CN110618170B - Method and device for determining saturation index of rock and soil - Google Patents
Method and device for determining saturation index of rock and soil Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 405
- 238000000034 method Methods 0.000 title claims abstract description 65
- 239000002689 soil Substances 0.000 title abstract description 305
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 172
- 238000001035 drying Methods 0.000 claims abstract description 119
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- 238000005406 washing Methods 0.000 claims abstract description 42
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- 238000001228 spectrum Methods 0.000 claims description 31
- 238000005481 NMR spectroscopy Methods 0.000 claims description 28
- 238000012545 processing Methods 0.000 claims description 26
- 239000004927 clay Substances 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000003960 organic solvent Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 51
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
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- 239000011780 sodium chloride Substances 0.000 description 2
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- 239000010779 crude oil Substances 0.000 description 1
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Abstract
The application discloses a method and a device for determining a saturation index of rock and soil. The method comprises the following steps: carrying out oil washing treatment on target rock soil; performing saturation treatment on the target rock soil after the oil washing treatment by adopting a mineral solution; drying the saturated target rock soil in a constant temperature and humidity environment, and determining a change relation between the resistance increase rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is completed; and determining the saturation index of the target rock and soil based on the change relationship between the resistance increase rate of the target rock and the water saturation of the target rock and soil. By the method and the device, the problem that the water saturation index of rock soil is difficult to accurately obtain in the related technology, so that the oil saturation of the reservoir is difficult to determine is solved.
Description
Technical Field
The application relates to the technical field of oil exploration, in particular to a method and a device for determining a saturation index of rock and soil.
Background
In the process of oil exploration, the oil saturation of a reservoir needs to be calculated by adopting an Archie's formula, wherein a saturation index value is an important parameter for calculating the oil saturation of the reservoir and needs to be accurately determined.
At present, the determination of the saturation index value mainly adopts an oil-water flooding method, and a relation graph of water saturation and resistance increase rate is drawn by measuring changes of water saturation and resistivity under different displacement pressures, so as to determine the saturation index value. However, the permeability of the high clay-containing rock sample is poor, and it is difficult to accurately determine the saturation index value by using an oil-water flooding method, and the specific reasons are as follows: the permeability is poor, the displacement difficulty is high, and the displaced water quantity is small, so that the measurement is inaccurate.
Aiming at the problem that the water saturation index of rock soil is difficult to accurately obtain in the related technology, so that the oil saturation of a reservoir is difficult to determine, an effective solution is not provided at present.
Disclosure of Invention
The application provides a method and a device for determining a saturation index of rock and soil, which are used for solving the problem that the water saturation index of the rock and soil is difficult to accurately obtain in the related technology, so that the oil saturation of a reservoir stratum is difficult to determine.
According to one aspect of the application, a method for determining a saturation index of rock and soil is provided. The method comprises the following steps: carrying out oil washing treatment on target rock soil; performing saturation treatment on the target rock soil after the oil washing treatment by adopting a mineral solution; drying the saturated target rock soil in a constant temperature and humidity environment, and determining a change relation between the resistance increase rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is completed; and determining the saturation index of the target rock and soil based on the change relationship between the resistance increase rate of the target rock and the water saturation of the target rock and soil.
In an optional embodiment, the target drying process of the target rock soil is determined to be completed in the following way: measuring a nuclear magnetic resonance T2 spectrum of the target rock and soil in the drying process; detecting whether the nuclear magnetic resonance T2 spectrum reaches a preset value, wherein the preset value is used for representing that only clay bound water is contained in the target rock and soil; and under the condition that the nuclear magnetic resonance T2 spectrum reaches a preset value, determining that the target drying process of the target rock soil is finished.
In an alternative embodiment, the determining a variation relationship between the resistivity increase rate of the target soil and the water saturation of the target soil using the data measured during the drying process includes: calculating a plurality of resistance increase rate data and a plurality of water saturation data of the target rock soil by using data measured by taking a preset time interval as a period; and determining a change relationship between the resistivity increase rate of the target rock and the water saturation of the target rock according to the plurality of resistivity increase rate data and the plurality of water saturation data.
In an alternative embodiment, the calculating of the rate of increase in resistance of the target rock-soil includes: acquiring a first resistivity of a target rock and soil at a first preset temperature, wherein the first preset temperature is used for simulating the temperature of the stratum in which the target rock and soil is located; acquiring a second resistivity of the target rock and soil measured at the target moment; and calculating the resistance increasing rate of the target rock soil at the target moment based on the first resistivity and the second resistivity.
In an alternative embodiment, calculating the water saturation of the target rock comprises: acquiring a first weight of a saturated target rock soil; acquiring a second weight of the target rock soil, wherein the second weight is obtained after the target rock soil is dried to a constant weight after the target drying process is completed; acquiring a third weight of the target rock soil measured at the target moment; and calculating the water saturation of the target rock soil at the target moment based on the first weight, the second weight and the third weight.
In an alternative embodiment, the determining the saturation index of the target rock based on the variation relationship between the resistivity growth rate of the target rock and the water saturation of the target rock comprises: drawing a variation relation curve between the resistance increase rate and the water saturation according to the plurality of resistance increase rate data and the plurality of water saturation data; acquiring a target curve segment from the change relation curve, wherein the target curve segment is used for representing the change relation between the resistance increase rate and the water saturation when the target rock soil contains movable water; and determining a saturation index of the target rock soil based on the change relation between the resistance increase rate and the water saturation in the target curve segment.
