A measurement while drilling system

Abstract

This invention relates to the field of geological exploration technology, and in particular to a measurement-while-drilling (MWD) system. Addressing the problem in existing MWD systems where the inconvenience of cleaning impurities at the inlet during operation leads to poor water intake and high turbidity in the acquired water samples, the present invention proposes the following solution: It includes an outer shell and a sampling unit housed within the shell. An inlet is formed on the outer wall of the shell, and a partition is fixed inside the inlet. An installation port is formed in the middle of the partition, and a screen is installed inside the installation port. An inlet pipe, coaxially aligned with the installation port, is installed on the inner outer wall of the partition near the partition. A one-way valve is installed on the inlet pipe, and a baffle is installed inside the inlet. This invention allows for convenient filtration and cleaning of impurities at the inlet during sampling, and also effectively performs secondary filtration and separate sampling of the water sample. This not only effectively reduces the content of slag and stone in the water sample but also allows for separate collection of water samples from different locations.

Description

Technical Field

[0001] This invention relates to the field of geological exploration technology, and in particular to a measurement-while-drilling system. Background Technology

[0002] In geological exploration, measurement-while-drilling systems are often used to survey underground conditions. In order to accurately determine the geological composition beneath the surface, it is necessary to sample relevant underground components during the drilling process, among which the analysis of the composition of groundwater is an important aspect.

[0003] Because the drill pipe mixes a lot of soil into the water during its movement, the composition of the sampled groundwater becomes complex. Current measurement-while-drilling (MWD) systems often encounter obstacles at the intake point due to soil and debris in the water, hindering pumping and causing soil contamination and high turbidity in the sampled water. Therefore, this proposal suggests a new MWD system. Summary of the Invention

[0004] The present invention proposes a measurement while drilling system that solves the problem that existing measurement while drilling systems are inconvenient to clean impurities at the inlet during operation, resulting in poor water intake and high turbidity of the obtained water samples.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A measurement while drilling system includes a housing and a sampling unit disposed within the housing. The outer wall of the housing has a feed inlet, a partition is fixed inside the feed inlet, an installation port is provided in the middle of the partition, and a blocking net is installed inside the installation port. A feed pipe coaxially disposed with the installation port is installed on the inner side outer wall of the partition near the housing. A one-way valve is installed on the feed pipe. A baffle is installed inside the feed inlet, and a drive assembly for driving the baffle to move is installed outside the feed pipe.

[0007] The sampling unit includes a sampling mechanism and a collection mechanism. The sampling mechanism includes a filter box installed inside the housing, a filter screen installed inside the filter box, and a piston cylinder fixed to one side of the outer wall of the filter box. The other end of the feed pipe passes through the filter box and extends to the inside of the filter screen. The filter box has a connection port communicating with the piston cylinder on the side near the piston cylinder. A piston plate is installed inside the piston cylinder, and an air supply pipe is installed on the side of the piston cylinder away from the filter box. A drive shaft is rotatably connected inside the filter screen and coaxially arranged therewith. A cleaning frame for cleaning the inner wall of the filter screen is installed outside the drive shaft. One end of the drive shaft extends to the outside of the filter screen near the piston cylinder and is connected to the piston plate through a transmission assembly.

[0008] The collection mechanism includes a conveying pipe fixed on the filter box, an outlet pipe fixed on the inlet pipe, and multiple collection tanks installed between the conveying pipe and the inlet pipe. A one-way valve is installed on the outlet pipe. Fixed pipes are installed at both ends of the collection tanks. Multiple connecting pipes for installing the fixed pipes are installed on the outer wall of the side opposite to the inlet pipe, and solenoid valves are installed on the connecting pipes.

[0009] The above technical solution can conveniently filter and clean impurities at the water inlet during sampling, and can also effectively perform secondary filtration and separate sampling of water samples. This not only effectively reduces the content of slag and stone in the water sample, but also allows for separate collection of water samples from different locations.

[0010] As a further improvement to the above solution, the filter screen is a cylindrical structure, the drive shaft is coaxially arranged with the filter screen, the sweeping frame is a rectangular structure, and the outer walls of the two long sides of the sweeping frame abut against the inner walls of the two ends of the filter screen, and the outer wall of the wide side of the sweeping frame abuts against the side wall of the filter screen.

[0011] The above technical solution can drive the sweeping frame to rotate while sampling, thereby scraping off the impurities attached to the inner wall of the filter screen.

