CN211553699U - Testing device for high-temperature high-pressure-drop internal pressure porosity stress sensitivity - Google Patents
Testing device for high-temperature high-pressure-drop internal pressure porosity stress sensitivity Download PDFInfo
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- CN211553699U CN211553699U CN202020079197.3U CN202020079197U CN211553699U CN 211553699 U CN211553699 U CN 211553699U CN 202020079197 U CN202020079197 U CN 202020079197U CN 211553699 U CN211553699 U CN 211553699U
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- core holder
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Abstract
A testing device for high-temperature and high-pressure drop internal pressure porosity stress sensitivity comprises a rock core holder, a standard air chamber, a full-automatic displacement pump, a back-pressure pump, a confining pressure pump, a control valve, a high-precision pressure sensor, a gas flowmeter, a back-pressure valve, a computer, a thermostat and an air source tank And the computer is used for respectively placing the core holder, the standard air chamber, the control valve and the connected pipelines in the constant temperature box.
Description
Technical Field
The utility model belongs to rock mechanics test field, more specifically the testing arrangement of pressure porosity stress sensitivity in high temperature high pressure drop that says so.
Background
Porosity, defined as the ratio of the pore space of a material to its total volume, is an inherent property of all reservoir rocks, and in order to reasonably evaluate the raw/gas reserves, it is understood that the volume of pore space occupied by hydrocarbons or water in the reservoir, the accuracy of the determination of porosity is largely dependent on the method used to determine porosity,
traditionally, effective porosity is defined as a measure of interconnected pore space, as determined by the difference between the measured total volume of the rock sample and the apparent particle volume, or by direct measurement of interconnected pore space, as measured by buoyancy, mercury displacement, caliper measurements, etc., as measured by particle density calculations, boyle's law two-chamber methods, as measured by pore volume single-chamber methods, fluid saturation methods, etc.,
the sensitivity of porosity stress can be explained as an effect that in the process of reservoir development, as formation fluid is exploited, the pore pressure is continuously reduced, so that the net overlying pressure borne by a rock framework is increased, and the pore structure of the rock is changed along with the change of the overlying stress, thereby influencing the exploitation,
at present, a conventional porosity measuring device is generally in a normal-temperature and confining-pressure-variable method, and is less used for a method for measuring porosity at high temperature and reduced internal pressure, for example, a plunger core porosity measured by a full-automatic core gas pore-logging instrument of model SCMS-C3 by using the normal-temperature and confining-pressure-variable method is adopted, for simulating formation conditions, as fluid is extracted in a production process, the internal pressure of the fluid is reduced, and effective stress borne by a core is increased, so that porosity stress sensitivity is generated, namely, when the porosity is measured under experimental simulation formation conditions, the influence of temperature is considered, the production practice is also met, and the core porosity is measured by reducing the internal pressure.
Disclosure of Invention
An object of the utility model is to provide a testing arrangement of porosity stress sensibility presses in high temperature high pressure drop, the device aim at survey the rock specimen porosity under the high temperature high pressure condition, for the porosity parameter change in the dynamic production process provides the experiment foundation, the rock specimen in the reaction stratum provides the prediction experiment foundation because the porosity change law of stress sensibility for production.
The device for testing the high-temperature high-pressure-drop internal pressure porosity stress sensitivity is characterized by comprising a core holder 8 with a rubber sleeve arranged on the outer side, the rubber sleeve on the outer side of the core holder 8 is connected with an external confining pressure pump 7, the left side of the core holder 8 is sequentially connected with a first high-precision pressure sensor 3 and a third control valve 17 through pipelines, the right side of the core holder 8 is sequentially connected with a third high-precision pressure sensor 5, a fifth control valve 19 and a standard air chamber 9 arranged in parallel with the core holder 8, the left side of the standard air chamber 9 is sequentially connected with a second high-precision pressure sensor 4, a fourth control valve 18, an air source tank 2, a first control valve 15 and a displacement pump 1, and the right side of the standard air chamber arranged in parallel with the core holder 8 is sequentially connected with a fourth high-precision pressure sensor 6 through one end of a pipeline, A sixth control valve 20, a back-pressure valve 12 connected with the back-pressure pump 11, a gas flow meter 13, a computer 14, wherein the core holder 8, the standard air chamber 9, the second control valve 16, the third control valve 17, the fourth control valve 18, the fifth control valve 19, the sixth control valve 20 and the connected pipelines are respectively in the incubator 10.
