CN104453882B - Method and device for determining movable crude oil reserve of tight reservoir - Google Patents
Method and device for determining movable crude oil reserve of tight reservoir Download PDFInfo
- Publication number
- CN104453882B CN104453882B CN201410751567.2A CN201410751567A CN104453882B CN 104453882 B CN104453882 B CN 104453882B CN 201410751567 A CN201410751567 A CN 201410751567A CN 104453882 B CN104453882 B CN 104453882B
- Authority
- CN
- China
- Prior art keywords
- crude oil
- movable
- permeability
- determining
- effective
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000010779 crude oil Substances 0.000 title claims abstract description 189
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000035699 permeability Effects 0.000 claims abstract description 94
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 239000003921 oil Substances 0.000 claims description 30
- 230000015572 biosynthetic process Effects 0.000 claims description 14
- 238000002474 experimental method Methods 0.000 claims description 11
- 238000003475 lamination Methods 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 6
- 239000003129 oil well Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 230000010354 integration Effects 0.000 claims description 3
- 238000011160 research Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 8
- 230000006870 function Effects 0.000 description 7
- 238000011161 development Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The embodiment of the application discloses a method and a device for determining movable reserves of crude oil in a tight reservoir, wherein the method comprises the following steps: obtaining a first parameter of a core plunger sample of a target interval, and calculating the effective porosity, overburden permeability and starting pressure gradient of the target interval according to the first parameter; acquiring a second parameter of the crude oil of the target stratum, and determining the maximum movable radius of the crude oil according to the overburden permeability of the target stratum, the starting pressure gradient and the second parameter; determining an effective throat radius lower limit value required by crude oil flowing according to the overpressure permeability, and determining an effective movable space proportion value based on the effective throat radius lower limit value; and determining the movable reserves of the crude oil of the target layer according to the effective porosity of the target layer, the second parameter, the maximum movable radius of the crude oil and the movable space proportion value. The method and the device for determining the movable reserves of the crude oil in the tight reservoir disclosed by the embodiment of the application can realize accurate calculation of the recoverable reserves of the crude oil in the tight reservoir of the target layer in the research area.
Description
Technical Field
The application relates to the technical field of oil exploration and development, in particular to a method and a device for determining movable reserves of crude oil in a tight reservoir.
Background
With the development of oil and gas exploration and development from conventional oil and gas reservoirs to unconventional oil and gas, oil and gas in compact reservoirs gradually become important fields of oil and gas exploration and development, and particularly compact oil and shale oil gradually become new bright spots of oil and gas exploration and development. There are many key problems to be solved in tight reservoir oil exploration and development, and how to accurately determine the movable reserves of tight reservoir crude oil is one of the most key problems.
The existing method for determining the movable reserves of the crude oil in the tight reservoir generally comprises the steps of calculating the starting pressure or the starting pressure gradient of the crude oil by using the experimental analysis data of the rock core, applying the experimental data obtained by the ground conditions of a laboratory to the presumed formation conditions, and determining the movable reserves of the crude oil in the tight reservoir according to the presumed formation conditions and the starting pressure gradient obtained by calculating the experimental analysis data.
In the process of implementing the present application, the inventor finds that at least the following problems exist in the prior art: the permeability of the surface condition of the tight reservoir and the permeability of the formation condition are greatly different, and the formation condition obtained by inferring the surface condition may have a large error, so that the movable reserve of the crude oil of the tight reservoir determined according to the formation condition may have a large error.
Disclosure of Invention
The embodiment of the application aims to provide a method and a device for determining the movable reserves of crude oil in a tight reservoir, so as to improve the accuracy of the determined movable reserves of crude oil in the tight reservoir.
In order to solve the technical problem, the embodiments of the present application provide a method and an apparatus for determining a movable reserve of crude oil in a tight reservoir, which are implemented as follows:
a method of determining a mobile reserve of tight reservoir crude oil, comprising:
obtaining a first parameter of a core plunger sample of a target interval, and calculating the effective porosity, overburden permeability and starting pressure gradient of the target interval according to the first parameter;
acquiring a second parameter of the crude oil of the target stratum, and determining the maximum movable radius of the crude oil according to the overburden permeability of the target stratum, the starting pressure gradient and the second parameter;
determining an effective throat radius lower limit value required by crude oil flowing according to the overpressure permeability, and determining an effective movable space proportion value based on the effective throat radius lower limit value;
and determining the movable reserves of the crude oil of the target layer according to the effective porosity of the target layer, the second parameter, the maximum movable radius of the crude oil and the movable space proportion value.
In a preferred embodiment, the first parameter includes: effective porosity and permeability under normal pressure conditions.
Preferably, the effective porosity of the target layer is equal to the average value of the effective porosity of the sample under the pressure condition of the target layer.
In a preferred scheme, the overburden permeability of the target layer is equal to the average value of the overburden permeability of the sample under the condition of the pressure of the target layer; or the overburden permeability of the target layer is calculated according to the following formula:
kcovering and pressing＝(0.007945lnkAtmospheric pressure-0.042409)ln(PFormation of earth-PExperiment of)+0.9883PExperiment of-0.06812
In the formula, kCovering and pressingOverburden permeability for formation conditions; k is a radical ofAtmospheric pressurePermeability measurements under atmospheric conditions; pFormation of earthFormation pressure for the formation of the target zone; pExperiment ofThe pressure was measured for the laboratory.
