CN113866053A - Method and device for measuring spontaneous imbibition oil displacement rate of rock sample - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
Abstract
A method and a device for measuring spontaneous imbibition oil displacement rate of a rock sample. The method for measuring the spontaneous imbibition oil displacement rate of the rock sample comprises the following steps: measuring the volume of the dried rock sample and calculating the porosity of the rock sample; measuring the water saturation resistivity of the water-saturated rock sample; measuring the oil saturation quality of the oil saturation rock sample; carrying out imbibition operation on the oil-saturated rock sample, and measuring the imbibition resistivity of the rock sample; and calculating the spontaneous imbibition displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample. The method realizes the determination of the spontaneous imbibition oil displacement rate and the real-time detection of the spontaneous imbibition oil displacement rate of the rock sample by the method for measuring the resistivity of the rock sample in the imbibition process, has simple operation and high accuracy, and has profound significance for researching the self-absorption phenomenon of the low-permeability/compact reservoir.
Description
Technical Field
The invention belongs to the field of exploration and development, and particularly relates to a method and a device for measuring spontaneous imbibition oil displacement rate of a rock sample.
Background
The reserves of the compact oil in China are rich, the research on the development of the compact oil can effectively solve the problem of energy demand in China, and the compact oil has profound influence on the petroleum industry in China. The tight oil reservoir usually has the characteristics of low porosity, low permeability and low pressure, the difficulty of high-efficiency development is very high, most of tight oil reservoirs are water-wet, the prior art mainly adopts a volume method and a conventional weighing method to directly or indirectly measure the spontaneous imbibition oil displacement rate of the rock sample by natural imbibition, the measuring method is complex, and human errors and measuring errors exist, so that the accuracy of measuring the spontaneous imbibition oil displacement rate is not high.
Disclosure of Invention
The invention aims to provide a method and a device for measuring spontaneous imbibition oil displacement rate of a rock sample, which can be used for measuring the spontaneous imbibition oil displacement rate by a method for measuring the resistivity of the rock sample in an imbibition process, realizing the real-time detection of the spontaneous imbibition oil displacement rate of the rock sample, and have the advantages of simple operation, high accuracy and deep significance for researching the self-absorption phenomenon of a low-permeability/compact oil reservoir.
The inventor of the present invention found through research that the prior art method mainly adopts a volume method and a conventional weighing method to conduct natural imbibition research, wherein the problems of oil droplets dissolved in water, evaporation of liquid and the like are not considered, and the measurement error is obvious. And because the weight of the core in water is influenced by a plurality of factors, such as density change of the core and the water, adsorption of aqueous solution, change of the compression degree of liquid in the core caused by capillary force change in the imbibition process and the like, the weighing method has larger measurement error. Particularly for compact low-permeability rock samples, the measurement errors of a volume method and a weighing method are increased due to the long imbibition process and the small amount of the exudation oil. The inventor of the invention further researches and carries out the imbibition operation on the saturated oil rock sample and measures the imbibition resistivity of the rock sample; and calculating the spontaneous imbibition displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample, so that human errors and measurement errors are avoided, the accuracy of the spontaneous imbibition displacement rate is greatly improved, and the method is simple to operate.
In order to achieve the above object, an embodiment of the present invention provides a method for determining a spontaneous imbibition oil displacement rate of a rock sample, which is characterized by comprising: measuring the volume of the dried rock sample and calculating the porosity of the rock sample; measuring the water saturation resistivity of the water-saturated rock sample; measuring the oil saturation quality of the oil saturation rock sample; carrying out imbibition operation on the oil-saturated rock sample, and measuring the imbibition resistivity of the rock sample; and calculating the spontaneous imbibition displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample.
Optionally, the method further includes: calculating the spontaneous imbibition oil displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample, wherein the spontaneous imbibition oil displacement rate comprises calculating the oil saturation according to the imbibition resistivity and the water saturation resistivity of the rock sample; calculating oil displacement quality according to the oil saturation, volume and porosity of the rock sample; and calculating the spontaneous imbibition displacement rate according to the displacement mass and the saturated oil mass of the rock sample.
Optionally, calculating the oil saturation according to the imbibition resistivity and the water saturation resistivity of the rock sample includes:
wherein S isoIn order to obtain the degree of saturation of the oil,
Rtin order to imbibe the electrical resistivity,
Roin order to be water-saturated in resistivity,
n is a saturation index,
b is a coefficient.
