CN102619502A - Method for determining crack permeability of crack-pore seepage experiment model - Google Patents
Method for determining crack permeability of crack-pore seepage experiment model Download PDFInfo
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- CN102619502A CN102619502A CN2012100753257A CN201210075325A CN102619502A CN 102619502 A CN102619502 A CN 102619502A CN 2012100753257 A CN2012100753257 A CN 2012100753257A CN 201210075325 A CN201210075325 A CN 201210075325A CN 102619502 A CN102619502 A CN 102619502A
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Abstract
The invention relates to a method for determining crack permeability of a crack-pore seepage experiment model. The method sequentially comprises the following steps of: (1) selecting a crack-free reservoir rock core, and acquiring pore seepage parameters phi0 and K0 of a base rock; (2) preparing stratum water and simulated oil; (3) cleaning, evacuating and then flooding the rock core by using the saturated stratum water, gas flooding water or the simulated oil at a stratum temperature to obtain the saturation Sw0 of the bound water of the base rock; (4) determining the effective permeability of a stratum test well as the phase permeability Kx of a stratum with cracks; (5) forming cracks in the rock core, and testing the total porosity phi of the rock core with different crack permeability; (6) calculating the saturation Swi=phi0*Sw0/phi of the bound water of the crack-pore stratum; and (7) establishing quantitative bound water Swi for the cracked rock core, and then performing phase permeability test to acquire the comprehensive permeability of the cracked base rock. The method for how to determine the comprehensive permeability of the cracks of the stratum is established, and is reliable in principle.
Description
Technical field
The fracture parameters that the present invention relates in crack-hole in the petroleum natural gas exploration field (hole) molding sand rock or the carbonate reservoir construction experimental model process is confirmed method.
Background technology
The seepage flow experiment is the important foundation experiment in the oil-gas field development; The seepage flow method of testing of standard only relates to the uniform sandstone reservoir; Do not consider the carbonate or the sandstone reservoir in band crack; Can't get the rock core in band crack during this type band fracture reservoir boring sample; Therefore do not have representativeness, how making this type of reservoir core also is the representational key of restriction test result, sets up crack-hole (hole) type reservoir core fracture parameters and confirms that method provides physical model more reliably to this type of reservoir seepage flow experiment.
Summary of the invention
The objective of the invention is to set up a cover crack--pore type seepage flow experimental model fracture permeabgility is confirmed method.
For reaching above technical purpose, the present invention provides following technical scheme.
The crack--pore type seepage flow experimental model fracture permeabgility is confirmed method, may further comprise the steps successively:
(1) rock core is chosen, the hole oozes test: because crack-hole (hole) type reservoir has the crack, can't get representational rock core and core, therefore select the free from flaw reservoir core (1-1.5 inch diameter) of representative reservoir earlier, survey core porosity (φ with gas
0) and permeability (K
0), ooze parameter phi with this hole as basement rock
0, K
0
(2) fluid formulation: water sample analysis data preparation formation water in stratum is provided according to the scene.Simultaneously according to stratum viscosity ratio of oil and water preparation simulated oil.
(3) under formation temperature, rock core is cleaned the saturated formation water in back of finding time, gas drive water (or simulated oil expelling water) on this basis, till not water outlet, the water saturation of this moment is basement rock irreducible water saturation S
W0Flow because crack Zhong Shui is very easy, do not have irreducible water, so basement rock irreducible water saturation S
W0The corresponding water yield is the constraint water yield in the reservoir just.
(4) reservoir well testing effective permeability is confirmed as the phase permeability K that is with fracture reservoir
x(representative considers that irreducible water influences the single-phase fracture reservoir permeability under the situation).
(5) the representative free from flaw rock core of choosing is made seam; Form the rock core of different fracture permeabgilitys (the permeability range of choice should be to consider to cover compressive stress influence back); Under the situation of confined pressure of preparing to experimentize and interior pressure reduction, test the total porosity φ and the permeability K of different fracture permeabgility rock cores, the matrix stress sensitivity influences in fracture-type reservoir not quite; Can not consider, so fracture porosity is: φ
f=φ-φ
0
(6) the water saturation S that confirms according to basement rock
W0The water saturation S of release in total fracture pore medium
Wi=φ
0* S
W0/ φ is the irreducible water saturation S of crack-pore type reservoir
Wi
(7) set up quantitative irreducible water S to making seam back rock core
WiAfter carry out phase permeability test, which kind of is seen makes the phase permeability and the well testing phase permeability K of seam back rock core
xApproaching, the promptly corresponding absolute permeability K that makes seam back rock core
fBe exactly the comprehensive fracture permeabgility of needed crack basement rock, if K
xBetween two absolute permeability K that make seam back rock core
Fi～K
Fi+1Between, then adopt interpolation processing to find to make the crack basement rock composite permeability K behind the seam, general K
0/ K is less, can regard fracture permeabgility as K; If the account temperature influence is then at high temperature tested by same steps as.
Compared with prior art, the present invention has following effect:
The present invention set up how to confirm the reservoir crack make the seam composite permeability method, principle is reliable.
The specific embodiment:
Further specify the present invention according to instance below.
