An oilfield oily sludge treatment device

Abstract

The present invention relates to the technical field of oilfield sludge purification, and in particular to an oilfield oily sludge treatment device. In view of the problem that in the existing three-phase separation technology, the stirring rod promotes the separation of oil and sediment, while also causing part of the oil and sediment to mix with each other. It includes: a support frame, the support frame is fixedly connected to a separation barrel and a motor, and the output shaft of the motor is fixedly connected to a stirring rod; a first stirring blade, which has a plurality of blades, which are staggered and longitudinally spaced and arranged on the upper part of the stirring rod; a first guide ring, which is fixedly connected to the stirring rod; and a second guide ring, which is arranged in the separation barrel. The present invention guides the surrounding water flow through the first guide ring and the second guide ring. After the oily sludge is treated for a certain period of time, the liquids on the upper and lower sides of the separation barrel are circulated up and down respectively, and the sediment and oil are confined to different cycles, thereby improving the separation efficiency of the oil and sediment and reducing the probability of the two mixing with each other again.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield sludge purification, in particular to an oilfield oily sludge treatment device. Background Art

[0002] Oily sludge is an environmental pollutant that is inevitably produced during the oil extraction process. It is mainly composed of mud and sand sediment carried by the crude oil during the extraction process or pollutants formed when the crude oil accidentally falls to the ground and mixes with soil and debris during the extraction process. Due to its great toxicity and corrosiveness, the treatment of oily sludge is a top priority in the oil field extraction process.

[0003] In the prior art, when treating oily sludge, the oily sludge and excess water are usually mixed together first, and then demulsifiers and other agents are added to the mixed liquid, and the oily sludge is treated using a three-phase separation technology. After the liquid and the agent are fully stirred, the liquid is allowed to stand to gradually separate the oil and mud in the liquid in the water, and finally the oil, water and mud are separated and collected. In the prior art, only a stirring rod is used to increase the mixing speed of the liquid and the agent, which works well at the beginning of the treatment of the oily sludge and can quickly break the gap between the oil and water. The emulsified state and the bonding state between the oil and the mud and sand, but after the processing time increases, the stirring rod will promote the separation of the oil and mud in the liquid, while also promoting the mixing of part of the oil and mud, causing part of the oil to be mixed into the mud again, and the separation effect between the oil and the mud and sand gradually decreases, resulting in a small amount of oil still wrapped in the mud and sand during the sedimentation process. The oil content of the mud and sand does not meet the environmental emission standards, resulting in the need for cumbersome subsequent treatment of the mud and sand to reduce the oil content before it can be discharged, resulting in low efficiency of mud and sand discharge treatment. Summary of the invention

[0004] In order to overcome the disadvantage of the existing three-phase separation technology that the stirring rod promotes the separation of oil and sediment while also causing some oil and sediment to mix with each other, the present invention provides an oilfield oily sludge treatment device.

[0005] The technical solution is: an oilfield oily sludge treatment device, including:

[0006] A support frame, wherein the support frame is fixedly connected to a separation barrel and a motor, an output shaft of the motor is fixedly connected to a stirring rod, and the stirring rod is located in the separation barrel;

[0007] A plurality of first stirring blades are staggered and longitudinally spaced on the upper portion of the stirring rod;

[0008] A plurality of second stirring blades are staggered and longitudinally spaced at the lower portion of the stirring rod;

[0009] A first guide ring, fixedly connected to the stirring rod, wherein the first guide ring is located between all the first stirring blades and all the second stirring blades;

[0010] a second guide ring, disposed in the separation barrel, the second guide ring and the first guide ring being located on the same horizontal plane, the first guide ring and the second guide ring both being used to guide adjacent water flows;

[0011] A spraying mechanism, arranged on the second guide ring, for adding a sludge treatment agent into the separation barrel;

[0012] The auxiliary stirring mechanism is arranged on the second stirring blade at the lowermost side and is used to promote the circulation of sediment settled at the bottom.

[0013] As a further preferred embodiment, the inclination direction of the first stirring blade is opposite to the inclination direction of the second stirring blade.

[0014] As a further preferred embodiment, the maximum size of the lowermost first stirring blade is smaller than the maximum size of the other first stirring blades, and the maximum size of the uppermost second stirring blade is smaller than the maximum size of the other second stirring blades.

[0015] As a further preferred embodiment, the blade inclination angle of the first stirring blade located in the middle among all the first stirring blades is greater than the blade inclination angles of the other first stirring blades, and the blade inclination angle of the second stirring blade located in the middle among all the second stirring blades is greater than the blade inclination angles of the other second stirring blades.

