Intelligent measuring device for deep core porosity based on gas adsorption method

Abstract

This invention discloses an intelligent device for measuring the porosity of deep core samples based on gas adsorption, comprising: a base on which a drill rod is mounted, and a crushing head is mounted at the lower end of the drill rod; a measuring mechanism including an outer sleeve seat disposed on the outer wall of the drill rod, an outer sleeve cylinder controlled by a rotating component at the lower end of the outer sleeve seat, an annular chamber disposed in the outer sleeve cylinder wall, an upper and lower distributed feed inlet and discharge outlet disposed on the inner wall of the annular chamber, a filter plate disposed on the feed inlet, a measuring component disposed on the outer sleeve cylinder wall, a sampling component disposed on the outer wall of the drill rod guiding material to the feed inlet and located inside the outer sleeve, a gas supply device disposed on the sampling component, and a discharge component disposed at the bottom of the annular chamber guiding material to the discharge outlet.

Description

Technical Field

[0001] This invention relates to the field of deep core porosity measurement technology, specifically to an intelligent device for measuring deep core porosity based on gas adsorption method. Background Technology

[0002] Traditional core porosity determination based on gas adsorption methods generally requires a ground-based laboratory. First, the columnar core sample taken from the ground is drilled, crushed, and sieved to obtain a particle sample of a specific size. Then, the sample is heated in a high-vacuum environment to degas it and remove the fluid pre-existing in the pores. Finally, at a constant low temperature, the adsorption isotherm of the inert gas on the sample is accurately measured by static volumetric or gravimetric methods, and then the pore structure parameters are calculated.

[0003] However, the process of obtaining core samples from underground, transporting them to the surface, and then going through complex sample preparation, scheduling, queuing, and testing typically takes weeks or even months, which cannot meet the urgent need for real-time physical property data in exploration and development decisions. At the same time, after the core is extracted from the high-temperature and high-pressure formation environment, changes such as stress release and fluid escape inevitably lead to changes in its pore structure. The surface measurement results are no longer the "in-situ" true state and cannot provide porosity data in real time during drilling.

[0004] Therefore, it is necessary to provide an intelligent device for measuring the porosity of deep rock cores based on gas adsorption to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: an intelligent device for measuring the porosity of deep rock cores based on gas adsorption method, comprising:

[0006] A base on which a drill rod is mounted, and a breaker head is mounted at the lower end of the drill rod.

[0007] The measuring mechanism includes an outer sleeve seat located on the outer wall of the drill rod, an outer sleeve cylinder adjustable by a rotating component at the lower end of the outer sleeve seat, an annular chamber in the outer sleeve wall, an upper and lower feed port and a discharge port distributed on the inner wall of the annular chamber, a filter plate on the feed port, a measuring component on the outer sleeve wall, a sampling component that guides material to the feed port and is located inside the outer sleeve on the outer wall of the drill rod, an air supply device on the sampling component, and a discharge component that guides material to the discharge port at the bottom of the annular chamber.

[0008] As a preferred embodiment of the present invention, the rotating assembly includes:

[0009] The driver is fixed on the outer casing, and its output end is equipped with a spur gear;

[0010] The spur gear ring is fixed to the inner wall of the outer sleeve and meshes with the spur gear.

[0011] As a preferred embodiment of the present invention, the lower end of the outer sleeve is rotatably equipped with a partition ring frame, and the lower end of the partition ring frame is rotatably connected to the upper end of the crushing head.

[0012] As a preferred embodiment of the present invention, the sampling component includes:

[0013] The inner sleeve is fixed to the outer wall of the drill rod, and the outer wall is fitted with a material conveying screw.

[0014] The sliding sleeve seat is axially slidably connected to the outer wall of the drill pipe and located above the inner sleeve seat. Its outer wall is equipped with a grinding roller, and its lower end is connected to the upper end of the inner sleeve seat by a spring.

[0015] The first carrier box is rotatably connected to the upper end of the sliding sleeve seat. Its lower end is provided with a grinding surface, its upper outer wall is provided with an upper slider, and the inner wall of the annular chamber is provided with a sliding strip opening that slides axially with the upper slider.

