CN114814159A - Detection device and method for core damage rate - Google Patents
Detection device and method for core damage rate Download PDFInfo
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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
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Abstract
The embodiment of the application provides a detection device and a detection method for a rock core damage rate. After the rock core is saturated with formation water in the liquid container, acquiring a first permeability of the rock core in the rock core holder through a gas measurement component; after the core is saturated with the fracturing fluid in the fluid container, the second permeability of the core is obtained again; and the processing chip calculates the damage rate of the rock core according to the first permeability and the second permeability. In the working process of the detection device for the rock core damage rate, the rock core does not need to be moved, the first permeability and the second permeability of the rock core can be directly detected through the gas measurement component, and the damage rate of the rock core is calculated according to the first permeability and the second permeability, so that the influence of the external environment on the permeability of the rock core can be effectively avoided, the permeability of the compact rock core can be accurately obtained, and the accuracy of the detection result of the rock core damage rate is improved.
Description
Technical Field
The application relates to the technical field of core detection, in particular to a device and a method for detecting core damage rate.
Background
In the process of exploiting an oil and gas well, a certain amount of fracturing fluid is usually injected into the well, so that high pressure formed by surface equipment is transmitted to an underground reservoir, original cracks of the stratum are expanded or expanded, new cracks are formed in the stratum, and meanwhile, a propping agent is brought into the cracks, so that the permeability of the underground reservoir is changed, oil and gas stored in the underground reservoir are exploited, and the yield of reservoir oil and gas exploitation is increased. Namely, the damage rate of the fracturing fluid to the rock core is an important factor related to the success or failure of fracturing construction and influencing the yield increasing effect after the construction.
In the prior art, when the damage rate of a fracturing fluid to a core is detected, the permeability of the core before being damaged by the fracturing fluid is detected through a permeability detection device. Damaging the rock core through fracturing fluid, moving the rock core into a permeability detection device, and detecting the permeability of the rock core after the rock core is damaged by the fracturing fluid; and calculating the damage rate of the fracturing fluid to the core according to the permeability of the core before being damaged by the fracturing fluid and the permeability of the core after being damaged by the fracturing fluid.
However, in the process of moving the core damaged by the fracturing fluid, the core may contact with an external environment, and the external environment may affect the permeability of the core, so that the accuracy of the detection result of the permeability of the core is low.
Disclosure of Invention
The embodiment of the application provides a detection device and a detection method for the rock core damage rate, so that a gas measurement component can directly detect the permeability of a rock core without moving the rock core, and the accuracy of the detection result of the rock core damage rate is improved.
In a first aspect, an embodiment of the present application provides a device for detecting a core damage rate, where the device for detecting a core damage rate includes: the device comprises a rock core holder for fixedly placing a rock core, a liquid container connected with the rock core holder, a gas measurement component connected with the liquid container, and a processing chip connected with the gas measurement component.
The gas measurement component is used for acquiring a first permeability of a rock core in the rock core holder after the rock core saturates formation water in the liquid container; and after the core saturates the fracturing fluid in the fluid container, obtaining the second permeability of the core in the core holder again.
And the processing chip is used for determining the damage rate of the fracturing fluid to the rock core according to the first permeability and the second permeability.
In one possible implementation manner, the liquid container includes a first liquid container and a second liquid container, the first liquid container is connected to the first end of the core holder, and the second liquid container is connected to the second end of the core holder.
In a possible implementation, the apparatus further comprises a first booster pump connected to the first liquid-holding vessel, and a second booster pump connected to the second liquid-holding vessel.
The first booster pump is used for boosting the liquid in the first liquid container so as to enable the core to saturate the liquid in the first liquid container.
And the second booster pump is used for boosting the liquid in the second liquid container so as to promote the rock core to saturate the liquid in the second liquid container.
In a possible implementation, the apparatus further comprises a first vacuum pump connected to the first liquid holding vessel, and a second vacuum pump connected to the second liquid holding vessel.
The first vacuum pump and the second vacuum pump are used for vacuumizing the rock core and the rock core holder after the rock core is saturated with the liquid in the liquid container.
In one possible implementation, the apparatus further includes a first buffer tank disposed between the first vacuum pump and the core holder, and a second buffer tank disposed between the second vacuum pump and the core holder.
The first buffer tank is used for preventing liquid in the core holder from entering the first vacuum pump when the first vacuum pump vacuumizes the core and the core holder.
And the second buffer tank is used for preventing liquid in the core holder from entering the second vacuum pump when the second vacuum pump vacuumizes the core and the core holder.
In one possible implementation, the apparatus further includes a pressure display coupled to the core holder.
The pressure display is used for displaying the pressure in the core holder, and the pressure is used for controlling the first vacuum pump and the second vacuum pump.
In one possible implementation, the gas measurement component includes a gas cylinder and a gas flow meter; the gas cylinder is connected with the first end of the core holder, and the gas flowmeter is connected with the second end of the core holder.
In one possible implementation, the apparatus further includes a confining pressure pump connected to a third end of the core holder.
And the confining pressure pump is used for adjusting the pressure in the core holder when the first permeability and the second permeability are detected.
