Device for vacuum preloading treatment of high-water-content oilfield drilling waste liquid polluted mud

Abstract

The invention relates to the technical field of oil field waste liquid sludge treatment, in particular to a device for vacuum preloading treatment of high-water-content oil field drilling waste liquid polluted mud, which comprises an oil field storage seat, a box body and an insulating layer, the box body is fixedly embedded in the oil field storage seat, the insulating layer is fixedly sleeved on the outer wall of the box body, and the insulating layer is fixedly sleeved on the outer wall of the box body. A freeze-thaw waste liquid treatment structure is arranged on one side of the upper portion of the oil field storage base. According to the device for treating the high-water-content oilfield drilling waste liquid polluted mud through vacuum preloading, low-temperature freezing liquid generated in the liquid refrigerating machine can be conveyed into the freezing liquid pipe through the conveying pump, due to the fact that the freezing point of crude oil is lower than that of water, different freezing and thawing temperatures are controlled to enable water and oil to be frozen and thawed separately, the water is frozen and thawed firstly, and part of oil is discharged through vacuumizing; the freezing and thawing temperature is reduced, part of water is discharged, no chemical is added, pollution is reduced, and the problem that chemical agents of the device for treating the high-water-content oilfield drilling waste liquid polluted mud through vacuum preloading are difficult to treat is solved.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield waste liquid sludge treatment, in particular to a device for vacuum pre-pressing treatment of high-water-content oilfield drilling waste liquid polluted mud. Background Art

[0002] In the oil fields of Shaanxi Province, oil field drilling produces a large amount of oily waste liquid, which is discharged into the land around the oil fields without treatment. The drilling waste liquid is mixed with the local soil (silt) to form sludge. The components of oily waste water are usually petroleum hydrocarbons, organic matter (COD), and heavy metals, so the mud contaminated by drilling oily waste water is often also sludge with pollutants.

[0003] For example, the authorization announcement number "CN219569010U" is named a vacuum pre-pressing sludge treatment device. The lifting and lowering of the output end of the electric push rod enables the two connecting short columns to be lifted and lowered along the direction of the slideway, and then the two mounting blocks and two scrapers can be lifted and lowered, so as to adjust the depth of sludge treatment. However, the existing vacuum pre-pressing sludge treatment device has a high moisture content of oily sludge after filter pressing and dehydration, generally above 70%, and the moisture content of untreated sludge can be as high as 99%. The presence of a large amount of water makes the oily sludge huge in volume, making it difficult to store and dispose of;

[0004] At the same time, the "tertiary oil recovery" method is usually used in the oil production process, namely gas injection, chemical injection, and ultrasonic stimulation to improve the recovery rate of crude oil, but this will also add a large amount of chemical agents, increasing the difficulty of sludge treatment; although the sludge contaminated by oil field drilling wastewater has a relatively low oil content, its petroleum hydrocarbon content far exceeds the petroleum hydrocarbon limit in clean soil. These petroleum hydrocarbons harm the soil and plants, and it is still crucial to separate oil from the sludge. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of difficult sludge disposal, increased difficulty in chemical agent treatment and serious petroleum pollution in vacuum preloading sludge treatment equipment, and to propose a vacuum preloading device for treating mud contaminated by high water content oilfield drilling waste liquid.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for vacuum preloading treatment of mud contaminated by high-water-content oilfield drilling waste liquid is designed, comprising an oilfield storage seat, a box body and an insulating layer, wherein the box body is fixedly embedded in the interior of the oilfield storage seat, and the insulating layer is fixedly sleeved on the outer wall of the box body, a freeze-thaw waste liquid treatment structure is provided on one side above the oilfield storage seat, a vacuum preloading drainage structure is provided on the other side above the oilfield storage seat, a geomembrane laying layer structure is provided on the interior of the box body, a drainage board supporting and positioning structure is provided on the inner bottom surface of the box body, and drainage board bracket structures are provided on both sides of the top of the oilfield storage seat.