[0016] The upper cylinder ring slides on the upper part of the ring chamber and is connected to the upper slider. Its lower end is provided with an upper inclined ring surface and a guide groove corresponding to the feed port.

[0017] The lower cylinder ring is located at the bottom of the ring chamber, and its upper end is provided with a downward inclined annular surface.

[0018] As a preferred embodiment of the present invention, the outer wall of the sliding sleeve seat is provided with a rotary pusher plate.

[0019] As a preferred embodiment of the present invention, the outer end of the rotary pusher plate is provided with a brush block that contacts the filter sheet.

[0020] As a preferred embodiment of the present invention, the gas supply device includes:

[0021] The air supply box is located in the first carrier box;

[0022] The air intake is located on the upper inclined ring surface;

[0023] The air supply pipe is located inside the upper cylinder ring and connects the air inlet to the air supply box. A metering valve is installed on the pipe.

[0024] As a preferred embodiment of the present invention, the measuring component includes:

[0025] Second carrier box, located on the inner wall of the outer sleeve;

[0026] The exhaust port is located on the lower inclined ring surface, and a filter plug is provided at its upper end;

[0027] The collection tube is located inside the outer sleeve and the exhaust port is connected to the second carrier box. A gas sensor is installed on the tube.

[0028] A distance sensor, located at the top of the annular chamber, detects the displacement of the upper cylinder ring.

[0029] As a preferred embodiment of the present invention, the sorting component includes:

[0030] The ring seat is located at the bottom of the ring chamber and below the lower cylinder ring. It has an annular cavity inside, which is connected to a vertical cylindrical cavity and a collection pipe. The ring seat and the lower cylinder ring are connected by two springs.

[0031] The upper end of the slide tube is connected to the vent hole, and the lower end slides into the column cavity.

[0032] As a preferred embodiment of the present invention, the lower outer wall of the carrier box is provided with a lower slider, and the inner wall of the annular chamber is provided with a sliding groove that slides axially with the lower slider.

[0033] Compared with existing technologies, this invention provides an intelligent device for measuring the porosity of deep rock cores based on gas adsorption, which has the following advantages:

[0034] This invention utilizes a measuring mechanism mounted on the drill pipe to perform in-situ, real-time, and continuous measurement of the porosity of deep core samples. This means that sampling, sample preparation, and measurement are completed simultaneously with core fracturing, enabling real-time acquisition of porosity data of the currently encountered formation during drilling. This significantly shortens the reservoir evaluation cycle. By fracturing, sampling, and measuring in situ underground, changes in pore structure caused by stress release, drastic temperature and pressure changes, and fluid evaporation after the core is brought to the surface are avoided. The measured porosity data is closer to the original value under actual formation conditions.

[0035] This invention integrates functions such as crushing, screening, volume regularization, gas injection, and adsorption detection into a compact space by setting up a sampling ring chamber, grinding roller, gas supply component, and measuring component. This makes the sampling and measurement process more efficient, convenient, and accurate. Through differential speed control of the rotating component and drill rod, as well as the cooperation of springs and sliding sleeves, the collection, grinding and screening of rock blocks, intelligent compaction and regularization of sample volume, and post-measurement venting are automatically completed. The entire process is highly automated. By measuring the total amount of injected gas and using a gas sensor to monitor the moment when the gas penetrates the sample column, the pore volume saturation point is intelligently determined, thereby quickly calculating the porosity. This allows for continuous and frequent measurement of rock blocks at different depths during drilling, obtaining continuous high-resolution porosity profiles and overcoming the limitations of sparse coring points in traditional methods. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the measuring mechanism of the present invention;

[0038] Figure 3 This is a schematic diagram of the outer sleeve structure of the present invention;

[0039] Figure 4 This is a schematic diagram of the sampling component structure of the present invention;

[0040] Figure 5 This is a schematic diagram of the material transfer screw structure of the present invention;

[0041] Figure 6 This is a schematic diagram of the rotating component structure of the present invention;

