CN109085112A - Method and device for measuring permeability of compact rock sample - Google Patents
Method and device for measuring permeability of compact rock sample Download PDFInfo
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Abstract
The application discloses a method and a device for measuring permeability of a compact rock sample, and belongs to the technical field of oil-gas exploration and development. The method comprises the following steps: obtaining an upstream pressure pinUpstream pressure pinThe pressure at the inlet end of the core holder is referred to; taking a downstream pressure ptCorresponding to the time t, wherein the downstream pressure ptRefers to the pressure of the downstream gas container at time t; according to downstream pressure ptCalculating real-time pseudo pressureAccording to real-time pseudo-pressureCalculating the real-time permeability k (t); calculating according to the real-time permeability k (t)Average permeability k over the experimental time period T. The variable measuring method and the variable measuring device have the advantages that only one variable obtained through measurement is provided, so that the data processing process is simple, and the time consumption is shorter.
Description
Technical Field
The application relates to the technical field of oil and gas exploration and development, in particular to a permeability determination method and device for a compact rock sample.
Background
Permeability is one of the key parameters required for reservoir evaluation, capacity calculation and formulation of reasonable development schemes for oil and gas reservoirs. Accurate permeability parameters of the bottom rock are obtained, and the method plays a vital guiding role in formulating an oil and gas exploration and development scheme.
Methods for measuring permeability of tight rock samples can be classified into steady-state methods and unsteady-state methods. The steady-state method is a method for measuring the permeability of the compact rock sample commonly used in a laboratory at present, and is a representative Darcy steady flow method. A typical pulse attenuation method in the unsteady state method adopts a pressure sensor to record pressure change and further calculate the permeability of the rock sample.
By adopting the method for measuring the permeability of the compact rock sample in the related technology, the subsequent data processing process is complex and the time consumption is long.
Disclosure of Invention
The application provides a method and a device for measuring permeability of a compact rock sample, which can be used for solving the problems that the existing data processing process is complex and the time consumption is long when the permeability of the compact rock sample is measured in the prior art. The technical scheme is as follows:
in a first aspect, there is provided a method for determining permeability of a tight rock sample, the method comprising:
obtaining an upstream pressure pinSaid upstream pressure pinThe pressure at the inlet end of the core holder is referred to;
taking a downstream pressure ptAnd time t, wherein the downstream pressure ptRefers to the pressure of the downstream gas container at time t;
according to said downstream pressure ptThe real-time pseudo pressure is calculated using the following formula
Wherein, the p is0Represents a reference pressure; the mug(pt) Representing said downstream pressure ptAnd the ambient temperature T0The corresponding gas viscosity; the Z (p)t) Representing said downstream pressure ptAnd the ambient temperature T0A corresponding natural gas deviation factor;
the real-time permeability k (t) was calculated using the following formula:
wherein, theRepresenting an initial pseudo pressure; said C isgRepresenting the gas compression factor at time t; the V isdRepresents the volume of the downstream gas container; the L represents the length of the compact rock sample in the core holder; the r represents the radius of the compact rock sample in the core holder;
the average permeability k over the experimental time period T was calculated using the following formula:
where ξ represents the time interval between two adjacent test points, tmTime, t, representing the m test pointmξ m, said m being greater than 0And is not more than
Optionally, the method further comprises:
calculating the initial pseudo-pressure using the following formula
Wherein, the p isiRepresenting the initial pressure, from said upstream pressure pinThe same; said p isjDenotes a pressure range of p0To piThe jth pressure of the n pressures; the mug(pj) Representing said downstream pressure pjAnd the ambient temperature T0The corresponding gas viscosity; the Z (p)j) Indicating the downstream pressure pjAnd the ambient temperature T0And corresponding natural gas deviation factors, wherein n is a positive integer, and j is a positive integer less than or equal to n.
