CN115405286A - Measuring device and measuring method for anisotropic reservoir stress sensitivity - Google Patents
Measuring device and measuring method for anisotropic reservoir stress sensitivity Download PDFInfo
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- CN115405286A CN115405286A CN202210978457.4A CN202210978457A CN115405286A CN 115405286 A CN115405286 A CN 115405286A CN 202210978457 A CN202210978457 A CN 202210978457A CN 115405286 A CN115405286 A CN 115405286A
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- 230000035945 sensitivity Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 84
- 230000035699 permeability Effects 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims description 33
- 239000007791 liquid phase Substances 0.000 claims description 11
- 239000012071 phase Substances 0.000 claims description 11
- 238000002474 experimental method Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the field of petroleum drilling engineering, and particularly relates to a device and a method for measuring anisotropic reservoir stress sensitivity. The device is controlled by a computer system and comprises a gas cylinder, a liquid bottle, a gas-liquid chamber, a reaction kettle, a rubber sleeve and a collecting bottle, wherein the gas cylinder and the liquid bottle are connected with the gas-liquid chamber, the gas-liquid chamber is connected with a sample in the reaction kettle and then is connected with the collecting bottle outside the reaction kettle; the rubber sleeve is placed inside the reaction kettle, the sample is placed inside the rubber sleeve, and hydraulic jacks are arranged on the upper portion, the lower portion, the left portion and the right portion of the rubber sleeve. The measuring device provided by the invention has the advantages of reasonable structure and simplicity in operation, can measure the permeability of the anisotropic sample in different stress states, better simulates the original stress state, can obtain the permeability of the same anisotropic sample in different directions, is reliable in measuring method, and can better reflect the anisotropy of the sample.
Description
Technical Field
The invention belongs to the field of petroleum drilling engineering, and particularly relates to a device and a method for measuring anisotropic reservoir stress sensitivity.
Background
The reservoir stress sensitivity can refer to the property that permeability changes along with stress, the permeability of a reservoir sample is not a constant under different stress states, and the permeability of the sample shows obvious anisotropy due to the influence of a deposition environment of the sample, so that the exploitation and the effect evaluation of the sample are not ideal. Therefore, the method has important engineering significance for accurately measuring the reservoir stress sensitivity of the anisotropic sample.
Most of the existing researches determine permeability by changing the pressure of an overburden stratum, most of reaction kettles can not well reflect the anisotropy of samples in different stress states, the actual operation is not simple and convenient, and the test of the stress sensitivity of the anisotropic sample reservoir is restricted. The existing reaction kettle adopts a method of introducing gas flow to measure the permeability, but the result measured by the method is not high in precision.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for measuring the stress sensitivity of an anisotropic reservoir, which are used for respectively carrying out transverse and longitudinal experiments on an anisotropic sample under different stress conditions to obtain gas-phase permeability data and liquid-phase permeability data of the sample under different stress conditions and in different directions.
The technical scheme is as follows:
a stress sensitivity measuring device for an anisotropic reservoir comprises a gas cylinder, a liquid bottle, a gas-liquid chamber, a reaction kettle, a rubber sleeve, a vacuum pump, a temperature sensor and a collecting bottle, wherein the reaction kettle is buckled on a base, the rubber sleeve is placed in the reaction kettle, a sample is placed in the rubber sleeve, the bottom of the rubber sleeve is arranged on the base through a hydraulic jack, and the hydraulic jacks are also arranged on the upper surface, the left surface and the right surface of the rubber sleeve;
the vacuum pump is arranged outside the reaction kettle through a pipeline, and the temperature sensor is inserted into the reaction kettle and fixed;
the gas bottle outlet is connected with the gas-liquid chamber through a gas inlet hose, the liquid bottle outlet is connected with the gas-liquid chamber through a liquid inlet hose, the gas-liquid chamber is respectively connected with a sample in the reaction kettle through a transverse inlet channel and a longitudinal inlet channel, and then is connected with a collecting bottle outside the reaction kettle through a transverse discharge channel and a longitudinal discharge channel;
and each hydraulic jack, the temperature sensor, the vacuum pump and the respective valve are connected with a computer system through wireless data signals or connecting wires.