[0042] Figure 7 This is a schematic diagram of the measuring component structure of the present invention;

[0043] Figure 8 This is a schematic diagram of the arrangement component structure of the present invention;

[0044] Figure 9 This is a schematic diagram of the upper slider structure of the present invention;

[0045] Figure 10 This is a schematic diagram of the gas supply device of the present invention;

[0046] In the diagram: 1. Base; 2. Drill rod; 3. Measuring mechanism; 4. Crushing head; 31. Outer sleeve; 32. Outer sleeve; 33. Rotating assembly; 34. Sampling assembly; 35. Air supply device; 36. Measuring assembly; 37. Discharge assembly; 321. Ring chamber; 322. Feed inlet; 323. Discharge outlet; 324. Sliding bar inlet; 325. Feed chamber; 326. Baffle ring frame; 327. Sliding bar groove; 3221. Filter plate; 331. Driver; 332. Spur gear; 333. Spur gear ring; 341. Inner sleeve; 342. Sliding sleeve seat; 343. Spring 1; 344. Carrier cylinder 1; 345. Upper cylinder ring; 346. Lower cylinder 3411. Feeding screw blade; 3421. Grinding roller; 3422. Rotary pusher plate; 3423. Brush block; 3441. Upper slider; 3442. Lower slider; 3443. Grinding surface; 3451. Guide chute; 3452. Upper inclined annular surface; 3461. Lower inclined annular surface; 351. Air supply box; 352. Air supply pipe; 353. Metering valve; 354. Air inlet; 361. Carrier cylinder box II; 362. Collection pipe; 363. Gas sensor; 364. Exhaust port; 365. Distance sensor; 366. Filter plug; 371. Ring seat; 372. Ring cavity; 373. Column cavity; 374. Slide tube; 375. Spring II. Detailed Implementation

[0047] Reference Figures 1-10 This invention provides a technical solution: an intelligent device for measuring the porosity of deep rock cores based on gas adsorption, comprising:

[0048] A base 1, on which a drill rod 2 is mounted, and a breaker head 4 is mounted at the lower end of the drill rod 2;

[0049] The measuring mechanism 3 includes an outer sleeve 31 disposed on the outer wall of the drill rod 2. The lower end of the outer sleeve 31 is provided with an outer sleeve 32 that is adjustable by a rotating component 33. The outer sleeve 32 has an annular chamber 321 in its cylinder wall. The inner wall of the annular chamber 321 has an upper and lower distributed feed inlet 322 and a discharge outlet 323. A filter 3221 is provided on the feed inlet 322. A measuring component 36 is provided on the cylinder wall of the outer sleeve 32. A sampling component 34 is provided on the outer wall of the drill rod 2 to guide material to the feed inlet 322 and located inside the outer sleeve 32. An air supply device 35 is provided on the sampling component 34. A discharge component 37 is provided at the bottom of the annular chamber 321 to guide material to the discharge outlet 323.

[0050] In this embodiment, the deep core is broken by the crushing head 4, and the crushed rock fragments are collected and sampled by the sampling component 34. The gas supply device 35 introduces measuring gas into the collected sample, and the measuring component 36 detects the saturation inflection point of the sample fully adsorbing the gas, thereby measuring the porosity of the deep core. The sample collection and measurement are then discharged by the sample discharge component 34, so as to accurately measure the porosity of the deep core at different locations during drilling.

[0051] In this embodiment, the rotating assembly 33 includes:

[0052] The driver 331 is fixed on the outer casing 31, and its output end is provided with a spur gear 332;

[0053] The spur gear ring 333 is fixed to the inner wall of the outer sleeve 32 and meshes with the spur gear 332;

[0054] The spur gear 332 is rotated by the driver 331, which drives the spur ring 333 to rotate. The spur ring 333 will then rotate synchronously with the outer sleeve 32. When the driver 331 is not started, the outer sleeve 32, the outer sleeve seat 31, and the drill rod 2 will rotate synchronously.