Optionally, the method further comprises:
calculating the gas compression coefficient C at time t using the following formulag：
In a second aspect, there is provided an apparatus for permeability measurement of a tight rock sample, the apparatus comprising:
an upstream pressure acquisition module for acquiring an upstream pressure pinSaid upstream pressure pinThe pressure at the inlet end of the core holder is referred to;
downstream pressureA force acquisition module for acquiring the downstream pressure ptAnd time t, wherein the downstream pressure ptRefers to the pressure of the downstream gas container at time t;
a real-time pseudo-pressure calculation module for calculating the downstream pressure ptThe real-time pseudo pressure is calculated using the following formula
Wherein, the p is0Represents a reference pressure; the mug(pt) Representing said downstream pressure ptAnd the ambient temperature T0The corresponding gas viscosity; the Z (p)t) Representing said downstream pressure ptAnd the ambient temperature T0A corresponding natural gas deviation factor;
a real-time permeability calculation module for calculating a real-time permeability k (t) using the formula:
wherein, theRepresenting an initial pseudo pressure; said C isgRepresenting the gas compression factor at time t; the V isdRepresents the volume of the downstream gas container; the L represents the length of the compact rock sample in the core holder; the r represents the radius of the compact rock sample in the core holder;
an average permeability calculation module for calculating an average permeability k over the experiment duration T using the following formula:
where ξ represents the time interval between two adjacent test points, tmTime, t, representing the m test pointmξ m, where m is greater than 0 and not more than
Optionally, the apparatus further comprises:
an initial pseudo-pressure calculation module for calculating the initial pseudo-pressure using the following formula
Wherein, the p isiRepresenting the initial pressure, from said upstream pressure pinThe same; said p isjDenotes a pressure range of p0To piThe jth pressure of the n pressures; the mug(pj) Representing said downstream pressure pjAnd the ambient temperature T0The corresponding gas viscosity; the Z (p)j) Indicating the downstream pressure pjAnd the ambient temperature T0And corresponding natural gas deviation factors, wherein n is a positive integer, and j is a positive integer less than or equal to n.
Optionally, the apparatus further comprises:
a gas compression coefficient calculation module for calculating the gas compression coefficient C at time t using the following formulag：
In a third aspect, there is provided a permeability measurement apparatus for a tight rock sample, comprising: the device comprises an air source container, a first valve, a first pressure regulating valve, an upstream air container, a second valve, a second pressure regulating valve, a pressure gauge, a third valve, a rock core holder for placing a compact rock sample, a confining pressure pump, a downstream air container, a pressure sensor and a fourth valve; wherein,
the outlet end of the air source container is connected with the inlet end of the first pressure regulating valve; the first valve is used for controlling the communication or the separation between the outlet end of the air source container and the inlet end of the first pressure regulating valve;
the outlet end of the first pressure regulating valve is connected with the inlet end of the second pressure regulating valve, the upstream gas container is arranged on a first passage between the outlet end of the first pressure regulating valve and the inlet end of the second pressure regulating valve, and the outlet end of the upstream gas container is connected with the first passage; the second valve is used for controlling the communication or the separation between the outlet end of the upstream gas container and the inlet end of the second pressure regulating valve;
the outlet end of the second pressure regulating valve is connected with the inlet end of the core holder, and the pressure gauge is arranged on a second passage between the outlet end of the second pressure regulating valve and the inlet end of the core holder; the third valve is used for controlling the communication or the isolation of the second passage;
the outlet end of the core holder is connected with the inlet end of the downstream gas container; the pressure sensor is for measuring a downstream pressure in the downstream gas vessel; the fourth valve is used for controlling the discharge of the gas in the downstream gas container;
and the confining pressure pump is used for providing confining pressure for the compact rock sample in the rock core holder.
The beneficial effects brought by the technical scheme provided by the embodiment of the application can include:
the relation between the downstream pressure and the time is obtained through experimental measurement, the real-time pseudo pressure is calculated, the real-time permeability is further calculated, and therefore the average permeability is obtained. Because only one variable is obtained by measurement, the data processing process is simple and the time consumption is shorter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a permeability measuring apparatus for a tight rock sample according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a permeability measurement method for a tight rock sample provided in one embodiment of the present application;
FIG. 3 is a schematic diagram illustrating an exemplary set of downstream pressure versus time;
fig. 4 is a block diagram of a permeability measuring apparatus for a tight rock sample according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a permeability measuring apparatus for a tight rock sample according to an embodiment of the present application is shown, where the permeability measuring apparatus for a tight rock sample may include: the device comprises an air source container 1, a first valve 2, a first pressure regulating valve 3, an upstream air container 4, a second valve 5, a second pressure regulating valve 6, a pressure gauge 7, a third valve 8, a core holder 9 for placing a compact rock sample, a confining pressure pump 10, a downstream air container 11, a pressure sensor 12 and a fourth valve 13.
As shown in fig. 1, the outlet end of the gas source container 1 is connected with the inlet end of the first pressure regulating valve 2; the first valve 2 is used for controlling the communication or the separation between the outlet end of the air source container 1 and the inlet end of the first pressure regulating valve 2. The gas source in the gas source container may be nitrogen.
