CN110410052B - Device and method for simulating shale gas reservoir fracture drainage gas recovery efficiency - Google Patents
Device and method for simulating shale gas reservoir fracture drainage gas recovery efficiency Download PDFInfo
- Publication number
- CN110410052B CN110410052B CN201910662253.8A CN201910662253A CN110410052B CN 110410052 B CN110410052 B CN 110410052B CN 201910662253 A CN201910662253 A CN 201910662253A CN 110410052 B CN110410052 B CN 110410052B
- Authority
- CN
- China
- Prior art keywords
- gas
- switch
- channel
- crack
- control valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000011084 recovery Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 134
- 239000011435 rock Substances 0.000 claims abstract description 103
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 238000004519 manufacturing process Methods 0.000 claims abstract description 36
- 238000003860 storage Methods 0.000 claims abstract description 31
- 238000009826 distribution Methods 0.000 claims abstract description 15
- 238000005086 pumping Methods 0.000 claims description 36
- 239000011521 glass Substances 0.000 claims description 11
- 230000000007 visual effect Effects 0.000 claims description 11
- 239000003550 marker Substances 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 6
- 238000002474 experimental method Methods 0.000 abstract description 5
- 238000004088 simulation Methods 0.000 abstract description 2
- 238000004043 dyeing Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/002—Survey of boreholes or wells by visual inspection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a device and a method for simulating shale gas reservoir crack water drainage gas recovery efficiency, wherein the device comprises a liquid storage tank, a liquid pump, a gas storage tank, a gas pump, a rock plate clamp holder and a recovery tank; the recovery tank is communicated with the outlet end of the rock plate holder through a pipeline, the inlet end of the rock plate holder is respectively communicated with the outlet ends of the liquid pump and the gas pump through pipelines, and the liquid storage tank and the gas storage tank are respectively communicated with the inlet ends of the liquid pump and the gas pump through pipelines; the rock plate holder is provided with a rock plate, and a confluence channel and a shunting channel are formed between the upper end surface and the lower end surface of the rock plate and the upper inner wall and the lower inner wall of the rock plate holder. The method carries out experimental simulation on the drainage and gas production efficiency in the fractured fracture of the shale horizontal well, and visually observes the distribution rule of the fracturing fluid in the fracture, lays a foundation for subsequently taking acidizing fracturing yield-increasing measures, improving the fracturing efficiency of the shale gas reservoir, and fills up the blank of verifying the flowback efficiency of the shale gas reservoir in experiments.
Description
Technical Field
The invention relates to equipment and a method for simulating shale gas reservoir fracture drainage gas recovery efficiency, and belongs to the technical field of shale gas reservoir fracturing horizontal well exploitation.
Background
At present, the yield of the conventional oil and gas reservoir in China cannot meet the requirements of consumers to a certain extent, so that petroleum workers focus on the unconventional oil and gas reservoir, such as dense gas, dense oil, shale gas and combustible ice. Among the unconventional oil and gas resources, the development of shale gas is particularly rapid, and a horizontal well has the advantages of large contact area with an oil reservoir and long gas leakage channel, so that the horizontal well is widely applied to the exploitation process of the shale gas. Meanwhile, the shale gas reservoir has extremely low permeability and is not easy to develop, and in order to fully utilize natural cracks of a shale layer, free gas contained in the shale gas reservoir and adsorbed gas on the surface of organic mineral are exploited, so that the exploitation efficiency of the shale gas is improved, and almost all horizontal wells adopt a fracturing technology.
After fracturing is completed, the drainage and gas production efficiency of the fracture needs to be evaluated, but in the prior art, the research on the shale gas pressure back flowback efficiency is mainly based on theory, and the research on the shale gas pressure back flowback efficiency through experiments is less. Therefore, the device and the method for simulating the drainage and gas production efficiency of the shale gas reservoir fracture are designed by combining the current visualization technology, and are used for evaluating the drainage and gas production efficiency of the fracturing fluid and visually observing the distribution rule of the fracturing fluid in the fracture after the shale reservoir fracture is simulated, so that a foundation is laid for subsequent yield increasing measures and a fracturing process, and the fracturing effect is further improved.
Disclosure of Invention
The invention mainly overcomes the defects in the prior art, provides the equipment and the method for simulating the drainage gas recovery efficiency of the shale gas reservoir fracture, can realize the evaluation of the drainage gas recovery efficiency in the fracture, and provides guidance for subsequent yield increase measures.
The technical scheme provided by the invention for solving the technical problems is as follows: a device for simulating shale gas reservoir crack water drainage gas recovery efficiency comprises a liquid storage tank, a liquid pump, a gas storage tank, a gas pump, a rock plate holder and a recovery tank;
the recovery tank is communicated with the outlet end of the rock plate holder through a pipeline, the inlet end of the rock plate holder is respectively communicated with the outlet ends of the liquid pump and the gas pump through pipelines, and the liquid storage tank and the gas storage tank are respectively communicated with the inlet ends of the liquid pump and the gas pump through pipelines;
the rock plate holder is provided with a rock plate, the rock plate is a cuboid with shale gas reservoir properties, and a first crack, a second crack and a third crack are sequentially arranged from right to left; and a confluence channel and a diversion channel are formed between the upper end surface and the lower end surface of the rock plate and the upper inner wall and the lower inner wall of the rock plate holder, and the two ends of the first crack, the second crack and the third crack are respectively communicated with the confluence channel and the diversion channel.
