CN112595626A - Shale gas critical desorption pressure testing device - Google Patents
Shale gas critical desorption pressure testing device Download PDFInfo
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- CN112595626A CN112595626A CN202011341751.1A CN202011341751A CN112595626A CN 112595626 A CN112595626 A CN 112595626A CN 202011341751 A CN202011341751 A CN 202011341751A CN 112595626 A CN112595626 A CN 112595626A
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- 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
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
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Abstract
The invention discloses a shale gas critical desorption pressure testing device which comprises a pressure regulator, a vacuumizing device, a pressure gauge, a desorption tank and a testing tank, wherein the pressure regulator is connected with the desorption tank through a pressure connecting pipe, the pressure gauge is fixed on the pressure connecting pipe and can test the pressure inside the desorption tank, the position, close to the bottom end, of the desorption tank is connected with the vacuumizing device through a vacuum connecting pipe, one side, far away from the pressure regulator, of the desorption tank is connected with the testing tank through a pipeline, an air exhaust assembly is fixed on the pipeline and can send the desorbed shale gas into the testing tank, the testing tank is connected with a collecting tank through a connecting pipe, and the testing tank can visually display the phenomenon that the shale gas starts to be desorbed.
Description
Technical Field
The invention relates to the technical field of shale gas preparation, in particular to a shale gas critical desorption pressure testing device.
Background
The shale gas desorption is a method for determining the gas content of shale, which means that the actual gas content is obtained by measuring the desorption behavior of a drill core or representative rock debris on site, the critical desorption pressure is the corresponding pressure value when the gas starts to be desorbed from the surface of a shale matrix in the process of shale layer depressurization, and the shale gas desorption steps comprise shale sample collection, crushing, sieving and the like.
The existing critical desorption pressure value of the shale gas is generally calculated by a formula or calculated from an adsorption isotherm, the actually measured gas content, the langmuir volume and the langmuir pressure of the shale need to be tested by the formula calculation, the process is complicated, the calculated critical desorption pressure value is a theoretical value, the critical desorption pressure of the shale gas cannot be accurately reflected, and the shale gas is put into the test after the shale is crushed and screened outside during the test, so that the loss of the shale gas is caused.
Aiming at the problems, the invention provides a shale gas critical desorption pressure testing device to solve the problems.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a critical desorption pressure testing device for shale gas comprises a pressure regulator, a vacuumizing device, a pressure gauge, a desorption tank and a testing tank, wherein the pressure regulator is connected with the desorption tank through a pressure connecting pipe, the pressure gauge is fixed on the pressure connecting pipe and can test the pressure inside the desorption tank, the position, close to the bottom end, of the desorption tank is connected with the vacuumizing device through a vacuum connecting pipe, and the vacuumizing device can absorb redundant gas in the desorption tank, so that the purity of the shale gas is ensured;
the utility model discloses a shale gas desorption test device, including desorption jar, pressure regulator, test tank, connecting pipe, test tank and collecting tank, desorption jar adopts the pipe connection to have a test tank far away from pressure regulator one side, be fixed with the subassembly of bleeding on the pipeline, the subassembly of bleeding can be sent the shale gas of desorption into in the test tank, the test tank passes through the connecting pipe and links to each other with the collecting tank, the test tank can audio-visually demonstrate that shale gas.
Further, preferably, a pressurizing opening is arranged above the pressure regulator, the pressurizing opening can increase air pressure inside the desorption tank, so that shale gas adsorbed on the surface cannot be desorbed in advance when shale rocks are crushed and ground, and a pressure reducing opening is arranged below the pressure regulator, the pressure reducing opening can reduce the air pressure inside the desorption tank, so that the ground shale rocks start to be desorbed;
the test tank is composed of transparent materials, saturated saline water is filled in the test tank, and the saturated saline water can generate a large amount of linear bubbles when shale is desorbed, so that the pressure value required by shale gas critical desorption can be visually judged.
Further, it is preferred, the desorption jar is including grinding motor, jar body, grinding component and collection subassembly, wherein, jar body top adopts the fixed disk to be fixed with the grinding motor, the output of grinding motor is fixed with grinding component, the bottom threaded connection of the jar body has the collection subassembly, just, threaded connection department scribbles sealed glue, has guaranteed the leakproofness of jar internal portion.
