A downhole drilling gas logging testing device

Abstract

The application discloses a downhole drilling gas logging testing device, which comprises a collecting and discharging mechanism and a drill pipe, a water guide pipe and a drill bit connected in sequence, a testing cylinder sleeved outside the water guide pipe is arranged on the drill pipe, a testing collecting module ring is arranged outside the water guide pipe, the testing cylinder and the water guide pipe form a testing cavity with an opening facing the drill bit, an inlet hole one is arranged at one end of the testing cylinder close to the drill bit, an outlet hole one is arranged at one end of the testing cylinder away from the drill bit, a plugging mechanism is further arranged outside the testing cylinder, the plugging mechanism comprises a sleeve shell rotatably sleeved outside the testing cylinder, the sleeve shell is respectively provided with an inlet hole two corresponding to the inlet hole one and an outlet hole two corresponding to the outlet hole one, a sealing mechanism for sealing the well is further arranged on the sleeve shell between the inlet hole two and the outlet hole two, and the plugging mechanism further comprises a control mechanism for controlling the rotation of the sleeve shell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas exploration and development, in particular to a downhole drilling gas logging testing device. BACKGROUND

[0002] In the field of oil and gas exploration and development, the traditional gas logging technology relies on analyzing the gas components carried in the drilling fluid returned from the downhole to the ground, so as to indirectly evaluate the formation characteristics. This technology detects the gas mixture such as methane, carbon dioxide and hydrogen sulfide in the drilling fluid to infer the oil and gas reservoir conditions in the formation.

[0003] At present, the drilling fluid needs to pass through a long annular pipeline of thousands of meters to return to the ground, resulting in significant time lag in information transmission and unable to reflect the real situation of the position of the drill bit in time. Secondly, the temperature, pressure and other environmental conditions of the drilling fluid change during the ascending process, which may cause the dissolved gas in the drilling fluid to be converted into free state, part of the gas is released in the degassing device, and another part may directly escape into the atmosphere after the drilling fluid reaches the ground. These processes not only increase the complexity of gas component analysis, but also reduce the accuracy of detection data.

[0004] Therefore, it is necessary to provide a downhole drilling gas logging testing device to solve the problems in the background art. SUMMARY

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a downhole drilling gas logging testing device, comprising a collection and discharge mechanism and a drill pipe, a water guide pipe and a drill bit connected in turn, a test cylinder is installed on the drill pipe outside the water guide pipe, a test collection module ring is installed outside the water guide pipe, the test cylinder and the water guide pipe form a test cavity with an opening facing the drill bit, an inlet hole one is arranged at one end of the test cylinder close to the drill bit, and an outlet hole one is arranged at one end of the test cylinder away from the drill bit, the collection and discharge mechanism comprises a push-pull ring and a sealing ring, the push-pull ring is sleeved outside the test collection module, and the push-pull ring is driven and controlled by the telescopic rod installed on the drill pipe, the sealing ring is connected to one end of the drill bit close to the test cavity through a spring one, the sealing ring is sleeved with a sealing sleeve matched with the opening of the test cavity, and a plugging mechanism is further installed outside the test cylinder, the plugging mechanism comprises a sleeve shell rotating outside the test cylinder, the sleeve shell is respectively provided with an inlet hole two corresponding to the inlet hole one and an outlet hole two corresponding to the outlet hole one, a sealing mechanism for sealing the drilling is further installed on the sleeve shell between the inlet hole two and the outlet hole two, and the plugging mechanism further comprises a control mechanism for controlling the rotation of the sleeve shell.

[0006] As a preferred technical scheme of the present application, a filter plug one is installed on the inlet hole two and the outlet hole two respectively.

[0007] As a preferred technical scheme of the present application, the control mechanism comprises a protective shell and a carrier ring, the protective shell is installed on the sleeve shell, a gear ring is installed on the shell wall of the protective shell, the carrier ring is installed on the drill rod, a motor is installed on the carrier ring, and a gear meshing with the gear ring is installed on the output end of the motor.