The further technical scheme is that the outlet ends of the liquid pump and the gas pump are respectively provided with a liquid control valve and a gas control valve.
The further technical scheme is that an inlet flowmeter and an outlet flowmeter are respectively arranged at the inlet end and the outlet end of the rock plate holder.
The further technical scheme is that the first crack comprises a main trunk I and first-level branches I which are respectively communicated with the main trunk I;
the length and the shape of the first cracks and the second cracks are completely the same;
the third crack comprises a main stem II, three primary branches II and nine secondary branches II, and the main stem II is respectively communicated with the three primary branches II; the first-stage branch II is respectively communicated with the three second-stage branches II;
the first-stage branch I and the second-stage branch II are respectively connected with a flow dividing channel, and the trunk I and the trunk II are respectively communicated with a flow converging channel.
The further technical scheme is that a first shunt channel switch, a second shunt channel switch and a third shunt channel switch are arranged in the shunt channel; the diversion channel first switch, the diversion channel second switch and the diversion channel third switch are respectively positioned between the first crack and the inlet end of the rock plate holder, between the first crack and the second crack, between the second crack and the third crack;
a first switch of a confluence channel, a second switch of the confluence channel and a third switch of the confluence channel are arranged in the confluence channel; the first switch, the second switch and the third switch of the confluence channel are respectively positioned at the intersection of the first crack, the second crack, the third crack and the confluence channel.
A method for simulating shale gas reservoir fracture drainage gas recovery efficiency comprises the following steps:
the first step is as follows: manufacturing a rock plate, and pressing the rock plate with shale property, wherein the length, the width and the height of the rock plate are respectively 20 cm, 15 cm and 2 cm;
the second step is that: the method comprises the following steps of (1) describing cracks, namely describing three cracks on a rock plate, namely a first crack, a second crack and a third crack;
the third step: the connecting equipment is used for connecting the liquid storage tank, the liquid pump, the liquid control valve, the inlet flowmeter, the gas storage tank, the gas pump, the gas control valve, the rock core holder, the outlet flowmeter and the recovery tank, putting the rock plate obtained in the second step into the rock plate holder, and screwing the visual glass cover on the rock plate holder;
the fourth step: measuring the volume V of the first fractureaOpening a first switch of a diversion channel and a first switch of a confluence channel, opening a liquid control valve, starting a liquid pump, pumping the water containing the color marker in the liquid storage tank into the rock plate holder until the first crack is completely immersed by water, and respectively recording the volume V of the water entering and flowing out of the rock plate holder1、V2Simultaneously calculating the total volume V of the pipeline and the water flowing through the diversion channel and the confluence channel3Obtaining a volume of the first fracture Va＝V1-V2-V3After the recording is finished, closing the liquid control valve and the liquid pump, and closing all switches;
the fifth step: measuring the volume V of the second fracturebOpening a first switch of a diversion channel, a second switch of the diversion channel and a second switch of a confluence channel, opening a liquid control valve, starting a liquid pump, pumping the water containing the color marker in the liquid storage tank into the rock plate holder until a second crack is completely immersed by the water, and respectively recording the volume V of the water entering and flowing out of the rock plate holder4、V5And simultaneously calculating the total volume V of water flowing through the diversion channel and the confluence channel6Obtaining a second fracture volume Vb＝V4-V5-V6After the recording is finished, closing the liquid control valve and the liquid pump, and closing all switches;
and a sixth step: measuring volume V of third fracturecOpening a first switch of a diversion channel, a second switch of the diversion channel, a third switch of the diversion channel and a third switch of a confluence channel, opening a liquid control valve, starting a liquid pump, pumping the water containing the color marker into the rock plate holder until a third crack is completely immersed by the water, and respectively recording the water entering and flowing out of the rock plate holderProduct V7、V8And simultaneously calculating the total volume V of the liquid flowing through the flow dividing channel and the flow converging channel9Obtaining a third fracture volume Vc＝V7-V8-V9After the recording is finished, closing the liquid control valve and the liquid pump, and closing all switches;
the seventh step: measuring first crack drainage gas production efficiency K1Opening a first switch of a diversion channel and a first switch of a confluence channel, pumping gas, opening a gas control valve, starting a gas pump, pumping the gas into the rock plate holder, and recording the volume V of the displaced water10Observing the distribution rule of the residual water in the first crack through the visual glass cover, closing the gas control valve and the gas pump after recording, closing all switches, and calculating the drainage and gas production efficiency of the first crack
Eighth step: measuring second crack drainage gas production efficiency K2Opening the first switch of the diversion channel, the second switch b and the second switch of the confluence channel, pumping gas, opening the gas control valve, starting the gas pump, pumping the gas into the rock plate holder, and recording the volume V of the displaced water11Observing the distribution rule of the residual water in the second crack through the visual glass cover, closing the gas control valve and the gas pump after recording, closing all switches, and calculating the drainage and gas production efficiency of the second crack