Further, preferably, the collecting assembly comprises a filter disc, a collecting disc and a sealing element, wherein the top end of the sealing element is provided with an external thread connected with the tank body, and the bottom end of the sealing element is fixed with a handle which can provide a stress point for the collecting assembly during disassembly and assembly;
the top end of the sealing piece is fixed with an acquisition disc through a support column, the top end of the acquisition disc is fixed with a filter disc, and the acquisition disc can be used for placing shale filtered from the filter disc, so that desorption can be better performed.
Further, it is preferred, the filter plate is the hemisphere structure, just, a plurality of filtration pores have been seted up to the filter plate outer wall, and is a plurality of the filtration pore can be through 60 ~ 230 mesh shale powder, just, the filter plate bottom is for beating the face of bits, it is the arc solid face to beat the face of bits, can place and wait to beat the bits of broken paper rock.
Further, it is preferred, grinding component includes column spinner, flexible post, grinder and breaks the subassembly, wherein, column spinner one end adopts the shaft coupling to fix the output at grinding motor, and the other end is fixed with flexible post, flexible toe end adopts the connection pad to be fixed with grinder, the inside subassembly that breaks that is provided with of grinder.
Further, it is preferred, the subassembly that smashes includes the motor that smashes and smashes the head, wherein, smash the motor and fix at the connection pad top, the setting that smashes the head and can slide from top to bottom is inside grinder, just, it links to each other with the output that smashes the motor to smash the head top.
Further, preferably, a compression spring is arranged between the top of the crushing head and the grinding device, so that the crushing motor can be assisted in crushing shale, and the crushing force is increased;
smash first bottom surface and be arc helicitic texture, the arc screw thread can carry the shale after smashing to the grinder lateral wall when grinding assembly carries out anticlockwise rotation to grind the shale.
Further, preferably, the grinding device comprises a grinding disc, auxiliary grinding pieces and a cleaning assembly, wherein the auxiliary grinding pieces and the cleaning assembly are distributed on the outer wall of the grinding disc in a staggered manner;
supplementary grinding unit is higher than the abrasive disc outer wall, and can stretch out and draw back through the spring that inside set up, further grinds shale.
Further, it is preferred, clean subassembly includes mounting, moving part and brush head, wherein, be provided with a plurality of expanding spring between mounting and the moving part, the moving part is kept away from one side of mounting and is provided with a plurality of brush heads, just, brush head and the brush head staggered arrangement on the clean subassembly of offside to make the brush head can with the complete contact of filter disc inner wall.
Compared with the prior art, the invention provides a shale gas critical desorption pressure testing device, which has the following beneficial effects:
1. the test tank is arranged, saturated saline water is filled in the test tank, linear bubbles can be seen to appear in the test tank when shale gas starts to be desorbed from the surface of shale, and when the linear bubbles do not appear, the shale gas is desorbed completely.
2. The shale gas processing device is characterized in that a grinding assembly is further arranged, when a shale sample is placed in the desorption tank, the grinding assembly moves downwards through a telescopic column until the shale sample is in contact with the shale, the smashing assembly smashes the shale, then a grinding motor rotates anticlockwise, the smashed shale is conveyed to the side wall of the grinding disc through the arc-shaped threads at the bottom of the smashing head and is ground, the shale part can be adsorbed on the inner wall of the filtering disc after grinding is completed, the attached shale is conveyed out from the filtering holes through a cleaning assembly, the whole grinding process is completed in the desorption tank, the shale gas generated during grinding can be prevented from being wasted, and resources are saved.
Drawings
FIG. 1 is a schematic overall view of a shale gas critical desorption pressure testing device;
FIG. 2 is a schematic view of a desorption tank of a shale gas critical desorption pressure testing device;
FIG. 3 is a schematic view of a grinding assembly of a shale gas critical desorption pressure testing apparatus;
FIG. 4 is a schematic view of a cleaning assembly of a shale gas critical desorption pressure testing apparatus;
in the figure: 1. a pressure regulator; 2. a vacuum pumping device; 3. a pressure gauge; 4. a desorption tank; 5. an air extraction assembly; 6. a test tank; 7. a connecting pipe; 8. a collection tank; 41. grinding the motor; 42. fixing the disc; 43. a tank body; 44. a pressure connection pipe; 45. a grinding assembly; 46. a filter tray; 47. a collection tray; 48. a seal member; 49. a vacuum connecting pipe; 451. a spin column; 452. a telescopic column; 453. a connecting disc; 454. a grinding disk; 455. a crushing motor; 456. an auxiliary grinding member; 457. cleaning the assembly; 458. a crushing head; 4571. a fixing member; 4572. a tension spring; 4573. a movable member; 4574. a brush head.