In a preferred embodiment, the starting pressure gradient is calculated by the following formula:
in the formula, Gp is a starting pressure gradient; k is the lamination permeability of the target layer.
In a preferred embodiment, the second parameter includes: the viscosity of crude oil of a target layer, the relative permeability of the crude oil, the volume coefficient of the crude oil, the pressure of the target layer, the flowing pressure at the bottom of a well, the radius of a well shaft of the oil well and the effective thickness of an oil layer.
In a preferred scheme, the maximum movable radius of the crude oil is obtained according to a constraint condition of the minimum differential pressure of the movable crude oil of the target stratum, wherein the constraint condition is expressed as that:
in the formula, reThe maximum movable radius of the crude oil; k is the lamination permeability of the target layer; k is a radical ofroRelative permeability of crude oil; h is the effective thickness of the oil layer; pe、PwfRespectively obtaining the pressure of a target layer and the flow pressure at the bottom of a well; gp is the starting pressure gradient; mu.soCrude oil viscosity for the zone of interest; b isoIs the volume coefficient of crude oil; r iswIs the well bore radius.
In a preferred embodiment, the determining the lower limit of the effective throat radius required for the flow of the crude oil according to the overpressure permeability is implemented by calculating according to the following formula:
R95＝1.9111k0.6372
in the formula, R95Representing the lower limit value of the effective throat radius; k is the lamination permeability of the target layer.
In a preferred embodiment, the determination of the movable reserves of the crude oil of the target stratum is realized by calculating according to the following formula:
in the formula, NomTo the order ofThe mobile reserves of crude oil of the layer(s); h is the effective thickness of the oil layer; phi is the effective porosity; b isoIs the volume coefficient of crude oil; r is an integration factor, representing the radius; r ismaxMaximum radius of crude oil movement; somThe integral factor represents the movable oil saturation, namely a movable space proportion value, and the value range is 0-1; som_maxThe maximum value of the movable oil saturation, namely the maximum value of the movable space proportion value, is 0-1; som_minThe minimum value of movable oil saturation, namely the minimum value of movable space proportion value, and the value range is 0-1.
An apparatus for determining mobile reserves of tight reservoir crude oil, comprising: the device comprises a first calculating unit, a movable radius unit, a movable space proportion value unit and a movable storage unit; wherein,
the first calculation unit is used for acquiring first parameters of a core plunger sample of a target interval, and calculating the effective porosity, the overburden permeability and the starting pressure gradient of the target interval according to the first parameters;
the movable radius unit is used for acquiring a second parameter of the crude oil of the target stratum and determining the maximum movable radius of the crude oil according to the overburden permeability of the target stratum, the starting pressure gradient and the second parameter;
the movable space proportion value unit is used for determining an effective throat radius lower limit value required by the flow of crude oil according to the overpressure permeability, and determining an effective movable space proportion value based on the effective throat radius lower limit value;
and the movable reserve unit is used for determining the movable reserve of the crude oil of the target stratum according to the effective porosity of the target stratum, the second parameter, the maximum movable radius of the crude oil and the movable space proportion value.
According to the technical scheme provided by the embodiment of the application, the method and the device for determining the movable reserves of the crude oil in the tight reservoir disclosed by the embodiment of the application can be used for determining the movable reserves of the well-controlled crude oil by obtaining parameters such as the overburden pressure permeability and the starting pressure of a target layer and utilizing the relation between the starting pressure, the permeability, the minimum movable throat radius of the crude oil, the corresponding effective space proportion values of different throats and the movable reserves of the crude oil, so that the more accurate calculation of the recoverable reserves of the crude oil in the tight reservoir of the target layer in a research area can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a flow chart of one embodiment of a method of determining tight reservoir crude oil mobile reserves according to the present application;
FIG. 2 is a schematic representation of the relationship of overburden permeability to onset pressure gradient in an embodiment of the method of the present application;
FIG. 3 is a schematic representation of the relationship between the location of the crude oil from the wellbore and the maximum movable radius of the crude oil according to the present application;
FIG. 4 is a graphical representation of the relationship of overburden permeability to effective throat radius lower limit for the present application;
FIG. 5 is a schematic diagram of the relationship between the position of crude oil from a shaft and the lower limit value of the effective throat radius and the proportional value of the effective movable space;
FIG. 6 is a schematic representation of a mobile reservoir of crude oil as a function of the location of the crude oil from the wellbore according to the present application;
FIG. 7 is a block diagram of one embodiment of an apparatus for determining tight reservoir crude oil mobile reserves according to the present application.
Detailed Description
The embodiment of the application provides a method and a device for determining movable reserves of crude oil in a tight reservoir.
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An example of a method for determining mobile reserves of tight reservoir crude oil according to the present application is described below.
FIG. 1 is a flow chart of one embodiment of the present application of a method for determining tight reservoir crude oil mobile reserves, which may include, as shown in FIG. 1:
s101: and acquiring a first parameter of a core plunger sample of the target interval, and calculating the effective porosity, the overburden permeability and the starting pressure gradient of the target interval according to the first parameter.
And acquiring a first parameter of a core plunger sample of the target interval, wherein the first parameter can be obtained through experimental measurement.