[0055] In this embodiment, the lower end of the outer sleeve 32 is rotatably connected to a partition ring frame 326, and the lower end of the partition ring frame 326 is rotatably connected to the upper end of the crushing head 4.

[0056] The partition ring frame 326 has uniform material inlets of a certain diameter around its perimeter. On the one hand, it ensures that the broken rock blocks can pass through the partition ring frame 326 smoothly. On the other hand, it plays a preliminary role in blocking the broken rock blocks with larger diameters, so that the material conveying screw blade 3411 can safely, smoothly and uniformly convey the rock blocks to be collected for sampling.

[0057] In this embodiment, the sampling component 34 includes:

[0058] The inner sleeve 341 is fixed to the outer wall of the drill rod 2, and the outer wall of the inner sleeve is fitted with a material conveying screw 3411; the material conveying screw 3411 is located below the discharge port 323 and inside the outer sleeve 32 cavity. When the rotating component 33 is not started, the outer sleeve 32 and the material conveying screw 3411 are in a synchronous rotation mode.

[0059] Specifically, when the drill rod 2 has not yet reached the required deep core position, the outer sleeve 32 and the feed screw 3411 rotate synchronously, and the rotation direction of the drill rod 2 also causes the feed screw 3411 to tend to feed downwards. At this time, the rock fragments crushed by the crushing head 4 can be avoided from being collected and sampled, thus ensuring the safe drilling of the drill rod 2 in the deep core. When the drill rod 2 has reached the required deep core position and it is necessary to collect and sample the crushed rock fragments, the rotating component 33 is activated to adjust the rotation direction of the drill rod 2, so that the drill rod 2 drives the feed screw 3411 to tend to feed upwards. At the same time, the rotating component 33 is activated to make the rotation of the outer sleeve 32 and the feed screw 3411 differential, so that the feed screw 3411 can feed the crushed rock fragments at the baffle frame 326 upwards, so that the crushed rock fragments at the required sampling position can be collected and sampled flexibly and in a timely manner.

[0060] The sliding sleeve seat 342 is axially slidably connected to the outer wall of the drill rod 2 and located above the inner sleeve seat 341. Its outer wall is provided with a grinding roller 3421, and its lower end is connected to the upper end of the inner sleeve seat 341 through a spring 343. The sliding sleeve seat 342 can be rotated by the drill rod 2 and can also be slid along the axial direction of the drill rod 2 by the spring 343. Initially, the space above the material conveying screw blade 3411 is empty. Under the action of the spring 343, when the carrier box 344 is at the bottom, the outer wall of the carrier box 344 can block the feed inlet 322 and the discharge outlet 323. The lower edge of the lower end of the upper inclined ring surface 3452 coincides with the lower edge of the discharge outlet 323. At this time, the upper ring 345 presses down and closely adheres to the lower ring 346 to compress the spring 375, so that the lower edge of the upper end of the lower inclined ring surface 3461 coincides with the lower edge of the discharge outlet 323.

[0061] Specifically, when the conveyor screw 3411 conveys rock blocks to the space above it, the rock blocks gradually accumulate and push the loading cylinder 344 upwards until the loading cylinder 344 is at its highest point, with the lower edge of the upper cylinder ring 345 coinciding with the lower edge of the feed inlet 322, so that the guide groove 3451 corresponds to the feed inlet 322. At this time, under the reset action of the spring 375, the inner wall of the lower cylinder ring 324 can block the discharge port 323. Therefore, a sampling ring chamber is formed between the upper inclined ring surface 3452 and the lower inclined ring surface 3461. In this case, the rock blocks above the conveyor screw 3411 can be ground by the cooperation of the grinding roller 3421 and the grinding surface 3443. In a preferred embodiment, by making small reciprocating adjustments to the drill rod 2 in both directions, the conveyor screw 3411 can be kept in a stable position. Under the premise that there is a certain amount of rock above 41, the rock above the conveyor screw 3411 is continuously ground. Whenever the guide chute 3451 corresponds to the feed port 322, the rock particles that can pass through the filter plate 3221 will be introduced into the sampling ring chamber through the feed port 322 until a certain volume of rock sample is accumulated in the sampling ring chamber. Then, the reciprocating adjustment of the drill rod 2 is stopped, and the drill rod 2 is adjusted to rotate to drive the conveyor screw 3411 to transmit material downward. Under the action of the spring 343, the upper cylinder ring 345 is slowly moved down until the upper inclined ring surface 3452 is slightly squeezed against the upper end surface of the rock sample accumulated in the sampling ring chamber. At the same time, it is necessary to avoid the discharge port 423 from communicating with the sampling ring chamber. Therefore, the rock in the sampling ring chamber can be squeezed into a regular volume shape so as to calculate the volume of the rock sample and thus facilitate the calculation of porosity.