Detailed Description
Referring to fig. 1, the present invention provides a technical solution: a critical desorption pressure testing device for shale gas comprises a pressure regulator 1, a vacuumizing device 2, a pressure gauge 3, a desorption tank 4 and a testing tank 6, wherein the pressure regulator 1 is connected with the desorption tank 4 through a pressure connecting pipe 44, the pressure gauge 3 is fixed on the pressure connecting pipe 44, the pressure gauge 3 can test the pressure inside the desorption tank 4, the position, close to the bottom end, of the desorption tank 4 is connected with the vacuumizing device 2 through a vacuum connecting pipe 49, and the vacuumizing device 2 can absorb redundant gas in the desorption tank 4, so that the purity of the shale gas is ensured;
the utility model discloses a shale gas desorption test device, including desorption jar 4, pressure regulator 1, connecting pipe, test jar 6 is connected with the pipeline, be fixed with the subassembly 5 of bleeding on the pipeline, the subassembly 5 of bleeding can send the shale gas of the suction of separating into in the test jar 6, test jar 6 links to each other with collection tank 8 through connecting pipe 7, test jar 6 can audio-visually demonstrate the shale gas and begin the desorption phenomenon, and what need notice is, when the shale gas breaks up and grinds, the subassembly 5 of bleeding is in the closed condition, prevents to flow before the shale gas stripping.
In this embodiment, a pressure increasing port is arranged above the pressure regulator 1, the pressure increasing port can increase the air pressure inside the desorption tank 4, so that shale gas adsorbed on the surface cannot be desorbed in advance when shale rocks are crushed and ground, and a pressure reducing port is arranged below the pressure regulator 1, the pressure reducing port can reduce the air pressure inside the desorption tank 4, so that the ground shale rocks start to be desorbed;
the test tank 6 constitutes for transparent material, just, the inside saturated brine that is equipped with of test tank 6, saturated brine can produce a large amount of linear bubbles when the shale desorption to can audio-visually judge the required pressure value of the critical desorption of shale gas, it needs to pay attention to, the saturated brine in the test tank 6 is no longer than the two-thirds of test tank 6 volume, has reserved the space for shale gas.
Referring to fig. 2, in this embodiment, the desorption tank 4 includes grinding motor 41, jar body 43, grinding component 45 and collection subassembly, wherein, jar body 43 top adopts fixed disk 42 to be fixed with grinding motor 41, grinding motor 41's output is fixed with grinding component 45, the bottom threaded connection of jar body 43 has the collection subassembly, just, threaded connection department scribbles sealed glue, has guaranteed the inside leakproofness of jar body 43.
In a preferred embodiment, the collecting assembly comprises a filter disc 46, a collecting disc 47 and a sealing element 48, wherein the top end of the sealing element 48 is provided with an external thread to be connected with the tank 43, and the bottom end of the sealing element 48 is fixed with a handle which can provide a stress point for the assembly and disassembly of the collecting assembly;
the top end of the sealing member 48 is fixed with a collection disc 47 by adopting a support column, the top end of the collection disc 47 is fixed with a filter disc 46, the collection disc 47 can be used for placing shale rocks filtered from the filter disc 46, so that the shale rocks can be better desorbed, and the height of the collection disc 47 is consistent with the height of an air inlet of the air extraction assembly 5, so that the shale rocks can be timely sent into the test tank 6 by the air extraction assembly 5 when desorption is started.
In a preferred embodiment, the filter disc 46 is a hemisphere structure, a plurality of filter holes are formed in the outer wall of the filter disc 46, the plurality of filter holes can pass through 60-230 mesh shale powder, the bottom of the filter disc 46 is a crushing surface, and the crushing surface is an arc solid surface and can be used for placing shale to be crushed.
Referring to fig. 3, as a preferred embodiment, the grinding assembly 45 includes a rotary column 451, a telescopic column 452, a grinding device and a crushing assembly, wherein one end of the rotary column 451 is fixed to the output end of the grinding motor 41 by a coupling, the other end of the rotary column 452 is fixed to the telescopic column 452, the bottom end of the telescopic column 452 is fixed to the grinding device by a connecting disc 453, and the crushing assembly is arranged in the grinding device.