The ninth step: measuring the third crack drainage gas production efficiency K3Opening a first switch of a diversion channel, a second switch of the diversion channel, a third switch of the diversion channel and a third switch of a confluence channel, pumping gas, opening a pneumatic control valve, starting a gas pump, pumping the gas into a rock plate holder, and recording the volume V of the displaced water12Observing the distribution rule of the residual water in the third crack, closing the gas control valve and the gas pump after recording, closing all switches, and calculating the drainage and gas recovery efficiency of the third crack
The tenth step: measuring drainage gas recovery efficiency K when displacing a first fracture and a second fracture simultaneously4Opening the first switch and the second switch of the diversion channel, opening the first switch and the second switch of the confluence channel, opening the liquid control valve and the liquid pump, pumping water to fill the first crack and the second crack, closing the liquid control valve and the liquid pump, opening the gas control valve and the gas pump, and recording the volume V of the discharged water15Simultaneously calculating the total volume V of the gas flowing through the flow dividing channel and the flow converging channel in the pipeline and the rock plate holder16Calculating the water drainage and gas production efficiency
The eleventh step: measuring drainage gas production efficiency K5 when displacing a first crack and a third crack simultaneously, opening a first switch of a diversion channel, a second switch of the diversion channel, a third switch of the diversion channel, a first switch of a confluence channel and a third switch of the confluence channel, opening a liquid control valve and a liquid pump, filling the first crack and the third crack with pumped water, closing the liquid control valve and the liquid pump, opening the gas control valve and a gas pump, and recording volume V of discharged water17Simultaneously calculating the total volume V of the gas passing through the diversion channel and the confluence channel in the pipeline and the rock plate holder18Calculating the water drainage and gas production efficiency
The twelfth step: measuring drainage gas recovery efficiency K of simultaneously displacing second crack and third crack6Opening a first switch of a diversion channel, a second switch of the diversion channel, a third switch of the diversion channel, a second switch of a confluence channel and a third switch, opening a liquid control valve and a liquid pump, pumping water to fill the second crack and the third crack, closing the liquid control valve and the liquid pump, opening a gas control valve and a gas pump, and recording the volume V of the discharged water19Simultaneously calculating the total volume V of the gas passing through the diversion channel and the confluence channel in the pipeline and the rock plate holder20CalculatingDrainage gas recovery efficiency
The thirteenth step: measuring drainage gas recovery efficiency K when simultaneously displacing a first fracture, a second fracture and a third fracture7Opening all switches, opening the liquid control valve and the liquid pump, pumping water to fill the three cracks, closing the liquid control valve and the liquid pump, opening the gas control valve and the gas pump, and recording the volume V of the discharged water21Simultaneously calculating the total volume V of the gas in the pipeline and the rock plate holder passing through the diversion channel and the confluence channel22Calculating the water drainage and gas production efficiency
The fourteenth step is that: and comparing the drainage gas production efficiency, and analyzing the influence rule of the crack form and the crack number on the drainage gas production efficiency.
Compared with the prior art, the invention has the beneficial effects that: the method carries out experimental simulation on the drainage and gas production efficiency in the fractured fracture of the shale horizontal well, and visually observes the distribution rule of the fracturing fluid in the fracture, lays a foundation for subsequently taking acidizing fracturing yield-increasing measures, improving the fracturing efficiency of the shale gas reservoir, and fills up the blank of verifying the flowback efficiency of the shale gas reservoir in experiments.
Drawings
FIG. 1 is a schematic connection diagram of a main body part of an apparatus for simulating shale gas reservoir fracture drainage gas recovery efficiency;
figure 2 is a horizontal cross-section of the rock plate holder of the invention.
Reference numerals: 1-a liquid storage tank; 2-a liquid pump; 3-a liquid control valve; 4-inlet flow meter; 5-a gas storage tank; 6-a gas pump; 7-a gas control valve; 8-a rock plate holder; 9-outlet flow meter; 10-a recovery tank; 801-rock plate; 802-a flow-splitting channel; 802 a-a shunt channel first switch; 802 b-a shunt channel second switch; 802 c-shunt channel third switch; 803-a sink channel; 803 a-bus channel first switch; 803 b-bus channel second switch; 803 c-third switch of the sink channel; 804 — a first fracture; 805-a second fracture; 806-third crack.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
As shown in fig. 1, the device for simulating shale gas reservoir fracture drainage gas recovery efficiency comprises a liquid storage tank 1, a liquid pump 2, a liquid control valve 3, an inlet flowmeter 4, a gas storage tank 5, a gas pump 6, a gas control valve 7, a rock plate holder 8, an outlet flowmeter 9 and a recovery tank 10;
the pipelines sequentially communicated with the liquid storage tank 1, the liquid pump 2 and the liquid control valve 3 are converged with the pipelines sequentially communicated with the gas storage tank 5, the gas pump 6 and the gas control valve 7, and are jointly connected with the inlet flowmeter 4, and the inlet flowmeter 4 is communicated with the inlet end of the rock plate clamp holder 8; the outlet end of the rock plate holder 8 is communicated with an outlet flowmeter 9 and a recovery tank 10 in sequence.
