CN103558358A - Intraformational heterogeneous model interlayer crack effect detection method and system thereof - Google Patents
Intraformational heterogeneous model interlayer crack effect detection method and system thereof Download PDFInfo
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Abstract
The embodiment of the invention provides an intraformational heterogeneous model interlayer crack effect detection method and a system thereof. The method comprises the following steps: taking a plurality of monolayer rock core models M1, M2... Mn having same or similar permeation rates, and processing to prepare monolayer rock core models having same specifications; respectively measuring the permeation rates K1, K2... Kn of the plurality of monolayer rock core models M1, M2... Mn having same or similar permeation rates, and calculating the average permeation rate K of the plurality of monolayer rock core models; superposing the plurality of monolayer rock core models M1, M2... Mn having same or similar permeation rates to form a combined model, and measuring the permeation rate Kt of the combined model; and comparing Kt with K, and adding a permeation material between layers of the combined model when a difference between Kt and K is greater than a preset value in order to eliminate the crack effect. The intraformational heterogeneous model interlayer crack effect detection method and the system thereof, provided in the embodiment of the invention, realize the interlayer cross flow, eliminate the crack effect and solve a problem that the crack effect of the combined model is difficult to determine and eliminate.
Description
Technical field
The invention belongs to field of petroleum exploitation, relate in particular to detection method and the system of non-homogeneous model interlayer crack effect in a kind of layer.
Background technology
Water drive sandstone reservoirs, through waterflooding for many years, has produced three large contradictions in oil reservoir: interlayer contradiction, with longitudinally contradiction and a horizontal contradiction in layer.The result of these three large contradiction effects is that water filling current only flow along macropore or most permeable zone, and current scour less than region leave a large amount of remaining oils and cannot exploit, account for the more than 50% of geologic reserve.To solve three large contradictions with effective method, just must understand fluid in the characteristics of motion of heterogeneous reservoir, formulate rational production measure and solve this three large contradiction.
At present a lot of to the research of plane and heterogeneity, method is ripe.About the research of in-layer heterogeneity, due to its complicacy, on experimental technique, do not break through, so research is fewer.Be divided at present two kinds of methods: with synthetic core, be pressed into a multilayered model, in core holding unit, carry out displacement test, to study the displacement of reservoir oil rule of layer interior heterogeneous system.Its shortcoming is that existing measuring system has an inlet and a liquid outlet, can only measure the variation of the whole oil displacement efficiency of multilayer rock core model in the injecting process, and cannot realize stratified stoichiometric, can not observe layer cross flow phenomenon.Before experiment, can only measure factor of porosity, permeability and the oil saturation of whole model, cannot measure the parameters such as permeability to oil under the factor of porosity, permeability, irreducible water saturation, irreducible water state of each pervious course.Also the irreducible oil that cannot quantitatively know each pervious course after experiment distributes.Thereby cannot realize and close the evaluation of noting each oil reservoir oil displacement efficiency in separate zone production.Another kind method is that the model of the different permeabilities of individual layer is stacked together, the shortcoming that this method has overcome said method can realize in layer interior non-homogeneous model flood pot test process, every layer of core oil saturation DYNAMIC DISTRIBUTION of quota portray and stratified stoichiometric and Interaction between layers rule.But in this method, because each single-layer model is directly superimposed, in built-up pattern, interlayer kapillary loses continuity, can cause the effect in a similar crack, increase the percolation ability of built-up pattern, built-up pattern permeability is increased.Therefore how measuring a layer interior non-homogeneous model interlayer crack effect is technical matters urgently to be resolved hurrily.
Summary of the invention
The invention provides detection method and the system of non-homogeneous model interlayer crack effect in a kind of layer, to measure a layer interior non-homogeneous model interlayer crack effect.
In order to achieve the above object, the embodiment of the present invention provides the detection method of non-homogeneous model interlayer crack effect in a kind of layer, comprising: get individual layer rock core model M 1, M2 that a plurality of permeabilities are identical or close ... Mn, makes the individual layer rock core model of same size; Measure respectively individual layer rock core model M 1, M2 that described a plurality of permeability is identical or close ... the permeability of Mn is K1, K2 ... Kn, and the mean permeability that calculates described a plurality of individual layer rock core models is K; By described a plurality of permeabilities identical or close individual layer rock core model M 1, M2 ... Mn is superimposed as built-up pattern, and the permeability of measuring described built-up pattern is Kt; Relatively Kt and K, when the difference of described Kt and K is greater than setting value, described built-up pattern add between layers penetration material, to eliminate crack effect.
Further, in one embodiment, described in the individual layer rock core model of the same size made be rectangular parallelepiped rock core, be of a size of (7cm～9cm) * (4cm～6cm) * (1cm～2cm).
