A defoaming structure, a defoaming device and a defoaming equipment of a drilling fluid

Abstract

The application provides a defoaming structure, a defoaming device and a defoaming equipment of a drilling fluid, and relates to the technical field of oilfield drilling.The defoaming structure comprises a vertical riser and at least one first umbrella-shaped cone cylinder and at least one second umbrella-shaped cone cylinder sleeved outside the riser.The first umbrella-shaped cone cylinder has a collection surface extending upwardly and obliquely from the inner edge thereof.The inner edge of the first umbrella-shaped cone cylinder and the outer wall of the riser have a first annular interval.The outer edge of the first umbrella-shaped cone cylinder is uniformly provided with a plurality of first notches.The second umbrella-shaped cone cylinder has a diffusion surface extending downwardly and obliquely from the inner edge thereof.The inner edge of the second umbrella-shaped cone cylinder and the outer wall of the riser have a second annular interval.The outer edge of the second umbrella-shaped cone cylinder is uniformly provided with a plurality of second notches.The plurality of second notches and the plurality of first notches are arranged in a staggered manner.The width of the first annular interval is greater than the width of the second annular interval.The defoaming structure, the defoaming device and the defoaming equipment of the drilling fluid can effectively improve the defoaming efficiency of the drilling fluid.

Description

Technical Field

[0001] This invention relates to the field of oilfield drilling technology, and in particular to a defoaming structure, defoaming device, and defoaming equipment for drilling fluid. Background Technology

[0002] During oil drilling, it is necessary to understand the basic conditions of the downhole rock formations, which is generally achieved using gas logging technology. Gas logging technology monitors the presence of oil and gas in the drilled formations in real time by observing the gaseous substances carried by the drilling fluid returning to the surface. Defoaming devices, widely used gas logging equipment, remove dissolved and suspended gases from the drilling fluid, separating the gas from the drilling fluid, and then collecting samples from the drilling fluid returning to the surface.

[0003] Currently, conventional defoaming devices mainly include non-powered degassers, mechanical degassers, and semi-permeable membrane degassers. Non-powered degassers rely on the force of the drilling fluid returning to the surface to break down the degasser itself, and then remove the gas under negative pressure. Non-powered degassers have very low degassing efficiency and are greatly affected by external factors. Mechanical degassers, on the other hand, conventionally use mechanical agitation, heating, and negative pressure to remove gas from the drilling fluid. Mechanical degassers are mainly divided into electric agitator degassers and pneumatic degassers. Electric agitator degassers use electricity as power, reducing the impact of drilling fluid viscosity and flow rate on non-powered degassers, and significantly improving degassing efficiency, but they have poor adaptability, and degassing data is greatly affected by changes in the liquid level. Pneumatic degassers use compressed air as power, are safer, and are suitable for flammable and explosive areas. Semi-permeable membrane degassers utilize the selective permeability of a semi-permeable membrane and the concentration difference of hydrocarbons on both sides of the membrane to collect gas. However, they have low degassing efficiency and high cost.

[0004] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a defoaming structure, defoaming device and defoaming equipment for drilling fluid through repeated experiments, in order to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a defoaming structure, a defoaming device, and a defoaming equipment, which can effectively improve the defoaming efficiency of drilling fluid.

[0006] To achieve the above objectives, the present invention proposes a defoaming structure for drilling fluid, wherein the defoaming structure includes a vertically arranged riser and a sleeved portion thereof outside the riser.

[0007] At least one first umbrella-shaped cone, the first umbrella-shaped cone having a collection surface extending obliquely upward from its inner edge, the inner edge of the first umbrella-shaped cone having a first annular gap with the outer wall of the riser, and a plurality of first notches evenly distributed on the outer edge of the first umbrella-shaped cone;

[0008] At least one second umbrella-shaped cone, the second umbrella-shaped cone having a diffusion surface extending obliquely downward from its inner edge, the inner edge of the second umbrella-shaped cone having a second annular gap with the outer wall of the riser, and a plurality of second notches evenly distributed on the outer edge of the second umbrella-shaped cone;

[0009] The multiple second gaps and the multiple first gaps are staggered, and the width of the first annular interval is greater than the width of the second annular interval.