Optionally, calculating the oil displacement quality according to the oil saturation, the volume and the porosity of the rock sample includes: m is1＝M-V*Ф*So*ρo
Wherein m is1For the purpose of the oil displacement quality,
m is the mass of the saturated oil,
v is the volume of the dry rock sample,
phi is the porosity of the dried rock sample,
Soin order to obtain the degree of saturation of the oil,
ρois the oil density.
Optionally, calculating a spontaneous imbibition displacement rate according to the displacement quality and the saturated oil quality of the rock sample, including:
wherein, I1In order to realize the spontaneous imbibition and oil displacement rate,
m1for the purpose of the oil displacement quality,
m is the saturated oil quality.
Optionally, the oil saturation rock sample is subjected to imbibition operation, the imbibition resistivity of the rock sample is measured, including the case injecting water of a threshold height, and the case is kept at a preset temperature.
Correspondingly, the embodiment of the invention also provides a device for measuring the spontaneous imbibition oil displacement rate of the rock sample, which is characterized by comprising the following components: the device comprises a box body, a rock sample fixing device and a resistivity measuring device; the resistivity measuring device comprises a resistivity measuring instrument which is connected with the saturated oil rock sample and is used for measuring the imbibition resistivity during imbibition.
Optionally, the spontaneous imbibition oil displacement device further comprises a liquid level monitoring device and a temperature control device; the liquid level monitoring device comprises a liquid level detector and a liquid level supply device; the temperature control device comprises a heater, a temperature collector and a constant temperature controller.
Optionally, the rock sample fixing device comprises a fixing cylinder and a blocking piece; the fixed cylinder is used for fixing the rock sample, and preferably a rubber cylinder; the blocking piece is located at one end of the rock sample and used for blocking oil production of the rock sample at the end, and a wet sandstone piece is preferred.
Optionally, the tank body is filled with water with a threshold height, and the tank body is kept at a preset temperature; and calculating the spontaneous imbibition displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample.
According to the technical scheme, the volume of the dry rock sample is measured, and the porosity of the rock sample is calculated; measuring the water saturation resistivity of the water-saturated rock sample; measuring the oil saturation quality of the oil saturation rock sample; carrying out imbibition operation on the oil-saturated rock sample, and measuring the imbibition resistivity of the rock sample; and calculating the spontaneous imbibition displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample. The method can solve human errors and measurement errors which cannot be avoided by conventional measurement methods such as a volume method and a weighing method in the prior art, greatly improves the accuracy of the spontaneous imbibition displacement rate, is simple to operate, realizes the real-time detection of the spontaneous imbibition displacement rate of the rock sample, and has profound significance for researching the self-absorption phenomenon of the low-permeability reservoir.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 and FIG. 2 are schematic flow charts of a method for measuring spontaneous imbibition oil displacement rate of a rock sample according to the invention;
FIG. 3 is a schematic diagram illustrating the change of the imbibition resistivity during the imbibition process of the saturated oil rock sample according to the present invention;
FIG. 4 is a schematic diagram of a device for measuring spontaneous imbibition oil displacement rate of a rock sample according to the invention;
FIG. 5 is a schematic diagram of spontaneous imbibition oil displacement rates respectively obtained by the resistivity method and volume method measuring devices of the invention.
Description of the reference numerals
1 case body 2 constant temperature controller
3 heater 4 temperature collector
5 thermal insulation material layer 6 water oil content analyzer
7 resistivity measuring instrument
9 vent 10 damper
11 fixed section of thick bamboo of rock specimen support 12
13 blocking piece 14 funnel-shaped glass container
15 graduated tube 16 liquid level supply device
17 liquid level detector 18 temperature regulating device
19 watering device
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
FIG. 1 is a schematic flow chart of a method for measuring spontaneous imbibition oil displacement rate of a rock sample according to the invention. As shown in fig. 1, the method for determining spontaneous imbibition oil displacement rate of a rock sample according to the embodiment of the invention may include the following steps: measuring the volume of the dried rock sample and calculating the porosity of the rock sample; measuring the water saturation resistivity of the water-saturated rock sample; measuring the oil saturation quality of the oil saturation rock sample; carrying out imbibition operation on the oil-saturated rock sample, and measuring the imbibition resistivity of the rock sample; and calculating the spontaneous imbibition displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample.
