A geological logging sand bailing device and sand bailing method based on vacuum filtration

Abstract

The present invention relates to a geological logging sand bailing device and sand bailing method based on vacuum filtration, belonging to the field of oil drilling geological logging technology. The buffer tank is connected to the ultrasonic oscillation quantitative tank through a slurry pump; the lower part of the ultrasonic oscillation quantitative tank is connected to the cyclone cleaning tank, the cyclone cleaning tank is connected to the vacuum screening rock cuttings collection tank, and the vacuum pump is connected to the vacuum screening rock cuttings collection tank through the vacuum tank. The sand bailing device can continuously collect part of the drilling fluid returned from the wellbore, and can obtain logging rock cuttings at the specified logging interval, solving the problem that the existing manual logging sand bailing method is not only time-consuming and labor-intensive; and the existing sand bailing device takes a long time to clean the rock cuttings, consumes a large amount of water, and the sand bailing process is open operation, and the volatile substances in the drilling fluid are harmful to the health of the operator. It is particularly suitable for oil field logging sand bailing.

Description

Technical Field

[0001] The invention relates to a geological logging sand bailing device and a sand bailing method based on vacuum filtration, belonging to the field of geological logging technology for oil drilling. Background Art

[0002] Cuttings logging is an important part of geological logging. It can continuously collect, clean and sort cuttings from the drilling fluid returned from the wellbore according to a certain logging interval and delay time, grasp the stratigraphic sequence and lithology of the underground strata, and preliminarily understand the oil, water and gas content of the strata. However, during the current drilling process, cuttings may be stripped off the wall of the drilled open hole wellbore, and return to the ground with the drilling fluid, mixed with the cuttings from the bottom of the well. However, the cuttings required for logging are the cuttings generated by the drill bit breaking the bottom of the well. Therefore, sorting out the "real" cuttings at the bottom of the well from the drilling fluid is one of the difficulties of the known cuttings logging sand bailing devices. On the other hand, traditional cuttings logging sand bailing mostly adopts manual methods, that is, the drilling fluid returned from the wellbore is separated into solid and liquid by the vibrating screen of the drilling rig solid control system, and the separated solid phase is regarded as cuttings. These solid phases are manually obtained and poured into a water basin, and manually stirred, cleaned or washed until the original color of the cuttings can be seen. However, the manual sand bailing method is difficult to meet the logging spacing requirements and distinguish between "real and false" cuttings, and it is also difficult to establish an accurate downhole stratigraphic sequence; and because water needs to be added to clean the cuttings, the cleaned cuttings need to be dried or dried again; the process of collecting, cleaning, and drying the cuttings is not only time-consuming, but also labor-intensive. To solve this problem, some oil fields have developed continuous sand bailing devices. The device uses a special vibrating screen to collect the solid phase and a mixing tank to clean the cuttings. There are many operating procedures, long sand bailing time, and high water consumption; the sand sample needs to be dried or dried; all processes are open operations, and the volatile substances in the drilling fluid are also harmful to the health of the operator, and the "real and false" cuttings are mixed, which increases the difficulty of identifying the cuttings. Therefore, providing a set of sand bailing devices with continuous collection, automatic cleaning and sorting of cuttings is the basic guarantee for continuous acquisition of sand samples in cuttings logging. Summary of the invention

[0003] The purpose of the present invention is to provide a geological logging sand bailing device and sand bailing method based on vacuum filtration, which can continuously collect rock cuttings, clean rock cuttings, separate and screen rock cuttings from drilling fluid returned from a wellbore according to a certain logging interval, so as to timely provide qualified rock cuttings for rock cutting logging, and the whole operation process is closed and no human intervention is required, so as to solve the problems that the existing manual method is not only time-consuming and labor-intensive; the cleaning time of rock cuttings by sand bailing device is long and the water consumption is large, and the sand bailing process is open operation, and the volatile substances in the drilling fluid are also harmful to the health of the operator.