In an alternative embodiment, determining the saturation index of the target rock based on the relationship between the rate of resistance increase and the water saturation in the target curve segment comprises: and determining the saturation index of the target rock and soil according to the exponential relation between the water saturation and the resistance increasing rate.
In an alternative embodiment, obtaining the first resistivity of the target earth at the first preset temperature comprises: heating the saturated target rock soil before drying the saturated target rock soil in a constant temperature and humidity environment; and under the condition that the target rock and soil are heated to reach a first preset temperature, measuring the resistivity of the target rock and soil to obtain a first resistivity.
In an alternative embodiment, the obtaining the second weight of the target rock-soil comprises: after the target drying process is finished, drying the target rock soil to constant weight at a second preset temperature, wherein the second preset temperature is higher than the drying temperature in the target drying process; and measuring the weight of the target rock soil after the constant weight is reached to obtain a second weight.
In an alternative embodiment, the oil washing treatment of the target rock soil comprises the following steps: and (3) carrying out oil washing treatment on the target rock soil by adopting an organic solvent.
According to another aspect of the present application, there is provided an apparatus for determining a saturation index of rock and soil. The device includes: the oil washing processing unit is used for carrying out oil washing processing on target rock soil; the saturation treatment unit is used for performing saturation treatment on the target rock soil after the oil washing treatment by adopting a mineral solution; the drying unit is used for drying the saturated target rock soil in a constant temperature and humidity environment, and determining the change relation between the resistance increasing rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is finished; and the determining unit is used for determining the saturation index of the target rock and soil based on the change relation between the resistance increasing rate of the target rock and the water saturation of the target rock and soil.
In order to achieve the above object, according to another aspect of the present application, there is provided a storage medium including a stored program, wherein the program performs any one of the above-described methods of determining a saturation index of rock and soil.
In order to achieve the above object, according to another aspect of the present application, there is provided a processor for executing a program, wherein the program executes a method for determining a saturation index of rock and soil according to any one of the above methods.
Through the application, the following steps are adopted: carrying out oil washing treatment on target rock soil; performing saturation treatment on the target rock soil after the oil washing treatment by adopting a mineral solution; drying the saturated target rock soil in a constant temperature and humidity environment, and determining a change relation between the resistance increase rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is completed; the saturation index of the target rock and soil is determined based on the change relationship between the resistance increase rate of the target rock and the water saturation of the target rock and soil, and the problem that the water saturation index of the rock and soil is difficult to accurately obtain in the related technology, so that the oil saturation of a reservoir is difficult to determine is solved. And then the effect of accurately obtaining the water saturation index of rock soil so as to accurately determine the oil saturation of the reservoir stratum is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a flowchart of a method for determining a saturation index of rock and soil according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a nuclear magnetic resonance T2 spectrum in a drying process in a method for determining a saturation index of rock and soil according to an embodiment of the application;
FIG. 3 is a graph showing a relationship between a resistance increase rate and water saturation in a method for determining a saturation index of rock and soil according to an embodiment of the present application;
FIG. 4 is a scatter plot fit between the resistivity increase rate and the water saturation in a method for determining a saturation index of a rock soil according to an embodiment of the present application; and
fig. 5 is a schematic diagram of a device for determining a saturation index of rock and soil according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, 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 partial embodiments of the present application, but not all 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.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to the embodiment of the application, a method for determining the saturation index of rock soil is provided.
Fig. 1 is a flowchart of a method for determining a saturation index of rock and soil according to an embodiment of the present application. As shown in fig. 1, the method comprises the steps of:
and step S101, performing oil washing treatment on the target rock soil.
Specifically, in this embodiment, the target rock and soil volume can be 5/52 high clay conglomerate sample of Xinjiang oil field X well, process the target rock and soil to suitable size, for example, can process to diameter 25.4mm, length 25 ~ 50mm to guarantee that the sample terminal surface requires to be straight, sample terminal surface and sample axial plane contained angle will be close to 90. It should be noted that the sample may be a closed coring sample or a conventional coring sample, and the sample does not need to be specially stored, and the evaporation of the sample fluid does not affect the measurement result.
And after obtaining the target rock soil, carrying out oil washing treatment on the target rock soil to prepare for saturation testing.
Optionally, in the method for determining a saturation index of rock soil provided in an embodiment of the present application, the oil washing treatment on the target rock soil includes: and (3) carrying out oil washing treatment on the target rock soil by adopting an organic solvent.
The crude oil contained in the rock sample can be sufficiently washed away by washing the oil with the organic solvent.
And S102, performing saturation treatment on the target rock soil after the oil washing treatment by adopting a mineral solution.
Specifically, the mineral solution can be saline water with high mineralization degree, and the saline water with high mineralization degree is used for saturating target rock soil, so that the clay in the rock core is prevented from absorbing water and expanding to damage a sample.
And S103, drying the saturated target rock soil in a constant temperature and humidity environment, and determining the change relationship between the resistance increasing rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is finished.