Further, in one embodiment, describedly measure respectively individual layer rock core model M 1, the M2 that described a plurality of permeability is identical or close ... the permeability of Mn is K1, K2 ... Kn, comprise: each individual layer rock core model is put into multiple-lay core gripper, add confined pressure, with air permeability instrument, measure the permeability of described each individual layer rock core model.
Further, in one embodiment, described by identical or close individual layer rock core model M 1, the M2 of described a plurality of permeabilities ... Mn is superimposed as built-up pattern, the permeability of measuring described built-up pattern is Kt, comprise: by described a plurality of permeabilities identical or close individual layer rock core model M 1, M2 ... Mn is superimposed as the interior heterogeneous body built-up pattern of layer that an interlayer is interconnected, put into multiple-lay core gripper, add confined pressure, with air permeability instrument, measure the permeability Kt of described built-up pattern.
Further, in one embodiment, the described penetration material adding between layers at described built-up pattern is the face tissue identical with described individual layer rock core model specification, and described face tissue thickness is 0.05mm-0.15mm.
In order to achieve the above object, the embodiment of the present invention also provides the detection system of non-homogeneous model interlayer crack effect in a kind of layer, comprising: source of the gas, air permeability instrument, core holding unit and confined pressure system; Wherein, described source of the gas is connected with described air permeability instrument, and the upper end import of described core holding unit is connected with downstream pressure interface with the upstream pressure interface on described air permeability instrument respectively with lower end outlet; Described confined pressure system is connected with described core holding unit; Rock core model to be measured is put into described core holding unit, measure the physical dimension of described rock core model to be measured, the flow of the pressure reduction of upper/lower terminal of described rock core model to be measured and the outlet of the lower end of described core holding unit, utilize Darcy's law, calculate the permeability of described rock core model to be measured; In detecting described layer during the effect of non-homogeneous model interlayer crack: get individual layer rock core model M 1, M2 that a plurality of permeabilities are identical or close ... Mn, makes the individual layer rock core model of same size; Each individual layer rock core model is put into described core holding unit, utilize described air permeability instrument to measure respectively described each individual layer rock core model M 1, M2 ... the permeability of Mn is K1, K2 ... Kn, and the mean permeability that calculates described a plurality of individual layer rock core models is K; By described a plurality of permeabilities identical or close individual layer rock core model M 1, M2 ... Mn is superimposed as built-up pattern, and described built-up pattern is put into described core holding unit, and the permeability of utilizing described air permeability instrument to measure described built-up pattern is Kt; Relatively Kt and K, when the difference of described Kt and K is greater than setting value, described built-up pattern add between layers penetration material, to eliminate crack effect.
Further, in one embodiment, described in the individual layer rock core model of the same size made be rectangular parallelepiped rock core, be of a size of (7cm～9cm) * (4cm～6cm) * (1cm～2cm).
Further, in one embodiment, the described penetration material adding between layers at described built-up pattern is the face tissue identical with described individual layer rock core model specification, and described face tissue thickness is 0.05mm-0.15mm.
Further, in one embodiment, described air permeability instrument comprises: differential pressure pickup and flowmeter, be respectively used to measure the pressure reduction of upper/lower terminal of described rock core model to be measured and the flow of the lower end of described core holding unit outlet.
Detection method and the system of non-homogeneous model interlayer crack effect in the layer of the embodiment of the present invention, by adding penetration material at interlayer, can realize mutual channelling between layers, can eliminate crack effect again, for laying a good foundation by heterogeneous body water drive rule and remaining oil distribution in built-up pattern research layer, solved and be difficult to judgement and eliminate a difficult problem of measuring built-up pattern crack effect.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those skilled in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the detection system of non-homogeneous model interlayer crack effect in a kind of layer of the embodiment of the present invention;
Fig. 2 is the method flow diagram of the interior non-homogeneous model interlayer of the layer crack effect detection method of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the structural representation of the detection system of non-homogeneous model interlayer crack effect in a kind of layer of the embodiment of the present invention.As shown in the figure, the detection system of the present embodiment comprises: source of the gas 1, air permeability instrument 2, core holding unit 3 and confined pressure system 4; Wherein, described source of the gas 1 is connected with described air permeability instrument 2, and the upper end import of described core holding unit 3 is connected with downstream pressure interface with the upstream pressure interface on described air permeability instrument 2 respectively with lower end outlet; Described confined pressure system 4 is connected with described core holding unit 3; Rock core model to be measured is put into described core holding unit 3, measure the physical dimension of described rock core model to be measured, the flow of the pressure reduction of the upper/lower terminal of described rock core model to be measured and the outlet of the lower end of described core holding unit 3, utilize Darcy's law, calculate the permeability of described rock core model to be measured.