[0062] The carrier cylinder 344 is coaxially rotatably connected to the upper end of the sliding sleeve seat 342. Its lower end is provided with a grinding surface 3443, and its upper outer wall is provided with an upper slider 3441. The inner wall of the annular chamber 321 is provided with a sliding strip opening 324 that slides axially with the upper slider 3441. Therefore, when the drill rod 2 drives the sliding sleeve seat 342 to rotate, the carrier cylinder 344 can also be controlled by the rotating component 33 to rotate the outer sleeve 32 accordingly. This makes the carrier cylinder 344 and the sliding sleeve seat 342 independent of each other in the circumferential rotation direction of the drill rod 2, but synchronous in the axial direction of the drill rod 2.

[0063] The upper cylinder ring 345 slides on the upper part of the ring chamber 321 and is connected to the upper slider 3441. Its lower end is provided with an upper inclined ring surface 3452 and a guide groove 3451 corresponding to the feed inlet 322, so that the feed inlet 322 can introduce rock powder into the sampling ring chamber.

[0064] The lower cylinder ring 346 is located at the lower part of the ring chamber 321, and its upper end is provided with a downward inclined annular surface 3461.

[0065] In this embodiment, the outer wall of the sliding sleeve seat 342 is provided with a rotary pusher plate 3422 to push the rock powder particles ground by the grinding roller 3421 to flow towards the feed inlet 322 area, thereby improving the collection efficiency.

[0066] In this embodiment, the outer end of the rotary pusher plate 3422 is provided with a brush block 3423 that contacts the filter plate 3221, so as to clean the filter plate 3221 in real time and ensure that the filter plate 3221 efficiently filters rock powder particles.

[0067] In this embodiment, the gas supply device 35 includes:

[0068] The air supply box 351 is located in the carrier box 344;

[0069] Air inlet 354 is located on the upper inclined annular surface 3452;

[0070] An air supply pipe 352 is located inside the upper cylinder ring 345 and the air inlet 354 is connected to the air supply box 351. A metering valve 353 is provided on the pipe.

[0071] Specifically, after the volume and shape of the rock sample in the sampling ring chamber are regularized, gas is introduced into the gas supply pipe 352 through the gas supply box 351, and the volume of gas introduced is measured by the metering valve 353. The gas will gradually permeate and flow from the upper end to the lower end of the sampling ring chamber and be adsorbed into the rock sample.

[0072] In this embodiment, the measuring component 36 includes:

[0073] Carrying cylinder 2 361 is located on the inner wall of outer sleeve 32;

[0074] An exhaust port 364 is located on the lower inclined annular surface 3261, and a filter plug 366 is provided at its upper end.

[0075] The collection tube 362 is located inside the outer sleeve 32 and the exhaust port 364 is connected to the second carrier box 361. A gas sensor 363 is installed on the tube.

[0076] Distance sensor 365 is located at the top of annular chamber 321 to detect the displacement of upper cylinder ring 345;

[0077] Specifically, after the gas supply device 35 is started, the gas discharged from the lower end of the sampling ring chamber is collected through the collection pipe 362. The gas supplied by the gas supply box 351 is monitored by the gas sensor 363 to determine whether the gas in the rock sample is saturated with adsorption, so as to calculate the gas flow rate. The moving distance of the upper cylinder ring 345 after the volume and shape of the rock block sample in the sampling ring chamber are regularized is measured by the distance sensor 365. The actual height of the rock sample in the sampling ring chamber can be calculated so as to calculate the effective volume of the rock block sample.

[0078] In this embodiment, the sorting component 37 includes:

[0079] The ring seat 371 is located at the bottom of the ring chamber 321 and below the lower cylinder ring 346. It has an annular cavity 372 inside, which is connected to a vertical cylindrical cavity 373 and a collection pipe 362. The ring seat 371 and the lower cylinder ring 346 are connected by a spring 375.

[0080] The upper end of the slide tube 374 is connected to the exhaust port 364, and the lower end slides into the column cavity 373.

[0081] Specifically, after the rock sample in the sampling ring chamber is saturated with adsorbed gas and the porosity is calculated, high-energy gas is supplied through the gas supply box 351 to impact the rock sample particles in the sampling ring chamber. This causes the accumulated rock sample particles in the sampling ring chamber to become loose and active. At the same time, the rotation of the drill rod 2 drives the material transfer screw 3411 to rotate and, in conjunction with the rotation component 33, controls the rotation of the outer sleeve 32. This causes the material transfer screw 3411 to tend to discharge material downwards. Therefore, the pressure in the sampling ring chamber increases, which forces the lower cylinder ring 346 to move downwards until the discharge port 323 is exposed. This allows the rock sample particles to be gradually discharged through the discharge port 323 and then discharged downwards through the material transfer screw 3411 until the upper cylinder ring 345 and the lower cylinder ring 346 come into contact and fit together. The rock particles in the space above the material transfer screw 3411 are also discharged downwards to prepare for the next porosity measurement at the location required for the deep core.

[0082] In this embodiment, the lower outer wall of the carrier box 344 is provided with a sliding block 3422, and the inner wall of the annular chamber 321 is provided with a sliding groove 327 that slides axially with the sliding block 3422, so as to improve the smoothness and stability of the movement of the carrier box 344.

[0083] In its specific implementation, it includes the following steps:

[0084] Phase 1: When the drill pipe 2 has not reached the predetermined sampling depth or is in normal drilling state, the rotating component 33 is not started. At this time, the outer sleeve 32, the material conveying screw 3411 and the drill pipe 2 rotate synchronously. The drill pipe 2 drives the crushing head 4 to rotate and crush the formation rock core. At the same time, the material conveying screw 3411 generates a downward conveying trend under the drilling rotation direction of the drill pipe, so that the crushed rock blocks are continuously pushed downward into the working area, avoiding the accumulation of rock blocks in the sampling area, ensuring smooth drilling operations, and no sampling is performed.

[0085] Second stage: When the drill rod 2 reaches the deep core layer to be measured, the differential transmission is activated, the driver 331 of the rotating component 33 is activated, the spur gear 332 is driven, and the spur gear ring 333 fixed to the outer sleeve 32 is rotated, so that the rotation speed of the outer sleeve 32 and the rotation speed of the drill rod 2 (i.e. the material conveying screw 3411) are different. At the same time, the drill rod 2 is controlled to adjust the rotation of the material conveying screw 3411, so that the spiral of the material conveying screw 3411 has an upward conveying tendency. Under the combined action of differential speed and upward conveying, the material conveying screw 3411 will efficiently convey the appropriately sized broken rock blocks that have been initially screened by the baffle frame 326 to the space above it.

[0086] The upward-conveyed rock gradually accumulates in the space above, pushing the loading cylinder 344 and upper ring 345 upward against the elastic force of spring 343. When the loading cylinder 344 reaches its highest position, the guide groove 3451 of the upper ring 345 aligns and connects with the feed inlet 322 on the wall of the ring chamber 321. At the same time, the lower ring 346 resets under the action of spring 375, blocking the discharge port 323. At this time, a closed sampling ring chamber is formed between the upper inclined ring surface 3452 and the lower inclined ring surface 3461. Rod 2 drives the sliding sleeve seat 342 and the grinding roller 3421 on it to rotate, and interacts with the grinding surface 3443 at the lower end of the carrier box 344 to roll, stir and grind the rock blocks in the space above. By rotating the drill rod 2 in a small manner, continuous grinding can be achieved while maintaining a certain amount of rock blocks. The rock blocks that have been ground into fine powder are pushed by the rotary pusher plate 3422 to the feed inlet 322, and are screened by the filter plate 32221 so that the rock sample powder particles that reach the target particle size can enter the sampling ring chamber.