It should be noted that, the target rock and soil after saturation treatment is dried, the target rock and soil gradually loses water, the movable water is lost firstly, then part of capillary bound water is lost, finally the clay bound water is obtained, and the resistance increase rate of the target rock and the water saturation of the target rock and soil can be calculated according to the data measured in the water loss process, so that the change relationship between the resistance increase rate and the water saturation of the target rock and soil is determined.
Optionally, in the method for determining the saturation index of rock and soil provided in the embodiment of the present application, the following method is adopted to complete the target drying process of the target rock and soil: measuring a nuclear magnetic resonance T2 spectrum of the target rock and soil in the drying process; detecting whether the nuclear magnetic resonance T2 spectrum reaches a preset value, wherein the preset value is used for representing that only clay bound water is contained in the target rock and soil; and under the condition that the nuclear magnetic resonance T2 spectrum reaches a preset value, determining that the target drying process of the target rock soil is finished.
It should be noted that in the case that the clay bound water is only contained in the target rock soil after drying, the clay bound water is not contained, so that the saturation index can be determined according to the relationship between the resistivity and the water saturation in the process that the target rock soil loses the mobile water.
Since the nuclear magnetic resonance T2 spectrum reflects the content of hydrogen atoms in water, whether the target rock and soil is dried to contain only clay bound water can be determined by measuring the nuclear magnetic resonance T2 spectrum of the target rock and soil, so as to determine whether the target drying process is completed. As shown in fig. 2, which is a schematic diagram of nmr T2 spectra under different drying time conditions, it can be seen from fig. 2 that the signal of long T2 spectrum gradually disappears between 0 and 1 hour after drying, indicating that mobile water in larger pores is dried out, and when the drying time reaches 4 hours, the peak value of nmr T2 spectrum remains unchanged, the amplitude becomes small, indicating that water adsorbed by clay begins to be lost after drying for 4 hours.
Optionally, in the method for determining a saturation index of rock and soil provided in an embodiment of the present application, determining a change relationship between a resistance increase rate of target rock and a water saturation of the target rock and soil using data measured in a drying process includes: calculating a plurality of resistance increase rate data and a plurality of water saturation data of the target rock soil by using data measured by taking a preset time interval as a period; and determining a change relationship between the resistivity increase rate of the target rock and the water saturation of the target rock according to the plurality of resistivity increase rate data and the plurality of water saturation data.
Specifically, the sample is placed in a constant-temperature constant-humidity oven to be dried, the preset time interval can be 30 minutes, and the nuclear magnetic resonance T2 spectrum and the resistivity R of the target rock soil are measured once every 30 minutesxAnd mass mxAnd calculating a plurality of resistance increase rate data and a plurality of water saturation data of the target rock soil based on the measured data, thereby determining a change relationship between the resistance increase rate and the water saturation.
Optionally, in the method for determining a saturation index of rock soil provided in an embodiment of the present application, calculating a resistance increase rate of a target rock soil includes: acquiring a first resistivity of a target rock and soil at a first preset temperature, wherein the first preset temperature is used for simulating the temperature of the stratum in which the target rock and soil is located; acquiring a second resistivity of the target rock and soil measured at the target moment; and calculating the resistance increasing rate of the target rock soil at the target moment based on the first resistivity and the second resistivity.
Specifically, the resistance increase rate of the target rock and soil at the target moment can be calculated according to the following formula:
wherein R isxRepresenting a second resistivity, R, of the target rock0Representing the first resistivity, I, of the target rockxAnd the resistance increase rate of the target rock soil at the target moment is shown.
Optionally, in the method for determining a saturation index of rock and soil provided in the embodiment of the present application, the obtaining a first resistivity of a target rock and soil at a first preset temperature includes: heating the saturated target rock soil before drying the saturated target rock soil in a constant temperature and humidity environment; and under the condition that the target rock and soil are heated to reach a first preset temperature, measuring the resistivity of the target rock and soil to obtain a first resistivity.
It should be noted that the temperature of the stratum in which the Xinjiang oilfield X well 5/52 high clay conglomerate sample is located is about 60 ℃, the saturated target rock and soil are placed in a constant temperature and humidity oven to be heated until the temperature of the saturated solution reaches 60 ℃, and the nuclear magnetic resonance T2 spectrum and the resistivity R of the saturated rock sample are measured0R is to be0As the first resistivity.
Optionally, in the method for determining a saturation index of rock soil provided in an embodiment of the present application, calculating the water saturation of the target rock soil includes: acquiring a first weight of a saturated target rock soil; acquiring a second weight of the target rock soil, wherein the second weight is obtained after the target rock soil is dried to a constant weight after the target drying process is completed; acquiring a third weight of the target rock soil measured at the target moment; and calculating the water saturation of the target rock soil at the target moment based on the first weight, the second weight and the third weight.
Specifically, the water saturation of the target rock and soil at the target moment can be calculated according to the following formula:
wherein m isxRepresenting a third weight of the target soil, m representing a first weight of the target soil, m0Representing a first weight, S, of the target rockwxAnd representing the water saturation of the target rock soil at the target moment.