[0008] As a preferred technical scheme of the present application, the sealing mechanism comprises a sealing capsule installed on the outer wall of the sleeve shell, a pump body connected with the sealing capsule is also installed on the sleeve shell, a filter plug two is further arranged on the delivery end of the pump body, and a reinforced elastic rod is further arranged in the sealing capsule and circumferentially distributed on the outer wall of the sleeve shell.

[0009] As a preferred technical scheme of the present application, the reinforced elastic rod comprises a hole barrel connected with the outer wall of the sleeve shell, a sliding rod slidably connected with the end of the hole barrel away from the outer wall of the sleeve shell, the sliding rod is connected with the hole barrel through a spring three, and a supporting piece for supporting the inner wall of the sealing capsule is installed on the end of the sliding rod away from the hole barrel.

[0010] As a preferred technical scheme of the present application, the outer wall of the sealing ring is provided with an outer ring groove, the end of the sealing ring close to the test cavity is provided with a circumferentially arranged scraper groove, the sealing sleeve comprises a rotating ring rotatably installed on the bottom of the outer ring groove and a ring frame sleeved on the outer ring groove, the ring frame is connected with the rotating ring through a spring two, a supporting rod corresponding to the scraper groove is installed on the ring frame, a scraper matched with the scraper groove is installed on the supporting rod, a plurality of the scrapers are connected on a sealing ring, the sealing ring is sleeved on the outer ring groove, and the end of the scraper close to the test cavity is flush with the end of the sealing ring close to the test cavity.

[0011] As a preferred technical scheme of the present application, the drill bit is further provided with a limiting ring limiting the displacement amount of the sealing ring, the inner wall of the sealing ring is provided with a limiting cavity matched with the limiting ring, and the displacement amount of the limiting ring limiting the sealing ring is the same as the height of the scraper.

[0012] As a preferred technical scheme of the present application, the sealing ring is further provided with a positioning magnet corresponding to the scraper groove, and the supporting rod is provided with a conductor magnetically attracted with the positioning magnet.

[0013] As a preferred technical scheme of the present application, the end of the sleeve shell close to the drill bit is installed with a buffer shell covering the outside of the opening of the test cavity, and the shell wall of the buffer shell is provided with a water permeable hole.

[0014] Compared with the prior art, the present application provides a downhole drilling gas logging testing device, which has the following beneficial effects:

[0015] 1、In the present application, the control mechanism and the sealing mechanism control the backflow gas-liquid in the area near the drill bit to flow through the test cavity for collection and testing, so as to determine whether the gas-liquid flow rate flowing through the test cavity is uniform, collect and test the uniformly flowing gas-liquid, and further obtain more accurate test data, thereby improving the collection and testing efficiency and the collection and testing accuracy.

[0016] 2、The reinforcing support of the reinforcing elastic rod in the application is beneficial to improve the impact resistance of the sealed capsule to the backflow gas and liquid in the well, improve the sealing effect of the sealed capsule and the well wall, improve the fullness of the one-way gas and liquid flow test chamber, and further improve the accuracy of the gas and liquid collected while drilling.

[0017] 3、When the gas and liquid in the test chamber need to be discharged, the push-pull ring is driven by the telescopic rod to extrude the gas and liquid in the test chamber. The push-pull ring can scrape and clean the side cavity wall of the test chamber and the outer surface of the test and collection module ring. The extruded gas and liquid drives the scraper to rotate, which can continuously rotate and clean the upper end surface of the sealing ring and the lower end surface of the push-pull ring. When the gas and liquid in the test chamber are discharged, the push-pull ring is pulled back by the telescopic rod. At this time, the sealing ring enters the opening area of the test chamber again under the action of spring one. The sealing ring and the side wall of the test chamber produce a friction effect, and the friction force makes the sealing ring drive the scraper to reset to the scraper groove. Therefore, after each collection and test procedure of the test chamber is completed, the inner wall of the test chamber and the surface of the test and collection module ring are cleaned, which is beneficial to make the gas and liquid entering the test chamber each time consistent with the actual collected gas and liquid, improve the accuracy of the test data, maintain the cleanliness of the surface of the test and collection module ring, and further improve the efficiency of the test and the accuracy of the test data. The downhole drilling gas logging test is more efficient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a downhole drilling gas logging test device of the application;