Further, two pipelines are connected to the outside of the gas source tank 2 in the testing device for high-temperature high-pressure-drop internal pressure porosity stress sensitivity, a first pipeline is connected with the three-way valve and is respectively connected with the first high-precision pressure sensor 3 and the third control valve 17 on the left side of the core holder 8, the second high-precision pressure sensor 4 and the fourth control valve 18 on the left side of the standard air chamber 9, and the other pipeline is respectively connected with the third high-precision pressure sensor 5 and the fifth control valve 19 on the right side of the core holder 8, the fourth high-precision pressure sensor 6 and the sixth control valve 20 on the left side of the standard air chamber 9 through the second control valve 16 and the three-way valve.
Further, in the device for testing the high-temperature high-pressure-drop internal pressure porosity stress sensitivity, the upper end of a back-pressure valve 12 is connected with a back-pressure pump 11 through a pipeline, the lower end of the back-pressure valve 12 is connected with two pipelines, one pipeline is connected with a gas flow joint 13, and the other pipeline is respectively connected with a third high-precision pressure sensor 5 and a fifth control valve 19 on the right side of the rock core holder 8, and a fourth high-precision pressure sensor 6 and a sixth control valve 20 on the left side of a standard gas chamber 9 through a three-way valve.
Further, the left end and the right end of the thermostat 10 in the testing device for high-temperature high-pressure-drop internal pressure porosity stress sensitivity are respectively provided with an outlet for placing a pipeline, so that the external air source tank 2 and the back pressure valve 12 are connected with the internal rock core holder 8 and the standard air chamber 9, and the thermostat 10 is provided with 4 small gaps for respectively placing pipelines so that the first high-precision pressure sensor 3, the second high-precision pressure sensor 4, the third high-precision pressure sensor 5 and the fourth high-precision pressure sensor 6 are connected with the internal pipeline.
The utility model has the advantages and positive effects that: utilize experimental apparatus thermostated container simulation formation pressure, utilize experimental apparatus confined pressure pump simulation formation overburden pressure, utilize the internal fluid pressure of experimental apparatus air supply jar simulation rock core, utilize boyle's law survey rock specimen porosity and change value and record through changing the formation pressure change and the internal fluid pressure change survey porosity in the experimental design parameter simulation production process, reach dynamic measurement's purpose.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the testing device of the present invention.
In the figure: the device comprises a core holder 7, a standard air chamber 9, a full-automatic displacement pump 1, a back-pressure pump 11, a confining pressure pump 7, a first control valve 15, a second control valve 16, a third control valve 17, a fourth control valve 18, a fifth control valve 19, a sixth control valve 20, a first high-precision pressure sensor 3, a second high-precision pressure sensor 4, a third high-precision pressure sensor 5, a fourth high-precision pressure sensor 6, a gas flowmeter 13, a back-pressure valve 12, a computer 14, a thermostat 10 and an air source tank 2.
FIG. 2 is a porosity stress sensitivity curve of a test core of the testing apparatus of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily understood by the description.