[0016] As a further preferred embodiment, the spraying mechanism includes:

[0017] A plurality of micro-sprinklers are circumferentially spaced and arranged at upper and lower sides of the second guide ring, wherein a liquid guide cavity connected to all the micro-sprinklers is arranged in the second guide ring;

[0018] There are several sliding tubes, which are fixedly connected to the second guide ring at circumferential intervals. The lower side of the sliding tube is connected to the liquid guide cavity on the second guide ring, and the upper side of the sliding tube is connected to the external medicine storage barrel. The separation barrel is fixed with a fixing ring, and the fixing ring is slidably connected to the sliding tube.

[0019] As a further preferred embodiment, the auxiliary stirring mechanism includes:

[0020] An auxiliary stirring ring, arranged on the second stirring blade at the lowermost side;

[0021] A plurality of external stirring blades are arranged at circumferential intervals on the outer side of the auxiliary stirring ring;

[0022] There are a plurality of inner stirring blades which are arranged at intervals in the circumferential direction on the inner side of the auxiliary stirring ring.

[0023] As a further preferred embodiment, the blade inclination direction of the outer stirring blade is opposite to the blade inclination direction of the inner stirring blade, and the blade inclination direction of the inner stirring blade is the same as the blade inclination direction of the second stirring blade.

[0024] As a further preferred solution, it also includes:

[0025] A stirring enhancement mechanism is provided on the auxiliary stirring ring, and is used to enhance the stirring effect of the auxiliary stirring ring on the surrounding liquid when the auxiliary stirring ring is located in the middle of the separation barrel. The stirring enhancement mechanism includes:

[0026] The number of fixed cylinders is the same as that of the inner stirring blades, and they are respectively fixed in the adjacent inner stirring blades. The inner stirring blades are slidably connected with fixed blocks and rotating stirring blades. The fixed blocks are rotatably connected with the adjacent rotating stirring blades. The rotating stirring blades are fixed with rotating piston rods, and the rotating piston rods are slidably connected with the adjacent fixed cylinders.

[0027] A connecting member is rotatably connected to the auxiliary stirring ring, the connecting member is slidably connected to a plurality of fixing rods arranged at intervals in the circumferential direction, the fixing rods are fixedly connected to the second guide ring, the second guide ring is slidably connected to the separation barrel, and the second guide ring is extrusion-fitted with the fixing ring;

[0028] An electric winch is fixedly connected to the support frame, the electric winch is fixedly connected to the connecting member via a steel strand, and the auxiliary stirring ring is slidably connected to the adjacent second stirring blade;

[0029] The extrusion ring is slidably connected in the connecting piece, and an elastic piece is fixedly connected between the two. The fixing rod is fixedly connected to the extrusion ring. The auxiliary stirring ring, the connecting piece and the extrusion ring together form an air storage chamber. The fixing cylinder is connected to the air storage chamber.

[0030] As a further preferred solution, a groove is provided on the rotating piston rod, and the groove consists of a straight groove and an inclined groove, and a limit block is fixedly connected to the fixed cylinder and is pressed and matched with the groove on the rotating piston rod.

[0031] As a further preferred solution, the volume of the air storage chamber is greater than the sum of the volumes of all the fixed cylinders.

[0032] The present invention has the following advantages: the present invention guides the surrounding water flow through the first guide ring and the second guide ring, and after the oily sludge is treated for a certain period of time, the liquid on the upper and lower sides of the separation barrel are circulated up and down respectively, and the mud and oil are confined to different cycles, thereby improving the separation efficiency of the oil and mud and reducing the probability of the two mixing with each other again.

[0033] The present invention promotes the liquid in the separation barrel to form different upper and lower circulation flow paths through the special setting of the first stirring blade and the second stirring blade, effectively reducing the probability of oil and mud sticking together again under the action of the violent flow of the surrounding liquid.

[0034] The present invention increases the efficiency of oil discharge in the sediment by adding auxiliary stirring rings, inner stirring blades and rotating stirring blades, thereby respectively improving the effect of the first stirring blade and the second stirring blade in mixing liquid and liquid medicine in the first stage of oily sludge treatment and the effect of the first stirring blade and the second stirring blade in turning over sediment in the second stage of oily sludge treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0036] Figure 2 It is a schematic diagram of the three-dimensional structure of the support frame, the separation barrel and the first stirring blade of the present invention;

[0037] Figure 3 It is a schematic diagram of the three-dimensional structure of the separation barrel, the first stirring blade and the second stirring blade of the present invention;

[0038] Figure 4 It is a schematic diagram of the three-dimensional structure of the stirring rod, the first stirring blade and the second stirring blade of the present invention;

[0039] Figure 5 It is a schematic diagram of the three-dimensional structure of the separation barrel, the second guide ring and the connecting piece of the present invention;

[0040] Figure 6 It is a schematic diagram of the three-dimensional structure of the second guide ring, the sliding tube and the fixing rod of the present invention;

[0041] Figure 7 It is a three-dimensional structural schematic diagram of the connecting piece, the fixing rod and the extrusion ring of the present invention;

[0042] Figure 8 It is a cross-sectional view of the auxiliary stirring ring, the connecting piece and the extrusion ring of the present invention;

[0043] Fig. 9 It is a cross-sectional view of the fixed cylinder, the fixed block and the rotating stirring blade of the present invention;

[0044] Fig.10 It is a schematic diagram of the three-dimensional structure of the rotating stirring blade of the present invention after rotation.