The outlet end of the first pressure regulating valve 3 is connected with the inlet end of the second pressure regulating valve 6, an upstream gas container 4 is arranged on a first passage between the outlet end of the first pressure regulating valve 3 and the inlet end of the second pressure regulating valve 6, and the outlet end of the upstream gas container 4 is connected with the first passage; the second valve 5 is used to control the communication or the blocking between the outlet end of the upstream gas container 4 and the inlet end of the second pressure regulating valve 6.
The core holder 9 is used for placing the tight rock sample to be measured.
The outlet end of the second pressure regulating valve 6 is connected with the inlet end of the core holder 9, and a pressure gauge 7 is arranged on a second passage between the outlet end of the second pressure regulating valve 6 and the inlet end of the core holder 9; and the third valve 8 is used for controlling the communication or the isolation of the second passage.
The outlet end of the core holder 9 is connected with the inlet end of a downstream gas container 11; the pressure sensor 12 is used to measure the downstream pressure in the downstream gas container 11; the fourth valve 13 is used to control the discharge of gas from the downstream gas container.
The confining pressure pump 10 is used for providing certain confining pressure for the compact rock sample in the core holder 9. The confining pressure pump 10 may be a confining pressure hydraulic pump, typically a hydraulic pump using water to select distilled water.
Optionally, the permeability measuring apparatus for a tight rock sample provided in the embodiment of the present application further includes a timer, so as to record the downstream pressure change with respect to time.
Optionally, the permeability determination apparatus for a tight rock sample provided in the embodiment of the present application further includes a temperature measurement instrument for measuring an ambient temperature. Wherein the thermometric instrument may be a thermometer.
In a possible embodiment, the first valve 2, the second valve 5, the third valve 8 and the fourth valve 13 can adopt manual valves which are manually controlled, and the opening and the closing of each valve are manually controlled, so that the cost of the device can be saved.
In another possible embodiment, in order to realize automatic measurement, the first valve 2, the second valve 5, the third valve 8 and the fourth valve 13 may be pneumatic valves controlled by a program, and the automatic measurement may be realized by controlling the opening and closing of each valve by the program.
In addition, the permeability measuring device for the compact rock sample can adopt a manual recording method to measure the obtained data; the pressure gauge 7, the pressure sensor 12 and the timer may be connected to a computing device, respectively. The computing device is typically a computer, which may be a desktop computer, or a laptop portable computer. And the computing equipment is used for acquiring data recorded by the pressure gauge 7, the pressure sensor 12 and the timer and computing the permeability of the tight rock sample according to the acquired data.
In the technical solution provided in the embodiment of the present application, the permeability of the tight rock sample can be measured by the permeability measuring apparatus for the tight rock sample shown in fig. 1, and the permeability measuring apparatus may include the following operation steps:
(1) and placing the compact rock sample in a rock core holder 9, closing the first valve 2, the second valve 5, the third valve 8 and the fourth valve 13, and applying a certain confining pressure to the periphery of the compact rock sample in the rock core holder 9 through a confining pressure pump 10.
(2) The first valve 2 is opened to open the gas source container 1, and the first pressure regulating valve 3 is regulated to ensure that the output pressure of the gas source container 1 is pinFurther, the pressure of the upstream gas container 4 is maintained at pin。
(3) Opening the second valveA door 5 for adjusting the second pressure regulating valve 6 to make the reading on the pressure gauge 7 stable as pin。
(4) Opening the third valve 8 to allow the gas in the gas source container 1 to enter the downstream gas container 11 through the rock sample in the core holder 9, and recording the downstream pressure value p of the pressure sensor 12 at preset time intervalstThe predetermined time interval may be set manually in relation to the time t.
(5) And (5) when the value of the pressure sensor 12 tends to be stable, ending the experiment, closing the first valve 2, and opening the fourth valve 13 to be emptied.
(6) After the pressure in the whole measuring device is emptied, the confining pressure of the confining pressure pump is reduced to 0, and the compact rock sample in the rock core holder 9 is taken out for subsequent data processing.
Please refer to fig. 2, which shows a flow chart of a permeability determination method for a tight rock sample according to an embodiment of the present application. After the permeability measuring device shown in fig. 1 is adopted and the relevant measured data is collected by combining the operation steps described above, the method provided by this embodiment can be adopted to calculate the measured data, so as to obtain the permeability of the tight rock sample. In addition, in the method provided by the embodiment, the execution subject of each step may be the above-described computing device. The method may comprise the steps of:
step 201, obtaining an upstream pressure pinThe upstream pressure pinRefers to the pressure at the inlet end of the core holder.
