A screening device for cuttings logging

Abstract

The present invention provides a screening device for rock cuttings logging. It comprises a buffer tank, a support assembly, a drive assembly, and a filter assembly. A spray pipe is provided within the filter assembly. This device can separate solids from liquids in drilling fluid and clean rock cuttings. The device can also be used in other fields.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas exploration, and in particular to a screening device for cuttings logging. Background Art

[0002] During oil and gas exploration, vibrating screens separate the drilling fluid containing cuttings from the wellhead. The separated cuttings are then repeatedly cleaned by logging personnel and stored in a centralized location.

[0003] Automatic rock cuttings washers have been proposed in the prior art. Using an automatic rock cuttings washer allows for mechanical cleaning instead of manual operation, effectively improving work efficiency. The general workflow of an automatic rock cuttings washer involves first passing drilling fluid through an overhead tank, then draining the drilling fluid into a buffer tank, and finally, charging the drilling fluid in the buffer tank into a vibrating screen.

[0004] However, in the prior art, the cleaning effect of the automatic cuttings washing machine is poor. Even if the cuttings are separated from the drilling fluid, they still contain many impurities, which brings difficulties to the subsequent logging work.

[0005] Therefore, the art hopes to provide a screening device for cuttings logging that can solve the above-mentioned problems, thereby improving the filtering and cleaning process of cuttings to the greatest extent. Summary of the Invention

[0006] The present invention aims to provide a screening device for cuttings logging. This device utilizes a support assembly to mount a drive assembly and a filter assembly on a buffer tank. The synergistic effect of the drive and filter assemblies not only separates cuttings from drilling fluid but also cleans the separated cuttings, thereby fundamentally improving cuttings filtration and cleaning. Furthermore, this device can also be applied to other fields.

[0007] According to the present invention, a screening device for cuttings logging is provided, comprising: a buffer tank for containing drilling fluid, a support assembly arranged above the buffer tank, a drive assembly fixedly connected to the support assembly, and a filter assembly installed on the drive assembly, wherein a spray pipe for cleaning cuttings is provided in the filter assembly, wherein drilling fluid is transported from the buffer tank to the filter assembly, and the drive assembly drives the filter assembly to vibrate, so that cuttings in the drilling fluid are separated.

[0008] In one embodiment, the filter assembly comprises a screen trough, and the screen trough is constructed as a closed enclosure comprising an arc edge and a straight edge, wherein an upwardly erected baffle is provided on the arc edge.

[0009] In one embodiment, the filter assembly further comprises a screen, wherein the screen is installed in the screen slot, and at least one latch is provided on the straight edge of the screen slot, and the latch securely connects the screen and the screen slot.

[0010] In one embodiment, the filter assembly further includes a water washing tank, which is located above the screen and fixedly connected to the screen tank.

[0011] In one embodiment, the spray pipe is installed in the water washing tank in an arc shape, and the spray pipe is provided with a plurality of spray holes arranged toward the screen.

[0012] In one embodiment, the driving assembly includes a vibration plate mounted on the supporting assembly, and a supporting bracket mounted above the vibration plate, wherein the screen groove is fixed on the vibration plate, and a vibration motor is provided on the supporting bracket, and the vibration plate is mounted on the supporting assembly through a plurality of vibration springs.

[0013] In one embodiment, the support assembly includes a support platform and a liquid storage tank disposed inside the support platform, wherein the drilling fluid from which the cuttings have been filtered out is returned to the buffer tank through the liquid storage tank.

[0014] In one embodiment, a fixing clamp is provided between the support platform and the buffer tank, and the fixing clamp is movable on the top wall of the buffer tank to adjust the position of the support platform.

[0015] In one embodiment, the buffer tank further includes a sand receiving pipe arranged on the top surface of the buffer tank and a sand receiving bucket arranged on the side of the buffer tank, the sand receiving pipe is used to receive rock cuttings separated from the drilling fluid from the filter assembly, and includes a first connection portion close to the sand receiving bucket and a second connection portion away from the sand receiving bucket, wherein the height of the first connection portion is lower than the height of the second connection portion.