[0087] Once sufficient rock sample powder has accumulated in the sampling ring chamber, the reciprocating rotation of drill rod 2 is stopped. Drill rod 2 is adjusted to drive the material conveying screw 3411 to discharge material downwards. Under the reset action of spring 343, the upper cylinder ring 345 is driven to move downwards smoothly. The upper inclined ring surface 3452 applies micro-pressure to the loose powder in the sampling ring chamber, forming a sample body with a regular shape and uniform density. During this process, distance sensor 365 accurately monitors the displacement of the upper cylinder ring 345. Combined with the known cross-sectional area of ​​the sampling ring chamber, the accurate volume of the regularized rock sample can be intelligently calculated to calculate the porosity.

[0088] The third stage: Keep the sample in a regular and compacted state, with the discharge port 323 and the inlet port 322 in a closed state. The gas supply device 35 is activated, and the adsorbate gas is quantitatively introduced from the gas supply box 351 through the gas supply pipe 352 and the metering valve 353 to the top of the sampling ring chamber (through the air inlet). The metering valve 353 accurately records and controls the total amount of gas injected. Driven by the pressure difference and concentration difference, the gas gradually permeates downward through the compacted rock sample column. The surface of the nanoscale pores inside the rock sample begins to physically adsorb gas molecules. The free gas that is not adsorbed or the gas that subsequently penetrates the sample flows out from the exhaust hole at the bottom of the ring chamber. The outflowing gas is transported to the gas sensor 363 through the collection pipe. When the gas sensor 363 first continuously detects the signal of the injected specific gas component, it indicates that the pores of the rock sample have been completely penetrated by the gas, that is, the critical point of the adsorption saturation front has been reached. This point is marked as the adsorption saturation inflection point.

[0089] Fourth stage: After the measurement is completed, the gas supply device 35 is switched to supply high-pressure, high-speed gas to impact the compacted rock sample in the sampling annular chamber, making it loose again. Under the combined action of increased pressure in the chamber and the transmission of the drill rod 2, the lower cylinder ring 346 is pressed down, and the discharge port 323 is opened. The loose rock sample powder particles are quickly discharged from the annular chamber through the discharge port 323 under the combined action of gravity, airflow and the conveying screw blade 3411 with a downward conveying tendency, and are pushed into the wellbore annulus by the conveying screw blade 3411. After emptying, under the combined action of spring 1 343 and spring 2 375, the upper cylinder ring 345 and the lower cylinder ring 346 are reset, resealing the inlet port 322 and the discharge port 323, waiting for the next measurement cycle.

[0090] The above description is merely a preferred embodiment of the invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A smart device for measuring the porosity of deep rock cores based on gas adsorption, characterized in that, It includes: A base (1) is on which a drill rod (2) is installed, and a breaker head (4) is installed at the lower end of the drill rod (2). The measuring mechanism (3) includes an outer sleeve seat (31) on the outer wall of the drill rod (2), an outer sleeve (32) at the lower end of the outer sleeve seat (31) is controlled by a rotating component (33), an annular chamber (321) is provided in the inner wall of the outer sleeve (321), an inlet (322) and a outlet (323) are provided on the inner wall of the annular chamber (321), a filter (3221) is provided on the inlet (322), a measuring component (36) is provided on the inner wall of the outer sleeve (32), a sampling component (34) is provided on the outer wall of the drill rod (2) to guide the material to the inlet (322) and located in the outer sleeve (32), an air supply device (35) is provided on the sampling component (34), and a discharge component (37) is provided at the bottom of the annular chamber (321) to guide the material to the outlet (323).