Step 202, obtaining a downstream pressure ptAnd time t, wherein the downstream pressure ptIs the pressure of the downstream gas container at time t, the downstream pressure ptOver the course of the experiment, t varies.
Step 203, according to the downstream pressure ptThe real-time pseudo pressure is calculated using the following formula
Wherein p is0Denotes a reference pressure, in the present embodiment, the reference pressure p0May be a reference pressure value preset manually; mu.sg(pt) Represents the above downstream pressure ptAnd the ambient temperature T0Corresponding gas viscosity, the gas viscosity mug(pt) The information can be obtained through table lookup; z (p)t) Represents the above downstream pressure ptAnd the above-mentioned ambient temperature T0Corresponding natural gas deviation factor, the natural gas deviation factor Z (p)t) The method can be known through a table look-up method, and can also be obtained through calculation by adopting an eleven-parameter method.
Step 204, calculating the real-time permeability k (t) using the following formula:
wherein,representing an initial pseudo pressure; optionally, the initial pseudo pressureCalculated using the following formula:
wherein p isiRepresenting the initial pressure, with the upstream pressure pinThe same; p is a radical ofjDenotes a pressure range of p0To piThe jth pressure of the n pressures; mu.sg(pj) Indicating the downstream pressure pjAnd the ambient temperature T0Corresponding gas viscosity；Z(pj) Indicating the downstream pressure pjAnd the ambient temperature T0And the corresponding natural gas deviation factor, n is a positive integer, and j is a positive integer less than or equal to n.
CgRepresenting the gas compression factor at time t; alternatively, the gas compression coefficient C at the time tgCalculated using the following formula:
Vdrepresents the volume of the downstream gas container; l represents the length of the core in the core holder; r represents the radius of the tight rock sample in the core holder.
Step 205, calculate the average permeability k over the experimental time period T using the following formula:
where xi represents the time interval between two adjacent test points, tmTime, t, representing the m test pointmξ m, m is greater than 0 and not greater thanIn the embodiment of the present application, the starting test point is recorded as the 0 th test point.
In the following, the technical solutions provided in the present application are introduced and explained in detail by taking one practical application of the present application as an example:
taking a certain dense rock sample as an example, the dense rock sample has a diameter of 2.536cm and a length of 4.830 cm. The permeability of the compact rock sample is measured by a conventional steady state method in the current national standard GB/T29172-2012 core analysis method, wherein the permeability values at the inlet pressures of 0.44MPa, 0.95MPa and 1.04MPa are respectively 0.188mD, 0.163mD and 0.148mD, the average permeability is 0.166mD, and then the Ke's permeability is obtained by a regression method to be 0.125 mD.
To verify the correctness of the method of the present application, the following experiment was performed on the tight rock sample. In the experiments described below, the steady upstream pressure of the tight rock sample was set at 1.02MPa, and the pressure values at the downstream pressure at different time points were recorded according to the procedure provided in the above example, as shown in fig. 3. In addition, the volume of the downstream gas container in this experiment was 30 ml.
Accordingly, the initial pseudo-pressure, the real-time pseudo-pressure, and the real-time permeability were calculated using the calculation steps in the permeability measurement method described herein with reference to the example of fig. 2, as shown in table-1.
TABLE-1
From table-1, it is understood that the real-time permeability obtained by the permeability measurement method for a tight rock sample according to the present invention ranges from 0.121mD to 0.129mD, and further, the average permeability is 0.124 mD.
And performing error calculation on the average permeability obtained by the method and the average permeability obtained by a conventional steady state method in the national standard GB/T29172-2012 core analysis method to obtain a percentage error value of 0.8% and less than 5%, so as to meet the accuracy requirement, and proving that the permeability determination method of the compact rock sample conforms to the measurement result of the conventional steady state method.
In addition, as can be seen from table-1, with the method of the present application, the experimental time length is only 135s, which is shorter than the conventional steady-state method measurement time length of 1200 s.
In summary, in the permeability determination method for the compact rock sample provided in this embodiment, the relationship between the downstream pressure and the time is obtained through experimental measurement, the real-time pseudo pressure is calculated, and the real-time permeability is further calculated, so as to obtain the average permeability. Because only one variable is obtained by measurement, the data processing process is simple and the time consumption is shorter.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present disclosure, reference is made to the embodiments of the method of the present disclosure.