The crack--pore type seepage flow experimental model fracture permeabgility is confirmed method, may further comprise the steps successively:
(1) the free from flaw reservoir core gas gaging hole (φ of the representative reservoir of selection
0=0.224%) oozes (K
0=0.00695 * 10
-3μ m
2);
(2) preparation formation water and simulated oil;
(3) the irreducible water saturation S of test basement rock
W0=45.4%;
(4) according to the definite phase permeability K that is with fracture reservoir of reservoir well testing permeability
x=14.7 * 10
-3μ m
2
(5) the free from flaw rock core of choosing is made seam, under the situation of confined pressure 35MPa for preparing to experimentize and interior pressure reduction 2.5MPa, total porosity φ=2.4% and permeability K=191.6 * 10 of seam back rock core is made in test
-3μ m
2, obtain fracture porosity φ
f=2.176%;
(6) the irreducible water saturation S of calculating fracture-pore type reservoir
Wi=4.24%;
(7) will make seam back rock core and set up irreducible water S
WiAfter carry out phase permeability test, the phase permeability that obtains making seam back rock core is 14.5 * 10
-3μ m
2With well testing phase permeability K
xApproaching, the promptly corresponding absolute permeability K that makes behind the seam
f=K=191.6 * 10
-3μ m
2Promptly 190 * 10
-3μ m
2About be exactly required fracture permeabgility.
Claims (1)
1. the crack--pore type seepage flow experimental model fracture permeabgility is confirmed method, may further comprise the steps successively:
(1) the free from flaw reservoir core of the representative reservoir of selection, its diameter is the 1-1.5 inch, surveys core porosity φ with gas
0With permeability K
0, ooze parameter phi as the hole of basement rock
0, K
0
(2) according to the scene water sample analysis data preparation formation water in stratum is provided, simultaneously according to stratum viscosity ratio of oil and water preparation simulated oil;
(3) under formation temperature, rock core is cleaned the saturated formation water in back of finding time, gas drive water or simulated oil expelling water till not water outlet, obtain the irreducible water saturation S of basement rock
W0
(4) reservoir well testing effective permeability is confirmed as the phase permeability K that is with fracture reservoir
x
(5) rock core is made seam, forms the rock core of different fracture permeabgilitys, test the total porosity φ of different fracture permeabgility rock cores:
(6) the irreducible water saturation S of calculating fracture-pore type reservoir
Wi=φ
0* S
W0/ φ;
(7) set up quantitative irreducible water S to making seam back rock core
WiAfter carry out phase permeability test, which kind of is seen makes the phase permeability and the well testing phase permeability K of seam back rock core
xApproaching, the promptly corresponding absolute permeability K that makes seam back rock core
fBe exactly needed crack basement rock composite permeability, if K
xBetween two absolute permeability K that make seam back rock core
Fi～K
Fi+1Between, then adopt interpolation processing to find to make the crack basement rock composite permeability K behind the seam.
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|---|---|---|---|
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| CN201210075325.7A CN102619502B (en) | 2012-03-21 | 2012-03-21 | Method for determining crack permeability of crack-pore seepage experiment model |
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| CN102619502A true CN102619502A (en) | 2012-08-01 |
| CN102619502B CN102619502B (en) | 2014-05-14 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149339A (en) * | 2013-01-29 | 2013-06-12 | 中国科学院力学研究所 | Single fracture unsaturated seepage test system |
| CN103410502A (en) * | 2013-08-05 | 2013-11-27 | 西南石油大学 | Method for acquiring three-dimensional permeability fields of netted fracture-cave oil reservoirs |
| CN104502252A (en) * | 2015-01-04 | 2015-04-08 | 西南石油大学 | Method for testing anisotropic permeability tension |
| CN104948176A (en) * | 2015-05-08 | 2015-09-30 | 西南石油大学 | Method for identifying carbonate reservoir fractures based on permeability increasing rate |
| CN110566195A (en) * | 2019-07-30 | 2019-12-13 | 中国海洋石油集团有限公司 | Experimental method for evaluating gas reservoir stress sensitivity under stratum condition by considering bound water |
| CN112360430A (en) * | 2020-11-04 | 2021-02-12 | 中国石油大学(北京) | Experimental device for crack leaking stoppage simulation evaluation |
| CN112392476A (en) * | 2020-12-02 | 2021-02-23 | 西南石油大学 | Method for determining hole permeability parameters of low-permeability fracture by using conventional logging data |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149339A (en) * | 2013-01-29 | 2013-06-12 | 中国科学院力学研究所 | Single fracture unsaturated seepage test system |
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| CN103410502A (en) * | 2013-08-05 | 2013-11-27 | 西南石油大学 | Method for acquiring three-dimensional permeability fields of netted fracture-cave oil reservoirs |
| CN103410502B (en) * | 2013-08-05 | 2016-03-16 | 西南石油大学 | A kind of acquisition methods of three-dimensional permeability fields of network-like fracture-pore reservoir |
| CN104502252A (en) * | 2015-01-04 | 2015-04-08 | 西南石油大学 | Method for testing anisotropic permeability tension |
| CN104948176A (en) * | 2015-05-08 | 2015-09-30 | 西南石油大学 | Method for identifying carbonate reservoir fractures based on permeability increasing rate |
| CN104948176B (en) * | 2015-05-08 | 2017-10-24 | 西南石油大学 | A kind of method based on infiltration Magnification identification carbonate reservoir crack |
| CN110566195A (en) * | 2019-07-30 | 2019-12-13 | 中国海洋石油集团有限公司 | Experimental method for evaluating gas reservoir stress sensitivity under stratum condition by considering bound water |
| CN110566195B (en) * | 2019-07-30 | 2022-11-22 | 中国海洋石油集团有限公司 | Experimental method for evaluating gas reservoir stress sensitivity under stratum condition by considering bound water |
| CN112360430A (en) * | 2020-11-04 | 2021-02-12 | 中国石油大学(北京) | Experimental device for crack leaking stoppage simulation evaluation |
| CN112392476A (en) * | 2020-12-02 | 2021-02-23 | 西南石油大学 | Method for determining hole permeability parameters of low-permeability fracture by using conventional logging data |
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|---|---|
| CN102619502B (en) | 2014-05-14 |
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