[0045] Wherein: 1-support frame, 101-control terminal, 2-separation barrel, 3-motor, 4-stirring rod, 5-first stirring blade, 6-second stirring blade, 7-first guide ring, 8-second guide ring, 81-micro nozzle, 9-sliding tube, 10-fixing ring, 11-auxiliary stirring ring, 111-outer stirring blade, 112-inner stirring blade, 12-electric winch, 13-fixing cylinder, 131-limiting block, 14-fixing block, 15-rotating stirring blade, 16-rotating piston rod, 17-connecting piece, 18-fixing rod, 19-extrusion ring. DETAILED DESCRIPTION

[0046] The present invention is further described below in conjunction with specific embodiments. It should also be noted that, unless otherwise clearly specified and limited, terms such as "set" and "set" may refer to fixed connection, detachable connection, or integral connection; may refer to direct connection or indirect connection through an intermediate medium. Without violating the principles of the present invention, the connection relationship of some parts may vary in different embodiments. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0047] In the existing three-phase separation technology, the stirring rod is only used to increase the mixing speed of the liquid and the reagent, which works well in the initial stage of treating oily sludge and can quickly break the emulsified state between the oil and water and the bonding state between the oil and the mud and sand. However, after the treatment time increases, the stirring rod will promote the re-mixing of part of the oil and the mud and sand during the stirring process, causing part of the oil to be mixed into the mud and sand again, resulting in a small amount of oil still wrapped in the mud and sand that is finally discharged, and the oil content of the mud and sand does not meet the environmental emission standards.

[0048] An oilfield oily sludge treatment device, Figure 1-Figure 3 For example, it includes: a support frame 1, the support frame 1 is fixedly connected to a separation barrel 2 and a motor 3, the output shaft of the motor 3 is fixedly connected to a stirring rod 4, and the stirring rod 4 is located in the separation barrel 2; a first stirring blade 5, which has a plurality of blades, which are staggered and longitudinally spaced at the upper part of the stirring rod 4; a second stirring blade 6, which has a plurality of blades, which are staggered and longitudinally spaced at the lower part of the stirring rod 4; a first guide ring 7, which is fixed to the stirring rod 4, and the first guide ring 7 is located between all the first stirring blades 5 and all the second stirring blades 6; a second guide ring 8, which is arranged in the separation barrel 2, and the second guide ring 8 and the first guide ring 7 are located on the same horizontal plane, and the first guide ring 7 and the second guide ring 8 are both used to guide adjacent water flows; a spraying mechanism, which is arranged on the second guide ring 8, and is used to add sludge treatment agents into the separation barrel 2; an auxiliary stirring mechanism, which is arranged on the second stirring blade 6 at the lowermost side, and is used to promote the circulation of sediment that has settled to the bottom.

[0049] In the above scheme, a control terminal 101 is arranged on the support frame 1, and the control terminal 101 includes an electric control box, an operating table, a medicine storage barrel and a medicine pump for supplying medicine. The medicine used in this scheme is mainly a demulsifier, which is used to break the emulsification phenomenon that occurs during the mixing process of oil and water, thereby improving the separation effect between oil and water. The upper and lower sides of the first guide ring 7 and the second guide ring 8 are both gradually inclined arc surfaces (such as Figure 3 As shown), the inclined surfaces on the first guide ring 7 and the second guide ring 8 are respectively used to convert the adjacent liquids from a longitudinal flow state to a transverse flow state, or to convert the adjacent liquids from a transverse flow state to a longitudinal flow state, thereby dividing the water flow circulating in the separation barrel 2 into two upper and lower parts, all the first stirring blades 5 are located above the first guide ring 7 and the second guide ring 8, and are used to drive the liquid on the upper side of the first guide ring 7 and the second guide ring 8 to circulate up and down (the main components of the liquid here are water and oil, containing a small amount of solid particles), all the second stirring blades 6 are located below the first guide ring 7 and the second guide ring 8, and are used to drive the liquid on the lower side of the first guide ring 7 and the second guide ring 8 to circulate up and down (the main components of the liquid here are water and solid particles, as well as a small amount of oil mixed between gravel and soil), and the medicine storage barrel is connected to the spraying mechanism through a medicine pump.