[0019] Figure 2 It is a partial structure schematic diagram of a plugging mechanism of the application;

[0020] Figure 3 It is a partial structure schematic diagram of a control mechanism of the application;

[0021] Figure 4 It is a partial structure schematic diagram of a test cylinder of the application;

[0022] Figure 5 It is a partial structure schematic diagram of a test cylinder of the application; Figure 3 It is a partial structure schematic diagram of a test cylinder of the application;

[0023] Figure 6 It is a partial structure schematic diagram of a test cylinder of the application;

[0024] Figure 7 It is a partial structure schematic diagram of a test cylinder of the application;

[0025] Figure 8 It is a partial structure schematic diagram of a test cylinder of the application;

[0026] Fig. 1, drill pipe; 2, test cylinder; 3, collection and discharge mechanism; 4, buffer shell; 5, plugging mechanism; 6, reinforced elastic rod; 11, water guide pipe; 12, drill bit; 21, inlet hole one; 22, outlet hole one; 23, test cavity; 24, test collection module ring; 31, telescopic rod; 32, push-pull ring; 33, sealing ring; 34, spring one; 35, sealing sleeve; 331, outer ring groove; 332, scraper groove; 333, limiting cavity; 334, limiting ring; 351, rotating ring; 352, ring holder; 353, spring two; 354, support rod; 355, sealing ring; 356, scraper; 357, positioning magnet; 3541, conductor; 41, water inlet; 51, sleeve shell; 52, control mechanism; 53, sealing mechanism; 54, filter plug one; 511, inlet hole two; 512, outlet hole two; 521, protective shell; 522, tooth ring; 523, carrier ring; 524, motor; 525, gear; 531, sealing capsule; 532, pump body; 533, filter plug two; 61, hole cylinder; 62, sliding rod; 63, spring three; 64, support piece. DETAILED DESCRIPTION

[0027] Reference Figures 1-8 The present application provides a technical solution: a downhole drilling gas logging test device, comprising a collection and discharge mechanism 3 and a drill pipe 1, a water guide pipe 11 and a drill bit 12 connected in turn, a test cylinder 2 is installed on the drill pipe 1 and sleeved outside the water guide pipe 11, a test collection module ring 24 is installed outside the water guide pipe 11, the test cylinder 2 and the water guide pipe 11 form a test cavity 23 with an opening facing the drill bit 12, one end of the test cylinder 2 close to the drill bit 12 is provided with an inlet hole one 21, and the other end of the test cylinder 2 away from the drill bit 12 is provided with an outlet hole one 22, the collection and discharge mechanism 3 comprises a push-pull ring 32 and a sealing ring 33, the push-pull ring 32 is sleeved outside the test collection module 24, and the push-pull ring 32 is driven and controlled by a telescopic rod 31 installed on the drill pipe 1, the sealing ring 33 is connected to one end of the drill bit 12 close to the test cavity 23 through a spring one 34, and the sealing ring 33 is sleeved with a sealing sleeve 35 matched with the opening of the test cavity 23, a plugging mechanism 5 is further installed outside the test cylinder 2, the plugging mechanism 5 comprises a sleeve shell 51 rotatably sleeved outside the test cylinder 2, the sleeve shell 51 is respectively provided with an inlet hole two 511 corresponding to the inlet hole one 21 and an outlet hole two 512 corresponding to the outlet hole one 22, and a sealing mechanism 53 for sealing the well is installed on the sleeve shell 51 between the inlet hole two 511 and the outlet hole two 512, the plugging mechanism 5 further comprises a control mechanism 52 for controlling the rotation of the sleeve shell 51.