[0004] The technical solution of the present invention is:

[0005] A geological logging sand bailing device based on vacuum filtration, which consists of a buffer tank, an ultrasonic oscillation quantitative tank, a cyclone cleaning tank, a vacuum screening rock cuttings collection tank, a vacuum pump and a vacuum tank, and is characterized in that: part of the drilling fluid is diverted from the drilling fluid return tank into the buffer tank, and the buffer tank is connected to the ultrasonic oscillation quantitative tank through a slurry pump; the lower part of the ultrasonic oscillation quantitative tank is connected to the cyclone cleaning tank, the cyclone cleaning tank is connected to the vacuum screening rock cuttings collection tank, and the vacuum pump is connected to the vacuum screening rock cuttings collection tank through the vacuum tank; when working, under the action of the vacuum pump, a vacuum is formed in the vacuum tank, the vacuum screening rock cuttings collection tank and the cyclone cleaning tank to facilitate the entry and discharge of fluids.

[0006] A stirring motor is arranged on the top of the tank body of the buffer tank, a stirring paddle is arranged in the tank body of the buffer tank, and the stirring motor is connected to the stirring paddle.

[0007] The ultrasonic oscillation quantitative tank is composed of an oscillation quantitative tank body, an ultrasonic generator, and a vibrating rod. The top of the oscillation quantitative tank body is equipped with an ultrasonic generator, the vibrating rod is arranged in the oscillation quantitative tank body, the ultrasonic generator is connected to the vibrating rod, the upper end of the oscillation quantitative tank body is provided with a liquid flow inlet, and the bottom of the oscillation quantitative tank body is provided with a liquid flow outlet.

[0008] The cyclone cleaning tank is composed of a tank body, a guide pipe, an air inlet pipe and an outlet pipe. The tank body is provided with a guide pipe, the top of which extends to the top of the tank body, the air inlet pipes are symmetrically arranged on both sides of the circumference of the upper end of the tank body, and the bottom of the tank body is provided with an outlet pipe.

[0009] The top of the guide pipe extending to the top of the tank body is provided with a flange; the air inlet pipe is arranged horizontally, the air inlet pipe is connected with the tank body, the air inlet pipe end connected with the tank body is rectangular, and the rectangular air inlet pipe end is tangent to the inner wall of the tank body.

[0010] The flow guide pipe is a variable diameter body, and the large diameter section of the flow guide pipe is evenly distributed with liquid flow holes on the wall of the pipe, and the small diameter section of the flow guide pipe is a blind pipe.

[0011] The vacuum screening rock cuttings collection tank is composed of an upper tank body, a middle tank body and a lower tank body. The upper tank body and the middle tank body are cylindrical tank bodies, and the lower tank body is a conical tank body. The upper tank body, the middle tank body and the lower tank body are connected and fixed to each other by fastening bolts. An upper sieve plate is installed between the upper tank body and the middle tank body, and a lower sieve plate is installed between the middle tank body and the lower tank body. An upper connecting pipe is provided on the top of the upper tank body, and the upper connecting pipe is connected to the outlet pipe of the cyclone cleaning tank. A lower connecting pipe is provided at the bottom of the lower tank body, and the lower connecting pipe is connected to the vacuum tank.

[0012] The upper sieve plate is a 20-40 mesh large-aperture sieve plate, which intercepts the medium-coarse solid particles of the drilling fluid well wall collapse and exfoliation, and the finer particles and gas and liquid pass through the upper sieve plate into the middle tank body. There is a sealing gasket between the upper sieve plate and the bottom of the upper tank body, and there is a sealing gasket between the upper sieve plate and the top of the middle tank body.

[0013] The lower sieve plate is a 150-200 mesh small aperture sieve plate, which intercepts the drill cuttings in the drilling fluid, and finer particles and gas and liquid pass through the lower sieve plate into the lower tank body. There is a sealing gasket between the lower sieve plate and the bottom of the middle tank body, and there is a sealing gasket between the lower sieve plate and the top of the lower tank body.

[0014] The sealing gasket is an annular rubber sealing gasket.