Preferably, the rubber sleeve is of a square structure, the rubber sleeve is opened and closed through the upper cover, the center of the rubber sleeve is provided with a cavity of the square structure, the size and the structure of the sample are matched with the cavity, the upper cover is provided with a sealing ring, and sealing is realized through the sealing ring when the cover is closed.
Preferably, the upper end face of the rubber sleeve is provided with an opening connected with the longitudinal inlet channel, the lower end face of the rubber sleeve is provided with an opening connected with the longitudinal discharge channel, the left end face of the rubber sleeve is provided with an opening connected with the transverse inlet channel, the right end face of the rubber sleeve is provided with an opening connected with the transverse discharge channel, a sealing ring is installed at each opening, and each opening is arranged beside the hydraulic jack.
Preferably, automatic valves are respectively arranged at the outlets of the gas cylinder and the liquid bottle; automatic valves are respectively arranged at the joint of the gas-liquid chamber and the transverse inlet channel and the joint of the gas-liquid chamber and the longitudinal inlet channel; automatic valves are respectively arranged at the inlets of the transverse discharge channel and the longitudinal discharge channel which are connected with the collecting bottle; and an automatic valve is arranged at the outlet of the vacuum pump.
Preferably, a sealing ring is arranged at the joint of the base and the reaction kettle; the base is provided with openings matched with the longitudinal discharge channel and the transverse discharge channel, the longitudinal discharge channel and the transverse discharge channel penetrate through the openings, and sealing rings are arranged at the positions of the openings; the upper wall plate of the reaction kettle is provided with openings matched with the pipelines of the longitudinal inlet channel, the transverse inlet channel and the vacuum pump, and sealing rings are arranged at the openings.
Preferably, pressure gauges are respectively installed on the transverse inlet channel and the longitudinal inlet channel; and a pressure gauge, a gas flowmeter and a liquid flowmeter are sequentially arranged on the transverse discharge channel of the outer section of the reaction kettle, and the pressure gauge, the gas flowmeter and the liquid flowmeter are also sequentially arranged on the longitudinal discharge channel.
Preferably, the rubber sleeve is placed on the upper end face of the hydraulic jack in the center of the base; the upper wall plate, the left side wall and the right side wall of the reaction kettle are provided with brackets for mounting the hydraulic jacks, and each bracket can just support or fix the hydraulic jack and make the top end surface of each hydraulic jack contact with the corresponding surface of the rubber sleeve.
Preferably, a rubber pad is arranged on the end face of each hydraulic jack, which is in contact with the rubber sleeve.
The measuring method of the anisotropic reservoir stress sensitivity measuring device comprises the following specific steps:
(1) Selecting an anisotropic sample, processing the anisotropic sample into a cubic sample, putting the sample into a rubber sleeve, covering the rubber sleeve with a cover, and sealing;
(2) Placing a rubber sleeve on a hydraulic jack in the center of a base, installing other hydraulic jacks on a bracket of a reaction kettle, buckling the reaction kettle on the base, and sealing the reaction kettle by a sealing ring;
(3) Opening a vacuum pump, extracting air in the reaction kettle, and closing the vacuum pump after the preset value is reached;
(4) Opening automatic valves of gas bottle and liquid bottle, respectively introducing gas and liquid into gas-liquid chamber, then opening two automatic valves at inlet of collecting bottle on longitudinal inlet channel and longitudinal outlet channel, introducing gas and liquid into sample, simultaneously opening hydraulic jacks in upper and lower two directions of sample, applying stress to sample, after reaching preset value, utilizing gas flowmeter on longitudinal outlet channel to measure gas flow passing through and utilizing liquid flowmeter to measure liquid flow passing through, utilizing pressure gauge of longitudinal inlet channel to measure inlet pressure, and setting inlet pressure as P 1 With the outlet pressure measured by a pressure gauge on the longitudinal discharge channel set to P 2 After the experiment is finished, automatic valves at the longitudinal inlet passage and the inlet of the collecting bottle are closed;