The first parameter may include: effective porosity, permeability under normal pressure conditions, formation pressure for field testing, and the like.
From the first parameters, the effective porosity, overburden permeability, and initiation pressure gradient of the formation of interest can be calculated.
The effective porosity of the target layer may be equal to the average of the effective porosity of the sample at the pressure condition of the target layer.
The overburden permeability of the target layer can be equal to the average of the overburden permeability of the sample under the pressure condition of the target layer. The overburden permeability of the target layer can be calculated according to the following formula:
kcovering and pressing＝(0.007945lnkAtmospheric pressure-0.042409)ln(PFormation of earth-PExperiment of)+0.9883PExperiment of-0.06812 (1)
In the formula (1), kCovering and pressingOverburden permeability for formation conditions in units of (10)-3Square micron, can be written as 10-3μm2)；kAtmospheric pressureIs a permeability measurement under atmospheric conditions in units of (10)-3Square microns); pFormation of earthThe stratum pressure of a target layer is in megapascals and MPa; pExperiment ofThe pressure is measured in mpa for the laboratory.
The start-up pressure gradient may be calculated by the following equation:
in the formula (2), Gp is a starting pressure gradient, and the unit is (megapascal/meter, which can be written as MPa/m); k is the lamination permeability of the target layer and has the unit of (10)-3Square micron).
When the number of the samples is multiple, the starting pressure gradient of the target layer may be a median value of the starting pressure gradients corresponding to the samples.
In the step, conditions such as the actual pressure of the target layer and the like are considered in the process of calculating the starting pressure gradient and the overburden permeability, so that the accuracy of the calculated data can be ensured.
S102: and obtaining a second parameter of the crude oil of the target stratum, and determining the maximum movable radius of the crude oil according to the overburden permeability of the target stratum, the starting pressure gradient and the second parameter.
A second parameter of the destination layer may be obtained. The second parameter may be used to represent a geological parameter of the layer of interest. The second parameter may include crude oil viscosity, crude oil relative permeability, crude oil volume factor, target zone pressure, bottom hole flow pressure, well bore radius, effective reservoir thickness of the zone of interest. The second parameter may be obtained by acquisition.
And determining the maximum movable radius of the crude oil according to the overburden permeability, the starting pressure gradient and the second parameter of the target layer. The maximum movable radius of the crude oil can be obtained according to the constraint condition of the minimum differential pressure of the crude oil movable in the target stratum, and the constraint condition can be expressed as the following formula:
in the formula (3), reThe maximum movable radius of the crude oil and the unknown quantity to be solved are calculated in the unit of (meter); k is the lamination permeability of the target layer and has the unit of (10)-3Square microns); k is a radical ofroThe relative permeability of crude oil is dimensionless; h is the effective thickness of the oil layer, and the unit is (meter) and m; pe、PwfRespectively the pressure of a target layer and the bottom hole flowing pressure, and the unit is (MPa); gp is the starting pressure gradient in units of (mpa/m); mu.soThe crude oil viscosity of the target layer is expressed in units of (MPa · s, which can be written as MPa · s); b isoIs the volume coefficient of crude oil, and has the unit of (cubic meter/cubic meter, which can be written as m3/m3)；rwIs the radius of the well bore in meters.
For a compact reservoir, the permeability obtained under normal pressure conditions is about 10 times of the overburden permeability generally, the starting pressure gradient is increased along with the reduction of the permeability, and in the step, the maximum movable radius of the crude oil is calculated and obtained more reasonably under the conditions of considering the overburden permeability, the starting pressure gradient and the like under the formation conditions.
S103: and determining an effective throat radius lower limit value required by the flow of the crude oil according to the overpressure permeability, and determining an effective movable space proportion value based on the effective throat radius lower limit value.
In a target layer, because the positions of the crude oil from the shaft are different, the pressure difference of the crude oil is different, correspondingly, the minimum permeability required by the crude oil flowing under different pressure differences is also different, and the lower limit values of the movable effective throat radii of the corresponding crude oil are different.
According to the overburden permeability, the effective throat radius lower limit values at different positions can be calculated through the following formula:
R95＝1.9111k0.6372(4)
in the formula (4), R95Represents the lower limit of the effective throat radius in (microns); k is the lamination permeability of the target layer and has the unit of (10)-3Square micron).
Based on the effective throat radius lower limit value, an effective movable spatial scale value may be determined. The effective mobile space proportion value may be used to represent the proportion of the volume of crude oil mobile space in the rock that occupies the total volume of the rock. Since the tight oil generally does not contain mobile water, the effective mobile spatial scale value may be equal to the mobile crude oil saturation value. The value of mobile crude oil saturation may be obtained by slow displacement experiments.
In the step, a calculation formula of the relation between the overburden permeability and the minimum flowing throat radius is established for the compact reservoir, the pressure difference at different positions from the well is different, the permeability required by the movement of the corresponding crude oil is different, the lower limit values of the effective throat radii at different positions from the well are calculated according to the established calculation formula of the relation between the overburden permeability and the minimum flowing throat radius, the lower limit values of the effective throat radii at different positions from the well are different, the lower limit values of the effective throat radii at different positions from the well are more consistent with the actual condition of the stratum, and the obtained result is more accurate.
