Oil field single-well three-production polymer injection skid-mounted equipment and use method

Abstract

The invention relates to the technical field of oil field polymer injection, and discloses oil field single-well three-production polymer injection skid-mounted equipment and a using method.The oil field single-well three-production polymer injection skid-mounted equipment comprises a skid-mounted equipment body and a mixing tank and further comprises a dry powder box installed at the top of the mixing tank, and a discharging assembly is arranged at the lower end of the dry powder box; a partition plate is fixedly mounted on the inner wall of the mixing tank, a piston part is arranged on the upper side of the partition plate, a stirring rod fixedly connected with the rotating shaft is arranged on the upper side of the piston part, and a plurality of mixing stirring parts are rotationally connected to the bottom surface of the partition plate and are in transmission connection with the rotating shaft. When the material scattering piece rotates, dry powder is controlled to intermittently and uniformly fall, the dry powder is preliminarily mixed with upper-layer water under the action of the stirring rod, then the dry powder is vertically and uniformly sprayed into lower-layer water through the material mixing and stirring piece, and secondary mixing is completed under the rotation of the material mixing and stirring piece. Through uniform scattering and step-by-step stirring and mixing of the dry powder, the problem of caking of the dry powder is effectively avoided, meanwhile, the stirring and mixing effect is improved, and the mixing time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield polymer injection, and in particular to a skid-mounted equipment for oilfield single-well triple recovery polymer injection and a use method thereof. Background Art

[0002] In the field of tertiary oil recovery (TER) in oilfields, the TERR skid-mounted equipment, with its modular, integrated design, has revolutionized traditional TERR stations and become a core component of TERR sites. This highly integrated system, featuring a material storage system, dry powder mixing system, and pipelines, enables a one-stop solution for polymer dispersion, maturation, mixing, and high-pressure TERR operations, significantly improving crude oil recovery efficiency.

[0003] As the technical core of skid-mounted equipment, dry powder mixing equipment undertakes the critical task of uniformly dissolving polymer dry powder and water. The precisely proportioned polymer mother liquor, formed by this mixing, significantly increases fluid viscosity and optimizes the oil-water mobility ratio upon injection into the reservoir, making it a key component in improving crude oil recovery. However, current mainstream mechanical mixing technology still has significant limitations: when the polymer dry powder injection rate is too fast, agglomeration effects with localized excessive concentrations are very likely to occur, forcing the equipment to extend the mixing time to ensure dissolution. Furthermore, the convection generated by the agitator blades struggles to cover the entire tank area, forming mixing blind spots at the junction of the tank wall and the liquid surface. These areas cause the dry powder to continuously accumulate and agglomerate, ultimately producing a polymer mother liquor with uneven concentrations. Once injected into the reservoir, this mother liquor not only fails to fully realize its oil displacement efficiency, but can also cause blockage of the injection pipeline due to localized excessive viscosity, directly impacting the oilfield's production efficiency and economic benefits. Summary of the Invention

[0004] In view of the problems in the existing technology such as agglomeration effect and uneven mixing when mixing dry powder with water, a skid-mounted equipment for triple recovery and polymer injection in a single well of an oil field is proposed.

[0005] Its purpose is to uniformly add dry powder intermittently and complete the primary mixing with the upper layer of water, and the mixed liquid is evenly sprayed into the lower layer of water through the mixing and stirring parts for secondary mixing.

[0006] The technical solution of the present invention is a skid-mounted equipment for three-production and polymer injection in a single well of an oil field, comprising a skid-mounted equipment body and a mixing tank, and further comprising a dry powder box mounted on the top of the mixing tank, the lower portion of the dry powder box being fixedly inserted into the mixing tank, a discharging assembly being provided at the lower end of the dry powder box, a partition being fixedly mounted on the inner wall of the mixing tank, a piston being provided on the upper side of the partition, the piston being used to squeeze the solution on the upper side of the partition to the bottom of the mixing tank, a motor being fixedly mounted on the top of the dry powder box, a rotating shaft being connected to the conveying end of the motor, the lower end of the rotating shaft being movably inserted through the dry powder box and the piston extending to the lower side of the partition, a stirring rod being provided on the upper side of the piston being fixedly connected to the rotating shaft, a plurality of mixing and stirring members being rotatably connected to the bottom surface of the partition, and the mixing and stirring members being transmission-connected to the rotating shaft; The discharging assembly includes a receiving tray rotatably connected to the discharge end of the dry powder box, a plurality of scattering parts fixedly connected to the bottom surface of the receiving tray, the scattering parts are fixedly connected to the rotating shaft, an inclined storage channel is opened in the scattering part, and a plurality of drop holes connected to the storage channel are vertically opened in the scattering part.

[0007] Furthermore, a material control plate is slidably connected to the material spreading member, and a material dropout opening is provided on the material control plate at a position corresponding to the material dropout hole. One end of the material control plate away from the rotating shaft extends to the outside of the material spreading member, and an elastic member is commonly connected between the end of the material control plate and the material spreading member. The discharging assembly also includes a fixing ring fixedly connected to the dry powder box, the inner wall of the fixing ring is annularly fixed with a plurality of trapezoidal blocks at equal intervals, and the end of the material control plate away from the rotating shaft is connected to a guide wheel.

[0008] Furthermore, the distance between two adjacent blanking holes of the material spreading member in the direction of the rotating shaft increases successively.

[0009] Furthermore, the piston member includes a piston ring that is in sliding contact with the inner wall of the mixing tank, the cross-section of the piston ring is an I-shaped structure, a fixed plate is fixedly connected to the bottom of the inner wall of the piston ring, a movable plate that moves vertically is provided inside the piston ring, a plurality of arc-shaped holes are staggered between the movable plate and the fixed plate, and a plurality of electric push rods are fixedly connected between the movable plate and the inner wall of the mixing tank; The partition is provided with a through hole which is communicated with the mixing and stirring member.

[0010] Furthermore, the mixing and stirring element includes a vertical tube with an upward opening, the two ends of the vertical tube are rotatably connected to the bottom surface of the partition and the bottom surface of the mixing tank respectively, and a plurality of horizontal tubes are fixedly connected to the outer wall of the vertical tube, and the horizontal tubes are connected to the vertical tube; The lower end of the rotating shaft is fixedly connected with a driving gear, the upper end of the outer wall of the vertical tube is fixed with a driven gear, and the driven gear is meshed and connected with the driving gear.

[0011] Furthermore, a check valve is abutted against a port on a side of the horizontal pipe away from the vertical pipe.

[0012] Furthermore, a spoiler is provided on the upper portion of the inner wall of the vertical tube. The spoiler includes a connecting rod connected to the inner wall of the vertical tube. A plurality of L-shaped spoilers are fixedly connected to the connecting rod, and adjacent two spoilers are staggered.

[0013] Furthermore, a plurality of arc-shaped plates are fixedly connected to the lower portion of the inner wall of the mixing tank, and the arc-shaped plates are arranged at an inclination.

[0014] Another object of the present invention is to provide a method for using a skid-mounted equipment for triple recovery and polymer injection in a single well of an oil field, the purpose of which is to achieve uniform dosing of dry powder and uniform and rapid mixing with water.

[0015] To achieve the above-mentioned object, the present invention provides the following technical solution: a method for using a skid-mounted equipment for triple recovery and polymer injection in a single well of an oil field, comprising the following steps: S1. The dry powder conveying equipment in the skid-mounted equipment body adds dry powder into the dry powder box, and the liquid infusion pipe in the skid-mounted equipment body injects water into the mixing tank; S2. The dry powder enters the spreading part, the motor is started, the shaft drives the spreading part to rotate, the dry powder falls evenly into the upper water through the drop hole, and the stirring rod performs preliminary mixing of the water and dry powder; S3, the piston member descends to squeeze the mixed solution into the mixing and stirring member, and the mixing and stirring member rotates to spray the mixed solution into the lower layer of water, and stirs and mixes again by rotating to form a mother solution; S4. After mixing, the mother liquor is discharged through the liquid outlet at the bottom of the mixing tank, and the liquid infusion pipe in the main body of the skid-mounted equipment injects the mother liquor into the oil layer.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The dry powder is controlled to fall intermittently and evenly as the spreading element rotates. The stirring rod initially mixes the powder with the upper layer of water. The mixing element then sprays the powder vertically and evenly into the lower layer of water, where it is further mixed as the mixing element rotates. This even spreading of the powder and step-by-step mixing effectively prevents powder agglomeration, improves mixing quality, and shortens mixing time.

[0017] 2. When the solution passes through the spoiler area of ​​the vertical pipe, the spoiler changes its flow direction and speed, forcing the solution to form a complex turbulent state, allowing the solution to complete secondary mixing in the vertical pipe, further refining and dispersing the solute particles, and significantly improving the uniformity of the initial mixed solution.

[0018] 3. Under the guidance of the curved plate, the solution is forced to change its flow direction and climb upward along the inner wall of the tank, prompting the solution in this area to produce vertical convection, breaking the limitation of traditional stirring that easily forms mixing dead corners near the tank wall, so that the solution can fully circulate in both horizontal and vertical directions, significantly improving the comprehensiveness and uniformity of mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the skid-mounted equipment for triple recovery and polymer injection in a single well of an oil field according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the mixing tank of the oilfield single-well three-recovery and polymer injection skid-mounted equipment of the present invention; Figure 3This is a schematic cross-sectional view of the mixing tank structure of the oilfield single-well tertiary recovery and polymer injection skid-mounted equipment of the present invention; Figure 4 This is a schematic structural diagram of the dry powder box and discharge assembly of the oilfield single-well three-recovery and polymer injection skid-mounted equipment of the present invention; Figure 5 This is a schematic cross-sectional view of the structure of the material spreading component of the oilfield single-well three-recovery and polymer injection skid-mounted equipment of the present invention; Figure 6 This is a vertically disassembled schematic diagram of the piston structure of the oilfield single-well tertiary recovery and polymer injection skid-mounted equipment of the present invention; Figure 7 This is a schematic cross-sectional view of the piston structure of the oilfield single-well three-recovery and polymer injection skid-mounted equipment of the present invention; Figure 8 This is a schematic diagram of the structure of the rotating shaft and mixing and stirring parts of the oilfield single-well three-recovery and polymer injection skid-mounted equipment of the present invention; Figure 9 This is a schematic diagram of the cross pipe and check valve structure of the oilfield single-well three-recovery and polymer injection skid-mounted equipment of the present invention; Figure 10 This is a schematic diagram of the structure of the spoiler of the oilfield single-well tertiary recovery and polymer injection skid-mounted equipment of the present invention.