[0012] As a further improvement to the above solution, the drive assembly includes an electric telescopic rod installed on the outer walls of both sides of the feed pipe and two connecting rods respectively fixed to one end of the output shaft of the two electric telescopic rods. The other end of the two connecting rods passes through the partition and is fixedly connected to the baffle. A battery and a microcontroller are installed inside the housing. The input ends of the solenoid valve and the electric telescopic rod are electrically connected to the output end of the microcontroller.

[0013] The above technical solution allows the inlet to be sealed when sampling is not required, while the baffle can be moved to the outside of the inlet when sampling is required.

[0014] As a further improvement to the above solution, the transmission assembly includes a connecting rod hinged to the outer wall of the piston plate near the connection port and a transmission rack hinged to the other end of the connecting rod. The transmission rack is movably fitted with a fixed sleeve, which is fixed to the outer wall of the filter screen, and the transmission rack meshes with a transmission gear.

[0015] The above technical solution can be used to drive the transmission shaft to rotate by moving the piston plate, thereby realizing the linkage between the structures.

[0016] As a further improvement to the above solution, a cleaning assembly for scraping off impurities from the surface of the interception net is installed on the partition. The cleaning assembly includes a linkage rod rotatably connected to the partition and a scraper fixed to one end of the linkage rod. The scraper is located on the outside of the partition near the baffle and abuts against the surface of the interception net. The length of the scraper is greater than the diameter of the interception net. The other end of the drive shaft extends to the outside of the filter box and is connected to the linkage rod.

[0017] The above technical solution can drive the scraper to rotate while the drive shaft rotates, thereby scraping off the slag and stone adhering to the surface of the interception net during sampling.

[0018] As a further improvement to the above solution, a gate valve is installed on the fixed pipe, and the connecting pipe and the fixed pipe are connected by a water pipe joint.

[0019] The above technical solution allows the gate valve to seal the two fixed pipes when the collection tank is removed from the outer casing, preventing the water sample from flowing out of the collection tank.

[0020] As a further improvement to the above solution, the diameter of the connection port is the same as the inner diameter of the piston cylinder, a limit block is fixed on the inner wall of the piston cylinder near the connection port, and a sealing ring is installed on the outer ring of the piston plate.

[0021] The above technical solution ensures that the diameter of the connection port is the same as the inner diameter of the piston cylinder, which can effectively prevent water samples from entering the piston cylinder and being unable to be discharged. The setting of the limiting block can prevent the piston plate from falling out of the piston cylinder. The outer ring of the piston plate is equipped with a sealing ring, which enhances the sealing between the outer ring of the piston plate and the inner ring of the piston cylinder.

[0022] As a further improvement to the above solution, an operation port is provided on the outer wall of the outer shell, and a detachable sealing cover is installed inside the operation port.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. Through the cooperation between the sampling mechanism and the collection mechanism, groundwater can be drawn into the filter box after being filtered by the exhaust air during sampling. Then, under the secondary filtration of the filter screen, the water in the filter box is pressed into the conveying pipe. At the same time, the solenoid valve on the connecting pipe connected to the corresponding collection tank is opened by the microcontroller, so that the water after secondary filtration can be pressed into the collection tank. By controlling the opening and closing of the solenoid valves on different connecting pipes, groundwater from different locations can be stored in different collection tanks.

[0025] 2. The baffle can be used to block the feed inlet when sampling is not required, preventing soil from blocking the feed inlet during the drill rod's movement. In conjunction with the drive mechanism, the baffle can be pushed out of the feed inlet before sampling, thereby clearing away the soil around the feed inlet and facilitating the entry of groundwater into the feed inlet.

[0026] 3. By setting up the cleaning component, the scraper can be continuously rotated during sampling, thereby scraping away the soil attached to the surface of the interception net, thus ensuring that the interception net has good permeability. Attached Figure Description

[0027] Figure 1 This is a perspective view of the present invention;

[0028] Figure 2 This is a top sectional view of the present invention;

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 for Figure 2 Schematic diagram of the middle filtration mechanism and transmission components;

[0031] Figure 5 This is a schematic diagram of the filter screen.

[0032] Explanation of key symbols:

[0033] 1. Outer shell; 2. Operating port; 3. Sealing cover; 4. Gas supply pipe; 5. Solenoid valve; 6. Piston cylinder; 7. Battery; 8. Microcontroller; 9. Piston plate; 10. Filter box; 11. Filter screen; 12. Connecting rod; 13. Transmission gear; 14. Transmission rack; 15. Transmission shaft; 16. Limit block; 17. Sweeping frame; 18. Electric telescopic rod; 19. Linkage rod; 20. Collection tank; 21. Feed pipe; 22. Conveying pipe; 23. Fixed pipe; 24. Discharge pipe; 25. Connecting pipe; 26. Water pipe joint; 27. Gate valve; 28. Interception net; 29. ​​Connecting rod; 30. Baffle; 31. Scraper; 32. Feed inlet; 33. Partition; 34. Sealing gasket; 35. Fixing sleeve. Detailed Implementation

