WO2023193514A1 - 解吸气量测试装置和测算方法 - Google Patents
解吸气量测试装置和测算方法 Download PDFInfo
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- WO2023193514A1 WO2023193514A1 PCT/CN2023/074685 CN2023074685W WO2023193514A1 WO 2023193514 A1 WO2023193514 A1 WO 2023193514A1 CN 2023074685 W CN2023074685 W CN 2023074685W WO 2023193514 A1 WO2023193514 A1 WO 2023193514A1
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- WIPO (PCT)
- Prior art keywords
- pressure
- desorption
- metering
- desorbed
- gas
- Prior art date
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- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 137
- 238000003795 desorption Methods 0.000 claims abstract description 130
- 238000012544 monitoring process Methods 0.000 claims abstract description 57
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 238000005259 measurement Methods 0.000 claims description 22
- 230000007246 mechanism Effects 0.000 claims description 20
- 238000004364 calculation method Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract 3
- 239000007924 injection Substances 0.000 abstract 3
- 238000004891 communication Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 136
- 239000011521 glass Substances 0.000 description 47
- 230000006872 improvement Effects 0.000 description 11
- 238000000691 measurement method Methods 0.000 description 8
- 238000007872 degassing Methods 0.000 description 7
- 238000003825 pressing Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
Definitions
- the present invention relates to the technical field of unconventional oil and gas exploration and development equipment, and in particular to a desorption gas volume testing device and calculation method.
- Shale gas content evaluation can provide the most direct key parameters for resource evaluation and favorable area selection in the process of shale gas exploration and development, playing an irreplaceable role.
- Gas content testing methods are divided into two categories: direct measurement method and indirect acquisition method (isothermal adsorption and well logging curve method).
- the on-site direct measurement method has the characteristics of high reliability, convenience, economy and speed, and is the best method for determining shale gas content. first choice.
- the instrument used to directly measure the gas content at the drilling coring site is based on two principles: one is the measurement based on the mass flow principle; the second is based on the principle measurement based on the drainage gas collection method.
- the volume measurement during the measurement process must be based on the premise that the gas composition is single or unchanged.
- conversion is required to obtain the measured true volume.
- the gas components will change with the passage of desorption time and a small amount of water vapor will appear, resulting in a large deviation in the measured values, which directly affects the reliability of the measurement results. accuracy.
- the traditional drainage gas collection method can more reliably measure the on-site gas desorption amount.
- instruments based on this principle have been widely used in on-site gas content determination of shale.
- the existing technology discloses a servo motor drive method for measuring the volume of shale desorption gas.
- the servo motor is large and heavy. The number of samples measured by a single instrument is limited, which is time-consuming and labor-intensive. It cannot quickly, conveniently and high-densityly measure shale samples. , cannot adapt to the fast pace of on-site coring work.
- the prior art also discloses an instrument that uses an electronic pressure sensor combined with the height of the water column to calculate the actual volume of gas, thereby realizing the automation of volume measurement and the determination of high-density coring samples. It has the characteristics of high automation, convenience, and speed, but this instrument The technology relies on the gas expansion method to convert the desorption volume. The expansion process is easily affected by temperature, sensor accuracy, etc., and volume measurement is prone to large errors, making it impossible to accurately provide shale gas content data.
- this application proposes a desorption gas volume testing device and a measurement method, which have the characteristics of high degree of automation and can accurately measure the desorption gas volume of shale on site.
- the desorption gas amount testing device of the present invention includes:
- Sample desorption tank used to place the sample to be desorbed and provide a desorption environment for the sample to be desorbed
- the drainage metering assembly includes a metering tube capable of displaying a liquid level value.
- the metering tube receives the gas desorbed from the sample desorption tank, and the metering tube is respectively connected to a drainage assembly for draining water or injecting water, and a monitoring station.
- a first pressure monitoring component for monitoring the liquid pressure in the metering tube
- a second pressure monitoring component for monitoring the gas pressure in the metering tube
- An exhaust assembly is connected to the drainage metering assembly and is used to discharge the desorbed gas in the drainage metering assembly;
- a control system that controls the desorbed gas to enter the metering tube, controls the discharge assembly to discharge water or inject water, and controls the exhaust assembly to discharge desorbed gas;
- the control system controls the speed of the discharge assembly to discharge water to ensure that the second pressure monitoring component is in a pressureless state; when the pressure of the first pressure monitoring component reaches the set value When a certain minimum value is reached, the control system suspends the desorption gas from entering the metering tube, controls the exhaust assembly to exhaust and controls the discharge assembly to inject water into the metering tube until the pressure of the first pressure monitoring part reaches the set maximum value.
- a further improvement of the present invention is that an elastic sleeve is provided in the sample desorption tank, and the elastic sleeve is connected to a pressure-relief mechanism.
- the desorbed sample is pressurized or depressurized; the upper part of the sample desorption tank is provided with a pressing mechanism for tightening the sample to be desorbed.
- a further improvement of the present invention is that the inner wall of the sample desorption tank is provided with an upper fixing ring and a lower fixing ring, the elastic sleeve includes a vertically arranged first rubber sleeve, and the upper end of the first rubber sleeve is provided with a The upper edge is provided with a lower edge at the lower end;
- the upper edge is sealingly connected to the upper fixing ring
- the lower edge is sealingly connected to the lower fixing ring
- an annular space is formed between the inner wall of the desorption tank and the outer wall of the elastic sleeve.
- a pressure relief mechanism is used to pressurize or relieve pressure in the annular space.
- a further improvement of the present invention is that an upper cover is provided on the top of the desorption tank, and the tightening mechanism includes a second rubber cartridge disposed on the upper cover, and is provided between the second rubber cartridge and the upper cover. There is an elastic member, and the elastic member causes the second rubber cartridge to compress the sample to be desorbed through elasticity.
- a further improvement of the present invention is that a plurality of the metering tubes are arranged in parallel in the box, and each metering tube is connected to a sample desorption tank; the upper and lower parts of the box are provided with seals connecting the metering tubes. Joint, the sealing joint on the upper part of the box is provided with a compression spring, and the metering tube is removed through the compression spring.
- a further improvement of the present invention is that the metering tube includes several different types of metering tubes.
- the joints at both ends of the different types of metering tubes are the same, and the diameters of the bodies with scales in the middle are different; during the experiment, different types of metering tubes are replaced according to the experimental accuracy requirements.
- Model metering tube is a further improvement of the present invention.
- a further improvement of the present invention is that the metering tube is provided with an air inlet and outlet and a water inlet, the sample desorption tank is connected to the air inlet and outlet through a first pipeline, and the discharge assembly is connected to the water inlet and outlet;
- the exhaust assembly is connected to the air inlet and outlet through a second pipeline.
- a further improvement of the present invention is that the water inlet and outlet include a water inlet and a water outlet, the drainage assembly includes a water tank, the water tank is connected to the water inlet through a water inlet pipeline, and is connected to the water outlet through a water outlet pipeline;
- an inlet pressure servo valve is provided on the water inlet pipeline, and a drainage pressure servo valve is provided on the drainage pipeline.
- a further improvement of the present invention is that the air inlet and outlet of the metering tube are connected to a tee, and the tee is also connected to the first pipeline and the second pipeline respectively;
- the second pressure monitoring component is provided on the first pipeline, and an air intake valve is provided on the first pipeline; and an exhaust valve is provided on the second pipeline.
- a measurement method uses the desorption gas volume testing device to measure the desorption gas volume of the sample to be desorbed, including the following steps:
- Step 1 Put the sample to be desorbed into a sample desorption tank for heating and desorption;
- Step 2 Transport the desorbed gas into the metering tube, and discharge the water through the discharge assembly while keeping the gas pressure in the metering tube unchanged; when the first pressure monitoring component detects that the liquid pressure in the metering tube reaches the minimum value, Drain the gas in the metering tube and inject water through the discharge assembly to the initial state to complete a cycle;
- Step 3 Calculate the desorption amount in a single cycle
- Step 4 Select the liquid level value in the metering tube at the start time and end time and the number of cycles to calculate the total desorption volume from the start time to the end time.
- Hmax is the maximum liquid level difference of the metering tube
- S is the cross-sectional area of the glass metering tube 5;
- a further improvement of the present invention is that the preset maximum pressure value of the metering tube is Pmax and the minimum pressure value is Pmin; when the water column pressure P monitored by the first pressure monitoring component reaches Pmin, the control system closes the desorption gas and enters the metering tube. Open the exhaust component and control the discharge component to inject water into the metering tube; when the water column pressure P monitored by the first pressure monitoring component reaches Pmax, close the exhaust component, open the desorption gas to enter the metering tube, and control the discharge component from the metering tube. Drain water from the tube.
- S is the cross-sectional area of the metering tube
- ⁇ is the liquid density of the metering tube
- g is the gravity acceleration value.
- the desorbed gas volume can be further converted into the desorbed gas volume under standard conditions based on the temperature and atmospheric pressure recorded at different times.
- the invention provides a desorption gas volume testing device and calculation method, which have at least the following beneficial effects compared with the prior art:
- the desorption gas volume testing device in this application does not need to consider the composition of the desorbed gas, and realizes the automation of volume measurement through changes in liquid level and pressure.
- This measurement method is convenient, fast, and It has small error and high precision, and can accurately measure the desorbed gas content of shale on-site gas content.
- the pressure value and liquid level height value of the water column in the metering tube are measured through the drainage metering component, and the measured pressure value and liquid level height value are substituted into the desorption gas volume measurement formula to calculate the desorption gas volume in a single cycle, and then the calculated The degassing volume in multiple consecutive single cycles is accumulated to obtain the degassing volume of the sample to be desorbed.
- Figure 1 shows a schematic structural diagram of the desorption gas amount testing device of the present invention
- Second pressure monitoring piece 28. Water inlet pipeline; 29. Drainage component; 291. Water tank; 292. Water inlet pipeline; 293. Water outlet pipeline; 294 , Normally open submersible pump; 30. Exhaust assembly; 31. Exhaust pipeline; 41. First control valve; 42. Drainage pressure servo valve; 43. Inlet pressure servo valve; 44. Fourth control valve; 50. Control component; 51. Computer control system; 52. Atmospheric environment sensor; 100. Sample to be desorbed.
- the sample 100 to be desorbed in this application is a shale sample collected from the field, and the desorption gas volume testing device of this application is used for desorption measurement of the gas content of the shale field.
- the present invention provides a desorption gas volume testing device, which includes a sample desorption tank 10, a drainage metering assembly 20, an exhaust assembly 30 and a control system.
- the sample desorption tank 10 is used to place the sample 100 to be desorbed; the drainage metering assembly 20 is connected to the sample desorption tank 10 and is used to measure the desorption gas generated by the sample 100 to be desorbed; the exhaust assembly 30 is connected to the drainage metering assembly 20, and is used to measure the desorption gas generated by the sample 100 to be desorbed.
- the liquid level height value, the first pressure monitoring component 22 can collect the pressure value of the water column in real time.
- a discharge assembly 30 for discharging or injecting water is provided at the bottom of the metering tube 21 , and a second pressure monitoring component 27 is connected to the upper part for monitoring the gas in the metering tube 21 .
- the desorption gas volume testing device in this embodiment also includes a control system, which controls the desorbed gas to enter the metering tube 27, controls the discharge assembly 29 to discharge water or injects water, and controls the exhaust assembly 30 to discharge desorbed gas. .
- the control system controls the discharge group The speed at which the component 29 discharges water keeps the second pressure monitoring component 27 in a pressure-free state (the same as the external environment pressure, and the reading is close to 0); when the pressure of the first pressure monitoring component 22 reaches the set minimum value When A certain maximum value is reached to complete a measurement cycle.
- the control system includes an electronic computer and a control program.
- the desorption gas volume testing device in this application does not need to consider the composition of the desorbed gas, and realizes the automation of volume measurement through changes in liquid level and pressure. This measurement method is convenient, fast, and It has small error and high precision, and can accurately measure the desorbed gas content of shale on-site gas content.
- the sample desorption tank 1 is provided with an elastic sleeve 11.
- the elastic sleeve 11 is connected to a pressure-relief mechanism 12.
- the pressure-relief mechanism 12 passes through the elastic sleeve 11 to the sample desorption tank 1.
- the sample to be desorbed is pressurized or depressurized; the upper part of the sample desorption tank 1 is provided with a pressing mechanism 13 for tightening the sample to be desorbed.
- the sample desorption tank 1 is provided with an elastic sleeve 11.
- the elastic sleeve 11 has an I-shaped vertical cross-section.
- the middle part is a vertical cylindrical first rubber sleeve 111, and the upper and lower sides are horizontally arranged.
- the annular structure forms an upper edge 112 and a lower edge 113.
- An upper fixing ring 142 and a lower fixing ring 143 are provided on the inner wall of the sample desorption tank 1.
- the upper edge of the sample desorption tank 1 is sealingly connected to the upper fixing ring 142, and the lower edge is sealingly connected to the lower fixing ring.
- an annular space is formed between the inner wall of the sample desorption tank 1 and the outer wall of the elastic sleeve 11, and the pressure adding and releasing mechanism 12 pressurizes or releases pressure into the annular space.
- the pressure relief mechanism 12 injects pressure into the annular space, since the first rubber sleeve 111 is elastic, it expands inwardly under the action of pressure, thereby clamping the sample to be desorbed to be tested to adapt to different types of rocks.
- the upper part of the sample desorption tank 1 is provided with a pressing mechanism 13 for tightening the sample to be desorbed.
- the pressing mechanism 13 can press the sample to be desorbed longitudinally.
- the elastic sleeve 11 and the pressing mechanism 13 can be adapted to different specifications and types of rock samples, so that the desorption system can very conveniently reduce the empty volume after the core is canned and can stably fix the core.
- the top of the sample desorption tank 1 is provided with an upper cover 141, and the tightening mechanism 13 includes a
- the second rubber cartridge 131 is placed on the upper cover.
- An elastic member 132 is provided between the second rubber cartridge 131 and the upper cover 141. The elastic member 132 makes the second rubber cartridge 131 elastic. The sample to be desorbed is compacted.
- a condensed water collection assembly 15 is provided on the exhaust pipeline above the sample desorption tank 1, and a liquid receiving tray 16 is provided at the lower end.
- the first pressure monitoring component 22 uses a pressure sensor.
- the metering tube 21 is a glass tube with a fixed scale, which facilitates visual observation of changes in the desorbed gas and liquid level in the glass tube.
- the glass tube can be disassembled and replaced.
- glass tubes of appropriate diameters can be replaced for gas measurement. Data More accurate and reliable.
- a plurality of the metering tubes are arranged in parallel in the box, and each metering tube is connected to a sample desorption tank, so that multiple rock samples can be desorbed at the same time.
- the upper and lower parts of the box are provided with sealing joints connected to the metering tube.
- the sealing joints on the upper part of the box are provided with compression springs. There are embedded O-rings in the sealing joints. The springs hold the glass tube It can be sealed by pressing it up and down. When disassembling, the metering tube is disassembled through the compression spring.
- the compression spring in this embodiment is more convenient and faster to disassemble and install than threads or clamps.
- the metering tube includes several different types of metering tubes.
- the joints at both ends of different types of metering tubes are the same, and the diameters of the bodies with scales in the middle are different; during the experiment, different types of metering tubes are replaced according to the experimental accuracy requirements. .
- the metering tube can be replaced with a thinner one, so that the liquid level changes more obviously, thus improving the accuracy.
- the models of glass tubes are A, B, C, etc.
- glass tube A is connected to the device, while glass tubes B and C are not connected to the device.
- the metering pipe 21 is provided with an air inlet and outlet 211 and a drainage outlet 212.
- the drainage metering assembly 20 also includes a tee 23, a first pipeline 24, a first control valve 41 and Second pipeline 25.
- the tee 23 has a first inlet and outlet 231, a second inlet and outlet 232 and a third inlet and outlet 233.
- the third inlet and outlet 233 is connected with the exhaust assembly 30; one end of the first pipeline 24 is connected with the sample desorption tank 10. The other end is connected to the first inlet and outlet 231; the first control valve 41 is provided on the first pipeline 24; one end of the second pipeline 25 is connected to the air inlet and outlet 211, and the other end is connected to the second inlet and outlet 232.
- the first pipeline 24 and the second pipeline 25 are air inlet pipelines, through which the desorbed gas generated in the sample desorption tank 10 can be drained and collected through the metering tube 21 .
- the first control valve 41 is an electromagnetic normally open valve.
- the drainage metering assembly 20 further includes a drainage pipeline 26 and a drainage pressure servo valve 42 .
- one end of the drainage pipeline 26 is connected to the drainage port 212; the drainage pressure servo valve 42 is provided on the drainage pipeline 26.
- the drainage pipe 26 can drain the water in the metering pipe 21, thereby ensuring that the metering pipe 21 can collect the desorbed gas. This ensures that the drainage and gas collection function of the desorption gas volume testing device can be realized.
- the drain pressure servo valve 42 is a pressure servo valve.
- a second pressure monitoring component 27 is provided on the first pipeline 24 .
- the second pressure monitoring component 27 is located between the first control valve 41 and the tee 23 .
- the pressure servo valve 42 can control the drainage rate of the drainage pipeline 26 according to the pressure value monitored by the second pressure monitoring component 27 .
- the drainage pressure servo valve 42 can control the drainage rate of the drainage pipeline 26 according to the pressure value monitored by the second pressure monitoring component 27, the liquid discharge in the metering pipe 21 is controlled by opening the pressure servo valve to varying degrees.
- the second pressure monitoring part 27 is placed in a non-pressure state, thereby ensuring that the first pressure monitoring part 22 is not affected by desorption under pressure, and the pressure of the water column in the metering tube 21 is accurately collected, thereby ensuring that the subsequent desorption can be accurately measured.
- the amount of desorbed gas of sample 100 is thereby ensuring that the first pressure monitoring part 22 is not affected by desorption under pressure, and the pressure of the water column in the metering tube 21 is accurately collected, thereby ensuring that the subsequent desorption can be accurately measured.
- the glass tube can be disassembled and replaced.
- glass tubes of appropriate diameters can be replaced for gas measurement. Data More accurate and reliable.
- the models of glass tubes are A, B, C, etc.
- glass tube A is connected to the device, while glass tubes B and C are not connected to the device.
- the metering pipe 21 is provided with an air inlet and outlet 211 and a drainage outlet 212.
- the drainage metering assembly 20 also includes a tee 23, a first pipeline 24, a first control valve 41 and Second pipeline 25.
- the tee 23 has a first inlet and outlet 231, a second inlet and outlet 232 and a third inlet and outlet 233.
- the third inlet and outlet 233 is connected with the exhaust assembly 30; one end of the first pipeline 24 is connected with the sample desorption tank 10.
- the other end is connected to the first inlet and outlet 231; the first control valve 41 is provided on the first pipeline 24; one end of the second pipeline 25 is connected to the air inlet and outlet 211, and the other end is connected to the second inlet and outlet.
- the first pipeline 24 and the second pipeline 25 are air inlet pipelines, through which the desorbed gas generated in the sample desorption tank 10 can be drained and collected through the metering tube 21 .
- the first control valve 41 is an electromagnetic normally open valve.
- the drainage metering assembly 20 further includes a drainage pipeline 26 and a drainage pressure servo valve 42 .
- one end of the drainage pipeline 26 is connected to the drainage port 212; the drainage pressure servo valve 42 is provided on the drainage pipeline 26.
- the drainage pipe 26 can drain the water in the metering pipe 21, thereby ensuring that the metering pipe 21 can collect the desorbed gas. This ensures that the drainage and gas collection function of the desorption gas volume testing device can be realized.
- the drain pressure servo valve 42 is a pressure servo valve.
- a second pressure monitoring component 27 is provided on the first pipeline 24 .
- the second pressure monitoring component 27 is located between the first control valve 41 and the tee 23 .
- the pressure servo valve 42 can control the drainage rate of the drainage pipeline 26 according to the pressure value monitored by the second pressure monitoring component 27 .
- the drainage pressure servo valve 42 can control the drainage rate of the drainage pipeline 26 according to the pressure value monitored by the second pressure monitoring component 27, the liquid discharge in the metering pipe 21 is controlled by opening the pressure servo valve to varying degrees.
- the second pressure monitoring part 27 is placed in a non-pressure state, thereby ensuring that the first pressure monitoring part 22 is not affected by desorption under pressure, and the pressure of the water column in the metering tube 21 is accurately collected, thereby ensuring that the subsequent desorption can be accurately measured.
- the amount of desorbed gas of sample 100 is thereby ensuring that the first pressure monitoring part 22 is not affected by desorption under pressure, and the pressure of the water column in the metering tube 21 is accurately collected, thereby ensuring that the subsequent desorption can be accurately measured.
- the second pressure monitoring component 27 uses a pressure sensor.
- the metering pipe 21 is provided with a water inlet 213
- the drainage metering assembly 20 further includes a water inlet pipeline 28 and an inlet water pressure servo valve 43 .
- one end of the water inlet pipe 28 is connected to the water inlet 213; the water inlet pressure servo valve 43 is provided on the water inlet pipe 28.
- the water inlet pipe 28 can pass water into the metering tube 21 to ensure that there is enough water in the metering tube 21, thereby ensuring that the metering tube 21 can collect the desorbed gas through drainage and gas collection.
- the inlet water pressure servo valve 43 adopts a pressure servo valve.
- the drainage metering assembly 20 further includes a discharge assembly 29 , and the discharge assembly 29 is connected to the other end of the water inlet pipeline 28 .
- the drainage assembly 29 can provide a water source for the metering pipe 21 to ensure that the water inlet pipeline 28 Enough water can be introduced into the metering tube 21 to ensure that the metering tube 21 can collect the desorbed gas through drainage and gas collection.
- the drainage assembly 29 includes a water tank 291 , a water inlet pipe 292 and a water outlet pipe 293 .
- One end of the water inlet pipe 292 is connected to the water tank 291 , and the other end is connected to the other end of the water inlet pipe 28 ; one end of the water outlet pipe 293 is connected to the water tank 291 , and the other end is connected to the other end of the drainage pipe 26 .
- the water outlet pipe 293 is connected to the drainage pipe 26 .
- the drainage pressure servo valve 42 when water enters the drainage assembly 29, the drainage pressure servo valve 42 is in a closed state, the water inlet pressure servo valve 43 is in an open state, and the normally open submersible pump 294 pressurizes, so that water can be injected into the metering pipe 21.
- the drain assembly 29 drains water
- the drain pressure servo valve 42 is in an open state
- the water inlet pressure servo valve 43 is in a closed state.
- a normally open submersible pump 294 is provided in the water tank 291 for pumping water in the water tank 291 into the metering pipe 21 .
- the exhaust assembly 30 includes an exhaust pipeline 31 and a fourth control valve 44 .
- One end of the exhaust pipe 31 is connected to the drainage metering assembly 20 , and the fourth control valve 44 is provided on the exhaust pipe 31 .
- the exhaust pipe 31 can pass the desorbed gas collected in the metering tube 21 into an external desorbed gas collection device.
- the fourth control valve 44 adopts an electromagnetic purge valve.
- the desorption gas volume testing device further includes a control component 50 , and the control component 50 is electrically connected to the drainage metering component 20 and the exhaust component 30 .
- control component 50 includes a computer control system 51 and an atmospheric environment sensor 52 .
- the atmospheric environment sensor 52 adopts a set of temperature and pressure sensors. It is electrically connected to the computer control system 51 and is used to feedback the pressure and temperature of the external environment of the device.
- the computer control system 51 is also electrically connected to the first control valve 41, the drainage pressure servo valve 42, the inlet pressure servo valve 43, the fourth control valve 44, the first pressure monitoring component 22 and the second pressure monitoring component 27, and can receive the third a pressure monitoring piece 22 and the The pressure information fed back by the second pressure monitoring component 27 can also control the action of the above control valve.
- the present invention also provides a calculation method.
- the calculation method is used to calculate the degassing amount of the sample 100 to be desorbed, and includes the following steps:
- Step 1 Put the sample to be desorbed into the sample desorption tank for heating and desorption;
- Step 2 Measure the pressure value of the water column in the metering tube through the drainage metering component, and display the liquid level height of the water column in the metering tube;
- Step 3 Calculate the desorbed gas volume in a single cycle according to the desorbed gas volume calculation formula
- Step 4 Calculate the desorbed gas volume in multiple consecutive single cycles based on steps 2 and 3;
- Step 5 Accumulate the desorbed gas volumes in multiple consecutive single cycles to obtain the degassed volume of the sample to be desorbed.
- T the desorption time of the sample 100 to be desorbed
- T includes multiple consecutive time periods T1 (single period), for example, T1 can be set to 30 Second.
- the desorbed gas amount testing device of the present application can measure the desorbed gas amount in multiple consecutive single cycles, and the desorbed gas amount of the sample 100 to be desorbed can be obtained by accumulating the desorbed gas amounts in multiple consecutive single cycles.
- the invention includes a sealed sample desorption tank 10.
- the on-site core shale sample is put into the sample desorption tank 10 for heating and desorption.
- the upper end of the sample desorption tank 10 is connected to an electromagnetic normally open valve for controlling the inside of the sample desorption tank 10.