[0028] In the embodiment, filter plug one 54 is installed on the inlet hole two 511 and the outlet hole two 512 respectively.

[0029] In the embodiment, the control mechanism 52 comprises a protective shell 511 and a carrier ring 523, the protective shell 511 is installed on the sleeve shell 51, the sleeve shell 51 is provided with a tooth ring 522 on the shell wall, the carrier ring 523 is installed on the drill rod 1, a motor 524 is installed on the carrier ring 523, and a gear 525 engaged with the tooth ring 522 is installed on the output end of the motor 524; specifically, the motor 524 drives the control gear 525 to drive the tooth ring 522 to rotate, the tooth ring 522 drives the protective shell 511 and the sleeve shell 51 to rotate, so as to control the alignment or misalignment of the inlet hole one 21 and the inlet hole two 511 and the alignment or misalignment of the outlet hole one 22 and the outlet hole two 512.

[0030] In the embodiment, the sealing mechanism 53 comprises a sealing capsule 531 installed on the outer wall of the sleeve shell 51, and a pump body 532 connected with the sealing capsule 531 is further installed on the sleeve shell 51, a filter plug two 533 is further arranged on the delivery end of the pump body 532, and a reinforcing elastic rod 6 is further arranged in the sealing capsule 531 and distributed circumferentially on the outer wall of the sleeve shell 51; specifically, the pump body 532 controls the suction of the gas-liquid filled sealing capsule 531 outside the sleeve shell 51, so as to make the sealing capsule 531 adhere to the inner wall of the wellbore to change the flow trajectory of the wellbore fluid, collect the gas-liquid in the area of the drill bit 12, and guide the gas-liquid into the test chamber 23, and when the collection is completed, the pump body 532 controls the discharge of the gas-liquid in the sealing capsule 531, so as to make the sealing capsule 531 separate from the inner wall of the wellbore, so as to collect and test while drilling in the wellbore, and improve the collection and testing efficiency and accuracy; by changing the flow trajectory of the wellbore fluid, the backflow gas-liquid can flow through the test chamber 23 in one direction, and it is also beneficial to judge whether the gas-liquid flow rate flowing through the test chamber 23 is uniform, so as to collect and test the uniformly flowing gas-liquid, and further obtain more accurate test data.

[0031] In the embodiment, the reinforcing elastic rod 6 comprises a hole barrel 61 connected to the outer wall of the sleeve shell 51, a sliding rod 62 slidably connected to one end of the hole barrel 61 away from the outer wall of the sleeve shell 51, the sliding rod 62 and the hole barrel 61 are connected through a spring three 63, and a supporting piece 64 for supporting the inner wall of the sealing capsule 531 is installed on one end of the sliding rod 62 away from the hole barrel 61; that is, the reinforcing elastic rod 6 has a reinforcing support effect, which is beneficial to improve the impact resistance of the sealing capsule 531 to the backflow gas-liquid in the wellbore, improve the sealing effect of the sealing capsule 531 and the wellbore wall, improve the sufficiency of the gas-liquid flowing through the test chamber 23 in one direction, and further improve the accuracy of collecting the gas-liquid while drilling.

