Oily drilling cutting treatment device and preparation method of demulsifier

Abstract

The invention discloses an oil-containing drilling cutting treatment device and a preparation method of a demulsifier, the treatment device comprises an oil slinger, a grinding machine and a particle size screener, the oil slinger comprises a first base body shell, the grinding machine comprises a second base body shell, a first rotating roller and a second rotating roller are obliquely arranged in the second base body shell, and the first rotating roller and the second rotating roller are arranged in the first base body shell. Cutting blades are evenly and fixedly connected to the surfaces of the first rotating roller and the second rotating roller, the granularity screening device comprises a box body, the box body is obliquely arranged, a feeding hopper is arranged above the top of the box body and connected with a second discharging pipeline, a spray head is arranged on the side face of the inner top of the box body, and a screen set with the same inclination degree as the box body is arranged in the box body. The invention further provides a preparation method of the demulsifying agent, and the obtained demulsifying agent is suitable for the oil-containing drilling cutting treatment device disclosed by the invention. The oil-containing drilling cuttings are subjected to multi-stage treatment, and the treatment effect on the oil-containing drilling cuttings is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of oil-based drill cuttings treatment, and particularly relates to an oil-based drill cuttings treatment device and a preparation method of a demulsifier. Background Art

[0002] A large amount of solid waste is generated during the drilling operation in shale gas exploration and development. However, due to the limited shale gas production and high decline rate, in order to obtain reasonable investment returns, special drilling operation processes need to be adopted. When drilling reaches the deep shale target formation, horizontal drilling is required. To ensure the safe drilling of the horizontal well section, oil-based drilling fluids with relatively high costs are usually used for drilling, thereby generating hazardous waste oil-based drill cuttings, which have an oil content as high as 15% - 20%, complex compositions, high treatment difficulties, and high recovery values. If the oil-based drill cuttings are not harmlessly treated, it will cause serious pollution to the oil and gas field environment. It is necessary to first recover the oil-based drill cuttings, and after treatment to meet the standards, they can be discharged or directly reinjected into the formation.

[0003] Currently, the common treatment methods for oil-based drill cuttings at home and abroad usually include incineration method, extraction method, pyrolysis method, coagulation treatment method, reinjection method, biological treatment method, etc. However, the existing treatment methods have low oil removal rates and are prone to cause secondary pollution; the treatment is not timely, and it is impossible to collect, treat, and discharge in a timely manner, with a long treatment cycle. Among them, the drill cuttings reinjection method is a method of slurrying drilling waste and injecting it into a suitable formation. The drilling cuttings are ground and screened and an appropriate amount of water is added. If necessary, a suitable thickening agent can be added to the drilling fluid before injecting into the formation. After selecting a suitable formation, all the drill cuttings or sewage can be reinjected in place, reducing transportation and treatment costs. At present, the research and application in this field in China are still in the initial stage. Controlling the drill cuttings to a reasonable particle size to facilitate large-scale injection into the wellbore is one of the key elements that need to be controlled in the drill cuttings reinjection technology. The existing grinding devices in China are mostly used for grinding dry solid-phase particles, with poor grinding effects on oil-based drill cuttings, low grinding efficiency, and problems such as too large a particle volume range generated by grinding resulting in injection blockage. Therefore, it is difficult to apply conventional grinding technologies on a large scale to the grinding operation of oil-based drill cuttings.

[0004] Patent Publication No. CN102861756A discloses an oil-based drilling fluid waste drying treatment device and method, which uses an oil centrifuge to dry oil-based drill cuttings and waste (oil content 10% - 30%), reducing the oil content to less than 5%. Then, a high-speed centrifuge is used to separate the liquid phase centrifuged by the oil centrifuge for solid-liquid separation, and the pure oil product is recovered for reuse. This invention does not consider that some oil-based drill cuttings have large particle sizes and high viscosities, and it is not easy to separate oil and solids during the drying and centrifugation stage, and there is a risk of damaging the device.