In a preferred embodiment, the crushing assembly comprises a crushing motor 455 and a crushing head 458, wherein the crushing motor 455 is fixed on the top of the connecting plate 453, the crushing head 458 is slidably disposed up and down inside the grinding device, and the top end of the crushing head 458 is connected to the output end of the crushing motor 455. it should be noted that the crushing head 458 is in a contracted state when not in operation, that is, when the grinding assembly 45 is engaged with the filter plate 46, shale is located inside the grinding plate 454, and the shale is prevented from being displaced when crushed.
In a preferred embodiment, a compression spring is arranged between the top of the crushing head 458 and the grinding device, so that the crushing motor 455 can be assisted when crushing the shale, and the crushing force is increased;
the bottom surface of the crushing head 458 is of an arc-shaped thread structure, and the arc-shaped thread can convey crushed shale to the side wall of the grinding device when the grinding assembly 45 rotates anticlockwise, so that shale is ground.
In a preferred embodiment, the grinding apparatus includes a grinding disc 454, an auxiliary grinding member 456 and a cleaning assembly 457, wherein the auxiliary grinding member 456 and the cleaning assembly 457 are distributed on the outer wall of the grinding disc 454 in a staggered manner;
the auxiliary grinding assembly 456 is higher than the outer wall of the grinding disc 454, and can extend and retract through a spring arranged inside, so that shale is further ground.
Referring to fig. 4, in a preferred embodiment, cleaning assembly 457 comprises a stationary member 4571, a movable member 4573 and a brush head 4574, wherein a plurality of extension springs 4572 are disposed between stationary member 4571 and movable member 4573, wherein a plurality of brush heads 4574 are disposed on a side of movable member 4573 remote from stationary member 4571, and wherein brush heads 4574 are staggered with respect to brush heads 4574 on the opposite cleaning assembly 457 to allow for complete contact of brush heads 4574 with the inner wall of filter tray 46.
Specifically, firstly, a shale sample is placed on a filter disc 46, a collecting assembly is installed at the bottom of a tank body 43 through threads, valves of an air pumping assembly 5 and a pressure regulator 1 are closed, a vacuumizing device 2 is opened to pump redundant gas in a desorption tank 4, the vacuumizing device 2 is closed after pumping is completed, a grinding assembly 45 is opened to crush and grind the shale, the grinded shale enters the collecting disc 47 through the filter disc 46, the air pumping assembly 5 is opened to pump away the shale gas generated in the grinding process, then the pressure in the desorption tank 4 is reduced through the pressure regulator 1, the shale gas starts to be desorbed from the surface of the shale and enters a test tank 6 through the air pumping assembly 5, when linear bubbles appear in the test tank 6, the pressure value of a pressure gauge 3 is recorded, and the desorption critical pressure value of the shale gas is obtained, when no linear bubbles are present in the test tank 6, shale gas desorption is complete.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (10)
1. The utility model provides a critical desorption pressure testing arrangement of shale gas, includes pressure regulator (1), evacuating device (2), manometer (3), desorption jar (4) and test tank (6), its characterized in that: the pressure regulator (1) is connected with the desorption tank (4) through a pressure connecting pipe (44), a pressure gauge (3) is fixed on the pressure connecting pipe (44), the pressure gauge (3) can test the pressure inside the desorption tank (4), the position, close to the bottom end, of the desorption tank (4) is connected with the vacuumizing device (2) through a vacuum connecting pipe (49), and the vacuumizing device (2) can absorb redundant gas in the desorption tank (4), so that the purity of shale gas is guaranteed;
the utility model discloses a shale gas desorption test device, including pressure regulator (1), desorption jar (4), pipeline connection have test tank (6) to keep away from pressure regulator (1) one side, be fixed with on the pipeline and bleed subassembly (5), in component (5) can send the shale gas of desorption into test tank (6) to bleed, test tank (6) link to each other with collection tank (8) through connecting pipe (7), test tank (6) can audio-visually demonstrate that shale gas begins the desorption phenomenon.
2. The shale gas critical desorption pressure testing device of claim 1, which is characterized in that: a pressurizing opening is arranged above the pressure regulator (1), the pressurizing opening can increase air pressure in the desorption tank (4), so that shale gas adsorbed on the surface cannot be desorbed in advance when shale rocks are crushed and ground, and a pressure reducing opening is arranged below the pressure regulator (1), the pressure reducing opening can reduce the air pressure in the desorption tank (4), so that the ground shale rocks start to be desorbed;
the test tank (6) is composed of transparent materials, saturated saline water is filled in the test tank (6), and the saturated saline water can generate a large amount of linear bubbles when shale gas is desorbed, so that the pressure value required by shale gas critical desorption can be visually judged.