S104: and determining the movable reserves of the crude oil of the target layer according to the effective porosity of the target layer, the second parameter, the maximum movable radius of the crude oil and the movable space proportion value.
And determining the movable reserves of the crude oil of the target stratum according to the effective porosity of the target stratum, the second parameter, the maximum movable radius of the crude oil and the movable space proportion value. Specifically, the calculation can be obtained by the following formula:
in the formula (5), NomThe mobile reserves of crude oil for the said zone of interest, the unknowns to be solved for, are in units of (10)4Cubic meters); h is the effective thickness of the oil layer, and the unit is (meter); phi is effective porosity and the value range is 0-1; b isoIs the volume coefficient of crude oil, and the unit is (cubic meter/cubic meter); r is an integration factor, representing the radius, in (meters); r ismaxThe maximum radius of crude oil movement, in meters; somThe integral factor represents the movable oil saturation, and the value range is 0-1; som_maxThe maximum value of the movable oil saturation is 0-1; som_minThe minimum value of the movable oil saturation is 0-1.
In the step, the movable crude oil reserve is calculated according to the movable space proportion value obtained in the step, so that the obtained movable reserve result can be ensured to be more accurate.
The method for determining the movable reserves of crude oil in tight reservoirs according to the application is described in the following by combining the figure 1 and the Ordos basin extended group 7 tight reservoirs.
And obtaining 3 core plunger samples of a compact reservoir with the extension group length of 7E of the E-Topsh basin, and respectively measuring the overburden permeability, the effective porosity and the like of the 3 samples under the condition of layer pressure.
The lamination permeability under the lamination pressure condition of 3 samples is respectively 0.689 × 10-3μm2、0.712×10-3μm2、0.833×10-3μm2. The effective porosity under the condition of the layer pressure for 3 samples is respectively: 9.86%, 10.61% and 11.32%.
The effective porosity of the target layer can be equal to the average value of the effective porosity of the sample under the pressure condition of the target layer, namely 10.59 percent.
The overburden permeability of the target layer can be equal to the average value of the overburden permeability of the sample under the pressure condition of the target layer, namely 0.745 × 10-3μm2。
The overburden permeability of the target layer can be calculated according to the formula (1).
The onset pressure gradient of the sample can also be calculated from the overburden permeability of the sample. The start-up pressure gradient can be calculated by equation (2).
FIG. 2 is a schematic representation of the relationship between overburden permeability and onset pressure gradient in an embodiment of the subject application method. In fig. 2, the abscissa represents the overburden permeability and the ordinate represents the startup pressure gradient. The starting pressure gradients for the three samples can be: 0.1223MPa/m, 0.1152MPa/m, 0.0856 MPa/m. The median value of 0.1152MPa/m can be selected as the starting pressure gradient of the target layer.
A second parameter of the destination layer may be obtained. The second parameter may include crude oil viscosity, crude oil relative permeability, crude oil volume factor, target zone pressure, bottom hole flow pressure, well bore radius, effective reservoir thickness of the zone of interest. The second parameter may be obtained by acquisition.
Collecting the crude oil of a target layer of a long 7-oil-layer group where the well is located, wherein the viscosity of the crude oil is 2.21MPa & s; volume coefficient of crude oil 1.24m3/m3(ii) a The relative oil phase permeability of three core plunger samples in the original formation condition irreducible water saturation state is respectively 0.239, 0.301 and 0.311, and the average value is 0.284; the layer-to-layer pressure of the target layer is 18.92 MPa; when an oil well is produced, the bottom hole flowing pressure is generally more than 0MPa, so the bottom hole flowing pressure is respectively 0MPa and 8 MPa; the radius of the oil well shaft is 0.25 m; the production interval has a thickness of 18 m.
And determining the maximum movable radius of the crude oil according to the overburden permeability, the starting pressure gradient and the second parameter of the target layer. The maximum movable radius of the crude oil can be obtained according to the constraint condition of the minimum differential pressure of the crude oil movable in the target stratum, namely the formula (3).
When the bottom hole flowing pressure is 0MPa, the average value of the maximum movable radius of the crude oil of the target layer of the well is 178.7 m. When the bottom hole flowing pressure is 8MPa, the calculated maximum movable radius of the crude oil is 103.1 m.
In a target layer, because the positions of the crude oil from the shaft are different, the pressure difference of the crude oil is different, correspondingly, the minimum permeability required by the crude oil flowing under different pressure differences is also different, and the lower limit values of the movable effective throat radii of the corresponding crude oil are different.
FIG. 3 is a schematic representation of the relationship between the location of the crude oil from the wellbore and the maximum movable radius of the crude oil according to the present application. In fig. 3, the abscissa represents the distance of the crude oil from the wellbore, and the ordinate represents the pressure difference of the crude oil and the minimum permeability required for the crude oil to flow at different pressure differences, respectively. In FIG. 3, the solid circles indicate the pressure difference of the crude oil at a bottom hole flowing pressure of 0 MPa; the hollow round point represents the minimum permeability required for the flow of crude oil when the bottom hole flowing pressure is 0 MPa; the solid triangle represents the pressure difference of crude oil when the bottom hole flowing pressure is 8 MPa; the open triangles represent the minimum permeability required for crude oil to flow at a bottom hole flow pressure of 8 MPa.