[0005] Patent publication number CN113833424A discloses an oil-containing drill cuttings processing device and method, including a heating and cleaning processing area, a sludge pump, a controller and a three-phase separation area. The heating and cleaning processing area is used to mix the oil-containing drill cuttings to be processed with a cleaning liquid to form a mixed liquid, and the mixed liquid is heated and stirred to clean the oil-containing drill cuttings in the mixed liquid. The controller is used to control the heating temperature and stirring time of the mixed liquid. The sludge pump is used to transfer the mixed liquid treated by the heating and cleaning processing area to the three-phase separation area. The three-phase separation area is used to settle the mixed liquid transferred by the sludge pump to separate the oil, cleaning liquid and solid drill cuttings in the mixed liquid. The invention patent heats, stirs and settles the mixed liquid in turn, so that the oil content of the treated drilling cuttings is less than 1%, which effectively improves the cleaning efficiency of the drilling cuttings processing device. The invention patent requires the addition of a cleaning agent, which may pollute the oil phase in the oil-containing drill cuttings and affect the recovery and utilization of the oil phase. Summary of the invention

[0006] In view of the problems existing in the prior art, the present application provides an oil-containing drill cuttings processing device, comprising: an oil thrower, a grinder and a particle size screener, wherein:

[0007] The oil-splitting machine comprises a first base shell, a vertical separation tube body is arranged inside the first base shell, and the side wall of the separation tube body is wrapped by a filter screen; a feed cavity is arranged outside the bottom of the first base shell, the bottom of the separation tube body is connected to the feed cavity, and the feed cavity is connected to the feed pipeline; the top of the separation tube body extends to the outside of the first base shell, and a discharge port is arranged on the circumferential surface of the separation tube body, and the discharge port is connected to the feed port of the grinder through the first discharge pipeline; a stirring device is arranged inside the separation tube body;

[0008] The grinding machine comprises a second base shell, a first roller and a second roller are obliquely arranged inside the second base shell, cutting blades are evenly fixed to the surfaces of the first roller and the second roller, and the cutting blades gradually become smaller from top to bottom along the rollers; the cross section of the second base shell is elliptical, and the size of the shell gradually decreases from top to bottom, and the top of the second base shell is connected to the first discharge pipe; the first sieve plate and the second sieve plate are overlapped and arranged at the bottom of the second base shell, the first sieve plate is located above the second sieve plate, the aperture sizes of the two sieve plates are the same, and apertures of different mesh sizes are formed by staggered placement; a first discharge port is arranged below the second sieve plate, and the first discharge port is connected to the feed port of the particle size screener through the second discharge pipe;

[0009] The particle size sieve includes a box body which is inclined. Above the top of the box body, a feeding funnel is provided. The feeding funnel is connected to a second discharge pipeline. A spray head is provided on the inner top surface of the box body. Inside the box body, a screen group with the same inclination as the box body is provided. The screen group is composed of a plurality of screens with different mesh numbers spliced in sequence from high to low. The number of the discharge ports is the same as the number of the screens, and the discharge ports are correspondingly arranged below the screens one by one.

[0010] Further, the stirring device includes a stirring shaft with stirring blades provided thereon. The top of the stirring shaft is connected to a first motor above the outside of the separation pipe body. A liquid discharge port is further provided at the bottom of the first base shell for discharging oil and water.

[0011] Further, an ultrasonic horn is inserted inside the feeding cavity.

[0012] Further, an upper bracket is fixed above the outside of the second base shell. A second motor is bolted and installed on the right side of the upper bracket. The power output end of the second motor is connected to a transmission shaft. Two groups of first gear sets and second gear sets that can move along the transmission shaft are provided on the transmission shaft. The first gear set is connected to a first rotating shaft, and the second gear set is connected to a second rotating shaft. A first roller is sleeved and fixed on the first rotating shaft, and the first rotating shaft penetrates through a through hole at the center of the first roller. A second roller is sleeved and fixed on the second rotating shaft, and the second rotating shaft penetrates through a through hole at the center of the second roller. The ends of the two rotating shafts are rotatably installed on a cross bar, and both ends of the cross bar are fixed on the inner wall surface of the second base shell.

[0013] Further, one end of the screen group is connected to a vibration motor.

[0014] Further, a sedimentation tank is provided below the discharge port. A plurality of partition plates in the sedimentation tank divide the space inside the tank into a plurality of different sedimentation tanks, and each sedimentation tank is correspondingly arranged below each discharge port one by one.

