall to acidifying experimental evaluation needs.
(2) modular construction, line construction is simple, flow process is switched quick and convenient.Forward and reverse turn to change only need rotating clamp fastener or high pressure resistant modularization clamper carried out to quick release and connect, removal of core changes direction and packs into, whole process can complete in a few minutes.
(3) not only can evaluate acid solution distributary acid or temporarily stall to acidizing effect, also can carry out other flowing experiment (as fracturing liquid damage experiment, oil-gas field development " five is quick " experiment etc.), disposablely complete a plurality of experiments, experiment contrast property is strong, work efficiency is high.
(4) process control, data acquisition full-automation.By control program work out, high precision collecting disposal system allocation and optimization, experimentation has been realized full-automation.Experimental result both can show on same figure that each core permeability was along with the change curve of time, filling liquid automatically, also can on a figure, show that respectively each core permeability is along with the change curve of time, filling liquid, intuitively reflects many permeability grade rock core acidizing effect under the same conditions.
(5) newly-designed core holding unit compared with prior art: 1. taking up room and reduce, is before half; Holistic cost reduces, for before 60%; 2. can pass through rotary type hold-down nut rotating clamp fastener; 3. ring presses Injection Space to reduce in clamper, can pile faster and better rock core and add and hold ring and press; 4. reduced rock core gum cover length, rock core gum cover is difficult for deformed damaged, and in clamper, ring is pressed not easy-to-leak liquid; 5. select rotation fixed pin and rotation setting nut to be fixed rock core plug, good airproof performance, easy-to-leak liquid not, dismantle more convenient.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further illustrated:
Fig. 1 is structural representation of the present invention;
Fig. 2 is data acquisition of the present invention, control flow schematic diagram;
Fig. 3 is the structural representation of prior art core holding unit;
Fig. 4 is the structural representation of core holding unit of the present invention.
Number in the figure represents: 1-injection pump, 2-atmospheric valve, 3-working fluid storage device, 4-six is logical, 5-core holding unit, 6-encircles press pump, 7-working fluid retracting device, 8-pressure unit, 9-encircles press pump, 10-data Collection & Processing System, A-constant temperature oven, 11-extension bar, 12-travelling nut, 13-fixed pressure ring, 14-female connector, 15-O type circle, 16-clamper cylindrical shell, 17-gum cover, 18-rock core plug, 19-lock-screw, 20-movable drain plug, 21-is head nail only, the movable pressure ring of 22-, 23-set collar, 24-fixed head, 25-support bar, 26-base, the spacing round platform of 27-, 28-nut end cover, 29-trim ring, 30-hold-down nut, 31-door shape framework, 32-screw rod, the outlet of 33-clamper, 34-clamper entrance.
Embodiment
As shown in Fig. 1,2,4, the present invention is a kind of many permeability grade of adaptation distributary acid experimental provision, comprises that injected system, core clamping device, simulation system, metering system and data Collection & Processing System form, concrete:
Injected system, comprises several working fluid storage devices that are arranged in parallel 3 and injects pipeline, injects on pipeline and is provided with injection pump 1 and valve; In this embodiment, injection pump 1 is high pressure constant-flux pump (displacement pump), working fluid storage device 3 is acidproof fluid reservoirs, to inject valve on pipeline be acid-proof pipe valve member, be specifically arranged on working fluid storage device 3 both sides injects the atmospheric valve 2 on pipelines, the two ends of each working fluid storage device 3 are respectively arranged with the liquid in-out valve of liquid storage device 3, valve controlled pressure by fluid reservoir inlet transmits, and has packed-piston can guarantee constant-flux pump liquid and experimental liquid isolation out in the middle of fluid reservoir.Working fluid storage device 3 bottoms respectively carry switching control pilot door, can control flowing of experimental liquid in each flow container.
Core clamping device, is arranged in constant temperature oven A, several core holding units that are arranged in parallel 5, and the number of core holding unit 5 can in parallelly according to actual needs increase or reduce.The inner clamping rock core of core holding unit 5, two ends arrange respectively the entrance and exit of working fluid, and end, the outlet that the entrance of all core holding units 5 is connected to injection pipeline is respectively arranged with working fluid retracting device 7, ring is pressed by pipeline abutment ring press liquid storage device and encircles press pump 9.In this embodiment, core holding unit 5 is high pressure resistant modularization clampers, and the entrance of core holding unit 5 connects by six logical 4 the end that injects pipeline, and is provided with controlled valve on six logical 4 total interface.The ring that it should be noted that core holding unit 5 presses porch to be provided with controlled valve.