[0010] The present invention also proposes a defoaming device for drilling fluid, wherein the defoaming device for drilling fluid includes a defoaming tank and a vacuum pump. The defoaming tank is hollow inside and forms a receiving cavity. The defoaming structure of drilling fluid as described above is set in the receiving cavity. A liquid delivery pipe is connected to the bottom end of the riser. The liquid delivery pipe seals through the defoaming tank and extends to the outside of the defoaming tank. An air extraction hole communicating with the receiving cavity is opened on the outer wall of the defoaming tank. The vacuum pump is sealed to the outside of the air extraction hole. A liquid outlet is opened at the bottom of the defoaming tank.

[0011] The present invention also proposes a defoaming device for drilling fluid, wherein the defoaming device for drilling fluid includes a first diaphragm pump, a second diaphragm pump, a heating tank, a storage tank, and a defoaming device as described above. The first diaphragm pump is connected to a delivery pipe and pumps drilling fluid into the riser through the delivery pipe. The second diaphragm pump is connected to the outlet and inputs the defoamed drilling fluid into the heating tank. The storage tank is connected to the heating tank and stores the heated drilling fluid.

[0012] Compared with the prior art, the present invention has the following features and advantages:

[0013] The defoaming structure, defoaming device, and defoaming equipment proposed in this invention achieve continuous turbulence of drilling fluid and maximize the flow distance of drilling fluid within a limited space, thereby improving the efficiency of bubble elimination in drilling fluid. Furthermore, the entire defoaming process is highly efficient and stable, and is basically unaffected by the composition of drilling fluid and environmental conditions, maintaining stable defoaming performance under various working conditions. Attached Figure Description

[0014] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0015] Figure 1 This is a schematic diagram of the defoaming structure proposed in this invention;

[0016] Figure 2 This is a schematic diagram of the structure of the first umbrella-shaped cone in this invention;

[0017] Figure 3 This is a schematic diagram of the structure of the second umbrella-shaped cone in this invention;

[0018] Figure 4 This is a schematic diagram of the dispersion plate in this invention;

[0019] Figure 5 This is a schematic diagram of the defoaming tank in this invention;

[0020] Figure 6 This is an external view of the defoaming tank in this invention;

[0021] Figure 7 This is a schematic diagram of the defoaming device in this invention;

[0022] Figure 8 This is a schematic diagram of the storage tank in this invention.

[0023] Explanation of reference numerals in the attached figures

[0024] 100. Defoaming structure; 10. Riser;

[0025] 11. Liquid outlet; 20. First umbrella-shaped cone;

[0026] 21. Collect surface; 22. First notch;

[0027] 30. Second umbrella-shaped cone; 31. Diffusion surface;

[0028] 32. Second gap; 40. Dispersion plate;

[0029] 41. Dispersing surface; 42. Turbulent convex stripes;

[0030] 43. Flow orifice; 50. Infusion tubing;

[0031] 60. First float valve; 210. Defoamer tank;

[0032] 211. Receptacle; 212. Liquid outlet;

[0033] 220. Vacuum pump; 300. Defoaming equipment;

[0034] 310. First diaphragm pump; 320. Second diaphragm pump;

[0035] 330. Heating tank; 340. Storage tank;

[0036] 341. Second float valve; 350. Cooler. Detailed Implementation

[0037] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, and these should all be considered to fall within the scope of the invention.

[0038] like Figures 1 to 4 As shown, the present invention proposes a defoaming structure 100 for drilling fluid. The defoaming structure 100 includes a vertically arranged riser 10 and at least one first umbrella-shaped cone 20 and at least one second umbrella-shaped cone 30 sleeved outside the riser 10. The first umbrella-shaped cone 20 has a collection surface 21 extending obliquely upward from its inner edge. The inner edge of the first umbrella-shaped cone 20 has a first annular gap with the outer wall of the riser 10. The outer edge of the first umbrella-shaped cone 20 is evenly distributed with a plurality of first notches 22. The second umbrella-shaped cone 30 has a diffusion surface 31 extending obliquely downward from its inner edge. The inner edge of the second umbrella-shaped cone 30 has a second annular gap with the outer wall of the riser 10. The outer edge of the second umbrella-shaped cone 30 is evenly distributed with a plurality of second notches 32. The plurality of second notches 32 and the plurality of first notches 22 are staggered, and the width of the first annular gap is greater than the width of the second annular gap.