[0015] Further, one end of the sedimentation tank is connected to a drainage pipeline, and the other end of the drainage pipeline is connected to the box body. A water pump is installed in the drainage pipeline.

[0016] Further, a second discharge port is further provided at the bottom side of the second base shell. A conveying device is installed at the second discharge port. The conveying device includes a feeding pipeline: the second discharge port is connected to one end of the feeding pipeline, the other end of the feeding pipeline is connected to a vertical transportation pipeline, an auger is provided inside the transportation pipeline, a third motor is provided at the bottom end of the transportation pipeline, the driving shaft of the third motor is connected to the auger, the top end of the transportation pipeline is connected to a material passing pipeline, and the material passing pipeline is communicated with a second feeding port at the top of the second base shell.

[0017] Further, the first sieve plate and the second sieve plate are parallel to each other and inclined.

[0018] The present application also provides a preparation method of a demulsifier, and the method includes the following steps:

[0019] Dissolve coconut amine polyoxyethylene ether and sodium dodecyl sulfate in ethylene glycol according to a mass ratio of 1:1, stir and mix evenly to obtain a mixed solution A; the total mass ratio of coconut amine polyoxyethylene ether and sodium dodecyl sulfate to ethylene glycol is 1:1 to 3.2.

[0020] After mixing 0.5 mol / L sodium carbonate with rhamnolipid (R1), and waiting for the rhamnolipid to completely dissolve, transfer the solution into the mixed solution A to form a mixed solution B; the mass ratio of the sodium carbonate solution to the rhamnolipid is (10 - 20):1.

[0021] Drop white oil into the solution of the mixed solution B, and the addition amount of the white oil accounts for 2% - 4.5% of the total mass.

[0022] Technical effects and advantages of the present application:

[0023] The present application conducts multi-stage treatment on oil-containing drill cuttings, effectively improving the treatment effect on oil-containing drill cuttings.

[0024] Other features and advantages of the present application will be described in the subsequent specification, and in part, will become apparent from the specification, or will be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures pointed out in the specification and the drawings. Description of the Drawings

[0025] Figure 1 Shows a structural schematic diagram of an oil-containing drill cuttings treatment device of the present application;

[0026] In the figure: 1 - feed pipeline, 2 - feed cavity, 3 - ultrasonic horn, 4 - first matrix housing, 5 - separation tube body, 6 - stirring blade, 7 - stirring shaft, 8 - first motor, 9 - first discharge pipeline, 10 - oil-water discharge pipeline, 11 - second matrix housing, 12 - second motor, 13 - transmission shaft, 14 - upper bracket, 15 - first gear set, 16 - second gear set, 17-1 - first rotating shaft, 17-2 - second rotating shaft, 18-1 - first roller, 18-2 - second roller, 19 - cross bar, 20 - first sieve plate, 21 - second sieve plate, 22 - feeding pipeline, 23 - transportation pipeline, 24 - auger, 25 - third motor, 26 - material passing pipeline, 27 - second discharge pipeline, 28 - feeding hopper, 29 - box body, 30 - screen mesh, 31 - vibration motor, 32 - telescopic rod, 33 - first discharge port, 34 - second discharge port, 35 - third discharge port, 36 - fourth discharge port, 37 - sedimentation tank, 38 - first partition board, 39 - second partition board, 40 - third partition board, 41 - drainage pipeline, 42 - water pump, 43 - water delivery pipeline, 44 - spray head. Detailed implementation manner

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0028] In addition, in the invention, the terms "first", "second" and other similar terms do not imply any order, quantity and importance, but are only used to distinguish different elements. The terms "upper", "lower", "left", "right" and other similar terms are only the positional relationships in the drawings.

[0029] As Figure 1 shown, the embodiment of the present application provides an oil-containing drill cuttings treatment device, including: an oil centrifuge, a grinder and a particle size sieve, wherein:

[0030] The oil centrifuge includes a first base housing 4. A vertical separation tube 5 is arranged inside the first base housing 4, and the side wall surface of the separation tube 5 is wrapped by a filter net. Outside the bottom of the first base housing 4, there is a feed cavity 2. The bottom of the separation tube 5 communicates with the feed cavity 2. The feed cavity 2 is connected to a feed pipe 1, and an ultrasonic horn 3 is inserted inside the feed cavity 2. The ultrasonic horn 3 is controlled by an external ultrasonic generator. The top of the separation tube 5 extends outside the first base housing 4, and a discharge port is arranged on the circumferential surface of the separation tube 5. The discharge port is connected to the feed port of a grinder through a first discharge pipe 9. A stirring device is arranged inside the separation tube 5, and solid-liquid separation is carried out by the centrifugal force of the stirring device.

