CN104564043B - A kind of diversion chamber of gas test compact reservoir seam net flow conductivity and its method of work - Google Patents

A kind of diversion chamber of gas test compact reservoir seam net flow conductivity and its method of work Download PDF

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Publication number
CN104564043B
CN104564043B CN201410794850.3A CN201410794850A CN104564043B CN 104564043 B CN104564043 B CN 104564043B CN 201410794850 A CN201410794850 A CN 201410794850A CN 104564043 B CN104564043 B CN 104564043B
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flow
mrow
flow conductivity
test
diversion chamber
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CN104564043A (en
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温庆志
高金剑
罗明良
刘华
刘欣佳
王峰
王淑婷
段晓飞
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China University of Petroleum UPC East China
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China University of Petroleum UPC East China
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/10Locating fluid leaks, intrusions or movements

Abstract

The present invention relates to a kind of diversion chamber of gas test compact reservoir seam net flow conductivity, the diversion chamber can merge with API flow conductivity testers, cost-effective;Using rocks such as real stratum shale or tight sands, truer simulated formation lithology, it is contemplated that injury of the proppant embedment to flow conductivity, and fracture width, seam web frame are variable;The flow pattern of the diversion chamber is not radial flow for linear flow, and linear flow can not ensure that there is tested media in crack by the way that radial flow can improve the scope that involves of tested media, improve flow conductivity test accuracy in seam net.

Description

A kind of diversion chamber of gas test compact reservoir seam net flow conductivity and its method of work
Technical field
The present invention relates to a kind of diversion chamber of gas test compact reservoir seam net flow conductivity and its method of work, belong to oil Gas field development field.
Background technology
Tight gas refer to that covering pressure matrix permeability is less than or equal to 0.1 × 10-3μm2Sandstone reservoir, shale gas is a kind of Special Unconventional gas, preservation in mud stone or shale, have from be born from storage, air free water interface, large area continuously into Tibetan, Low hole, extremely low permeability (are less than 0.001 × 10-3μm2) etc. feature.Tight gas and shale gas individual well are typically without natural production capacity or certainly Right production capacity is less than industrial gas lower limit, but natural gas of industry yield can be obtained under certain economic condition and technical measures.Generally In the case of, these measures include pressure break, horizontal well, multilateral well etc..
Tight gas and shale gas pressure break generally use slippery water or clear water, it will be supported using high discharge capacity, the mode of low-viscosity Agent is entrained into stratum, and to reach communication intrinsic fracture, the effect of complex fracture network (seam net) is formed in stratum.Tight gas, The fundamental starting point of shale gas FRACTURING DESIGN is how to form effective fracture network, the direct shadow of flow conductivity of fracture network Yield after sound compact reservoir pressure, therefore, the research for compact reservoir fracture network flow conductivity is for improving well stimulation Effect is significant.
Proppant is entrained into stratum by traditional hydraulic fracturing mode using high viscosity fracturing fluid, and a tool is formed in stratum There is the sand packed fracture of high flow conductivity, fracture guide instrument can be used to leading for the flow conductivity in the crack of a filling proppant Stream ability is evaluated, and this technology is more ripe, existing related standard:SY/T6302-1997;For being arranged using acidifying It is also more ripe to apply the research method of the flow conductivity of formed acid-etched fracture, and forms the theory of systematization and comments Level system.The evaluation method of two kinds of traditional fracture condudtiviies is not directly applicable the fracture network that volume fracturing is formed Network.