[0032] In the embodiment, the outer wall of the sealing ring 33 is provided with an outer ring groove 331, and the end of the sealing ring 33 close to the test cavity 23 is provided with circumferentially arranged scraper grooves 332. The sealing sleeve 35 comprises a rotating ring 351 rotatably installed on the bottom of the outer ring groove 331 and a ring frame 352 sleeved on the outer ring groove 331. The ring frame 352 is connected with the rotating ring 351 through a spring 353. The ring frame 352 is provided with a support rod 354 corresponding to the scraper groove 332. The support rod 354 is provided with a scraper 356 matched with the scraper groove 332. A plurality of scrapers 356 are connected on a sealing ring 355, which is sleeved on the outer ring groove 331. The end of the scraper 356 close to the test cavity 23 is flush with the end of the sealing ring 355 close to the test cavity 23. Specifically, during the process of gas-liquid passing through the test cavity 23 and the process of gas-liquid being tested in the test cavity 23, the upper end of the sealing ring 33 and the sealing sleeve 35 is in real time at the opening of the test cavity 23, which plays a real-time plugging role for the test cavity 23. That is to say, when it is necessary to discharge the gas-liquid in the test cavity 23, at this time, the push-pull ring 32 is driven by the telescopic rod 31 to move close to the sealing ring 33 in a tight manner. The push-pull ring 32 extrudes the gas-liquid in the test cavity 23. At the same time, the push-pull ring 32 can scrape and clean the side cavity wall of the test cavity 23 and the outer surface of the test and collection module ring 24. The extruded gas-liquid pushes the sealing ring 33 and the sealing sleeve 35 away from the opening of the test cavity 23, and the gas-liquid in the test cavity 23 is discharged outward. When the sealing ring 33 and the sealing sleeve 35 are separated from the test cavity 23, the extruded gas-liquid continues to be discharged. At this time, the scraper 356 is driven by the spring 353 to separate from the scraper groove 332. The extruded gas-liquid pushes the scraper 356 to rotate. The end of the scraper 356 close to the sealing ring 33 can continuously rotate and scrape and clean the upper end surface of the sealing ring 33. When the push-pull ring 32 approaches and contacts the scraper 356, the end of the scraper 356 close to the push-pull ring 32 can continuously rotate and scrape and clean the lower end surface of the push-pull ring 32. After the gas-liquid in the test cavity 23 is discharged, the push-pull ring 32 is pulled back by the telescopic rod 31. At this time, the sealing ring 33 is driven by the spring 34 to enter the opening area of the test cavity 23 again. The sealing ring 355 rubs against the side wall of the test cavity 23. The friction force makes the sealing ring 355 drive the scraper 356 to reset to the scraper groove 332. Therefore, after each collection and test process of the test cavity 23 is completed, the inner wall of the test cavity 23 and the surface of the test and collection module ring 24 are cleaned, which is beneficial to make the gas-liquid entering the test cavity 23 each time consistent with the actually collected gas-liquid, improve the accuracy of test data, maintain the cleanliness of the surface of the test and collection module ring 24, and further improve the efficiency of the test and the accuracy of the test data.

[0033] In the embodiment, the drill bit 12 is further provided with a limiting ring 334 for limiting the displacement of the sealing ring 33, the inner wall of the sealing ring 33 is provided with a limiting cavity 333 matched with the limiting ring 334, and the displacement of the sealing ring 33 is limited by the limiting ring 334 to be the same as the height of the scraper 356, so that the scraper 356 can be used to clean the sealing ring 33 and the push-pull ring 32 by rotating scraping.

[0034] In the embodiment, the sealing ring 33 is further provided with a positioning magnet 357 corresponding to the scraper groove 332, and the support rod 354 is provided with a conductor 3541 matched with the positioning magnet 357 in magnetic attraction; so that the support rod 354 in the rotating process is actively positioned in the stop position by the magnetic force of the positioning magnet 357 attracting the conductor 3541 in the process of gradually stopping rotating, so that the scraper 356 is aligned with the scraper groove 332.

[0035] In the embodiment, the sleeve shell 51 is provided with a buffer shell 4 covering the opening of the test cavity 23 at one end close to the drill bit 12, and the shell wall of the buffer shell 4 is provided with a water permeable hole 41; so as to weaken the impact degree of the gas-liquid flow in the opening area of the test cavity 23, so as to discharge the gas-liquid in the test cavity 23.