Optionally, in the method for determining a saturation index of rock and soil provided in an embodiment of the present application, the obtaining a second weight of the target rock and soil includes: after the target drying process is finished, drying the target rock soil to constant weight at a second preset temperature, wherein the second preset temperature is higher than the drying temperature in the target drying process; and measuring the weight of the target rock soil after the constant weight is reached to obtain a second weight.
It should be noted that, the target rock soil can be dried to a constant weight at the second preset temperature, for example, the second preset temperature can be 105 ℃, the target rock soil is dried to a constant weight in an environment of 105 ℃, and the dry weight m of the target rock soil is measured0M is0As the first weight.
And step S104, determining the saturation index of the target rock and soil based on the change relation between the resistance increasing rate of the target rock and the water saturation of the target rock and soil.
It should be noted that the quantitative formula between the resistance increase rate and the water saturation of the target rock and soil is an exponential relationship, the saturation index of the target rock and soil can be determined according to the exponential relationship between the resistance increase rate and the water saturation, and then the saturation index is substituted into the Archie formula, so that the oil saturation of the target rock and soil can be calculated.
Optionally, in the method for determining a saturation index of rock-soil provided in an embodiment of the present application, determining the saturation index of the target rock-soil based on a variation relationship between a resistivity increase rate of the target rock-soil and a water saturation of the target rock-soil includes: drawing a variation relation curve between the resistance increase rate and the water saturation according to the plurality of resistance increase rate data and the plurality of water saturation data; acquiring a target curve segment from the change relation curve, wherein the target curve segment is used for representing the change relation between the resistance increase rate and the water saturation when the target rock soil contains movable water; and determining a saturation index of the target rock soil based on the change relation between the resistance increase rate and the water saturation in the target curve segment.
As shown in table 1, the measured mass data and resistivity data during the drying for 0 to 5 hours, and the resistance increase rate and water saturation calculated from the measured data.
TABLE 1
As shown in fig. 3, a relation graph of water saturation and resistance increase rate is prepared by using the resistance increase rate and the water saturation calculated in table 1, a movable water saturation portion, a capillary irreducible water saturation portion and a clay irreducible water saturation portion can be distinguished according to two inflection points a and b in the relation graph, and the movable water saturation portion is determined as a target curve segment.
Optionally, in the method for determining a saturation index of rock soil provided in an embodiment of the present application, determining the saturation index of the target rock soil based on a variation relationship between a resistance increase rate and a water saturation in the target curve segment includes: and determining the saturation index of the target rock and soil according to the exponential relation between the water saturation and the resistance increasing rate.
It should be noted that the saturation index n can be determined from the relationship between the degree of water saturation of the movable water saturation portion and the rate of increase in electrical resistance. Specifically, as shown in fig. 4, by using the method of scatter-point fitting, it can be determined that the quantitative formula between the water saturation and the resistance increase rate is an exponential relationship, and the exponential value 2.184 is the saturation exponent n value.
According to the method for determining the saturation index of the rock soil, provided by the embodiment of the application, the oil washing treatment is carried out on the target rock soil; performing saturation treatment on the target rock soil after the oil washing treatment by adopting a mineral solution; drying the saturated target rock soil in a constant temperature and humidity environment, and determining a change relation between the resistance increase rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is completed; the saturation index of the target rock and soil is determined based on the change relationship between the resistance increase rate of the target rock and the water saturation of the target rock and soil, and the problem that the water saturation index of the rock and soil is difficult to accurately obtain in the related technology, so that the oil saturation of a reservoir is difficult to determine is solved. And then the effect of accurately obtaining the water saturation index of rock soil so as to accurately determine the oil saturation of the reservoir stratum is achieved.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
The embodiment of the present application further provides a device for determining a saturation index of rock and soil, and it should be noted that the device for determining a saturation index of rock and soil according to the embodiment of the present application may be used to execute the method for determining a saturation index of rock and soil according to the embodiment of the present application. The device for determining the saturation index of rock soil provided by the embodiment of the application is introduced below.
Fig. 5 is a schematic diagram of an apparatus for determining a saturation index of rock and soil according to an embodiment of the present application. As shown in fig. 5, the apparatus includes: a wash oil processing unit 51, a saturation processing unit 52, a drying unit 53, and a determination unit 54.
Specifically, the oil washing processing unit 51 is used for performing oil washing processing on target rock soil.
And the saturation processing unit 52 is used for performing saturation processing on the target rock soil after the oil washing processing by adopting a mineral solution.
And the drying unit 53 is used for drying the saturated target rock soil in a constant temperature and humidity environment, and determining a change relation between the resistance increasing rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is completed.
And the determining unit 54 is used for determining the saturation index of the target rock and soil based on the change relation between the resistance increasing rate of the target rock and the water saturation of the target rock and soil.
Optionally, in the apparatus for determining a saturation index of rock and soil provided in an embodiment of the present application, the drying unit 53 includes: the first determining module is used for determining the completion of a target drying process of target rock soil and comprises the following steps: the first measurement submodule is used for measuring a nuclear magnetic resonance T2 spectrum of the target rock and soil in the drying process; the detection submodule is used for detecting whether the nuclear magnetic resonance T2 spectrum reaches a preset value, wherein the preset value is used for representing that only clay bound water is contained in the target rock soil; and the first determining submodule is used for determining that the target drying process of the target rock soil is completed under the condition that the nuclear magnetic resonance T2 spectrum reaches a preset value.