[0039] The drilling fluid defoaming structure 100 proposed in this invention guides the drilling fluid through the collection surface 21 of the first umbrella-shaped cone 20 and the diffusion surface 31 of the second umbrella-shaped cone 30. The drilling fluid flows from the outer edge of the first umbrella-shaped cone 20 through the collection surface 21 to the inner edge of the first umbrella-shaped cone 20, and then falls from the first annular gap at the inner edge of the first umbrella-shaped cone 20 to the inner edge of the second umbrella-shaped cone 30. The drilling fluid falling into the second umbrella-shaped cone 30 flows through the diffusion surface 31 to the outer edge of the second umbrella-shaped cone 30. This maximizes the flow distance of the drilling fluid within a limited space and correspondingly improves the defoaming efficiency of the drilling fluid in the effective space.

[0040] The drilling fluid defoaming structure 100 proposed in this invention allows the drilling fluid to flow downwards along the collection surface 21 to the inner edge of the first umbrella-shaped cone 20 during the defoaming process. It then falls through the first annular interval to the diffusion surface 31 of the second umbrella-shaped cone 30, and then flows downwards along the diffusion surface 31 to the outer edge of the second umbrella-shaped cone 30. Finally, it flows out downwards through the second notch 32 at the outer edge. The entire process is efficient and stable, and is basically unaffected by the composition of the drilling fluid and environmental conditions. It can maintain stable defoaming performance under various working conditions.

[0041] The drilling fluid defoaming structure 100 proposed in this invention has a first annular gap between the first umbrella-shaped cone 20 and the riser 10, and a second annular gap between the second umbrella-shaped cone 30 and the riser 10, so that the gas that escapes due to drilling fluid defoaming can flow upward through the first annular gap and the second annular gap, ensuring that the separated gas can be discharged smoothly.

[0042] In an optional embodiment of the present invention, a plurality of first umbrella-shaped cones 20 and a plurality of second umbrella-shaped cones 30 are provided outside the riser 10, and the plurality of first umbrella-shaped cones 20 and the plurality of second umbrella-shaped cones 30 are staggered along the length direction of the riser 10. With the above structure, the drilling fluid undergoes repeated collection and dispersion flows within a limited space through the staggered arrangement of the plurality of first umbrella-shaped cones 20 and the plurality of second umbrella-shaped cones 30, greatly improving the defoaming and degassing efficiency of the drilling fluid.

[0043] In this embodiment, the staggered arrangement of multiple first notches 22 and multiple second notches 32 ensures that the drilling fluid flowing out of the second notches 32 can fall onto the collection surface 21 of the first umbrella-shaped cone 20, achieving continuous flow of the drilling fluid. Simultaneously, the uniform distribution of the multiple second notches 32 along the circumference of the second umbrella-shaped cone 30 also ensures that the drilling fluid flowing out of the multiple second notches 32 is evenly distributed on the collection surface 21 of the first umbrella-shaped cone 20 below it, further improving the defoaming and degassing efficiency of the drilling fluid.

[0044] In an optional embodiment of the present invention, both the first umbrella-shaped cone 20 and the second umbrella-shaped cone 30 are in the shape of a conical tube.

[0045] In an optional embodiment of the present invention, the outer diameter of the first umbrella-shaped cone 20 and the outer diameter of the second umbrella-shaped cone 30 can be set to be the same, and the outer diameter of the first umbrella-shaped cone 20 can be set to be slightly larger than the outer diameter of the second umbrella-shaped cone 30.

[0046] In an optional embodiment of the present invention, the first umbrella-shaped cone 20 and the second umbrella-shaped cone 30 are respectively fixedly mounted on the riser 10 by a bracket. The specific structure of the bracket is sufficient to fix the first umbrella-shaped cone 20 and the second umbrella-shaped cone 30 on the riser 10 without blocking the first annular gap and the second annular gap, which will not be described in detail here.