[0031] The mixed liquid after the oil-containing drill cuttings to be treated are mixed with the demulsifier enters the feed cavity 2 from the feed pipe 1. The mixed liquid is ultrasonically treated by the ultrasonic horn 3. The ultrasonic working frequency range is 20 - 25KHZ, which promotes the dispersion of the oil-containing drill cuttings in the solution. Then, solid-liquid separation is carried out by the centrifugal force generated by the stirring of the stirring device in the separation tube 5. The separated liquid phase is an oil-water mixture, and the oil-water mixture is discharged from the drain port 10. The separated solid-phase drill cuttings are transported to the grinder through the first discharge pipe 9 for subsequent grinding. The oil centrifuge can reduce the oil content rate of the oil-containing drill cuttings to less than 5%.

[0032] The grinder includes a second base housing 11. Inside the second base housing 11, two rotating rollers are inclinedly arranged, namely a first rotating roller 18-1 and a second rotating roller 18-2. Cutting blades are uniformly fixed on the surfaces of the rotating rollers, and the cutting blades gradually become smaller from top to bottom along the rotating rollers. The cross-section of the second base housing 11 is elliptical, and the size of the housing 11 gradually decreases from top to bottom. An upper bracket 14 is fixed on the second base upper housing 11, and a second motor 12 is fixed on the bolt on the right side of the upper bracket 14. An upper bracket 14 is fixed above the outside of the second base housing 11, and a second motor 12 is fixed by a bolt on the right side of the upper bracket. The power output end of the second motor 12 is connected to a transmission shaft 13. Two gear sets that can move along the transmission shaft are arranged on the transmission shaft 13, namely a first gear set 15 and a second gear set 16. The first gear set 15 is connected to a first rotating shaft 17-1, and the second gear set 16 is connected to a second rotating shaft 18-2. The first rotating roller 18-1 is sleeved and fixed on the first rotating shaft 17-1, and the first rotating shaft 17-1 penetrates through a through hole located at the center of the first rotating roller 18-1. The second rotating roller 18-2 is sleeved and fixed on the second rotating shaft 17-2, and the second rotating shaft 18-2 penetrates through a through hole located at the center of the second rotating roller 18-2. The ends of the two rotating shafts are rotatably installed on a cross bar 19, and both ends of the cross bar 19 are fixed on the inner wall surface of the second base housing 11. By adjusting the distance between the first gear set 15 and the second gear set 16, the inclination angles of the first rotating roller 18-1 and the first rotating roller 18-2 are controlled, and further the distance between the rotating rollers and the inner wall surface of the second base housing 11 is adjusted. On the opposite sides at the top of the second base housing 11, a first feed inlet and a second feed inlet are respectively arranged. The first feed inlet is connected to a first discharge pipeline 9. At the inner bottom of the second base housing 11, a first sieve plate 20 and a second sieve plate 21 are overlapped and placed. The first sieve plate 20 is located above the second sieve plate 21. The aperture sizes of the two sieve plates are the same, and different mesh aperture sizes are formed by the way of staggered placement. A first discharge port is arranged below the second sieve plate 21, and the first discharge port is connected to the feed inlet of a particle size screening device through a second discharge pipeline 27. A second discharge port is also arranged on the side at the bottom of the second base housing 11, and the materials discharged from the second discharge port are returned to the inside of the second base housing through a conveying device for re-grinding.

[0033] The rotating rollers of the grinder are inclined and placed in contact with the inner wall of the second base. After the cutting blades cut and grind the drill cuttings, the drill cuttings that meet the particle size requirements pass through the first sieve plate 20 and the second sieve plate 21 and enter the particle size screening device. The drill cuttings that do not pass through the second sieve plate 21 do not meet the particle size standard, and then enter the feeding pipeline (22), and after passing through the auger 24 and the material passing pipeline 26, they enter the grinder again for grinding. It is controlled that the particle size of the drill cuttings after grinding is ≤300μm.