[0050] The working process of this scheme is as follows: the staff introduces the oily sludge to be treated into the separation barrel 2 through the sludge pump, and adds water about four times the amount of sludge into the separation barrel 2. Then the staff starts the motor 3 and the drug pump through the control terminal 101. The drug pump pumps the liquid medicine in the storage barrel into the spraying mechanism. The spraying mechanism sprays the liquid medicine into the separation barrel 2. The motor 3 drives the stirring rod 4, the first stirring blade 5 and the second stirring blade 6 to rotate through the output shaft. At this time, the output shaft of the motor 3 drives the stirring rod 4, the first stirring blade 5 and the second stirring blade 6 to rotate rapidly, so that the first stirring blade 5 and the second stirring blade 6 push the surrounding liquid to surge rapidly, and promote the rapid mixing of the liquid and the liquid medicine. At this time, the liquid flow rate is relatively fast, and the first guide ring 7 and the second guide ring 8 have a poor effect in hindering the flow of liquid between the upper and lower sides. The first guide ring 7 and the second guide ring 8 will not excessively affect the effect of mixing the liquid and the liquid medicine.

[0051] After the motor 3 has been working for a certain period of time (at least 20 minutes), most of the oil, water and sediment in the liquid have become independent existence states (only mixed together under the stirring action of the stirring rod 4, the first stirring blade 5 and the second stirring blade 6). The staff turns off the drug extraction pump through the control terminal 101, and reduces the speed of the output shaft of the motor 3 through the control terminal 101. At this time, the speed of the stirring rod 4, the first stirring blade 5 and the second stirring blade 6 slows down, and the flow rate of the liquid around the first stirring blade 5 and the second stirring blade 6 slows down synchronously. The auxiliary stirring mechanism assists the second stirring blade 6 to stir the sediment at the bottom of the separation barrel 2, so that the sediment continues to flow with the water flow under low-speed stirring, promoting the separation of the sticky oil and sediment in the sediment. Figure 3 Take the liquid on the left side of stirring rod 4 as an example:

[0052] Assume that the stirring rod 4 rotates counterclockwise ( Figure 3 The liquid in the separation barrel 2 circulates counterclockwise ( Figure 3 From the perspective of front to back), at this time, the liquid flowing downward from the upper left side turns to flow horizontally toward the first guide ring 7 after contacting the second guide ring 8, and then the liquid turns to flow upward after contacting the first guide ring 7. This part of the liquid circulates counterclockwise on the upper side of the second guide ring 8 ( Figure 3 From the perspective of front to back), the liquid on the left side of the stirring rod 4 near it, in the process of upward flow, contacts the first guide ring 7, and finally turns to flow to the right, and then contacts the second guide ring 8 and turns to flow downward. At this time, this part of the liquid circulates counterclockwise on the lower side of the second guide ring 8 ( Figure 3 From the perspective of front to back), the liquids on both sides have an intersection surface only during the lateral flow. During the lateral flow of the solid materials in the upper liquid at the intersection surface, they are gradually transferred to the lower liquid under the action of gravity, while the oil droplets suspended in the lower liquid are gradually transferred to the upper liquid under the action of their own buoyancy during the lateral flow. At this time, because the rotation speed of the stirring rod 4 is slowed down, the flow rate of the liquids on the upper and lower sides is not enough to drive the oil floating on the water surface to circulate downward, and is also not enough to drive the sediment sunk in the water to circulate upward. Then, while continuing to stir and separate the oil and sediment, the sediment and oil are restricted to different cycles in advance, thereby improving the separation efficiency of the oil and sediment, and effectively reducing the probability of the oil and sediment following the violent flow of the surrounding liquid and sticking together again, which is also conducive to accelerating the subsequent sedimentation process of the sediment.

[0053] After the motor 3 continues to work for a certain period of time (at least 10 minutes), the staff turns off the motor 3 through the control terminal 101, and allows the liquid in the separation barrel 2 to stand and separate into layers. Then the staff uses existing devices such as sludge pumps to pump the oil, water and silt out to the storage location respectively. At this time, the oil content in the sludge is low and can meet the environmental protection standards. Even if the oily sludge with a high oil content is being processed, it can meet the environmental protection standards after simple subsequent treatment after the sludge is discharged, thereby greatly improving the efficiency of sludge discharge.

[0054] As a further preferred solution, Figure 4 For example, the inclination direction of the first stirring blade 5 is opposite to the inclination direction of the second stirring blade 6.

[0055] As a further preferred solution, Figure 4 For example, the maximum size of the lowermost first stirring blade 5 is smaller than the maximum size of other first stirring blades 5 , and the maximum size of the uppermost second stirring blade 6 is smaller than the maximum size of other second stirring blades 6 .

[0056] As a further preferred solution, Figure 4 For example, the blade inclination angle of the first stirring blade 5 located in the middle among all the first stirring blades 5 is greater than the blade inclination angles of the other first stirring blades 5, and the blade inclination angle of the second stirring blade 6 located in the middle among all the second stirring blades 6 is greater than the blade inclination angles of the other second stirring blades 6.