3. The shale gas critical desorption pressure testing device of claim 1, which is characterized in that: the desorption tank (4) is including grinding motor (41), the jar body (43), grinding assembly (45) and collection subassembly, wherein, jar body (43) top adopts fixed disk (42) to be fixed with grinding motor (41), the output of grinding motor (41) is fixed with grinding assembly (45), the bottom threaded connection of the jar body (43) has the collection subassembly, just, threaded connection department scribbles sealed glue, has guaranteed the inside leakproofness of the jar body (43).
4. The shale gas critical desorption pressure testing device of claim 3, which is characterized in that: the collecting assembly comprises a filter disc (46), a collecting disc (47) and a sealing element (48), wherein the top end of the sealing element (48) is provided with an external thread connected with the tank body (43), and the bottom end of the sealing element (48) is fixed with a handle which can provide a stress point for the collecting assembly during assembling and disassembling;
the top end of the sealing member (48) is fixed with a collecting disc (47) by adopting a supporting column, the top end of the collecting disc (47) is fixed with a filtering disc (46), and the collecting disc (47) can be used for placing shale rocks filtered from the filtering disc (46), so that the desorption can be better carried out.
5. The shale gas critical desorption pressure testing device of claim 4, wherein: the filter plate (46) is the hemisphere structure, just, a plurality of filtration pores have been seted up to filter plate (46) outer wall, and is a plurality of the filtration pore can be through 60 ~ 230 mesh shale powder, just, filter plate (46) bottom is for strikeing the face, it is the arc solid face to strike the face of smashing, can place and wait to strike the garrulous shale rock.
6. The shale gas critical desorption pressure testing device of claim 2, wherein: grinding component (45) is including column spinner (451), flexible post (452), grinder and the subassembly of smashing, wherein, column spinner (451) one end adopts the shaft coupling to fix the output at grinding motor (41), and the other end is fixed with flexible post (452), flexible post (452) bottom adopts connection pad (453) to be fixed with grinder, the inside subassembly of smashing that is provided with of grinder.
7. The shale gas critical desorption pressure testing device of claim 6, which is characterized in that: the smashing assembly comprises a smashing motor (455) and a smashing head (458), wherein the smashing motor (455) is fixed to the top of the connecting disc (453), the smashing head (458) is arranged inside the grinding device in a vertically sliding mode, and the top end of the smashing head (458) is connected with the output end of the smashing motor (455).
8. The shale gas critical desorption pressure testing device of claim 7, which is characterized in that: a compression spring is arranged between the top of the crushing head (458) and the grinding device, and can assist the crushing motor (455) in crushing shale, so that the crushing force is increased;
the bottom surface of the smashing head (458) is of an arc-shaped thread structure, and the arc-shaped thread can convey smashed shale to the side wall of the grinding device when the grinding assembly (45) rotates anticlockwise, so that shale is ground.
9. The shale gas critical desorption pressure testing device of claim 6, which is characterized in that: the grinding device comprises a grinding disc (454), auxiliary grinding pieces (456) and a cleaning assembly (457), wherein the auxiliary grinding pieces (456) and the cleaning assembly (457) are distributed on the outer wall of the grinding disc (454) in a staggered mode;
the auxiliary grinding assembly (456) is higher than the outer wall of the grinding disc (454), and can extend and retract through a spring arranged inside, so that shale is further ground.
10. The shale gas critical desorption pressure testing device of claim 9, wherein: the cleaning assembly (457) comprises a fixed piece (4571), a movable piece (4573) and a brush head (4574), wherein a plurality of telescopic springs (4572) are arranged between the fixed piece (4571) and the movable piece (4573), a plurality of brush heads (4574) are arranged on one side, away from the fixed piece (4571), of the movable piece (4573), and the brush heads (4574) are staggered with the brush heads (4574) on the opposite side cleaning assembly (457), so that the brush heads (4574) can be in complete contact with the inner wall of the filter disc (46).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117386357A (en) * | 2023-10-16 | 2024-01-12 | 中国石油天然气股份有限公司吉林油田分公司 | Shale reservoir's detection device that contains gas nature |
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