Figure 2 is a horizontal cross-section of the rock plate holder of the invention. The rock plate 801 is placed in the rock plate holder 8, the rock plate 801 is a cuboid with shale gas reservoir properties, three cracks are carved on the rock plate 801, the lengths and the forms of a first crack 804 and a second crack 805 are completely the same, and the forms of the first crack 804 and the second crack 805 are a main body I and four primary branches I; the third crack 806 has a length, size and shape different from the two cracks, and has a shape of a main trunk II, three primary branches II and nine secondary branches II, wherein each primary branch II comprises three secondary branches II;
a diversion channel 802 and a confluence channel 803 are formed between the upper end surface and the lower end surface of the rock plate 801 and the upper inner wall and the lower inner wall of the rock plate holder 8, wherein the confluence channel 803 is used for simulating the flow of a horizontal well; the four first-stage branches i and the nine second-stage branches ii are connected to the flow dividing channel 802, and the trunk i and the trunk ii are connected to the flow converging channel 803.
A first shunt channel switch 802a, a second shunt channel switch 802b, and a third shunt channel switch 802c are disposed in the shunt channel 802, and a first bus channel switch 803a, a second bus channel switch 803b, and a third bus channel switch 803c are disposed in the bus channel 803.
The diversion channel first switch 802a is arranged on the diversion channel 802 between the first slit 804 and the inlet end of the rock plate holder 8, the diversion channel second switch 802b is arranged on the diversion channel 802 between the first slit 804 and the second slit 805, and the diversion channel third switch 802c is arranged on the diversion channel between the second slit 805 and the third slit 806; the first switch 803a of the confluence channel is arranged at the junction of the first crack 804 and the convergence channel 803, the second switch 803b of the confluence channel is arranged at the junction of the second crack 805 and the convergence channel 803, and the third switch 803c of the confluence channel is arranged at the junction of the third crack 806 and the convergence channel 803.
The liquid storage tank 1 is filled with dyeing water, the rock plate clamp 8 is a visual glass clamp, namely, the distribution rule of the dyeing water in the first crack 804, the second crack 805 and the third crack 806 when the dyeing water flows through the rock plate 801 is observed through a visual glass cover of the rock plate clamp 8.
The experimental procedure of the above equipment was:
the first step is as follows: manufacturing a rock plate 801, and pressing the rock plate 801 with shale properties, wherein the length, the width and the height of the rock plate 801 are respectively 20 cm, 15 cm and 2 cm;
the second step is that: a, drawing cracks, namely drawing three cracks on a rock plate 801, namely a first crack 804, a second crack 805 and a third crack 806;
the third step: the connecting equipment is used for connecting the liquid storage tank 1, the liquid pump 2, the liquid control valve 3, the inlet flow meter 4, the gas storage tank 5, the gas pump 6, the gas control valve 7, the rock core holder 8, the outlet flow meter 9 and the recovery tank 10, putting the rock plate 801 obtained in the second step into the rock plate holder 8, and screwing the visual glass cover on the rock plate holder 8;
the fourth step: measuring the volume V of the first fracture 804aOpening a first switch 802a of a diversion channel and a first switch 803a of a confluence channel, opening a liquid control valve 3, starting a liquid pump 2, pumping water containing color markers in a liquid storage tank 1 into a rock plate holder 8 until a first crack 804 is completely immersed by water, and respectively recording the volume V of the water entering and flowing out of the rock plate holder 81、V2And simultaneously calculating the total volume V of the pipeline and water flowing through the diversion channel 802 and the confluence channel 8033To obtain a volume V of the first fracture 804a＝V1-V2-V3After the recording is finished, closing the liquid control valve 3 and the liquid pump 2, and closing all switches;
the fifth step: measuring the volume V of the second fracture 805bOpening a first switch 802a of a diversion channel, a second switch 802b of the diversion channel and a second switch 803b of a confluence channel, opening a liquid control valve 3, starting a liquid pump 2, pumping the water containing the color marker in the liquid storage tank 1 into the rock plate holder 8 until the second crack 805 is completely immersed by the water, and respectively recording the volume V of the water entering and flowing out of the rock plate holder 84、V5And simultaneously calculating the total volume V of water flowing through the diversion channel 802 and the confluence channel 8036Obtaining a second fracture volume Vb＝V4-V5-V6After the recording is finished, closing the liquid control valve 3 and the liquid pump 2, and closing all switches;
and a sixth step: measuring the volume V of the third fracture 806cOpening a first switch 802a, a second switch 802b, a third switch 802c of a diversion channel and a third switch 803c of a confluence channel, opening a liquid control valve 3, starting a liquid pump 2, pumping water containing a color marker into the rock plate holder 8 until a third crack 806 is completely immersed by water, and respectively recording the volume V of the water entering and flowing out of the rock plate holder 87、V8And simultaneously calculating the total volume V of the liquid flowing through the flow dividing channel 802 and the flow converging channel 8039To obtain a volume V for the third crack 806c＝V7-V8-V9After the recording is finished, closing the liquid control valve 3 and the liquid pump 2, and closing all switches;