[0036] In the specific implementation, when the drill pipe 1 is drilling, if it is necessary to collect and test the area drilled by the drill bit 12, at this time, the sleeve 51 is controlled to rotate by the control mechanism 52, so that the inlet hole one 21 is aligned with the inlet hole two 511 and the outlet hole one 22 is aligned with the outlet hole two 512, and then the gas-liquid filling sealing bag 531 outside the suction sleeve 51 is controlled to suck by the pump body 532, so that the sealing bag 531 is tightly sealed with the inner wall of the well, the flow trajectory of the drilling fluid in the well is changed, the gas and liquid in the area of the drill bit 12 are collected, and are introduced into the test cavity 23, when the gas and liquid flowing in the test cavity 23 flow uniformly, the gas and liquid in the sealing bag 531 are discharged by the pump body 532, so that the sealing bag 531 is separated from the inner wall of the well, and then the sleeve 51 is controlled to rotate by the control mechanism 52, so that the inlet hole one 21 is misaligned with the inlet hole two 511 and the outlet hole one 22 is misaligned with the outlet hole two 512, and then the gas and liquid in the test cavity 23 are tested and collected by the test and collection module ring 24, after the data testing and collection are completed, the gas and liquid in the test cavity 23 are discharged, at this time, the push-pull ring 32 is moved close to the sealing ring 33 in the direction of the telescopic rod 31, the push-pull ring 32 extrudes the gas and liquid in the test cavity 23, and at the same time, the push-pull ring 32 can scrape and clean the side cavity wall of the test cavity 23 and the outer surface of the test and collection module ring 24, the extruded gas and liquid drives the sealing ring 33 and the sealing sleeve 35 to separate from the opening of the test cavity 23, and the gas and liquid in the test cavity 23 are discharged outward, wherein, after the sealing ring 33 and the sealing sleeve 35 separate from the test cavity 23, the extruded gas and liquid continuously discharges, at this time, the scraper 356 is driven to separate from the scraper groove 332 under the action of the spring two 353, the extruded gas and liquid drives the scraper 356 to rotate, the end of the scraper 356 close to the sealing ring 33 can continuously rotate and scrape and clean the upper end surface of the sealing ring 33, when the push-pull ring 32 approaches the scraper 356, the end of the scraper 356 close to the push-pull ring 32 can continuously rotate and scrape and clean the lower end surface of the push-pull ring 32, after the gas and liquid in the test cavity 23 are discharged, the push-pull ring 32 is pulled back by the telescopic rod 31, at this time, the sealing ring 33 enters the opening area of the test cavity 23 again under the action of the spring one 34, the sealing ring 355 rubs against the side wall of the test cavity 23, the friction force makes the sealing ring 355 drive the scraper 356 to reset to the scraper groove 332, and then the test of gas logging while drilling is carried out in the well.