[0008] Preferably, the freeze-thaw waste liquid processing structure includes a liquid refrigerator and a freezing liquid pipe. The liquid refrigerator is fixedly installed on one side of the top of the oil field storage seat. One side of the liquid refrigerator is fixedly connected to multiple freezing liquid pipes, and a delivery pump is fixedly installed above the multiple freezing liquid pipes. The inner sides of the multiple freezing liquid pipes are fixedly connected to multiple shunt pipes, and the other end side walls of the multiple freezing liquid pipes are fixedly connected to circulating pipes, and a circulating pump is fixedly installed above the multiple circulating pipes.

[0009] Preferably, the plurality of freezing liquid pipes are fixedly arranged inside the box, and the plurality of freezing liquid pipes are arranged in parallel and at equal distances from each other.

[0010] Preferably, the vacuum preloading drainage structure includes a pump base and a vacuum main pipe, the pump base is fixedly installed on the other side above the oil field storage base, two vacuum pumps are fixedly installed above the pump base, the rear sides of the two vacuum pumps are fixedly connected to drainage pipes, the other ends of the two vacuum pumps are fixedly connected to two vacuum main pipes, and the other sides of the two vacuum main pipes are fixedly connected to PVD drainage plates.

[0011] Preferably, the drainage board support and positioning structure includes a pad and a transverse groove, a plurality of the pads are fixedly installed on the inner bottom end of the box, two support blocks are fixedly connected above the pads, a transverse groove is fixedly connected above the two support blocks, and a splicing hole is fixedly opened above the two transverse grooves.

[0012] Preferably, the drainage board support structure includes vertical poles and transverse frames, and a plurality of the vertical poles are fixedly installed on both sides of the top of the oil field storage seat, and two rows of transverse frames are fixedly connected to the inner sides of the tops of the plurality of vertical poles, and a plurality of bolts are threadedly connected to the inner sides of the two rows of transverse frames, and the lower ends of the plurality of bolts are threadedly connected to suspension plates.

[0013] Preferably, the top ends of the plurality of PVD drainage plates are fixedly connected to the bottom of the suspension plate, and the lower ends of the plurality of PVD drainage plates are movably engaged with the top of the splicing hole.

[0014] Preferably, the geomembrane laying layer structure includes a geomembrane and a woven cloth, the woven cloth is movably arranged on the inner top surface of the box, the top of the woven cloth is movably connected to the geotextile, and the top of the geotextile is movably connected to the geomembrane.

[0015] Preferably, a side edge of the geomembrane is disposed opposite to the outer sides of the plurality of refrigerant liquid pipes, and the other side edge of the geomembrane is disposed opposite to the inner wall of the box.

[0016] Preferably, the outer wall of the insulating layer is fixedly connected to the inner wall of the oil field storage seat, and the side wall of the box body is higher than the inner side of the oil field storage seat by a certain distance.

[0017] The invention proposes a vacuum pre-pressing device for treating mud contaminated by waste drilling liquid in an oil field with high water content. The beneficial effect is that the low-temperature freezing liquid generated in a liquid refrigerator can be transported to a freezing liquid pipe through a delivery pump. Since the freezing point of crude oil is lower than that of water, different freeze-thaw temperatures are controlled to make water and oil partially freeze-thawed. The water is firstly frozen and thawed, and part of the oil is discharged by vacuum pumping. Then, the freeze-thaw temperature is lowered to discharge part of the water. This can realize efficient and convenient separation of oil and water, and does not require the addition of chemicals to reduce pollution, so that the difficulty of chemical agent treatment of the device for vacuum pre-pressing the treatment of mud contaminated by waste drilling liquid in an oil field with high water content can be solved.