the seventh step: measuring the first fracture 804 drainage gas recovery efficiency K1Opening the first switch 802a of the diversion channel and the first switch 803a of the confluence channel, pumping gas, opening the pneumatic control valve 7, starting the gas pump 6, pumping gas into the rock plate holder 8, and recording the volume V of the displaced water10Observing the distribution rule of the residual water in the first crack 804 through the visual glass cover, and closing the gas control valve after recordingThe door 7 and the gas pump 6 are closed, all the switches are closed, and the drainage and gas production efficiency of the first crack 804 is calculated
Eighth step: measuring the second crack 805 drainage gas recovery efficiency K2Opening a first switch 802a and a second switch 802b of a diversion channel and a second switch 803b of a confluence channel, pumping gas, opening a pneumatic control valve 7, starting a gas pump 6, pumping the gas into a rock plate holder 8, and recording the volume V of the displaced water11Observing the distribution rule of the residual water in the second crack 805 through a visual glass cover, closing the gas control valve 7 and the gas pump 6 after recording, closing all switches, and calculating the water drainage and gas production efficiency of the second crack 805
The ninth step: measuring the drainage gas recovery efficiency K of the third crack 8063Opening a first switch 802a of a diversion channel, a second switch 802b of the diversion channel, a third switch 802c of the diversion channel and a third switch 803c of a confluence channel, pumping gas, opening a pneumatic control valve 7, starting a gas pump 6, pumping the gas into a rock plate holder 8, and recording the volume V of the displaced water12Observing the distribution rule of the residual water in the third crack 806, closing the gas control valve 7 and the gas pump 6 after recording, closing all the switches, and calculating the drainage and gas recovery efficiency of the third crack
The tenth step: measuring drainage gas recovery efficiency K when simultaneously displacing first fracture 804 and second fracture 8054Opening a first switch 802a and a second switch 802b of a diversion channel, opening a first switch 803a and a second switch 803b of a confluence channel, opening a liquid control valve 3 and a liquid pump 2, pumping water to fill a first crack 804 and a second crack 805, closing the liquid control valve 3 and the liquid pump 2, opening a gas control valve 7 and a gas pump 6, and recording the volume V of discharged water15Simultaneous calculation of gas flow diversion passages in the pipeline and the rock plate holder 8802. Total volume V of the collecting channel 80316Calculating the water drainage and gas production efficiency
The eleventh step: measuring drainage gas recovery efficiency K when simultaneously displacing first fracture 804 and third fracture 8055Opening a first switch 802a of a diversion channel, a second switch 802b of the diversion channel, a third switch 802c of the diversion channel, a first switch 803a of a confluence channel and a third switch 803c of the confluence channel, opening a liquid control valve 3 and a liquid pump 2, pumping water to fill the first crack 804 and the third crack 805, closing the liquid control valve 3 and the liquid pump 2, opening a gas control valve 7 and a gas pump 6, and recording the volume V of discharged water17Simultaneously calculating the total volume V of the gas in the pipeline and the rock plate holder 8 passing through the diversion channel 802 and the confluence channel 80318Calculating the water drainage and gas production efficiency
The twelfth step: measuring drainage gas recovery efficiency K while simultaneously displacing second and third fractures 805, 8066Opening a first switch 802a of a diversion channel, a second switch 802b of the diversion channel, a third switch 802c of the diversion channel, a second switch 803b of a confluence channel and a third switch 803c of the confluence channel, opening a liquid control valve 3 and a liquid pump 2, filling the second crack 805 and the third crack 806 with pumped water, closing the liquid control valve 3 and the liquid pump 2, opening a gas control valve 7 and a gas pump 6, and recording the volume V of discharged water19Simultaneously calculating the total volume V of the gas in the pipeline and the rock plate holder 8 passing through the diversion channel 802 and the confluence channel 80320Calculating the water drainage and gas production efficiency
The thirteenth step: measuring drainage gas recovery efficiency K when simultaneously displacing first fracture 804, second fracture 805, third fracture 8067Opening all switches, opening the liquid control valve 3 and the liquid pump 2, pumping water to fill the three cracks, closing the liquid control valve 3 and the liquid pump 2, opening the gas control valve 7 and the gas pump 6,recording volume V of water discharged21Simultaneously calculating the total volume V of the gas in the pipeline and the rock plate holder 8 through the diversion channel 802, the confluence channel 80322Calculating the water drainage and gas production efficiency
The fourteenth step is that: and comparing the drainage gas production efficiency, and analyzing the influence rule of the crack form and the crack quantity on the drainage gas production efficiency.
In the technical scheme provided by the embodiment of the invention, the flow path of the fluid in the pipeline is that dyeing marking water in a liquid storage tank 1 firstly enters a diversion channel 802 of a rock plate clamp 8 through a liquid pump 2, a liquid control valve 3 and an inlet flowmeter 4, then simultaneously flows into a confluence channel 803 through a first crack 804, a second crack 805 and a third crack 806, and finally flows into a recovery tank 10 through an outlet flowmeter 9; the gas in the gas storage tank 5 firstly enters the rock plate holder 8 through the gas pump 6, the liquid control valve 7 and the inlet flow meter 4 to displace water in the diversion channel 802, the first crack 804, the second crack 805, the third crack 806 and the confluence channel 803, and finally flows into the recovery tank 10 through the outlet flow meter 9. The fracture form, the influence of the number of the fractures on the drainage and gas recovery efficiency of the shale gas reservoir and the distribution rule of liquid can be obtained by operating according to the fourteen-step standardized flow of the equipment using steps in the embodiment.