At present, the flow conductivity that fracture network is formed to volume fracturing is mostly qualitatively to be described, and it is suitable to lack Experimental facilities and method carry out quantitative analysis to this.The seepage flow that 2010 Nian Luzhan states et al. have been carried out in orthogonal fracture network is special Experimental study is levied, the influence of seepage flow characteristics and model structure to permeability in orthogonal fracture network model is studied, utilizes marble Set up the orthogonal fracture network model of different structure with stainless steel gasket, and aqueous phase and profit two by PHYSICAL MODELING OF IN The seepage flow characteristics of phase.But its object studied is Fractured Reservoir, and what is considered is percolation flow velocity of the fracture network to liquid phase Influence.Wen Qingzhi in 2013 et al. proposes that by complex fracture network discretization be by the horizontal fracture parallel to seepage direction, flat The seam network model of vertical fracture of the row in seepage direction, three kinds of crack compositions of vertical fracture perpendicular to seepage direction, analysis The influences of different seam web frame fracture network flow conductivities.Lu Qiang in 2014 is proposed caused by volume fracturing with He Yan peaks A rectangular recess is regarded in crack as, using the template with different connected mode grooves come simulation fracture network.Domestic patent " a kind of device and its method of work for testing shale gas checking seam network flow conductivity " (Chinese patent CN102720486A) is proposed With marble simulation shale seam net, the brand-new seam net flow conductivity test system that flow pattern is linear flow.Multi-purpose Dali at present Stone or groove version simulation fracture network, the difference in lithology is larger with formation rock for marble, can not simulate real formation rock Property;It has ignored under high clossing pressure, the embedded injury of proppant;Flow pattern is single linear stream, can not real simulation seam net flowing State;Whole system needs to redesign, and cost is higher.
The content of the invention
In view of the shortcomings of the prior art, a kind of diversion chamber of gas test compact reservoir seam net flow conductivity, the diversion chamber It can be merged with API flow conductivity testers, it is cost-effective;Using rocks such as real stratum shale or tight sands, more truly Simulated formation lithology, it is contemplated that injury of the proppant embedment to flow conductivity, and fracture width, seam web frame are variable;The water conservancy diversion The flow pattern of room is not radial flow for linear flow, and linear flow can not ensure that crack has tested media to pass through radial flow in seam net The scope that involves of tested media can be improved, improves flow conductivity test accuracy.
The present invention also provides a kind of method of work of above-mentioned diversion chamber.
Technical scheme is as follows:
A kind of diversion chamber of gas test compact reservoir seam net flow conductivity, including up/down perforation set test trough, in institute State the top sealing top plate set of test trough and the seal base set in the bottom of the test trough;Test trough is used for disposing Seam web frame to be tested and sand bedding, the test trough horizontal cross-section are square, the inner edge a length of 250 of the test trough~ 300mm, the test slot thickness is 25~30mm;Air inlet and pressure tap are provided with each side of test trough, institute The air inlet that air inlet is stated with API flow conductivity testers is connected, the pressure tap and API flow conductivity tester pressure tap phases Even;Seal base insertion is provided with the simulation wellbore hole of perforation, a diameter of 8~11mm of the simulation wellbore hole, the mould The surface for intending pit shaft is provided with perforation, and simulation wellbore hole top is provided with filter screen;The bottom of the simulation wellbore hole is provided with use In the gas outlet of test outlet pressure.Diversion chamber of the present invention, it stitches web frame, sanding varying concentrations, and matrix is shale Or the formation rock such as tight sand, in build joint net, first process rock beam and be laid in the test trough, according to default seam Web frame places one layer of rock beam, and proppant is laid in the crack constructed on rock beam with rock beam, then successively places rock beam, build joint Web frame.Diversion chamber of the present invention, which can realize, reads seam web frame height to air inlet flow, terminal pressure, displacement meter Change, gas outlet flow, gas outlet pressure and other parameters monitoring.
The effect of the pressure tap is to measure the terminal pressure of the diversion chamber, when the pressure for measuring four pressure taps is equal When, then judge that diversion chamber reaches stable state, starts counting up;Four air inlets are to ensure that the flow pattern in seam web frame is footpath Xiang Liu, expand tested media and involve scope.The length of the simulation wellbore hole is variable, and pit shaft perforation flows into stitch gas in net Pit shaft, aperture is sufficiently small to prevent proppant from flowing into pit shaft, gas outlet is provided with the seal base, with simulation wellbore hole Connection, can test rate of discharge and outlet pressure.
According to currently preferred, the pressure tap diameter is adapted with API flow conductivity tester pressure tap diameters.
According to currently preferred, a diameter of 6.35mm of pressure tap;A diameter of 5~8mm of the air inlet.