[0034] The particle size sieve includes a box body 29 which is inclined to guide the material flow. Above the top of the box body 29, a feeding funnel 28 is arranged, and the feeding funnel 28 is connected to the second discharge pipeline 27. A spray head 44 is arranged on the inner top side surface of the box body 29. Inside the box body 29, a screen group 30 with the same inclination as the box body is provided. The top end of the screen group 30 is located directly below the feeding funnel 28. The screen holes from the top end to the end of the screen group 30 are designed as 140 mesh, 70 mesh, and 50 mesh in sequence to realize the screening of particles with different particle sizes. The screen group 30 is controlled to vibrate by a vibration motor 31. Specifically, the power output end of the vibration motor 31 is connected to a telescopic rod 32, and the other end of the telescopic rod is connected to the screen group 30. The vibration motor 31 drives the screen group 30 to vibrate. Below the box body 29, discharge ports for particles with different particle sizes are respectively arranged. There are a total of four discharge ports, namely the first discharge port 33, the second discharge port 34, the third discharge port 35, and the fourth discharge port 36. Below the discharge ports, a sedimentation tank 37 is arranged. Inside the sedimentation tank 37, the space in the tank is divided into four different sedimentation tanks by a first partition plate 38, a second partition plate 39, and a third partition plate 40. Each sedimentation tank corresponds to a discharge port, and the solid-liquid mixture discharged from the discharge port enters the corresponding sedimentation tank for sedimentation. The wastewater in the sedimentation tank is transported to the spray head 44 through a drainage pipeline 41, a water pump 42, and a hydrophobic pipeline 43, and the spray head 44 sprays the wastewater to wash the drill cuttings. The particle size sieve separates drill cuttings particles with different particle sizes, and drill cuttings particles of a certain particle size can be selected for reinjection into the formation according to requirements.

[0035] The particle size sieve flushes the oil-bearing drill cuttings through the spray head 44. The drill cuttings move from the upper end to the lower end of the vibrating screen 30 along with the water flow. From top to bottom of the screen, the aperture of the mesh gradually increases. The vibration motor 31 vibrates the vibrating screen to accelerate drill cuttings with different particle sizes to pass through the screen and enter the sedimentation tank 37. The drill cuttings that do not pass through the screen enter the sedimentation tank 37 through the fourth discharge port 36. The sedimentation tank 37 separates the oil-bearing drill cuttings into three particle size ranges of 0 - 100μm, 100 - 200μm, and 200 - 300μm sedimentation tanks through partition plates. At the same time, there are holes on the partition plates to facilitate the flow of wastewater. The wastewater is reused to wash the drill cuttings through the water pump 42 to realize the recycling of wastewater. The finally obtained drill cuttings can be reinjected back into the formation according to requirements.

[0036] In an embodiment of the present application, the stirring device includes a stirring shaft 7, and stirring blades 6 are arranged on the stirring shaft. The top of the stirring shaft 7 is connected to a first motor 8 above the outside of the separation tube body 5. At the bottom of the first base shell 4, a liquid discharge port 10 is further arranged for discharging oil and water.

[0037] In one embodiment of the present application, the conveying device is a screw conveyor. The specific structural composition of the screw conveyor is as follows: The second discharge port is connected to the feeding pipeline 22, the other end of the feeding pipeline 22 is connected to the vertical transportation pipeline 23, a screw 24 is arranged inside the transportation pipeline 23, a third motor 25 is arranged at the bottom end of the transportation pipeline 23, and the driving shaft of the third motor 25 is connected to the screw 24 to drive the screw 24 to rotate. The top end of the transportation pipeline 23 is connected to the material passing pipeline 26, and the material passing pipeline 26 communicates with the second feeding port at the top of the second base shell 11.

[0038] In one embodiment of the present application, the first sieve plate 20 and the second sieve plate 21 are parallel to each other and are inclined. The inclined downward end of the sieve plate communicates with the second discharge port, which is beneficial for guiding the flow so that the materials that have not passed through the sieve plate are discharged from the second discharge port.