(5) Opening two automatic valves at the inlet of the collecting flask in the transverse inlet and outlet channelsThe door is used for introducing gas and liquid into the sample, simultaneously opening the hydraulic jacks in the left direction and the right direction of the sample to apply stress to the sample, measuring the gas flow passing through by using the gas flow meter on the transverse discharge channel and the liquid flow passing through by using the liquid flow meter after the preset value is reached, and measuring the inlet pressure by using the pressure gauge of the transverse inlet channel to set the inlet pressure as P 1 The outlet pressure measured by a pressure gauge on the transverse discharge channel is set to P 2 After the experiment is finished, all automatic valves are closed;
(6) Respectively substituting the gas flow value, the liquid flow value and the inlet and outlet pressure values into a gas phase and liquid phase permeability formula of the hydrate to obtain the gas phase permeability and the liquid phase permeability of the hydrate sample in the direction;
in the formula, K ge As gas phase permeability, K we Is the liquid phase permeability; q g Is the gas flow rate, mL/s; q w Is the liquid flow rate, mL/s; mu.s g Is gas viscosity, MPa.s; mu.s w Is liquid viscosity, MPa.s; l is the length of the hydrate sample, cm; p is 1 ，P 2 Respectively the inlet and outlet pressure, MPa; p a Atmospheric pressure, MPa;
(7) Under the condition that the placing direction of the sample is not changed, changing the stress condition, and repeating the steps (4) to (6) to obtain the permeability data of the same anisotropic sample in different stress states;
(8) Changing the placing direction of the sample in the rubber sleeve under the condition that the stress condition is not changed, and repeating the step (4)
Obtaining permeability data of the same anisotropic sample in different directions;
after the hydraulic jacks and the vacuum pump are installed, starting and closing the hydraulic jacks and the vacuum pump through a computer system or automatically closing the hydraulic jacks and the vacuum pump by setting numerical values; the respective valves are opened and closed through a computer system; the temperature sensor, the pressure gauge, the gas flowmeter and the liquid flowmeter output the numerical values to the computer system, and the calculation is carried out through the computer system.
Compared with the prior art, the invention has the advantages that:
(1) The measuring device is reasonable in structure and simple to operate, can measure the permeability of the anisotropic sample under different stress states, and better simulates the original ground stress state;
(2) The measuring device can obtain the liquid phase permeability and the gas phase permeability of the same anisotropic sample in different directions, the measuring method is reliable, and the anisotropy of the sample can be better reflected.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention (excluding the computer system);
FIG. 2 is a sectional view of the rubber boot structure of the present invention;
FIG. 3 is a perspective view of the rubber sleeve structure of the present invention;
FIG. 4 is a perspective view of an anisotropic sample of the present invention.
In the figure, 1, a gas bottle, 2, a liquid bottle, 3, a first automatic valve, 4, a second automatic valve, 5, a gas inlet hose, 6, a liquid inlet hose, 7, a gas-liquid chamber, 8, a third automatic valve, 9, a fourth automatic valve, 10, a longitudinal inlet channel, 11, a transverse inlet channel, 12, a reaction kettle, 13, a sample, 14, a rubber sleeve, 15, a sixth automatic valve, 16, a rubber pad, 17, a fifth automatic valve, 18, a collecting bottle, 19, a base, 20, a sealing ring, 21, a longitudinal outlet channel, 22, a transverse outlet channel, 23, a first gas flowmeter, 24, a second gas flowmeter, 25, a first liquid flowmeter, 26, a second liquid flowmeter, 27, a seventh automatic valve, 28, a vacuum pump, 29, a temperature sensor, 30, a sealing ring, 31, a first pressure gauge, 32, a second pressure gauge, 32, a third pressure gauge, 34, a fourth pressure gauge, 35, a support, 36 and a hydraulic jack.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention, that is, the embodiments described are only a few, and not all, embodiments of the invention. Some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; for those skilled in the art, some well-known structures in the drawings and descriptions thereof may be omitted; the terms "upper," "lower," "top," "bottom," "side," "end," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify description, and are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