According to currently preferred, the sealing top plate includes top plate and upper sealing-plug, and the seal base includes bottom plate With lower sealing-plug.
According to currently preferred, the through of the seal base is provided with simulation wellbore hole.
According to currently preferred, the thickness of the sealing top plate and seal base is 10~15mm;The upper sealing The thickness of plug is 40~50mm;The thickness of the lower sealing-plug is 20~25mm.
According to currently preferred, the surface of sealing-plug and lower sealing-plug is provided with seal groove on described, described close Sealed film is provided with sealing groove, the thickness of the sealed film is 5~7mm.
Using the method for above-mentioned diversion chamber test compact reservoir fracture network flow conductivity, comprise the following steps:
(1) formation rock, i.e. shale or tight sand are chosen, the formation rock is processed into tabular rock core;
(2) according to default seam web frame, different segments is cut into by the tabular rock core is horizontal and vertical, and load In test trough;
(3) by adding proppant, diaclase bar number and seam web frame:I.e. by the proppant that adds different-grain diameter or The control of fracture network slit width is realized using different sanding concentration;
(4) diversion chamber is installed, four air inlets are connected with the air inlet of API flow conductivity testers;
(5) acquisition and control system of API water conservancy diversion testers is opened, default closure pressure is forced into the diversion chamber Power, the clossing pressure refer to act on the wall of crack the power for making crack closure, generally equal to minimum principal stress;Led described Flow chamber lays displacement meter, initial value 0;
(6) it is maintained under the conditions of default clossing pressure, to air inlet air inlet simultaneously, while measures in the diversion chamber Terminal pressure, when four pressure taps measure pressure it is identical when, then judge that the diversion chamber is in stable state, start to test, Gathered data;
(7) outer computer is opened, all data are transferred in computer by data acquisition device in experimentation: Obtain air inlet flow, the terminal pressure that pressure tap measures, gas outlet flow, gas outlet pressure, displacement meter reading;
(8) flowing gas state is radial flow, and according to area equation, the plan radius for calculating rectangular channel isRoot Go out to stitch net flow conductivity calculation formula according to radial flow formula and the flow conductivity derivation of equation,
The calculation formula of fracture network flow conductivity uses:
wf- effective slit width, this effective slit width are conversion slit width, are calculated in fracture network after the cumulative volume in crack, divided by The cross-sectional area of diversion chamber, gained are effective slit width;
kfThe permeability of-fracture network, gas flow rate is controlled, gas seepage flow in fracture network is met darcy flow;
Q-flow, is read by gas flowmeter;
μ-viscosity, take N at room temperature2Viscosity;
A-test trough the length of side;
rw- simulation wellbore hole radius;
H-seam web frame height;
pe- test trough terminal pressure;
po- gas outlet pressure;
π-constant, its value are 3.1415926;
(9) insert depth calculates:
The changing value Δ w of seam web frame height is measured using the displacement meter, it is known that the bar number of horizontal fracture is n, meter The insert depth of the proppant is calculated, calculation formula is as follows:
D-insert depth in formula;
Δ w-seam web frame height change value;
N-horizontal fracture bar number.
Beneficial effects of the present invention:
1) present invention can simulate different seam web frames by improving the diversion chamber for testing seam net flow conductivity and method And fracture width, it can be merged with existing API diversion chamber, system is cost-effective without redesigning.
2) reservoir rock such as shale and tight sand, more accurate simulated formation lithology, it is contemplated that proppant embedment pair are used The injury of flow conductivity so that experiment is more accurate.
3) present invention can measure the flow conductivity under different seam web frames, different sanding concentration.
4) tested media nowed forming of the present invention is radial flow, expands tested media and involves scope, improves water conservancy diversion energy Power test accuracy.
5) diversion chamber of the present invention is easy to use, safe ready, and new method is provided for seam net flow conductivity test;Institute Stating diversion chamber can merge with API flow conductivity testers, gas cylinder, gas flowmeter, differential manometer, displacement meter, data acquisition and control The systems such as system processed, computer are held essentially constant, without redesigning whole system.