At present, the back flow-back efficiency of the shale gas reservoir is focused on theoretical research, the distribution rule of the fracturing fluid is intuitively explored through experiments, and the flow-back efficiency is measured less.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (1)
1. A method for simulating shale gas reservoir fracture drainage gas recovery efficiency is characterized by comprising the following steps:
the first step is as follows: manufacturing a rock plate (801), and pressing the rock plate (801) with shale properties, wherein the length, the width and the height of the rock plate are respectively 20 cm, 15 cm and 2 cm;
the second step is that: the method comprises the steps of (1) drawing a crack, wherein three cracks are drawn on a rock plate (801), namely a first crack (804), a second crack (805) and a third crack (806);
the third step: the connecting equipment is used for connecting the liquid storage tank (1), the liquid pump (2), the liquid control valve (3), the inlet flowmeter (4), the gas storage tank (5), the gas pump (6), the gas control valve (7), the rock plate holder (8), the outlet flowmeter (9) and the recovery tank (10), placing the rock plate (801) obtained in the second step into the rock plate holder (8), and screwing the visual glass cover on the rock plate holder (8);
the recovery tank (10) is communicated with the outlet end of the rock plate holder (8) through a pipeline, the inlet end of the rock plate holder (8) is respectively communicated with the outlet ends of the liquid pump (2) and the gas pump (6) through pipelines, the liquid storage tank (1) and the gas storage tank (5) are respectively communicated with the inlet ends of the liquid pump (2) and the gas pump (6) through pipelines, and the liquid control valve (3) and the gas control valve (7) are respectively positioned at the outlet ends of the liquid pump (2) and the gas pump (6); the first crack (804) comprises a main trunk I and first-stage branches I which are respectively communicated with the main trunk I;
the first crack (804) and the second crack (805) have the same length and shape;
the third crack (806) comprises a main stem II, three primary branches II and nine secondary branches II, and the main stem II is respectively communicated with the three primary branches II; the first-stage branch II is respectively communicated with the three second-stage branches II;
the first-stage branch I and the second-stage branch II are respectively connected with a flow dividing channel (802), and the trunk I and the trunk II are respectively communicated with a flow converging channel (803);
an inlet flowmeter (4) and an outlet flowmeter (9) are respectively arranged at the inlet end and the outlet end of the rock plate holder (8);
a first shunt channel switch (802a), a second shunt channel switch (802b) and a third shunt channel switch (802c) are arranged in the shunt channel (802); the diversion channel first switch (802a), diversion channel second switch (802b), diversion channel third switch (802c) are respectively located between the first slit (804) and the inlet end of the rock plate holder (8), between the first slit (804) and the second slit (805), between the second slit (805), and between the third slit (806);
a first bus channel switch (803a), a second bus channel switch (803b) and a third bus channel switch (803c) are arranged in the bus channel (803); the first switch (803a), the second switch (803b) and the third switch (803c) of the confluence channel are respectively positioned at the intersection of the first crack (804), the second crack (805), the third crack (806) and the confluence channel (803);
the fourth step: measuring the volume V of the first fracture (804)aOpening a first switch (802a) of a diversion channel and a first switch (803a) of a confluence channel, opening a liquid control valve (3), starting a liquid pump (2), pumping water containing color markers in a liquid storage tank (1) into a rock plate holder (8) until a first crack (804) is completely immersed by water, and respectively recording the volume V of the water entering and flowing out of the rock plate holder (8)1、V2Simultaneously calculating the total volume V of the pipeline and the water flowing through the diversion channel (802) and the confluence channel (803)3Obtaining a volume V of the first fracture (804)a＝V1-V2-V3After the recording is finished, closing the liquid control valve (3) and the liquid pump (2), and closing all switches;
the fifth step: measuring the volume V of the second fracture (805)bOpening a first switch (802a) of a diversion channel, a second switch (802b) of the diversion channel and a second switch (803b) of a confluence channel, opening a liquid control valve (3), starting a liquid pump (2), pumping the water containing the color marker in the liquid storage tank (1) into the rock plate holder (8) until the second crack (805) is completely immersed by the water,recording the volume V of water entering and leaving the rock plate holder (8), respectively4、V5And simultaneously calculating the total volume V of water flowing through the diversion channel (802) and the confluence channel (803)6Obtaining a second fracture volume Vb＝V4-V5-V6After the recording is finished, closing the liquid control valve (3) and the liquid pump (2), and closing all switches;
and a sixth step: measuring the volume V of the third fracture (806)cOpening a first switch (802a), a second switch (802b), a third switch (802c) and a third switch (803c) of a confluence channel of a diversion channel, opening a liquid control valve (3), starting a liquid pump (2), pumping water containing a color marker into a rock plate holder (8) until a third crack (806) is completely submerged by water, and respectively recording the volume V of the water entering and flowing out of the rock plate holder (8)7、V8Simultaneously calculating the total volume V of the liquid flowing through the flow dividing channel (802) and the flow converging channel (803)9Obtaining a third fracture (806) volume of Vc＝V7-V8-V9After the recording is finished, closing the liquid control valve (3) and the liquid pump (2), and closing all switches;