Referring to fig. 4, a block diagram of a permeability measuring apparatus for a tight rock sample according to an embodiment of the present application is shown. The device has the functions of realizing the method examples, and the functions can be realized by hardware or by hardware executing corresponding software. For example, the apparatus may be the computing device described above, or may be provided in a computing device. The apparatus may include: an upstream pressure acquisition module 401, a downstream pressure acquisition module 402, a real-time pseudo-pressure calculation module 403, a real-time permeability calculation module 404, and an average permeability calculation module 405.
An upstream pressure acquisition module 401 for acquiring an upstream pressure pinAnd the upstream pressure pin refers to the pressure at the inlet end of the core holder.
A downstream pressure acquisition module 402 for acquiring a downstream pressure ptAnd time t, wherein the downstream pressure ptRefers to the pressure of the downstream gas container at time t.
A real-time pseudo-pressure calculation module 403 for calculating a real-time pseudo-pressure according to the downstream pressure ptThe real-time pseudo pressure is calculated using the following formula
Wherein, the p is0Represents a reference pressure; the mug(pt) Representing said downstream pressure ptAnd the ambient temperature T0Corresponding gas viscosityDegree; the Z (p)t) Representing said downstream pressure ptAnd the ambient temperature T0A corresponding natural gas deviation factor;
a real-time permeability calculation module 404 for calculating a real-time permeability k (t) using the formula:
wherein, theRepresenting an initial pseudo pressure; said C isgRepresenting the gas compression factor at time t; the V isdRepresents the volume of the downstream gas container; the L represents the length of a core in the core holder; the r represents a radius of a core within the core holder.
An average permeability calculation module 405 for calculating the average permeability k over the experiment duration T using the following formula:
where ξ represents the time interval between two adjacent test points, tmTime, t, representing the m test pointmξ m, where m is greater than 0 and not more than
Optionally, the apparatus further comprises: an initial pseudo-pressure calculation module 406.
An initial pseudo-pressure calculation module 406 to calculate the initial pseudo-pressure using the following equation
Wherein, the p isiRepresenting the initial pressure, from said upstream pressure pinThe same; said p isjDenotes a pressure range of p0To piThe jth pressure of the n pressures; the mug(pj) Representing said downstream pressure pjAnd the ambient temperature T0The corresponding gas viscosity; the Z (p)j) Indicating the downstream pressure pjAnd the ambient temperature T0And corresponding natural gas deviation factors, wherein n is a positive integer, and j is a positive integer less than or equal to n.
Optionally, the apparatus further comprises: a gas compression factor calculation module 407.
A gas compression factor calculating module 407 for calculating the gas compression factor C at time t using the following formulag：
In summary, the permeability measuring device for the tight rock sample provided in this embodiment obtains the relationship between the downstream pressure and the time through experimental measurement, calculates the real-time pseudo-pressure, and further calculates the real-time permeability, thereby obtaining the average permeability. Because only one variable is obtained by measurement, the data processing process is simple and the time consumption is shorter.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the above functional modules is illustrated, and in practical applications, the above functions may be distributed by different functional modules according to actual needs, that is, the content structure of the device is divided into different functional modules, so as to complete all or part of the functions described above.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. A method for permeability determination of a tight rock sample, the method comprising:
obtaining an upstream pressure pinSaid upstream pressure pinThe pressure at the inlet end of the core holder is referred to;
taking a downstream pressure ptAnd time t, wherein the downstream pressure ptRefers to the pressure of the downstream gas container at time t;
according to said downstream pressure ptThe real-time pseudo pressure is calculated using the following formula
Wherein, the p is0Represents a reference pressure; the mug(pt) Representing said downstream pressure ptAnd the ambient temperature T0The corresponding gas viscosity; the Z (p)t) Representing said downstream pressure ptAnd the ambient temperature T0A corresponding natural gas deviation factor;
the real-time permeability k (t) was calculated using the following formula:
wherein, theRepresenting an initial pseudo pressure; said C isgRepresenting the gas compression factor at time t; the V isdRepresents the volume of the downstream gas container; the L represents the length of the compact rock sample in the core holder; the r represents the radius of the compact rock sample in the core holder;
the average permeability k over the experimental time period T was calculated using the following formula:
where ξ represents the time interval between two adjacent test points, tmTime, t, representing the m test pointmξ m, where m is greater than 0 and not more than
2. The method of claim 1, further comprising:
calculating the initial pseudo-pressure using the following formula
Wherein, the p isiRepresenting the initial pressure, from said upstream pressure pinThe same; said p isjDenotes a pressure range of p0To piThe jth pressure of the n pressures; the mug(pj) Representing said downstream pressure pjAnd the ambient temperature T0The corresponding gas viscosity; the Z (p)j) Indicating the downstream pressure pjAnd the ambient temperature T0And corresponding natural gas deviation factors, wherein n is a positive integer, and j is a positive integer less than or equal to n.