[0039] When using the above-mentioned oil-containing drill cuttings treatment device to treat oil-containing drill cuttings, the materials entering the feeding cavity of the oil thrower are a mixture of oil-containing drill cuttings and demulsified liquid. The demulsified liquid is an aqueous solution containing a demulsifier, and the demulsifier is a microemulsion prepared from component A, component B, component C, sodium carbonate, rhamnolipid, and white oil; component A is coconut amine polyoxyethylene ether or octadecylamine polyoxyethylene ether, component B is sodium dodecyl sulfate or sodium dodecyl sulfonate, component C is propanol or ethylene glycol; the mass ratio of the demulsified liquid to the oil-containing drill cuttings is (1.5 - 5):1.

[0040] The embodiment of the present application provides a preparation method of a demulsifier, and the steps are as follows:

[0041] S1. Dissolve coconut amine polyoxyethylene ether and sodium dodecyl sulfonate in ethylene glycol according to a mass ratio of 1:1, and stir and mix evenly; the total mass ratio of coconut amine polyoxyethylene ether and sodium dodecyl sulfonate to ethylene glycol is 1:1 - 3.2.

[0042] S2. Mix 0.5 mol / L sodium carbonate with rhamnolipid (R1), and after the rhamnolipid is completely dissolved, transfer the solution into step S1 to form a transparent solution; the mass ratio of the sodium carbonate solution to the rhamnolipid is (10 - 20):1.

[0043] S3. Drop white oil into the solution in step S2 under stirring to prepare a microemulsion, that is, obtain the demulsifier. The addition amount of white oil accounts for 2% - 4.5% of the total mass.

[0044] The prepared demulsifier is used in the following Examples 1 - 4.

[0045] Example 1

[0046] The mass ratio of oil - containing drill cuttings to demulsifier is 5:1. The demulsifier and water are mixed at a mass ratio of 1:20 to obtain a demulsified liquid. After the oil - containing drill cuttings treated by the drilling platform are mixed with the demulsified liquid, they enter the feeding cavity 2 through the feeding pipeline (1), and are ultrasonically treated for 10 minutes by the ultrasonic horn 3 with an ultrasonic frequency of 20KHZ. The first motor 8 (the rotational speed of the first motor is 500r / min) drives the stirring shaft 7, which further drives the stirring blade 8. Centrifugal force is generated through high - speed stirring to separate the solid - liquid of the oil - containing drill cuttings. The oil and water pass through the separation pipe body 5 and are discharged from the oil - water discharge pipeline 10. The drill cuttings rise along the separation pipe body 5 and enter the grinder through the first discharge pipeline 9. The oil - containing drill cuttings are ground between the first roller (18 - 1) and the second roller (18 - 2), and the particle size becomes smaller. The drill cuttings with a smaller particle size pass through the first sieve plate 20 and the second sieve plate 21 and enter the second discharge pipeline 27. The drill cuttings that do not pass through the sieve plate enter the feeding pipeline 22. The third motor 25 drives the auger 24 to transport the drill cuttings through the transportation pipeline 23 to the feeding pipeline 26 and enter the grinder again for grinding. The pore sizes of the first sieve plate and the second sieve plate are both 50 mesh, and the two sieve plates are arranged in a staggered manner. The drill cuttings in the second discharge pipeline 27 enter the feeding funnel 28, and then after being rinsed and dispersed by the nozzle 44, they enter the vibrating box 29. The vibrating motor 31 drives the screen to vibrate. The oil - containing drill cuttings move from top to bottom under the filter screen. The qualified drill cuttings pass through the screens with 140 mesh, 70 mesh, and 50 mesh in sequence and enter the corresponding sedimentation tanks in the sedimentation pond. The unqualified drill cuttings directly enter the sedimentation pond from the fourth discharge port 36. The four sedimentation tanks in the sedimentation pond correspond to particle sizes of <100μm, 100 - 200μm, 200 - 300μm, and >300μm respectively. The wastewater in the sedimentation pond, under the action of the water pump 42, passes through the drainage pipeline 41, the water delivery pipeline 42, and the nozzle 44 in sequence to wash the drill cuttings, and the water speed of the nozzle is 10L / min, realizing the reuse of wastewater. Different - sized treated drill - cutting particles are obtained in the four sedimentation tanks, which is convenient for subsequent reinjection into the formation according to needs.