the seventh step: measuring the drainage gas recovery efficiency K of the first fracture (804)1Opening a first switch (802a) of a diversion channel and a first switch (803a) of a confluence channel, pumping gas, opening a gas control valve (7), starting a gas pump (6), pumping the gas into a rock plate holder (8), and recording the volume V of the displaced water10Observing the distribution rule of the residual water in the first crack (804) through a visual glass cover, closing the gas control valve (7) and the gas pump (6) after recording, closing all switches, and calculating the drainage and gas production efficiency of the first crack (804)
Eighth step: measuring the second fracture (805) drainage gas recovery efficiency K2Opening a first switch (802a) of a diversion channel, a second switch (802b) and a second switch (803b) of a confluence channel, pumping gas, opening a gas control valve (7), starting a gas pump (6), pumping the gas into a rock plate holder (8), and recording the volume V of the displaced water11By passingThe visual glass cover observes the distribution rule of the residual water in the second crack (805), the gas control valve (7) and the gas pump (6) are closed after the recording is finished, all switches are closed, and the drainage and gas production efficiency of the second crack (805) is calculated
The ninth step: measuring the water drainage gas recovery efficiency K of the third fracture (806)3Opening a first switch (802a) of a diversion channel, a second switch (802b) of the diversion channel, a third switch (802c) of the diversion channel and a third switch (803c) of a confluence channel, pumping gas, opening a gas control valve (7), starting a gas pump (6), pumping the gas into a rock plate holder (8), and recording the volume V of the displaced water12Observing the distribution rule of the residual water in the third crack (806), closing the gas control valve (7) and the gas pump (6) after recording, closing all the switches, and calculating the drainage and gas recovery efficiency of the third crack
The tenth step: measuring drainage gas recovery efficiency K when simultaneously displacing a first fracture (804) and a second fracture (805)4Opening a first switch (802a) and a second switch (802b) of a shunting channel, opening a first switch (803a) and a second switch (803b) of a confluence channel, opening a liquid control valve (3) and a liquid pump (2), pumping water to fill a first crack (804) and a second crack (805), closing the liquid control valve (3) and the liquid pump (2), opening a gas control valve (7) and a gas pump (6), and recording the volume V of discharged water15Simultaneously calculating the total volume V of the gas flow in the pipeline and the rock plate holder (8) through the diversion channel (802) and the confluence channel (803)16Calculating the water drainage and gas production efficiency
The eleventh step: measuring drainage gas recovery efficiency K when simultaneously displacing a first fracture (804) and a third fracture (805)5Opening a first switch (802a) of the shunt channel, a second switch (802b) of the shunt channel, and a third switch (802c) of the shunt channel) And a first switch (803a) and a third switch (803c) of the confluence channel, the liquid control valve (3) and the liquid pump (2) are opened, water is pumped to fill the first crack (804) and the third crack (805), the liquid control valve (3) and the liquid pump (2) are closed, the gas control valve (7) and the gas pump (6) are opened, and the volume V of the discharged water is recorded17Simultaneously calculating the total volume V of the gas in the pipeline and the rock plate holder (8) passing through the diversion channel (802) and the confluence channel (803)18Calculating the water drainage and gas production efficiency
The twelfth step: measuring drainage gas recovery efficiency K while simultaneously displacing second fracture (805) and third fracture (806)6Opening a first switch (802a) of a diversion channel, a second switch (802b) of the diversion channel, a third switch (802c) of the diversion channel, a second switch (803b) of a confluence channel and a third switch (803c), opening a liquid control valve (3) and a liquid pump (2), pumping water to fill a second crack (805) and a third crack (806), closing the liquid control valve (3) and the liquid pump (2), opening a gas control valve (7) and a gas pump (6), and recording the volume V of the discharged water19Simultaneously calculating the total volume V of the gas in the pipeline and the rock plate holder (8) passing through the diversion channel (802) and the confluence channel (803)20Calculating the water drainage and gas production efficiency
The thirteenth step: measuring drainage gas production efficiency K when a first crack (804), a second crack (805) and a third crack (806) are displaced simultaneously7Opening all switches, opening the liquid control valve (3) and the liquid pump (2), pumping water to fill the three cracks, closing the liquid control valve (3) and the liquid pump (2), opening the gas control valve (7) and the gas pump (6), and recording the volume V of discharged water21Simultaneously calculating the total volume V of the gas in the pipeline and the rock plate holder (8) passing through the diversion channel (802) and the confluence channel (803)22Calculating the water drainage and gas production efficiency