As shown in fig. 1, a schematic structure of an anisotropic hydrate reservoir stress sensitivity measuring device, a hydraulic jack 36 and a computer system both adopt the prior art, and software conforming to the testing device is installed in the computer system, which is not shown in the figure. The device comprises a gas bottle 1, a liquid bottle 2, a gas-liquid chamber 7, a reaction kettle 12, a rubber sleeve 14, a vacuum pump 28, a temperature sensor 29 and a collecting bottle 18, wherein the reaction kettle 12 is buckled on a base 19, the rubber sleeve 14 is placed in the reaction kettle 12, a sample 13 is placed in the rubber sleeve 14, the bottom of the rubber sleeve 14 is arranged on the base 19 through a hydraulic jack 36, and the hydraulic jacks 36 are also arranged on the upper surface, the left surface and the right surface of the rubber sleeve 14 and used for applying stress to the sample 13;
the vacuum pump 28 is installed outside the reaction kettle 12 through a pipeline and used for pumping out air in the reaction kettle 12, and the temperature sensor 29 is inserted into the reaction kettle 12 and fixed and used for measuring the temperature in the reaction kettle 12;
an outlet of the gas bottle 1 is connected with a gas-liquid chamber 7 through a gas inlet hose 5, an outlet of the liquid bottle 2 is connected with the gas-liquid chamber 7 through a liquid inlet hose 6, the gas-liquid chamber 7 is respectively connected with a hydrate sample 13 in the reaction kettle 12 through a transverse inlet channel 11 and a longitudinal inlet channel 10, and then is connected with a collecting bottle 18 outside the reaction kettle 12 through a transverse outlet channel 22 and a longitudinal outlet channel 23;
the hydraulic jacks 36, the temperature sensors 29, the vacuum pump 28 and the respective valves are connected with a computer system through wireless data signals or connecting lines, the computer system controls the opening or closing of the hydraulic jacks 36, the vacuum pump 28 and the respective valves, and the temperature sensors 29 transmit measurement data to the computer system.
As shown in fig. 2 and 3, the rubber sleeve 14 is a square structure, specifically a cube structure, and is opened and closed by an upper cover, a cavity of the square structure is provided in the center of the rubber sleeve, and the hydrate sample 13 can be placed in the cavity by opening the upper cover. As shown in fig. 4, the size and structure of the sample 13 are adapted to the cavity, a circle of sealing ring is mounted on the upper cover, and sealing is achieved through the sealing ring when the upper cover is closed.
The rubber sleeve 14 is placed on the upper end face of the hydraulic jack in the center of the base 19; the upper wall plate, the left side wall and the right side wall of the reaction kettle 12 are provided with brackets for mounting hydraulic jacks, the bottom ends of the hydraulic jacks are in contact with the upper wall plate, the left side wall and the right side wall, the top end faces of the hydraulic jacks are in contact with the corresponding faces of the rubber sleeve 14, and balance can be kept when stress is applied. The upper end face of the rubber sleeve 14 is provided with an opening connected with the longitudinal inlet channel 10, the lower end face of the rubber sleeve is provided with an opening connected with the longitudinal discharge channel 21, the left end face of the rubber sleeve is provided with an opening connected with the transverse inlet channel 11, the right end face of the rubber sleeve is provided with an opening connected with the transverse discharge channel 22, a sealing ring 30 is installed at each opening, and each opening is arranged beside the hydraulic jack 36.
Furthermore, rubber pads are arranged on the end faces of the hydraulic jacks, which are in contact with the rubber sleeves, so that the rubber sleeves 14 can be further protected and are not easy to damage.
A first automatic valve 3 is arranged at the outlet of the gas bottle, and a second automatic valve is arranged at the outlet of the liquid bottle; gas and liquid enter the gas-liquid chamber to mix, said gas-liquid chamber 7 has fourth automatic valve 9 with entering the junction of the channel 11 horizontally, have third automatic valve 8 with entering the junction of the channel 10 longitudinally; a sixth automatic valve 15 is arranged at the inlet of the transverse discharge channel 22 connected with the collecting bottle 18, and a fifth automatic valve 17 is arranged at the inlet of the longitudinal discharge channel 21 connected with the collecting bottle 18; a seventh automatic valve 29 is arranged at the outlet of the vacuum pump 28.
In order to realize the sealing of the reaction kettle 12 and the rubber sleeve 14, sealing rings are arranged at all the openings connected with the reaction kettle and the rubber sleeve for sealing the connection between the openings and the pipeline. The reaction kettle 12 is buckled on a base 19, and a sealing ring 20 is also arranged at the joint.
A second pressure gauge 32 is arranged on the transverse inlet channel 11, and a first pressure gauge 31 is arranged on the longitudinal inlet channel 10; and a third pressure gauge 33, a first gas flowmeter 23 and a first liquid flowmeter 25 are sequentially arranged on the longitudinal discharge channel 21 at the outer section of the reaction kettle 12, and a fourth pressure gauge 34, a second gas flowmeter 24 and a second liquid flowmeter 26 are sequentially arranged on the transverse discharge channel 22.
The measuring method of the anisotropic hydrate reservoir stress sensitivity measuring device comprises the following specific steps:
(1) Selecting a sample 13 with an anisotropic hydrate processed into a cubic shape, placing the sample 13 into a rubber sleeve 14, covering the rubber sleeve with a cover, and sealing;
(2) Placing the rubber sleeve 14 on a hydraulic jack in the center of the base 19, installing other hydraulic jacks on a bracket of the reaction kettle 13, buckling the reaction kettle 12 on the base 19, and sealing by a sealing ring;
(3) Opening the vacuum pump 28, extracting air in the reaction kettle 12 to prevent the air in the reaction kettle 12 from interfering the experiment, and closing the vacuum pump 28 after the air reaches a preset value;
(4) Opening the first automatic valve 3 and the second automatic valve 4, respectively introducing gas and liquid into the gas-liquid chamber 7, then opening the third automatic valve 8 and the fifth automatic valve 17, introducing gas and liquid into the hydrate sample 13, simultaneously opening the hydraulic jacks in the upper direction and the lower direction of the sample 13, applying stress to the sample 13, after reaching a preset value, measuring the passing gas flow by using the first gas flow meter 23 and measuring the passing liquid flow by using the first liquid flow meter 25The inlet pressure measured by the first pressure gauge 31 is set to P 1 Measured outlet pressure P using a third pressure gauge 33 2 After the experiment is finished, the third automatic valve 8 and the fifth automatic valve 17 are closed;
(5) Opening the fourth automatic valve 9 and the sixth automatic valve 15, introducing gas and liquid into the hydrate sample 13, simultaneously opening hydraulic jacks in the left direction and the right direction of the sample 13, applying stress to the sample, measuring the flow of the gas passing through by using the second gas flowmeter 24 and the flow of the liquid passing through by using the second liquid flowmeter 26 after the preset value is reached, and measuring the inlet pressure by using the second pressure gauge 32, wherein the inlet pressure is set as P 1 The outlet pressure measured by the fourth pressure gauge 34 is set to P 2 After the experiment is finished, closing all automatic valves;
(6) Respectively substituting the gas flow value, the liquid flow value and the inlet and outlet pressure values into a gas-phase and liquid-phase permeability formula of the sample to obtain the gas-phase permeability and the liquid-phase permeability of the sample in the direction;
in the formula, K ge As gas phase permeability, K we Is the liquid phase permeability; q g Is the gas flow rate, mL/s; q w Is the liquid flow rate, mL/s; mu.s g Is gas viscosity, MPa.s; mu.s w Is liquid viscosity, MPa.s; l is the length of the hydrate sample, cm; p 1 ，P 2 Respectively the inlet and outlet pressure, MPa; p a Atmospheric pressure, MPa;
(7) Under the condition that the placing direction of the sample is not changed, changing the stress condition, and repeating the steps (4) to (6) to obtain the permeability data of the same anisotropic sample in different stress states;
(8) And (3) under the condition that the stress condition is not changed, changing the placing direction of the sample in the rubber sleeve, and repeating the steps (4) to (6) to obtain the permeability data of the same anisotropic sample in different directions.
Measurements may be repeated several times as necessary for the data obtained to be more accurate.
The reaction kettle 12 is made of stainless steel hard materials, the supports 35 used for supporting the hydraulic jacks 36 are installed on the upper, left and right side walls in the reaction kettle 12, the hydraulic jacks 36 are conventional hydraulic jacks which are small in size and can be automatically controlled in the prior art, the installation structures and the positions of the supports 35 are matched with the hydraulic jacks 36, the supports 35 can just support or fix the hydraulic jacks 36, and when force is applied to the hydraulic jacks, the samples 13 in the rubber sleeve 14 can be squeezed forcibly, and only a schematic diagram is drawn in fig. 1.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection may be mechanical or electrical, and the circuit connection is also conventional in the art and will not be described in detail herein.