[0015] The sand bailing method of the sand bailing device comprises the following steps:

[0016] 1) The drilling fluid diverted from the drilling fluid return tank has a flow rate of 0.5m 3 / h-1.0m 3 / h into the buffer tank, start the stirring paddle to stir the entering drilling fluid to prevent the drilling fluid from settling, the stirring speed is 60-90r / min; while the stirring paddle is stirring, start the slurry pump to lift the drilling fluid in the buffer tank into the ultrasonic oscillation quantitative tank,

[0017] 2) The drilling fluid entering the ultrasonic oscillation quantitative tank is continuously oscillated to break the gel and clean the cuttings in the drilling fluid under the condition of ultrasonic power of 1kw;

[0018] 3) The drilling fluid that has been broken by ultrasonic vibration enters the guide tube under the action of gravity and flows out through the liquid flow hole into the cyclone cleaning tank. At the same time, under the action of vacuum, the air is 3 / h-150Nm 3 / h, the air enters the cyclone cleaning tank through the end of the air inlet pipe tangent to the inner wall of the tank, and forms a high-speed rotating flow. The high-speed rotating air is mixed and stirred with the drilling fluid flowing out of the liquid flow hole at a high speed, thereby forming a gas-liquid mixture;

[0019] 4) The gas-liquid mixture enters the vacuum screening cuttings collection tank under the action of vacuum. After the gas-liquid mixture is screened by the upper and lower screen plates in turn, the finer cuttings enter the lower tank. The particles, gas, and liquid that enter the lower tank are collected in the vacuum tank under the action of vacuum, thus completing the sand bailing operation. Among them, the solid phase particles screened by the upper screen plate are the well wall collapse and exfoliation particles (false cuttings), and the solid phase particles screened by the lower screen plate are the bottom well cuttings (target cuttings). After the bottom well cuttings are taken out, cuttings logging can be carried out.

[0020] The present invention has the following beneficial effects:

[0021] 1. Continuously collect part of the drilling fluid returned from the wellbore to obtain logging cuttings at the specified logging interval.

[0022] 2. The cleaning and collection of cuttings are completed in a closed process, without the need to add water or chemicals to clean the cuttings.

[0023] 3. Ultrasonic oscillation and cyclonic gas are used to flush the cuttings to ensure the flushing effect and integrity of the cuttings to the greatest extent. The upper and lower sieve plates of the vacuum screening cuttings collection tank are used to automatically sort the cuttings, reducing the difficulty of manually distinguishing the authenticity of the obtained cuttings.

[0024] 4. The entire sand dredging process is closed, does not add foreign matter, and does not cause pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic cross-sectional structural diagram of a buffer tank of the present invention;

[0027] Figure 3 It is a schematic cross-sectional view of the cyclone cleaning tank of the present invention;

[0028] Figure 4 It is a schematic diagram of the cross-sectional top view of the cyclone cleaning tank of the present invention;

[0029] Figure 5 It is a schematic cross-sectional view of the vacuum screening cuttings collection tank of the present invention;

[0030] Figure 6 It is a schematic cross-sectional view of the sonic oscillation quantitative tank of the present invention;

[0031] Figure 7 This is an analysis diagram when the outlet pressure of the cleaning tank of the present invention is 40 kPa;

[0032] Figure 8 This is an analysis diagram when the outlet pressure of the cleaning tank of the present invention is 80 kPa.

[0033] In the figure: 1. buffer tank, 2. ultrasonic oscillation quantitative tank, 3. cyclone cleaning tank, 4. vacuum screening cuttings collection tank, 5. vacuum tank, 6. stirring motor, 7. stirring paddle, 8. tank body, 9. guide pipe, 10. air inlet pipe, 11. outlet pipe, 12. flange, 13. liquid flow hole, 14. slurry pump, 15. upper tank body, 16. middle tank body, 17. lower tank body, 18. upper sieve plate, 19. lower sieve plate, 20. upper connecting pipe, 21. lower connecting pipe, 22. vacuum pump, 23. oscillation quantitative tank body, 24. vibrating rod, 25. ultrasonic generator, 26. liquid flow inlet, 27. liquid flow outlet. DETAILED DESCRIPTION

[0034] The vacuum filtration-based geological logging sand bailing device is composed of a buffer tank 1, an ultrasonic oscillation quantitative tank 2, a cyclone cleaning tank 3, a vacuum screening rock debris collection tank 4 and a vacuum tank 5. The buffer tank 1 is arranged on one side of the ultrasonic oscillation quantitative tank 2, a stirring motor 6 is arranged on the top of the tank body of the buffer tank 1, a stirring paddle 7 is arranged in the tank body of the buffer tank 1, and the stirring motor 6 is connected to the stirring paddle 7. A feed inlet is arranged on the tank body on one side of the stirring motor 6, and a discharge port is arranged at the bottom of the tank body of the buffer tank 1; the buffer tank 1 is connected to the ultrasonic oscillation quantitative tank 2 through a slurry pump 14 through the discharge port.