[0057] In the above scheme, by making the blade inclination direction of the first stirring blade 5 opposite to the blade inclination direction of the second stirring blade 6, the flow direction of the liquid around the first stirring blade 5 is opposite to the flow direction of the liquid around the second stirring blade 6. When the stirring rod 4 drives the first stirring blade 5 and the second stirring blade 6 to stir the liquid at a high speed, the liquids on the upper and lower sides of the separation barrel 2 flow in opposite directions to each other, thereby improving the mixing efficiency of the liquid and the liquid medicine. When the stirring rod 4 reduces the rotation speed, the first stirring blade 5 and the second stirring blade 6 still drive the surrounding liquids to flow in opposite directions respectively. At this time, the liquids on the upper and lower sides have the same lateral flow direction when guided by the first guide ring 7 and the second guide ring 8, thereby avoiding the water flows on both sides from colliding with each other to generate vortices, thereby promoting the smooth movement of oil and solid particles to the corresponding areas during the lateral flow; by reducing the first stirring rod 4 at the bottom The size of the blade 5 and the second stirring blade 6 on the uppermost side reduces the flow rate of the liquid near the intersection surface, thereby reducing the flow rate of the liquid flowing laterally, and promoting the smooth up and down movement of the oil and solid particles during the lateral flow; by increasing the blade inclination angles of the first stirring blade 5 in the middle and the second stirring blade 6 in the middle, the speed of the up and down flow of the liquid in the middle is accelerated, which is the main driving force for promoting the circulation of the surrounding liquid. At the same time, by reducing the blade inclination angles of the first stirring blade 5 at the lowermost side and the second stirring blade 6 at the lowermost side, while ensuring that the liquid on the upper and lower sides complete the entire circulation flow, the degree to which the surrounding oil and sediment are driven by the first stirring blade 5 at the uppermost side and the second stirring blade 6 at the lowermost side is reduced, thereby reducing the flow range of the upper oil and lower sediment under violent stirring, and reducing the probability of the upper oil and lower sediment entering the surrounding liquid circulation.

[0058] As a further preferred solution, Figure 3 , Figure 5 and Figure 6 For example, the spraying mechanism includes: a plurality of micro-sprinklers 81, which are circumferentially spaced apart on the upper and lower sides of the second guide ring 8, and a liquid guide cavity connected to all the micro-sprinklers 81 is provided in the second guide ring 8; a plurality of sliding tubes 9, which are fixedly connected to the second guide ring 8 at circumferential intervals, the lower side of the sliding tube 9 is connected to the liquid guide cavity on the second guide ring 8, the upper side of the sliding tube 9 is connected to an external medicine storage barrel, and the separation barrel 2 is fixedly connected to a fixing ring 10, which is slidably connected to the sliding tube 9.

[0059] In the above scheme, a one-way valve structure is provided in the micro nozzle 81, which can only spray the medicine liquid in the liquid guide cavity outward, and will not allow the external solution to enter the micro nozzle 81. The upper side of the sliding tube 9 is connected to the medicine storage barrel and the medicine extraction pump in the control terminal 101 through a hose (the hose is not shown in the figure). When the staff fills the material into the separation barrel 2, it is necessary to ensure that the total amount of liquid in the separation barrel 2 does not exceed the fixed ring 10 to avoid the liquid overflowing upward.

[0060] As a further preferred solution, Figure 2 , Figure 3 , Figure 5 and Figure 7 For example, the auxiliary stirring mechanism includes: an auxiliary stirring ring 11, which is arranged on the second stirring blade 6 at the lowermost side; an outer stirring blade 111, which has a plurality of blades and is circumferentially spaced apart on the outer side of the auxiliary stirring ring 11; and an inner stirring blade 112, which has a plurality of blades and is circumferentially spaced apart on the inner side of the auxiliary stirring ring 11.

[0061] As a further preferred solution, Figure 7 For example, the blade inclination direction of the outer stirring blade 111 is opposite to the blade inclination direction of the inner stirring blade 112 , and the blade inclination direction of the inner stirring blade 112 is the same as the blade inclination direction of the second stirring blade 6 .

[0062] In the above scheme, the second stirring blade 6 at the bottom drives the auxiliary stirring ring 11 to rotate, thereby improving its own effect of stirring the mud and sand. By making the blade inclination direction of the inner stirring blade 112 the same as the blade inclination direction of the second stirring blade 6, the two can cooperate with similar force to stir the mud and sand to make it surge, while reducing the degree to which the two disrupt the liquid circulation in the lower part of the separation barrel 2. By making the blade inclination direction of the outer stirring blade 111 opposite to the blade inclination direction of the second stirring blade 6, the outermost liquid is promoted to circulate along the inner wall of the separation barrel 2.