Wherein, on air permeability instrument 2, comprise differential pressure pickup 21 and flowmeter 22, be respectively used to measure the pressure reduction of upper/lower terminal of described rock core model to be measured and the flow of the lower end of described core holding unit outlet.
Fig. 2 is the detection system of utilizing non-homogeneous model interlayer crack effect in the layer of said structure to the method flow diagram that in described layer, non-homogeneous model interlayer crack effect detects.As shown in the figure, the method comprises:
Step S101, gets individual layer rock core model M 1, M2 that a plurality of permeabilities are identical or close ... Mn, makes the individual layer rock core model of same size.In the present embodiment, permeability is identical or close refers to that the principal permeability of those individual layer rock core models and the gap of minimum permeability are no more than 20%.And in the present embodiment, the individual layer rock core model of the same size of making is rectangular parallelepiped rock core, is preferably of a size of (7cm～9cm) * (4cm～6cm) * (1cm～2cm), size is put into baking oven and is heated 105 ° to constant weight amount after determining.
Step S102, each individual layer rock core model is put into described core holding unit 3, utilize described air permeability instrument 2 to measure respectively described each individual layer rock core model M 1, M2 ... the permeability of Mn is K1, K2 ... Kn, and the mean permeability that calculates described a plurality of individual layer rock core models is K.In this step, first to determine rationally effectively confined pressure, guarantee that between the gum cover in model and core holding unit 3, sealing effectively, channelling does not occur.Concrete grammar is: use with the steel model (permeability equals zero) of model same size and put into core holding unit 3, air is connected in core holding unit 3 imports, add confined pressure until the endpiece of core holding unit 3 holds one's breath, confined pressure is now exactly the rationally effective confined pressure of determining.
Step S103, by described a plurality of permeabilities identical or close individual layer rock core model M 1, M2 ... Mn is superimposed as built-up pattern, described built-up pattern is put into described core holding unit 3, and the permeability of utilizing described air permeability instrument 2 to measure described built-up pattern is Kt.In the present embodiment, core holding unit 3 can be by replacing with, lower end cap and gum cover, the built-up pattern that can hold individual layer rectangle model and be superimposed.This built-up pattern is heterogeneous body built-up pattern in the layer that interlayer is interconnected one by one.And the measurement that utilizes air permeability instrument to carry out rock core model permeability has been the conventional techniques means of this area, therefore repeat no more in the present invention.
Step S104, relatively Kt and K, when the difference of described Kt and K is greater than setting value, described built-up pattern add between layers penetration material, to eliminate crack effect.In the present embodiment, if crack effect is very little or do not have, Kt approaches or equals K, if crack effect is very large, Kt is far longer than K.
In the present embodiment, at the penetration material adding between layers of described built-up pattern, be the face tissue identical with described individual layer rock core model specification, described face tissue thickness is 0.05mm-0.15mm, perviousness is relatively good.Due to face tissue very thin thickness, so vertical direction permeability is far above the permeability of model, for layer cross flow, can not produce substantial effect.In adding between layers after face tissue of built-up pattern, put it in core holding unit 3, the air permeability that records built-up pattern with described air permeability instrument 2 is Kto, if crack effect is eliminated, Kto should approach or equal K, if crack effect is not eliminated, Kto still can be far longer than K.
By above embodiment, can find out, by adding penetration material at interlayer, can realize mutual channelling between layers, can eliminate crack effect again.
The individual layer rock core model group of different permeabilities is combined, and its crack effect club is different, and the crack effect of the built-up pattern that permeability is large is large, and the crack effect of the built-up pattern that permeability is little is little.Specific embodiment below selects high, medium and low three groups of built-up patterns to carry out the detection of crack effect, and T material wherein refers to penetration material, can be face tissue, non-homogeneous model interlayer crack effect detection result in the layer that table 1 is the present embodiment.
Table 1
As can be seen from the above Table 1: the built-up pattern mean permeability of three basic, normal, high permeabilities is respectively 278mD, 1232mD, 1910mD; While not adding penetration material, the permeability of built-up pattern is respectively 455mD, 2169mD, 4429mD, exceeds 63.9%, 75.9%, 131.8% respectively than mean permeability, and the higher crack of mean permeability effect is more obvious.Add after penetration material, the permeability of built-up pattern obviously reduces, permeability relative error be all less than instrument measuring error 5%.
Detection method and the system of non-homogeneous model interlayer crack effect in the layer of the embodiment of the present invention, by adding penetration material at interlayer, can realize mutual channelling between layers, can eliminate crack effect again, for laying a good foundation by heterogeneous body water drive rule and remaining oil distribution in built-up pattern research layer, solved and be difficult to judgement and eliminate a difficult problem of measuring built-up pattern crack effect.