[0047] After sedimentation in the sedimentation pond, the proportion of the separated drill cuttings with a particle size of <100μm is 54%, the proportion of 100 - 200μm is 12%, the proportion of 200 - 300μm is 8%, and the proportion of >300μm is 26%.

[0048] Example 2

[0049] The difference between this example and Example 1 is that the ratio of oil - containing drill cuttings to demulsifier is 1.5:1, the rotational speed of the first motor is 500r / min, the ultrasonic frequency is 20KHZ, the pore sizes of the first sieve plate and the second sieve plate are 50 mesh, and the water speed of the nozzle is 10L / min.

[0050] After sedimentation in the sedimentation tank, the proportion of the separated drill cuttings with a particle size < 100 μm is 32%, the proportion of 100 - 200 μm is 29%, the proportion of 200 - 300 μm is 35%, and the proportion of > 300 μm is 4%.

[0051] Example 3

[0052] The difference between this example and Example 1 is that the ratio of oil - containing drill cuttings to demulsifier is 2:1, the rotational speed of the first motor is 600 r / min, the ultrasonic frequency is 25 KHZ, the pore sizes of the first sieve plate and the second sieve plate are 70 mesh, and the water speed of the nozzle is 10 L / min.

[0053] After sedimentation in the sedimentation tank, the proportion of the separated drill cuttings with a particle size < 100 μm is 24%, the proportion of 100 - 200 μm is 44%, the proportion of 200 - 300 μm is 29%, and the proportion of > 300 μm is 3%.

[0054] Example 4

[0055] The difference between this example and Example 1 is that the ratio of oil - containing drill cuttings to demulsifier is 2.0:1, the rotational speed of the first motor is 600 r / min, the ultrasonic frequency is 25 KHZ, the pore sizes of the first sieve plate and the second sieve plate are 140 mesh, and the water speed of the nozzle is 10 L / min.

[0056] After sedimentation in the sedimentation tank, the proportion of the separated drill cuttings with a particle size < 100 μm is 12%, the proportion of 100 - 200 μm is 21%, the proportion of 200 - 300 μm is 66, and the proportion of > 300 μm is 1%.

[0057] Finally, it should be noted that the above - mentioned are only the preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An oil - containing drill cuttings treatment device, characterized in that, Including: An oil slinger, a grinder, and a particle size sieve, where the oil slinger includes a first base housing (4), a vertical separation tube body (5) is arranged inside the first base housing (4), and the side wall surface of the separation tube body (5) is wrapped by a filter net; a feed cavity (2) is arranged outside the bottom of the first base housing (4), the bottom of the separation tube body (5) is communicated with the feed cavity (2), and the feed cavity (2) is connected to a feed pipe (1); the top of the separation tube body (5) extends outside the first base housing (4), and a discharge port is arranged on the circumferential surface of the separation tube body (5), and the discharge port is connected to the feed port of the grinder through a first discharge pipe (9); a stirring device is arranged inside the separation tube body (5); the grinder includes a second base housing (11), a first roller (18-1) and a second roller (18-2) are arranged obliquely inside the second base housing (11), cutting blades are uniformly fixed on the surfaces of the first roller (18-1) and the second roller (18-2), and the cutting blades gradually become smaller from top to bottom along the roller; the cross section of the second base housing (11) is oval, and the size of the housing (11) gradually decreases from top to bottom, and the top of the second base housing (11) is connected to the first discharge pipe (9); a first sieve plate (20) and a second sieve plate (21) are arranged overlappingly at the bottom inside the second base housing (11), the first sieve plate (20) is located above the second sieve plate (21), and the pore sizes of the two sieve plates are the same, and different mesh pore sizes are formed by the way of staggered placement; a first discharge port is arranged below the second sieve plate (21), and the first discharge port is connected to the feed port of the particle size sieve through a second discharge pipe (27); the particle size sieve includes a box body (29), the box body (29) is arranged obliquely, a feeding funnel (28) is arranged above the top of the box body (29), the feeding funnel (28) is connected to the second discharge pipe (27), a spray head (44) is arranged on the inner top side surface of the box body (29), a sieve mesh group (30) with the same inclination as the box body is arranged inside the box body (29), the sieve mesh group (30) is composed of a plurality of sieve meshes with different mesh numbers spliced in turn according to the mesh number from high to low, the number of the discharge ports is the same as the number of the sieve meshes, and the discharge ports are arranged below the sieve meshes (30) one by one.