In a second aspect, an embodiment of the present application provides a method for detecting a core damage rate, where the method includes:
and after the core saturates formation water, obtaining a first permeability of the core in the core holder.
And after the core is saturated with the fracturing fluid, obtaining the second permeability of the core in the core holder again.
And determining the damage rate of the fracturing fluid to the rock core according to the first permeability and the second permeability.
In one possible implementation manner, the determining the damage rate of the fracturing fluid to the core according to the first permeability and the second permeability includes:
determining a difference between the first permeability and the second permeability.
And determining the ratio of the difference to the first permeability as the damage rate of the fracturing fluid to the core.
In a third aspect, an embodiment of the present application further provides a device for detecting a core damage rate, where the device for detecting a core damage rate may include a memory and a processor; wherein the content of the first and second substances,
the memory is used for storing the computer program.
The processor is configured to read the computer program stored in the memory, and execute the method for detecting a core damage rate in any one of the possible implementation manners of the second aspect according to the computer program in the memory.
In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores computer-executable instructions, and when a processor executes the computer-executable instructions, the method for detecting a core damage rate in any one of the possible implementation manners of the second aspect is implemented.
In a fifth aspect, the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the method for detecting a core damage rate is implemented as described in any one of the possible implementation manners of the second aspect.
Therefore, the device and the method for detecting the damage rate of the core provided by the embodiment of the application comprise a core holder, a liquid container, a gas measurement component and a processing chip. After the rock core is saturated with formation water in the liquid container, acquiring a first permeability of the rock core in the rock core holder through a gas measurement component; after the core is saturated with the fracturing fluid in the fluid container, the second permeability of the core is obtained again; and the processing chip calculates the damage rate of the rock core according to the first permeability and the second permeability. In the working process of the detection device for the rock core damage rate, the rock core does not need to be moved, the first permeability and the second permeability of the rock core can be directly detected through the gas measurement component, and the damage rate of the rock core is calculated according to the first permeability and the second permeability, so that the influence of the external environment on the permeability of the rock core can be effectively avoided, and the accuracy of the detection result of the rock core damage rate is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural diagram of a core damage rate detection apparatus according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of another core damage rate detection device provided in an embodiment of the present application;
fig. 3 is a schematic flow chart of a method for detecting a core damage rate according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a core damage rate detection apparatus according to an embodiment of the present application.
With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In the description of the text of the present application, the character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The technical scheme provided by the embodiment of the application can be applied to a rock core detection scene. In the exploitation process of the oil and gas well, fracturing fluid can be injected into the well to prop open or enlarge the original crack of the underground reservoir, so that a new crack is generated, oil and gas in the underground reservoir can be fully exploited, and the yield of the oil and gas is improved. However, different fracturing fluids have different influences on fractures of the oil and gas well, so that rock cores of different oil and gas well reservoirs can be damaged through the fracturing fluids, and the influence of the fracturing fluids on the reservoirs in the well is determined according to the damage rate of the fracturing fluids on the rock cores, so that the influence of the fracturing fluids on the yield of the oil and gas well is estimated.
At present, when the damage rate of the fracturing fluid to the core is detected, the permeability of the core before being damaged by the fracturing fluid can be detected through a permeability detection device. And after the fracturing fluid damages the rock core, the rock core needs to be moved into a device for detecting the permeability, and the permeability of the rock core damaged by the fracturing fluid is detected. And calculating the damage rate of the fracturing fluid to the core according to the permeability of the core before being damaged by the fracturing fluid and the permeability of the core after being damaged by the fracturing fluid. However, when the permeability of the core damaged by the fracturing fluid is detected, the core damaged by the fracturing fluid needs to be moved into a permeability detection device, so that the detection result of the permeability of the core damaged by the fracturing fluid may be inaccurate due to the contact between the core and the external environment, and the accuracy of the detection result of the damage rate of the core is low.
In order to avoid the problem that the permeability of the core damaged by the fracturing fluid is inaccurate due to the fact that the core damaged by the fracturing fluid is contacted with the outside environment when the core is moved, the core holder for holding the core, the liquid container and the gas measurement component are connected with each other, so that the permeability of the core damaged by the fracturing fluid in the liquid container can be directly detected through the gas measurement component, the core does not need to be moved, and the influence of the outside environment on the permeability is avoided. In addition, the processing chip can be connected with the gas measurement component, so that the processing chip can receive the permeability of the rock core before being damaged by the fracturing fluid and the permeability after being damaged, and determine the damage rate of the fracturing fluid to the rock core.
Based on the above conception, the embodiment of the application provides a detection device for the core damage rate, and the detection device comprises a core holder for fixedly placing a core, a liquid container connected with the core holder, a gas measurement component connected with the liquid container, and a processing chip connected with the gas measurement component.
The gas measurement component is used for acquiring the first permeability of the rock core in the rock core holder after the rock core is saturated with formation water in the liquid container; and after the core is saturated with the fracturing fluid in the fluid container, obtaining the second permeability of the core in the core holder again. And the processing chip is used for determining the damage rate of the fracturing fluid to the rock core according to the first permeability and the second permeability.