[0047] In an optional embodiment of the present invention, the bottom port of the riser 10 is a fluid inlet, and the top end of the riser 10 is provided with a plurality of fluid outlet holes 11. With the above structure, drilling fluid enters the riser 10 through the fluid inlet at the bottom end of the riser 10, and then flows out through the plurality of fluid outlet holes 11 at the top end of the riser 10. The drilling fluid flowing out of the fluid outlet holes 11 falls into the first umbrella-shaped cone 20 for defoaming.

[0048] In an optional embodiment of the present invention, at least one dispersion plate 40 is further sleeved on the outside of the riser 10. The dispersion plate 40 is located above the first umbrella-shaped cone 20 and the second umbrella-shaped cone 30. The dispersion plate 40 has a dispersion surface 41 extending downwardly at its inner edge, and the dispersion surface 41 has a plurality of turbulence protrusions 42. The inner edge of the dispersion plate 40 is sealed to the outer wall of the riser 10. The dispersion plate 40 also has a plurality of flow holes 43. The dispersion plate 40 also plays a defoaming role for the drilling fluid. In particular, the plurality of turbulence protrusions 42 on the dispersion plate 40 form turbulence as the drilling fluid flows through the turbulence protrusions 42, which promotes the elimination of bubbles and the escape of gas in the drilling fluid. The flow holes 43 on the dispersion plate 40 also facilitate the upward flow of the gas that has escaped after defoaming.

[0049] In one optional embodiment, the outer diameter of the dispersion plate 40 is smaller than the outer diameter of the first umbrella-shaped cone 20. The drilling fluid flowing out of the riser 10 first flows through the dispersion plate 40 and then falls onto the collection surface 21 of the first umbrella-shaped cone 20. The dispersion plate 40 can perform preliminary defoaming of the drilling fluid.

[0050] Furthermore, multiple dispersion plates 40 are provided on the riser 10. The multiple dispersion plates 40 are arranged sequentially and at intervals along the length of the riser 10. The drilling fluid flows sequentially through the multiple dispersion plates 40, which effectively improves the defoaming effect of the drilling fluid.

[0051] In an optional example of this embodiment, the flow hole 43 is an elongated hole whose length direction is arranged radially along the dispersion plate 40, which further facilitates the upward movement of gas.

[0052] In an optional example of this embodiment, the dispersing plate 40 is shaped like a frustum pyramid, and the flow holes 43 are disposed on the side edges of the dispersing plate 40.

[0053] In one alternative embodiment of this implementation, the turbulent ridge 42 is straight or wavy.

[0054] The present invention also proposes a defoaming device for drilling fluid, which includes a defoaming tank 210 and a vacuum pump 220, such as... Figure 5 , Figure 6 As shown, the defoaming tank 210 is hollow inside, forming a receiving cavity 211. The drilling fluid defoaming structure 100 is disposed inside the receiving cavity 211. The bottom end of the riser 10 is connected to a delivery pipe 50, which seals through the defoaming tank 210 and extends outside the defoaming tank 210. An air extraction hole communicating with the receiving cavity is opened on the outer wall of the defoaming tank 210, and a vacuum pump 220 is sealed to the outside of the air extraction hole. An outlet 212 is opened at the bottom of the defoaming tank 210. After defoaming, the drilling fluid flows out from the outlet 212. The vacuum pump 220 extracts the gas in the receiving cavity 211, putting the receiving cavity 211 into a negative pressure state, further improving the defoaming efficiency of the drilling fluid.

[0055] In an optional embodiment of this method, air extraction holes are provided at the top and middle of the defoaming tank 210, respectively, and each air extraction hole is connected to a vacuum pump 220. This ensures that the middle and upper parts of the accommodating cavity 211 are under negative pressure, while preventing the drilling fluid from being drawn away through the air extraction holes, thus guaranteeing the gas-liquid separation effect.

[0056] In an optional example of this embodiment, a first float valve 60 is provided at the top of the riser 10, which is used to control the flow rate of drilling fluid in the riser 10.