3. The method of claim 1, further comprising:
calculating the gas compression coefficient C at time t using the following formulag：
4. An apparatus for permeability measurement of a tight rock sample, the apparatus comprising:
an upstream pressure acquisition module for acquiring an upstream pressure pinSaid upstream pressure pinThe pressure at the inlet end of the core holder is referred to;
a downstream pressure acquisition module for acquiring a downstream pressure ptAnd time t, wherein the downstream pressure ptIs the downstream gas volume at the time tThe pressure of the vessel;
a real-time pseudo-pressure calculation module for calculating the downstream pressure ptThe real-time pseudo pressure is calculated using the following formula
Wherein, the p is0Represents a reference pressure; the mug(pt) Representing said downstream pressure ptAnd the ambient temperature T0The corresponding gas viscosity; the Z (p)t) Representing said downstream pressure ptAnd the ambient temperature T0A corresponding natural gas deviation factor;
a real-time permeability calculation module for calculating a real-time permeability k (t) using the formula:
wherein, theRepresenting an initial pseudo pressure; said C isgRepresenting the gas compression factor at time t; the V isdRepresents the volume of the downstream gas container; the L represents the length of the compact rock sample in the core holder; the r represents the radius of the compact rock sample in the core holder;
an average permeability calculation module for calculating an average permeability k over the experiment duration T using the following formula:
where ξ represents the time interval between two adjacent test points, tmTime, t, representing the m test pointmξ m, said m is largeIs greater than 0 and less than or equal to
5. The apparatus of claim 4, further comprising:
an initial pseudo-pressure calculation module for calculating the initial pseudo-pressure using the following formula
Wherein, the p isiRepresenting the initial pressure, from said upstream pressure pinThe same; said p isjDenotes a pressure range of p0To piThe jth pressure of the n pressures; the mug(pj) Representing said downstream pressure pjAnd the ambient temperature T0The corresponding gas viscosity; the Z (p)j) Indicating the downstream pressure pjAnd the ambient temperature T0And corresponding natural gas deviation factors, wherein n is a positive integer, and j is a positive integer less than or equal to n.
6. The apparatus of claim 4, further comprising:
a gas compression coefficient calculation module for calculating the gas compression coefficient C at time t using the following formulag：
7. A permeability measurement device for a tight rock sample, comprising: the device comprises an air source container, a first valve, a first pressure regulating valve, an upstream air container, a second valve, a second pressure regulating valve, a pressure gauge, a third valve, a rock core holder for placing a compact rock sample, a confining pressure pump, a downstream air container, a pressure sensor and a fourth valve; wherein,
the outlet end of the air source container is connected with the inlet end of the first pressure regulating valve; the first valve is used for controlling the communication or the separation between the outlet end of the air source container and the inlet end of the first pressure regulating valve;
the outlet end of the first pressure regulating valve is connected with the inlet end of the second pressure regulating valve, the upstream gas container is arranged on a first passage between the outlet end of the first pressure regulating valve and the inlet end of the second pressure regulating valve, and the outlet end of the upstream gas container is connected with the first passage; the second valve is used for controlling the communication or the separation between the outlet end of the upstream gas container and the inlet end of the second pressure regulating valve;
the outlet end of the second pressure regulating valve is connected with the inlet end of the core holder, and the pressure gauge is arranged on a second passage between the outlet end of the second pressure regulating valve and the inlet end of the core holder; the third valve is used for controlling the communication or the isolation of the second passage;
the outlet end of the core holder is connected with the inlet end of the downstream gas container; the pressure sensor is for measuring a downstream pressure in the downstream gas vessel; the fourth valve is used for controlling the discharge of the gas in the downstream gas container;
and the confining pressure pump is used for providing confining pressure for the compact rock sample in the rock core holder.
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| Publication number | Priority date | Publication date | Assignee | Title |
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