Optionally, in the apparatus for determining a saturation index of rock and soil provided in an embodiment of the present application, the drying unit 53 includes: the second determination module is used for determining the change relationship between the resistance increase rate of the target rock soil and the water saturation of the target rock soil by using the data measured in the drying process, and comprises the following steps: the calculation submodule is used for calculating a plurality of resistance increase rate data and a plurality of water saturation data of the target rock soil by using data measured by taking a preset time interval as a period; and the second determining sub-module is used for determining the change relation between the resistivity increase rate of the target rock soil and the water saturation of the target rock soil according to the plurality of resistivity increase rate data and the plurality of water saturation data.
Optionally, in the apparatus for determining a saturation index of rock and soil provided in an embodiment of the present application, the calculating submodule includes: the first obtaining sub-module is used for obtaining a first resistivity of the target rock and soil at a first preset temperature, wherein the first preset temperature is used for simulating the temperature of the stratum where the target rock and soil is located; the second obtaining submodule is used for obtaining a second resistivity of the target rock and soil measured at the target moment; and the first calculation submodule is used for calculating the resistance increase rate of the target rock soil at the target moment based on the first resistivity and the second resistivity.
Optionally, in the apparatus for determining a saturation index of rock and soil provided in an embodiment of the present application, the calculating submodule includes: the third acquisition submodule is used for acquiring the first weight of the saturated target rock soil; the fourth obtaining submodule is used for obtaining a second weight of the target rock soil, wherein the second weight is obtained after the target rock soil is dried to a constant weight after the target drying process is completed; the fifth obtaining submodule is used for obtaining a third weight of the target rock soil measured at the target moment; and the second calculation sub-module is used for calculating the water saturation of the target rock soil at the moment of the target based on the first weight, the second weight and the third weight.
Optionally, in the apparatus for determining a saturation index of rock and soil provided in an embodiment of the present application, the determining unit 54 includes: the drawing module is used for drawing a change relation curve between the resistance increasing rate and the water saturation according to the plurality of resistance increasing rate data and the plurality of water saturation data; the acquisition module is used for acquiring a target curve segment from the change relation curve, wherein the target curve segment is used for representing the change relation between the resistance increase rate and the water saturation when the target rock soil contains movable water; and the third determination module is used for determining the saturation index of the target rock soil based on the change relation between the resistance increasing rate and the water saturation in the target curve segment.
Optionally, in the apparatus for determining a saturation index of rock and soil provided in an embodiment of the present application, the third determining module includes: and the third determining submodule is used for determining the saturation index of the target rock soil according to the exponential relation between the water saturation and the resistance increasing rate.
Optionally, in the apparatus for determining a saturation index of rock and soil provided in an embodiment of the present application, the first obtaining sub-module includes: the heating submodule is used for heating the saturated target rock soil before drying the saturated target rock soil in a constant temperature and humidity environment; and the second measuring submodule is used for measuring the resistivity of the target rock and soil under the condition that the target rock and soil are heated to reach the first preset temperature, so as to obtain the first resistivity.
Optionally, in the apparatus for determining a saturation index of rock and soil provided in an embodiment of the present application, the fourth obtaining sub-module includes: the drying submodule is used for drying the target rock soil to constant weight at a second preset temperature after the target drying process is finished, wherein the second preset temperature is higher than the drying temperature in the target drying process; and the third measuring submodule is used for measuring the weight of the target rock and soil after the constant weight is reached to obtain a second weight.
Optionally, in the apparatus for determining a saturation index of rock and soil provided in an embodiment of the present application, the wash oil processing unit 51 includes: and the oil washing processing module is used for carrying out oil washing processing on the target rock soil by adopting an organic solvent.
According to the device for determining the saturation index of the rock soil, provided by the embodiment of the application, the oil washing processing is carried out on the target rock soil through the oil washing processing unit 51; the saturation processing unit 52 is configured to perform saturation processing on the target rock and soil after the oil washing processing by using a mineral solution; the drying unit 53 dries the saturated target rock soil in a constant temperature and humidity environment, and determines a change relationship between the resistance increase rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is completed; the determining unit 54 determines the saturation index of the target rock and soil based on the change relationship between the resistance increase rate of the target rock and the water saturation of the target rock and soil, solves the problem that the water saturation index of the rock and soil is difficult to accurately obtain in the related technology, so that the oil saturation of the reservoir is difficult to determine, and further achieves the effect of accurately obtaining the water saturation index of the rock and soil, so that the oil saturation of the reservoir is accurately determined.
The device for determining the saturation index of rock and soil comprises a processor and a memory, wherein the oil washing processing unit 51, the saturation processing unit 52, the drying unit 53, the determining unit 54 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. One or more than one kernel can be set, and the water saturation index of rock soil is accurately acquired by adjusting the kernel parameters, so that the problem of reservoir oil saturation is difficult to determine.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
An embodiment of the present invention provides a storage medium having a program stored thereon, the program implementing a method of determining a saturation index of rock and soil when executed by a processor.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program executes the method for determining the saturation index of the rock soil during running.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor executes the program and realizes the following steps: carrying out oil washing treatment on target rock soil; performing saturation treatment on the target rock soil after the oil washing treatment by adopting a mineral solution; drying the saturated target rock soil in a constant temperature and humidity environment, and determining a change relation between the resistance increase rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is completed; and determining the saturation index of the target rock and soil based on the change relationship between the resistance increase rate of the target rock and the water saturation of the target rock and soil.