Step S101, measuring the volume of the dry rock sample and calculating the porosity. The rock sample is preferably tight sandstone, which generally has a porosity of 7-12% and a porosity of less than 1.0 x 10-3μm2The sandstone pore throat radius is generally less than 0.5 mu m. Drying the rock sample includes, but is not limited to, drying and air drying. The compact oil in the compact sandstone isThe petroleum gathering formed by clamping in or close to a compact reservoir stratum of a high-quality crude oil layer system and not carrying out large-scale long-distance migration is a petroleum resource which is symbiotic with or close to a crude oil rock system and is continuously distributed in a large area. The calculation method of the rock sample porosity comprises the following steps of not limiting to the empirical relationship established by using the sorting coefficient of the Beard and the like, and reading through a pore penetration R.
And S102, measuring the water saturation resistivity of the water-saturated rock sample. The resistivity is a physical quantity representing resistance characteristics of various substances. And carrying out water saturation treatment on the rock sample, and measuring the water saturation resistivity of the water saturation rock sample by adopting a resistivity measuring instrument. The preparation process of the water-saturated rock sample comprises the steps of putting the rock sample into a high-pressure core saturator, and enabling the pores of the rock sample to be fully saturated with water. Preferably, the pressure of the high-pressure core saturator is 30 MPa and the time is 48 hours.
Step S103, measuring the saturated oil quality of the saturated oil rock sample. The rock sample was subjected to a vacuum treatment and then to a saturation test oil. The vacuumizing method comprises the step of not limiting to placing the rock sample in a vacuum pumping device for vacuumizing. And measuring the oil saturation quality after the rock sample is completely saturated with oil, wherein the oil saturation quality is the oil mass absorbed after the rock sample is completely saturated with oil.
And step S104, carrying out imbibition operation on the oil-saturated rock sample, and measuring the imbibition resistivity of the rock sample. The imbibition operation is a process of replacing non-wetting phase fluid with wetting phase fluid by utilizing imbibition at a certain temperature, and the invention is a process of replacing oil with water. And putting the saturated oil rock sample into a device for measuring the spontaneous imbibition displacement rate of the rock sample, injecting water with a threshold height into the box body, keeping the box body at a preset temperature, opening the resistivity measuring instrument, and performing a spontaneous imbibition displacement experiment. And carrying out imbibition operation on the oil-saturated rock sample, measuring the imbibition resistivity of the rock sample, including injecting water with a threshold height into the box body, and keeping the box body at a preset temperature. The threshold height of the water is within the range of the liquid level height which can be detected by the liquid level detector. The preset temperature of the box body is the preset temperature for realizing the oil displacement operation of the device. The method for measuring the spontaneous imbibition displacement rate by measuring the resistivity through the resistivity measuring device is a resistivity method.
Fig. 3 is a schematic diagram of change of the imbibition resistivity in the imbibition process of the oil-saturated rock sample, as shown in fig. 3, in the imbibition process of the oil-saturated rock sample, a resistivity measuring instrument is used for recording the change of the imbibition resistivity of the rock sample in the spontaneous imbibition process, the imbibition resistivity is continuously increased along with the change of time until the imbibition is completed, and the imbibition resistivity reaches the maximum and is kept unchanged. And the completion of the imbibition indicates that the oil displacement quality of the saturated oil rock sample reaches the maximum.
And S105, calculating the spontaneous imbibition oil displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample. And calculating the spontaneous imbibition oil displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample obtained in the steps S101, S102, S103 and S104.
Fig. 2 is a specific embodiment of step S105. According to the specific implementation mode, the spontaneous imbibition oil displacement rate is calculated, and the method comprises the following steps:
calculating the spontaneous imbibition oil displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample, wherein the spontaneous imbibition oil displacement rate comprises calculating the oil saturation according to the imbibition resistivity and the water saturation resistivity of the rock sample; calculating the oil content according to the oil saturation, the volume and the porosity of the rock sample; and calculating the spontaneous imbibition displacement rate according to the oil-containing quality and the saturated oil quality of the rock sample.