It can be seen that the detection apparatus for the core damage rate provided by the embodiment of the application includes a core holder, a liquid container, a gas measurement component and a processing chip. After the core is saturated with water in the liquid container, acquiring a first permeability of the core in the core holder through a gas measurement component; after the core is saturated with the fracturing fluid in the fluid container, the second permeability of the core is obtained again; and the processing chip calculates the damage rate of the rock core according to the first permeability and the second permeability. In the working process of the detection device for the rock core damage rate, the rock core does not need to be moved, the first permeability and the second permeability of the rock core can be directly detected through the gas logging component, the damage rate of the rock core is calculated according to the first permeability and the second permeability, the influence of an external environment on the permeability of the rock core can be effectively avoided, and the accuracy of a detection result of the rock core damage rate is improved.
Hereinafter, the core damage rate detection apparatus provided in the present application will be described in detail by way of specific examples. It is to be understood that the following detailed description may be combined with other embodiments, and that the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic structural diagram of a core damage rate detection apparatus 10 according to an embodiment of the present disclosure, for example, please refer to fig. 1, where the core damage rate detection apparatus may include: the core holding device comprises a core holding device 101 used for fixedly holding a core, a liquid container 102 connected with the core holding device, a gas measurement component 103 connected with the liquid container, and a processing chip 104 connected with the gas measurement component.
The gas measurement component 103 is used for acquiring a first permeability of a core in the core holder 101 after the core is saturated with formation water in the liquid container 102; and after the core saturates the fracturing fluid in the fluid container 102, the second permeability of the core in the core holder 101 is again obtained.
For example, the core in the embodiment of the present application may be a dense core, and may also be other types of cores, which is not limited in any way.
And the processing chip 104 is used for determining the damage rate of the fracturing fluid to the rock core according to the first permeability and the second permeability.
For example, the formation water may be the formation water in the oil and gas well in which the core is located, or may be configured according to the content of each mineral ion analyzed by the formation water, which is not limited in this embodiment of the present application.
It can be understood that when the core is placed in the core holder, the core can be directly placed in the core holder, or the core can be loaded into a rubber cylinder filled with a hole, the rubber cylinder is placed in the core holder, or the core can be placed in the core holder in other manners.
It can be seen that the detection apparatus for core damage rate provided by the embodiment of the present application includes a core holder, a liquid container, a gas measurement unit and a processing chip. After the rock core is saturated with formation water in the liquid container, acquiring a first permeability of the rock core in the rock core holder through a gas measurement component; after the core is saturated with the fracturing fluid in the fluid container, the second permeability of the core is obtained again; and the processing chip calculates the damage rate of the rock core according to the first permeability and the second permeability. In the working process of the detection device for the rock core damage rate, the rock core does not need to be moved, the first permeability and the second permeability of the rock core can be directly detected through the gas measurement component, and the damage rate of the rock core is calculated according to the first permeability and the second permeability, so that the influence of the external environment on the permeability of the rock core can be effectively avoided, and the accuracy of the detection result of the rock core damage rate is improved.
The detection apparatus for detecting a core damage rate provided in the embodiment of the present application will be described in detail with specific components as examples, and specifically, refer to fig. 2, where fig. 2 is a schematic structural diagram of another detection apparatus for detecting a core damage rate provided in the embodiment of the present application.
The embodiment of the present application is described by way of example only, but not by way of limitation, in the case where a core is placed in a rubber cylinder, and the rubber cylinder is placed in a core holder for holding the core, as shown in fig. 2.
The liquid container among the detection device of rock core damage rate that this application embodiment provided includes first liquid container and second liquid container, and first liquid container is connected with the first end of core holder, and second liquid container is connected with the second end of core holder. Wherein the switch F2 on the first liquid container side and the switch F6 on the first end side of the core holder control the connection between the first liquid container and the first end of the core holder; a switch F13 on the second liquid container side and a switch F10 on the second end side of the core holder control the connection between the second liquid container and the second end of the core holder. The first liquid container and the second liquid container are respectively connected with two ends of the core holder, so that the two liquid containers can simultaneously inject liquid into the core holder, and the time of core saturated liquid in the core holder is shortened.
In addition, the device also comprises a first booster pump connected with the first liquid container and a second booster pump connected with the second liquid container. The first booster pump is used for boosting the liquid in the first liquid container so as to promote the rock core to saturate the liquid in the first liquid container; and the second booster pump is used for boosting the liquid in the second liquid container so as to promote the rock core to saturate the liquid in the second liquid container. The switch F3 can control the first booster pump to be connected with the first liquid container, and the switch F14 can control the second booster pump to be connected with the second liquid container. The liquid in the first liquid container and the liquid in the second liquid container can be fully pressed into the core holder through the first booster pump and the second booster pump, so that the core can fully saturate the liquid in the liquid containers.
Illustratively, the apparatus further comprises a first vacuum pump coupled to the first fluid-holding vessel, and a second vacuum pump coupled to the second fluid-holding vessel. The first vacuum pump and the second vacuum pump are used for vacuumizing the rock core and the rock core holder after the rock core is saturated with liquid in the liquid container. The first vacuum pump and the second vacuum pump can remove a small amount of gas remained in the core and the core holder, so that the core is fully saturated with liquid.