The target drying process of the target rock soil is determined to be completed in the following mode: measuring a nuclear magnetic resonance T2 spectrum of the target rock and soil in the drying process; detecting whether the nuclear magnetic resonance T2 spectrum reaches a preset value, wherein the preset value is used for representing that only clay bound water is contained in the target rock and soil; and under the condition that the nuclear magnetic resonance T2 spectrum reaches a preset value, determining that the target drying process of the target rock soil is finished.
Determining a change relationship between the resistance increase rate of the target rock and the water saturation of the target rock by using data measured in the drying process includes: calculating a plurality of resistance increase rate data and a plurality of water saturation data of the target rock soil by using data measured by taking a preset time interval as a period; and determining a change relationship between the resistivity increase rate of the target rock and the water saturation of the target rock according to the plurality of resistivity increase rate data and the plurality of water saturation data.
The calculating of the resistance increase rate of the target rock-soil includes: acquiring a first resistivity of a target rock and soil at a first preset temperature, wherein the first preset temperature is used for simulating the temperature of the stratum in which the target rock and soil is located; acquiring a second resistivity of the target rock and soil measured at the target moment; and calculating the resistance increasing rate of the target rock soil at the target moment based on the first resistivity and the second resistivity.
Calculating the water saturation of the target rock soil comprises the following steps: acquiring a first weight of a saturated target rock soil; acquiring a second weight of the target rock soil, wherein the second weight is obtained after the target rock soil is dried to a constant weight after the target drying process is completed; acquiring a third weight of the target rock soil measured at the target moment; and calculating the water saturation of the target rock soil at the target moment based on the first weight, the second weight and the third weight.
Determining a saturation index of the target rock-soil based on a variation relationship between a resistance increase rate of the target rock-soil and a water saturation of the target rock-soil includes: drawing a variation relation curve between the resistance increase rate and the water saturation according to the plurality of resistance increase rate data and the plurality of water saturation data; acquiring a target curve segment from the change relation curve, wherein the target curve segment is used for representing the change relation between the resistance increase rate and the water saturation when the target rock soil contains movable water; and determining a saturation index of the target rock soil based on the change relation between the resistance increase rate and the water saturation in the target curve segment.
Determining a saturation index of the target rock based on a relationship between a rate of resistance increase and water saturation in the target curve segment comprises: and determining the saturation index of the target rock and soil according to the exponential relation between the water saturation and the resistance increasing rate.
Obtaining a first resistivity of a target rock at a first preset temperature comprises: heating the saturated target rock soil before drying the saturated target rock soil in a constant temperature and humidity environment; and under the condition that the target rock and soil are heated to reach a first preset temperature, measuring the resistivity of the target rock and soil to obtain a first resistivity.
Acquiring the second weight of the target rock soil comprises the following steps: after the target drying process is finished, drying the target rock soil to constant weight at a second preset temperature, wherein the second preset temperature is higher than the drying temperature in the target drying process; and measuring the weight of the target rock soil after the constant weight is reached to obtain a second weight.
The oil washing treatment of the target rock soil comprises the following steps: and (3) carrying out oil washing treatment on the target rock soil by adopting an organic solvent. The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: carrying out oil washing treatment on target rock soil; performing saturation treatment on the target rock soil after the oil washing treatment by adopting a mineral solution; drying the saturated target rock soil in a constant temperature and humidity environment, and determining a change relation between the resistance increase rate of the target rock soil and the water saturation of the target rock soil by using data measured in the drying process after the target drying process is completed; and determining the saturation index of the target rock and soil based on the change relationship between the resistance increase rate of the target rock and the water saturation of the target rock and soil.
The target drying process of the target rock soil is determined to be completed in the following mode: measuring a nuclear magnetic resonance T2 spectrum of the target rock and soil in the drying process; detecting whether the nuclear magnetic resonance T2 spectrum reaches a preset value, wherein the preset value is used for representing that only clay bound water is contained in the target rock and soil; and under the condition that the nuclear magnetic resonance T2 spectrum reaches a preset value, determining that the target drying process of the target rock soil is finished.
Determining a change relationship between the resistance increase rate of the target rock and the water saturation of the target rock by using data measured in the drying process includes: calculating a plurality of resistance increase rate data and a plurality of water saturation data of the target rock soil by using data measured by taking a preset time interval as a period; and determining a change relationship between the resistivity increase rate of the target rock and the water saturation of the target rock according to the plurality of resistivity increase rate data and the plurality of water saturation data.
The calculating of the resistance increase rate of the target rock-soil includes: acquiring a first resistivity of a target rock and soil at a first preset temperature, wherein the first preset temperature is used for simulating the temperature of the stratum in which the target rock and soil is located; acquiring a second resistivity of the target rock and soil measured at the target moment; and calculating the resistance increasing rate of the target rock soil at the target moment based on the first resistivity and the second resistivity.