[0016] In one embodiment, the filter assembly is inclined toward one side of the sand receiving pipe, and one end of the screen is located above the sand receiving pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in detail below with reference to the accompanying drawings, in which:

[0018] Figure 1 A schematic perspective view of a screening device for cuttings logging according to the present invention is shown;

[0019] Figure 2 A schematic perspective view showing a screen slot in a screening device for cuttings logging according to the present invention;

[0020] Figure 3 A schematic perspective view showing a screen in a screening device for cuttings logging according to the present invention;

[0021] Figure 4 A schematic perspective view of a water washing tank in a screening device for cuttings logging according to the present invention is shown;

[0022] Figure 5 A partial schematic diagram of a spray pipe in a screening device for cuttings logging according to the present invention is shown, specifically showing the spray direction of the spray holes on the spray pipe;

[0023] Figure 6 A schematic perspective view showing a liquid outlet pipe in a screening device for cuttings logging according to the present invention;

[0024] Figure 7 A schematic perspective view of a sand receiving bucket in a screening device for cuttings logging according to the present invention is shown.

[0025] In the drawings, like reference numerals are used for like parts, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 FIG. 1 shows a schematic perspective view of a screening device for cuttings logging according to the present invention. Figure 1 As shown, the screening device 100 for cuttings logging according to the present invention includes a buffer tank 10 for containing drilling fluid, a support assembly 40 arranged above the buffer tank 10, a drive assembly 30 fixedly connected to the support assembly 40, and a filter assembly 20 installed on the drive assembly 30.

[0028] The buffer tank 10 is a container for containing drilling fluid. Figure 1 As shown, the buffer tank 10 is formed as a cubic container, but it is understood that the buffer tank 10 can also be formed into other shapes, such as a cylinder, etc. Figure 1 As shown, the buffer tank 10 includes a side wall (eg Figure 1 The buffer tank 10 further includes a liquid inlet 15 on the right side wall 104 of the buffer tank 10. The liquid inlet 15 connects to an external hose (not shown) for transporting drilling fluid, guiding the drilling fluid in the hose (not shown) into the buffer tank 10. Furthermore, the buffer tank 10 further includes a pumping port 14 provided on the right side wall 104 of the buffer tank 10. The pumping port 14 is connected to the liquid inlet pipe 60 and is used to transport the drilling fluid in the buffer tank 10 to the filter assembly 20.

[0029] In one embodiment of the present invention, Figure 1As shown, the buffer tank 10 further includes another side wall (i.e. Figure 1 The overflow port 13 on the left side wall 103 of the buffer tank 10 is used to limit the liquid level within the buffer tank 10. Specifically, when the liquid level within the buffer tank 10 exceeds the overflow port 13, the overflow port 13 will drain excess liquid until the liquid level falls below the overflow port 13. This effectively prevents the buffer tank 10 from overflowing from the top surface 101 due to excessive liquid within the tank.

[0030] According to the present invention, the pumping port 14 is arranged above the liquid inlet 15 , and the overflow port 13 is arranged above the pumping port 14 and close to the top of the buffer tank 10 .

[0031] In one embodiment of the present invention, Figure 1 As shown, a fixing clamp 50 is provided between the buffer tank 10 and the support assembly 40. The fixing clamp 50 can move laterally on the top wall (the top wall can be understood as the top surface) of the buffer tank 10, thereby driving the support assembly 40 to move laterally and then adjust the position of the support assembly 40.

[0032] like Figure 1 As shown, the support assembly 40 includes a support platform 41 and a liquid storage tank 42 disposed within the support platform 41. The support platform 41 is slidably connected to the buffer tank 10 via a fixing clamp 50, allowing the support platform 41 to move laterally to change its operating position. The liquid storage tank 42 can recover drilling fluid that has been filtered from the filter assembly 20 and freed of cuttings.

[0033] In the present invention, Figure 1 As shown, the top of the support platform 41 is open and connected to the liquid storage tank 42 to form a hollow cavity for receiving the drilling fluid, which has been filtered and removed from the rock debris, produced by the filter assembly 20. The support platform 41 includes a vibration plate 411 disposed on the top and extending inward. The upper surface of the vibration plate 411 is fixedly connected to the drive assembly 30 via a vibration transmission spring 33, thereby providing support for the drive assembly 30 and the filter assembly 20 mounted thereon.