Brief description of the drawings:
Fig. 1 is a kind of fractionation front view of the diversion chamber of gas test compact reservoir seam net flow conductivity of the present invention;
Fig. 2 is the overall schematic of seam web frame of the present invention;
Fig. 3 is the top view of diversion chamber of the present invention;
In fig. 1-3:1-fixed screw;2-sealing top plate;3-go up sealing-plug;4-test trough;5-air inlet;6— Pressure tap;7-simulation wellbore hole;8-preforation tunnel;9-lower sealing-plug;10-seal base;11-gas outlet;12-level is split Seam;13-transverse crack;14-tabular rock core;15-vertical fracture.
Embodiment
The present invention is described in detail with reference to embodiment, but not limited to this.
As Figure 1-3.
Embodiment 1,
Vertical fracture in research seam web frame, such as the bar number fracture network flow conductivity of the vertical fracture 15 in Fig. 1 Influence.Shale core is processed into size identical tabular rock core with cutting machine, length is 50~60mm, 50~60mm of width, Thickness is 12~15mm;By whether adding proppant, vertical fracture bar number is controlled, to the crack do not studied, does not add support Agent, directly close;Singly slit width, proppant, sanding concentration are identical in seam net, are assembled into the different fracture network of vertical fracture bar number Network model.The fracture network flow conductivity of different models is measured, so as to show that the bar number fracture network of vertical fracture is led The influence of stream ability.
A kind of diversion chamber of gas test compact reservoir seam net flow conductivity, including up/down perforation set test trough 4, in institute State the top sealing top plate 2 set of test trough 4 and the seal base 10 set in the bottom of the test trough;Test trough 4 is used To dispose seam web frame and sand bedding to be tested, the horizontal cross-section of test trough 4 is square, the inner edge of the test trough 4 A length of 250~300mm, the thickness of test trough 4 are 25~30mm;Air inlet 5 is provided with each side of test trough 4 With pressure tap 6, the air inlet 5 is connected with the air inlet of API flow conductivity testers, the pressure tap 6 and API flow conductivities Tester pressure tap is connected;The seal base 10 insertion is provided with the simulation wellbore hole 7 of perforation 8, the simulation wellbore hole 7 it is straight Footpath is 8~11mm, and the surface of the simulation wellbore hole 7 is provided with perforation 8, and the top of simulation wellbore hole 7 is provided with filter screen;In the mould The bottom of plan pit shaft 7 is provided with the gas outlet 11 for testing outlet pressure.
The diameter of pressure tap 6 is adapted with API flow conductivity tester pressure tap diameters.
The a diameter of 6.35mm of pressure tap;A diameter of 5~8mm of the air inlet.
The sealing top plate includes top plate and upper sealing-plug 3, and the seal base includes bottom plate and lower sealing-plug 9.
Embodiment 2,
A kind of diversion chamber of gas test compact reservoir seam net flow conductivity, its distinctive points are as described in Example 1, The through of the seal base is provided with simulation wellbore hole 7.
The thickness of the sealing top plate and seal base is 10~15mm;The thickness of the upper sealing-plug be 40~ 50mm;The thickness of the lower sealing-plug is 20~25mm.
The surface of sealing-plug and lower sealing-plug is provided with seal groove on described, and fluid sealant is provided with the seal groove Piece, the thickness of the sealed film is 5~7mm.