It is to be understood that the apparatus further includes a first surge tank disposed between the first vacuum pump and the core holder, and a second surge tank disposed between the second vacuum pump and the core holder. Wherein, the connection between the first buffer tank and the first vacuum pump and between the second buffer tank and the second vacuum pump are respectively controlled by a switch F5 and a switch F12. And the connection between the first buffer tank and the second buffer tank and the first end and the second end of the core holder are controlled by a switch F4 and a switch F11 respectively. In addition, the first buffer tank is used for preventing liquid in the core holder from entering the first vacuum pump when the first vacuum pump vacuumizes the core and the core holder; and the second buffer tank is used for preventing liquid in the core holder from entering the second vacuum pump when the second vacuum pump vacuumizes the core and the core holder. The first buffer tank and the second buffer tank can protect the interior of the first vacuum pump and the interior of the second vacuum pump from entering liquid.
Illustratively, the apparatus further includes a pressure display coupled to the core holder, the pressure display for displaying a pressure within the core holder, the pressure for controlling the first vacuum pump and the second vacuum pump. The connection between the two ends of the pressure sensor and the first and second ends of the core holder is controlled by a switch F7 and a switch F8. Through the pressure displayed by the pressure display, the process that the first vacuum pump and the second vacuum pump are used for vacuumizing the rock core and the rock core holder can be accurately controlled.
According to fig. 2, the gas measuring components in the device comprise a gas cylinder and a gas flow meter. The connection between the gas cylinder and the first end of the core holder is controlled through a switch F1 and a switch F6, and the connection between the gas flowmeter and the second end of the core holder is controlled through a switch F10 and a switch F15. The permeability of the rock core can be detected at any time by the gas measurement device without moving the rock core, so that the influence of the external environment on the rock core in the process of moving the rock core is avoided, and the accuracy of the detection result of the permeability of the rock core is improved.
Illustratively, the apparatus further includes a confining pressure pump coupled to a third end of the core holder. The confining pressure pump is used for adjusting the pressure in the core holder when detecting the first permeability and the second permeability. Wherein the connection between the confining pump and the third end of the core holder is controlled by a switch F9. Through the regulation of confining pressure pump to the pressure in the core holder for the gas in the gas cylinder can pass through the core holder, thereby detect the gas flow that the core holder flowed out through gas flowmeter.
As shown in fig. 2, in the core damage rate detection apparatus according to the embodiment of the present application, a switch F1, a switch F2, a switch F3, a switch F4, a switch F5, a switch F6, a switch F7, a switch F8, a switch F9, a switch F10, a switch F11, a switch F12, a switch F13, a switch F14, and a switch F15 are provided, so that the connection state between the respective components is controlled. The embodiment of the present application only takes the switch control connection state as an example for description, but the embodiment of the present application is not limited thereto, and the embodiment of the present application does not set any limitation on the type of the switch.
Therefore, according to the detection device for the damage rate of the core, which is provided by the embodiment of the application, after the core is saturated with formation water in the liquid container, the first permeability of the core in the core holder is obtained through the gas logging component; after the core is saturated with the fracturing fluid in the fluid container, the second permeability of the core is obtained again; and calculating the damage rate of the fracturing fluid-aged core of the core through the processing chip. In the working process of the detection device for the rock core damage rate, the rock core does not need to be moved, the first permeability and the second permeability of the rock core can be directly detected through the gas measurement component, the influence of the external environment on the permeability of the rock core is avoided, and the accuracy of the detection result of the rock core damage rate is improved.
In order to facilitate understanding of how to determine the damage rate of the fracturing fluid to the core without moving the core in the embodiment of the present application, the following embodiment will be used to describe in detail how to determine the damage rate of the fracturing fluid to the core without moving the core in the embodiment of the present application.
Fig. 3 is a schematic flow chart of a method for detecting a core damage rate according to an embodiment of the present disclosure. The method for detecting the core damage rate may be performed by software and/or a hardware device, for example, the hardware device may be the apparatus for detecting the core damage rate described in the above embodiments. For example, referring to fig. 3, the method for detecting the core damage rate may include:
s301, after the rock core is saturated with formation water, obtaining a first permeability of the rock core in the rock core holder.
For example, before the core saturates the formation water, the oil and brine in the core may be dissolved and extracted by distillation extraction, or the oil and brine in the core may be dissolved and extracted by other methods, and the specific method may be selected according to the type of the core, which is not limited in this application. When the oil in the rock core is dissolved and extracted by a distillation extraction method, the rock core can be put in a device with steam to thoroughly clean the oil, and the rock core can also be put in a pressure rock core cleaner filled with toluene-carbon dioxide to thoroughly clean the oil; or the core is put in a flow oil washing device for flow oil washing, and the embodiment of the application is not limited to any specific method. When the brine in the core is dissolved and extracted by the distillation extraction method, the core can be placed in a drying box to be dried so as to remove the brine in the core. In addition, the oil and brine in the core may also be dissolved and extracted with acetone and methanol solutions.
It will be appreciated that after dissolving and extracting the oil and brine from the core, the core may be placed in a rubber cylinder and the rubber cylinder placed in a core holder for securing. The embodiments of the present application are described by taking a rubber cylinder as an example, but the embodiments of the present application are not limited thereto.