According to the overburden permeability, the effective throat radius lower limit values at different positions can be calculated through a formula (4).
FIG. 4 is a graphical representation of the relationship of overburden permeability to effective throat radius lower limit for the present application. In the figure, the abscissa represents the overburden permeability; the ordinate represents the effective throat radius lower limit.
Based on the effective throat radius lower limit value, an effective movable spatial scale value may be determined.
Since the tight oil generally does not contain mobile water, the effective mobile spatial scale value may be equal to the mobile crude oil saturation value. The value of mobile crude oil saturation may be obtained by slow displacement experiments.
FIG. 5 is a schematic diagram of the relationship between the position of crude oil from a wellbore, the lower limit value of the effective throat radius and the effective movable space proportion value. In fig. 5, the abscissa represents the distance of the crude oil from the wellbore, and the ordinate represents the lower limit value of the effective throat radius and the effective movable space ratio value, respectively. In FIG. 4, the open circles indicate the lower limit of the effective throat radius of the crude oil when the bottom hole flowing pressure is 0 MPa; the solid round points represent the effective movable space proportion value of the crude oil when the bottom hole flowing pressure is 0 MPa; the hollow triangle represents the lower limit value of the effective throat radius of the crude oil when the bottom hole flowing pressure is 8 MPa; the solid triangle represents the effective movable space proportion value of the crude oil when the bottom hole flowing pressure is 8 MPa. When the bottom hole flowing pressure is 0MPa, the maximum movable space proportion of the crude oil is 0.52498; when the bottom hole flowing pressure is 8MPa, the maximum movable space proportion of the crude oil is 0.44853; the minimum movable space proportion of crude oil is 0.16064.
And (3) determining the movable reserves of the crude oil of the target layer according to the effective porosity of the target layer, the second parameter, the maximum movable radius of the crude oil and the movable space proportion value by the formula (5). FIG. 6 is a schematic representation of the mobile reserves of crude oil as a function of the location of the crude oil from the wellbore according to the present application. In fig. 6, the abscissa represents the distance of crude oil from the wellbore, and the ordinate represents the mobile reserves of crude oil; the solid circles in the figure represent the relationship that the movable reserves of the crude oil change with the position of the crude oil from the shaft when the bottom hole flowing pressure is 0 MPa; the solid triangle in the figure can show that when the bottom hole flowing pressure is 8MPa, the movable reserves of the crude oil change along with the position of the crude oil from the shaft.
The method for determining the movable crude oil reserve of the tight reservoir can determine the effective movable range of crude oil of the tight reservoir with the extended group length of 7 in the Ordos basin. When the bottom hole flowing pressure is 0MPa, the mobile crude oil reserve is 3.36 ten thousand tons; when the bottom flowing pressure is 8MPa, the mobile crude oil reserve is 1.03 ten thousand tons.
According to the method for determining the movable reserves of the crude oil in the tight reservoir disclosed by the embodiment, the movable reserves of the well-controlled crude oil are determined by obtaining parameters such as the overburden permeability and the starting pressure of the target layer and utilizing the relation between the starting pressure, the permeability, the minimum movable throat radius of the crude oil, the corresponding effective space proportion values of different throats and the movable reserves of the crude oil, so that the more accurate calculation of the recoverable reserves of the crude oil in the tight reservoir of the target layer in the research area can be realized.
An example of an apparatus for determining a mobile reserve of tight reservoir crude oil according to the present application is described below.
FIG. 7 is a block diagram of one embodiment of an apparatus for determining tight reservoir crude oil mobile reserves according to the present application. As shown in fig. 7, the apparatus may include: a first calculating unit 701, a movable radius unit 702, a movable space ratio value unit 703 and a movable reserve amount unit 704. Wherein,
the first calculation unit 701 may be configured to obtain a first parameter of a core plug sample of a target interval, and calculate effective porosity, overburden permeability, and a start pressure gradient of the target interval according to the first parameter.
The movable radius unit 702 may be configured to obtain a second parameter of the crude oil in the target zone, and determine a maximum movable radius of the crude oil according to the overburden permeability, the start pressure gradient, and the second parameter of the target zone.
The movable space proportion value unit 703 may be configured to determine an effective throat radius lower limit value required for crude oil to flow according to the overpressure permeability, and determine an effective movable space proportion value based on the effective throat radius lower limit value.
The movable reserves unit 704 can be used for determining the movable reserves of the crude oil of the destination layer according to the effective porosity of the destination layer, the second parameter, the maximum movable radius of the crude oil and the movable space proportion value.
The embodiment of the device for determining the movable reserves of the crude oil in the tight reservoir corresponds to the embodiment of the method for determining the movable reserves of the crude oil in the tight reservoir, and the technical effect of the embodiment of the method can be achieved.