(1) Preparing a core: the selected core is extracted, cleaned and dried, then the dry weight, the diameter and the length are measured, (about 5cm long and 2.5cm diameter of the plunger sample core) are kept, the control valve in the device is kept in a closed state,
(2) firstly, calibrating the dead volume of a pipeline, calibrating the internal volume (Vr) of a standard air chamber 9 and the internal volume (Vc) of a core holder 8, then putting a plunger sample core into the core holder 8, pressurizing by a confining pressure pump 7 to enable the core holder to simulate the overburden pressure of a stratum to be stable, simulating the temperature of the stratum to be stable by an oven 10, opening a third control valve 17, filling gas in a gas source tank 2 into a sample chamber by predetermined pressure (namely simulated in-formation pressure), then closing the third control valve 17,
(3) whether the gas in the core holder is completely inflated and stable is determined by whether the readings of the first high-precision pressure sensor 3 and the high-precision pressure sensor 5 are equal or not. (if the first and third high-precision pressure sensors on the left and right sides of the core holder 8 are equal and equal to the simulated design internal pressure, the next step can be carried out, if the pressure sensors are not equal or equal to the design internal pressure, the pressure sensors are unstable or the pressure sensors are lower and need to be stabilized or the internal pressure is increased),
(4) opening a fifth control valve 19, opening a sixth control valve 20 to enable the gas in the rock core holder 8 to expand into a standard gas chamber 9, recording the displayed readings through a computer 14 after the readings of the first high-precision pressure sensor 3, the second high-precision pressure sensor 4, the third high-precision pressure sensor 5 and the fourth high-precision pressure sensor 6 are stable, calculating the pore volume of the rock sample through a gas law equation after the system is stable (the readings of the pressure sensors at the left end and the right end are the same),
(5) from the initial pressure of the standard gas cell 9 and the final system pressure, the pore volume of the rock sample is calculated by the gas law equation. The following pore volume calculation formula is derived from the mass balance of the gas in the standard gas chamber 9 and the core holder 8:
in the formula:
P1-initial pressure of standard air cell-
Pa-
P2-
Z1-in P-1And T1Gas deviation factor of time
Za-in P-aAnd TaGas deviation factor of time
Z2-in P-2And T2Gas deviation factor of time
T1-in P-1Time calibrating temperature in gas chamber
Ta-in P-aTime calibrating temperature in gas chamber
T2-in P-2Temperature after system stabilization
Vr-standard air chamber internal volume
Vg-
Vc-
Phi- — the porosity of the core
The device is in a constant temperature system, then T1＝Ta＝T2Isothermal conditions, further simplified by:
wherein P is1Can be regarded as the standard atmospheric pressure, PaTo simulate the internal pressure of a fluid in the formation (to which pressure is adjusted by means of a source tank), T1、Ta、T2Temperature control for thermostats (simulated formation temperature), Z1、Za、 Z2The deviation factor V of the corresponding simulation gas source under the temperature and the pressure can be found by a graphic methodc、VrThe volume of the middle standard air chamber can be calibrated through a standard block, the total volume of the appearance of the rock core can be calculated through a caliper measuring method, and the specific calculation is Vc＝hπr2Wherein h is the core length, r is the core radius,
(5) after the porosity under the original formation temperature and pressure is calculated for one time, the gas in the standard gas chamber 9 is discharged, and the pressure is recovered to the original pressure P1At the time of pressure P in the core holder2Can be used in the second calculation and is reassigned to the value PaRepeating the operations (3), (4) and (5) to calculate the porosity under different internal pressures,
the stress sensitivity of the porosity of the rock core under the stratum condition can be reflected by calculating the porosity under different internal pressures, the stress sensitivity of the porosity can be visually reflected by drawing porosity value curves under different effective pressures, and the attached figure 2 can be seen, and other parts which are not illustrated belong to the prior art.