In addition, the permeability of the dry core obtained after dissolving and extracting oil and brine can be detected by the device shown in fig. 2, so that the characteristics of the dry core can be further known. The method can comprise the following steps: gas, such as nitrogen, which can be used for detecting the permeability of the core is injected into the gas cylinder. And opening a switch F1, a switch F6, a switch F7, a switch F8 and a switch F10, keeping other switches closed, and enabling the gas in the gas cylinder to pass through the core holder and the gas flowmeter. Determining the pressure value at the inlet end and the pressure value at the outlet end of the rock core according to the pressure value in the rock core holder displayed by the pressure display, namely the displacement differential pressure of the rock core; and controlling the pressure value of the air bottle mouth to ensure that the displacement differential pressure of the rock core is within an allowable displacement differential pressure range. And opening a switch F9, and adjusting the confining pressure pump according to the displacement differential pressure of the core, so that the pressure value of the confining pressure pump is larger than the displacement differential pressure of the core, for example, the pressure value of the confining pressure pump can be 2MPa larger than the displacement differential pressure of the core. At the moment, the displacement is continued for about 8 hours, and the gas flow at the outlet end of the rock core is detected through a gas flowmeter.
The allowable displacement differential pressure range is calculated according to the length of the core and the displacement differential pressure gradient, for example, the displacement differential pressure gradient can be 0.3-0.7 MPa/cm, and in addition, the pressure value of the air bottle opening can also be calculated according to the displacement differential pressure gradient of the core. In an example, the displacement pressure difference of the core with the thickness of 0.5-1 mD is 0.3MPa/cm, the displacement pressure difference of the core with the thickness of 0.5-0.1 mD is 0.5MPa/cm, and the displacement pressure difference of the core with the thickness less than 0.1mD is 0.7 MPa/cm.
And after the pressure value at the inlet end of the rock core, the pressure value at the outlet end of the rock core and the gas flow at the outlet end of the rock core are obtained, all switches are closed, and the gas permeability, namely the permeability of the dry rock core, is calculated according to the Darcy formula. Wherein the Darcy formula is shown as the following formula (1):
in the above formula, k g Denotes permeability of the core, Q2 denotes gas flow at the exit end of the core, L denotes length of the core, a denotes cross-sectional area of the core, P 0 Denotes atmospheric pressure, P 1 Indicating the pressure value, P, at the inlet end of the core 2 The pressure value at the outlet end of the core is expressed and μ represents the gas viscosity at the experimental temperature and atmospheric pressure.
For example, when the first permeability of the core in the core holder is obtained after the core is saturated with formation water, the first liquid container and the second liquid container are filled with formation water, and the first buffer tank and the second buffer tank are filled with formation water of a certain volume, for example, 1/3-1/2 volumes of formation water are filled in the first buffer tank and the second buffer tank. At this time, the switch F2, the switch F3, the switch F6, the switch F7, the switch F8, the switch F10, the switch F13, and the switch F14 are opened, and the other switches are kept closed. And starting the first booster pump and the second booster pump, and keeping certain pump pressures of the first booster pump and the second booster pump unchanged, for example, keeping the pump pressures of the first booster pump and the second booster pump unchanged at 0.5MPa, so that the core holder is filled with formation water, namely the core can saturate the formation water. And when the pressure value displayed by the pressure display reaches a first preset value and is kept unchanged for a certain time, determining that the core holder is filled with formation water, and closing the first booster pump and the second booster pump. The size of the first preset value may be determined according to the type of the core, and the embodiment of the present application is not particularly limited.
It will be appreciated that when the first and second booster pumps are turned off, the switches that switch F2, switch F3, switch F13, and switch F14 are open may be closed so that formation water in the core holder cannot flow back into the first and second charge containers.
After it is determined that the core holder is filled with formation water, the switches F4, F5, F11 and F12 may be turned on, the first vacuum pump and the second vacuum pump may be turned on, and the pressure of the first vacuum pump and the second vacuum pump may be maintained below a certain value, for example, the pressure value of the first vacuum pump and the second vacuum pump may be maintained below 13.3 MPa. And vacuumizing the rock core in the rock core holder filled with formation water, wherein the duration time can be 8-13 hours, and the embodiment of the application does not limit the specific time. After the vacuuming process is completed, all switches are closed. In addition, after the vacuumizing treatment is finished, the switches F2, F3, F6, F7, F8, F10, F13 and F14 can be turned on again, and the first booster pump and the second booster pump are turned on, so that the core in the core holder can be fully saturated with formation water.
In the embodiment of the application, the core holder filled with the formation water is vacuumized, so that residual gas in the core holder can be removed, and the core can be fully saturated with the formation water. Particularly for the compact rock core, formation water can successfully enter the rock core through a vacuumizing and pressurizing saturation method, so that the permeability of the compact rock core can be accurately detected.
Further, a first permeability of the core in the core holder is obtained after the core saturates formation water. The method for obtaining the first permeability of the core in the core holder is the same as the method for obtaining the permeability of the dry core, and details are not repeated in the embodiments of the present application.