In the 90 s of the 20 th century, improvements in a technology could clearly distinguish between improvements in hardware (e.g., improvements in circuit structures such as diodes, transistors, switches, etc.) and improvements in software (improvements in process flow). However, as technology advances, many of today's process flow improvements have been seen as direct improvements in hardware circuit architecture. Designers almost always obtain the corresponding hardware circuit structure by programming an improved method flow into the hardware circuit. Thus, it cannot be said that an improvement in the process flow cannot be realized by hardware physical modules. For example, a Programmable Logic Device (PLD), such as a Field Programmable Gate Array (FPGA), is an integrated circuit whose Logic functions are determined by programming the Device by a user. A digital system is "integrated" on a PLD by the designer's own programming without requiring the chip manufacturer to design and fabricate a dedicated integrated circuit chip 2. Furthermore, nowadays, instead of manually making an integrated Circuit chip, such Programming is often implemented by "logic compiler" software, which is similar to a software compiler used in program development and writing, but the original code before compiling is also written by a specific Programming Language, which is called Hardware Description Language (HDL), and HDL is not only one but many, such as abel (advanced Boolean Expression Language), ahdl (alternate Language Description Language), traffic, pl (core unified Programming Language), HDCal, JHDL (Java Hardware Description Language), langue, Lola, HDL, laspam, hardsradware (Hardware Description Language), vhjhd (Hardware Description Language), and vhigh-Language, which are currently used in most popular applications. It will also be apparent to those skilled in the art that hardware circuitry that implements the logical method flows can be readily obtained by merely slightly programming the method flows into an integrated circuit using the hardware description languages described above.
The controller may be implemented in any suitable manner, for example, the controller may take the form of, for example, a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, and an embedded microcontroller, examples of which include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, the memory controller may also be implemented as part of the control logic for the memory.
Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may thus be considered a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. With this understanding in mind, the present solution, or portions thereof that contribute to the prior art, may be embodied in the form of a software product, which in a typical configuration includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory. The computer software product may include instructions for causing a computing device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in the various embodiments or portions of embodiments of the present application. The computer software product may be stored in a memory, which may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium. Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include transitory computer readable media (transient media), such as modulated data signals and carrier waves.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The application is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
While the present application has been described with examples, those of ordinary skill in the art will appreciate that there are numerous variations and permutations of the present application without departing from the spirit of the application, and it is intended that the appended claims encompass such variations and permutations without departing from the spirit of the application.
Claims (8)
1. A method of determining a mobile reserve of tight reservoir crude oil, comprising:
obtaining a first parameter of a core plunger sample of a target interval, and calculating the effective porosity, overburden permeability and starting pressure gradient of the target interval according to the first parameter;
acquiring a second parameter of the crude oil of the target stratum, and determining the maximum movable radius of the crude oil according to the overburden permeability of the target stratum, the starting pressure gradient and the second parameter;
determining an effective throat radius lower limit value required by crude oil flowing according to the overpressure permeability, and determining an effective movable space proportion value based on the effective throat radius lower limit value;
determining the movable reserve of the crude oil of the target layer according to the effective porosity of the target layer, the second parameter, the maximum movable radius of the crude oil and the movable space proportion value;
the first parameter includes: effective porosity and permeability under normal pressure conditions; the second parameter includes: the viscosity of crude oil of a target layer, the relative permeability of the crude oil, the volume coefficient of the crude oil, the pressure of the target layer, the flowing pressure at the bottom of a well, the radius of a well shaft of the oil well and the effective thickness of an oil layer.
2. The method for determining mobile reserves of tight reservoir crude oil of claim 1 wherein the effective porosity of the zone of interest is equal to the average of the effective porosities of the samples at the pressure conditions of the zone of interest.
3. The method of determining tight reservoir crude oil mobile reserves of claim 1,
the overburden permeability of the target layer is equal to the average value of the overburden permeability of the sample under the condition of the pressure of the target layer;
or,
the overburden permeability of the target layer is calculated according to the following formula:
kcovering and pressing＝(0.007945lnkAtmospheric pressure-0.042409)ln(PFormation of earth-PExperiment of)+0.9883PExperiment of-0.06812
In the formula, kCovering and pressingOverburden permeability for formation conditions; k is a radical ofAtmospheric pressurePermeability measurements under atmospheric conditions; pFormation of earthFormation pressure for the formation of the target zone; pExperiment ofThe pressure was measured for the laboratory.
4. The method of determining tight reservoir crude oil mobile reserves of claim 1 wherein the onset pressure gradient is calculated by the formula:
in the formula, Gp is a starting pressure gradient; k is the lamination permeability of the target layer.
5. The method for determining the mobile reserves of crude oil in tight reservoirs according to claim 1, wherein the maximum mobile radius of crude oil is obtained according to the constraint condition of the minimum differential pressure of the mobile crude oil of the target stratum, and the constraint condition is expressed as:
in the formula, reThe maximum movable radius of the crude oil; k is the lamination permeability of the target layer; k is a radical ofroRelative permeability of crude oil; h is the effective thickness of the oil layer; pe、PwfRespectively obtaining the pressure of a target layer and the flow pressure at the bottom of a well; gp is the starting pressure gradient; mu.soCrude oil viscosity for the zone of interest; b isoIs the volume coefficient of crude oil; r iswIs the well bore radius.
6. The method for determining the mobile tight reservoir crude oil reserve of claim 1, wherein the determination of the lower effective throat radius required for crude oil flow based on the overburden permeability is calculated by the following formula:
R95＝1.9111k0.6372
in the formula, R95Representing the lower limit value of the effective throat radius; k is the lamination permeability of the target layer.