[0035] The ultrasonic oscillation quantitative tank 2 is composed of an oscillation quantitative tank body 23, a vibrating rod 24, and an ultrasonic generator 25. The ultrasonic generator 25 is installed on the top of the oscillation quantitative tank body 23, and a vibrating rod 24 is arranged inside the oscillation quantitative tank body 23. The ultrasonic generator 25 is connected to the vibrating rod 24. A liquid flow inlet 26 is arranged at the upper end of the oscillation quantitative tank body 23, and a liquid flow outlet 27 is arranged at the bottom of the oscillation quantitative tank body 23, which is connected to the cyclone cleaning tank 3.

[0036] A cyclone cleaning tank 3 is arranged below the ultrasonic oscillation quantitative tank 2. The cyclone cleaning tank 3 is composed of a tank body 8, a guide pipe 9, an air inlet pipe 10 and an outlet pipe 11. A guide pipe 9 is arranged inside the tank body 8, and the top of the guide pipe 9 extends to the top of the tank body 8. A flange 12 is arranged on the top of the guide pipe 9 extending to the top of the tank body 8. The guide pipe 9 is a variable diameter body, and liquid flow holes 13 are evenly distributed on the pipe wall of the guide pipe 9 of the large diameter section in the tank body 8, and the guide pipe 9 of the small diameter section is a blind pipe. An air inlet pipe 10 is arranged on both sides of the circumference of the upper end of the tank body 8, and the air inlet pipe 10 is connected to the atmosphere; the air inlet pipe 10 is arranged horizontally, and the air inlet pipe 10 is connected to the tank body 8. The end of the air inlet pipe 10 connected to the tank body is rectangular, and the end of the rectangular air inlet pipe 10 is tangent to the inner wall of the tank body, and an outlet pipe 11 is arranged at the bottom of the tank body 8. The cyclone cleaning tank 3 is connected to the ultrasonic oscillation quantitative tank 2 by the flange 12 on the top of the guide pipe 9. The purpose of setting the guide pipe 9 is, first, to allow the drilling fluid to enter, and second, to make the drilling fluid entering the tank body 8 hollow, so that under the action of the airflow entering from the air inlet pipe 10, the guide pipe 9 is rotated as the axis to achieve the purpose of cleaning the rock cuttings.

[0037] The cyclone cleaning tank 3 is connected to the vacuum screening rock cuttings collection tank 4, which is composed of an upper tank body 15, a middle tank body 16 and a lower tank body 17. The upper tank body 15 and the middle tank body 16 are cylindrical tank bodies, and the lower tank body 17 is a conical tank body. The upper tank body 15, the middle tank body 16 and the lower tank body 17 are connected and fixed to each other by fastening bolts. An upper sieve plate 18 is installed between the upper tank body 15 and the middle tank body 16. The upper sieve plate 18 is a 20-40 mesh large-aperture sieve plate, which is used to intercept coarse solid phase particles in the drilling fluid. A lower sieve plate 19 is installed between the middle tank body 16 and the lower tank body 17. The lower sieve plate 19 is a 150-200 mesh small-aperture sieve plate, which is used to intercept drill cuttings in the drilling fluid. Finer particles and gas and liquid pass through the lower sieve plate 19 into the lower tank body 17. There are sealing gaskets between the upper sieve plate 18 and the bottom of the upper tank body 15, between the upper sieve plate 18 and the top of the middle tank body 16, between the lower sieve plate 19 and the bottom of the middle tank body 16, and between the lower sieve plate 19 and the top of the lower tank body 17. The sealing gaskets are annular rubber sealing gaskets used to ensure the sealing between the middle tank body 16, the lower sieve plate 19, and the lower tank body 17. An upper connecting pipe 20 is provided at the top of the upper tank body 15, and the upper connecting pipe 20 is connected to the outlet pipe 11 of the cyclone cleaning tank 3. A lower connecting pipe 21 is provided at the bottom of the lower tank body 17, and the lower connecting pipe 21 is connected to the vacuum tank 5.

[0038] The vacuum screening rock cuttings collection tank 4 is connected to the vacuum tank 5; a vacuum pump 22 is provided on one side of the vacuum tank 5, and the vacuum pump 22 is connected to the vacuum tank 5. During operation, under the action of the vacuum pump 22, the vacuum tank 5, the vacuum screening rock cuttings collection tank 4, and the cyclone cleaning tank 3 form a vacuum (negative pressure) working state.

[0039] The sand bailing method of the sand bailing device is as follows:

[0040] The drilling fluid diverted from the drilling fluid return tank has a flow rate of 0.5m 3 / h-1.0m 3 / h, the drilling fluid enters the buffer tank 1, and the stirring motor 6 is started to drive the stirring paddle 7 to rotate, so as to stir the drilling fluid entering the buffer tank 1. The stirring speed of the stirring paddle 7 is 90r / min. The purpose of the stirring paddle 7 rotating at a low speed is, firstly, to stir the drilling fluid to prevent the drilling fluid from settling, and secondly, to reduce the impact speed of the stirring paddle 7 on the rock cuttings contained in the drilling fluid during the rotation process, so as to avoid the rock cuttings being broken and causing difficulty in subsequent sorting. While the stirring paddle 7 is stirring, the slurry pump 22 is started to lift the drilling fluid in the buffer tank 1 into the ultrasonic oscillation quantitative tank 3, and the drilling fluid is degelled under the condition of 1kw ultrasonic power to peel off the attachments on the rock cuttings; the drilling fluid degelled by ultrasonic oscillation enters the cyclone cleaning tank 3 through the liquid flow outlet 27, the guide pipe 9, and the liquid flow hole 13 under the action of gravity. In this process, since the end of the air inlet pipe 10 is tangent to the inner wall of the tank body, under the action of vacuum, the air entering the air inlet pipe 10 is at 120Nm 3 / h-150Nm 3 / h, a high-speed rotating flow is formed in the cyclone cleaning tank 3, and the high-speed rotating air is mixed with the drilling fluid flowing out of the liquid flow hole 13 and rotated and stirred at a high speed, thereby forming a gas-liquid mixture and achieving the purpose of cleaning the cuttings. The purpose of cleaning the drilling fluid through the cyclone cleaning tank 3 is, firstly, to use the airflow to drive the drilling fluid to rotate with the guide tube 9 as the axis. During the rotation process, due to the different densities of the liquid phase and the solid phase, a speed difference is formed, so as to use the speed difference between the liquid phase and the solid phase (relative friction between the liquid phase and the solid phase) to achieve the purpose of cleaning the dirt on the surface of the cuttings. Secondly, there is no mechanical moving part in the rotating cleaning tank, which can avoid the collision between the cuttings and the high-speed mechanical moving parts to cause the cuttings to break, and then cause the cuttings (large-size cuttings) generated by the peeling of the wellbore wall to mix with the cuttings (small-size cuttings) from the bottom of the well. Among them, the purpose of using a reducer in the flow guide pipe 9 is, firstly, to make the drilling fluid entering the tank body 8 hollow, and secondly, the annular space between the large diameter section of the flow guide pipe 9 and the inner wall of the tank body 8 is smaller than the annular space between the small diameter section of the flow guide pipe 9 and the inner wall of the tank body 8. The rotational flow intensity formed under the impetus of the air entering the air intake pipe 10 is greater, thereby driving the drilling fluid in the tank body 8 to rotate as a whole around the flow guide pipe 9 as the axis, and at the same time reducing the flow friction of the drilling fluid in the annular space between the small diameter section of the flow guide pipe 9 and the inner wall of the tank body 8, thereby ensuring the integrity of the cuttings to the greatest extent possible while the drilling fluid is cleaned by the cyclone cleaning tank 3.

