CN109060863A - A method of evaluation shale gas reservoir self-priming leading edge migration ability - Google Patents
A method of evaluation shale gas reservoir self-priming leading edge migration ability Download PDFInfo
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Abstract
A method of evaluation shale gas reservoir self-priming leading edge migration ability is specifically implemented according to the following steps: step 1, acquiring shale test sample and simultaneously pre-process to it；Step 2, the pretreated shale test sample of step 1 is placed in fluid, fluid is penetrated into since shale test sample bottom；Step 3, radial scan is carried out to shale test sample by low magnetic field intensity Nuclear Magnetic Resonance in different time points, until shale test sample is impregnated with completely by fluid, obtains resonance signal amplitude corresponding to different time points；Step 4, water saturation is converted by the resonance signal amplitude of step 3, and draws the curve graph of the forward travel distance of different time points water saturation and the infiltration of shale test sample, the i.e. test of completion shale suction capacity；The present invention uses nuclear magnetic resonance technique, obtains the curve graph of water saturation and forward travel distance of the shale test sample during self-priming in different time sections, can be used for instructing the exploitation of shale gas.
Description
Technical field
The invention belongs to oil and gas development experimental technique fields, and in particular to a kind of evaluation shale gas reservoir self-priming leading edge migration
The method of ability.
Background technique
Shale gas possesses huge reserves in the whole world, studies have shown that horizontal well as a kind of important unconventional resource
Multistage hydraulic fracturing is the most effective technology of currently available exploitation shale oil-gas reservoir.With the hydraulic fracturing of conventional oil gas reservoir
It compares, shale reservoir hydraulic fracturing has the characteristics that fracturing fluid recovery (backflow) low efficiency, so as to cause fracturing fluids a large amount of in shale reservoir
Delay.Found after the mass production data to shale reservoir is investigated, the row's of returning efficiency of fracturing fluid only 10%~
Between 40%, the fracturing fluid of delay significantly increases the water saturation of shale reservoir near crack, to will lead to gas stream
The blocking of amount and the reduction of production capacity, when water saturation is close to 40%~50%, gas well capacity will be badly damaged, by level
Fracturing fluid is detained in well hydraulic fracturing three-dimensional simulation result is it is found that low water saturation, low matrix permeability or low initially contain
Gas saturation can aggravate the fracturing fluid retention problems in crack.
Self-priming of the fracturing fluid in shale matrix is one of the most important factor for causing fracturing fluid to be detained, and self-priming process is to pressure
The delay for splitting liquid plays an important role；On the one hand, the driving force of self-priming is from capillary pressure, and surfactant can have
Effect reduces capillary force, and on the other hand, self-priming also contributes to reducing the water saturation near crack, to improve having for gas
Imitate permeability.
And the method that the research of shale spontaneous imbibition phenomena is mainly used at present be to liquid absorption time in shale samples and
Relationship between uptake is inquired into, and this method cannot effectively describe during self-priming the aqueous of rock sample in different time sections
The distribution relation of saturation degree and forward travel distance.
Summary of the invention
In order to overcome the defects of the prior art described above, the object of the present invention is to provide before a kind of evaluation shale gas reservoir self-priming
The migrate method of ability of edge obtains shale test sample during self-priming in different time sections using nuclear magnetic resonance technique
Water saturation distribution curve, whole process is easy to operate, be easy control, after obtaining the suction capacity of shale test sample,
It is used for during shale gas must develop, the development efficiency of shale gas can be improved.