[0018] The method of vertical combined horizontal freeze-thaw is adopted to make the freeze-thaw range of the sludge as large as possible and reduce the freeze-thaw difference in the vertical direction. It can be achieved by simply changing the shape of the pipeline. It can simply and efficiently treat the untreated sludge. The treatment of sludge crude oil and water inside the box is relatively simple and has few operating steps. In this way, the storage and disposal of mud contaminated by high-water content oilfield waste liquid is relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 for Figure 1 A front cross-sectional schematic diagram of

[0021] Figure 3 for Figure 1 A schematic cross-sectional view of the back side of the device;

[0022] Figure 4 for Figure 1 A schematic top cross-sectional view of

[0023] Figure 5 for Figure 2 Enlarged cross-sectional view of part A in the middle;

[0024] Figure 6 for Figure 2 Enlarged cross-sectional view of part B in the middle;

[0025] Figure 7 for Figure 3 Enlarged cross-sectional view of the middle C part;

[0026] Figure 8 for Figure 4 Enlarged cross-sectional view of the middle D part;

[0027] Fig. 9 for Figure 3 Enlarged cross-sectional view of part E in the middle.

[0028] In the figure: 1, oil field storage seat, 2, box body, 3, insulation layer, 4, freeze-thaw waste liquid treatment structure, 41, liquid refrigerator, 42, delivery pump, 43, freezing liquid pipe, 44, shunt pipe, 45, circulation pump, 46, circulation pipe, 5, geomembrane laying layer structure, 51, geomembrane, 52, geotextile, 53, woven cloth, 6, drainage board support and positioning structure, 61, cushion block, 62, support block, 63, transverse groove, 64, splicing hole, 7, vacuum preloading drainage structure, 71, pump base, 72, vacuum pump, 73, vacuum mother pipe, 74, PVD drainage board, 75, drainage pipe, 8, drainage board bracket structure, 81, vertical pole, 82, horizontal frame, 83, bolt, 84, suspension plate. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings:

[0030] Embodiment 1:

[0031] See also Figure 1-9 In the present embodiment, a device for vacuum preloading treatment of high-water-content oilfield drilling waste liquid-contaminated mud comprises an oilfield storage seat 1, a box body 2 and an insulating layer 3, wherein the box body 2 is fixedly embedded in the interior of the oilfield storage seat 1, and the insulating layer 3 is fixedly sleeved on the outer wall of the box body 2, and the insulating layer 3 is wrapped on the outer side of the box body 2 with rubber and plastic insulating material to reduce the heat exchange between the interior of the box body 2 and the outside world, a freeze-thaw waste liquid treatment structure 4 is provided on one side above the oilfield storage seat 1, a vacuum preloading drainage structure 7 is provided on the other side above the oilfield storage seat 1, a geomembrane laying layer structure 5 is provided on the interior of the box body 2, a drainage board support and positioning structure 6 is provided on the inner bottom surface of the box body 2, and drainage board bracket structures 8 are provided on both sides of the top of the oilfield storage seat 1.

[0032] The freeze-thaw waste liquid treatment structure 4 includes a liquid refrigerator 41 and a freezing liquid pipe 43. The liquid refrigerator 41 is fixedly installed on one side of the top of the oil field storage seat 1. The liquid refrigerator 41 is a mature existing technology. After the liquid refrigerator 41 is connected to the power supply and started, it can produce low-temperature freezing liquid. One side of the liquid refrigerator 41 is fixedly connected with multiple freezing liquid pipes 43. The freezing liquid pipes 43 are steel pipes with NaCl solution inside. The freezing liquid pipes 43 are arranged in three rows. The three rows of freezing liquid pipes 43 are evenly arranged in the box 2 storing a mixture of oil and water through a transversely connected diversion pipe 44. A delivery pump 42 is fixedly installed above the multiple freezing liquid pipes 43.

[0033] When the delivery pump 42 is turned on, the delivery pump 42 can deliver the low-temperature refrigerant generated inside the liquid refrigerator 41 to the refrigerant pipe 43, and then the refrigerant pipe 43 can deliver the low temperature to the storage medium inside the box 2. The inner sides of the multiple refrigerant pipes 43 are fixedly connected with multiple shunt pipes 44, and the other end side walls of the multiple refrigerant pipes 43 are fixedly connected with a circulation pipe 46. The circulation pipe 46 is connected to the liquid refrigerator 41 again at the drainage end of the refrigerant. In this way, the refrigerant after heat exchange can be sent back to the liquid refrigerator 41 for recirculation and refrigeration by starting the circulation pump 45. The circulation pump 45 is fixedly installed above the multiple circulation pipes 46. The multiple refrigerant pipes 43 are fixedly arranged inside the box 2, and the multiple refrigerant pipes 43 are arranged in parallel with each other at equal distances.