2. The intelligent device for measuring the porosity of deep rock cores based on gas adsorption method according to claim 1, characterized in that, The rotating assembly (33) includes: The driver (331) is fixed on the outer casing (31), and its output end is provided with a spur gear (332). The spur gear ring (333) is fixed to the inner wall of the outer sleeve (32) and meshes with the spur gear (332).

3. The intelligent device for measuring the porosity of deep rock cores based on gas adsorption method according to claim 1, characterized in that, The lower end of the outer sleeve (32) has a rotatable partition ring frame (326), and the lower end of the partition ring frame (326) is rotatably connected to the upper end of the crushing head (4).

4. The intelligent device for measuring the porosity of deep rock cores based on gas adsorption method according to claim 1, characterized in that, The sampling component (34) includes: The inner sleeve (341) is fixed to the outer wall of the drill rod (2), and its outer wall is fitted with a material conveying screw (3411). The sliding sleeve seat (342) is axially slidably connected to the outer wall of the drill rod (2) and located above the inner sleeve seat (341). Its outer wall is provided with a grinding roller (3421), and its lower end is connected to the upper end of the inner sleeve seat (341) by a spring (343). The first carrier box (344) is coaxially rotatably connected to the upper end of the sliding sleeve seat (342). Its lower end is provided with a grinding surface (3443), and its upper outer wall is provided with an upper slider (3441). The inner wall of the annular chamber (321) is provided with a sliding bar opening (324) that slides axially with the upper slider (3441). The upper cylinder ring (345) slides on the upper part of the ring chamber (321) and is connected to the upper slider (3441). Its lower end is provided with an upper inclined ring surface (3452) and a guide groove (3451) corresponding to the feed port (322). The lower cylinder ring (346) is located in the lower part of the ring chamber (321), and its upper end is provided with a lower inclined annular surface (3461).

5. The intelligent device for measuring the porosity of deep rock cores based on gas adsorption method according to claim 4, characterized in that, The outer wall of the sliding sleeve seat (342) is provided with a rotary pusher plate (3422).

6. The intelligent device for measuring the porosity of deep rock cores based on gas adsorption method according to claim 5, characterized in that, The outer end of the rotary pusher plate (3422) is provided with a brush block (3423) that contacts the filter plate (3221).

7. The intelligent device for measuring the porosity of deep rock cores based on gas adsorption method according to claim 3, characterized in that, The gas supply device (35) includes: An air supply box (351) is located in a carrier box (344); An air inlet (354) is located on the upper inclined annular surface (3452); An air supply pipe (352) is located inside the upper cylinder ring (345) and connects the air inlet (354) to the air supply box (351). A metering valve (353) is provided on the pipe.

8. The intelligent device for measuring the porosity of deep rock cores based on gas adsorption method according to claim 3, characterized in that, The measuring component (36) includes: Carrying cylinder two (361) is located on the inner wall of the outer sleeve (32); An exhaust port (364) is provided on the lower inclined annular surface (3261), and a filter plug (366) is provided at its upper end. The collection tube (362) is located inside the outer sleeve (32) and the exhaust port (364) is connected to the second carrier box (361). A gas sensor (363) is installed on the tube. A distance sensor (365) is located at the top of the annular chamber (321) to detect the displacement of the upper cylinder ring (345).

9. The intelligent device for measuring the porosity of deep rock cores based on gas adsorption method according to claim 8, characterized in that, The sorting component (37) includes: The ring seat (371) is located at the bottom of the ring chamber (321) and below the lower cylinder ring (346). It has an annular cavity (372) inside, which is connected to a vertical column cavity (373) and a collection pipe (362). The ring seat (371) and the lower cylinder ring (346) are connected by a spring (375). The upper end of the slide tube (374) is connected to the vent hole (364), and the lower end slides into the column cavity (373).

10. The intelligent device for measuring the porosity of deep rock cores based on gas adsorption method according to claim 3, characterized in that, The lower outer wall of the carrier box (344) is provided with a sliding block (3422), and the inner wall of the annular chamber (321) is provided with a sliding groove (327) that slides axially with the sliding block (3422).

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