CN111577236A - Multi-section fracturing seepage simulation device for compact oil reservoir horizontal well - Google Patents
Multi-section fracturing seepage simulation device for compact oil reservoir horizontal well Download PDFInfo
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- CN111577236A CN111577236A CN202010631644.6A CN202010631644A CN111577236A CN 111577236 A CN111577236 A CN 111577236A CN 202010631644 A CN202010631644 A CN 202010631644A CN 111577236 A CN111577236 A CN 111577236A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention relates to a multi-section fracturing seepage simulation device for a horizontal well of a tight oil reservoir, which comprises an oil storage tank, a valve, an injection pump, a pressure gauge, a simulation box body, a microcomputer, a display, an oil well pump, a flow meter, a liquid storage tank, a vertical section of the horizontal well, a rock core holder, a fracturing main crack, a horizontal section of the horizontal well, a flow meter, a pressure gauge, a fracturing secondary crack, an electric control switch, a natural crack, a connecting pipeline between matrixes, an injection pipeline, a heating sheet, a connecting pipeline, a reinforcing hole, a sealing sheet and a sealing groove. The method is characterized in that: the oil storage tank, the valve, the injection pump and the pressure gauge form an injection module of the device; the oil pump, the microcomputer and the display, the flow meter, the pressure gauge and the liquid storage tank form an output module of the device; the simulation box body is internally provided with a horizontal well vertical section, a horizontal well horizontal section, a fracturing main crack, a fracturing secondary crack, a natural crack, an inter-matrix connecting pipeline, a rock core holder, a flow meter, a pressure gauge, an electric control switch and a heating sheet.
Description
Technical Field
The invention relates to a multi-section fracturing seepage simulation device for a horizontal well of a tight oil reservoir, belonging to the field of seepage mechanics and enhanced recovery ratio in oil and gas field development engineering.
Background
The dense oil reservoir is a hot spot of recent research in the petroleum industry and is the medium strength for replacing a conventional reservoir to complement the world energy gap in the future. The tight oil reservoir refers to oil in a sandstone or carbonate reservoir with the overburden matrix permeability less than or equal to 0.1mD, generally has no natural productivity in a single well, and can obtain industrial yield by adopting measures such as fracturing, horizontal wells and the like. The compact oil reservoir generally adopts the technology that a horizontal well is matched with multi-section fracturing and the like, a hydraulic fracturing modification area can be effectively formed in a near well area, the formed hydraulic fracturing can effectively communicate with natural fractures in a reservoir layer, and the reserve control range of the horizontal well is further expanded.
At present, research considers that a hydraulic fracturing transformation area formed in a near well area has important contribution to the early-stage yield of an oil well; oil and gas stable production of the oil well depends on seepage of a large matrix area to a shaft. Thus, it is necessary to understand the seepage conditions at various scales in the reservoir (horizontal wellbore, fractured main fracture, fractured secondary fracture, natural fracture and matrix) and the contribution of different zones (matrix zone, natural fracture zone, secondary fracture zone) to the production fluids of the oil well. At present, an experimental method and a device capable of quantitatively researching seepage of a multi-stage fractured horizontal well do not exist, and the device simulates the flowing of fluid in different-scale fractures and reservoirs after the multi-stage fractured horizontal well in the whole process.
The invention aims to provide a compact reservoir horizontal well multi-section fracturing seepage simulation device for quantitatively and modularly researching reservoir seepage conditions after multi-section fracturing of a compact reservoir horizontal well.
Disclosure of Invention
The purpose of the invention is: the device for simulating the multi-stage fracturing seepage of the compact oil reservoir horizontal well is used for quantitatively and modularly researching the seepage condition of the reservoir after the multi-stage fracturing of the compact oil reservoir horizontal well.