Calculating the water saturation of the target rock soil comprises the following steps: acquiring a first weight of a saturated target rock soil; acquiring a second weight of the target rock soil, wherein the second weight is obtained after the target rock soil is dried to a constant weight after the target drying process is completed; acquiring a third weight of the target rock soil measured at the target moment; and calculating the water saturation of the target rock soil at the target moment based on the first weight, the second weight and the third weight.
Determining a saturation index of the target rock-soil based on a variation relationship between a resistance increase rate of the target rock-soil and a water saturation of the target rock-soil includes: drawing a variation relation curve between the resistance increase rate and the water saturation according to the plurality of resistance increase rate data and the plurality of water saturation data; acquiring a target curve segment from the change relation curve, wherein the target curve segment is used for representing the change relation between the resistance increase rate and the water saturation when the target rock soil contains movable water; and determining a saturation index of the target rock soil based on the change relation between the resistance increase rate and the water saturation in the target curve segment.
Determining a saturation index of the target rock based on a relationship between a rate of resistance increase and water saturation in the target curve segment comprises: and determining the saturation index of the target rock and soil according to the exponential relation between the water saturation and the resistance increasing rate.
Obtaining a first resistivity of a target rock at a first preset temperature comprises: heating the saturated target rock soil before drying the saturated target rock soil in a constant temperature and humidity environment; and under the condition that the target rock and soil are heated to reach a first preset temperature, measuring the resistivity of the target rock and soil to obtain a first resistivity.
Acquiring the second weight of the target rock soil comprises the following steps: after the target drying process is finished, drying the target rock soil to constant weight at a second preset temperature, wherein the second preset temperature is higher than the drying temperature in the target drying process; and measuring the weight of the target rock soil after the constant weight is reached to obtain a second weight.
The oil washing treatment of the target rock soil comprises the following steps: and (3) carrying out oil washing treatment on the target rock soil by adopting an organic solvent.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory 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). The 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, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A method of determining a saturation index of a rock sample, comprising:
performing oil washing treatment on a target rock sample;
performing saturation treatment on the target rock sample subjected to oil washing treatment by using a mineral solution;
drying the target rock sample after saturation treatment in a constant temperature and humidity environment, and determining a change relation between the resistance increase rate of the target rock sample and the water saturation of the target rock sample by using data measured in the drying process after the target drying process is finished;
determining a saturation index for the target rock sample based on a relationship of change between the rate of resistivity increase of the target rock sample and the water saturation of the target rock sample;
wherein the target drying process for the target rock sample is determined to be complete in the following manner: measuring the nuclear magnetic resonance T2 spectrum of the target rock sample during the drying process; detecting whether the nuclear magnetic resonance T2 spectrum reaches a preset value, wherein the preset value is used for representing that the target rock sample only contains clay bound water; determining that the target drying process of the target rock sample is completed under the condition that the nuclear magnetic resonance T2 spectrum reaches a preset value;
wherein determining a relationship between a rate of increase of electrical resistance of the target rock sample and a water saturation of the target rock sample using data measured during the drying process comprises: calculating a plurality of resistivity increase rate data and a plurality of water saturation data of the target rock sample using data measured at predetermined time intervals as cycles; determining a relationship between the rate of increase of electrical resistance of the target rock sample and the water saturation of the target rock sample from the plurality of rate of increase of electrical resistance data and the plurality of water saturation data, wherein the measured data is a nuclear magnetic resonance T2 spectrum, resistivity, and mass of the target rock;
wherein determining a saturation index for the target rock sample based on the relationship between the rate of resistivity increase of the target rock sample and the water saturation of the target rock sample comprises: drawing a change relation curve between the resistance increase rate and the water saturation according to the obtained multiple resistance increase rate data and multiple water saturation data; obtaining a target curve segment in the variation relation curve, wherein the target curve segment is used for representing the variation relation between the resistance increasing rate and the water saturation when the target rock sample contains movable water; determining a saturation index for the target rock sample based on a relationship of change between the rate of resistivity increase and the water saturation in the target curve segment;
calculating the rate of increase of electrical resistance of the target rock sample comprises: obtaining a first resistivity of the target rock sample at a first preset temperature, wherein the first preset temperature is used for simulating the temperature of the stratum where the target rock sample is located; obtaining a second resistivity of the target rock sample measured at the target moment; calculating a rate of increase of resistance of the target rock sample at the target time based on the first resistivity and the second resistivity;
obtaining a first resistivity of the target rock sample at a first preset temperature comprises: heating the saturated target rock sample in a constant temperature and humidity environment before drying the saturated target rock sample; and under the condition that the target rock sample is heated to reach a first preset temperature, measuring the resistivity of the target rock sample to obtain the first resistivity.
2. The method of claim 1, wherein calculating the water saturation of the target rock sample comprises:
obtaining a first weight of the target rock sample after saturation treatment;
obtaining a second weight of the target rock sample, wherein the second weight is obtained after the target rock sample is dried to a constant weight after the target drying process is completed;
obtaining a third weight of the target rock sample measured at the target scale;
calculating the water saturation of the target rock sample at the target time based on the first weight, the second weight, and the third weight.