[0034] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0035] Example 1:

[0036] Please combine Figure 1-5This embodiment of a measurement-while-drilling system includes a housing 1 and a sampling unit disposed within the housing 1. An operation port 2 is provided on the outer wall of the housing 1, and a detachable sealing cover 3 is installed inside the operation port 2. A feed inlet 32 ​​is provided on the outer wall of the housing 1, and a partition 33 is fixed inside the feed inlet 32. An installation opening is provided in the middle of the partition 33, and a blocking net 28 is installed inside the installation opening. A feed pipe 21, coaxially arranged with the installation opening, is installed on the outer wall of the partition 33 near the inner side of the housing 1. A one-way valve is installed on the feed pipe 21. A baffle 30 for sealing the feed inlet 32 ​​is installed inside the feed pipe 21. An external drive assembly for moving the baffle 30 is installed. The drive assembly includes an electric telescopic rod 18 installed on the outer walls of both sides of the feed pipe 21 and two connecting rods 29 respectively fixed to one end of the output shaft of the two electric telescopic rods. The other ends of the two connecting rods 29 pass through the partition 33 and are fixed to the baffle 30. A battery 7 and a microcontroller 8 are installed inside the housing 1. The input end of the electric telescopic rod 18 is electrically connected to the output end of the microcontroller 8. The microcontroller model is M68300. The microcontroller 8 is connected to the ground control equipment through a data cable. The operation of the electric telescopic rod 18 is controlled by the mass output of the ground equipment.

[0037] Both connecting rods 29 are fitted with sealing gaskets 34 on their exterior. The sealing gaskets are located on the side of the partition 33 where the feed pipe 21 is installed. The sealing gaskets 34 are used to seal the gap between the connecting rods 29 and the partition 33 after the baffle 30 is pushed out of the feed inlet.

[0038] The sampling unit includes a sampling mechanism and a collection mechanism. The sampling mechanism includes a filter box 10 installed inside the outer casing 1, a filter screen 11 installed inside the filter box 10, and a piston cylinder 6 fixed to one side of the outer wall of the filter box 10. The mesh count of the filter screen 11 is larger than that of the interception net 28. The other end of the feed pipe 21 passes through the filter box 10 and extends to the inside of the filter screen 11. A connection port communicating with the piston cylinder 6 is opened on the side of the filter box 10 near the piston cylinder 6. A piston plate 9 is installed inside the piston cylinder 6, and a gas supply is installed on the side of the piston cylinder 6 away from the filter box 10. Pipe 4, the gas supply pipe 4, is connected to an external gas supply device. Gas is supplied to the gas supply pipe 4 through the gas supply device, increasing the gas volume inside the piston cylinder 6. This allows the piston plate 9 to move closer to the connection port, thus expelling water from the filter box 10. Conversely, when air is drawn out of the piston cylinder 6 through the gas supply device, the piston plate 9 moves further away from the connection port, creating negative pressure inside the filter box 10. This allows groundwater to be drawn into the filter box 10. A drive shaft, coaxially arranged with the filter screen 11, is rotatably connected inside the filter screen 11. 15. One end of the drive shaft 15 extends to the outside of the filter screen cover 11 near the piston cylinder 6 and is connected to the piston plate 9 via a transmission assembly. The filter screen cover 11 has a cylindrical structure. The drive shaft 15 is coaxially arranged with the filter screen cover 11. The sweeping frame 17 has a rectangular structure, and the outer walls of the two long sides of the sweeping frame 17 abut against the inner walls of the two ends of the filter screen cover 11, respectively. The outer wall of the wide side of the sweeping frame 17 abuts against the side wall of the filter screen cover 11. The transmission assembly includes a connecting rod 12 hinged to the outer wall of the piston plate 9 near the connection port and a connecting rod 12 hinged to the other end of the connecting rod 12. The transmission rack 14 is movably fitted with a fixed sleeve 35, which is fixed to the outer wall of the filter screen 11. The transmission rack 14 meshes with the transmission gear 13. After the water sample sucked in from the feed pipe 21 enters the filter screen 11, the impurities in the water sample are intercepted inside the filter screen 11, thus performing secondary filtration on the water sample. The sweeping frame 17 is driven by the piston plate 9 to continuously reciprocate, thereby scraping off the impurities attached to the inner wall of the filter screen 11 to ensure that the filter screen 11 has good water permeability.