In order to achieve the purpose, the invention adopts the following technical scheme: the device comprises an oil storage tank, a valve, an injection pump, a pressure gauge, a simulation box body, a microcomputer, a display, an oil well pump, a flow meter, a liquid storage tank, a horizontal well vertical section, a rock core holder, a fracturing main crack, a horizontal well horizontal section, a flow meter, a pressure gauge, a fracturing secondary crack, an electric control switch, a natural crack, a matrix connecting pipeline, an injection pipeline, a heating piece, a connecting pipeline, a reinforcing hole, a sealing piece and a sealing groove. The method is characterized in that: the oil storage tank, the valve, the injection pump and the pressure gauge are arranged on the same pipeline; the simulation box body is positioned between the pressure gauge and the oil well pump, and the microcomputer and the display are externally connected with the simulation box body; the oil pump, the flow meter, the pressure meter and the liquid storage tank are arranged on a pipeline; the horizontal well vertical section is directly connected with the horizontal section of the horizontal well, the horizontal well vertical section is connected with the oil well pump, and the horizontal section of the horizontal well is connected with a plurality of pressure main cracks; an electric control switch, a flow meter and a pressure meter are arranged on the fracturing main crack and connected with the fracturing secondary crack; the secondary fracture is connected with the main fracture, the core holder, the pressure gauge and the flowmeter after the core holder is connected in series/in parallel; the natural fracture is connected with the core holders in other areas, a pressure gauge and a flowmeter after the core holders are connected in series/in parallel; the matrix connecting pipeline is connected with a pressure gauge, a flowmeter and a core holder in other areas after the serial/parallel core holders; the main fracturing cracks, the secondary fracturing cracks, the natural cracks and the connecting pipelines among the matrixes are all steel pipelines, and the steel pipelines with different diameters are selected according to different flow conductivity of the steel pipelines to the fluid; before simulation, an electric control switch on a fracturing main fracture is closed, an injection pump injects fluid into a simulation box body through an injection pipeline, and after the simulation is finished, the injection pipeline is closed to play a role in keeping the pressure in the rock core holder and all levels of fractures; the heating plates are arranged on two sides of the inner wall of the simulation box body, the horizontal well vertical section, the horizontal well horizontal section, the rock core holder, the flow meter, the pressure gauge, the fracturing main crack, the fracturing secondary crack, the electric control switch, the natural crack and the connecting pipeline between matrixes are all arranged in the simulation box body, the electric control switch adopts a mode that an experimenter externally controls the opening (closing) of the electric control switch, the electric control switch is in a closed state before the simulation starts, and fluid is allowed to enter the horizontal well horizontal section through the fracturing main crack after the electric control switch is opened; the connecting pipeline is connected with the core holder through threads, the reinforcing hole is formed in the body of the core holder, the sealing piece and the sealing groove are respectively formed in the core holder, and the sealing piece is inserted into the sealing groove to play a role in sealing the core holder.
As a further optimization of the scheme, the core holder is a split type columnar holder, wherein the sealing sheet and the sealing groove are used for carrying out internal sealing on the core holder, and the reinforcing hole is matched with the screw to carry out secondary sealing on the core holder; the core holder is communicated with a main fracturing fracture, a secondary fracturing fracture, a natural fracture, an inter-matrix connecting pipeline, a flow meter, a pressure gauge and the like through connecting pipelines.
As further optimization of the scheme, a mode that multi-scale cracks (a main crack, a secondary crack and a natural crack) are communicated with a real core is adopted in the seepage simulation of the multi-stage fractured horizontal well. A rock core of real saturated crude oil is placed in the rock core holder, and the seepage in the rock core can reflect the seepage characteristics of the crude oil in rock in a reservoir most truly; the connection of the multi-scale fracture and the core holder is considered, and the complex communication condition in the reservoir after the horizontal well is subjected to multi-stage fracturing is met.
As further optimization of the scheme, the seepage simulation of the multi-stage fractured horizontal well adopts zones (a secondary fracture zone, a natural fracture zone and a matrix zone) to measure the inflow (outflow) and pressure change conditions of the fluid; monitoring the inflow (outflow) amount of the fluid in each zone by using a flow meter on each pipeline; a pressure gauge is arranged at the boundary of each area and used for measuring the pressure change of the area in each time period; and the pressure and flow data are displayed on a display in real time and the transient pressure and flow data of each node are stored in the microcomputer.
As a further optimization of the scheme, the injection pipeline is connected with the matrix area peripheral core holder and can provide stable external fluid supply (constant pressure boundary) for the horizontal well seepage device after being connected with the pipeline where the injection pump is located; after the injection pipeline is closed, horizontal well seepage flow under the boundary which is obtained by simulating formation pressure wave is not supplemented (the boundary is closed).
As further optimization of the scheme, the plane-symmetric fractured main cracks are adopted in the seepage simulation of the multi-stage fractured horizontal well, and the distance between the fractured main cracks and the length of a single fractured main crack can be changed according to requirements.