Step S201 is to calculate the oil saturation of the rock sample, and includes: calculating the oil saturation according to the imbibition resistivity and the water saturation resistivity of the rock sample, and the method comprises the following steps:
wherein S isoIs the degree of oil saturation, RtTo imbibe resistivity, RoThe water saturation resistivity, n is the saturation index, and b is the coefficient. In the process of imbibition of the saturated oil rock sample, recording the change R of imbibition resistivity of the rock sample in the process of spontaneous imbibition by using a resistivity measuring instrumenttThe imbibition resistivity is continuously increased along with the change of time until imbibition is completed, and the imbibition resistance isThe rate reaches a maximum and remains unchanged. And the completion of the imbibition indicates that the oil displacement quality of the saturated oil rock sample reaches the maximum. The maximum value of the oil displacement mass is substituted into an Archie formula:
and So＝1-SwThe oil saturation S is obtained by calculationoIn which S iswFor water saturation, the saturation index n and the coefficient b are lithology dependent, and the values of n and b are different for different regional layers. Hydrocarbons (oil, gas) are not electrically conductive, so the greater the saturation of the hydrocarbons in the storage of the rock sample, the greater its resistivity. In the process of imbibition of the saturated oil rock sample, the imbibition resistivity is continuously reduced along with the change of time until imbibition is completed, and the imbibition resistivity is minimum and is kept unchanged.
Step S202 is to calculate the oil displacement mass, which comprises the steps of calculating the oil displacement mass according to the oil saturation, the volume and the porosity of the rock sample, and comprises the following steps: m is1＝M-V*Ф*So*ρoWherein m is1For displacement of reservoir oil, V is the volume of the dry rock sample, phi is the porosity of the dry rock sample, SoIs the oil saturation, poIs the oil density. Wherein V phi So*ρoAnd the quality of the residual oil contained in the rock sample after the oil displacement of the rock sample is finished. m is1The quality of the oil displaced from the rock sample. The oil saturation is obtained by step S201. The volume and the porosity of the dry rock sample are both obtained from the initial dry state of the rock sample, and the drying treatment of the rock sample comprises but is not limited to drying and air drying. Methods for calculating the porosity of the rock sample include but are not limited to Beard et al empirical relationships established using sorting coefficients, reading through pore infiltration in r.sneider charts, and the like.
Step S203 is to calculate the spontaneous imbibition displacement rate, which includes calculating the spontaneous imbibition displacement rate according to the displacement mass and the saturated oil mass of the rock sample, and includes: i is1＝m1/M wherein I1M is the spontaneous imbibition displacement rate1The oil displacement quality is M, and the saturated oil quality is M. And the completion of the imbibition indicates that the oil displacement quality of the saturated oil rock sample reaches the maximum.
FIG. 4 is a schematic diagram of a device for measuring spontaneous imbibition oil displacement rate of a rock sample, the device for measuring spontaneous imbibition oil displacement rate has a box structure, is strong in external interference resistance, and is provided with a damping mechanism at the bottom, so that the environmental stability of the device in the working process is effectively ensured. As shown in fig. 4, the device for measuring spontaneous imbibition oil displacement rate of a rock sample is characterized by comprising: the device comprises a box body 1, a rock sample fixing device and a resistivity measuring device; the resistivity measuring device comprises a resistivity measuring instrument 7, wherein the resistivity measuring instrument 7 is connected with the saturated oil rock sample and is used for measuring the imbibition resistivity during imbibition. The box body 1 is a closed container. The device for measuring the spontaneous imbibition displacement rate of the rock sample is mainly used for places where the sample and the imbibition liquid are placed for spontaneous imbibition displacement.
The resistivity measuring instrument 7 is positioned above the box body 1, a lead of the resistivity measuring instrument extends into the box body and is connected with two ends of the rock sample, the resistivity measuring instrument 7 is provided with a resistivity signal output end, the resistivity output end is connected with a computer, the resistivity change of the rock sample is transmitted to the computer system in real time and an image is generated, and the computer system can directly form an image of the resistivity change along with time on the computer.
The box body 1 comprises a heat insulation material layer 5 and a damping mechanism 10, wherein the heat insulation material layer is used for heat preservation of the box body, and the damping mechanism is used for reducing the influence of environmental vibration on a measuring instrument inside the box body. The upper part of the box body 1 is provided with a vent 9 for maintaining the atmospheric pressure in the box body.
The rock sample fixing device comprises a fixing cylinder 12 and a blocking sheet 13; the fixed cylinder 12 is used for fixing the rock sample, preferably a rubber cylinder; the blocking sheet 13 is located at one end of the rock sample and used for blocking oil production of the rock sample at the end, and a wet sand sheet is preferably selected and is a low-permeability and strong-water wet sand sheet. The rock sample is fixed in the fixed cylinder 12, the fixed cylinder 12 is placed on the rock sample support 11, prevents fixed cylinder 12 and box 1 direct contact, has effectively reduced the influence of external factor in the measurement process. The rubber tube wraps the periphery of the rock sample, so that water is prevented from entering the rock sample from the periphery, and oil is prevented from escaping from the periphery of the rock sample.
The resistivity measuring device comprises a resistivity measuring instrument 7, the resistivity measuring instrument 7 is positioned on the box body and connected with two ends of the rock sample, and the imbibition resistivity of the rock sample is measured when the saturated oil rock sample is subjected to imbibition operation. And the resistivity measuring instrument 7 extends two leads towards the interior of the box body 1 to be respectively connected with two ends of the rock sample and is used for measuring the resistivity change of the rock sample in the spontaneous imbibition oil displacement process. Hydrocarbons (oil, gas) are not electrically conductive, so the greater the saturation of the hydrocarbons in the storage of the rock sample, the greater its resistivity. In the process of imbibition of the saturated oil rock sample, the imbibition resistivity is continuously reduced along with the change of time until imbibition is completed, and the imbibition resistivity is minimum and is kept unchanged. And the completion of the imbibition indicates that the oil displacement quality of the saturated oil rock sample reaches the maximum. The method for measuring the spontaneous imbibition displacement rate by measuring the resistivity through the resistivity measuring device is a resistivity method.
The spontaneous imbibition oil displacement device also comprises a liquid level monitoring device and a temperature control device; the liquid level monitoring device comprises a liquid level detector 17 and a liquid level supply 16; the temperature control device comprises a heater 3, a temperature collector 4 and a constant temperature controller 2. And carrying out imbibition operation on the oil-saturated rock sample, measuring the imbibition resistivity of the rock sample, including injecting water with a threshold height into the box body, and keeping the box body at a preset temperature.
The liquid level detector 17 is used for detecting the liquid level of the box body, and the liquid level supplier 16 is used for supplying imbibition liquid to the box body, wherein the imbibition liquid is water. And when the liquid level height of the box body is smaller than the liquid level threshold value, corresponding warning is sent out, and the staff supplies, permeates and absorbs liquid to the box body through the liquid level supply device until the liquid level height is not smaller than the liquid level threshold value, so that the warning is eliminated. In the long-time spontaneous imbibition process, the liquid level of the liquid to be measured is kept constant, so that the error caused by liquid level difference in the measurement process is reduced, and the measurement accuracy is ensured. The liquid surface supply 16 is also used for the initial imbibition liquid injection.
The temperature control device realizes dynamic real-time temperature control and ensures the constant temperature of the box body 1. The constant temperature controller 2 obtains the temperature value of the temperature collector 4, compares the temperature threshold value, and when the collected temperature is lower than the temperature threshold value, the heater 3 is started to heat until the collected temperature is not lower than the temperature threshold value. The periphery of the box body 1 is also provided with a heat insulation material layer 5 in an attaching mode, and the heat insulation material layer 5 is used for heat preservation of the box body 1 and prevents the temperature of the box body 1 from being transmitted outwards. The temperature control device can simulate the formation temperature condition and provides practical significance for the development of actual formation compact oil. The box body is also provided with a ventilation opening 9, and the ventilation opening 9 is used for ventilating the box body and maintaining the air pressure in the box body 1.
The liquid level monitoring device, the temperature control device and the ventilation opening 9 ensure the stable environment in the rock sample imbibition process, and greatly reduce the interference of external factors in the measurement process.
The device for measuring the spontaneous imbibition oil displacement rate of the rock sample further comprises a measuring and comparing device adopting a volume method, wherein the measuring and comparing device comprises an oil content analyzer 6 in water, a funnel-shaped glass container 14, a graduated tube 15 and a water adding device 19. One side of the rock sample is connected with the funnel-shaped glass container 14, and the other side of the rock sample is connected with the blocking sheet 13, so that oil driven out by the rock sample only overflows from one side of the funnel-shaped glass container 14.