3. The method of claim 1, wherein determining a saturation index for the target rock sample based on the relationship between the rate of resistivity increase and the water saturation in the target curve segment comprises:
determining a saturation index for the target rock sample based on an exponential relationship between the water saturation and the rate of resistivity increase.
4. The method of claim 1, wherein obtaining the second weight of the target rock sample comprises:
after the target drying process is finished, drying the target rock sample to constant weight at a second preset temperature, wherein the second preset temperature is higher than the drying temperature in the target drying process;
and measuring the weight of the target rock sample after the constant weight is reached to obtain a second weight.
5. The method of claim 1, wherein subjecting the target rock sample to an oil wash process comprises:
and carrying out oil washing treatment on the target rock sample by adopting an organic solvent.
6. An apparatus for determining a saturation index of a rock sample, comprising:
the oil washing processing unit is used for carrying out oil washing processing on the target rock sample;
the saturation treatment unit is used for performing saturation treatment on the target rock sample subjected to oil washing treatment by adopting a mineral solution;
the drying unit is used for drying the target rock sample after saturation treatment in a constant temperature and humidity environment, and determining a change relation between the resistance increase rate of the target rock sample and the water saturation of the target rock sample by using data measured in the drying process after the target drying process is finished;
a determination unit for determining a saturation index of the target rock sample based on a relationship of change between the rate of resistivity increase of the target rock sample and the water saturation of the target rock sample;
wherein the drying unit includes: a first determination module for determining completion of the target drying process of the target rock sample, comprising: a first measuring submodule for measuring a nuclear magnetic resonance T2 spectrum of the target rock sample during the drying process; the detection submodule is used for detecting whether the nuclear magnetic resonance T2 spectrum reaches a preset value, wherein the preset value is used for representing that the target rock sample only contains clay bound water; the first determining submodule is used for determining that the target drying process of the target rock sample is finished under the condition that the nuclear magnetic resonance T2 spectrum reaches a preset value;
the drying unit further includes: a second determining module for determining a relationship between a rate of resistivity increase of the target rock sample and a water saturation of the target rock sample using data measured during the drying process, comprising: a calculation submodule for calculating a plurality of resistivity growth data and a plurality of water saturation data for the target rock sample using data measured at predetermined time intervals for a period; a second determining sub-module for determining a relationship between the rate of resistance increase of the target rock sample and the water saturation of the target rock sample based on the plurality of rate of resistance increase data and the plurality of water saturation data, wherein the measured data is a nuclear magnetic resonance T2 spectrum, resistivity and mass of the target rock;
wherein the determination unit includes: the drawing module is used for drawing a change relation curve between the resistance increasing rate and the water saturation according to the obtained multiple resistance increasing rate data and multiple water saturation data; an obtaining module, configured to obtain a target curve segment in the variation curve, where the target curve segment is used to represent a variation relationship between the resistivity increase rate and the water saturation when the target rock sample contains mobile water; a third determination module for determining a saturation index for the target rock sample based on a relationship of change between the rate of resistivity increase and the water saturation in the target curve segment;
the calculation submodule includes: the first obtaining submodule is used for obtaining a first resistivity of the target rock sample at a first preset temperature, wherein the first preset temperature is used for simulating the temperature of the stratum where the target rock sample is located; the second obtaining submodule is used for obtaining a second resistivity of the target rock sample measured at the target moment; a first calculation submodule for calculating a rate of increase in resistance of the target rock sample at the target time based on the first resistivity and the second resistivity;
the first acquisition sub-module includes: the heating submodule is used for heating the target rock sample after saturation treatment in a constant temperature and humidity environment before drying the target rock sample after saturation treatment; and the second measuring submodule is used for measuring the resistivity of the target rock sample under the condition that the target rock sample is heated to reach a first preset temperature, so as to obtain the first resistivity.
7. A storage medium, characterized in that the storage medium comprises a stored program, wherein the program performs the method of determining a saturation index of a rock sample according to any one of claims 1 to 5.
8. A processor, characterized in that the processor is configured to run a program, wherein the program when run performs the method of determining a saturation index of a rock sample according to any one of claims 1 to 5.
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| CN111520134B (en) * | 2020-04-03 | 2023-06-06 | 中国科学院大学 | Method and device for acquiring original oil saturation, electronic equipment and storage medium |
| CN113029908B (en) * | 2021-03-16 | 2021-11-26 | 中国石油大学(华东) | Laboratory measurement method for compact reservoir saturation index |
| CN112986097B (en) * | 2021-03-16 | 2021-12-14 | 中国石油大学(华东) | Experimental measurement method for determining relative permeability curve of tight reservoir steady state method |
| CN113219007A (en) * | 2021-04-23 | 2021-08-06 | 中国石油化工股份有限公司 | Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area |
| CN113790996A (en) * | 2021-09-02 | 2021-12-14 | 东北石油大学 | Method for measuring saturation of rock core bound fluid based on centrifugal method |
| CN113790997A (en) * | 2021-09-02 | 2021-12-14 | 东北石油大学 | Method for measuring core bound fluid saturation based on gradient heat treatment technology |
| CN117420177B (en) * | 2023-12-14 | 2024-03-05 | 山东黄河顺成水利水电工程有限公司 | Method, equipment and medium for monitoring water erosion state of earth and rockfill embankment structure |
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