As a further optimization of the scheme, the simulation box body is adopted in the horizontal well multistage fracturing seepage simulation to place the rock core holder, the fracturing main crack, the fracturing secondary crack, the matrix connecting pipeline, the flow meter, the pressure gauge, the injection pipeline, the heating sheet and the electric control switch. The simulation box body is internally divided into an upper layer, a middle layer and a lower layer for placing a rock core holder, a fracturing main crack, a fracturing secondary crack, a matrix connecting pipeline and the like, and the simulation box body simulates the planar and vertical three-dimensional flow of crude oil in a thick-layer compact reservoir.
As a further optimization of the scheme, the microcomputer and the display are connected with the pressure gauge and the flow meter in the simulation box body through data transmission lines, pressure and flow data at each point are displayed in real time, and the variation and pressure variation of fluid in each unit can be counted conveniently.
The invention has the following beneficial effects: (1) the influence of the interval of the fracturing main cracks and the length of the fracturing main cracks on the productivity of the multi-stage fractured horizontal well is quantitatively researched, and the device is flexible and adjustable and has strong adaptability according to the basic parameter condition of the model; 2) the pressure and flow data are displayed in real time in a subarea mode, accurate data of fluid flow in each area are determined, and instantaneous fluid flow data in each area are stored; 3) the core holder is internally provided with real core saturated crude oil, the fluid flow is highly consistent with the flow in an underground reservoir, and the reliability is high.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a full-scale seepage simulation diagram of a horizontal well according to the present invention.
FIG. 3 is a simulation diagram of the seepage of a single fracturing main fracture of a horizontal well according to the invention.
FIG. 4 is a full-scale seepage sectional view of a horizontal well in a simulation box body.
Fig. 5 is a front view of a core holder in split view in accordance with the present invention.
Fig. 6 is a side view of a core holder in split form according to the present disclosure.
In the figure: the fracturing fluid comprises an oil storage tank 1, a valve 2, an injection pump 3, a pressure gauge 4, a simulation box body 5, a microcomputer and display 6, an oil well pump 7, a flow meter 8, a fluid storage tank 9, a horizontal well vertical section 10, a core holder 11, a fracturing main crack 12, a horizontal well horizontal section 13, a flow meter 14, a pressure gauge 15, a fracturing secondary crack 16, an electric control switch 17, a natural crack 18, an inter-matrix connecting pipeline 19, an injection pipeline 20, a heating plate 21, a connecting pipeline 22, a reinforcing hole 23, a sealing piece 24 and a sealing groove 25.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the multi-stage fracturing seepage simulation device for the horizontal well of the tight reservoir comprises an oil storage tank 1, a valve 2, an injection pump 3, a pressure gauge 4, a simulation box body 5, a microcomputer and a display 6, an oil well pump 7, a flow meter 8, a liquid storage tank 9, a vertical section 10 of the horizontal well, a core holder 11, a fracturing main fracture 12, a horizontal section 13 of the horizontal well, a flow meter 14, a pressure gauge 15, a fracturing secondary fracture 16, an electric control switch 17, a natural fracture 18, an inter-matrix connecting pipeline 19, an injection pipeline 20, a heating plate 21, a connecting pipeline 22, a reinforcing hole 23, a sealing plate 24 and a sealing groove.