Simulation system, comprise working fluid volume control device, temperature control equipment and ring pressure control device, wherein: working fluid volume control device is the flow controlling unit of injection pump 1, temperature control equipment be constant temperature oven A temperature control unit, be generally the electrically heated rod being arranged in constant temperature oven A, ring pressure control device be ring press pump 9 flow controlling unit.In this embodiment, ring pressure control device is mutually to practice the pressure unit 8 of level, i.e. hydropress with ring press pump 9.
Metering system, comprises pressure transducer, temperature sensor and electronic balance, and wherein: pressure transducer is arranged on the porch of core holding unit 5, temperature sensor is arranged in constant temperature oven A, and working fluid retracting device 7 is placed on electronic balance.By electronic balance, record the working solution of collecting in working fluid retracting device 7, then by unit conversion, obtain working fluid and reclaim flow.
Data Collection & Processing System 10, for microcomputer control section, be generally computing machine, comprise human-computer interaction device, data processor and performance element, data processor inside is provided with storage unit and counter, and the signal input part of data processor is connected with the signal output part of metering system, signal output part is connected with the signal input part of simulation system.
The bright core holding unit of this law comprises clamper cylindrical shell 16 and rock core plug 18, clamper cylindrical shell 16 both ends opens are provided with nut end cover 28, in nut end cover 28, be provided with the through hole inserting for rock core plug 16, on the nut end cover 28-2 of core holding unit 16 inlet ends, be provided with axial-adjustment unit and the stop means of inlet end rock core plug 18-2, on the nut end cover 28-1 of core holding unit 16 endpiece, be provided with the stop means of endpiece rock core plug 18-1.
Concrete:
Axial-adjustment unit and the stop means of inlet end rock core plug 18-2 comprise: spacing round platform 27, door shape framework 31 and screw rod 32.Spacing round platform 27 is arranged on the outer face of inlet end nut end cover 28-2, on spacing round platform 27, be provided with vertically the through hole inserting for inlet end rock core plug 18-2, screw rod 32 coaxially arranges and interconnects with inlet end rock core plug 18-2, on the cross bar of door shape framework 31, be provided with the threaded hole of corresponding screw rod 32, the end of two side levers protrudes formation positioning key to the inside, spacing round platform 27 side faces inwardly arrange a circle groove, a positioning key for shape framework 31 is connected.
The stop means of endpiece rock core plug 18-1 comprises: the locating slot that the radially limited block 35 arranging on endpiece rock core plug 18-1 side face and endpiece nut end cover 28-1 inner side coordinates with it, the through hole that described radially limited block 35 is elongated, hold rock core plug 18-1 to insert on endpiece nut end cover 28-1 for export has and only have a direction to insert for limited block 35 radially.
Many permeability grade of adaptation distributary acid experimental evaluation method of the present invention, comprises following concrete steps:
(1) the some blocks of rock cores with different permeability are respectively charged into the high pressure resistant modularization clamper of different core holding unit 5() in and press the controlled valve of porch to open the controlled valve of above-mentioned core holding unit 5 front ends six logical 4 correspondences and ring;
(2) acid solution and local water (or simulated formation water) are packed in different working fluid storage devices 3 successively;
(3) select working fluid, log-on data collection and the disposal system of injecting core holding unit 5, by human-computer interaction device, input core parameters and experimental simulation parameter, core parameters comprises numbering, length, diameter, factor of porosity and the perm-plug method of rock core, experimental simulation parameter comprises the temperature of threshold values, working fluid flow and constant temperature oven that ring is pressed, the memory stores above-mentioned parameter of data Collection & Processing System inside, computing unit is reacted, to simulation system, is sent corresponding work order it;
(4) according to the setting value of simulation system, the flow controlling unit of injection pump 1 regulates the uninterrupted of injection pump 1, to several core holding unit 5, injects acid solution or local water, simulated formation fluid state simultaneously; The uninterrupted of the flow controlling unit regulating ring press pump 9 of ring press pump 9, to several 5 while of core holding unit injection ring press liquid, applies circumferential pressure, makes its clamping rock core core holding unit 5; The temperature control unit of constant temperature oven A is controlled constant temperature oven A and is heated or lower the temperature;
(5) simultaneously, temperature sensor is monitored in real time and is gathered the temperature value in constant temperature oven A and transfer to data Collection & Processing System, the pressure of pressure sensor monitoring core holding unit 5 porch, electronic balance records after the liquid quality of core holding unit 5 endpiece, and above-mentioned real-time parameter is transferred to data Collection & Processing System, data Collection & Processing System by the permeability of rock core, and is made permeability correlation curve to a plurality of core experiments according to Darcy formula, timing ga(u)ge fluid operator;
(6) use acid solution or local water in working fluid storage device to replace successively the working fluid that injects core holding unit 5, repeating step (3)-(5), data Collection & Processing System is processed and is calculated all continuous datas, obtain each core permeability along with the change curve of time, filling liquid, intuitively reflect many permeability grade rock core acidizing effect under the same conditions.