Furthermore, it should be understood that although the present description refers to embodiments, the device of the present invention does not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art, and also fall within the protection scope of the present invention.
Claims (9)
1. The device for measuring the stress sensitivity of the anisotropic reservoir is characterized by comprising a gas cylinder, a liquid bottle, a gas-liquid chamber, a reaction kettle, a rubber sleeve, a vacuum pump, a temperature sensor and a collecting bottle, wherein the reaction kettle is buckled on a base, the rubber sleeve is placed in the reaction kettle, a sample is placed in the rubber sleeve, the bottom of the rubber sleeve is arranged on the base through a hydraulic jack, and the hydraulic jacks are also arranged on the upper surface, the left surface and the right surface of the rubber sleeve;
the vacuum pump is arranged outside the reaction kettle through a pipeline, and the temperature sensor is inserted into the reaction kettle and fixed;
the outlet of the gas bottle is connected with the gas-liquid chamber through an air inlet hose, the outlet of the liquid bottle is connected with the gas-liquid chamber through an liquid inlet hose, the gas-liquid chamber is respectively connected with a sample in the reaction kettle through a transverse inlet channel and a longitudinal inlet channel, and then is connected with a collecting bottle outside the reaction kettle through a transverse outlet channel and a longitudinal outlet channel;
and each hydraulic jack, the temperature sensor, the vacuum pump and the respective valve are connected with a computer system through wireless data signals or connecting wires.
2. The device for measuring the stress sensitivity of the anisotropic reservoir layer according to claim 1, wherein the rubber sleeve is of a square structure, the rubber sleeve is opened and closed through an upper cover, a cavity of the square structure is formed in the center of the rubber sleeve, the size and the structure of the sample are matched with the cavity, a sealing ring is installed on the upper cover, and sealing is achieved through the sealing ring when the upper cover is closed.
3. An anisotropic reservoir stress sensitivity measuring device as claimed in claim 2, wherein the rubber sleeve has openings at its upper end face for connection to the longitudinal inlet passage, at its lower end face for connection to the longitudinal outlet passage, at its left end face for connection to the transverse inlet passage, and at its right end face for connection to the transverse outlet passage, and at each opening a sealing ring is mounted, each opening being located beside the hydraulic jack.
4. The anisotropic reservoir stress sensitivity measuring device of claim 1, wherein automatic valves are respectively arranged at the outlets of the gas cylinder and the liquid bottle; automatic valves are respectively arranged at the joint of the gas-liquid chamber and the transverse inlet channel and the joint of the gas-liquid chamber and the longitudinal inlet channel; automatic valves are respectively arranged at the inlets of the transverse discharge channel and the longitudinal discharge channel, which are connected with the collecting bottle; and an automatic valve is arranged at the outlet of the vacuum pump.
5. The anisotropic reservoir stress sensitivity measuring device of claim 1, wherein a sealing ring is arranged at the joint of the base and the reaction kettle; the base is provided with openings matched with the longitudinal discharge channel and the transverse discharge channel, the longitudinal discharge channel and the transverse discharge channel penetrate through the openings, and sealing rings are arranged at the positions of the openings; the upper wall plate of the reaction kettle is provided with openings matched with the longitudinal inlet channel, the transverse inlet channel and the vacuum pump, and sealing rings are arranged at the openings.
6. The anisotropic reservoir stress sensitivity measuring device of claim 1, wherein pressure gauges are respectively installed on the transverse inlet channel and the longitudinal inlet channel; and a pressure gauge, a gas flowmeter and a liquid flowmeter are sequentially arranged on a transverse discharge channel of the external section of the reaction kettle, and the pressure gauge, the gas flowmeter and the liquid flowmeter are also sequentially arranged on a longitudinal discharge channel.
7. An anisotropic reservoir stress sensitivity measuring device as claimed in claim 1, wherein the rubber sleeve is placed on the upper end face of the hydraulic jack at the central position of the base; the upper wall plate, the left side wall and the right side wall of the reaction kettle are provided with supports for mounting the hydraulic jacks, and each support can just support or fix the hydraulic jack and enable the top end face of each hydraulic jack to be in contact with the corresponding face of the rubber sleeve.