[0041] The gas-liquid mixture after cleaning enters the vacuum screening rock cutting collection tank 4 through the outlet pipe 11 under the action of vacuum. Taking advantage of the fact that the particle size of the rock cuttings produced by the exfoliation of the wellbore wall is larger than the particle size of the rock cuttings from the bottom of the well, the gas-liquid mixture entering the vacuum screening rock cutting collection tank 4 first screens the rock cuttings produced by the exfoliation of the wellbore wall through the 20-mesh upper screen plate 18, and the small-size rock cuttings from the bottom of the well enter the 150-mesh lower screen plate 19 through the upper screen plate 18 for screening, thereby realizing the sorting of rock cuttings, and the finer rock cuttings solid phase enters the lower tank body 17 with the gas and liquid phase. The finer rock cuttings solid phase entering the lower tank body 17 enters the vacuum tank 5 with the gas and liquid phase under the action of vacuum. Thus, the sand bailing operation is completed.

[0042] In order to verify the cleaning effect of the cyclone cleaning tank 3, the inventor conducted a flow simulation analysis of the gas-liquid two-phase flow in the cyclone cleaning tank 3, wherein:

[0043] The height of the tank body 8 of the cyclone cleaning tank 3 is 300 mm; the diameter of the tank body 8 is 120 mm;

[0044] The diameter of the liquid flow hole 13 is 3 mm;

[0045] The height of the large diameter section of the flow guide pipe 9 in the tank body 8 is 60 mm, and the diameter of the large diameter section is 80 mm;

[0046] The small diameter section of the flow guide pipe 9 in the tank body 8 has a height of 190 mm and a diameter of 32 mm;

[0047] Table 1. Working parameters of cyclone cleaning tank at different vacuum levels

[0048]

[0049] The tank body 8 of the cyclone cleaning tank 3 is 300 mm high; the data is extracted from 6 tank body cross sections at 50 mm intervals along the tank body height. The specific analysis results are as follows (see Appendix Figure 7 , 8 ):

[0050] Table 2. Liquid mixing effect in cyclone cleaning tank

[0051]

[0052] Table 1 shows that for a cyclone cleaning tank of a certain structure, the greater the vacuum degree, the greater the air flow rate and the liquid flow rate discharged from the guide pipe; Table 2 shows that the liquid phase volume fraction and the mixed density are basically stable along the height direction of the tank body; Figure 7 and Figure 8 The liquid volume distribution on each cross section is shown, indicating that the liquid phase is carried by the rotating airflow, and the liquid volume fraction increases near the tank wall. The results show that the liquid entering the cyclone cleaning tank rotates at a high speed under the action of gas flow, which is conducive to the cleaning of cuttings.

[0053] The sand bailing device can continuously collect part of the drilling fluid returned from the wellbore, can meet the specified logging interval to obtain logging cuttings, and complete the cleaning and collection of cuttings in a closed process, without the need to add water or chemicals to clean the cuttings. The sand bailing device automatically sorts the cuttings through the vacuum screening cuttings collection tank of the multi-stage screen, reducing the difficulty of manually distinguishing the true and false cuttings. Ultrasonic oscillation and cyclonic gas are used to flush the cuttings to ensure the cleanliness and integrity of the cuttings; the entire sand bailing process is closed, no foreign matter (water or chemicals) is added, and no pollution to the environment is generated. This solves the problems that the existing manual logging sand bailing is not only time-consuming and labor-intensive; and the existing continuous sand bailing device takes a long time to clean the cuttings, consumes a large amount of water, and the sand bailing process is open operation, and the volatile substances in the drilling fluid are harmful to the health of the operator. It is particularly suitable for oilfield logging sand bailing.