In order to achieve the above object, the technical scheme adopted by the invention is that,
A method of evaluation shale gas reservoir self-priming leading edge migration ability, comprising the following steps:
Step 1, it acquires shale test sample and it is pre-processed；
Step 2, the pretreated shale test sample of the step 1 is placed on the permeable stone in container, container includes
There is deionized water, the fluid is penetrated into since shale test sample bottom；
Step 3, radial scan is carried out to shale test sample by low magnetic field intensity Nuclear Magnetic Resonance in different time points,
Until shale test sample is impregnated with completely by fluid, resonance signal amplitude corresponding to different time points is obtained；
Step 4, water saturation is converted by the resonance signal amplitude of the step 3, and it is aqueous to draw different time points
The curve graph of saturation degree and the forward travel distance of shale test sample infiltration, the i.e. test of completion shale suction capacity；
Water saturation is converted by resonance signal amplitude to calculate especially by following formula:
Wherein, x is that current point in time shale test sample is substantially impermeable to fluids a little between shale test sample upper surface
Distance；T (x) is the resonance signal amplitude at X position；SwIt (x) is the water saturation at X position；T(x)100%To be surveyed when shale
Resonance signal amplitude when test agent is fully saturated, at X position.
Step 5, analyze water saturation and forward travel distance relationship, draw shale test sample infiltration forward travel distance with
The scatter chart of water saturation.
It is pretreated in the step 1 method particularly includes: shale test sample is placed in oven to dry, the temperature of oven
It is 90-100 DEG C, until weight no longer changes, is cooled to room temperature later.
Shale test sample is cylindrical body, a height of 25-35mm, basal diameter 25mm in the step 1.
Shale test sample is carried out by low magnetic field intensity Nuclear Magnetic Resonance in different time points in the step 3 radial
Scanning method particularly includes:
Shale test sample is taken out from fluid, is started from the bottom, it is total by low magnetic field intensity nuclear-magnetism at interval of 4mm
Vibration Meter is scanned, until shale test sample upper surface, obtains being total to for four groups corresponding to four time points after the completion of scanning
Vibration signal amplitude.
Different time points are respectively as follows: 8-12h, 18-22h, 55-65h, 110-130h in the step 3.
In the step 3 when time point is 110-130h, first keep shale test sample corresponding using CENTRIFUGAL ACCELERATING instrument
Fluid it is fully saturated, then by low magnetic field intensity Nuclear Magnetic Resonance to shale test sample carry out radial scan, until nuclear-magnetism
Scanning result no longer changes, the speed of the CENTRIFUGAL ACCELERATING machine are as follows: 7500r/min.
The invention has the advantages that the present invention acquires shale test sample first and pre-processes to it；Secondly will
Pretreated shale test sample is placed in fluid, and fluid is penetrated into since shale test sample bottom；Then when different
Between point radial scan carried out to shale test sample by low magnetic field intensity Nuclear Magnetic Resonance, until shale test sample is by fluid
It is impregnated with completely, obtains resonance signal amplitude corresponding to different time points；Resonance signal amplitude is converted to finally by formula
Water saturation, the i.e. test of completion shale suction capacity, obtain the forward travel distance and water saturation of shale test sample infiltration
Scatter chart, whole process is easy to operate, be easy control, after obtaining the suction capacity of shale test sample, be used for
During shale gas must be developed, the development efficiency of shale gas can be improved.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Fig. 2 is shale test sample of the present invention in 10h, the scatter chart of forward travel distance and water saturation.
Fig. 3 is shale test sample of the present invention in 20h, the scatter chart of forward travel distance and water saturation.
Fig. 4 is shale test sample of the present invention in 60h, the scatter chart of forward travel distance and water saturation.
Fig. 5 is shale test sample of the present invention in 120h, the scatter chart of forward travel distance and water saturation.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
A kind of method of evaluation shale gas reservoir self-priming leading edge migration ability of the present invention, is specifically implemented according to the following steps,
As shown in Figure 1,
Step 1, by a height of 25-35mm, basal diameter is that the cylindrical shale test sample of 25mm is placed in 90-100 DEG C
It is dry in oven, until weight no longer changes, it is cooled to room temperature later；
Step 2, shale test sample after cooling is placed on the permeable stone in container, contains deionization in the container
Water, the fluid are penetrated into since shale test sample bottom；
Step 3, at tetra- time points of 8-12h, 18-22h, 55-65h, 110-130h respectively by shale test sample from stream
It takes out, starts from the bottom in body, be scanned at interval of 4mm by low magnetic field intensity Nuclear Magnetic Resonance, until shale is tested
Sample upper surface is to obtain 8-12h, 18-22h, 55-65h and 110-130h after the completion of scanning, corresponding to four time points
Four groups of resonance signal amplitudes, wherein when time point is 110-130h, first use speed for the CENTRIFUGAL ACCELERATING instrument of 7500r/min
Keep shale test sample fully saturated by corresponding fluid, then by low magnetic field intensity Nuclear Magnetic Resonance to shale test sample into
Row radial scan, until nuclear magnetic scanning result no longer changes.