The mass of oil displaced during imbibition includes the mass of oil in the funnel-shaped glass container 14 and the mass of oil dissolved in water, since the oil is less dense than water and most of the oil will float to the water layer. The oil-in-water analyzer 6 is used for measuring the oil content of the oil dissolved in water in the process of rock sample imbibition. The oil in water data can be displayed directly on the oil in water analyzer 6. The graduated tube 15 is a thin tube, and is favorable for accurately reading the volume of oil. After the completion of the imbibition, if the oil does not reach the inside of the scale tube 15, the water adding device 19 adds water so that the oil reaches the scale tube 15, reads the volume Vo of the oil and the volume Vw of the water, and measures the oil content D in the water with the water-oil content analyzer 6. Calculating the mass m2 of the oil to be driven out by combining the volume Vo of the oil to be read, the volume Vw of the water and the oil content D in the watero+Vw*D*ρoWhere ρ isoIs the oil density, Vo rhooThe mass of oil in the funnel-shaped glass container 14, Vw D ρoIs the mass of oil dissolved in water. Calculating the spontaneous imbibition displacement rate according to the mass of the oil discharged and the mass of the saturated oil:
fig. 5 is a schematic diagram of spontaneous imbibition oil displacement rates respectively obtained by the resistivity method and the volume method measuring device of the invention, and as shown in the figure, comparing the spontaneous imbibition oil displacement rates respectively obtained by the resistivity method and the volume method measuring device of the invention, it can be seen that the value of the spontaneous imbibition oil displacement rate measured by the resistivity method is equivalent to the value measured by the volume method. But the resistivity method can solve human errors and measurement errors which cannot be avoided by conventional measurement methods such as a volume method, a weighing method and the like, greatly improves the accuracy of spontaneous imbibition oil displacement rate, is simple to operate, and has profound significance for researching the self-absorption phenomenon of the low-permeability reservoir.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A method for measuring spontaneous imbibition oil displacement rate of a rock sample is characterized by comprising the following steps:
measuring the volume of the dried rock sample and calculating the porosity of the rock sample;
measuring the water saturation resistivity of the water-saturated rock sample;
measuring the oil saturation quality of the oil saturation rock sample;
carrying out imbibition operation on the oil-saturated rock sample, and measuring the imbibition resistivity of the rock sample;
and calculating the spontaneous imbibition displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample.
2. The method of claim 1, wherein calculating a spontaneous imbibition displacement rate based on the volume, porosity, water saturation resistivity, oil saturation mass, and imbibition resistivity of the rock sample comprises
Calculating the oil saturation according to the imbibition resistivity and the water saturation resistivity of the rock sample;
calculating oil displacement quality according to the oil saturation, volume and porosity of the rock sample;
and calculating the spontaneous imbibition displacement rate according to the displacement mass and the saturated oil mass of the rock sample.
3. The method of claim 2, wherein calculating the oil saturation from the imbibition resistivity and the saturation resistivity of the rock sample comprises:
wherein S isoIn order to obtain the degree of saturation of the oil,
Rtin order to imbibe the electrical resistivity,
Roin order to be water-saturated in resistivity,
n is a saturation index,
b is a coefficient.
4. The method of claim 2, wherein calculating the displacement mass from the oil saturation, volume, and porosity of the rock sample comprises:
m1＝M-V*Ф*So*ρo
wherein m is1For the purpose of the oil displacement quality,
m is the mass of the saturated oil,
v is the volume of the dry rock sample,
phi is the porosity of the dried rock sample,
Soin order to obtain the degree of saturation of the oil,
ρois the oil density.
5. The method of claim 2, wherein calculating a spontaneous imbibition displacement rate from the displacement mass and the saturated mass of the rock sample comprises:
wherein, I1In order to realize the spontaneous imbibition and oil displacement rate,
m1for the purpose of the oil displacement quality,
m is the saturated oil quality.
6. The method of claim 1, wherein said subjecting the oil-saturated rock sample to a imbibition operation and measuring the imbibition resistivity of the rock sample comprises
And putting the oil saturated rock sample into a box body, injecting water with a threshold height into the box body, and keeping the box body at a preset temperature.
7. A device for measuring spontaneous imbibition oil displacement rate of a rock sample is characterized by comprising:
the device comprises a box body, a rock sample fixing device and a resistivity measuring device;
the resistivity measuring device comprises a resistivity measuring instrument which is connected with the saturated oil rock sample and is used for measuring the imbibition resistivity during imbibition.
8. The assay device according to claim 7,
the measuring device also comprises a liquid level monitoring device and a temperature control device;
the liquid level monitoring device comprises a liquid level detector and a liquid level supply device;
the temperature control device comprises a heater, a temperature collector and a constant temperature controller.
9. The assay device according to claim 7,
the rock sample fixing device comprises a fixing cylinder and a blocking sheet;
the fixed cylinder is used for fixing the rock sample, and preferably a rubber cylinder;
the blocking piece is located at one end of the rock sample and used for blocking oil production of the rock sample at the end, and a wet sandstone piece is preferred.
10. The assay device according to claim 7,
injecting water with a threshold height into the box body, and keeping the box body at a preset temperature;
and calculating the spontaneous imbibition displacement rate according to the volume, porosity, water saturation resistivity, oil saturation quality and imbibition resistivity of the rock sample.
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