CN102619502B - 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 PDF

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CN102619502B
CN102619502B CN201210075325.7A CN201210075325A CN102619502B CN 102619502 B CN102619502 B CN 102619502B CN 201210075325 A CN201210075325 A CN 201210075325A CN 102619502 B CN102619502 B CN 102619502B
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permeability
rock
crack
water
rock core
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CN102619502A (en
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郭平
杜建芬
汪周华
张伟
罗玉琼
易敏
王娟
欧志鹏
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Southwest Petroleum University
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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

Crack--pore type Seepage Experiment model fracture permeabgility is determined method
Technical field
The fracture parameters the present invention relates in Fracture-Pore in petroleum natural gas exploration field (hole) molding sand rock or Carbonate Reservoir construction experimental model process is determined method.
Background technology
Seepage Experiment is the important foundation experiment in oil-gas field development, the seepage flow method of testing of standard only relates to uniform sandstone reservoir, do not consider carbonate or sandstone reservoir with crack, when this class band fracture reservoir boring sample, cannot get the rock core with crack, therefore there is no representativeness, how making this type of reservoir core is also the representational key of restriction test result, sets up Fracture-Pore (hole) type reservoir core fracture parameters and determines that method provides more reliable physical model to this type of Reservoir Seepage experiment.
Summary of the invention
The object of the invention is to set up a set of crack--pore type Seepage Experiment model fracture permeabgility is determined method.
For reaching above technical purpose, the invention provides following technical scheme.
Crack--pore type Seepage Experiment model fracture permeabgility is determined method, comprises the following steps successively:
(1) rock core is chosen, hole oozes test: because crack-hole (hole) type reservoir has crack, cannot get representational rock core and core, therefore first select the free from flaw reservoir core (1-1.5 inch diameter) of representative reservoir, survey core porosity (φ with gas 0) and permeability (K 0), parameter phi is oozed in the hole using this as basement rock 0, K 0.
(2) fluid formulation: provide stratum water sample analysis data preparation formation water according to scene.Simultaneously according to stratum viscosity ratio of oil and water preparation simulated oil.
(3) under formation temperature, rock core is cleaned to the rear saturated formation water of finding time, gas drive water (or simulated oil expelling water) on this basis, until not water outlet, water saturation is now basement rock irreducible water saturation S w0.Because crack Zhong Shui very easily flows, there is not irreducible water, therefore basement rock irreducible water saturation S w0the corresponding water yield is just the bound water in reservoir.
(4) reservoir well testing effective permeability is defined as to the phase permeability K with fracture reservoir x(representative considers that irreducible water affects the single-phase fracture reservoir permeability in situation).
(5) the representative free from flaw rock core of choosing is made to seam, form the rock core of different fracture permeabgilitys (permeability range of choice should be to consider to cover after compressive stress impact), in the case of the confined pressure and interior pressure reduction preparing to test, test total porosity φ and the permeability K of different fracture permeabgility rock cores, matrix stress sensitivity affects not quite in fracture-type reservoir, can not consider, therefore fracture porosity is: φ f=φ-φ 0.
(6) the water saturation S definite according to basement rock w0release the water saturation S in total fracture pore medium wi=φ 0× S w0/ φ, is the irreducible water saturation S of pore pattern carbonate rock reservoir reservoir wi.
(7) rock core after making seam is set up to quantitative irreducible water S wiafter carry out phase permeability test, see which kind of makes phase permeability and the well testing phase permeability K of rock core after seam xapproach, i.e. the corresponding absolute permeability K that makes the rear rock core of seam fbe exactly the comprehensive fracture permeabgility of needed crack basement rock, if K xmake between two the absolute permeability K that stitches rear rock core fi～K fi+1between, the crack basement rock composite permeability K that adopts interpolation processing to find to make after seam, general K 0/ K is less, can regard fracture permeabgility as K; If consider temperature impact, at high temperature test by same steps.
Compared with prior art, the present invention has following effect:
The present invention has set up how to confirm Reservoir Fracture and has made the method for stitching composite permeability, and principle is reliable.
The specific embodiment:
Further illustrate the present invention according to example below.
Crack--pore type Seepage Experiment model fracture permeabgility is determined method, comprises the following steps successively:
(1) select the free from flaw reservoir core gas gaging hole (φ of representative reservoir 0=0.224%) ooze (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) determine the phase permeability K with fracture reservoir according to reservoir well testing permeability x=14.7 × 10 -3μ m 2;
(5) the free from flaw rock core of choosing is made to seam, in the case of the confined pressure 35MPa and interior pressure reduction 2.5MPa that prepare to test, total porosity φ=2.4% and permeability K=191.6 × 10 of the rear rock core of seam are made in test -3μ m 2, obtain fracture porosity φ f=2.176%;
(6) the irreducible water saturation S of calculating pore pattern carbonate rock reservoir reservoir wi=4.24%;
(7) will make the rear rock core of seam and set up irreducible water S wiafter carry out phase permeability test, obtaining making the phase permeability of rock core after seam is 14.5 × 10 -3μ m 2with well testing phase permeability K xapproach, correspondingly make the absolute permeability K after seam f=K=191.6 × 10 -3μ m 2190 × 10 -3μ m 2left and right is exactly required fracture permeabgility.

Claims (1)

1. crack--pore type Seepage Experiment model fracture permeabgility is determined method, comprises the following steps successively:
(1) select the free from flaw reservoir core of representative reservoir, its diameter is 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) provide stratum water sample analysis data preparation formation water according to scene, simultaneously according to stratum viscosity ratio of oil and water preparation simulated oil;
(3) under formation temperature, rock core is cleaned find time after saturated formation water, gas drive water or simulated oil expelling water, until not water outlet, obtain the irreducible water saturation S of basement rock w0;
(4) reservoir well testing effective permeability is defined as to the phase permeability K with fracture reservoir x;
(5) rock core is made to 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 pore pattern carbonate rock reservoir reservoir wi=φ 0× S w0/ φ;
(7) rock core after making seam is set up to quantitative irreducible water S wiafter carry out phase permeability test, see which kind of makes phase permeability and the well testing phase permeability K of rock core after seam xapproach, i.e. the corresponding absolute permeability K that makes the rear rock core of seam fbe exactly needed crack basement rock composite permeability, if K xmake between two the absolute permeability K that stitches rear rock core fi～K fi+1between, the crack basement rock composite permeability K that adopts interpolation processing to find to make after seam.
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CN103149339B (en) * 2013-01-29 2015-06-24 中国科学院力学研究所 Single fracture unsaturated seepage test system
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
CN104502252B (en) * 2015-01-04 2017-02-22 西南石油大学 Method for testing anisotropic permeability tension
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
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
CN112360430B (en) * 2020-11-04 2023-05-12 中国石油大学(北京) Experimental device for crack plugging simulation evaluation
CN112392476B (en) * 2020-12-02 2022-02-15 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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US5621169A (en) * 1994-01-18 1997-04-15 Restech, Inc. Method for determining hydrocarbon/water contact level for oil and gas wells
RU2320869C1 (en) * 2006-06-05 2008-03-27 Общество с Ограниченной Ответственностью "ТНГ-Групп" Method to determine permeability and porosity of oil-saturated reservoirs
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