Step 4, water saturation is converted for the resonance signal amplitude of the step 3 by following formula, and drawn not
With the curve graph of time point water saturation and the forward travel distance of shale test sample infiltration, i.e. completion shale suction capacity is surveyed
Examination, obtains the scatter chart of shale test sample forward travel distance and water saturation under different time points；
Wherein, x is that current point in time shale test sample is substantially impermeable to fluids a little between shale test sample upper surface
Distance；T (x) is the resonance signal amplitude at X position；SwIt (x) is the water saturation at X position；T(x)100%To be surveyed when shale
Resonance signal amplitude when test agent is fully saturated, at X position；
Step 5, analyze water saturation and forward travel distance relationship, draw shale test sample infiltration forward travel distance with
The scatter chart of water saturation.
The forward travel distance of above-mentioned shale test sample infiltration can embody the self-priming leading edge migration energy of shale test sample
Power.
The variation that Fig. 2-5 respectively describes shale test sample water saturation and forward travel distance under different time points is bent
Line, coordinate origin are the starting self-priming face of shale test sample, it represents the interface between crack and reservoir matrix, x-axis table
Show that the distance in starting self-priming face is arrived in imbibition face, y-axis indicates the water saturation value of each position；During entire self-priming, point
The other shale test sample to self-priming 10h, 20h, 60h, 120h carries out nuclear magnetic scanning, obtain 4 water saturation values and away from
Curve from relationship.In addition, since the experimental method of design is intended to simulate the spontaneous diffusion of aqueous fracturing fluid under the conditions of closing well,
What should be kept constant in rock sample supplies from imbibition, and therefore, the initial position of y-axis is all since 100%；
From in Fig. 2-5 as can be seen that with self-priming surface distance increase, water saturation from 100% gradually decrease for
0%, it is contemplated that the presence of the heterogeneity of shale test sample, in figs. 2-5 it can be observed that the bending of shale test sample
The fluctuation characteristic of degree and pore-size distribution and curve；The slope of curve is larger, before contemporaneity water saturation
It shortens into distance, after 10h and 120h, the corresponding forward travel distance of water saturation leading edge respectively reaches 14.5 and 23.5mm；Often
Closed area between curve and reference axis indicates each liquid absorption amount, which increases with the increase of self-priming time,
As time increases, area growth rate and water saturation are gradually reduced, and illustrate that self-priming process has slowly reached balance.
Embodiment one
The embodiment of the present invention one provides a kind of method of evaluation shale gas reservoir self-priming leading edge migration ability, specific embodiment party
Method are as follows:
First by a height of 30mm, basal diameter is placed in 95 DEG C of oven for the cylindrical shale test sample of 25mm and does
It is dry, until weight no longer changes, it is cooled to room temperature later；Secondly shale test sample after cooling is placed in container
On permeable stone, deionized water is contained in the container, the fluid is penetrated into since shale test sample bottom；Then 10h,
Tetra- time points of 20h, 60h, 120h respectively take out shale test sample from fluid, start from the bottom, logical at interval of 4mm
Low magnetic field intensity Nuclear Magnetic Resonance is crossed to be scanned, obtained until shale test sample upper surface, after the completion of scanning 10h,
20h, 60h, 120h, four groups of resonance signal amplitudes corresponding to four time points, wherein first used in 120h speed for
The CENTRIFUGAL ACCELERATING instrument of 7500r/min keeps shale test sample fully saturated by corresponding fluid, then passes through low magnetic field intensity nuclear-magnetism
The instrument that resonates carries out radial scan to shale test sample, until nuclear magnetic scanning result no longer changes.It will finally by following formula
The resonance signal amplitude of the step 3 is converted into water saturation, and draws different time points water saturation and shale test
The curve graph of the forward travel distance of sample infiltration, the i.e. test of completion shale suction capacity, obtain shale test specimens under different time points
The scatter chart of product forward travel distance and water saturation；
Wherein, x is that current point in time shale test sample is substantially impermeable to fluids a little between shale test sample upper surface
Distance；T (x) is the resonance signal amplitude at X position；SwIt (x) is the water saturation at X position；T(x)100%To be surveyed when shale
Resonance signal amplitude when test agent is fully saturated, at X position.
The relationship of ultimate analysis water saturation and forward travel distance, draw shale test sample infiltration forward travel distance with contain
The scatter chart of water saturation.
Embodiment two
The embodiment of the present invention 2 provides a kind of method of evaluation shale gas reservoir self-priming leading edge migration ability, specific embodiment party
Method are as follows:
First by a height of 25mm, basal diameter is placed in 90 DEG C of oven for the cylindrical shale test sample of 25mm and does
It is dry, until weight no longer changes, it is cooled to room temperature later；Secondly shale test sample after cooling is placed in container
On permeable stone, deionized water is contained in the container, the fluid is penetrated into since shale test sample bottom；Then 8h,
Tetra- time points of 18h, 55h, 110h respectively take out shale test sample from fluid, start from the bottom, logical at interval of 4mm
Low magnetic field intensity Nuclear Magnetic Resonance is crossed to be scanned, obtained until shale test sample upper surface, after the completion of scanning 8h, 18h,
55h, 110h, four groups of resonance signal amplitudes corresponding to four time points, wherein first use speed for 7500r/ in 110h
The CENTRIFUGAL ACCELERATING instrument of min keeps shale test sample fully saturated by corresponding fluid, then passes through low magnetic field intensity Nuclear Magnetic Resonance
Radial scan is carried out to shale test sample, until nuclear magnetic scanning result no longer changes；Finally by following formula by the step
Rapid 3 resonance signal amplitude is converted into water saturation, and draws different time points water saturation and shale test sample infiltration
The curve graph of saturating forward travel distance, the i.e. test of completion shale suction capacity obtain shale test sample under different time points and advance
The scatter chart of distance and water saturation；
Wherein, x is that current point in time shale test sample is substantially impermeable to fluids a little between shale test sample upper surface
Distance；T (x) is the resonance signal amplitude at X position；SwIt (x) is the water saturation at X position；T(x)100%To be surveyed when shale
Resonance signal amplitude when test agent is fully saturated, at X position.
The relationship of ultimate analysis water saturation and forward travel distance, draw shale test sample infiltration forward travel distance with contain
The scatter chart of water saturation.
Embodiment three
The embodiment of the present invention 3 provides a kind of method of evaluation shale gas reservoir self-priming leading edge migration ability, specific embodiment party
Method are as follows:
First by a height of 35mm, basal diameter is placed in 100 DEG C of oven for the cylindrical shale test sample of 25mm and does
It is dry, until weight no longer changes, it is cooled to room temperature later；Secondly shale test sample after cooling is placed in container
On permeable stone, deionized water is contained in the container, the fluid is penetrated into since shale test sample bottom；Then 12h,
Tetra- time points of 22h, 65h, 130h respectively take out shale test sample from fluid, start from the bottom, logical at interval of 4mm
Low magnetic field intensity Nuclear Magnetic Resonance is crossed to be scanned, obtained until shale test sample upper surface, after the completion of scanning 12h,
22h, 65h, 130h, four groups of resonance signal amplitudes corresponding to four time points, wherein first used in 130h speed for
The CENTRIFUGAL ACCELERATING instrument of 7500r/min keeps shale test sample fully saturated by corresponding fluid, then passes through low magnetic field intensity nuclear-magnetism
The instrument that resonates carries out radial scan to shale test sample, until nuclear magnetic scanning result no longer changes；It will finally by following formula
The resonance signal amplitude of the step 3 is converted into water saturation, and draws different time points water saturation and shale test
The curve graph of the forward travel distance of sample infiltration, the i.e. test of completion shale suction capacity, obtain shale test specimens under different time points
The scatter chart of product forward travel distance and water saturation；
Wherein, x is that current point in time shale test sample is substantially impermeable to fluids a little between shale test sample upper surface
Distance；T (x) is the resonance signal amplitude at X position；SwIt (x) is the water saturation at X position；T(x)100%To be surveyed when shale
Resonance signal amplitude when test agent is fully saturated, at X position.
The relationship of ultimate analysis water saturation and forward travel distance, draw shale test sample infiltration forward travel distance with contain
The scatter chart of water saturation.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (6)
1. a kind of method of evaluation shale gas reservoir self-priming leading edge migration ability, which comprises the following steps:
Step 1, it acquires shale test sample and it is pre-processed；
Step 2, the pretreated shale test sample of the step 1 is placed on the permeable stone in container, contains in container and goes
Ionized water, the fluid are penetrated into since shale test sample bottom；
Step 3, radial scan is carried out to shale test sample by low magnetic field intensity Nuclear Magnetic Resonance in different time points, until
Shale test sample is impregnated with completely by fluid, obtains resonance signal amplitude corresponding to different time points；
Step 4, water saturation is converted by the resonance signal amplitude of the step 3, and draws different time points containing water saturation
The curve graph of degree and the forward travel distance of shale test sample infiltration, the i.e. test of completion shale suction capacity；
Water saturation is converted by resonance signal amplitude, is calculated especially by following formula:
Wherein, x is that current point in time shale test sample is substantially impermeable to fluids a little and the distance between shale test sample upper surface；
T (x) is the resonance signal amplitude at X position；SwIt (x) is the water saturation at X position；T(x)100%For when shale test specimens
Resonance signal amplitude when product are fully saturated, at X position；
Step 5, analyze water saturation and forward travel distance relationship, draw shale test sample infiltration forward travel distance with it is aqueous
The scatter chart of saturation degree.
2. a kind of method of evaluation shale gas reservoir self-priming leading edge migration ability according to claim 1, which is characterized in that
It is pretreated in the step 1 method particularly includes: shale test sample to be placed in drying in oven, the temperature of oven is 90-100
DEG C, until weight no longer changes, it is cooled to room temperature later.
3. a kind of method of evaluation shale gas reservoir self-priming leading edge migration ability according to claim 1, which is characterized in that
Shale test sample is cylindrical body, a height of 25-35mm, basal diameter 25mm in the step 1.
4. a kind of method of evaluation shale gas reservoir self-priming leading edge migration ability according to claim 1, which is characterized in that
Carry out the tool of radial scan in the step 3 to shale test sample by low magnetic field intensity Nuclear Magnetic Resonance in different time points
Body method are as follows:
Shale test sample is taken out from fluid, is started from the bottom, passes through low magnetic field intensity Nuclear Magnetic Resonance at interval of 4mm
It is scanned, until shale test sample upper surface, obtains four groups of resonance letters corresponding to four time points after the completion of scanning
Number amplitude.
5. a kind of method of evaluation shale gas reservoir self-priming leading edge migration ability according to claim 1 or 4, feature exist
In different time points are respectively as follows: 8-12h, 18-22h, 55-65h, 110-130h in the step 3.
6. a kind of method of evaluation shale gas reservoir self-priming leading edge migration ability according to claim 5, which is characterized in that
In the step 3 when time point is 110-130h, first keep shale test sample complete by corresponding fluid using CENTRIFUGAL ACCELERATING instrument
Full saturation, then radial scan is carried out to shale test sample by low magnetic field intensity Nuclear Magnetic Resonance, until nuclear magnetic scanning result
No longer change, the speed of the CENTRIFUGAL ACCELERATING machine are as follows: 7500r/min.
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Application publication date: 20181221 |
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