Embodiment 3,
The method for testing compact reservoir fracture network flow conductivity using the diversion chamber as described in embodiment 1 or 2, including it is following Step:
(1) formation rock, i.e. shale or tight sand are chosen, the formation rock is processed into tabular rock core;
(2) according to default seam web frame, different segments is cut into by the tabular rock core is horizontal and vertical, and load In test trough;
(3) by adding proppant, diaclase bar number and seam web frame:I.e. by the proppant that adds different-grain diameter or The control of fracture network slit width is realized using different sanding concentration;
(4) diversion chamber is installed, four air inlets are connected with the air inlet of API flow conductivity testers;
(5) acquisition and control system of API water conservancy diversion testers is opened, default closure pressure is forced into the diversion chamber Power, the clossing pressure refer to act on the wall of crack the power for making crack closure, generally equal to minimum principal stress;Led described Flow chamber lays displacement meter, initial value 0;
(6) it is maintained under the conditions of default clossing pressure, to air inlet air inlet simultaneously, while measures in the diversion chamber Terminal pressure, when four pressure taps measure pressure it is identical when, then judge that the diversion chamber is in stable state, start to test, Gathered data;
(7) outer computer is opened, all data are transferred in computer by data acquisition device in experimentation: Obtain air inlet flow, the terminal pressure that pressure tap measures, gas outlet flow, gas outlet pressure, displacement meter reading;
(8) flowing gas state is radial flow, and according to area equation, the plan radius for calculating rectangular channel isRoot Go out to stitch web frame flow conductivity calculation formula according to radial flow formula and the flow conductivity derivation of equation,
The calculation formula of fracture network flow conductivity uses:
wf- effective slit width, this effective slit width are conversion slit width, are calculated in fracture network after the cumulative volume in crack, divided by The cross-sectional area of diversion chamber, gained are effective slit width;
kfThe permeability of-fracture network, gas flow rate is controlled, gas seepage flow in fracture network is met darcy flow;
Q-flow, is read by gas flowmeter;
μ-viscosity, take N at room temperature2Viscosity;
A-test trough the length of side;
rw- simulation wellbore hole radius;
H-seam web frame height;
pe- test trough terminal pressure;
po- gas outlet pressure;
π-constant, its value are 3.1415926;
(9) insert depth calculates:
The changing value Δ w of seam web frame height is measured using the displacement meter, it is known that the bar number of horizontal fracture is n, meter The insert depth of the proppant is calculated, calculation formula is as follows:
D-insert depth in formula;
Δ w-seam web frame height change value;
N-horizontal fracture bar number.
Embedding depth of proppant is calculated, contrasts the insert depth of different rocks, studies the embedded injury of proppant.
Change the bar number V of vertical fracture 15 in embodiment 3;13 described 12 number H of horizontal fracture, transverse crack number T are not Becoming, sanding concentration keeps constant, and it is 60MPa to be loaded into clossing pressure, tests 2h flow conductivity, experimental data such as table 1 below, Table 2:
The vertical fracture opposite joint net flow conductivity of table 1 influences test data
The insert depth test data of table 2 and comparative analysis
It can be seen that from above-mentioned table 1,2, diversion chamber of the present invention can test the flow conductivity of different seam web frames, analysis It influences relation;Embedding depth of proppant can be tested, it is smaller with the insert depth error of actual measurement, can more accurately it measure embedded deep Degree.
Embodiment 4:
The horizontal fracture in research fracture network is carried out, such as the bar number fracture network water conservancy diversion of horizontal fracture 12 in Fig. 1 The influence of ability.Proppant is not added using part of horizontal crack, the method directly closed, changes the bar number of horizontal fracture, protects It is constant to hold fracture network model of analogous outcrop other specification.Proppant is separately added into fracture network model of analogous outcrop, ensures the width singly stitched in seam net Spend all same.The fracture network flow conductivity under varying level Number of Fractures is measured respectively, so as to draw the bar number of horizontal fracture The influence of fracture network flow conductivity.