[0037] The above is only a preferred specific implementation of the application, but the protection scope of the application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A downhole drilling gas logging testing device, comprising a collection discharge mechanism (3) and a drill pipe (1), a water guide pipe (11) and a drill bit (12) connected in sequence, characterized in that, The drill pipe (1) is provided with a test cylinder (2) sleeved outside a guide pipe (11), a test collection module ring (24) is installed outside the guide pipe (11), the test cylinder (2) and the guide pipe (11) form a test cavity (23) with an opening facing a drill bit (12), one end of the test cylinder (2) close to the drill bit (12) is provided with an inlet hole one (21), and one end of the test cylinder (2) away from the drill bit (12) is provided with an outlet hole one (22), the collection and discharge mechanism (3) comprises a push-pull ring (32) and a sealing ring (33), the push-pull ring (32) is sleeved outside the test collection module ring (24), and the push-pull ring (32) is driven and controlled through the telescopic rod (31) installed on the drill pipe (1), the sealing ring (33) is connected with one end of the drill bit (12) close to the test cavity (23) through a spring one (34), the sealing ring (33) is sleeved with a sealing sleeve (35) matched with the opening of the test cavity (23), and the test cylinder (2) is further provided with a plugging mechanism (5) outside, the plugging mechanism (5) comprises a sleeve shell (51) rotatably sleeved outside the test cylinder (2), the sleeve shell (51) is respectively provided with an inlet hole two (511) corresponding to the inlet hole one (21) and an outlet hole two (512) corresponding to the outlet hole one (22), and a sealing mechanism (53) for sealing a well is further installed on the sleeve shell (51) between the inlet hole two (511) and the outlet hole two (512), the plugging mechanism (5) further comprises a control mechanism (52) for controlling the rotation of the sleeve shell (51); The sealing mechanism (53) comprises a sealing bag (531) installed on the outer wall of the sleeve shell (51), the sleeve shell (51) is further provided with a pump body (532) connected with the sealing bag (531), the conveying end of the pump body (532) is further provided with a filter plug two (533), and the inside of the sealing bag (531) is further provided with a reinforced elastic rod (6) distributed in the circumferential direction on the outer wall of the sleeve shell (51); The reinforced elastic rod (6) comprises a hole barrel (61) connected to the outer wall of the sleeve shell (51), one end of the hole barrel (61) away from the outer wall of the sleeve shell (51) is slidably connected with a sliding rod (62), the sliding rod (62) and the hole barrel (61) are connected through a spring three (63), and one end of the sliding rod (62) away from the hole barrel (61) is provided with a supporting piece (64) for supporting the inner wall of the sealing bag (531). The outer wall of the sealing ring (33) is provided with an outer ring groove (331), and the sealing ring (33) is provided with a circumferentially arranged scraper groove (332) at one end close to the test cavity (23). The sealing sleeve (35) comprises a rotating ring (351) rotatably installed on the groove bottom of the outer ring groove (331) and a ring frame (352) sleeved on the outer ring groove (331). The ring frame (352) is connected with the rotating ring (351) through a spring (353). The ring frame (352) is provided with a support rod (354) corresponding to the scraper groove (332). The support rod (354) is provided with a scraper (356) matched with the scraper groove (332). A plurality of scrapers (356) are connected on a sealing ring (355), and the sealing ring (355) is sleeved on the outer ring groove (331). The end of the scraper (356) close to the test cavity (23) is flush with the end of the sealing ring (355) close to the test cavity (23).

2. The downhole drilling gas logging testing device of claim 1, wherein, The inlet hole two (511) and the outlet hole two (512) are respectively provided with a filter plug one (54).

3. The downhole drilling gas logging testing device of claim 1, wherein, The control mechanism (52) comprises a protective shell (521) and a carrier ring (523). The protective shell (521) is installed on the sleeve shell (51), and the shell wall of the protective shell (521) is provided with a tooth ring (522). The carrier ring (523) is installed on the drill rod (1), and the carrier ring (523) is provided with a motor (524). The output end of the motor (524) is provided with a gear (525) engaged with the tooth ring (522).

4. The downhole drilling gas logging testing device of claim 1, wherein, The drill bit (12) is further provided with a limiting ring (334) limiting the displacement amount of the sealing ring (33). The inner wall of the sealing ring (33) is provided with a limiting cavity (333) matched with the limiting ring (334). The limiting displacement amount of the sealing ring (33) is the same as the height of the scraper (356).

5. The downhole drilling gas logging testing device of claim 1, wherein, The sealing ring (33) is further provided with a positioning magnet (357) corresponding to the scraper groove (332). The support rod (354) is provided with a conductor (3541) matched with the positioning magnet (357) in magnetic attraction.

6. The downhole drilling gas logging testing device of claim 1, wherein, The sleeve shell (51) is provided with a buffer shell (4) covering the opening of the test cavity (23) at one end close to the drill bit (12). The shell wall of the buffer shell (4) is provided with a water permeable hole (41).

Images