7. The method for determining the movable reserves of crude oil in the tight reservoir as claimed in claim 1, wherein the determination of the movable reserves of crude oil in the destination layer is achieved by the following calculation:
in the formula, NomA mobile reserve of crude oil for the zone of interest; h is the effective thickness of the oil layer; phi is the effective porosity; b isoIs the volume coefficient of crude oil; r is an integration factor, representing the radius; r ismaxMaximum radius of crude oil movement; somThe integral factor represents the movable oil saturation, namely a movable space proportion value, and the value range is 0-1; som_maxThe maximum value of the movable oil saturation, namely the maximum value of the movable space proportion value, is 0-1; som_minThe minimum value of movable oil saturation, namely the minimum value of movable space proportion value, and the value rangeIs 0 to 1.
8. An apparatus for determining a mobile reserve of tight reservoir crude oil, comprising: the device comprises a first calculating unit, a movable radius unit, a movable space proportion value unit and a movable storage unit; wherein,
the first calculation unit is used for acquiring first parameters of a core plunger sample of a target interval, and calculating the effective porosity, the overburden permeability and the starting pressure gradient of the target interval according to the first parameters; the first parameter includes: effective porosity and permeability under normal pressure conditions;
the movable radius unit is used for acquiring a second parameter of the crude oil of the target stratum and determining the maximum movable radius of the crude oil according to the overburden permeability of the target stratum, the starting pressure gradient and the second parameter; the second parameter includes: crude oil viscosity, crude oil relative permeability, crude oil volume coefficient, target zone pressure, bottom hole flowing pressure, oil well shaft radius and effective oil layer thickness of a target zone;
the movable space proportion value unit is used for determining an effective throat radius lower limit value required by the flow of crude oil according to the overpressure permeability, and determining an effective movable space proportion value based on the effective throat radius lower limit value;
and the movable reserve unit is used for determining the movable reserve of the crude oil of the target stratum according to the effective porosity of the target stratum, the second parameter, the maximum movable radius of the crude oil and the movable space proportion value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410751567.2A CN104453882B (en) | 2014-12-10 | 2014-12-10 | Method and device for determining movable crude oil reserve of tight reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410751567.2A CN104453882B (en) | 2014-12-10 | 2014-12-10 | Method and device for determining movable crude oil reserve of tight reservoir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104453882A CN104453882A (en) | 2015-03-25 |
| CN104453882B true CN104453882B (en) | 2017-03-08 |
Family
ID=52900554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410751567.2A Active CN104453882B (en) | 2014-12-10 | 2014-12-10 | Method and device for determining movable crude oil reserve of tight reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104453882B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105649616B (en) * | 2015-12-29 | 2018-07-13 | 中国石油天然气股份有限公司 | Method for evaluating dynamic reserve of gas well under underground throttling condition of low-permeability gas reservoir |
| CN107290259B (en) * | 2016-03-30 | 2019-09-10 | 中国石油化工股份有限公司 | The calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs |
| CN107247816B (en) * | 2016-07-20 | 2020-09-04 | 西南石油大学 | Method for judging farthest construction radius of cold recovery chemical viscosity reduction for heavy oil reservoir |
| CN106014361B (en) * | 2016-07-20 | 2019-05-14 | 西南石油大学 | A method of determine whether to carry out nitrogen auxiliary viscosity reduction and construction radius |
| CN110029989B (en) * | 2018-01-11 | 2021-11-02 | 中国石油化工股份有限公司 | Unconventional oil and gas extraction degree calculation method and system |
| CN111520136B (en) * | 2020-06-29 | 2021-01-26 | 东北石油大学 | Method for calculating pressure behind blanking plug nozzle by considering water injection starting pressure gradient |
| CN115728202B (en) * | 2022-11-04 | 2023-06-16 | 西南石油大学 | Method for determining radius lower limit of movable throat of shale |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2211329C1 (en) * | 2002-03-18 | 2003-08-27 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method of determination of well potential production rate |
| CN1786411A (en) * | 2005-12-12 | 2006-06-14 | 大庆油田有限责任公司 | Method for optimizing area well net of enhancing lowest permeable reservoir oil extracting amount |
| CN101560879A (en) * | 2008-04-15 | 2009-10-21 | 中国石油大学(北京) | Well test analysis control method for low permeability gas reservoir and method thereof |
| CN101737029A (en) * | 2009-11-25 | 2010-06-16 | 北京科技大学 | Crude oil extraction method capable of effectively utilizing ultra-low permeability reservoir bed |
| CN102706913A (en) * | 2012-06-19 | 2012-10-03 | 中国石油天然气股份有限公司 | Method and device for measuring radius lower limit of reservoir pore throat of tight sandstone reservoir |
| CN202916219U (en) * | 2012-06-19 | 2013-05-01 | 中国石油天然气股份有限公司 | Device for measuring radius lower limit of reservoir pore throat of tight sandstone reservoir |