8. An anisotropic reservoir stress sensitivity measuring device as defined in claim 7, wherein a rubber pad is provided on an end surface of each of said hydraulic jacks contacting with said rubber sleeve.
9. The method for measuring the anisotropic reservoir stress sensitivity measuring device according to any one of claims 1 to 8, comprising the following specific steps:
(1) Selecting an anisotropic sample, processing the anisotropic sample into a cubic sample, putting the sample into a rubber sleeve, covering the rubber sleeve with a cover, and sealing;
(2) Placing a rubber sleeve on a hydraulic jack in the center of a base, installing other hydraulic jacks on a bracket of a reaction kettle, buckling the reaction kettle on the base, and sealing the reaction kettle by a sealing ring;
(3) Opening a vacuum pump, extracting air in the reaction kettle, and closing the vacuum pump after the preset value is reached;
(4) Opening automatic valves of gas bottle and liquid bottle, respectively introducing gas and liquid into gas-liquid chamber, then opening two automatic valves at inlet of collecting bottle on longitudinal inlet channel and longitudinal outlet channel, introducing gas and liquid into sample, simultaneously opening hydraulic jacks in upper and lower two directions of sample, applying stress to sample, after reaching preset value, utilizing gas flowmeter on longitudinal outlet channel to measure passing gas flow and utilizing liquid flowmeter to measure passing liquid flow, utilizing pressure gauge of longitudinal inlet channel to measure inlet pressure and setting inlet pressure as P 1 With the outlet pressure measured by a pressure gauge on the longitudinal discharge channel set to P 2 After the experiment is finished, automatic valves at the longitudinal inlet channel and the inlet of the collecting bottle are closed;
(5) Opening two automatic valves at the inlet of the collecting bottle on the transverse inlet channel and the transverse outlet channel, introducing gas and liquid into the sample, simultaneously opening hydraulic jacks in the left direction and the right direction of the sample, applying stress to the sample, measuring the gas flow passing through by using a gas flow meter on the transverse outlet channel and the liquid flow passing through by using a liquid flow meter after reaching a preset value, and setting the inlet pressure measured by using a pressure meter of the transverse inlet channel as P 1 With the outlet pressure measured by a pressure gauge on the transverse discharge channel set to P 2 After the experiment is finished, all automatic valves are closed;
(6) Respectively substituting the gas flow value, the liquid flow value and the inlet and outlet pressure values into a gas phase and liquid phase permeability formula to obtain the gas phase permeability and the liquid phase permeability of the sample in the direction;
in the formula, K ge As gas phase permeability, K we Is the liquid phase permeability; q g Is the gas flow rate, mL/s; q w Is the liquid flow rate, mL/s; mu.s g Gas viscosity, MPa · s; mu.s w Is liquid viscosity, MPa.s; l is the length of the hydrate sample, cm; p is 1 ，P 2 Respectively the inlet and outlet pressure, MPa; p a Atmospheric pressure, MPa;
(7) Under the condition that the placing direction of the sample is not changed, changing the stress condition, and repeating the steps (4) to (6) to obtain the permeability data of the same anisotropic sample in different stress states;
(8) Under the condition that the stress condition is not changed, changing the placing direction of the sample in the rubber sleeve, and repeating the steps (4) to (6) to obtain the permeability data of the same anisotropic sample in different directions;
after the hydraulic jacks and the vacuum pump are installed, starting and closing the hydraulic jacks and the vacuum pump through a computer system or automatically closing the hydraulic jacks and the vacuum pump by setting numerical values; the respective valves are opened and closed through a computer system; the temperature sensor, the pressure gauge, the gas flowmeter and the liquid flowmeter output the numerical values to the computer system, and the calculation is carried out through the computer system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210978457.4A CN115405286A (en) | 2022-08-16 | 2022-08-16 | Measuring device and measuring method for anisotropic reservoir stress sensitivity |
Applications Claiming Priority (1)
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| CN117054312A (en) * | 2023-08-16 | 2023-11-14 | 东北石油大学 | Rock stress sensitivity anisotropy detection method, system and equipment |
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