[0034] In the present invention, Figure 1 As shown, the liquid storage box 42 is constructed as an inner cavity of the support platform 41. The liquid storage box 42 includes a liquid outlet pipe 43 located at the bottom of the liquid storage box 42 and leading to the buffer tank 10.

[0035] Figure 6 FIG1 shows a schematic perspective view of a liquid outlet pipe in a screening device for cuttings logging according to the present invention. Figure 1 and Figure 6As shown, the liquid outlet pipe 43 is configured in a funnel shape, wherein the end with a larger cross-sectional area of ​​the liquid outlet pipe 43 is connected to the bottom of the liquid storage box 42, and the end with a smaller cross-sectional area of ​​the liquid outlet pipe 43 extends into the buffer tank 10. Therefore, the drilling fluid filtered by the filter assembly 20, from which the rock cuttings have been removed, returns to the buffer tank 10 through the liquid storage box 42 and the liquid outlet pipe 43.

[0036] like Figure 1 As shown, the drive assembly 30 includes a vibration plate 31 mounted on the support assembly 40, and a support bracket 32 ​​mounted above the vibration plate 31. Specifically, the vibration plate 31 is mounted on the upper surface of the vibration plate 411 via a vibration spring 33, and the filter assembly 20 is fixedly connected to the vibration plate 31.

[0037] In a specific embodiment of the present invention, Figure 1 As shown, the vibration plate 31 is made of four steel plates joined together. Furthermore, a cavity is formed in the center of the vibration plate 31, allowing the drilling fluid, free of rock debris, produced by the filter assembly 20 to flow through the vibration plate 31 into the liquid storage tank 42 and then return to the buffer tank 10 through the liquid outlet pipe 43.

[0038] In a specific embodiment of the present invention, Figure 1 As shown, the support bracket 32 ​​is constructed from three steel plates joined together to form a U-shaped structure. Furthermore, a vibration motor 321 is mounted on the top of the support bracket 32, while both bottom portions of the support bracket 32 ​​are fixedly connected to the vibration transmission plate 31. The vibration of the vibration motor 321 vibrates the filter assembly 20, effectively increasing the solid-liquid separation rate of the drilling fluid containing cuttings.

[0039] like Figure 1 As shown, the filter assembly 20 includes a screen slot 21, a screen 23 installed on the screen slot 21, and a water washing tank 24 located above the screen 23. The water washing tank 24 is fixedly connected to the screen slot 21.

[0040] Figure 2 FIG1 shows a schematic perspective view of a screen slot in a screening device for cuttings logging according to the present invention. Figure 1 and Figure 2 As shown, the screen trough 21 is constructed as a closed frame 22 comprising an arcuate edge 221 and a straight edge 222. Furthermore, the front and rear ends of the closed frame 22 are fixed to the vibration transmission plate 31. The arcuate edge 221 is provided with an upwardly erected baffle 223, which limits the range of movement of the screen 23 and the washing trough 24. The straight edge 222 is provided with at least one latch 224, which locks the screen 23 to the screen trough 21, thereby achieving a fixed connection between the screen 23 and the screen trough 21.

[0041] Figure 3A schematic perspective view of a screen in a screening device for cuttings logging according to the present invention is shown. Figure 1 and Figure 3 As shown, the screen 23 is a closed structure with a filter screen inside for filtering drilling fluid containing cuttings and achieving solid-liquid separation. A push-pull block 231 is provided at one end of the screen 23 for pulling the screen 23 from the screen slot 21 when replacing the filter screen.

[0042] Figure 4 FIG1 shows a schematic perspective view of a water washing tank in a screening device for cuttings logging according to the present invention. Figure 4 As shown, the water washing tank 24 includes a spray pipe 25 arranged inside the water washing tank 24, and a plurality of spray holes 251 are provided on the spray pipe 25.

[0043] Figure 5 The diagram shows a partial schematic diagram of the spray pipe in the screening device for cuttings logging according to the present invention, specifically showing the spray direction of the spray holes on the spray pipe. Figure 5 As can be seen in the figure, each nozzle hole 251 sprays downwards. As mentioned above, a screen 23 is provided below the screen slot 21. Therefore, in a specific embodiment not shown, the direction of each nozzle hole 251 spraying is all towards the screen 23.