| CN103604916A (en) * | 2013-11-21 | 2014-02-26 | 中国石油大学(北京) | Measurement method and system for gas containing range of continuous type tight sandstone gas reservoir |
| CN103743891A (en) * | 2013-12-31 | 2014-04-23 | 中国石油天然气股份有限公司 | Method for measuring occurrence state of movable oil in micro-nano pore throat system of tight oil reservoir |
| CN103760082A (en) * | 2014-01-08 | 2014-04-30 | 中国石油天然气股份有限公司 | Shale layer system tight reservoir crude oil effective movable space determination method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7508736B2 (en) * | 2007-03-09 | 2009-03-24 | Baker Hughes Incorporated | Vector migration of 1st order free-surface related downgoing multiples from VSP data |
-
2014
- 2014-12-10 CN CN201410751567.2A patent/CN104453882B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2211329C1 (en) * | 2002-03-18 | 2003-08-27 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method of determination of well potential production rate |
| CN1786411A (en) * | 2005-12-12 | 2006-06-14 | 大庆油田有限责任公司 | Method for optimizing area well net of enhancing lowest permeable reservoir oil extracting amount |
| CN101560879A (en) * | 2008-04-15 | 2009-10-21 | 中国石油大学(北京) | Well test analysis control method for low permeability gas reservoir and method thereof |
| CN101737029A (en) * | 2009-11-25 | 2010-06-16 | 北京科技大学 | Crude oil extraction method capable of effectively utilizing ultra-low permeability reservoir bed |
| CN102706913A (en) * | 2012-06-19 | 2012-10-03 | 中国石油天然气股份有限公司 | Method and device for measuring radius lower limit of reservoir pore throat of tight sandstone reservoir |
| CN202916219U (en) * | 2012-06-19 | 2013-05-01 | 中国石油天然气股份有限公司 | Device for measuring radius lower limit of reservoir pore throat of tight sandstone reservoir |
| CN103604916A (en) * | 2013-11-21 | 2014-02-26 | 中国石油大学(北京) | Measurement method and system for gas containing range of continuous type tight sandstone gas reservoir |
| CN103743891A (en) * | 2013-12-31 | 2014-04-23 | 中国石油天然气股份有限公司 | Method for measuring occurrence state of movable oil in micro-nano pore throat system of tight oil reservoir |
| CN103760082A (en) * | 2014-01-08 | 2014-04-30 | 中国石油天然气股份有限公司 | Shale layer system tight reservoir crude oil effective movable space determination method and device |
Non-Patent Citations (3)
| Title |
|---|
| 特低渗油藏储层微观孔喉分布特征与可动油评价——以十屋油田营城组油藏为例;陈志海;《石油实验地质》;20111231;第33卷(第6期);第657-661页 * |
| 评价低渗透储层开发潜力参数研究;骆瑛 等;《油气藏评价与开发》;20120831;第2卷(第4期);第24-27页 * |
| 长庆气区低渗透非均质气藏可动储量评价技术;张明禄;《天然气工业》;20100430;第30卷(第4期);第50-53页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104453882A (en) | 2015-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104453882B (en) | Method and device for determining movable crude oil reserve of tight reservoir | |
| Giese et al. | Turbulent and laminar flow in karst conduits under unsteady flow conditions: Interpretation of pumping tests by discrete conduit‐continuum modeling | |
| US9835762B2 (en) | Petrophysical rock characterization | |
| CN107679358B (en) | Method and device for determining permeability of reservoir | |
| CN105891089B (en) | Reservoir permeability determines method and device | |
| Hussain et al. | Comparison of methods for drainage relative permeability estimation from displacement tests | |
| Van Spronsen | Three-phase relative permeability measurements using the centrifuge method | |
| Hu et al. | Energy conversion reveals regime transition of imbibition in a rough fracture | |
| Helland et al. | Footprints of spontaneous fluid redistribution on capillary pressure in porous rock | |
| Mjaavatten et al. | A model for gas coning and rate-dependent gas/oil ratio in an oil-rim reservoir | |
| CN108035709B (en) | Shale reservoir quality determination method and device | |
| CN107246900B (en) | Method and device for determining oil-water interface position | |
| Chavent et al. | Determination of Relative Permeabilities and Capillary Pressures by an Automatic Adjustment Method. | |
| CN108505991B (en) | Method and device for determining extraction degree of oil in rock core | |
| CN108227032B (en) | Determination method and device for ground stress | |
| Singh et al. | Integration of nonempirical shale permeability model in a dual-continuum reservoir simulator | |
| Liu et al. | Calculation of oil and water relative permeability for extra low permeability reservoir | |
| CN106570235B (en) | Method and device for acquiring electrical parameters of tight sandstone rock | |
| Yang et al. | Numerical simulation of the free surface and water inflow of a slope, considering the nonlinear flow properties of gravel layers: a case study | |
| CN106837318B (en) | Method and device for obtaining rock stratum thick oil content | |
| Brautaset et al. | In-situ phase pressures and fluid saturation dynamics measured in waterfloods at various wettability conditions | |
| de Leon et al. | Challenges of Determining Petrophysical Reservoir Characterizations in Complex Low Porosity Fractured Carbonates–Integrating Pore Geometry, Deterministic Petrophysical Rock Types and Saturation Height Models Yields Positive Results–PEMEX Case Study Offshore Mexico | |
| Jackson et al. | Enabling Technologies for Dynamic Reservoir Evaluation and Extended Pressure Transient Testing for the Low Carbon Transition | |
| Hazlett et al. | Transient-Inflow-Performance Modeling From Analytic Line-Source Solutions for Arbitrary-Trajectory Wells | |
| CN114382460B (en) | Logging evaluation method and device for low-permeability and tight gas reservoir water outlet result |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |