CN106644820B - Shale gas desorption capability tester under slickwater effect - Google Patents
Shale gas desorption capability tester under slickwater effect Download PDFInfo
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Abstract
The invention relates to a shale gas desorption capability test structure under the action of indoor slickwater in petroleum industry, in particular to a shale gas desorption capability tester under the action of slickwater, wherein: the constant temperature measuring system is arranged in the constant temperature box, and the constant temperature box is controlled to run by a control cabinet with a PLC control sheet; the pipeline between the gas pressurizing storage system and the constant temperature measurement system is connected with a volume metering system and a vacuumizing system through two bypass connecting pipes, the volume metering system and the vacuumizing system are respectively positioned at the front ends of the two bypass connecting pipes, and the tail ends of the two bypass connecting pipes are positioned at the air outlet end of the gas pressurizing storage system; and the air outlet end of the constant temperature measurement system is communicated with the blow-down pipe. The invention has the advantages due to the structure that: the experimental result can be obtained only by simple calculation, the experimental precision is improved, and the experimental period is shortened.
Description
Technical Field
The invention relates to a shale gas desorption capability test structure under the action of indoor slick water in the petroleum industry, in particular to a shale gas desorption capability tester under the action of slick water, which obtains an experimental result through simple calculation, improves experimental precision and shortens an experimental period.
Background
The slick water is fracturing fluid composed of clear water and various additives (the additives are resistance reducing agent, synergistic agent, anti-swelling agent, antifoaming agent and the like); wherein water comprises 99% of the total volume and the additive components directly determine the properties of the fracturing fluid.
The slickwater fracturing fluid is the most applied fracturing fluid technology in the development operation of the shale gas in the United states at present, so that the fracturing cost is reduced by 65% in large hydraulic fracturing, and the final recovery ratio of the shale gas is improved by 20%. The slick water fracturing is mainly suitable for strata with small water sensitivity, natural fractures of reservoirs are developed and brittleness is high. Compared with the conventional gel fracturing, the gel fracturing has low friction resistance, can be pumped in a large amount under high discharge capacity, forms a deeper and more complex fracture network, obtains a larger volume of a modified reservoir, and has better fracturing effect; the residue is less, and the damage to the reservoir is small; the flow back is easy, the recovery is easy, and the environmental pollution is small; the cost is low.
However, there are also some disadvantages to be solved, such as: poor sand carrying capacity due to lower viscosity; the width of the seam net formed during fracturing is narrower; the required pumping discharge is high; low efficiency, large dosage, etc. In practical application, the formulation of the slickwater fracturing fluid should be determined according to the reservoir characteristics and experiments of the fracturing construction. When selecting the fracturing fluid additives, factors such as pump speed and pressure, clay content, generation potential of siliceous and organic debris, microorganism activity, flowback of the fracturing fluid and the like are considered.
The technical problems of the experimental test equipment in the prior art are as follows: the test period is long, required experimental data are obtained by complex calculation through the special law of Boyle-Ma Lve, the error is large, and the accuracy of the obtained experimental data is low.
Disclosure of Invention
The invention aims to provide a shale gas desorption capacity tester under the action of slickwater, which can obtain an experimental result through simple calculation, improve experimental precision and shorten experimental period.
The technical scheme adopted for achieving the purpose is that the shale gas desorption capability tester under the action of slickwater comprises the following components: the constant temperature measuring system is arranged in the constant temperature box, and the constant temperature box is controlled to run by a control cabinet with a PLC control sheet;
the pipeline between the gas pressurizing storage system and the constant temperature measurement system is connected with a volume metering system and a vacuumizing system through two bypass connecting pipes, the volume metering system and the vacuumizing system are respectively positioned at the front ends of the two bypass connecting pipes, and the tail ends of the two bypass connecting pipes are positioned at the air outlet end of the gas pressurizing storage system;
the air outlet end of the constant temperature measurement system is communicated with the blow-down pipe;
the air supply system further comprises at least one air supply line, the air supply line further comprises an air bottle and a one-way valve which are sequentially connected in series on the air supply line, and the air outlet end of the air supply line is communicated with the air inlet end of the air pressurizing storage system; the gas pressurizing storage system further comprises a gas pressurizing pump and at least one gas pressurizing line, and the gas pressurizing line further comprises a buffer tank, a pressure regulating valve and a one-way valve which are sequentially connected in series on the gas pressurizing line; the air inlet end of the air pressurizing pipeline is communicated with the air pressurizing pump, and the air outlet end of the air pressurizing pipeline is communicated with the air inlet end of the constant temperature measuring system and the tail ends of the two bypass connecting pipes; the air inlet end of the air booster pump is communicated with the air outlet end of the air source supply pipeline;
the constant temperature measuring system further comprises at least one constant temperature measuring line, and the constant temperature measuring line further comprises a first pressure sensor, a first control valve, a second pressure sensor and a second control valve which are sequentially arranged on the constant temperature measuring line; a first bypass pipe is arranged on the constant temperature measuring pipe between the first pressure sensor and the first control valve, a third control valve and a reference chamber are arranged on the first bypass pipe, and a first temperature sensor which is fixed on the outer wall of the reference chamber and used for detecting the temperature of the cavity in the reference chamber is arranged on the first bypass pipe; a second bypass pipe is arranged on the constant-temperature measuring pipeline between the second pressure sensor and the second control valve, a fourth control valve, a rock chamber and a fifth control valve are sequentially arranged on the second bypass pipe, a second temperature sensor for detecting the temperature of the inner cavity of the rock core is fixed on the outer wall of the rock chamber, and the fifth control valve is communicated with the output end of a slickwater injection pipeline of the slickwater injection system;
the volume metering system comprises a brine container, a buret with scales and a fifth manual valve, wherein the brine container is sequentially connected with a first bypass connecting pipe in series, and the brine container is positioned at the forefront end of the first bypass connecting pipe;
the vacuum pumping system comprises a vacuum pump and a fourth manual valve which are sequentially connected in series on a second bypass connecting pipe in the two bypass connecting pipes, and the vacuum pump is positioned at the forefront end of the second bypass connecting pipe;
the system for injecting the slickwater comprises a slickwater injection pipeline, an intermediate container and an injection pump are arranged on the slickwater injection pipeline, the output end of the injection pump is connected with a piston in the inner cavity of the intermediate container;
the system comprises a gas source supply system, a gas booster pump, a pressure regulating valve, a check valve, a constant temperature measurement system, a first pressure sensor, a first control valve, a second pressure sensor, a second control valve, a third control valve, a first temperature sensor, a fourth control valve, a fifth control valve and a second temperature sensor, wherein the gas booster pump, the pressure regulating valve and the check valve are arranged in the gas booster storage system;
the control cabinet with the PLC control sheet is provided with a display and an input operation panel.
To achieve the best overall effect, further: the air source supply system comprises three air source supply lines, the air pressurization storage system comprises three air pressurization lines, and the constant temperature measurement system comprises four constant temperature measurement lines;
the air outlet ends of the three air source supply lines are communicated with the air inlet end of the air booster pump of the air booster storage system through a first four-way valve;
the air inlet ends of the three gas pressure increasing lines are communicated with the air outlet ends of the gas booster pump through a second four-way valve, and the air outlet ends of the three gas pressure increasing lines are communicated with the air inlet ends of the constant temperature measuring system and the tail ends of the two bypass connecting pipes through six-way valves;
the air inlet ends of the four constant temperature measuring lines are communicated with the six-way valve through the first five-way valve, and the fifth control valve on the four constant temperature measuring lines is communicated with the output end of the slickwater injection pipeline of the slickwater injection system through the second five-way valve.
The invention has the advantages due to the structure that: the experimental result can be obtained only by simple calculation, the experimental precision is improved, and the experimental period is shortened.
Drawings
The invention may be further illustrated by means of non-limiting examples given in the accompanying drawings.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a control block diagram of the electromagnetic valve according to the present invention.
Fig. 3 is a block diagram of a valve employing a hydraulic or pneumatic valve in accordance with the present invention.
Fig. 4 is a schematic structural view of a core chamber according to the present invention.
FIG. 5 is a schematic view of the graduated burette of the present invention.
In the figure: A. an air source supply system; B. a gas pressurized storage system; C. a constant temperature measurement system; D. a volume metering system;
E. a vacuum pumping system; F. a slick water injection system; 1. blow-down pipe; 2. a gas booster pump; 3. a brine container; 4. a burette having a scale; 5. a vacuum pump; 6. an intermediate container; 7. an injection pump; 8. a control cabinet with a PLC control sheet; 9. a display; 10. an input operation panel; 11. a vacuum container; 1201. the method comprises the steps of carrying out a first treatment on the surface of the 13. A gas cylinder I; 14. a gas cylinder II; 15. a gas cylinder III; 16. a one-way valve I; 17. a one-way valve II; 18. a one-way valve III; 19. a manual valve I; 20. a manual valve II; 21. a manual valve III; 22. a manual valve IV; 23. a manual valve V; 24. a buffer tank I; 25. a pressure regulating valve I; 26. a one-way valve V; 27. a buffer tank II; 28. a pressure regulating valve II; 29. a one-way valve VI; 30. buffer tank III; 31. a pressure regulating valve III; 32. a one-way valve VII; 33. a pressure sensor I; 34. a control valve I; 35. a pressure sensor II; 36. a control valve II; 37. a control valve III; 38. a reference chamber I; 39. a temperature sensor I; 40. a control valve IV; 41. a rock ventricle I; 42. a temperature sensor II; 43. a control valve V; 44. a pressure sensor III; 45. a control valve VI; 46. a pressure sensor IV; 47. a control valve VII; 48. a control valve VIII; 49. a reference chamber II; 50. a temperature sensor III; 51. a control valve IX; 52. a rock ventricle II; 53. a temperature sensor IV; 54. a control valve X; 55. a pressure sensor V; 56. a control valve XI; 57. a pressure sensor VI; 58. a control valve XII; 59. a control valve XIII; 60. a reference chamber III; 61. a temperature sensor V; 62. a control valve XIV; 63. a rock ventricle III; 64. a temperature sensor VI; 65. a control valve XV; 66. a pressure sensor VII; 67. a control valve XVI; 68. a pressure sensor VIII; 69. a control valve XVII; 70. a control valve XVIII; 71. a reference chamber IV; 72. a temperature sensor VII; 73. a control valve XIX; 74. a rock ventricle IV; 75. a temperature sensor VIII; 76. a control valve XX; 77. a four-way valve I; 78. a four-way valve II; 79. a six-way valve; 80. a five-way valve I; 81. five-way valve II.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
referring to fig. 1 to 5, the shale gas desorption capability tester under the action of slickwater in the drawings is characterized in that: the constant temperature measuring system comprises an air source supply system A, an air pressurizing storage system B and a constant temperature measuring system C which are sequentially connected in series on a pipeline, wherein the constant temperature measuring system C is positioned in a constant temperature box, and the constant temperature box is controlled to operate by a control cabinet 8 with a PLC control sheet;
the pipeline between the gas pressurizing storage system B and the constant temperature measurement system C is connected with a volume metering system D and a vacuumizing system E through two bypass connecting pipes, the volume metering system D and the vacuumizing system E are respectively positioned at the front ends of the two bypass connecting pipes, and the tail ends of the two bypass connecting pipes are positioned at the air outlet end of the gas pressurizing storage system B;
the air outlet end of the constant temperature measurement system C is communicated with the blow-down pipe 1;
the air supply system A further comprises at least one air supply line, and the air supply line further comprises an air bottle and a one-way valve which are sequentially connected in series on the air supply line, wherein the air outlet end of the air supply line is communicated with the air inlet end of the air pressurizing storage system B;
the gas pressurizing storage system B further comprises a gas pressurizing pump 2 and at least one gas pressurizing line, and the gas pressurizing line further comprises a buffer tank, a pressure regulating valve and a one-way valve which are sequentially connected in series on the gas pressurizing line; the air inlet end of the air pressurizing pipeline is communicated with the air pressurizing pump 2, and the air outlet end of the air pressurizing pipeline is communicated with the air inlet end of the constant temperature measuring system C and the tail ends of the two bypass connecting pipes; the air inlet end of the gas booster pump 2 is communicated with the air outlet end of the air source supply pipeline;
the constant temperature measuring system C further comprises at least one constant temperature measuring line, and the constant temperature measuring line further comprises a first pressure sensor, a first control valve, a second pressure sensor and a second control valve which are sequentially arranged on the constant temperature measuring line; a first bypass pipe is arranged on the constant temperature measuring pipe between the first pressure sensor and the first control valve, a third control valve and a reference chamber are arranged on the first bypass pipe, and a first temperature sensor which is fixed on the outer wall of the reference chamber and used for detecting the temperature of the cavity in the reference chamber is arranged on the first bypass pipe; a second bypass pipe is arranged on the constant-temperature measuring pipeline between the second pressure sensor and the second control valve, a fourth control valve, a rock chamber and a fifth control valve are sequentially arranged on the second bypass pipe, a second temperature sensor for detecting the temperature of the inner cavity of the rock core is fixed on the outer wall of the rock chamber, and the fifth control valve is communicated with the output end of the slickwater injection pipeline of the slickwater injection system F;
the volume metering system D comprises a brine container 3, a buret 4 with scales and a fifth manual valve which are sequentially connected in series on a first bypass connecting pipe of the two bypass connecting pipes, wherein the brine container 3 is positioned at the forefront end of the first bypass connecting pipe;
the vacuumizing system E comprises a vacuum pump 5 and a fourth manual valve which are sequentially connected in series on a second bypass connecting pipe in the two bypass connecting pipes, and the vacuum pump 5 is positioned at the forefront end of the second bypass connecting pipe;
the slick water injection system F further comprises a slick water injection pipeline, an intermediate container 6 and an injection pump 7 are arranged on the slick water injection pipeline, and the output end of the injection pump 7 is connected with a piston in the inner cavity of the intermediate container 6;
the system comprises a check valve in an air source supply system A, a gas booster pump 2, a pressure regulating valve and a check valve in a gas booster storage system B, wherein a first pressure sensor, a first control valve, a second pressure sensor, a second control valve, a third control valve, a first temperature sensor, a fourth control valve, a fifth control valve and a second temperature sensor in a constant temperature measurement system C, a vacuum pump 5 in a vacuumizing system E and an injection pump 7 in a slickwater injection system F are controlled to run by a control cabinet 8 with a PLC control sheet;
the control cabinet 8 with the PLC control sheet is provided with a display 9 and an input operation panel 10.
In order to achieve the best overall effect, in the above embodiment, it is preferable that: the air source supply system A is provided with three air source supply lines, the air pressurization storage system B is provided with three air pressurization lines, and the constant temperature measurement system C is provided with four constant temperature measurement lines;
the air outlet ends of the three air source supply lines are communicated with the air inlet end of the air booster pump 2 of the air booster storage system B through a first four-way valve;
the air inlet ends of the three gas pressure increasing lines are communicated with the air outlet end of the gas booster pump 2 through a second four-way valve, and the air outlet ends of the three gas pressure increasing lines are communicated with the air inlet end of the constant temperature measuring system C and the tail ends of the two bypass connecting pipes through six-way valves;
the air inlet ends of the four constant temperature measuring lines are communicated with the six-way valve through the first five-way valve, and the fifth control valve on the four constant temperature measuring lines is communicated with the output end of the slickwater injection pipeline of the slickwater injection system F through the second five-way valve.
In order to achieve the best overall effect, in the above embodiment, it is preferable that: and a manual valve is arranged on an air supply pipeline between the air bottle of the air supply system A and the one-way valve.
In order to further shorten the experimental time, in the above embodiment, it is preferable that: the core chamber of the constant temperature measurement system C further comprises a tank 1201, a cover 1203 for closing the inner cavity of the tank 1201, and a core cup 1204 fixed at the bottom of the inner cavity of the tank 1201, wherein the outer diameter of the core cup 1204 is matched with the inner diameter of the inner cavity of the tank 1201, the top port of the core cup 1204 is lower than the top port of the tank 1201, an inflatable cavity 1205 is formed between the top port of the core cup 1204 and the top port of the tank 1201, and the inner cavity of the core cup 1204 is a shale powder filling cavity 1206; the second temperature sensor is in communication with the plenum 1205 or shale powder fill cavity 1206;
the outlet of the second bypass pipe passing through the cover 1203 is located in the aeration chamber 1205, and the outlet end of the slickwater injection line of the slickwater injection system F passing through the bottom plate of the tank 1201 and the bottom plate of the core cup 1204 in sequence is located in the shale powder filling chamber 1206.
To ensure that the slick water is balanced, in the above embodiment, it is preferable that: the slickwater injection pipeline of the slickwater injection system F is provided with liquid outlet holes 1207 uniformly distributed on a pipe section positioned in the shale powder filling cavity 1206.
To protect the safety of the vacuum pump 5, the backflow liquid is preferably prevented from flowing back into the vacuum pump 5 in the above embodiment: a vacuum container 11 is arranged on a second bypass connecting pipe between the vacuum pump 5 of the vacuumizing system E and the fourth manual valve.
To further enable automation, in the above embodiment, it is preferable that: the check valve in the air source supply system A, the pressure regulating valve and the check valve in the air pressurization storage system B, and the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve in the constant temperature measurement system C are all battery valves and are controlled to be opened and closed by a control cabinet 8 with a PLC control sheet. The check valve in the air source supply system A, the pressure regulating valve and the check valve in the air pressurization storage system B, the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve in the constant temperature measurement system C all adopt hydraulic valves or pneumatic valves, the hydraulic valves or the pneumatic valves are controlled to be opened and closed by corresponding hydraulic pumps or pneumatic pumps, the hydraulic pumps or the pneumatic pumps are controlled to operate by a control cabinet 8 with a PLC control sheet, and the hydraulic pumps or the pneumatic pumps are communicated with a high-pressure hydraulic source or a high-pressure pneumatic source.
The components involved in all of the embodiments described above are commercially available, and the slickwater injection system F is a commercially available automatic injection structure.
The experimental process is described below by using three air supply lines of the air supply system A, three air pressure increasing lines of the air pressure increasing storage system B, and four constant temperature measuring lines of the constant temperature measuring system C.
1. Volume calibration of constant temperature measurement system C
1.1 System volume calibration
【1】 The system volume V1 of the first thermostatically measured line is calibrated [ the arrangement of the first thermostatically measured line to the fourth thermostatically measured line is from top to bottom as seen in fig. 1 ]
The system volume V1 of the first constant temperature measurement line is the sum of all the closed space volumes between the six-way valve 79 and the reference chamber i 38, the control valve ii and the control valve V;
the testing steps are as follows: opening a pressure sensor I33, a control valve III 37, a control valve IV 40, a five-way valve I80, a six-way valve 79, a manual valve V IV 22 and a manual valve V23, and closing a control valve V43 and a control valve II 36 to enable a first constant temperature measuring line of the constant temperature measuring system C, the volume measuring system D and the vacuumizing system E to form a control channel; starting a vacuum pump 5, vacuumizing to 10Pa, and enabling the solution in the saline container 3 to enter a graduated buret 4 due to negative pressure [ the initial height of the solution in the graduated buret 4 is 0 scale mark ] and enabling the reading after the liquid level of the graduated buret 4 is stabilized at one height to be the system volume V1;
the test procedure above gave:
the system volume V2 of the second thermostatic measuring line of the thermostatic measuring system C;
the system volume V3 of the third thermostatic measurement line of the thermostatic measurement system C;
system volume V4 of the fourth thermostatically measuring line of thermostatically measuring system C.
1.2 reference Chamber volume calibration
System volume V5 calibration of reference chamber I38
The volume of reference chamber I refers to the sum of all the volumes of the enclosed spaces between six-way valve 79 and reference chamber I38.
The testing steps are as follows: opening a control valve III 37, a five-way valve I80, a six-way valve 79, a manual valve V IV 22 and a manual valve V23, and closing a pressure sensor I33, so that a pipeline of a reference chamber I38 of a first constant temperature measuring line of the constant temperature measuring system C forms a communicated control channel with the volume measuring system D and the vacuumizing system E; starting a vacuum pump 5, vacuumizing to 10Pa, and enabling the solution in the brine container 3 to enter a graduated buret 4 due to negative pressure [ the initial height of the solution in the graduated buret 4 is 0 scale mark ] and enabling a reading after the liquid level of the graduated buret 4 is stabilized at one height to be a reference chamber I system volume V5;
the test procedure above gave:
a reference chamber II system volume V6 of the constant temperature measurement system C;
a reference chamber III system volume V6 of the constant temperature measurement system C;
reference room iv system volume V6 of constant temperature measurement system C.
1.3 core Chamber volume calibration
System volume V9 calibration of core chamber I41
The system volume V9 of the core chamber i 41 refers to the sum of all the closed space volumes between the six-way valve 79 and the control valve iii 37, the control valve ii and the control valve V. Is the difference between the system volume V1 and the reference chamber i system volume V5.
I.e. the system volume V9 of the rock chamber i is equal to the system volume V1 minus the reference chamber i system volume V5;
the same method comprises the following steps:
the system volume V10 of the rock chamber ii is equal to the system volume V2 minus the system volume V6 of the reference chamber i;
the system volume V11 of the rock chamber iii is equal to the system volume V3 minus the system volume V7 of the reference chamber i;
the ventricular IV system volume V12 is equal to the system volume V4 minus the reference chamber I system volume V8.
2. Sample can
Shale samples pretreated to reach equilibrium moisture are accurately weighed and rapidly loaded into a rock ventricle [ namely a rock ventricle I41, a rock ventricle II 52, a rock ventricle III 63 and a rock ventricle IV 74 ].
3. Air tightness inspection
3.1 aeration
Helium is filled into the first constant temperature measuring line, the second constant temperature measuring line, the third constant temperature measuring line and the fourth constant temperature measuring line respectively from the gas cylinder I13 [ helium filled into the gas cylinder I13 ], and the pressure is higher than the experimental design pressure by 2MPa.
3.2 temperature adjustment
The temperature of the system is set and regulated [ the heating system in the incubator is regulated by a control cabinet 8 with a PLC control sheet ], and the temperature data of the reference chamber and the rock chamber are collected by a temperature sensor, so that the temperature of the rock chamber is stabilized at the experimental required temperature.
3.3 data acquisition
The display 9 on the control cabinet 8 with the PLC control chip displays the pressure data of the reference chamber and the rock chamber, and the pressure is kept to be changed within 1 hour and not more than 1% of the total pressure, so that the air tightness of the system is considered to be good.
4. Rock ventricular residual volume determination
4.1 determination of the residual volume V13 of the rock ventricle I
The residual volume V13 of the rock chamber I refers to the sum of the volumes of the pure shale in the rock chamber, wherein the pure shale comprises intra-particle pores, inter-particle pores, residual space of an adsorption tank, and connecting pipelines, valves and pressure gauges.
The testing steps are as follows: and opening a control valve III 37, a control valve I34, a control valve IV 40, a six-way valve 79, a five-way valve I80 and a manual valve IV 22, and vacuumizing to 4Pa by using the vacuum pump 5. Closing the six-way valve 79, the manual valve IV 22 and the vacuum pump, wherein the manual valve V23 and the graduated buret 4 read the system volume V1', V1' and the reference chamber I volume V5 after the rock core is filled, and the residual volume V13 of the rock core chamber I41 is obtained;
i.e. the residual volume v13=v1' — V5 of the rock ventricle i.
The same method is as follows:
the remaining volume v14=v2' -V6 of the rock ventricle ii;
the residual volume v15=v3' — V7 of the core chamber iii;
the residual volume v16=v4' — V8 of the core chamber iv.
5. Isothermal adsorption test
5.1 filling the reference Chamber with methane
Opening a gas cylinder II 14 (methane is in the gas cylinder II 14), opening a pressure regulating valve, a control valve III 37, a control valve VIII 48, a control valve XIII59 and a control valve XVIII 70, filling methane gas into a reference chamber I38, a reference chamber II 49, a reference chamber III 60 and a reference chamber IV 71, regulating the pressure in each reference chamber to a set pressure, and recording the pressure in each reference chamber as an initial pressure after 10 minutes.
5.2 filling the sample Chamber with methane
After the pressure in each reference chamber is stable, a control valve IV 40, a control valve IX 51, a control valve XIV62 and a control valve XIX73 are opened, methane is filled into the rock chamber, 8-10 pressure interval data points are set and measured in the experimental pressure range, each point is about 1/n of the highest pressure, and time, pressure and temperature data in each reference chamber and each sample chamber are collected.
6. Testing of influence of slickwater on shale desorption capacity
6.1, slowly opening the control valve II 36, the control valve VII 47, the control valve XVI 58 and the control valve XX 69 corresponding to each rock chamber, respectively discharging certain gas, and closing the control valve II 36, the control valve VII 47, the control valve XVI 58 and the control valve XX 69 corresponding to each rock chamber when the pressure of each rock chamber reaches the set pressure. At the same time, attention was paid to observing whether slick water was discharged, and the corresponding volume and time were measured.
And 6.2, after the balance condition is reached, acquiring relevant data such as time, pressure, temperature and the like of each rock ventricle.
6.3, testing is carried out from high to low by pressure points, and the steps 6.1 and 6.2 are repeated until the last pressure point is tested.
7. Data processing
7.1 rock sample volume
(1) Rock sample volume V17 in the core chamber i 41
The core chamber i 1 should have a sample volume V17 that is the difference between the system volume V5 of the reference chamber i 38 and the remaining volume V13 of the core chamber i 41. The formula is as follows:
rock sample volume v17=v5-V13 in the core chamber i
And the same is done;
rock sample volume v18=v6-V14 in the core chamber ii
Rock sample volume v19=v7-V15 in the core chamber ii
Rock sample volume v20=v8-v16 in the core chamber ii
All the volume units are ml;
7.2 adsorption amount at each pressure point
And calculating the adsorption quantity of different balance pressure points according to the balance pressure and the temperature of each rock chamber and each reference chamber. The following formula is used:
PV＝nZRT
wherein: p-gas pressure, MPa;
v-gas volume, ml;
n-the number of moles of gas, mol;
z is the compression factor of the gas, dimensionless;
r-molar gas constant, J. Mol-1. K-1;
t-thermodynamic temperature, K.
The number of moles (n 1) of the gas in the core chamber before the balance of each pressure point and the number of moles (n 2) of the gas in the core chamber after the balance are respectively calculated, and then the number of moles (ni) of the gas adsorbed by the core is as follows:
ni＝n1-n2
wherein: ni—moles of gas, moles;
n1, the mole number and the mole of gas in the core chamber before balancing;
n 2-mole number of gas in the core chamber after equilibration, mole.
Adsorbed gas volume Vi for each pressure point:
Vi＝ni×22.4×1000
adsorption amount V of each pressure point adsorbs:
v adsorption = Vi/Gc
Wherein: v adsorption-adsorption amount, ml/g;
vi-total volume of adsorbed gas, ml;
gc-weight of rock sample, g.
7.3 adsorption amount at pressure point after desorption
And calculating the adsorption quantity of different pressure points after desorption according to the balance pressure and the temperature of the reference chamber and the rock chamber. The following formula is used:
PV＝nZRT
wherein: p-gas pressure, MPa;
v-gas volume, ml;
n-the number of moles of gas, mol;
z is the compression factor of the gas, dimensionless;
r-molar gas constant, J. Mol-1. K-1;
t-thermodynamic temperature, K.
The number of moles (n 1 ') of the gas in the core chamber before the balance and the number of moles (n 2 ') of the gas in the core chamber after the balance of each pressure point are respectively calculated, and the number of moles (ni ') of the gas adsorbed by the core is:
ni’＝n1’-n2’
wherein: ni' —moles of gas, moles;
n1' — the number of moles and moles of gas in the core chamber before balancing;
n2' — the number of moles of gas in the core chamber after equilibration, mol.
Adsorbed gas volume Vi' for each pressure point:
Vi’＝ni’×22.4×1000
adsorption amount V of each pressure point adsorption':
v adsorption ' =vi '/Gc '
Wherein: v adsorption' -adsorption amount, ml/g;
vi' —total volume of adsorbed gas, ml;
gc' —weight of rock sample, g.
Other gases were filled into cylinder III 15, and a multiplex experiment was performed. The structure can obtain experimental results only through simple calculation, improves experimental precision and shortens experimental period.
It should be apparent that all of the embodiments described above are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without any inventive effort, based on the embodiments described herein fall within the scope of the protection of the present invention.
In summary, due to the above structure, the experimental result can be obtained only by simple calculation, the experimental precision is improved, and the experimental period is shortened.
Claims (6)
1. The utility model provides a shale gas desorption ability tester under slick water effect which characterized in that: the constant temperature measuring system comprises an air source supply system (A), an air pressurizing storage system (B) and a constant temperature measuring system (C) which are sequentially connected in series on a pipeline, wherein the constant temperature box is controlled to run by a control cabinet (8) with a PLC control sheet;
the pipeline between the gas supercharging storage system (B) and the constant temperature measurement system (C) is connected with a volume metering system (D) and a vacuumizing system (E) through two bypass connecting pipes, the volume metering system (D) and the vacuumizing system (E) are respectively positioned at the front ends of the two bypass connecting pipes, and the tail ends of the two bypass connecting pipes are positioned at the air outlet end of the gas supercharging storage system (B);
the air outlet end of the constant temperature measurement system (C) is communicated with the blow-down pipe (1);
the air supply system (A) further comprises at least one air supply line, the air supply line further comprises an air bottle and a one-way valve which are sequentially connected in series on the air supply line, and the air outlet end of the air supply line is communicated with the air inlet end of the air pressurizing storage system (B);
the gas pressurizing storage system (B) further comprises a gas pressurizing pump (2) and at least one gas pressurizing line, and the gas pressurizing line further comprises a buffer tank, a pressure regulating valve and a one-way valve which are sequentially connected in series on the gas pressurizing line; the air inlet end of the air pressurizing pipeline is communicated with the air pressurizing pump (2), and the air outlet end of the air pressurizing pipeline is communicated with the air inlet end of the constant temperature measuring system (C) and the tail ends of the two bypass connecting pipes; the air inlet end of the air booster pump (2) is communicated with the air outlet end of the air source supply pipeline;
the constant temperature measuring system (C) further comprises at least one constant temperature measuring line, and the constant temperature measuring line further comprises a first pressure sensor, a first control valve, a second pressure sensor and a second control valve which are sequentially arranged on the constant temperature measuring line; a first bypass pipe is arranged on the constant temperature measuring pipe between the first pressure sensor and the first control valve, a third control valve and a reference chamber are arranged on the first bypass pipe, and a first temperature sensor which is fixed on the outer wall of the reference chamber and used for detecting the temperature of the cavity in the reference chamber is arranged on the first bypass pipe; a second bypass pipe is arranged on the constant-temperature measuring pipeline between the second pressure sensor and the second control valve, a fourth control valve, a rock chamber and a fifth control valve are sequentially arranged on the second bypass pipe, a second temperature sensor for detecting the temperature of the inner cavity of the rock core is fixed on the outer wall of the rock chamber, and the fifth control valve is communicated with the output end of the slickwater injection pipeline of the slickwater injection system (F);
the volume metering system (D) comprises a brine container (3), a graduated buret (4) and a fifth manual valve which are sequentially connected in series on a first bypass connecting pipe of the two bypass connecting pipes, and the brine container (3) is positioned at the forefront end of the first bypass connecting pipe;
the vacuumizing system (E) comprises a vacuum pump (5) and a fourth manual valve which are sequentially connected in series on a second bypass connecting pipe in the two bypass connecting pipes, and the vacuum pump (5) is positioned at the forefront end of the second bypass connecting pipe;
the system (F) comprises a slick water injection pipeline, an intermediate container (6) and an injection pump (7) are arranged on the slick water injection pipeline, and the output end of the injection pump (7) is connected with a piston in the inner cavity of the intermediate container (6);
a check valve in the air source supply system (A), a gas booster pump (2), a pressure regulating valve and a check valve in the gas booster storage system (B), a first pressure sensor, a first control valve, a second pressure sensor, a second control valve, a third control valve, a first temperature sensor, a fourth control valve, a fifth control valve and a second temperature sensor in the constant temperature measurement system (C), a vacuum pump (5) in the vacuumizing system (E), and an injection pump (7) in the slickwater injection system (F) are controlled to run by a control cabinet (8) with a PLC control sheet;
a display (9) and an input operation panel (10) are arranged on the control cabinet (8) with the PLC control sheet;
a vacuum container (11) is arranged on a second bypass connecting pipe between the vacuum pump (5) of the vacuumizing system (E) and the fourth manual valve;
the one-way valve in the air source supply system (A), the pressure regulating valve and the one-way valve in the air pressurizing storage system (B), and the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve in the constant temperature measurement system (C) are all battery valves and are controlled to be opened and closed by a control cabinet (8) with a PLC control sheet.
2. The tester for shale gas desorption capacity under the action of slickwater as claimed in claim 1, wherein: the air source supply system (A) comprises three air source supply lines, the air pressurizing storage system (B) comprises three air pressurizing lines, and the constant temperature measuring system (C) comprises four constant temperature measuring lines;
the air outlet ends of the three air source supply lines are communicated with the air inlet end of the air booster pump (2) of the air booster storage system (B) through a first four-way valve;
the air inlet ends of the three gas boosting lines are communicated with the air outlet ends of the gas booster pump (2) through a second four-way valve, and the air outlet ends of the three gas boosting lines are communicated with the air inlet ends of the constant temperature measurement system (C) and the tail ends of the two bypass connecting pipes through six-way valves;
the air inlet ends of the four constant temperature measuring lines are communicated with the six-way valve through the first five-way valve, and the fifth control valve on the four constant temperature measuring lines is communicated with the output end of the slickwater injection pipeline of the slickwater injection system (F) through the second five-way valve.
3. The shale gas desorption capacity tester under the action of slickwater as claimed in claim 1 or 2, wherein: a manual valve is arranged on an air source supply pipeline between the air bottle of the air source supply system (A) and the one-way valve.
4. The shale gas desorption capacity tester under the action of slickwater as claimed in claim 1 or 2, wherein: the rock core chamber of the constant temperature measurement system (C) further comprises a tank body (1201), a cover body (1203) for sealing an inner cavity of the tank body (1201), and a rock core cup (1204) fixed at the bottom of the inner cavity of the tank body (1201), wherein the outer diameter of the rock core cup (1204) is matched with the inner diameter of the inner cavity of the tank body (1201), the top port of the rock core cup (1204) is lower than the top port of the tank body (1201), an inflation cavity (1205) is formed between the top port of the rock core cup (1204) and the top port of the tank body (1201), and the inner cavity of the rock core cup (1204) is a shale powder filling cavity (1206); the second temperature sensor is in communication with an aeration chamber (1205) or a shale powder filling chamber (1206);
the air outlet of the second bypass pipe penetrating through the cover body (1203) is positioned in the air filling cavity (1205), and the liquid outlet end of a slickwater injection pipeline of a slickwater injection system (F) penetrating through the bottom plate of the tank body (1201) and the bottom plate of the core cup (1204) in sequence is positioned in the shale powder filling cavity (1206).
5. The instrument for testing the desorption capacity of shale gas under the action of slickwater as claimed in claim 4, wherein: and liquid outlet holes (1207) are uniformly distributed on a pipe section of the slickwater injection pipeline of the slickwater injection system (F) in the shale powder filling cavity (1206).
6. The tester for shale gas desorption capacity under the action of slickwater as claimed in claim 1, wherein: the one-way valve in the air source supply system (A), the pressure regulating valve and the one-way valve in the air pressurization storage system (B), the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve in the constant temperature measurement system (C) all adopt hydraulic valves or pneumatic valves, the hydraulic valves or the pneumatic valves are controlled to be opened and closed by corresponding hydraulic pumps or pneumatic pumps, the hydraulic pumps or the pneumatic pumps are controlled to operate by a control cabinet (8) with a PLC control sheet, and the hydraulic pumps or the pneumatic pumps are communicated with a high-pressure hydraulic source or a high-pressure pneumatic source.
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