[0034] After the liquid refrigerator 41 is connected to the power supply and started, it can produce low-temperature refrigerant. There are three rows of refrigerant pipes 43. The three rows of refrigerant pipes 43 are evenly arranged in the box 2 storing the mixture of oil and water through the transversely connected diversion pipes 44. When the delivery pump 42 is turned on, the delivery pump 42 can deliver the low-temperature refrigerant generated inside the liquid refrigerator 41 to the refrigerant pipe 43, and then the refrigerant pipe 43 can deliver the low temperature to the storage medium inside the box 2. The circulation pipe 46 is connected to the liquid refrigerator 41 again at the drainage end of the refrigerant.

[0035] In this way, the circulating pump 45 can be started to send the refrigerant after heat exchange back to the liquid refrigerator 41 for further circulation and refrigeration. Since the freezing point of crude oil is lower than that of water, different freeze-thaw temperatures are controlled to make the water and oil partially freeze-thaw. The water is first frozen and thawed, and part of the oil is discharged by vacuum. Then the freeze-thaw temperature is lowered to discharge part of the water. This can achieve efficient and convenient oil and water separation operations, without the need to add chemicals to reduce pollution, and solves the chemical treatment difficulties of the device for vacuum pre-pressing the mud contaminated by drilling waste liquid in oil fields with high water content.

[0036] The vacuum preloading drainage structure 7 includes a pump base 71 and a vacuum main pipe 73. The pump base 71 is fixedly installed on the other side above the oil field storage base 1. Two vacuum pumps 72 are fixedly installed above the pump base 71. The pump base 71 is used to support and fix two high-power vacuum pumps 72. The rear sides of the two vacuum pumps 72 are fixedly connected with a drainage pipe 75. The other ends of the two vacuum pumps 72 are fixedly connected with two vacuum main pipes 73. Vacuum preloading is one of the mechanical dehydration methods.

[0037] When draining, the vacuum pump 72 will draw air out of the PVD drain board 74 along the vacuum main pipe 73 to form a vacuum, and the moisture and oil in the sludge will migrate toward the PVD drain board 74. The other side of the two vacuum main pipes 73 is fixedly connected with a PVD drain board 74. The PVD drain board 74 adopts the existing vertical drain board. The drain board is made of PVD material with a thickness of 4 mm. The lower end of the PVD drain board 74 is inserted into the bottom support structure of the box body 2 for positioning.

[0038] The drainage board support and positioning structure 6 includes a pad 61 and a transverse groove 63. A plurality of pads 61 are fixedly installed at the inner bottom end of the box body 2. The pads 61 and the support blocks 62 are both made of stainless steel. The pads 61 cooperate with the support blocks 62 on both sides to be placed at the inner bottom end of the box body 2. Two support blocks 62 are fixedly connected above the pad 61. The transverse groove 63 is fixedly connected above the two support blocks 62. The joint hole 64 at the top of the transverse groove 6 support has the same width as the lower end of the PVD drainage board 74. In this way, the PVD drainage board 74 can be inserted into the joint groove 64 for positioning and placement, which can better determine the setting position of the PVD drainage board 74. The joint holes 64 are fixedly opened above the two transverse grooves 63.

[0039] The method of vertical combined horizontal freeze-thaw is adopted to make the freeze-thaw range of the sludge as large as possible, reduce the freeze-thaw difference in the vertical direction, and can be achieved by simply changing the shape of the pipeline. It can simply and efficiently treat the untreated sludge. The treatment of sludge crude oil and water inside the box 2 is relatively simple and has few operating steps. In this way, the storage and disposal of mud contaminated by high-water content oilfield waste liquid is relatively simple.