Claims

1. A geological logging sand bailing device based on vacuum filtration, comprising a buffer tank (1), an ultrasonic oscillation quantitative tank (2), a cyclone cleaning tank (3), a vacuum screening rock debris collection tank (4), a vacuum pump (22) and a vacuum tank (5), characterized in that: The buffer tank (1) is connected to the ultrasonic oscillation quantitative tank (2) via a slurry pump (14); a cyclone cleaning tank (3) is arranged below the ultrasonic oscillation quantitative tank (2); the ultrasonic oscillation quantitative tank (2) is connected to the vacuum screening rock cuttings collection tank (4) via the cyclone cleaning tank (3); the vacuum pump (22) is connected to the vacuum screening rock cuttings collection tank (4) via the vacuum tank (5); when in operation, vacuum is formed in the vacuum tank (5), the vacuum screening rock cuttings collection tank (4) and the cyclone cleaning tank (3) under the action of the vacuum pump (22), so as to facilitate the entry and discharge of fluid; The ultrasonic oscillation quantitative tank (2) is composed of an oscillation quantitative tank body (23), an ultrasonic generator (25), and a vibrating rod (24); the ultrasonic generator (25) is installed on the top of the oscillation quantitative tank body (23); the vibrating rod (24) is arranged inside the oscillation quantitative tank body (23); the ultrasonic generator (25) is connected to the vibrating rod (24); the upper end of the oscillation quantitative tank body (23) is provided with a liquid flow inlet (26); the bottom of the oscillation quantitative tank body (23) is provided with a liquid flow outlet (27) connected to the guide pipe (9) above the cyclone cleaning tank (3); The cyclone cleaning tank (3) is composed of a tank body (8), a flow guide pipe (9), an air inlet pipe (10) and an outlet pipe (11); the tank body (8) is provided with a flow guide pipe (9), the top end of the flow guide pipe (9) extends to the top of the tank body (8), the air inlet pipes (10) are respectively provided on both sides of the circumference of the upper end of the tank body (8), and the bottom end of the tank body (8) is provided with an outlet pipe (11); The bottom of the guide pipe (9) in the tank body (8) is in a blocked shape, and liquid flow holes (13) are evenly distributed on the circumference of the guide pipe (9); the guide pipe (9) is a variable diameter body, and the guide pipe (9) in the large diameter section in the tank body (8) is evenly distributed on the pipe wall with liquid flow holes (13), and the guide pipe (9) in the small diameter section is a blind pipe.

2. A vacuum filtration-based geological logging sand bailing device according to claim 1, characterized in that: A stirring motor (6) is arranged on the top of the tank body of the buffer tank (1), a stirring paddle (7) is arranged inside the tank body of the buffer tank (1), and the stirring motor (6) is connected to the stirring paddle (7).

3. A vacuum filtration-based geological logging sand bailing device according to claim 1, characterized in that: A flange (12) is provided at the top of the guide pipe (9) extending above the tank body (8); the air inlet pipe (10) is arranged horizontally, the air inlet pipe (10) is connected to the tank body (8), the end of the air inlet pipe (10) connected to the tank body (8) is rectangular, and the end of the rectangular air inlet pipe (10) is tangent to the inner wall of the tank body (8).

4. A vacuum filtration-based geological logging sand bailing device according to claim 1, characterized in that: The vacuum screening rock cuttings collection tank (4) is composed of an upper tank body (15), a middle tank body (16) and a lower tank body (17); the upper tank body (15) and the middle tank body (16) are cylindrical tank bodies, and the lower tank body (17) is a conical tank body; the upper tank body (15), the middle tank body (16) and the lower tank body (17) are connected and fixed to each other by fastening bolts; an upper sieve plate (18) is installed between the upper tank body (15) and the middle tank body (16), and a lower sieve plate (19) is installed between the middle tank body (16) and the lower tank body (17); an upper connecting pipe (20) is provided at the top of the upper tank body (15), and the upper connecting pipe (20) is connected to the outlet pipe (11) of the cyclone cleaning tank; and a lower connecting pipe (21) is provided at the bottom of the lower tank body (17), and the lower connecting pipe (21) is connected to the vacuum tank (5).

5. A vacuum filtration-based geological logging sand bailing device according to claim 4, characterized in that: The upper sieve plate (18) is a sieve plate with a large aperture of 20-40 meshes, so as to intercept coarse solid particles in the drilling fluid. A sealing gasket is provided between the upper sieve plate (18) and the bottom of the upper tank body (15), and a sealing gasket is provided between the upper sieve plate (18) and the top of the middle tank body (16).

6. A vacuum filtration-based geological logging sand bailing device according to claim 4, characterized in that: The lower sieve plate (19) is a sieve plate with a small aperture of 150-200 meshes, so as to intercept drill cuttings in the drilling fluid, and smaller particles and gas and liquid pass through the lower sieve plate (19) into the lower tank body (17); there are sealing gaskets between the lower sieve plate (19) and the bottom of the middle tank body (16), and between the lower sieve plate (19) and the top of the lower tank body (17).

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