It should be noted that:
Before experiment, stable for guaranteeing displacement pressure, first by working fluid storage device 3(fluid reservoir) liquid in-out valve and 2 atmospheric valves 2 close, ring is pressed and is closed, other valve is all opened, opening injection pump 1(is constant-flux pump, also can be referred to as displacement pump) with local water, drain the air in pipeline, pipe valve.
During experiment, first open the working fluid storage device 3 liquid in-out valves that local water (or simulated formation water) is housed, open ring is pressed automatic tracking function, opens corresponding this on six logical 4 and tests the controlled valve of core holding unit used.Start computing machine, input experiment parameter and experiment stop condition, each core permeability K before test acidifying
i 1; Close the working fluid storage device 3 liquid in-out valves that local water (or simulated formation water) is housed, open the working fluid storage device 3 liquid in-out valves that acid solution is housed, each core permeability K during test acidifying
i 2; Close the working fluid storage device 3 liquid in-out valves that acid solution is housed, open the working fluid storage device 3 liquid in-out valves that local water (or simulated formation water) is housed, each core permeability K after test acidifying
i 3, according to permeability final change or permeability in time, the variation of filling liquid determines many permeability grade rock core distributary acid effect.
Also can continue to use acid solution and local water (or simulated formation water) to replace and repeat above step successively, computing machine is processed and is calculated data, obtain each core permeability along with the change curve of time, filling liquid, intuitively reflect many permeability grade rock core acidizing effect under the same conditions.
The present invention illustrates using method of the present invention with a specific embodiment:
Before carrying out the experiment of many permeability grade distributary acid, it is 25.4mm that the rock core with different permeabilities is made into diameter, the column that length is 38mm ± 2mm, and once the core sample length of experiment is as far as possible consistent.Rock core is carried out after saturated processing, the some blocks of rock cores with different permeability are packed in core holding unit 5 successively.To prepare ready acid solution and local water (or simulated formation water) and be respectively charged into the acidproof flow container of working fluid storage device 3() in.
Start computing machine, input experiment parameter,
First close the flow container liquid in-out valve that acid solution is housed, open the flow container liquid in-out valve that local water (or simulated formation water) is housed, injection pump 1(constant-flux pump) with lower than critical flow velocity simultaneously to each core holding unit 5 infusion local waters.Local water enters in core holding unit 5, simulated formation fluid state, electrically heated rod and hydropress simulated formation temperature and pressure, and the flow of Computer display metering system, pressure, temperature variation, all data transfer to computing machine by data acquisition board.Until permeability result stable (relative error is less than 5-10%) is determined the permeability K before each rock core acidifying
i 1(i=1-n, n is experiment rock core sum).
Close the flow container liquid in-out valve that local water (or simulated formation water) is housed, the flow container liquid in-out valve of acid solution is equipped with in unlatching, constant-flux pump with lower than critical flow velocity simultaneously to each core holding unit 5 infusion acid solutions, according to acidifying simulation, require design to drive acid time, each core permeability K while completing acidifying
i 2measure.
Again close the flow container liquid in-out valve that acid solution is housed, the flow container liquid in-out valve of local water (or simulated formation water) is equipped with in unlatching, constant-flux pump with lower than critical flow velocity simultaneously to each core holding unit 5 infusion local waters, until permeability result stable (relative error is less than 5-10%) is determined the permeability K before each rock core acidifying
i 3.
According to K
i 1with K
i 3variation can intuitively reflect different permeability rock cores and acid liquid reaction process acid treatment degree separately, for acid formula or acidification technique provide experiment, support.
Claims (8)
1. adapt to many permeability grade distributary acid experimental provision, it is characterized in that: comprise that injected system, core clamping device, simulation system, metering system and data Collection & Processing System form, concrete:
Injected system, comprises several working fluid storage devices that are arranged in parallel and injects pipeline, injects on pipeline and is provided with injection pump and valve;
Core clamping device, be arranged in constant temperature oven, several core holding units that are arranged in parallel, the inner clamping of core holding unit rock core, two ends arrange respectively the entrance and exit of working fluid, end, outlet that the entrance of all core holding units is connected to injection pipeline are provided with working fluid retracting device, and ring is pressed by pipeline abutment ring press liquid storage device and encircled press pump;
Simulation system, comprise working fluid volume control device, temperature control equipment and ring pressure control device, wherein: working fluid volume control device is the flow controlling unit of injection pump, temperature control equipment is the temperature control unit of constant temperature oven, and ring pressure control device is the flow controlling unit of ring press pump;
Metering system, comprises pressure transducer, temperature sensor and electronic balance, and wherein: pressure transducer is arranged on the porch of core holding unit, temperature sensor is arranged in constant temperature oven, and described working fluid retracting device is placed on electronic balance;
Data Collection & Processing System, comprise human-computer interaction device, data processor and performance element, data processor inside is provided with storage unit and counter, and the signal input part of data processor is connected with the signal output part of metering system, signal output part is connected with the signal input part of simulation system.