The method is characterized in that: the oil storage tank 1, the valve 2, the injection pump 3 and the pressure gauge 4 are sequentially arranged on a pipeline; the microcomputer and display 6 is externally connected with a simulation box body 5 and is used for displaying and storing pressure and flow data at each node in real time; the oil pump 7, the flow meter 8, the pressure gauge 4 and the liquid storage tank 9 are arranged on a pipeline, the oil pump 7 is used for simulating the exploitation of crude oil of a horizontal well, the flow meter 8 is used for measuring the flow of fluid flowing out of the simulation box body 5, and the liquid storage tank 9 is used for collecting all liquid and gas generated by the device; the horizontal well consists of two parts: the fracturing device comprises a horizontal well vertical section 10 and a horizontal well horizontal section 13, wherein the horizontal well vertical section 10 is connected with an oil well pump 7 through a pipeline, the horizontal well horizontal section 13 is connected with a fracturing main crack 12, and the distance between the fracturing main cracks 12 on the horizontal well horizontal section 13 can be adjusted by changing the position of the fracturing main crack 12 on the horizontal well horizontal section 13; the fracturing main crack 12 is connected with the horizontal section 13 of the horizontal well and a plurality of fracturing secondary cracks 16, and an electric control switch 17, a flow meter 14 and a pressure gauge 15 are sequentially arranged on the fracturing main crack 12 and used for controlling and monitoring the opening (closing) of the fracturing main crack 12 and the pressure and flow data of internal fluid; the secondary fracturing fracture 16 is connected with the fracturing main fracture 12 and the core holder 11, and the area where the fracturing secondary fracturing fracture 16 is distributed is called a secondary fracture area and is the area around the hydraulic fracturing main fracture; one end of the natural fracture 18 is connected with the core holder 11 of the secondary fracture area, the other end of the natural fracture 18 is connected with the core holder 11 of the local area, the area where the natural fracture 18 is distributed is called a natural fracture area, and the natural fracture 18 between the natural fracture area and the secondary fracture area is connected with a flow meter 14 and a pressure meter 15 which are used for monitoring fluid transmission and pressure monitoring from the natural fracture area to the secondary fracture area; one end of the inter-matrix connecting pipeline 19 is connected with the core holder 11 of the area, the other end of the inter-matrix connecting pipeline is connected with the core holder 11 of the natural fracture area, the distribution range of the inter-matrix connecting pipeline 19 is a matrix area (different from the two areas, the area is not influenced by hydraulic fracturing, and the area is also the most widely distributed area in the reservoir), and a flow meter 14 and a pressure meter 15 are arranged on the inter-matrix connecting pipeline 19 and are used for monitoring the fluid conveying condition of the matrix area to the natural fracture area and the fracturing secondary fracture area; the matrix area periphery core holder 11 is communicated with an injection pipeline 20, the injection pipeline 20 closes an electric control switch 17 on a fracturing main fracture 12 before starting simulation, then fluid is injected into the core holder 11 and all levels of fractures, so that the injection pipeline 20 is closed after certain pressure is kept in the device; after the simulation is started, the injection pipeline 20 can be opened, the injection pump 3 can inject fluid into the core holder 11 of the matrix zone through the injection pipeline 20, the condition that the formation pressure reaches the boundary and then stable supplement is obtained (constant pressure boundary) is kept, and the injection pipeline 20 can also be closed, so that the condition that the formation pressure around the horizontal well reaches the boundary and then supplement cannot be obtained (closed boundary) is formed; the main fracturing fracture 12, the secondary fracturing fracture 16, the natural fracture 18 and the inter-matrix connecting pipeline 19 are all steel pipelines, the diameters of the steel pipelines are sequentially reduced, and the differences of the flow conductivity of the fluids in the simulated fractures and the rocks are simulated; the heating plate 21 is arranged in the simulation box body 5 and used for simulating fluid flow under the high-temperature condition of the stratum; the connecting lines 22 serve to connect the core holder 11 to the interbody connecting lines 19, the natural fractures 18 and the fractured secondary fractures 16; the reinforcement holes 23, the sealing pieces 24 and the sealing grooves 25 are all located on the core holder 11, and the connecting lines 22 are installed with the core holder 11 through threads.
The core holder 11 is a split type columnar holder, wherein the inside of the holder is sealed by a sealing sheet 24 and a sealing groove 25, and a reinforcing hole 23 is matched with a screw to perform secondary sealing on the core holder 11; the core holder 11 communicates with the core holder 11 and the primary fracture 12, the secondary fracture 16, the natural fracture 18 and the interbody connecting lines 19 via connecting lines 22.
A mode that multi-scale fractures (a fracturing main fracture 12, a fracturing secondary fracture 16 and a natural fracture 18) are communicated with a rock core holder 11 (a real rock core) is adopted in the seepage simulation after the horizontal well is fractured. A rock core of real saturated crude oil is placed in the rock core holder 11, and the seepage in the rock core can reflect the seepage characteristics of the crude oil in a reservoir layer most truly; the connection of the multi-scale fracture and the core holder 11 is considered, and the complex communication relation in the reservoir after the horizontal well is fractured at multiple stages is met.
In the seepage simulation after the fracturing of the horizontal well, the subareas (a secondary fracture area, a natural fracture area and a matrix area) are used for measuring the inflow (outflow) of fluid and the pressure change. The amount of fluid inflow (outflow) for each zone is monitored with the flow meter 14 on the respective pipeline; at the boundary of each zone, a pressure gauge 15 is installed for measuring the pressure change of the zone for each period of time.