[0044] In a specific embodiment of the present invention, Figure 1 As shown, the water washing tank 24 is arranged above the screen 23 and is fixedly connected to the screen tank 21, thereby effectively limiting the position of the screen 23 between the screen tank 21 and the water washing tank 24.

[0045] like Figure 4 As shown, the spray pipe 25 is arranged in a zigzag pattern within the screen slot 21 and sequentially connects to the curved edges on both sides of the screen slot 21. A water inlet 252 is provided at the end of the spray pipe 25. External purified water is introduced into the spray pipe 25 through the water inlet 252. The spray holes 251 provided on the spray pipe 25 thoroughly clean the filtered rock chips held on the screen 23, thereby ensuring that the surface of the rock chips collected by the sand receiving pipe 11 and into the sand receiving bucket 12 is clean.

[0046] In one embodiment of the present invention, Figure 1As shown, the buffer tank 10 includes a sand receiving pipe 11 mounted on the top surface 101 of the buffer tank 10 and a sand receiving bucket 12 mounted on the front surface 102 of the buffer tank 10. The sand receiving pipe 11 is configured as an arc-shaped structure and embedded within the buffer tank 10. The sand receiving pipe 11 includes a first connecting portion 111 with a lower height and a second connecting portion 112 with a higher height. The first connecting portion 111 is located near the sand receiving bucket 12, and rock cuttings roll from the second connecting portion 112 to the first connecting portion 111, where they are collected by the first connecting portion 11 into the sand receiving bucket 12.

[0047] Figure 7 A schematic perspective view of a sand receiving bucket in a screening device for cuttings logging according to the present invention is shown. In one embodiment of the present invention, Figure 7 As shown, the sand receiving bucket 12 includes a receiving end 121 disposed at the top of the sand receiving bucket 12 and a blocking end 122 disposed at the bottom of the sand receiving bucket 12. The receiving end 121 is open, while the blocking end 122 is closed. Furthermore, the cross-sectional area of ​​the receiving end 121 is larger than that of the blocking end 122. Therefore, the sand receiving bucket 12 can effectively collect rock cuttings collected from the first connecting portion 111. Furthermore, the sand receiving bucket 12 includes a hanging lug 123 disposed on its outer surface for carrying the sand receiving bucket 12 after removal.

[0048] In one embodiment of the present invention, the filter assembly 20 is tilted toward one side of the sand receiving pipe 11. Specifically, one end of the screen 23 is located above the sand receiving pipe 11 and tilted downward. Therefore, rock debris washed on the screen 23 slides directly into the sand receiving pipe 11 along the tilt of the screen 23.

[0049] In one embodiment of the present invention, Figure 1 As shown, the buffer tank 10 further includes a sand cleaning port 16 provided on the left side wall 103 of the buffer tank 10. The sand cleaning port 16 is located below the overflow port 13 and serves as a drainage outlet when flushing the tank body to discharge waste liquid.

[0050] In one embodiment of the present invention, Figure 1 As shown, the bottom of the buffer tank 10 is provided with running wheels 17, and there are four running wheels 17, which are all installed at the four corners of the bottom of the buffer tank 10. The running wheels 17 can be locked to limit the movement range of the buffer tank 10.

[0051] In the present invention, Figure 1As shown, the screening device 100 for rock cuttings logging is connected to a hose (not shown) via a liquid inlet 15, and the drilling fluid containing rock cuttings is transported from the hose (not shown) to the buffer tank 10. The drilling fluid containing rock cuttings is then transferred to the filter assembly 20 via the pumping port 14 and the liquid inlet pipe 60 (this connection is not shown in the figure). Afterwards, the filter assembly 20 is combined with the drive assembly 30 to achieve solid-liquid separation of the drilling fluid containing rock cuttings. At the same time, the spray pipe 25 cleans the surface of the rock cuttings by spraying water. In this way, the rock cuttings separated from the drilling fluid and cleaned by the spray pipe are collected into the sand receiving bucket 12 via the sand receiving pipe 11, and the drilling fluid from which the rock cuttings have been filtered is returned to the buffer tank 10 via the liquid storage box 42 and the liquid outlet pipe 43.