2. many permeability grade of adaptation distributary acid experimental provision according to claim 1, is characterized in that: the valve on described injection pipeline is arranged on the atmospheric valve of working fluid storage device both sides.
3. many permeability grade of adaptation distributary acid experimental provision according to claim 1, is characterized in that: the entrance of described core holding unit leads to and connects the end that injects pipeline by six, and is provided with controlled valve on six logical total interfaces.
4. many permeability grade of adaptation distributary acid experimental provision according to claim 1, is characterized in that: the ring of described core holding unit presses porch to be provided with controlled valve.
5. many permeability grade of adaptation distributary acid experimental provision according to claim 1, it is characterized in that: described core holding unit comprises clamper cylindrical shell and rock core plug, clamper cylindrical shell both ends open is provided with nut end cover, in nut end cover, be provided with the through hole inserting for rock core plug, in the nut end cover of core holding unit inlet end, be provided with axial-adjustment unit and the stop means of inlet end rock core plug, in the nut end cover of outlet port of rock core holder, be provided with the stop means of endpiece rock core plug.
6. many permeability grade of adaptation distributary acid experimental provision according to claim 5, it is characterized in that: axial-adjustment unit and the stop means of described inlet end rock core plug comprise spacing round platform, door shape framework and screw rod, described spacing round platform is arranged on the outer face of inlet end nut end cover, on spacing round platform, be provided with vertically the through hole inserting for inlet end rock core plug, screw rod and inlet end rock core plug coaxially arrange and interconnect, on the cross bar of door shape framework, be provided with corresponding screw flight hole, the end of two side levers protrudes formation positioning key to the inside, spacing round platform side face inwardly arranges a circle groove, a positioning key for shape framework is connected.
7. many permeability grade of adaptation distributary acid experimental provision according to claim 5, it is characterized in that: the stop means of described endpiece rock core plug comprises: the locating slot that the radially limited block arranging on endpiece rock core plug side face and endpiece nut end cover inner side coordinates with it, the through hole that described radially limited block is elongated, hold rock core plug to insert in endpiece nut end cover for export has and only have a direction to insert for limited block radially.
8. according to many permeability grade of the adaptation distributary acid experimental evaluation method described in any one in claim 1～7, it is characterized in that: comprise following concrete steps:
(1) the some blocks of rock cores with different permeability are respectively charged in different core holding units and by logical controlled valve and the ring of above-mentioned core holding unit front end six and press the controlled valve of porch to open;
(2) acid solution and local water are packed in different working fluid storage devices successively;
(3) select working fluid, log-on data collection and the disposal system of injecting core holding unit, by human-computer interaction device, input core parameters and experimental simulation parameter, core parameters comprises numbering, length, diameter, factor of porosity and the perm-plug method of rock core, experimental simulation parameter comprises the temperature of threshold values, working fluid flow and constant temperature oven that ring is pressed, the memory stores above-mentioned parameter of data Collection & Processing System inside, computing unit is reacted, to simulation system, is sent corresponding work order it;
(4) according to the setting value of simulation system, the flow controlling unit of injection pump regulates the uninterrupted of injection pump, to several core holding unit, injects acid solution or local water, simulated formation fluid state simultaneously; The uninterrupted of the flow controlling unit regulating ring press pump of ring press pump, the core holding unit while injection ring press liquid to several, applies circumferential pressure, clamping rock core to core holding unit; The temperature control unit of constant temperature oven is controlled constant temperature oven and is heated or lower the temperature;
(5) simultaneously, temperature sensor is monitored in real time and is gathered the temperature value in constant temperature oven and transfer to data Collection & Processing System, the pressure of pressure sensor monitoring core holding unit porch, electronic balance records after the liquid quality of outlet port of rock core holder, and above-mentioned real-time parameter is transferred to data Collection & Processing System, data Collection & Processing System by the permeability of rock core, and is made permeability correlation curve to a plurality of core experiments according to Darcy formula, timing ga(u)ge fluid operator;
(6) use acid solution or local water in working fluid storage device to replace successively the working fluid that injects core holding unit, repeating step (3)-(5), data Collection & Processing System is processed and is calculated all continuous datas, obtain each core permeability along with the change curve of time, filling liquid, intuitively reflect many permeability grade rock core acidizing effect under the same conditions.
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