The injection pipeline 20 is connected with the matrix zone peripheral core holder 11 and can provide stable external fluid supply (constant pressure boundary) for the multi-stage fractured horizontal well seepage device after being connected with a pipeline where the injection pump 3 is located; after the injection line 20 is closed, the simulated pressure sweep reaches horizontal well seepage at the boundary without being supplemented (closed boundary).
The plane symmetric fracturing main cracks 12 are adopted in the seepage simulation of the multi-stage fracturing horizontal well, and the distance between the fracturing main cracks 12 and the length of a single fracturing main crack 12 can be changed according to requirements.
In the multi-stage fractured horizontal well seepage simulation, a simulation box body 5 is used for placing a core holder 11, a fractured main fracture 12, a fractured secondary fracture 16, a matrix connecting pipeline 19 and the like. The simulation box body 5 is internally divided into an upper layer, a middle layer and a lower layer for placing a rock core holder 11, and the simulation box body simulates the planar and vertical three-dimensional flow of crude oil in a thick-layer compact reservoir.
The microcomputer and the display 6 are connected with a pressure gauge 14 and a flow meter 15 in the simulation box body 5 through data transmission lines; the pressure and flow data can be displayed on the microcomputer and display 6 in real time, and the transient pressure and flow data of each node are stored in the microcomputer and display 6, so that the quantitative statistics of fluid changes and pressure changes in each region is facilitated.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and that various changes, modifications, additions and substitutions which are within the spirit and scope of the present invention may be made by those skilled in the art.
Claims (7)
1. The tight oil reservoir horizontal well multi-section fracturing seepage simulation device comprises an oil storage tank (1), a valve (2), an injection pump (3), a pressure gauge (4), a simulation box body (5), a microcomputer and a display (6), an oil well pump (7), a flow meter (8), a liquid storage tank (9), a horizontal well vertical section (10), a rock core holder (11), a fracturing main crack (12), a horizontal well horizontal section (13), a flow meter (14), a pressure gauge (15), a fracturing secondary crack (16), an electric control switch (17), a natural crack (18), a matrix connecting pipeline (19), an injection pipeline (20), a heating sheet (21), a connecting pipeline (22), a reinforcing hole (23), a sealing sheet (24) and a sealing groove (25); the method is characterized in that: the oil storage tank (1), the valve (2), the injection pump (3) and the pressure gauge (4) form an injection module of the device; the oil pump (7), the microcomputer and the display (6), the flow meter (8), the pressure gauge (4) and the liquid storage tank (9) form a production module of the equipment; a horizontal well vertical section (10), a horizontal well horizontal section (13), a fracturing main crack (12), a fracturing secondary crack (16), a natural crack (18), an inter-matrix connecting pipeline (19), a rock core holder (11), a flow meter (14), a pressure gauge (15), an electric control switch (17), an injection pipeline (20) and a heating plate (21) are arranged in the simulation box body (5); the horizontal well vertical section (10) is connected with the oil well pump (7) through a pipeline, and the horizontal well horizontal section (13) is connected with the fracturing main crack (12); the fracturing main crack (12) is connected with the horizontal section (13) of the horizontal well and a plurality of fracturing secondary cracks (16), and an electric control switch (17), a flow meter (14) and a pressure meter (15) are sequentially arranged on the fracturing main crack (12) and used for controlling and monitoring the opening (closing) of the fracturing main crack (12) and the flow of internal fluid; the secondary fracturing fracture (16) is connected with the fracturing main fracture (12) and the core holder (11); the natural fracture (18) is connected with the core holder (11) of the secondary fracturing zone and the core holder (11) of the zone, and a flow meter (14) and a pressure meter (15) are connected between the natural fracture (18) and the secondary fracturing fracture (16) for monitoring fluid transmission and pressure change from the natural fracture zone to the secondary fracture zone; one end of a connecting pipeline (19) between matrixes is connected with the core holder (11), the other end of the connecting pipeline is connected with the core holder (11) of the natural fracture zone, a flow meter (14) and a pressure meter (15) are arranged on the connecting pipeline (19) between matrixes and used for monitoring the fluid conveying condition from the matrix zone to the natural fracture zone, and the peripheral core holder (11) is communicated with an injection pipeline (20); the heating plate (21) is arranged in the simulation box body (5) and is used for simulating the fluid flow under the high-temperature condition of the stratum; the connecting pipeline (22) is used for connecting the connecting pipeline (19) between the core holder (11) and the matrix, the natural fracture (18) and the secondary fracturing fracture (16); the reinforcing hole (23), the sealing piece (24) and the sealing groove (25) are all located on the core holder (11), and the sealing piece (24) is inserted into the sealing groove (25) to play a role in sealing the core holder.