[0039] The diameter of the connection port is the same as the inner diameter of the piston cylinder 6 to prevent water sample from entering the piston cylinder 6 and being unable to be discharged. A limit block 16 is fixed on the inner wall of the piston cylinder 6 near the connection port. The limit block 16 is set to prevent the piston plate 9 from falling out of the piston cylinder 6. A sealing ring is installed on the outer ring of the piston plate 9.

[0040] The collection mechanism includes a conveying pipe 22 fixed to the filter box 10, a discharging pipe 24 fixed to the inlet pipe 21, and multiple collection tanks 20 installed between the conveying pipe 22 and the inlet pipe 21. A second check valve is installed on the discharging pipe 24, and a first check valve is installed on the side of the connection point between the inlet pipe 21 and the discharging pipe 24 near the filter box 10. The first check valve is used to prevent water samples in the filter box 11 from being discharged through the inlet pipe 21. Fixed pipes 23 are installed at both ends of the collection tanks 20. Multiple connecting pipes 25 for installing the fixed pipes 23 are installed on the outer wall of the side of the conveying pipe 22 opposite to the inlet pipe 21, and solenoid valves are installed on the connecting pipes 25. 5. One-way valve 2 is installed on the side of multiple connecting pipes 25 near the feed pipe 21. One-way valve 2 can prevent water sample from entering the discharge pipe 24 when water sample is drawn. A gate valve 27 is installed on the fixed pipe 23. The connecting pipe 25 and the fixed pipe 23 are connected by water pipe joints 26. By controlling the opening and closing of the solenoid valve 5 on the connecting pipe 25 connected to different collection tanks 20, the water sample in the feed pipe 22 can be controlled to enter different collection tanks, thereby achieving the purpose of separate sampling. The gate valve 27 is opened after the collection tank 20 is installed. When the collection tank 20 is taken out from the outer shell 1, the gate valve 27 can be closed.

[0041] The implementation principle of this embodiment is as follows: During sampling, the ground equipment first sends a command to the microcontroller to control the extension of the two electric telescopic rods 18, thereby pushing the baffle 30 outward from the feed inlet 32 ​​until the baffle 30 moves to the outside of the feed inlet and reaches the extension limit of the electric telescopic rods 18, at which point the extension of the electric telescopic rods 18 is stopped. Then, the microcontroller 8 controls the solenoid valve 5 on the connecting pipe 25 connected to one of the collection tanks 20 to open. Subsequently, the air in the piston cylinder 6 is extracted outward by the external air supply equipment, causing the piston plate 9 to move away from the connecting port, thereby drawing the air in the filter box 10 into the piston cylinder 6. The water sample then enters the feed pipe 2 through the feed inlet and the connecting mesh 28. The water sample enters the filter screen 11 and then the external air supply device inputs air into the piston cylinder 6, causing the piston plate 9 to move towards the side closer to the connection port. This forces the air in the piston cylinder 6 into the filter box 10, increasing the pressure inside the filter box 10. The water sample in the filter box 10 is then discharged through the feed pipe 22 and finally enters the corresponding collection tank 20. By continuously driving the piston plate 9 to reciprocate several times, enough water sample can be collected and stored in the collection tank 20. After sampling, the solenoid valve 5 on the connecting pipe 25 connected to the collection tank 20 is closed, and then the electric telescopic rod 18 is activated to retract the baffle 30 back into the feed inlet 32.

[0042] During the reciprocating movement of the piston plate 9, the rack is driven to reciprocate through the connecting rod 12, which in turn drives the transmission gear 13 to rotate. After the transmission gear 13 rotates, it drives the transmission shaft 15 to rotate, so that the sweeping frame 17 can rotate continuously. During the sampling process, the impurities attached to the inner wall of the filter screen 21 are scraped off, thus ensuring the water permeability of the filter screen 11. While the discharge pipe 24 continuously drains water into the feed pipe 21, it also uses the impact force of the water to flush the impurities remaining in the feed inlet 32 ​​to the outside of the feed inlet 32.

[0043] Before each sampling, the piston plate 9 can be driven to move back and forth multiple times to drain the water sample remaining in the filter box 10, feed pipe 21 and feed pipe 22 from the previous sampling point.

[0044] Example 2:

[0045] Combination Figure 2-4 Based on Embodiment 1, this embodiment is further improved in that: a cleaning assembly for scraping off impurities from the surface of the interceptor net 28 is installed on the partition 33. The cleaning assembly includes a linkage rod 19 rotatably connected to the partition 33 and a scraper 31 fixed to one end of the linkage rod 19. The scraper 31 is located outside the partition 33 near the baffle 30 and abuts against the surface of the interceptor net 28. The length of the scraper 31 is greater than the diameter of the interceptor net 28. The other end of the drive shaft 15 extends to the outside of the filter box 10 and is connected to the linkage rod 19. A drive bevel gear is installed at one end of the drive shaft 15 outside the filter box 10, and a driven bevel gear meshing with the drive bevel gear is installed at one end of the linkage rod 19.