[0057] This invention also proposes a defoaming device 300 for drilling fluid, such as... Figure 7 As shown, the drilling fluid defoaming device 300 includes a first diaphragm pump 310, a second diaphragm pump 320, a heating tank 330, a storage tank 340, a defoaming tank 210, and a vacuum pump 220. The first diaphragm pump 310 is connected to the delivery pipe 50 and pumps drilling fluid into the riser 10 through the delivery pipe 50. The second diaphragm pump 320 is connected to the outlet and inputs the defoamed drilling fluid into the heating tank 330. The storage tank 340 is connected to the heating tank 330 and stores the heated drilling fluid. With the above structure, the drilling fluid is pumped into the defoaming tank 210 by the first diaphragm pump 310 for defoaming. After defoaming, the drilling fluid is pumped out by the second diaphragm pump 320 to the heating tank 330 for heating. The heated drilling fluid is then stored in the storage tank 340 for subsequent sampling operations.

[0058] In an optional embodiment, the drilling fluid defoaming device 300 further includes a cooler 350 connected between the first diaphragm pump 310 and the defoaming tank 210. The cooler 350 is used to cool the drilling fluid to prevent the subsequent defoaming process from being affected by excessively high drilling fluid temperature.

[0059] In one optional example of this implementation, such as Figure 8 As shown, the storage tank 340 has an upper opening and a lower opening. The lower opening is connected to the heating tank 330, and the upper opening is connected to an external testing platform. Inside, a second float valve 341 is installed to control the volume of drilling fluid stored. Once the defoamed drilling fluid in the storage tank 340 reaches a certain volume, the float of the second float valve 341 rises, closing the valve and stopping the storage of drilling fluid. The remaining drilling fluid is then recycled, avoiding unnecessary waste.

[0060] Please refer to Figures 1 to 8 The specific structure and working process of the defoaming structure 100, defoaming device and defoaming equipment 300 proposed in this invention will now be described in detail with reference to an embodiment.

[0061] In this embodiment, the drilling fluid defoaming device 300 includes a first diaphragm pump 310, a second diaphragm pump 320, a heating tank 330, a storage tank 340, a cooler 350, a defoaming tank 210, and a vacuum pump 220. The first diaphragm pump 310 pumps the drilling fluid into the cooler 350. After being cooled by the cooler 350, the drilling fluid enters the defoaming tank 210 for defoaming. After defoaming, the drilling fluid is pumped into the heating tank 330 by the second diaphragm pump 320. After being heated by the heating tank 330, the drilling fluid enters the storage tank 340 for storage.

[0062] The defoaming tank 210 and the vacuum pump 220 constitute a defoaming device. The defoaming structure 100 is disposed in the accommodating cavity 211 of the defoaming tank 210. An air extraction hole communicating with the accommodating cavity 211 is opened on the outer wall of the defoaming tank 210. The air extraction hole is sealed and connected to the vacuum pump 220. A liquid outlet 212 is opened at the bottom of the defoaming tank 210. The liquid outlet 212 is connected to the second diaphragm pump 320 through a liquid delivery pipe. The drilling fluid defoaming structure 100 includes a vertically arranged riser 10 and four dispersion plates 40, three first umbrella-shaped cones 20 and two second umbrella-shaped cones 30 sleeved outside the riser 10. A liquid delivery pipe 50 is connected to the bottom end of the riser 10. The liquid delivery pipe 50 sealably penetrates the defoaming tank 210 and extends out of the defoaming tank 210 and is connected to the cooler 350.

[0063] Multiple outlet holes 11 are provided at the top of the riser 10, through which drilling fluid entering via the delivery pipe 50 flows out. Four dispersion plates 40 are disposed at the top of the riser 10 and arranged sequentially along the axial direction (i.e., the length direction) of the riser 10. The drilling fluid flowing out of the outlet holes 11 falls onto the dispersion plates 40 and slides down the dispersion plates 40 under its own gravity. The dispersion plates 40 are shaped like a frustum of a square pyramid, with the dispersion surface 41 being the outer side of the frustum. The dispersion surface 41 has multiple turbulent ridges 42, each ridge being straight and parallel to the base of the frustum. The multiple turbulent ridges 42 are arranged sequentially and at intervals, making the dispersion surface 41 wavy. The drilling fluid forms turbulence on the dispersion surface of the dispersion plates 40, facilitating the elimination of air bubbles and the escape of gas in the drilling fluid.