In the embodiment of the application, after the rock core is saturated with formation water, the first permeability of the rock core can be directly obtained through the gas logging component, so that the operation process for obtaining the first permeability of the rock core is simpler, the time required for detection is saved, and the problem that the external environment influences the rock core due to movement of the rock core is avoided.
And S302, after the rock core is saturated with the fracturing fluid, obtaining the second permeability of the rock core in the rock core holder again.
For example, before the second permeability of the core in the core holder is obtained, the core needs to be saturated with the fracturing fluid, and the first buffer tank and the second buffer tank can be filled with a certain volume of the fracturing fluid by filling the first liquid container and the second liquid container with the fracturing fluid, for example, 1/3-1/2 volumes of the fracturing fluid are filled in the first buffer tank and the second buffer tank. And by starting the first booster pump and the second booster pump, the fracturing fluid is injected into the core holder, and the core holder is determined to be filled with the fracturing fluid, so that the core can be saturated with the fracturing fluid. The method for saturating the fracturing fluid in the rock core is the same as the method for saturating the stratum with water in the rock core, and details are not repeated in the embodiment of the application.
In addition, the core holder filled with the fracturing fluid is vacuumized, and residual gas in the core holder is discharged, so that the core can be fully saturated with the fracturing fluid. The process can be referred to the vacuum pumping process of the core holder filled with formation water, and the process is not described in detail in the embodiment of the application.
It is understood that the fracturing fluid may be a crosslinked fracturing fluid, a non-crosslinked fluid, slickwater, or other fracturing fluid, and the embodiments of the present application are not limited to any particular fracturing fluid.
In the embodiment of the application, by the method of vacuumizing and pressurizing saturation, the fracturing fluid can fully enter the rock core, namely, the fracturing fluid can be fully saturated in the compact rock core which is difficult to enter, so that the accuracy of detecting the damage rate of the fracturing fluid to the rock core is improved.
Further, after the core is saturated with the fracturing fluid, a second permeability of the core in the core holder is again obtained. The second permeability of the core can be obtained by the method for obtaining the permeability of the dry core, which is not described in detail in the embodiment of the present application. When the second permeability of the core is obtained, the pressure value of the first vacuum pump is different from the pressure value of the permeability of the dry core, for example, the pressure values of the first vacuum pump and the second vacuum pump may be between 13.8 MPa and 20.7MPa, and the specific pressure value is not limited in this embodiment.
In this application embodiment, behind rock core saturated fracturing fluid, can directly acquire the second permeability of rock core through the gas logging part for the operation process of obtaining rock core second permeability is simpler, has saved and has detected required time, has avoided removing the rock core and has leaded to the problem that external environment caused the influence to the rock core simultaneously.
And S303, determining the damage rate of the fracturing fluid to the rock core according to the first permeability and the second permeability.
For example, in determining the damage rate of the fracturing fluid to the core, the first permeability may be determined by determining a difference between the first permeability and the second permeability; and determining the ratio of the difference to the first permeability as the damage rate of the fracturing fluid to the core, namely the damage rate of the fracturing fluid to the core. Assume the first permeability of the core is k 1 Second permeability of the core is k 2 Then can be represented by the formula (k) 1 -k 2 )/k 1 And multiplying by 100 percent, and determining the damage rate of the fracturing fluid to the core.
In the embodiment of the application, the damage rate of different fracturing fluids to the same type of rock core can be obtained, the fracturing fluids are selected according to the damage rate of the rock core, and the optimal fracturing fluid is used for exploiting the oil-gas well where the rock core is located, so that the yield of the oil-gas well is increased.
Therefore, according to the method for detecting the core damage rate provided by the embodiment of the application, the first permeability of the core in the core holder of the saturated formation water and the second permeability of the core in the core holder of the saturated fracturing fluid are obtained; and determining the damage rate of the fracturing fluid to the rock core according to the first permeability and the second permeability, so that the damage rate of the fracturing fluid to the rock core can be determined accurately.
In order to facilitate understanding of the method for detecting the core damage rate provided by the embodiment of the present application, a core of a certain a block a-1 well of a fractured compact sandstone reservoir of a Tarim oil field is taken as an example, and the technical scheme provided by the embodiment of the present application is described in detail below. The reservoir of a certain A block A-1 well of the Tarim oil field fractured compact sandstone reservoir is a condensate gas reservoir.
In an example, 6 cores in a certain A block A-1 well of a Tarim oil field fractured compact sandstone reservoir are selected, wherein the cores are No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6 respectively, and the corresponding lengths of the cores are 5.1cm, 4.8cm, 5.3cm, 5.4cm, 4.9cm and 5.2cm respectively. The cores were subjected to dissolution and extraction of oil and brine from the cores, respectively, according to the methods in the examples above, and the permeability of the dry cores was obtained. Wherein, the permeability of 6 dry cores is 0.25mD, 0.48mD, 0.35mD, 0.40mD, 0.28mD and 0.32mD respectively.
After the permeability of the dry rock core is obtained, the first liquid container and the second liquid container can be filled with the formation water of the well, and the first buffer tank and the second buffer tank are filled with the formation water in the well with the volume of 1/3-1/2. Wherein, the formation water of the well is equivalent to calcium chloride water with the density of 1.15 and the total mineralization of 221000 mg/L.