[0063] In all the above schemes, the second guide ring 8 is considered to be fixedly connected to the separation barrel 2, and the auxiliary stirring ring 11 and the second stirring blade 6 on the lower side are considered to be fixedly connected. In the following scheme, the second guide ring 8 is slidably connected to the separation barrel 2, and the second guide ring 8 can be moved to a maximum contact position with the fixed ring 10, and the auxiliary stirring ring 11 and the second stirring blade 6 on the lower side are slidably connected to each other via a support rod.

[0064] As a further preferred solution, Figure 6-Figure 10For example, it also includes: a stirring enhancement mechanism, which is arranged on the auxiliary stirring ring 11, and is used to enhance the stirring effect of the auxiliary stirring ring 11 on the surrounding liquid when it is located in the middle of the separation barrel 2. The stirring enhancement mechanism includes: a fixed cylinder 13, the number of which is the same as the number of the inner stirring blades 112, which are respectively fixed to the adjacent inner stirring blades 112, and the inner stirring blades 112 are slidably connected with a fixed block 14 and a rotating stirring blade 15, the fixed block 14 is rotatably connected to the adjacent rotating stirring blade 15, and the rotating stirring blade 15 is fixedly connected with a rotating piston rod 16, and the rotating piston rod 16 is slidably connected to the adjacent fixed cylinder 13; a connecting member 17, which is rotatably connected to the auxiliary stirring ring 11, The connecting piece 17 is slidably connected to a plurality of fixed rods 18 arranged at intervals in the circumferential direction, the fixed rod 18 is fixedly connected to the second guide ring 8, the second guide ring 8 is slidably connected to the separation barrel 2, and the second guide ring 8 is extruded and fitted with the fixed ring 10; the electric winch 12 is fixedly connected to the support frame 1, the electric winch 12 is fixedly connected to the connecting piece 17 through a steel wire rope, the auxiliary stirring ring 11 is slidably connected to the adjacent second stirring blade 6; the extrusion ring 19 is slidably connected in the connecting piece 17, and an elastic member is fixedly connected between the two, the fixed rod 18 is fixedly connected to the extrusion ring 19, the auxiliary stirring ring 11, the connecting piece 17 and the extrusion ring 19 together constitute an air storage chamber, and the fixed cylinder 13 is connected to the air storage chamber.

[0065] As a further preferred solution, a groove is provided on the rotating piston rod 16 , and the groove is composed of a straight groove and an inclined groove. A limit block 131 is fixed to the fixed cylinder 13 and is pressed and matched with the groove on the rotating piston rod 16 .

[0066] As a further preferred solution, the volume of the air storage chamber is greater than the sum of the volumes of all the fixed cylinders 13 .

[0067] In the above scheme, by adding a rotating stirring blade 15 to the inner stirring blade 112, the effect of the auxiliary stirring ring 11 stirring the liquid flow in the middle of the separation barrel 2 is enhanced. At the same time, when the auxiliary stirring ring 11 is located at the bottom of the separation barrel 2, the rotating stirring blade 15 is retracted into the inner stirring blade 112 to reduce the amplitude of the turbulence of the sediment when the auxiliary stirring ring 11 stirs the sediment, thereby reducing the probability of solid particles in the sediment breaking through the intersection surface in the middle of the separation barrel 2, and moving to the upper part of the separation barrel 2 to contact the oil again. The elastic member between the extrusion ring 19 and the connecting member 17 is a tension spring; the rotating stirring ring 11 is used for the auxiliary stirring ring 11. The blade 15 is detachably connected to the inner stirring blade 112 by sliding, and the length of the straight groove is greater than or equal to the length of the rotating stirring blade 15 inserted into the inner stirring blade 112. The rotating piston rod 16 passes through the fixed block 14 and is rotatably connected thereto; by ensuring that the volume of the gas storage chamber is greater than the sum of the volumes of all the fixed cylinders 13, it is ensured that when the gas in the gas storage chamber is completely discharged into the fixed cylinder 13, the rotating piston rod 16 moves to the limit position under the action of the gas pressure, and the rotating piston rod 16 will not be affected by the liquid resistance in the separation barrel 2 and retract inwardly, and a buffer is provided in the inner stirring blade 112 The side of the fixed cylinder 13 that is not connected to the gas storage chamber is connected to the buffer chamber, and the air pressure in the buffer chamber is lower than the air pressure in the gas storage chamber, which is used to reduce the resistance of the rotating piston rod 16 when it is pushed by the gas pressure to move out of the fixed cylinder 13; the second stirring blade 6 at the lowermost side is slidably connected to the auxiliary stirring ring 11 through a support rod, and the electric winch 12 is electrically connected to the control terminal 101. The electric winch 12 drives the connecting piece 17 and the auxiliary stirring ring 11 to move vertically by winding the steel strand. When the control terminal 101 controls the motor 3 to drive the stirring rod 4 to rotate at a faster speed, The electric winch 12 drives the connecting piece 17 and the auxiliary stirring ring 11 to move to the middle of the separation barrel 2 through the steel wire rope, and accelerates the stirring efficiency of the middle liquid through the auxiliary stirring ring 11, the outer stirring blade 111 and the inner stirring blade 112 to increase the mixing efficiency of the liquid and the medicine. When the motor 3 drives the stirring rod 4 to rotate at a slower speed, the electric winch 12 lowers the auxiliary stirring ring 11 to the bottom of the separation barrel 2, and then assists the second stirring blade 6 at the bottom to stir the mud and sand at the bottom of the separation barrel 2, so that the mud and sand at the bottom of the separation barrel 2 surge in a small range.