[0064] Three first umbrella-shaped cones 20 are located below four dispersion plates 40, and are sequentially spaced along the axial direction of the riser 10. A second umbrella-shaped cone 30 is disposed between two adjacent first umbrella-shaped cones 20. Each first umbrella-shaped cone 20 has a collecting surface 21 extending obliquely upward from its inner edge. The inner edge of the first umbrella-shaped cone 20 has a first annular gap with the outer wall of the riser 10, and a plurality of first notches 22 are evenly distributed on its outer edge. Each second umbrella-shaped cone 30 has a diffusion surface 31 extending obliquely downward from its inner edge. The inner edge of the second umbrella-shaped cone 30 has a second annular gap with the outer wall of the riser 10, and a plurality of second notches 32 are evenly distributed on its outer edge. The plurality of second notches 32 and the plurality of first notches 22 are staggered, and the width of the first annular gap is greater than the width of the second annular gap. The drilling fluid flowing down from the dispersion plate 40 falls onto the collection surface 21 of the first umbrella-shaped cone 20 (i.e., the uppermost first umbrella-shaped cone 20). Under its own gravity, the drilling fluid flows obliquely downward along the collection surface 21 to the inner edge of the first umbrella-shaped cone 20 and falls through the first annular interval onto the diffusion surface 31 of the first second umbrella-shaped cone 30. The drilling fluid then flows obliquely downward on the diffusion surface 31 to the outer edge of the second umbrella-shaped cone 30 and falls through the second notch 32. Thus, the drilling fluid flows sequentially through multiple first umbrella-shaped cones 20 and second umbrella-shaped cones 30 and finally converges at the bottom of the defoaming tank 210.

[0065] The process flow for defoaming using the defoaming structure 100, defoaming device, and defoaming equipment 300 proposed in this invention is as follows:

[0066] Drilling fluid is drawn into the pipeline by the first diaphragm pump 310. Since the temperature of drilling fluid is generally high, which may affect the subsequent defoaming process, the drilling fluid is transported to the cooler 350 for cooling to facilitate subsequent defoaming and degassing. After cooling, the drilling fluid is transported to the defoaming tank 210 for defoaming treatment. If the initial temperature of the drilling fluid drawn in by the first diaphragm pump 310 is appropriate, it can be directly transported to the defoaming tank 210 for defoaming treatment. The defoaming tank 210 is connected to the vacuum pump 220 in three places via pipelines: one at the top of the defoaming tank 210 and two in the middle section, greatly improving the efficiency of the defoaming device. The drilling fluid enters through the delivery pipe 50 at the bottom of the defoaming tank 210 and flows downwards through multiple outlet holes 11 at the top of the riser 10, flowing towards the dispersion plate 40. The dispersion plate 40 has a raised, wavy dispersion surface 41, which creates turbulence during the flow, causing air bubbles in the drilling fluid to escape in a negative pressure environment. Furthermore, elongated flow holes 43 are provided at the joints of each dispersion surface 41 to facilitate the flow of gas after defoaming and degassing. The drilling fluid flows downwards from the dispersion plate 40, passing through the first umbrella-shaped cone 20. Because the inner radius of the first umbrella-shaped cone 20 is larger than that of the second umbrella-shaped cone 30, the drilling fluid can flow downwards from the middle inner hole of the first umbrella-shaped cone 20 to the second umbrella-shaped cone 30. Since the outer edge of the first umbrella-shaped cone 20 has a first notch 22 and the outer edge of the second umbrella-shaped cone 30 has a second notch 32, coupled with their special umbrella-shaped structure, the drilling fluid can be evenly distributed on either the first umbrella-shaped cone 20 or the second umbrella-shaped cone 30, greatly improving the efficiency of defoaming and degassing. To avoid the drilling fluid temperature dropping and affecting its performance, after defoaming, the drilling fluid is pumped into the heating tank 330 by the second diaphragm pump 320 for heating, ensuring that the outlet temperature of the drilling fluid is consistent with the inlet temperature. The heated drilling fluid enters the storage tank 340, which is equipped with a second float valve 341 to control the volume of the drilling fluid. When the drilling fluid reaches a certain volume, the second float valve 341 closes, and the storage of drilling fluid stops.