In the present invention, applied specific embodiment principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (9)
1. a detection method for non-homogeneous model interlayer crack effect in layer, is characterized in that, in described layer, the detection method of non-homogeneous model interlayer crack effect comprises:
Get individual layer rock core model M 1, M2 that a plurality of permeabilities are identical or close ... Mn, makes the individual layer rock core model of same size;
Measure respectively individual layer rock core model M 1, M2 that described a plurality of permeability is identical or close ... the permeability of Mn is K1, K2 ... Kn, and the mean permeability that calculates described a plurality of individual layer rock core models is K;
By described a plurality of permeabilities identical or close individual layer rock core model M 1, M2 ... Mn is superimposed as built-up pattern, and the permeability of measuring described built-up pattern is Kt;
Relatively Kt and K, when the difference of described Kt and K is greater than setting value, described built-up pattern add between layers penetration material, to eliminate crack effect.
2. the detection method of non-homogeneous model interlayer crack effect in layer according to claim 1, it is characterized in that, the individual layer rock core model of the described same size of making is rectangular parallelepiped rock core, is of a size of (7cm～9cm) * (4cm～6cm) * (1cm～2cm).
3. the detection method of non-homogeneous model interlayer crack effect in layer according to claim 1, it is characterized in that, describedly measure respectively individual layer rock core model M 1, the M2 that described a plurality of permeability is identical or close ... the permeability of Mn is K1, K2 ... Kn, comprising:
Each individual layer rock core model is put into multiple-lay core gripper, add confined pressure, with air permeability instrument, measure the permeability of described each individual layer rock core model.
4. the detection method of non-homogeneous model interlayer crack effect in layer according to claim 1, it is characterized in that, described by identical or close individual layer rock core model M 1, the M2 of described a plurality of permeabilities ... Mn is superimposed as built-up pattern, and the permeability of measuring described built-up pattern is Kt, comprising:
By described a plurality of permeabilities identical or close individual layer rock core model M 1, M2 ... Mn is superimposed as the interior heterogeneous body built-up pattern of layer that an interlayer is interconnected, put into multiple-lay core gripper, add confined pressure, with air permeability instrument, measure the permeability Kt of described built-up pattern.
5. the detection method of non-homogeneous model interlayer crack effect in layer according to claim 1, it is characterized in that, the penetration material adding between layers at described built-up pattern is the face tissue identical with described individual layer rock core model specification, and described face tissue thickness is 0.05mm-0.15mm.
6. a detection system for non-homogeneous model interlayer crack effect in layer, is characterized in that, described detection system comprises: source of the gas, air permeability instrument, core holding unit and confined pressure system; Wherein,
Described source of the gas is connected with described air permeability instrument, and the upper end import of described core holding unit is connected with downstream pressure interface with the upstream pressure interface on described air permeability instrument respectively with lower end outlet; Described confined pressure system is connected with described core holding unit;
Rock core model to be measured is put into described core holding unit, measure the physical dimension of described rock core model to be measured, the flow of the pressure reduction of upper/lower terminal of described rock core model to be measured and the outlet of the lower end of described core holding unit, utilize Darcy's law, calculate the permeability of described rock core model to be measured;
In detecting described layer during the effect of non-homogeneous model interlayer crack:
Get individual layer rock core model M 1, M2 that a plurality of permeabilities are identical or close ... Mn, makes the individual layer rock core model of same size;
Each individual layer rock core model is put into described core holding unit, utilize described air permeability instrument to measure respectively described each individual layer rock core model M 1, M2 ... the permeability of Mn is K1, K2 ... Kn, and the mean permeability that calculates described a plurality of individual layer rock core models is K;
By described a plurality of permeabilities identical or close individual layer rock core model M 1, M2 ... Mn is superimposed as built-up pattern, and described built-up pattern is put into described core holding unit, and the permeability of utilizing described air permeability instrument to measure described built-up pattern is Kt;
Relatively Kt and K, when the difference of described Kt and K is greater than setting value, described built-up pattern add between layers penetration material, to eliminate crack effect.
7. the detection system of non-homogeneous model interlayer crack effect in layer according to claim 6, it is characterized in that, the individual layer rock core model of the described same size of making is rectangular parallelepiped rock core, is of a size of (7cm～9cm) * (4cm～6cm) * (1cm～2cm).
8. the detection system of non-homogeneous model interlayer crack effect in layer according to claim 6, it is characterized in that, the described penetration material adding between layers at described built-up pattern is the face tissue identical with described individual layer rock core model specification, and described face tissue thickness is 0.05mm-0.15mm.
9. the detection system of non-homogeneous model interlayer crack effect in layer according to claim 6, is characterized in that, described air permeability instrument comprises:
Differential pressure pickup and flowmeter, be respectively used to measure the pressure reduction of upper/lower terminal of described rock core model to be measured and the flow of the lower end of described core holding unit outlet.
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