[0040] The drainage board support structure 8 includes vertical poles 81 and transverse frames 82. Multiple vertical poles 81 are fixedly installed on both sides of the top of the oil field storage seat 1. The vertical poles 81 are fixed on both sides of the upper part of the oil field storage seat 1. The transverse frames 82 supported by the vertical poles 81 span the top of the box body 2. Two rows of transverse frames 82 are fixedly connected to the inner side of the top of the multiple vertical poles 81. The inner sides of the two rows of transverse frames 82 are threadedly connected with multiple bolts 83. The inner side of the transversely arranged transverse frames 82 can be screwed with bolts 83 to fix the suspension plate 84 at the bottom, so that the suspension plate 84 can be vertically arranged inside the box body 2 with the lower end PVD drainage plate 74 to facilitate water absorption and discharge. The lower ends of the multiple bolts 83 are threadedly connected with the suspension plate 84. The top ends of the multiple PVD drainage plates 74 are fixedly connected to the bottom of the suspension plate 84, and the lower ends of the multiple PVD drainage plates 74 are movably connected to the top of the splicing hole 64.

[0041] Working principle:

[0042] The vacuum pre-pressing device is used to treat mud contaminated by drilling waste liquid in oil fields with high water content. The separation of oil and water is carried out through the principle of freeze-thaw. Specifically, there is a significant difference in the freezing points of water and oil. Some water phases will expand when solidifying, thereby destroying the cohesion of the oil phase. With the accumulation of condensed water droplets, large enough cracks will be formed, allowing non-condensed water droplets to penetrate and aggregate, and eventually leading to the separation of oil and water during thawing. After freeze-thaw treatment, the oil droplets form tiny black particles that are separated from water and suspended in water. In this way, the separation of water and oil can be achieved, making it convenient to pump out and discharge the water.

[0043] At the same time, due to vertical freezing and thawing, the degree of sludge freezing and thawing is poor at locations far away from the freeze-thaw pipe. Due to the limitations of the bottom boundary and top insulation, the heat transfer rate of the sludge is slow. However, the heat transfer in the middle is relatively fast, resulting in certain differences in the degree of freezing of the sludge in the vertical direction. Therefore, according to the low unfrozen moisture content and large frozen heave volume of the low-temperature part, a circle is formed around the frozen pipe to form a rapid freezing layer. The method of vertical combined horizontal freezing and thawing is used to make the freezing and thawing range of the sludge as large as possible, reduce the freezing and thawing differences in the vertical direction, and it can be achieved by simply changing the shape of the pipe;

[0044] The freeze-thaw isolation oil and water structure of the device for vacuum preloading to treat mud contaminated by high water content oilfield drilling waste fluid:

[0045] After the liquid refrigerator 41 is connected to the power supply and started, it can produce low-temperature refrigerant. There are three rows of refrigerant pipes 43. The three rows of refrigerant pipes 43 are evenly arranged in the box 2 storing the mixture of oil and water through the transversely connected diversion pipes 44. When the delivery pump 42 is turned on, the delivery pump 42 can deliver the low-temperature refrigerant generated inside the liquid refrigerator 41 to the refrigerant pipe 43, and then the refrigerant pipe 43 can deliver the low temperature to the storage medium inside the box 2. The circulation pipe 46 is connected to the liquid refrigerator 41 again at the drainage end of the refrigerant.

[0046] In this way, the circulating pump 45 can be started to send the refrigerant after heat exchange back to the liquid refrigerator 41 for further circulation and refrigeration. Since the freezing point of crude oil is lower than that of water, different freeze-thaw temperatures are controlled to make water and oil freeze and thaw separately. First, freeze and thaw the water, vacuumize and discharge part of the oil, and then lower the freeze-thaw temperature to discharge part of the water. This can achieve efficient and convenient oil and water separation operation.