[0067] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. A defoaming structure for drilling fluid, characterized in that, The defoaming structure of the drilling fluid includes a vertically installed riser and a sleeved portion thereof outside the riser. At least one first umbrella-shaped cone, the first umbrella-shaped cone having a collection surface extending obliquely upward from its inner edge, the inner edge of the first umbrella-shaped cone having a first annular gap with the outer wall of the riser, and the outer edge of the first umbrella-shaped cone being provided with a plurality of first notches; At least one second umbrella-shaped cone, the second umbrella-shaped cone having a diffusion surface extending obliquely downward from its inner edge, the inner edge of the second umbrella-shaped cone having a second annular gap with the outer wall of the riser, and the outer edge of the second umbrella-shaped cone being provided with a plurality of second notches; The multiple second gaps and the multiple first gaps are staggered, and the width of the first annular interval is greater than the width of the second annular interval.

2. The defoaming structure of the drilling fluid as described in claim 1, characterized in that, The riser is fitted with a plurality of first umbrella-shaped cones and a plurality of second umbrella-shaped cones, which are staggered along the length of the riser.

3. The defoaming structure of the drilling fluid as described in claim 1, characterized in that, The bottom end of the riser is the liquid inlet, and the top end of the riser has multiple liquid outlet holes.

4. The defoaming structure of the drilling fluid as described in claim 1, characterized in that, At least one dispersion plate is also sleeved on the outside of the riser. The dispersion plate is located above the first umbrella-shaped cone and the second umbrella-shaped cone. The dispersion plate has a dispersion surface that extends downward at an incline from its inner edge. The dispersion surface has a plurality of turbulence protrusions. The inner edge of the dispersion plate is sealed to the outer wall of the riser. The dispersion plate is also provided with a plurality of flow holes.

5. The defoaming structure of the drilling fluid as described in claim 4, characterized in that, The outer diameter of the dispersion plate is smaller than the outer diameter of the first umbrella-shaped cone.

6. The defoaming structure of the drilling fluid as described in claim 4, characterized in that, The flow passage is an elongated hole, and the length of the elongated hole is arranged radially along the dispersion plate.

7. A defoaming device for drilling fluid, characterized in that, The defoaming device for the drilling fluid includes a defoaming tank and a vacuum pump. The defoaming tank is hollow and forms a accommodating cavity. The defoaming structure of the drilling fluid as described in any one of claims 1 to 6 is disposed in the accommodating cavity. A delivery pipe is connected to the bottom end of the riser. The delivery pipe seals through the defoaming tank and extends out of the defoaming tank. An air extraction hole communicating with the accommodating cavity is opened on the outer wall of the defoaming tank. The vacuum pump is sealed to the outside of the air extraction hole. An outlet is opened at the bottom of the defoaming tank.

8. The defoaming device for drilling fluid as described in claim 7, characterized in that, The defoaming tank has air extraction holes at its top and in its middle, and each air extraction hole is connected to the vacuum pump.

9. A defoaming device for drilling fluid, characterized in that, The defoaming equipment for the drilling fluid includes a first diaphragm pump, a second diaphragm pump, a heating tank, a storage tank, and a defoaming device as described in claim 7. The first diaphragm pump is connected to a delivery pipe and pumps drilling fluid into the riser through the delivery pipe. The second diaphragm pump is connected to the outlet and inputs the defoamed drilling fluid into the heating tank. The storage tank is connected to the heating tank and stores the heated drilling fluid.

10. The defoaming equipment for drilling fluid as described in claim 9, characterized in that, The defoaming device for the drilling fluid also includes a cooler connected between the first diaphragm pump and the defoaming tank.

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