It can be understood that, because the permeability of the 6 cores is between 0.5 and 0.1mD, the pressure gradient can be 0.5MPa/cm, and the pressure of the confining pressure pump can be 5 MPa. After the 6 cores are all displaced for 9 hours, the permeabilities of the cores No. 1, No. 2, No. 3 and No. 4 are respectively measured to be 0.0089mD, 0.0125mD, 0.0098mD and 0.0114mD, namely the first permeabilities of the cores No. 1, No. 2, No. 3 and No. 4 are respectively 0.0089mD, 0.0125mD, 0.0098mD and 0.0114 mD. Wherein, 6 rock cores are vacuumized for 12 hours under the pressure value of 12MPa of the two booster pumps, and for example, the process of saturating formation water for 8 hours can be continued to the rock cores under the pressure value of 15MPa of the two booster pumps. According to the measuring method of the split method, the No. 5 core and the No. 6 core are split from the middle along the length direction respectively, and copper sheets, steel wires and the like are padded in the split core, in the embodiment of the application, the copper sheets with the thickness of 0.03mm and the width of 1.5mm are padded on two sides of the split seam of the core, when the pressure of a confining pressure pump is 15MPa, standing is carried out for 12 hours, and then the corresponding permeability rates are respectively 35.24mD and 23.45mD, namely the first permeability rates of the No. 5 core and the No. 6 core are respectively 35.24mD and 23.45 mD.
According to the method, the switch, the first booster pump and the second booster pump are started, the saturated formation water treatment is carried out on the cores No. 1 and No. 4 for 12 hours under the condition that the pressure values of the two booster pumps are 12MPa, so that the core holder is filled with the fracturing fluid, and the cores can be fully saturated with the fracturing fluid. And vacuumizing the No. 1 and No. 4 rock cores for 12 hours under the pressure value of 12MPa of the two booster pumps, for example, the process of saturating the fracturing fluid for 8 hours on the No. 1 and No. 4 rock cores can be continued under the pressure value of 15MPa of the two booster pumps. Wherein the clear liquid of the gel breaking liquid of the guar gum fracturing fluid can be obtained by mixing 0.36 percent of super guar gum, 20 percent of KCl + and 1.0 percent of a cleanup additive, 0.5 percent of a temperature stabilizer, 0.1 percent of a bactericide and 0.2 percent of a crosslinking regulator, the crosslinking ratio is 100:0.8, and the concentration of the gel breaker is 250 ppm.
In addition, according to the method for measuring the damage rate of the matrix permeability of the rock core, no liquid is discharged from the rock core displacement guar gum fracturing fluid breaking liquid clear liquid of No. 2 and No. 3 under the pressure difference of 2.5MPa for 24 hours, and the experiment is suspended, namely, the method for measuring the damage rate of the matrix permeability of the rock core cannot obtain the permeability of the rock core. And (3) for the No. 5 and No. 6 split joint rock cores to displace the gel breaking liquid clear liquid of the guar gum fracturing fluid, continuously displacing for 5 minutes after the outlet end discharges the liquid, and stopping, and obtaining the permeability of the No. 5 and No. 6 rock cores after the guar gum fracturing fluid clear liquid is injected.
Further, according to the method described in the above embodiment, the second permeabilities of the cores No. 1, No. 4, No. 5, and No. 6 are obtained, and when the pressure gradient is 0.5MPa/cm and the pressure value of the confining pressure pump is 5MPa, the cores No. 1 and No. 4 are displaced for 9 hours, so that the second permeabilities of the cores No. 1 and No. 4 are 0.0069mD and 0.0091mD, and the second permeabilities of the cores No. 5 and No. 6 are 33.21mD and 19.85mD, respectively.
And calculating the damage rate of the gel breaking liquid of the guar gum fracturing fluid to the core through a Darcy formula according to the obtained first permeability and the second permeability of the core. Wherein, the damage rates of the No. 1 core and the No. 4 core are respectively 22.5 percent and 20.2 percent; treating according to a split seam method to obtain 5 # and 6 # rock cores with damage rates of 5.8% and 15.4% respectively; and the damage rate of the core cannot be determined by a core matrix permeability damage rate measuring method.
According to the obtained damage rate of the core, the detection method of the damage rate of the core provided by the embodiment of the application can enable the fracturing fluid to fully damage the core, so that the determined result of the damage rate of the core is more accurate.
The detection apparatus for rock core damage rate that this application embodiment provided, in the detection apparatus's of rock core damage rate working process, need not remove the rock core, directly can detect the first permeability and the second permeability of rock core through the gas logging part, avoided the influence of external environment to the rock core permeability. In addition, the method provided by the application can be used for successfully saturating the formation water and the fracturing fluid into the compact rock core through the vacuumizing and pressurizing method, so that the accuracy of the detection result of the rock core damage rate is improved.
Fig. 4 is a schematic structural diagram of another core damage rate detection apparatus 40 according to an embodiment of the present disclosure, for example, referring to fig. 4, the core damage rate detection apparatus 40 may include a processor 401 and a memory 402; wherein the content of the first and second substances,
the memory 402 is used for storing computer programs.