2. The oil - containing drill cuttings treatment device according to claim 1, characterized in that, The stirring device includes a stirring shaft (7), stirring blades (6) are arranged on the stirring shaft, the top of the stirring shaft (7) is connected to a first motor (8) above the outside of the separation tube body (5); a liquid discharge port (10) is also arranged at the bottom of the first base housing (4) for discharging oil and water.

3. The oil - containing drill cuttings treatment device according to claim 1, characterized in that, An ultrasonic horn (3) is inserted inside the feed cavity (2).

4. The oil - containing drill cuttings treatment device according to claim 1, characterized in that, Above the outside of the second base housing (11), an upper support (14) is fixed. On the right side of the upper support (14), a second motor (12) is fixedly installed by bolts. The power output end of the second motor (12) is connected to a transmission shaft (13). Two sets of first gear sets (15) and second gear sets (16) that can move along the transmission shaft are arranged on the transmission shaft (13); the first gear set (15) is connected to a first rotating shaft (17-1), and the second gear set (16) is connected to a second rotating shaft (18-2); a first rotating roller (18-1) is sleeved and fixed on the first rotating shaft (17-1), and the first rotating shaft (17-1) penetrates through a through hole located at the center of the first rotating roller (18-1); a second rotating roller (18-2) is sleeved and fixed on the second rotating shaft (17-2), and the second rotating shaft (18-2) penetrates through a through hole located at the center of the second rotating roller (18-2); the ends of the two rotating shafts are rotatably installed on a cross bar (19), and both ends of the cross bar (19) are fixed on the inner wall surface of the second base housing (11).

5. The oil - containing drill cuttings treatment device according to claim 1, characterized in that, One end of the screen group (30) is connected to a vibration motor (31).

6. The oil - containing drill cuttings treatment device according to claim 1, characterized in that, Below the discharge port, a sedimentation tank (37) is provided. A plurality of partition plates in the sedimentation tank (37) divide the space in the tank into a plurality of different sedimentation tanks, and each sedimentation tank is correspondingly arranged below each discharge port.

7. The oil - containing drill cuttings treatment device according to claim 1, characterized in that, One end of the sedimentation tank (37) is connected to a drainage pipe (41), and the other end of the drainage pipe (41) is connected to a box body (29). A water pump (42) is installed in the drainage pipe (41).

8. The oil - containing drill cuttings treatment device according to claim 1, characterized in that, On the side of the bottom of the second base housing (11), a second discharge port is further provided. A conveying device is installed at the second discharge port. The conveying device includes a feeding pipe (22): one end of the second discharge port is connected to the feeding pipe (22), the other end of the feeding pipe (22) is connected to a vertical transportation pipe (23), an auger (24) is arranged in the transportation pipe (23), a third motor (25) is arranged at the bottom end of the transportation pipe (23), the drive shaft of the third motor (25) is connected to the auger (24), the top end of the transportation pipe (23) is connected to a feeding pipe (26), and the feeding pipe (26) is communicated with a second feeding port at the top of the second base housing (11).

9. The oil - containing drill cuttings treatment device according to claim 1, characterized in that, The first sieve plate (20) and the second sieve plate (21) are parallel to each other and are inclined.

10. A preparation method of a demulsifier, characterized in that, The method includes the following steps: Dissolve coconut amine polyoxyethylene ether and sodium dodecyl sulfate in ethylene glycol according to a mass ratio of 1:1, stir and mix evenly to obtain a mixed solution A; the total mass ratio of coconut amine polyoxyethylene ether and sodium dodecyl sulfate to ethylene glycol is 1:1 to 3.

2. After mixing 0.5 mol / L sodium carbonate with rhamnolipid (R1), and waiting for the rhamnolipid to be completely dissolved, transfer the solution into the mixed solution A to form a mixed solution B; the mass ratio of the sodium carbonate solution to the rhamnolipid is (10 to 20):

1. Drop white oil into the solution of the mixed solution B, and the addition amount of white oil accounts for 2% to 4.5% of the total mass.

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