[0047] PVD vacuum preloading drainage structure of the device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud:

[0048] Two vacuum pumps 72 are fixedly installed above the pump base 71. The pump base 71 is used to support and fix two high-power vacuum pumps 72. Vacuum preloading is one of the mechanical dehydration methods. When draining water, the vacuum pump 72 will draw air from the PVD drain board 74 along the vacuum main pipe 73 to form a vacuum, and the moisture and oil in the sludge will migrate toward the PVD drain board 74. The PVD drain board 74 adopts the existing vertical drain board. The drain board is made of PVD material with a thickness of 4mm. The lower end of the PVD drain board 74 is inserted into the bottom support structure of the box body 2 for positioning;

[0049] PVD drainage board support structure of the device for vacuum preloading to treat mud contaminated by high water content oilfield drilling waste liquid:

[0050] The pad 61 and the support block 62 are both made of stainless steel. The pad 61 is placed at the bottom of the box 2 with the support blocks 62 on both sides being parallel. Two support blocks 62 are fixedly connected to the top of the pad 61. A transverse groove 63 is fixedly connected to the top of the two support blocks 62. The joint hole 64 at the top of the transverse groove 6 support has the same width as the lower end of the PVD drain plate 74. In this way, the PVD drain plate 74 can be inserted into the joint groove 64 for positioning and placement, which can better determine the setting position of the PVD drain plate 74.

[0051] The vertical poles 81 are fixed on both sides above the oil field storage seat 1, and the horizontal frame 82 supported by the vertical poles 81 spans above the box body 2. The inner side of the horizontally arranged horizontal frame 82 can be screwed with bolts 83 to fix the suspension plate 84 below, so that the suspension plate 84 can be vertically arranged inside the box body 2 with the lower end PVD drainage plate 74 to facilitate water absorption and discharge.

[0052] Embodiment 2:

[0053] See also Figure 1-9: In this embodiment, a device for vacuum preloading to treat mud contaminated by high-water-content oilfield drilling waste liquid also includes a geomembrane laying layer structure 5 including a geomembrane 51 and a woven cloth 53. The woven cloth 53 is movably arranged on the inner top surface of the box body 2. The top of the woven cloth 53 is movably connected to a geotextile 52. The top of the geotextile 52 is movably connected to a geomembrane 51. The geomembrane 51 is mainly laid on the sludge surface inside the box body 2 to prevent water seepage and air leakage.

[0054] At the same time, the geotextile 52 separates the sludge and the geomembrane 51 from direct contact, which can prevent the sludge from corroding the geomembrane. The woven cloth is made of waterproof fiber cloth, which can serve as a flat barrier and protection function. The three are installed in sequence and laid on the surface above the sludge. The side of the geomembrane 51 is arranged opposite to the outer sides of multiple refrigerant pipes 43, and the other side of the geomembrane 51 is arranged opposite to the inner wall of the box body 2. The outer wall of the insulating layer 3 is fixedly connected to the inner wall of the oil field storage seat 1, and the side wall height of the box body 2 is higher than the inner side of the oil field storage seat 1 by a certain distance.

[0055] Working principle:

[0056] The geomembrane 51 is mainly laid on the sludge surface inside the box 2 to prevent water seepage and air leakage. At the same time, the geotextile 52 separates the sludge and the geomembrane 51 from direct contact, which can prevent the sludge from corroding the geomembrane. The woven cloth is made of waterproof fiber cloth and can serve as a flat barrier and protection function. The three are installed in sequence and laid on the surface above the sludge.

[0057] Although the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A device for vacuum preloading to treat mud contaminated by high-water-content oilfield drilling waste liquid, comprising an oilfield storage seat (1), a box (2) and an insulating layer (3), wherein the box (2) is fixedly embedded in the interior of the oilfield storage seat (1), and the insulating layer (3) is fixedly sleeved on the outer wall of the box (2), characterized in that: A freeze-thaw waste liquid treatment structure (4) is provided on one side above the oilfield storage seat (1), a vacuum preload drainage structure (7) is provided on the other side above the oilfield storage seat (1), a geomembrane laying layer structure (5) is provided on the upper part of the box body (2), a drainage board support and positioning structure (6) is provided on the inner bottom surface of the box body (2), and drainage board support structures (8) are provided on both sides of the top of the oilfield storage seat (1).