The method for testing compact reservoir fracture network flow conductivity using the diversion chamber as described in embodiment 1 or 2, including it is following Step:
(1) formation rock, i.e. shale or tight sand are chosen, the formation rock is processed into tabular rock core;
(2) according to default seam web frame, different segments is cut into by the tabular rock core is horizontal and vertical, and load In test trough;
(3) by adding proppant, diaclase bar number and seam web frame:I.e. by the proppant that adds different-grain diameter or The control of fracture network slit width is realized using different sanding concentration;
(4) diversion chamber is installed, four air inlets are connected with the air inlet of API flow conductivity testers;
(5) acquisition and control system of API water conservancy diversion testers is opened, default closure pressure is forced into the diversion chamber Power, the clossing pressure refer to act on the wall of crack the power for making crack closure, generally equal to minimum principal stress;Led described Flow chamber lays displacement meter, initial value 0;
(6) it is maintained under the conditions of default clossing pressure, to air inlet air inlet simultaneously, while measures in the diversion chamber Terminal pressure, when four pressure taps measure pressure it is identical when, then judge that the diversion chamber is in stable state, start to test, Gathered data;
(7) outer computer is opened, all data are transferred in computer by data acquisition device in experimentation: Obtain air inlet flow, the terminal pressure that pressure tap measures, gas outlet flow, gas outlet pressure, displacement meter reading;
(8) flowing gas state is radial flow, and according to area equation, the plan radius for calculating rectangular channel isRoot Go out to stitch web frame flow conductivity calculation formula according to radial flow formula and the flow conductivity derivation of equation,
The calculation formula of fracture network flow conductivity uses:
wf- effective slit width, this effective slit width are conversion slit width, are calculated in fracture network after the cumulative volume in crack, divided by The cross-sectional area of diversion chamber, gained are effective slit width;
kfThe permeability of-fracture network, gas flow rate is controlled, gas seepage flow in fracture network is met darcy flow;
Q-flow, is read by gas flowmeter;
μ-viscosity, take N at room temperature2Viscosity;
A-test trough the length of side;
rw- simulation wellbore hole radius;
H-seam web frame height;
pe- test trough terminal pressure;
po- gas outlet pressure;
π-constant, its value are 3.1415926;
(9) insert depth calculates:
The changing value Δ w of seam web frame height is measured using the displacement meter, it is known that the bar number of horizontal fracture is n, meter The insert depth of the proppant is calculated, calculation formula is as follows:
D-insert depth in formula;
Δ w-seam web frame height change value;
N-horizontal fracture bar number.
Change the bar number of horizontal fracture in embodiment 4, vertical fracture (V), transverse crack (T) bar are constant, and sanding concentration is equal Keep constant, it is 60MPa to be loaded into clossing pressure, tests 2h flow conductivity.Experimental data such as table 3 below, 4.
The horizontal fracture opposite joint net flow conductivity of table 3 influences test data
The insert depth test data of table 4 and comparative analysis

Claims (7)

1. a kind of method of diversion chamber's test compact reservoir fracture network flow conductivity, the gas test compact reservoir being directed to The diversion chamber of net flow conductivity is stitched, including up/down perforation sets test trough, the sealing top plate set at the top of the test trough With the seal base set in the bottom of the test trough;Test trough is used for disposing seam web frame and sand bedding to be tested, institute Test trough horizontal cross-section is stated as square, inner edge a length of 250~300mm of the test trough, the test slot thickness is 25~ 30mm;Air inlet and pressure tap, the air inlet and API flow conductivity testers are provided with each side of test trough Air inlet be connected, the pressure tap is connected with API flow conductivity tester pressure taps;It is provided with seal base insertion The simulation wellbore hole of perforation, a diameter of 8~11mm of the simulation wellbore hole, the surface of the simulation wellbore hole is provided with perforation, in mould Intend pit shaft top and be provided with filter screen;The bottom of the simulation wellbore hole is provided with the gas outlet for testing outlet pressure;
It the described method comprises the following steps:
(1) formation rock, i.e. shale or tight sand are chosen, the formation rock is processed into tabular rock core;
(2) according to default seam web frame, different segments is cut into by the tabular rock core is horizontal and vertical, and load test In groove;