[0052] In an unillustrated embodiment of the present invention, drilling fluid containing cuttings can be directly delivered to the filter assembly 20 via the inlet pipe 60. The filter assembly 20 then combines with the drive assembly 30 to achieve solid-liquid separation of the drilling fluid containing cuttings. Simultaneously, the spray pipe 25 cleans the surface of the cuttings by spraying water. Thus, the cuttings separated from the drilling fluid and cleaned by the spray pipe are collected into the sand receiving bucket 12 via the sand receiving pipe 11. The drilling fluid, free of cuttings, flows through the liquid storage tank 42 and the outlet pipe 43 and is stored in the buffer tank 10.

[0053] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art may easily make changes or modifications within the scope of the present invention, and such changes or modifications should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A screening device (100) for cuttings logging, comprising: a buffer tank (10) for containing drilling fluid, A support assembly (40) is provided above the buffer tank (10), a drive assembly (30) fixedly connected to the support assembly (40), and A filter assembly (20) is mounted on the drive assembly (30), wherein a spray pipe (25) for cleaning rock debris is provided in the filter assembly (20). The drilling fluid is transported from the buffer tank (10) to the filter assembly (20), and the drive assembly (30) drives the filter assembly (20) to vibrate, so that rock cuttings in the drilling fluid are separated; The filter assembly (20) comprises a screen slot (21), wherein the screen slot (21) is configured as a closed enclosure (22) comprising an arc edge (221) and a straight edge (222), wherein an upwardly erected baffle (223) is provided on the arc edge (221); The filter assembly (20) further comprises a screen (23), wherein the screen (23) is installed in the screen slot (21), and at least one latch (224) is provided on the straight edge (222) in the screen slot (21), wherein the latch (224) securely connects the screen (23) and the screen slot (21); The filter assembly (20) further includes a water washing tank (24), wherein the water washing tank (24) is located above the screen (23) and is fixedly connected to the screen tank (21); The spray pipe (25) is installed in an arc shape inside the water washing tank (24), and the spray pipe (25) is provided with a plurality of spray holes (251) arranged toward the screen (23); The spray pipes (25) are distributed in a broken line shape in the screen slot (21) and are sequentially connected to the arcuate edges on both sides of the screen slot (21).

2. The screening device for cuttings logging according to claim 1, characterized in that: The driving assembly (30) includes a vibration plate (31) mounted on the supporting assembly (40), and a support frame (32) mounted above the vibration plate (31), wherein the screen slot (21) is fixed on the vibration plate (31), and a vibration motor (321) is provided on the support frame (32), and the vibration plate (31) is mounted on the supporting assembly (40) via a plurality of vibration springs (33).

3. The screening device for cuttings logging according to claim 1, characterized in that: The support assembly (40) includes a support platform (41) and a liquid storage tank (42) arranged inside the support platform (41), wherein the drilling fluid from which the rock cuttings are filtered out is returned to the buffer tank through the liquid storage tank (42).

4. The screening device for cuttings logging according to claim 3, characterized in that: A fixing clamp (50) is provided between the support platform (41) and the buffer tank (10), and the fixing clamp (50) is movable on the top wall of the buffer tank (10) to adjust the position of the support platform (41).

5. The screening device for cuttings logging according to claim 1, characterized in that: The buffer tank (10) further comprises a sand receiving pipe (11) arranged on the top surface of the buffer tank (10) and a sand receiving bucket (12) arranged on the side of the buffer tank (10), wherein the sand receiving pipe (11) is used to receive rock cuttings separated from the drilling fluid by the filter assembly (20), and comprises a first connecting portion (111) close to the sand receiving bucket (12) and a second connecting portion (112) away from the sand receiving bucket (12), wherein the height of the first connecting portion (111) is lower than the height of the second connecting portion (112).

6. The screening device for cuttings logging according to claim 5, characterized in that: The filter assembly (20) is inclined toward one side of the sand receiving pipe (11), and one end of the screen (23) is located above the sand receiving pipe (11).

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