The processor 401 is configured to read the computer program stored in the memory 402, and execute the technical solution of the core damage rate detection method in any of the embodiments according to the computer program in the memory 402.
Alternatively, the memory 402 may be separate or integrated with the processor 401. When the memory 402 is a device independent from the processor 401, the core damage rate detection apparatus 40 may further include: a bus for connecting the memory 402 and the processor 401.
Optionally, this embodiment further includes: a communication interface that may be connected to the processor 401 through a bus. The processor 401 may control the communication interface to implement the functions of receiving and transmitting the core impairment rate detection apparatus 40 described above.
The detection apparatus 40 for the core damage rate shown in the embodiment of the present application may execute the technical scheme of the detection method for the core damage rate in any embodiment, and its implementation principle and beneficial effect are similar to those of the detection method for the core damage rate, and reference may be made to the implementation principle and beneficial effect of the detection method for the core damage rate, which is not described herein again.
An embodiment of the present application further provides a computer-readable storage medium, where a computer execution instruction is stored in the computer-readable storage medium, and when a processor executes the computer execution instruction, the technical solution for implementing the method for detecting a core damage rate in any of the above embodiments is implemented, and an implementation principle and beneficial effects of the method for detecting a core damage rate are similar to those of the method for detecting a core damage rate, which can be referred to as the implementation principle and beneficial effects of the method for detecting a core damage rate, and are not described herein again.
The embodiment of the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the technical scheme of the method for detecting a core damage rate in any of the above embodiments is implemented, and the implementation principle and the beneficial effect of the method for detecting a core damage rate are similar to those of the method for detecting a core damage rate, which can be referred to as the implementation principle and the beneficial effect of the method for detecting a core damage rate, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts shown as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) or a processor (in english: processor) to execute some steps of the methods according to the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The computer-readable storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A detection device for rock core damage rate is characterized by comprising: the core holder is used for fixedly placing a core, the liquid container is connected with the core holder, the gas measurement component is connected with the liquid container, and the processing chip is connected with the gas measurement component;
the gas measurement component is used for acquiring a first permeability of a rock core in the rock core holder after the rock core saturates formation water in the liquid container; after the core saturates the fracturing fluid in the fluid container, the second permeability of the core in the core holder is obtained again;
and the processing chip is used for determining the damage rate of the fracturing fluid to the rock core according to the first permeability and the second permeability.
2. The apparatus as recited in claim 1, wherein the fluid container comprises a first fluid container and a second fluid container, the first fluid container coupled to a first end of the core holder, the second fluid container coupled to a second end of the core holder.
3. The apparatus of claim 2, further comprising a first booster pump connected to said first liquid holding vessel, and a second booster pump connected to said second liquid holding vessel;
the first booster pump is used for boosting the liquid in the first liquid container so as to promote the core to saturate the liquid in the first liquid container;
and the second booster pump is used for boosting the liquid in the second liquid container so as to promote the rock core to saturate the liquid in the second liquid container.
4. The apparatus of claim 2, further comprising a first vacuum pump connected to the first liquid holding vessel, and a second vacuum pump connected to the second liquid holding vessel;
the first vacuum pump and the second vacuum pump are used for vacuumizing the rock core and the rock core holder after the rock core is saturated with the liquid in the liquid container.
5. The apparatus as recited in claim 4, further comprising a first surge tank disposed between the first vacuum pump and the core holder, and a second surge tank disposed between the second vacuum pump and the core holder;
the first buffer tank is used for preventing liquid in the core holder from entering the first vacuum pump when the first vacuum pump vacuumizes the core and the core holder;
and the second buffer tank is used for preventing liquid in the core holder from entering the second vacuum pump when the second vacuum pump vacuumizes the core and the core holder.
6. The apparatus as recited in claim 4, further comprising a pressure display coupled to the core holder;
the pressure display is used for displaying the pressure in the core holder, and the pressure is used for controlling the first vacuum pump and the second vacuum pump.
7. The apparatus of any one of claims 1-3, wherein the gas-measuring component comprises a gas cylinder and a gas flow meter; the gas cylinder is connected with the first end of the core holder, and the gas flowmeter is connected with the second end of the core holder.
8. The apparatus of any of claims 1-3, further comprising a confining pressure pump connected to a third end of the core holder;
and the confining pressure pump is used for adjusting the pressure in the core holder when the first permeability and the second permeability are detected.
9. A core damage rate detection method applied to the core damage rate detection device according to any one of claims 1 to 8, the method comprising:
after the rock core is saturated with formation water, obtaining a first permeability of the rock core in the rock core holder;
after the core is saturated with the fracturing fluid, obtaining the second permeability of the core in the core holder again;
and determining the damage rate of the fracturing fluid to the rock core according to the first permeability and the second permeability.
10. The method of claim 9, wherein determining the damage rate of the fracturing fluid to the core based on the first permeability and the second permeability comprises:
determining a difference between the first permeability and the second permeability;
and determining the ratio of the difference to the first permeability as the damage rate of the fracturing fluid to the core.
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