2. The tight reservoir horizontal well multi-stage fracturing seepage simulation device of claim 1, wherein: the core holder (11) is a split type columnar holder, wherein a sealing sheet (24) is inserted into a sealing groove (25) to seal the interior of the core holder (11), and a reinforcing hole (23) is matched with a screw to perform secondary sealing on the core holder (11); the core holder (11) is communicated with a fracturing main fracture (12), a fracturing secondary fracture (16), a natural fracture (18) and an inter-matrix connecting pipeline (19) through a connecting pipeline (22).
3. The tight reservoir horizontal well multi-stage fracturing seepage simulation device of claim 1, wherein: in the multi-section fractured horizontal well seepage simulation, a mode that multi-scale fractures (a main fractured fracture (12), secondary fractured fractures (16) and natural fractures (18)) are communicated with a core holder (11) (containing a real core) is adopted; a core of real saturated crude oil is placed in the core holder (11), and seepage in the core can reflect the crude oil flow in the rock in the reservoir most truly; and (3) considering that the multi-scale fracture is connected with the core holder (11), representing the complex communication relation in the multi-stage fractured horizontal well reservoir.
4. The tight reservoir horizontal well multi-stage fracturing seepage simulation device of claim 1, wherein: in the seepage simulation of the multi-section fractured horizontal well, the subareas (a secondary fracture area, a natural fracture area and a matrix area) are adopted to measure the inflow (outflow) of fluid and the pressure change; the inflow (outflow) of the fluid in each zone is measured by a flow meter (14) on each pipeline, and a pressure gauge (15) is arranged at the boundary of each zone and used for measuring the pressure change of the point in each time period to obtain instantaneous fluid flow data of different zones.
5. The tight reservoir horizontal well multi-stage fracturing seepage simulation device of claim 1, wherein: one end of an injection pipeline (20) is connected with the matrix zone peripheral core holder (11), and the other end of the injection pipeline is connected with a pipeline where the injection pump (3) is located, so that stable external fluid supply (constant pressure boundary) can be provided for the multi-stage fractured horizontal well seepage device; after the injection pipeline (20) is closed, the simulated formation pressure wave reaches the horizontal well seepage flow under the boundary which cannot be supplemented (the boundary is closed).
6. The tight reservoir horizontal well multi-stage fracturing seepage simulation device of claim 1, wherein: the plane symmetric fracturing main crack (12) is adopted in the seepage simulation of the multi-section fractured horizontal well, and the position of the fracturing main crack (12) on the horizontal section (13) of the horizontal well and the length of a single fracturing main crack (12) can be changed according to requirements.
7. The tight reservoir horizontal well multi-stage fracturing seepage simulation device of claim 1, wherein: in the seepage simulation of the multi-section fractured horizontal well, a simulation box body (5) is adopted to place a rock core holder (11), a fractured main fracture (12), a fractured secondary fracture (16), a matrix connecting pipeline (19) and the like; the simulation box body (5) is internally divided into an upper layer, a middle layer and a lower layer for placing a rock core holder (11) and simulating the plane flow and vertical three-dimensional flow of crude oil in the thick-layer compact reservoir.
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| CN113982552A (en) * | 2021-10-22 | 2022-01-28 | 中国石油大学(北京) | Experimental device and method for representing energy increase from crack to matrix depth |
| CN114464067A (en) * | 2022-03-08 | 2022-05-10 | 西南石油大学 | Multi-scale net-sewing experimental device and experimental method thereof |
| CN114482969A (en) * | 2022-04-14 | 2022-05-13 | 西南石油大学 | Experimental device for simulating stewing fracturing fluid flowback of multistage fracturing in unequal time |
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| CN114464067A (en) * | 2022-03-08 | 2022-05-10 | 西南石油大学 | Multi-scale net-sewing experimental device and experimental method thereof |
| CN114482969A (en) * | 2022-04-14 | 2022-05-13 | 西南石油大学 | Experimental device for simulating stewing fracturing fluid flowback of multistage fracturing in unequal time |
| CN114482969B (en) * | 2022-04-14 | 2022-08-19 | 西南石油大学 | Experimental device for simulating stewing fracturing fluid flowback of multistage fracturing in unequal time |
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