The fourteenth step is that: and comparing the drainage gas production efficiency, and analyzing the influence rule of the crack form and the crack number on the drainage gas production efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910662253.8A CN110410052B (en) | 2019-07-22 | 2019-07-22 | Device and method for simulating shale gas reservoir fracture drainage gas recovery efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910662253.8A CN110410052B (en) | 2019-07-22 | 2019-07-22 | Device and method for simulating shale gas reservoir fracture drainage gas recovery efficiency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110410052A CN110410052A (en) | 2019-11-05 |
| CN110410052B true CN110410052B (en) | 2020-04-17 |
Family
ID=68362338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910662253.8A Active CN110410052B (en) | 2019-07-22 | 2019-07-22 | Device and method for simulating shale gas reservoir fracture drainage gas recovery efficiency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110410052B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112304843B (en) * | 2020-10-12 | 2022-09-30 | 四川省科源工程技术测试中心 | Quantitative characterization method for shale gas adsorption capacity in shale |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7198107B2 (en) * | 2004-05-14 | 2007-04-03 | James Q. Maguire | In-situ method of producing oil shale and gas (methane) hydrates, on-shore and off-shore |
| CN102094641B (en) * | 2010-12-28 | 2013-08-21 | 中国海洋石油总公司 | Fracturing filling sand prevention model |
| CN104533404B (en) * | 2014-12-09 | 2017-04-05 | 中国石油集团川庆钻探工程有限公司 | The visual experimental apparatus of the complicated seam net inner support agent migration of simulation |
| CN105735965B (en) * | 2016-04-07 | 2018-09-14 | 中国地质大学（武汉） | Coal bed gas well pit shaft internal drainage gas production visual Simulation experimental provision and analogy method |
| CN106337677B (en) * | 2016-10-17 | 2019-03-26 | 长江大学 | Shale gas pressure-break net air water two-phase flow conductivity test macro and test method |
| CN106437671B (en) * | 2016-11-22 | 2019-12-24 | 西南石油大学 | Visual crack type rock plate acid liquor etching experimental device and experimental method |
| CN108333098B (en) * | 2018-05-03 | 2023-12-01 | 西南石油大学 | Shale gas reservoir microcrack high-temperature high-pressure visual gas-water two-phase seepage experimental device |
| CN109268004B (en) * | 2018-09-21 | 2020-06-26 | 北京科技大学 | Shale gas reservoir medium structure coupling and seam network state identification method |
| CN109307755B (en) * | 2018-10-25 | 2021-06-01 | 中国石油天然气股份有限公司 | Physical simulation experiment device and method for gas reservoir water invasion and water drainage gas production |
-
2019
- 2019-07-22 CN CN201910662253.8A patent/CN110410052B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110410052A (en) | 2019-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105569624B (en) | A kind of experimental method and device of physical analogy huff and puff oil recovery | |
| CN101984217B (en) | Core pretreatment method for fractured reservoir damage evaluation | |
| CN104314514B (en) | A kind of fractured reservoir Weak Gels profile control performance evaluation visual experimental apparatus and method | |
| CN108152186B (en) | Experimental device for simulating fracture network two-phase flow flowing under coupling action in complex underground environment | |
| CN109001438A (en) | A kind of joint seal gas shutoff experimental simulation device and test method | |
| CN104612674A (en) | Simulate fracture-cavity type carbonate reservoir huff and puff test device and method | |
| CN104863557A (en) | Experimental device and method of super heavy oil reservoir steam-nitrogen-viscosity reducer composite steam stimulation | |
| CN106351622A (en) | High-temperature microscopic visual physical simulation clamping model and use method thereof | |
| CN104459034A (en) | Cavity construction physical simulation device and method of single-well single-cavity salt-cavern gas storage | |
| CN205025459U (en) | Staged fracturing horizontal well production profile testing string | |
| CN103674593B (en) | A kind of device and method for simulating the flood pot test of low permeability reservoir pressure break straight well | |
| CN103352695A (en) | Visualization physical simulation device with consideration of interlamination fluid channeling | |
| CN103527182B (en) | Viscous crude gravity water drainage assisted steam flooding vertical point of different experimental facilities | |
| CN110410052B (en) | Device and method for simulating shale gas reservoir fracture drainage gas recovery efficiency | |
| CN104695938A (en) | Experimental device and method for mechanical sealing through ball sealers | |
| CN201428446Y (en) | Fractured reservoir physical simulation experimental device | |
| CN106640042A (en) | Device and method for evaluating single well productivity of gas well | |
| CN204140039U (en) | The visual water drive oil physical model of fractured reservoir and physical simulation experiment device | |
| CN107939363A (en) | Simulate the Visualization Model of fluid flowing and preparation and application in compact oil reservoir crack | |
| CN204152479U (en) | Fractured reservoir Weak Gels profile control performance evaluation visual experimental apparatus | |
| CN114739769A (en) | High-temperature high-pressure visualization device and method for simulating alternative injection and production of gas reservoir type gas storage | |
| CN204252993U (en) | Ball sealer machine plugging experimental facilities | |
| CN207248869U (en) | A kind of compact rock core vacuumizes saturation device | |
| CN106401544B (en) | The displacement pressure of constant speed and constant pressure water drive oil displacement experiment determines method and system | |
| CN110905496B (en) | Gas drive overlap simulation device and use method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Building 1, No. 919, Section 1, Kehui Road, Wenjiang District, Chengdu City, Sichuan Province, 611130 Patentee after: Sichuan Keyuan Engineering Technology Test Center Co.,Ltd. Address before: Unit 1, building 5, 229 Jingye Road, Qingyang District, Chengdu, Sichuan 610000 Patentee before: KEYUAN ENGINEERING TECHNICAL TEST CENTER OF SICHUAN PROVINCE |