Claims (4)
1. The device for testing the high-temperature high-pressure-drop internal pressure porosity stress sensitivity is characterized by comprising a core holder (8) with a rubber sleeve arranged on the outer side, wherein the rubber sleeve on the outer side of the core holder (8) is connected with an external confining pressure pump (7), the left side of the core holder (8) is sequentially connected with a first high-precision pressure sensor (3) and a third control valve (17) through pipelines, the right side of the core holder (8) is sequentially connected with a third high-precision pressure sensor (5) and a fifth control valve (19) through pipelines, the left side of a standard air chamber (9) in parallel arrangement with the core holder (8) is sequentially connected with a second high-precision pressure sensor (4), a fourth control valve (18), an air source tank (2), a first control valve (15) and a displacement pump (1), the right side of a standard air chamber placed in parallel with the core holder (8) is sequentially connected with a fourth high-precision pressure sensor (6), a sixth control valve (20), a back pressure valve (12) connected with a back pressure pump (11), a gas flowmeter (13) and a computer (14) through one end of a pipeline, wherein the core holder (8), the standard air chamber (9), the second control valve (16), the third control valve (17), the fourth control valve (18), the fifth control valve (19), the sixth control valve (20) and the connected pipeline are respectively positioned in a constant temperature box (10).
2. The device for testing the porosity stress sensitivity of internal pressure under high temperature and high pressure drop according to claim 1, the device is characterized in that two pipelines are connected to the outside of a gas source tank (2) in the device for testing high-temperature high-pressure-drop internal pressure porosity stress sensitivity, a first pipeline is connected with a three-way valve and is respectively connected with a first high-precision pressure sensor (3) and a third control valve (17) on the left side of a rock core holder (8), a second high-precision pressure sensor (4) and a fourth control valve (18) on the left side of a standard air chamber (9), and the other pipeline is respectively connected with a third high-precision pressure sensor (5) and a fifth control valve (19) on the right side of the rock core holder (8), a fourth high-precision pressure sensor (6) and a sixth control valve (20) on the left side of the standard air chamber (9) through the fourth control valve (18) and the three-way.
3. The device for testing the porosity and stress sensitivity of the internal pressure of the high-temperature high-pressure drop as claimed in claim 1, wherein the upper end of a back-pressure valve (12) in the device for testing the porosity and stress sensitivity of the internal pressure of the high-temperature high-pressure drop is connected with a back-pressure pump (11) through a pipeline, the lower end of the back-pressure valve (12) is connected with two pipelines, one pipeline is connected with a gas flowmeter (13), and the other pipeline is respectively connected with a third high-precision pressure sensor (5) and a fifth control valve (19) on the right side of the core holder (8), and a fourth high-precision pressure sensor (6) and a sixth control valve (20) on the left side of the standard air chamber (9) through a three-.
4. The device for testing the porosity and stress sensitivity under high temperature and high pressure drop according to claim 1, wherein the left end and the right end of the thermostat (10) in the device for testing the porosity and stress sensitivity under high temperature and high pressure drop are respectively provided with an outlet for placing pipelines, so that the external air source tank (2) and the back pressure valve (12) are connected with the internal core holder (8) and the standard air chamber (9), and the thermostat (10) is provided with four small gaps for respectively placing pipelines so that the first high-precision pressure sensor (3), the second high-precision pressure sensor (4), the third high-precision pressure sensor (5), the fourth high-precision pressure sensor (6) are connected with the internal pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020079197.3U CN211553699U (en) | 2020-01-15 | 2020-01-15 | Testing device for high-temperature high-pressure-drop internal pressure porosity stress sensitivity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020079197.3U CN211553699U (en) | 2020-01-15 | 2020-01-15 | Testing device for high-temperature high-pressure-drop internal pressure porosity stress sensitivity |
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| CN211553699U true CN211553699U (en) | 2020-09-22 |
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| CN202020079197.3U Expired - Fee Related CN211553699U (en) | 2020-01-15 | 2020-01-15 | Testing device for high-temperature high-pressure-drop internal pressure porosity stress sensitivity |
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2020
- 2020-01-15 CN CN202020079197.3U patent/CN211553699U/en not_active Expired - Fee Related
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Granted publication date: 20200922 Termination date: 20220115 |