2. The device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud according to claim 1 is characterized in that: The freeze-thaw waste liquid treatment structure (4) comprises a liquid refrigerator (41) and a freezing liquid pipe (43). The liquid refrigerator (41) is fixedly installed on one side of the top of the oil field storage seat (1). One side of the liquid refrigerator (41) is fixedly connected to multiple freezing liquid pipes (43). A delivery pump (42) is fixedly installed above the multiple freezing liquid pipes (43). The inner sides of the multiple freezing liquid pipes (43) are fixedly connected to multiple shunt pipes (44). The other end side walls of the multiple freezing liquid pipes (43) are fixedly connected to a circulation pipe (46). A circulation pump (45) is fixedly installed above the multiple circulation pipes (46).

3. The device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud according to claim 2 is characterized in that: The plurality of freezing liquid pipes (43) are fixedly arranged inside the box body (2), and the plurality of freezing liquid pipes (43) are arranged in parallel and at equal distances from each other.

4. The device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud according to claim 1 is characterized in that: The vacuum preloading drainage structure (7) comprises a pump base (71) and a vacuum main pipe (73); the pump base (71) is fixedly installed on the other side above the oil field storage base (1); two vacuum pumps (72) are fixedly installed above the pump base (71); the rear sides of the two vacuum pumps (72) are fixedly connected to drainage pipes (75); the other ends of the two vacuum pumps (72) are fixedly connected to two vacuum main pipes (73); and the other sides of the two vacuum main pipes (73) are fixedly connected to PVD drainage plates (74).

5. The device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud according to claim 1 is characterized in that: The drainage board support and positioning structure (6) comprises a cushion block (61) and a transverse groove (63); a plurality of the cushion blocks (61) are fixedly mounted on the inner bottom end of the box body (2); two support blocks (62) are fixedly connected above the cushion blocks (61); transverse grooves (63) are fixedly connected above the two support blocks (62); and joint holes (64) are fixedly opened above the two transverse grooves (63).

6. The device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud according to claim 1 is characterized in that: The drainage board support structure (8) comprises a vertical pole (81) and a horizontal frame (82), wherein a plurality of the vertical poles (81) are fixedly mounted on both sides of the top of the oil field storage seat (1), two rows of horizontal frames (82) are fixedly connected to the inner sides of the tops of the plurality of vertical poles (81), a plurality of bolts (83) are threadedly connected to the inner sides of the two rows of horizontal frames (82), and a suspension plate (84) is threadedly connected to the lower ends of the plurality of bolts (83).

7. The device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud according to claim 4 is characterized in that: The top ends of the plurality of PVD drainage plates (74) are fixedly connected to the bottom of the suspension plate (84), and the lower ends of the plurality of PVD drainage plates (74) are movably engaged with the top of the splicing hole (64).

8. The device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud according to claim 1 is characterized in that: The geomembrane laying layer structure (5) comprises a geomembrane (51) and a woven cloth (53); the woven cloth (53) is movably arranged on the inner top surface of the box body (2); the top of the woven cloth (53) is movably connected to a geotextile (52); and the top of the geotextile (52) is movably connected to a geomembrane (51).

9. The device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud according to claim 8, characterized in that: The side edge of the geomembrane (51) is arranged opposite to the outer sides of the plurality of refrigerant liquid pipes (43), and the other side edge of the geomembrane (51) is arranged opposite to the inner wall of the box body (2).

10. The device for vacuum preloading treatment of high water content oilfield drilling waste liquid contaminated mud according to claim 1, characterized in that: The outer wall of the insulating layer (3) is fixedly connected to the inner wall of the oil field storage seat (1), and the side wall of the box body (2) is higher than the inner side of the oil field storage seat (1) by a certain distance.

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