[0046] The implementation principle of this embodiment is as follows: During the sampling process, the rotation of the transmission shaft 15 can drive the linkage rod 19 to rotate together, so that the scraper 31 can rotate continuously, thereby scraping off the impurities attached to the surface of the interception net 28 when the water sample is taken.

[0047] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A measurement-while-drilling system, comprising a housing and a sampling unit disposed within the housing, characterized in that, The outer wall of the shell is provided with a feed port, a partition is fixed inside the feed port, an installation port is provided in the middle of the partition, an intercepting net is installed inside the installation port, a feed pipe is installed on the inner side of the outer wall of the shell and is coaxial with the installation port, a one-way valve is installed on the feed pipe, a baffle is installed inside the feed port, and a drive assembly for driving the baffle to move is installed outside the feed pipe. The sampling unit includes a sampling mechanism and a collection mechanism. The sampling mechanism includes a filter box installed inside the housing, a filter screen installed inside the filter box, and a piston cylinder fixed to one side of the outer wall of the filter box. The mesh count of the filter screen is larger than that of the interception net. The other end of the feed pipe passes through the filter box and extends to the inside of the filter screen. The filter box has a connection port communicating with the piston cylinder on the side near the piston cylinder. A piston plate is installed inside the piston cylinder, and an air supply pipe is installed on the side of the piston cylinder away from the filter box. A drive shaft is rotatably connected inside the filter screen and coaxially arranged therewith. A sweeping frame for cleaning the inner wall of the filter screen is installed outside the drive shaft. One end of the drive shaft extends to the outside of the filter screen near the piston cylinder and is connected to the piston plate through a transmission assembly. The transmission assembly includes a connecting rod hinged to the outer wall of the piston plate near the connection port and a transmission rack hinged to the other end of the connecting rod. The transmission rack meshes with a transmission gear installed on the drive shaft. The partition is equipped with a cleaning assembly for scraping off impurities from the surface of the interception net. The cleaning assembly includes a linkage rod rotatably connected to the partition and a scraper fixed to one end of the linkage rod. The scraper is located on the outside of the partition near the baffle and abuts against the surface of the interception net. The length of the scraper is greater than the diameter of the interception net. The other end of the drive shaft extends to the outside of the filter box and is connected to the linkage rod for transmission. The collection mechanism includes a conveying pipe fixed on the filter box, an outlet pipe fixed on the inlet pipe, and multiple collection tanks installed between the conveying pipe and the inlet pipe. A one-way valve is installed on the outlet pipe. Fixed pipes are installed at both ends of the collection tanks. Multiple connecting pipes for installing the fixed pipes are installed on the outer wall of the side opposite to the inlet pipe, and solenoid valves are installed on the connecting pipes.

2. The measurement while drilling system according to claim 1, characterized in that, The filter screen is cylindrical, the drive shaft is coaxial with the filter screen, the sweeping frame is rectangular, and the outer walls of the two long sides of the sweeping frame abut against the inner walls of the two ends of the filter screen, and the outer wall of the wide side of the sweeping frame abuts against the side wall of the filter screen.

3. The measurement while drilling system according to claim 1, characterized in that, The drive assembly includes electric telescopic rods installed on the outer walls of both sides of the feed pipe and two connecting rods respectively fixed to one end of the output shaft of the two electric telescopic rods. The other end of the two connecting rods passes through the partition and is fixed to the baffle. A battery and a microcontroller are installed inside the housing. The input ends of the solenoid valve and the electric telescopic rod are electrically connected to the output end of the microcontroller.

4. The measurement while drilling system according to claim 1, characterized in that, The transmission rack is movably fitted with a fixed sleeve, which is fixed to the outer wall of the filter screen.

5. The measurement while drilling system according to claim 1, characterized in that, A gate valve is installed on the fixed pipe, and the connecting pipe is connected to the fixed pipe through a water pipe joint.

6. The measurement while drilling system according to claim 1, characterized in that, The diameter of the connection port is the same as the inner diameter of the piston cylinder. A limit block is fixed on the inner wall of the piston cylinder near the connection port, and a sealing ring is installed on the outer ring of the piston plate.

7. The measurement while drilling system according to claim 1, characterized in that, An operating port is provided on the outer wall of the housing, and a detachable sealing cover is installed inside the operating port.

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