(3) by adding proppant, diaclase bar number and seam web frame:Pass through the proppant for adding different-grain diameter or use Different sanding concentration realizes the control of fracture network slit width;
(4) diversion chamber is installed, the air inlet is connected with the air inlet of API flow conductivity testers;
(5) acquisition and control system of API water conservancy diversion testers is opened, default clossing pressure is forced into the diversion chamber, The clossing pressure refers to act on the wall of crack the power for making crack closure, generally equal to minimum principal stress;In the water conservancy diversion Lay displacement meter, initial value 0 in room;
(6) it is maintained under the conditions of default clossing pressure, to air inlet air inlet simultaneously, while measures the side in the diversion chamber Boundary's pressure, when pressure tap measure pressure it is identical when, then judge that the diversion chamber is in stable state, start to test, gathered data;
(7) outer computer is opened, all data are transferred in computer by data acquisition device in experimentation:Obtain Obtain air inlet flow, the terminal pressure that pressure tap measures, gas outlet flow, gas outlet pressure, displacement meter reading;
(8) flowing gas state is radial flow, and according to area equation, the plan radius for calculating rectangular channel isAccording to radial flow Formula goes out to stitch web frame flow conductivity calculation formula with the flow conductivity derivation of equation,
The calculation formula of fracture network flow conductivity uses:
<mrow> <msub> <mi>k</mi> <mi>f</mi> </msub> <msub> <mi>w</mi> <mi>f</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Q&amp;mu;w</mi> <mi>f</mi> </msub> <mi>l</mi> <mi>n</mi> <mo>&amp;lsqb;</mo> <mi>a</mi> <mo>/</mo> <mrow> <mo>(</mo> <msub> <mi>r</mi> <mi>w</mi> </msub> <msqrt> <mi>&amp;pi;</mi> </msqrt> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> <mrow> <mn>2</mn> <mi>&amp;pi;</mi> <mi>h</mi> <mrow> <mo>(</mo> <msub> <mi>p</mi> <mi>e</mi> </msub> <mo>-</mo> <msub> <mi>p</mi> <mi>o</mi> </msub> <mo>)</mo> </mrow> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mi>i</mi> <mo>)</mo> </mrow> </mrow>
wf- effective slit width, this effective slit width are conversion slit width, are calculated in fracture network after the cumulative volume in crack, divided by water conservancy diversion The cross-sectional area of room, gained are effective slit width;
kfThe permeability of-fracture network, gas flow rate is controlled, gas seepage flow in fracture network is met darcy flow;
Q-flow, is read by gas flowmeter;
μ-viscosity, take N at room temperature2Viscosity;
A-test trough the length of side;
rw- simulation wellbore hole radius;
H-seam web frame height;
pe- test trough terminal pressure;
po- gas outlet pressure;
π-constant, its value are 3.1415926;
(9) insert depth calculates:
The changing value Δ w of seam web frame height is measured using the displacement meter, it is known that the bar number of horizontal fracture is n, calculates institute The insert depth of proppant is stated, calculation formula is as follows:
<mrow> <mi>d</mi> <mo>=</mo> <mfrac> <mrow> <mi>&amp;Delta;</mi> <mi>w</mi> </mrow> <mi>n</mi> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mi>i</mi> <mi>i</mi> <mo>)</mo> </mrow> </mrow>
D-insert depth in formula;
Δ w-seam web frame height change value;
N-horizontal fracture bar number.
2. the method for diversion chamber's test compact reservoir fracture network flow conductivity according to claim 1, it is characterised in that institute Pressure tap diameter is stated to be adapted with API flow conductivity tester pressure tap diameters.
3. the method for diversion chamber's test compact reservoir fracture network flow conductivity according to claim 1, it is characterised in that institute State a diameter of 6.35mm of pressure tap;A diameter of 5~8mm of the air inlet.
4. the method for diversion chamber's test compact reservoir fracture network flow conductivity according to claim 1, it is characterised in that institute Stating sealing top plate includes top plate and upper sealing-plug, and the seal base includes bottom plate and lower sealing-plug.
5. the method for diversion chamber's test compact reservoir fracture network flow conductivity according to claim 1, it is characterised in that The through of the seal base is provided with simulation wellbore hole.
6. the method for diversion chamber's test compact reservoir fracture network flow conductivity according to claim 4, it is characterised in that institute The thickness for stating sealing top plate and seal base is 10~15mm;The thickness of upper sealing-plug is 40~50mm;The thickness of lower sealing-plug Spend for 20~25mm.
7. the method for diversion chamber's test compact reservoir fracture network flow conductivity according to claim 4, it is characterised in that The surface of the upper sealing-plug and lower sealing-plug is provided with seal groove, and sealed film is provided with the seal groove, described close The thickness of sealing piece is 5~7mm.
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