[0068] The working process of the above scheme is as follows: during the initial stirring of the liquid in the separation barrel 2, the staff controls the electric winch 12 to lift the connecting piece 17 and the auxiliary stirring ring 11 to the middle of the separation barrel 2 through the steel strand. During the movement of the connecting piece 17, the extrusion ring 19 and all the fixed rods 18 are driven upward by the elastic member, and the fixed rod 18 drives the second guide ring 8 to move upward together. When the second guide ring 8 contacts the fixed ring 10, the second guide ring 8 cannot move upward, and the electric winch 12 continues to drive the connecting piece 17 and the auxiliary stirring ring 11 to move upward. At this time, the second guide ring 8, the fixed rod 18 and the extrusion ring 19 are displaced relative to the connecting piece 17 and the auxiliary stirring ring 11, the elastic member on the connecting piece 17 is stretched and stored, and the extrusion ring 19 squeezes the gas in the gas storage chamber. The gas in the gas storage chamber flows into the fixed cylinder 13, rotating the piston rod 16 is pushed by the gas in the adjacent fixed cylinder 13 to move toward the adjacent fixed block 14, and drives the adjacent fixed block 14 and the adjacent rotating stirring blade 15 to extend outward from the adjacent inner stirring blade 112, and the gas on the other side of the fixed cylinder 13 flows into the buffer chamber. At this time, the limit block 131 slides along the straight groove on the adjacent rotating piston rod 16. When the limit block 131 contacts the inclined groove on the adjacent rotating piston rod 16, the rotating stirring blade 15 has completely protruded out of the adjacent inner stirring blade 112. The rotating piston rod 16 is squeezed by the adjacent limit block 131 during the outward sliding process. The rotating piston rod 16 drives the adjacent rotating stirring blade 15 to rotate relative to the adjacent fixed block 14, increasing the blade inclination angle of the rotating stirring blade 15, thereby increasing the ability of the rotating stirring blade 15 to stir the surrounding liquid, until the rotating piston rod 16 moves to the limit position (such as Fig.10 As shown), at this time, the extrusion ring 19 also moves to the limit position, the gas in the gas storage chamber has been completely discharged, the control terminal 101 controls the electric winch 12 to stop working, and the auxiliary stirring ring 11 maintains this position and stirs the surrounding liquid.

[0069] When the control terminal 101 lowers the auxiliary stirring ring 11 by controlling the electric winch 12, the extrusion ring 19 and the connecting piece 17 first move relative to each other under the elastic force of the elastic piece to reset. At this time, the extrusion ring 19 draws the gas in the fixed cylinder 13 into the gas storage chamber, and the rotating piston rod 16, the fixed block 14 and the rotating stirring blade 15 move and reset under the drive of the negative pressure of the gas. The rotating stirring blade 15 retracts into the inner stirring blade 112 to prevent the auxiliary stirring ring 11 from stirring the sediment too much, which affects the effect of promoting the separation of solid particles and oil droplets during circulation in the above scheme.

[0070] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the disclosed exemplary embodiments. The scope of protection claimed in the present invention should be given the broadest interpretation so as to encompass all modifications and equivalent structures and functions.

Claims

1. An oilfield oily sludge treatment device, characterized in that it comprises: A support frame (1), the support frame (1) being fixedly connected to a separation barrel (2) and a motor (3), the output shaft of the motor (3) being fixedly connected to a stirring rod (4), and the stirring rod (4) being located in the separation barrel (2); A plurality of first stirring blades (5) are arranged staggered and longitudinally spaced on the upper part of the stirring rod (4); A plurality of second stirring blades (6) are staggered and longitudinally spaced and arranged at the lower part of the stirring rod (4); A first guide ring (7) is fixedly connected to the stirring rod (4), the first guide ring (7) being located between all the first stirring blades (5) and all the second stirring blades (6); a second guide ring (8) disposed in the separation barrel (2), the second guide ring (8) and the first guide ring (7) being located on the same horizontal plane, the first guide ring (7) and the second guide ring (8) both being used to guide adjacent water flows; A spraying mechanism, arranged on the second guide ring (8), for adding a sludge treatment agent into the separation barrel (2); The auxiliary stirring mechanism is arranged on the second stirring blade (6) at the lowermost side and is used to promote the circulation of sediment settled at the bottom.