- the desorbed gas flows out and is closed.
- a tee 23 is connected behind the electromagnetic normally open valve, which is connected to the sample desorption tank 10, the metering tube 21 and the electromagnetic release valve respectively.
- the upper end of the glass tube is connected to an electromagnetic release valve.
- the electromagnetic release valve is used to discharge the desorption gas in the sample desorption tank 10 collected in the glass tube.
- the bottom of the glass tube is provided with a pressure sensor at the bottom of the water column.
- the purpose of the pressure sensor at the bottom of the water column is to real-time Measure the pressure of the water column in the glass tube.
- the lower end of the glass tube is connected to a pressure servo valve for drainage. It is controlled by the gas pressure sensor. It can open the valve to varying degrees according to the pressure of the desorbed gas at the gas pressure sensor, thereby controlling the outflow of the liquid in the glass tube. .
- the other end of the pressure servo valve for drainage is connected with a connecting pipe (outlet pipe 293) and communicates with the bottom of the water tank 291.
- a connecting pipe outlet pipe 293
- the pressure servo valve for drainage opens.
- the liquid in the glass tube flows into the water tank 291 through the connecting tube to achieve pressure-free drainage and gas collection.
- the liquid in the glass tube is not completely filled with the glass tube.
- the liquid level is controlled by the high-precision water column bottom pressure sensor (first pressure monitoring component 22) set at the bottom.
- the water column pressure is Pmax.
- the calibration is performed at this time.
- the water column pressure is Pmin.
- the liquid level difference between the highest (D) and lowest (E) liquid levels in the glass tube is calibrated as Hmax; and the inner diameter area S of the glass tube is a fixed value, so the maximum liquid that can be discharged in the glass tube in a single cycle is
- the computer control system 51 automatically controls the closing of the electromagnetic normally open valve, opens the electromagnetic vent valve for deflation, and at the same time controls the opening of the pressure servo valve for water inlet at the lower end of the glass tube.
- the normally open submersible pump 294 in the water tank 291 pumps the water in the water tank 291 into the glass tube through the connecting pipe, so that the liquid level in the glass tube returns to the highest liquid level value D, the electromagnetic release valve is closed, and the normally open solenoid valve is opened.
- the device of the present invention realizes the gas collection of the drainage gas collection method.
- the desorption gas pressure sensor is linked with the pressure servo valve to avoid pressure measurement.
- the desorption gas is measured directly through the reading of the pressure sensor at the bottom of the water column. Small size, small data error, high reliability, stability and reliability.
- a gas pressure sensor is provided between the electromagnetic normally open valve and the tee 23.
- the purpose of the gas pressure sensor is to be able to measure the pressure of the gas flowing through the gas pressure sensor. When the pressure is greater than 0, it can desorb the gas along with the gas pressure sensor. Open the valve to different degrees of pressure to eliminate the error in the data at the pressure sensor at the bottom of the water column caused by the gas pressure in the glass tube. Therefore, the real water column pressure data obtained by the pressure sensor at the bottom of the water column is integrated into the formula to directly obtain the gas desorption amount, and the data obtained is more stable and reliable.
- the computer control system 51 includes an atmospheric environment sensor 52 and a computer control system 51.
- the atmospheric environment sensor 52 is responsible for collecting ambient temperature and atmospheric pressure values.
- the computer control system 51 can integrate and control the electromagnetic normally open valve, the electromagnetic air release valve, the pressure sensor at the bottom of the water column, the pressure servo valve for inlet and drainage, and the gas pressure sensor to collect real-time data. Therefore, the automated control required for the device of the invention is achieved.
- each glass tube is equipped with a separate solenoid normally open valve, solenoid bleed valve, pressure sensor at the bottom of the water column, drain, water inlet for pressure servo valve and gas
- the pressure sensor forms a separate metering unit and a single sample 100 to be desorbed.
- the water tank 291 can be connected to multiple metering units through the connecting pipe and the normally open submersible pump 294.
- the design of this structure can simultaneously analyze multiple samples 100 to be desorbed, and can efficiently and conveniently complete high-density, fast-paced processes. Coring evaluation work.
- the on-site desorption capacity measurement method using an on-site desorption capacity measurement device will be specifically described below, including the following steps:
- Step A The instrument is initialized, and the computer automatically controls the opening of the water inlet pressure servo valve, so that the water level in the glass tube is calibrated to the maximum liquid level height D value, the electromagnetic release valve is closed, and the computer control system records the temperature and pressure at the atmospheric environment sensor;
- Step B Place the shale sample in a sealed sample desorption tank, and the desorbed gas after heating enters the glass tube through the electromagnetic normally open valve and tee;
- Step C The gas pressure sensor located between the electromagnetic normally open valve and the tee collects the desorption gas pressure in real time.
- the computer automatically controls the opening of the pressure servo valve for drainage at the lower end of the glass tube.
- the pressure servo valve for drainage is opened to varying degrees to control the liquid in the glass tube to enter the connecting pipe and then be discharged into the water tank, so that the gas pressure sensor remains in a pressureless state.
- the pressure sensor at the bottom of the water column collects the water column pressure P water in real time;
- the computer automatically controls to close the electromagnetic normally open valve, open the electromagnetic vent valve to deflate, and at the same time control
- the pressure servo valve for water inlet at the lower end of the glass tube opens, and the liquid in the water tank is pumped into the glass tube through a normally open submersible pump;
- Step E When the liquid level in the glass tube returns to the maximum set liquid level D and the pressure value at the gas pressure sensor is 0, return to the initial state, close the electromagnetic release valve, open the electromagnetic normally open valve, and start the next desorption cycle;
- Step F Calculate the desorbed gas volume based on the real-time pressure measured by the pressure sensor at the bottom of the water column.
- step F How to calculate the desorbed gas amount in step F will be explained in detail below.
- Hmax is the maximum liquid level difference Hmax of the calibrated glass tube
- S is the cross-sectional area of the glass tube
- Pmax and Pmin are the pressure values at the pressure sensor when the liquid level of the glass metering tube is preset to the maximum (D) and minimum height (E) respectively
- S is the area of the cross-section inside the glass metering tube
- ⁇ is the liquid density of the glass metering tube
- g is Gravity acceleration value.
- the desorbed gas volume can be further converted into the desorbed gas volume under standard conditions based on the temperature and atmospheric pressure recorded at different times.
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Abstract
一种解吸气量测试装置和测算方法，装置包括样品解吸罐（10），用于放置待解吸样品（100）并为待解吸样品（100）提供解吸的环境；排水计量组件（20），包括能够显示液位高度值的计量管（21），用于接收样品解吸罐（10）解吸出的气体，并且，计量管分别连接排出水或注入水的排注组件（29）、监测计量管内的液体压力的第一压力监测件（22），以及监测计量管内的气体压力的第二压力监测件（27）；排气组件（30），与排水计量组件（20）连通，用于排放排水计量组件（20）内的解吸气；以及控制组件（50），解吸的气体进入计量管（21）内后，根据第二压力监测件（27）控制排注组件（29）以恒定的气压排出水，并控制排气组件（30）排出气体同时控制所述排注组件注入水，从而测算解吸气量。
Description
本发明涉及非常规油气勘探开发设备技术领域，特别地涉及一种解吸气量测试装置和测算方法。
页岩气作为清洁能源，国内在页岩气领域已取得了巨大的突破和商业开发，其勘探开发受到了广泛关注。页岩含气量评价能为页岩气勘探开发过程中资源评价及有利区优选提供最为直接的关键性参数，显现出了不可替代的作用。含气量测试的方法分为直接测定法和间接获得法(等温吸附和测井曲线法)两类，现场直接测定法具备可信度高、方便、经济、快捷等特点，是页岩含气量测定的首选。
用于钻井取心现场直接测定含气量仪器基于两种原理：一种是质量流量原理计量；第二种采用排水集气法原理计量。前者在计量过程中计量体积需以气体组成单一或组成不变为前提，对于测量不同的气体，需经过换算才能得到测定的真实体积。特别是，页岩样品在现场解吸过程中气体组分会随着解吸时间的推移发生变化以及伴有少量水蒸气出现，导致其测量值将会发生较大偏离，直接影响了测量结果的可靠性、准确性。
相比前者，传统排水集气法可较为可靠地测定现场气体解吸量。目前，基于此原理的仪器已广泛用于页岩现场含气量测定工作。现有技术公开了一种以伺服电机传动实现页岩解吸气体体积测定，但伺服电机体积大，质量重，单台仪器测量样品数量有限，费时费力，无法快速、便捷、高密度测定页岩样品，不能适应快速的现场取芯工作节奏。现有技术还公开了一种以电子压力传感器与水柱高度相结合计算气体实际体积，实现体积计量的自动化以及高密度取心样品的测定的仪器，具有自动化高、方便、快捷等特点，但是该技术需依赖气体膨胀法来换算解吸体积，膨胀过程易受温度、传感器精度等影响，体积计量容易出现较大误差，无法精确的提供页岩含气量数据。
由上可知，目前用于页岩现场含气量解吸气量测定装置和方法多存在一定问题，无法方便、快捷地获取准确度、可信度高的现场数据。
以上也就是说，亟待开发一种自动化程度高且能精确测定页岩现场解吸气量的测试装置，适应快速、高节奏的现场取芯解吸气量的评价工作。
发明内容
针对上述现有技术中的问题，本申请提出了一种解吸气量测试装置和测算方法，具有自动化程度高且能精确测定页岩现场解吸气量的特点。
本发明的解吸气量测试装置，包括：
样品解吸罐，用于放置待解吸样品并为待解吸样品提供解吸的环境；
排水计量组件，包括能够显示液位高度值的计量管，所述计量管接收所述样品解吸罐解吸出的气体，并且，所述计量管分别连接排出水或注入水的排注组件、监测所述计量管内的液体压力的第一压力监测件，以及监测所述计量管内的气体压力的第二压力监测件；
排气组件，与所述排水计量组件连通，用于排放所述排水计量组件内的解吸气；以及
控制系统，控制解吸的气体进入所述计量管，控制所述排注组件排出水或注入水，以及控制所述排气组件排出解吸气；
其中，当解吸气体进入所述计量管时，控制系统控制所述排注组件排出水的速度，保证所述第二压力监测件处于无压状态；当所述第一压力监测件的压力达到设定的最小值时，所述控制系统暂停解吸气体进入计量管，控制所述排气组件排气并控制所述排注组件向所述计量管内注入水，直到所述第一压力监测件的压力达到设定的最大值。
本发明的进一步改进在于，所述样品解吸罐内设置有弹性套筒，所述弹性套筒连接加泄压机构，所述加泄压机构通过所述弹性套筒向所述解吸罐内的待解吸样品加压或泄压；所述样品解吸罐的上部设置有加紧所述待解吸样品的压紧机构。
本发明的进一步改进在于，所述样品解吸罐的内壁上设置有上固定圈和下固定圈，所述弹性套筒包括竖直设置的第一胶套，所述第一胶套的上端设置有上边沿，下端设置有下边沿；
所述上边沿密封连接在所述上固定圈上，所述下边沿密封连接在所述下固定圈上，所述解吸罐的内壁与所述弹性套筒的外壁之间形成环形空间，所述加泄压机构向所述环形空间内加压或泄压。
本发明的进一步改进在于，所述解吸罐的顶部设置有上盖，所述加紧机构包括设置在所述上盖上的第二胶筒，所述第二胶筒与所述上盖之间设置有弹性件，所述弹性件通过弹性使所述第二胶筒压紧所述待解吸样品。
本发明的进一步改进在于，多个所述计量管并联设置在箱体内，每个所述计量管分别连接一个样品解吸罐；所述箱体内的上部和下部分设置有连接所述计量管的密封接头，所述箱体上部的密封接头上设置有压紧弹簧，通过所述压紧弹簧拆卸所述计量管。
本发明的进一步改进在于，所述计量管包括若干不同型号的计量管，不同型号的计量管的两端的接头相同，中部带有刻度的主体的直径不同；在实验时，根据实验精度要求更换不同型号的计量管。
本发明的进一步改进在于，所述计量管设置有进出气口和进出水口，所述样品解吸罐通过第一管路连接所述进出气口，所述排注组件连接所述进出水口；
所述排气组件通过第二管线连接所述进出气口。
本发明的进一步改进在于，所述进出水口包括进水口和出水口，所述排注组件包括水箱，所述水箱通过进水管线连接所述进水口，并且通过出水管线连接所述出水口；
其中，所述进水管线上设置有进水压力伺服阀，所述排水管线上设置有排水压力伺服阀。
本发明的进一步改进在于，所述计量管的进出气口连接有三通，所述三通还分别连接第一管路和第二管路；
所述第二压力监测件设置在所述第一管路上，并且所述第一管路上设置有进气阀；所述第二管路上设置有排气阀。
根据本发明的另一个方面，还提出了一种测算方法，所述测算方法使用所述的解吸气量测试装置测算待解吸样品的解吸气量，包括以下步骤：
步骤一，将所述待解吸样品放入样品解吸罐内进行加热解吸；
步骤二，将解吸的气体输送到计量管内，在保持计量管内的气体压力不变的同时通过排注组件排出水；当第一压力监测件监测到所述计量管内的液体压力到达最小值时，排出计量管内的气体并通过排注组件注入水到初始状态，从而完成一次循环周期；
步骤三，计算单次循环周期的解吸量；
步骤四，选取开始时间和结束时间时计量管内的液面值以及循环周期次数计算开始时间到结束时间的总解吸量。
本发明的进一步改进在于，单次循环的解吸量下式计算：
Vmax＝HmaxS
Vmax＝HmaxS
其中，Hmax为计量管最大液位差，S为玻璃计量管5内横截面的面积；
本发明的进一步改进在于，所述计量管预设的最大压力值为Pmax，最小压力值为Pmin；当第一压力监测件监测的水柱压力P到达Pmin时控制系统关闭解吸气进入计量管，打开排气组件并控制排注组件向计量管内注入水；当第一压力监测件监测的水柱压力P到到达Pmax时，关闭排气组件，打开解吸气进入计量管并控制排注组件从计量管内排出水。
本发明的进一步改进在于，任意两个时刻T1和T2，水柱压力读数分别为P1和P2，两次测量间隔内玻璃计量管排出气体n次，则两次计量间隔内解吸气量为：
V＝(P1-Pmin+Pmax-P2)S/ρg+nVmax
V＝(P1-Pmin+Pmax-P2)S/ρg+nVmax
其中，S为计量管内横截面的面积，ρ为计量管液体密度，g为重力加速度值。可进一步根据不同时间记录的温度和大气压，将解吸气量转化为标准状态下的解吸气量。
上述技术特征可以各种适合的方式组合或由等效的技术特征来替代，只要能够达到本发明的目的。
本发明提供的一种解吸气量测试装置和测算方法，与现有技术相比，至少具备有以下有益效果：
与相关技术中的解吸气量测试装置和测算方法相比，本申请中的解吸气量测试装置无需考虑解吸气体组成，通过液位压力变化来实现了体积计量的自动化，该计量方式方便、快捷，而且误差小、精度高，能准确测定页岩现场含气量的解吸气量。通过排水计量组件测量出计量管内水柱的压力值和液位高度值，并将测量出的压力值和液位高度值代入解吸气量测算公式，从而计算出单周期的解吸气量，进而将计算出的多个连续的单周期内的解吸气量累加以得到待解吸样品的解气量。
在下文中将基于实施例并参考附图来对本发明进行更详细的描述。其中：图
1显示了本发明的解吸气量测试装置的结构示意图；
在附图中，相同的部件使用相同的附图标记。附图并未按照实际的比例。附图标记：
10、样品解吸罐；11、弹性套筒；111、第一胶套；112、上边沿；113、下边沿；12、加泄压机构；13、压紧机构；131、第二胶筒；132、弹性件；141、上盖；142、上固定圈；143、下固定圈；15、冷凝水收集组件；16、液体盛接盘；20、排水计量组件；21、计量管；211、进出气口；212、排水口；213、进水口；22、第一压力监测件；23、三通；231、第一进出口；232、第二进出口；233、第三进出口；24、第一管路；25、第二管路；26、排水管路；27、第二压力监测件；28、进水管路；29、排注组件；291、水箱；292、进水管道；293、出水管道；294、常开潜水泵；30、排气组件；31、排气管路；41、第一控制阀；42、排水压力伺服阀；43、进水压力伺服阀；44、第四控制阀；50、控制组件；51、电脑控制系统；52、大气环境传感器；100、待解吸样品。
下面将结合附图对本发明作进一步说明。
需要说明的是，本申请中的待解吸样品100为从现场采集的页岩样品，本申请的解吸气量测试装置用于页岩现场含气量的解吸测量。
如图1所示，本发明提供了一种解吸气量测试装置，其包括样品解吸罐10、排水计量组件20、排气组件30和控制系统。
其中，样品解吸罐10用于放置待解吸样品100；排水计量组件20与样品解吸罐10连通，用于测量待解吸样品100产生的解吸气；排气组件30与排水计量组件20连通，用于排放排水计量组件20内的解吸气；排水计量组件20包括计量管21和设置在计量管21底部的第一压力监测件22，其中所用计量管21用于计量所述计量管21内水柱的液位高度值，第一压力监测件22能够实时采集水柱的压力值。计量管21的底部设置有用于排出水或注入水的排注组件30，上部连接有第二压力监测件27，用于监测所述计量管21内的气体。
本实施例所述解吸气量测试装置还包括控制系统，控制解吸的气体进入所述计量管27，控制所述排注组件29排出水或注入水，以及控制所述排气组件30排出解吸气。其中，当解吸气体进入所述计量管21时，控制系统控制所述排注组
件29排出水的速度，使所述第二压力监测件27保持无压力状态(与外界环境压力相同，读数接近为0)；当所述第一压力监测件22的压力达到设定的最小值时，所述控制系统暂停解吸气体进入计量管21，控制所述排气组件排气并控制所述排注组件向所述计量管内注入水，直到所述第一压力监测件21的压力达到设定的最大值，从而完成一次测量周期。在本实施例中，所述控制系统包括电子计算机和控制程序。
上述设置中，通过排水计量组件测量出计量管21内水柱的压力值和液位高度值，并将测量出的压力值和液位高度值代入解吸气量测算公式，从而计算出单周期的解吸气量，进而将计算出的多个连续的单周期内的解吸气量累加以得到待解吸样品100的解气量。与相关技术中的解吸气量测试装置和测算方法相比，本申请中的解吸气量测试装置将无需考虑解吸气体组成，通过液位压力变化实现了体积计量的自动化，该计量方式方便、快捷，而且误差小、精度高，能准确测定页岩现场含气量的解吸气量。
所述样品解吸罐1内设置有弹性套筒11，所述弹性套筒11连接加泄压机构12，所述加泄压机构12通过所述弹性套筒11向所述样品解吸罐1内的待解吸样品加压或泄压；所述样品解吸罐1的上部设置有加紧所述待解吸样品的压紧机构13。
具体地，所述样品解吸罐1内设置有弹性套筒11，弹性套筒11的竖向截面工字型，中部是竖直的圆筒形的第一胶套111，上下两侧是水平设置的环形结构，形成上边沿112和下边沿113。在样品解吸罐1的内壁上设置有上固定圈142和下固定圈143，样品解吸罐1的上边沿密封连接在所述上固定圈上142，所述下边沿密封连接在所述下固定圈143上，所述样品解吸罐1的内壁与所述弹性套筒11的外壁之间形成环形空间，所述加泄压机构12向所述环形空间内加压或泄压。加泄压机构12向环形空间内注入压力时，由于第一胶套111是具有弹性的，在压力的作用下向内侧膨胀，从而夹紧待测的待解吸样品，以适应不同型号的岩石。
所述样品解吸罐1的上部设置有加紧所述待解吸样品的压紧机构13。压紧机构13能够从纵向压紧待解吸样品。通过弹性套筒11和压紧机构13能够适应针对不同规格、不同类型岩石样品，使得解吸系统能够十分便捷地缩减岩心装罐之后的空体积且能够稳定地固定住岩心。
具体地，所述样品解吸罐1的顶部设置有上盖141，所述加紧机构13包括设
置在所述上盖上的第二胶筒131，所述第二胶筒131与所述上盖141之间设置有弹性件132，所述弹性件132通过弹性使所述第二胶筒131压紧所述待解吸样品。
此外，样品解吸罐1的上方的排气管线上还设置有冷凝水收集组件15，下端设置有液体盛接盘16。
具体地，在一个实施例中，第一压力监测件22采用压力传感器。
具体地，在一个实施例中，计量管21为带固定刻度的玻璃管，便于直观地观察玻璃管内的解吸气体与液位的变化。
具体地，如图1所示，在一个实施例中，玻璃管在本实施例中可以进行拆卸和更换，针对不同解吸量、解吸速率的样品可更换相适应直径的玻璃管用于气体计量，数据更加精准、可靠。
具体的，多个所述计量管并联设置在箱体内，每个所述计量管分别连接一个样品解吸罐，这样，可同时对多个岩石样品进行解吸。所述箱体内的上部和下部分设置有连接所述计量管的密封接头，所述箱体上部的密封接头上设置有压紧弹簧，密封接头里面有内嵌的O型圈，弹簧把玻璃管上下压紧即可密封，拆卸时通过所述压紧弹簧拆卸所述计量管。本实施例中的压紧弹簧相比于螺纹或卡箍等拆卸和安装更加方便快捷。
优选地，所述计量管包括若干不同型号的计量管，不同型号的计量管的两端的接头相同，中部带有刻度的主体的直径不同；在实验时，根据实验精度要求更换不同型号的计量管。当气量小时，可以换细的计量管，液位变化更为明显，从而提高精度。
具体地，如图1所示，在一个实施例中，玻璃管的型号为A、B和C等。其中玻璃管A接入装置，玻璃管B、C等未接入装置，本申请中可根据待解吸样品100的实际解气量和速率，择一选择。
具体地，如图1所示，在一个实施例中，计量管21设置有进出气口211和排水口212，排水计量组件20还包括三通23、第一管路24、第一控制阀41和第二管路25。其中，三通23具有第一进出口231、第二进出口232和第三进出口233，第三进出口233与排气组件30连通；第一管路24的一端与样品解吸罐10连接，其另一端与第一进出口231连接；第一控制阀41设置在第一管路24上；第二管路25的一端与进出气口211连接，其另一端与第二进出口232连接
上述设置中，第一管路24和第二管路25为进气管路，通过进气管路能够将样品解吸罐10中产生的解吸气通过计量管21内进行排水集气。
具体地，在一个实施例中，第一控制阀41为电磁常开阀。
具体地，如图1所示，在一个实施例中，排水计量组件20还包括排水管路26和排水压力伺服阀42。其中，排水管路26的一端与排水口212连接；排水压力伺服阀42设置在排水管路26上。
上述设置中，排水管路26能够将计量管21内的水排出，进而确保计量管21能够收集到解吸气。进而确保解吸气量测试装置的排水集气功能得以实现。
具体地，在一个实施例中，排水压力伺服阀42为压力伺服阀。
具体地，如图1所示，在一个实施例中，第一管路24上设置有第二压力监测件27，第二压力监测件27位于第一控制阀41和三通23之间，排水压力伺服阀42能够根据第二压力监测件27监测到的压力值控制排水管路26的排水速率。
上述设置中，由于排水压力伺服阀42能够根据第二压力监测件27监测到的压力值控制排水管路26的排水速率，这样通过压力伺服阀不同程度的开启控制计量管21内的液体排出，使第二压力监测件27处于无压状态，从而确保第一压力监测件22不受带压解吸的影响，准确地采集计量管21内水柱的压力大小，进而确保后续能够准确地测算出待解吸样品100的解吸气量。
具体地，如图1所示，在一个实施例中，玻璃管在本实施例中可以进行拆卸和更换，针对不同解吸量、解吸速率的样品可更换相适应直径的玻璃管用于气体计量，数据更加精准、可靠。
具体地，如图1所示，在一个实施例中，玻璃管的型号为A、B和C等。其中玻璃管A接入装置，玻璃管B、C等未接入装置，本申请中可根据待解吸样品100的实际解气量和速率，择一选择。
具体地，如图1所示，在一个实施例中，计量管21设置有进出气口211和排水口212，排水计量组件20还包括三通23、第一管路24、第一控制阀41和第二管路25。其中，三通23具有第一进出口231、第二进出口232和第三进出口233，第三进出口233与排气组件30连通；第一管路24的一端与样品解吸罐10连接，其另一端与第一进出口231连接；第一控制阀41设置在第一管路24上；第二管路25的一端与进出气口211连接，其另一端与第二进出
口232连接
上述设置中，第一管路24和第二管路25为进气管路，通过进气管路能够将样品解吸罐10中产生的解吸气通过计量管21内进行排水集气。
具体地，在一个实施例中，第一控制阀41为电磁常开阀。
具体地，如图1所示，在一个实施例中，排水计量组件20还包括排水管路26和排水压力伺服阀42。其中，排水管路26的一端与排水口212连接；排水压力伺服阀42设置在排水管路26上。
上述设置中，排水管路26能够将计量管21内的水排出，进而确保计量管21能够收集到解吸气。进而确保解吸气量测试装置的排水集气功能得以实现。
具体地，在一个实施例中，排水压力伺服阀42为压力伺服阀。
具体地，如图1所示，在一个实施例中，第一管路24上设置有第二压力监测件27，第二压力监测件27位于第一控制阀41和三通23之间，排水压力伺服阀42能够根据第二压力监测件27监测到的压力值控制排水管路26的排水速率。
上述设置中，由于排水压力伺服阀42能够根据第二压力监测件27监测到的压力值控制排水管路26的排水速率，这样通过压力伺服阀不同程度的开启控制计量管21内的液体排出，使第二压力监测件27处于无压状态，从而确保第一压力监测件22不受带压解吸的影响，准确地采集计量管21内水柱的压力大小，进而确保后续能够准确地测算出待解吸样品100的解吸气量。
具体地，在一个实施例中，第二压力监测件27采用压力传感器。
具体地，如图1所示，在一个实施例中，计量管21设置有进水口213，排水计量组件20还包括进水管路28和进水压力伺服阀43。
其中，进水管路28的一端与进水口213连接；进水压力伺服阀43设置在进水管路28上。
上述设置中，进水管路28能够向计量管21通入水，以确保计量管21内有足够的水，从而确保计量管21能够通过排水集气的方法收集解吸气。
具体地，在一个实施例中，进水压力伺服阀43采用压力伺服阀。
具体地，如图1所示，在一个实施例中，排水计量组件20还包括排注组件29，排注组件29与进水管路28的另一端连通。
上述设置中，排注组件29能够为计量管21提供水源，以确保进水管路28
能够向计量管21内通入足够的水，从而确保计量管21能够通过排水集气的方法收集解吸气。
具体地，如图1所示，在一个实施例中，排注组件29包括水箱291、进水管道292和出水管道293。
其中，进水管道292的一端与水箱291连接，另一端与进水管路28的另一端连接；出水管道293的一端与水箱291连接，另一端与排水管路26的另一端连接。
具体地，如图1所示，在一个实施例中，出水管道293与排水管路26连接。
需要说明的是，当排注组件29进水时，排水压力伺服阀42处于关断状态，进水压力伺服阀43处于开启状态，常开潜水泵294打压，即可向计量管21注水。当排注组件29排水时，排水压力伺服阀42处于开启状态，进水压力伺服阀43处于关断状态。
具体地，如图1所示，在一个实施例中，水箱291内设置有常开潜水泵294，用于将水箱291内的水泵入计量管21内。
具体地，如图1所示，在一个实施例中，排气组件30包括排气管路31和第四控制阀44。
其中，排气管路31的一端与排水计量组件20连接，第四控制阀44设置在排气管路31上。
需要说明的是，排气管路31能够将计量管21内收集到的解吸气通入外部的解吸气收集装置中。
具体地，在一个实施例中，第四控制阀44采用电磁放气阀。
具体地，如图1所示，在一个实施例中，解吸气量测试装置还包括控制组件50，控制组件50与排水计量组件20和排气组件30电连接。
具体地，如图1所示，在一个实施例中，控制组件50包括电脑控制系统51和大气环境传感器52。
其中，大气环境传感器52采用一组温度和压力传感器。其与电脑控制系统51电连接，用于反馈装置外部环境的压力和温度。电脑控制系统51还与第一控制阀41、排水压力伺服阀42、进水压力伺服阀43、第四控制阀44、第一压力监测件22和第二压力监测件27电连接，能够接收第一压力监测件22和第
二压力监测件27反馈的压力信息，同时也能够控制上述控制阀动作。
本发明还提供了一种测算方法，测算方法用于测算待解吸样品100的解气量，包括以下步骤：
步骤一，将待解吸样品放入样品解吸罐内进行加热解吸；
步骤二，通过排水计量组件测量出计量管内水柱的压力值，显示出计量管内水柱的液位高度；
步骤三，根据解吸气量测算公式，计算出单周期内的解吸气量；
步骤四，根据步骤二和步骤三计算出多个连续的单周期内的解吸气量；
步骤五，将多个连续的单周期内的解吸气量累加以得到待解吸样品的解气量。
需要说明的是，假设待解吸样品100的解吸时长为T(从开始产气至产气结束的时间段)，T则包括多个连续的时间周期T1(单周期)，比如T1可设置成30秒。通过本申请的解吸气量测试装置能够测算出多个连续的单周期内的解吸气量，将多个连续的单周期内的解吸气量累加即可得到待解吸样品100的解气量。
下面结合图1详细的阐述一下本申请的一个完整的实施例：
本发明包括密封的样品解吸罐10，将现场取芯页岩样品放入样品解吸罐10内进行加热升温解吸，样品解吸罐10的上端连接一个电磁常开阀，用于控制样品解吸罐10内解吸出的气体流出与关闭，电磁常开阀后连接一个三通23，分别连接样品解吸罐10、计量管21与电磁放气阀。
玻璃管的上端连接电磁放气阀，电磁放气阀用于排放玻璃管中收集来的样品解吸罐10中的解吸气体，玻璃管底部设有水柱底部压力传感器，水柱底部压力传感器的目的在于实时测量玻璃管内水柱的压力，玻璃管的下端连接一个排水用的压力伺服阀，受气体压力传感器控制，能随着气体压力传感器处解吸气体压力大小不同程度的开启阀门大小，从而控制玻璃管内液体流出。排水用的压力伺服阀的另一端连有连通管(出水管道293)与水箱291底部相通，当样品解吸罐10内的气体进入到玻璃管内，随着气体进入，排水用的压力伺服阀打开，玻璃管内的液体通过连通管流入到水箱291之中，实现无压力排水集气。
玻璃管内的液体，不完全充满玻璃管，液位受底部设置的高精度的水柱底部压力传感器(第一压力监测件22)控制，当玻璃管内液位达到设定最大高度D时，标定此时水柱压力为Pmax，当玻璃管内液位达到设定最低高度E时，标定
水柱压力为Pmin，玻璃管内最高(D)与最低(E)液位之间的液位差标定为Hmax；且玻璃管的内径面积S为固定值，因此玻璃管内单周期能够排出的最大液体的体积量也为固定值，即Vmax＝HmaxS。
玻璃管内解吸气体达到最低液位E时，电脑控制系统51自动控制关闭电磁常开阀，打开电磁放气阀进行放气，同时控制玻璃管下端的进水用的压力伺服阀打开，通过浸没于水箱291内的常开潜水泵294将水箱291中水通过连通管泵入到玻璃管中，使玻璃管内液位恢复到最高液位值D，关闭电磁放气阀，打开常开电磁阀。
因此通过以上装置，本发明装置实现了排水集气法的气体收集，用解吸气体压力传感器与压力伺服阀联动，避免带压测量，同时无需考虑气体组成，直接通过水柱底部压力传感器读数计量解吸气体体积，数据误差小、可信度高、稳定可靠。
电磁常开阀和三通23之间设有气体压力传感器，气体压力传感器的目的在于能够测量流过气体压力传感器处的气体的压力，当压力大于0时，能随着气体压力传感器处解吸气体压力大小不同程度的开启阀门大小，消除玻璃管内因气体压力造成水柱底部压力传感器处数据的误差。因此，利用水柱底部压力传感器获取的真实水柱压力数据套入公式直接获取气体解吸量，其获得的数据更加稳定和可靠。电脑控制系统51包含大气环境传感器52与电脑控制系统51，大气环境传感器52负责收集周围环境温度与大气压力值。同时，电脑控制系统51能够集成控制电磁常开阀、电磁放气阀、水柱底部压力传感器、进排水用的压力伺服阀以及气体压力传感器，收集实时数据。因此，实现了本发明装置所需要的自动化控制。
在本申请附图中未显示出的替代实施例中，每一个玻璃管都配备一个单独的电磁常开阀、电磁放气阀、水柱底部压力传感器、排水、进水用于压力伺服阀以及气体压力传感器，形成一套单独的计量单元，单独一个待解吸样品100。水箱291通过连通管以及常开潜水泵294可以实现与多个计量单元进行连通，此结构的设计能够实现同时对多个待解吸样品100进行分析，能够高效、便捷地完成高密度、快节奏的取芯评价工作。
下面将具体说明利用现场解吸量测量装置的现场解吸量测量方法，包括以下步骤：
步骤A：仪器初始化，电脑自动控制进水压力伺服阀的开启，使玻璃管内水位标定到最高液位高度D值，关闭电磁放气阀，电脑控制系统记录大气环境传感器处温度与压力；
步骤B：将页岩样品置于密封的样品解吸罐中，加热后解吸出的气体通过电磁常开阀、三通进入到玻璃管内；
步骤C：位于电磁常开阀与三通之间的气体压力传感器，实时采集解吸气体压力，当玻璃管内实时压力P气大于0时，电脑自动控制打开玻璃管下端排水用的压力伺服阀，通过排水用的压力伺服阀不同程度的开启控制玻璃管内的液体进入连接管后排入水箱之中，使气体压力传感器处保持无压状态，此时，水柱底部压力传感器实时采集水柱压力大小P水；
步骤D：当玻璃管中的液位下降到达到预设最低液位高度E时，P水＝Pmin，此时，电脑自动控制关闭电磁常开阀，打开电磁放气阀进行放气，同时控制玻璃管下端的进水用的压力伺服阀打开，通过常开潜水泵将水箱内的液体泵入到玻璃管中；
步骤E：当玻璃管内液位恢复到设定液位最大值D，气体压力传感器处压力值为0时，恢复初始状态，关闭电磁放气阀，打开电磁常开阀，开启下一次解吸循环；
步骤F：根据水柱底部压力传感器实时所测压力计算解吸气量。
下面将详细解释说明如何在步骤F中的计算解吸气量。
根据步骤A与C的数据，标定玻璃管放气时的放出的固定体积Vmax的值，Vmax＝HmaxS(公式1)
其中，Hmax为标定玻璃管最大液位差Hmax，S为玻璃管内横截面的面积；
假设任意两个时刻T1和T2，水柱压力读数分别为P1和P2，两次测量间隔内玻璃管排出气体n个单周期，则两次计量间隔内解吸气量(一个单周期的解吸气量)为：
V＝(P1-Pmin+Pmax-P2)S/ρg+nVmax；
V＝(P1-Pmin+Pmax-P2)S/ρg+nVmax；
其中，Pmax、Pmin分别为玻璃计量管液面预设最大(D)、最低高度(E)时压力传感器处压力值，S为玻璃计量管内横截面的面积ρ为玻璃计量管液体密度，g为重力加速度值。可进一步根据不同时间记录的温度和大气压，将解吸气量转化为标准状态下的解吸气量。
在本发明的描述中，需要理解的是，术语“上”、“下”、“底”、“顶”、“前”、“后”、“内”、“外”、“左”、“右”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
虽然在本文中参照了特定的实施方式来描述本发明，但是应该理解的是，这些实施例仅仅是本发明的原理和应用的示例。因此应该理解的是，可以对示例性的实施例进行许多修改，并且可以设计出其他的布置，只要不偏离所附权利要求所限定的本发明的精神和范围。应该理解的是，可以通过不同于原始权利要求所描述的方式来结合不同的从属权利要求和本文中所述的特征。还可以理解的是，结合单独实施例所描述的特征可以使用在其他所述实施例中。
Claims (13)
- 一种解吸气量测试装置，其特征在于，包括：样品解吸罐，用于放置待解吸样品并为待解吸样品提供解吸的环境；排水计量组件，包括能够显示液位高度值的计量管，所述计量管接收所述样品解吸罐解吸出的气体，并且，所述计量管分别连接排出水或注入水的排注组件、监测所述计量管内的液体压力的第一压力监测件，以及监测所述计量管内的气体压力的第二压力监测件；排气组件，与所述排水计量组件连通，用于排放所述排水计量组件内的解吸气；以及控制系统，控制解吸的气体进入所述计量管，控制所述排注组件排出水或注入水，以及控制所述排气组件排出解吸气；其中，当解吸气体进入所述计量管时，控制系统控制所述排注组件排出水的速度，使所述第二压力监测件的保持无压状态；当所述第一压力监测件的压力达到设定的最小值时，所述控制系统暂停解吸气体进入计量管，控制所述排气组件排气并控制所述排注组件向所述计量管内注入水，直到所述第一压力监测件的压力达到设定的最大值。
- 根据权利要求1所述的解吸气量测试装置，其特征在于，所述样品解吸罐内设置有弹性套筒，所述弹性套筒连接加泄压机构，所述加泄压机构通过所述弹性套筒向所述样品解吸罐内的待解吸样品加压或泄压；所述样品解吸罐的上部设置有加紧所述待解吸样品的压紧机构。
- 根据权利要求2所述的解吸气量测试装置，其特征在于，所述样品解吸罐的内壁上设置有上固定圈和下固定圈，所述弹性套筒包括竖直设置的第一胶套，所述第一胶套的上端设置有上边沿，下端设置有下边沿；所述上边沿密封连接在所述上固定圈上，所述下边沿密封连接在所述下固定圈上，所述样品解吸罐的内壁与所述弹性套筒的外壁之间形成环形空间，所述加泄压机构向所述环形空间内加压或泄压。
- 根据权利要求3所述的解吸气量测试装置，其特征在于，所述样品解吸罐的顶部设置有上盖，所述加紧机构包括设置在所述上盖上的第二胶筒，所述第 二胶筒与所述上盖之间设置有弹性件，所述弹性件通过弹性使所述第二胶筒压紧所述待解吸样品。
- 根据权利要求1至4中任一项所述的解吸气量测试装置，其特征在于，多个所述计量管并联设置在箱体内，每个所述计量管分别连接一个样品解吸罐；所述箱体内的上部和下部分设置有连接所述计量管的密封接头，所述箱体上部的密封接头上设置有压紧弹簧，通过所述压紧弹簧拆卸所述计量管。
- 根据权利要求5所述的解吸气量测试装置，其特征在于，所述计量管包括若干不同型号的计量管，不同型号的计量管的两端的接头相同，中部带有刻度的主体的直径不同；在实验时，根据实验精度要求更换不同型号的计量管。
- 根据权利要求1至6中任一项所述的解吸气量测试装置，其特征在于，所述计量管设置有进出气口和进出水口，所述样品解吸罐通过第一管路连接所述进出气口，所述排注组件连接所述进出水口；所述排气组件通过第二管线连接所述进出气口。
- 根据权利要求7所述的解吸气量测试装置，其特征在于，所述进出水口包括进水口和出水口，所述排注组件包括水箱，所述水箱通过进水管线连接所述进水口，并且通过出水管线连接所述出水口；其中，所述进水管线上设置有进水压力伺服阀，所述排水管线上设置有排水压力伺服阀。
- 根据权利要求8或9所述的解吸气量测试装置，其特征在于，所述计量管的进出气口连接有三通，所述三通还分别连接第一管路和第二管路；所述第二压力监测件设置在所述第一管路上，并且所述第一管路上设置有进气阀；所述第二管路上设置有排气阀。
- 一种测算待解吸样品的解吸气量的方法，其特征在于，所述测算方法使用根据权利要求1至9中任一项所述的解吸气量测试装置，包括以下步骤：步骤一，将所述待解吸样品放入样品解吸罐内进行加热解吸；步骤二，将解吸的气体输送到计量管内，通过排注组件排出水并保持第二监测件始终处于无压状态；当第一压力监测件监测到所述计量管内的液体压力到达最小值时，排出计量管内的气体并通过排注组件注入水到初始状态，从而完成一次循环周期；步骤三，计算单次循环周期的解吸量；步骤四，选取开始时间和结束时间时计量管内的液面值以及循环周期次数计算开始时间到结束时间的总解吸量。
- 根据权利要求10所述的方法，其特征在于，单次循环的解吸量通过下式计算：
Vmax＝HmaxS其中，Hmax为计量管最大液位差，S为计量管内横截面的面积； - 根据权利要求11所述的方法，其特征在于，所述计量管预设的最大压力值为Pmax，最小压力值为Pmin；当第一压力监测件监测的水柱压力P到达Pmin时控制系统关闭解吸气进入计量管，打开排气组件并控制排注组件向计量管内注入水；当第一压力监测件监测的水柱压力P到到达Pmax时，关闭排气组件，打开解吸气进入计量管并控制排注组件从计量管内排出水。
- 根据权利要求12所述的测算方法，其特征在于，任意两个时刻T1和T2，水柱压力读数分别为P1和P2，两次测量间隔内计量管排出气体n次，则两次计量间隔内解吸气量为：
V＝(P1-Pmin+Pmax-P2)S/ρg+nVmax其中，S为计量管内横截面的面积，ρ为计量管液体密度，g为重力加速度值。可进一步根据不同时间记录的温度和大气压，将解吸气量转化为标准状态下的解吸气量。
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