2. The oilfield oily sludge treatment device according to claim 1, characterized in that: The blade inclination direction of the first stirring blade (5) is opposite to the blade inclination direction of the second stirring blade (6).

3. The oilfield oily sludge treatment device according to claim 2, characterized in that: The maximum size of the lowermost first stirring blade (5) is smaller than the maximum sizes of the other first stirring blades (5), and the maximum size of the uppermost second stirring blade (6) is smaller than the maximum sizes of the other second stirring blades (6).

4. The oilfield oily sludge treatment device according to claim 3 is characterized in that: The blade inclination angle of the first stirring blade (5) located in the middle of all the first stirring blades (5) is greater than the blade inclination angles of the other first stirring blades (5), and the blade inclination angle of the second stirring blade (6) located in the middle of all the second stirring blades (6) is greater than the blade inclination angles of the other second stirring blades (6).

5. The oilfield oily sludge treatment device according to claim 4, characterized in that: The spraying mechanism comprises: A plurality of micro-sprinklers (81) are arranged at intervals in the circumferential direction on the upper and lower sides of the second guide ring (8); a liquid guide cavity connected to all the micro-sprinklers (81) is arranged in the second guide ring (8); A plurality of sliding tubes (9) are fixedly connected to the second guide ring (8) at circumferential intervals, the lower side of the sliding tube (9) is connected to the liquid guide cavity on the second guide ring (8), the upper side of the sliding tube (9) is connected to an external medicine storage barrel, and the separation barrel (2) is fixedly connected to a fixing ring (10), and the fixing ring (10) is slidably connected to the sliding tube (9).

6. The oilfield oily sludge treatment device according to claim 5, characterized in that: The auxiliary stirring mechanism comprises: An auxiliary stirring ring (11) is arranged on the second stirring blade (6) at the lowermost side; A plurality of external stirring blades (111) are arranged at circumferential intervals on the outside of the auxiliary stirring ring (11); There are a plurality of inner stirring blades (112) which are arranged at circumferential intervals on the inner side of the auxiliary stirring ring (11).

7. The oilfield oily sludge treatment device according to claim 6, characterized in that: The blade inclination direction of the outer stirring blade (111) is opposite to the blade inclination direction of the inner stirring blade (112), and the blade inclination direction of the inner stirring blade (112) is the same as the blade inclination direction of the second stirring blade (6).

8. The oilfield oily sludge treatment device according to claim 7, characterized in that: Also included are: A stirring enhancement mechanism is arranged on the auxiliary stirring ring (11) and is used to enhance the stirring effect of the auxiliary stirring ring (11) on the surrounding liquid when the auxiliary stirring ring (11) is located in the middle of the separation barrel (2). The stirring enhancement mechanism comprises: The number of fixed cylinders (13) is the same as the number of the inner stirring blades (112), and they are respectively fixedly connected to adjacent inner stirring blades (112); a fixed block (14) and a rotating stirring blade (15) are slidably connected to the inner stirring blade (112); the fixed block (14) is rotatably connected to the adjacent rotating stirring blade (15); the rotating stirring blade (15) is fixedly connected to a rotating piston rod (16); and the rotating piston rod (16) is slidably connected to the adjacent fixed cylinder (13); a connecting member (17) rotatably connected to the auxiliary stirring ring (11), the connecting member (17) being slidably connected to a plurality of fixing rods (18) arranged at intervals in the circumferential direction, the fixing rods (18) being fixedly connected to the second guide ring (8), the second guide ring (8) being slidably connected to the separation barrel (2), and the second guide ring (8) being press-fitted to the fixing ring (10); An electric winch (12) is fixedly connected to the support frame (1), the electric winch (12) is fixedly connected to the connecting member (17) via a steel strand, and the auxiliary stirring ring (11) is slidably connected to the adjacent second stirring blade (6); The extrusion ring (19) is slidably connected in the connecting piece (17), and an elastic piece is fixedly connected between the two. The fixing rod (18) is fixedly connected to the extrusion ring (19). The auxiliary stirring ring (11), the connecting piece (17) and the extrusion ring (19) together form an air storage chamber. The fixing cylinder (13) is connected to the air storage chamber.

9. The oilfield oily sludge treatment device according to claim 8, characterized in that: The rotating piston rod (16) is provided with a groove, and the groove is composed of a straight groove and an inclined groove. The fixed cylinder (13) is fixedly connected with a limit block (131) which is pressed and matched with the groove on the rotating piston rod (16).

10. The oilfield oily sludge treatment device according to claim 9, characterized in that: The volume of the air storage chamber is greater than the sum of the volumes of all the fixed cylinders (13).

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