[0020] In the picture: 1. Skid-mounted equipment body; 2. Mixing tank; 3. Dry powder box; 4. Discharging assembly; 41. Receiving tray; 42. Sprinkling element; 43. Storage channel; 44. Control plate; 45. Fixed ring; 46. Trapezoidal block; 5. Partition; 6. Rotating shaft; 7. Piston; 71. Piston ring; 72. Fixed plate; 73. Movable plate; 74. Electric push rod; 8. Stirring rod; 9. Mixing and stirring element; 91. Vertical pipe; 92. Horizontal pipe; 93. Check valve; 10. Driving gear; 11. Driven gear; 12. Spoiler; 121. Connecting rod; 122. Spoiler; 13. Curved plate. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] Example 1, reference Figure 1-Figure 5, which is the first embodiment of the present invention, provides an oilfield single well three-production injection and polymerization skid-mounted equipment, including a skid-mounted equipment body 1 and a mixing tank 2, and also includes a dry powder box 3 installed on the top of the mixing tank 2, the lower part of the dry powder box 3 is fixedly penetrated into the mixing tank 2, and a discharge assembly 4 is provided at the lower end of the dry powder box 3. A partition 5 is fixedly installed on the inner wall of the mixing tank 2, and a piston member 7 is provided on the upper side of the partition 5. The piston member 7 is used to squeeze the solution on the upper side of the partition 5 to the bottom of the mixing tank 2. A motor is fixedly installed on the top of the dry powder box 3, and a rotating shaft 6 is connected to the conveying end of the motor. The lower end of the rotating shaft 6 is movably penetrated. The dry powder box 3 and the piston member 7 extend to the lower side of the partition 5. The upper side of the piston member 7 is provided with a stirring rod 8 fixedly connected to the rotating shaft 6. The bottom surface of the partition 5 is rotatably connected to a plurality of mixing and stirring members 9, and the mixing and stirring members 9 are transmission-connected to the rotating shaft 6; the discharging assembly 4 includes a receiving tray 41 rotatably connected to the discharging end of the dry powder box 3, and a plurality of scattering members 42 are fixedly connected to the bottom surface of the receiving tray 41. The scattering members 42 are fixedly connected to the rotating shaft 6, and an inclined storage channel 43 is opened in the scattering member 42, and a plurality of drop holes connected to the storage channel 43 are vertically opened in the scattering member 42.

[0023] Specifically, a fixed amount of water is stored at the bottom of the mixing tank 2 and above the partition 5. When the motor drives the rotating shaft 6 to rotate, the dry powder in the dry powder box 3 enters the various spreading parts 42 through the receiving tray 41 and is evenly distributed to the various drop holes through the inclined storage channel 43. The spreading parts 42 rotate synchronously with the rotating shaft 6, evenly throwing the dry powder into the upper layer of water. The rotation of the stirring rod 8 achieves preliminary mixing of the dry powder and the upper layer of water. Subsequently, the piston 7 moves downward to squeeze, so that the preliminary mixed liquid is evenly sprayed into the lower layer of water through the mixing and stirring parts 9. At the same time, the rotation of the mixing and stirring parts 9 drives the preliminary mixed liquid and the lower layer of water to fully blend, ultimately forming a uniform mother liquor.

[0024] It should be noted that reference Figure 3 The partition 5 is sealed against the inner wall of the mixing tank 2, dividing the interior of the mixing tank 2 into two independent mixing chambers, upper and lower. Through holes are provided at the upper and lower ends of the mixing tank 2, as well as on the bottom surface of the partition 5. The through hole at the upper end of the tank is used to inject a fixed amount of water into the upper mixing chamber, while the through hole at the bottom surface of the partition 5 is responsible for injecting water into the lower mixing chamber. The through hole at the lower end of the tank serves as a mother liquor outlet, allowing the evenly mixed mother liquor to be discharged smoothly from the tank after the mixing process is completed.

[0025] Reference Figure 4 、 Figure 5A material control plate 44 is slidably connected to the material spreading member 42, and a material dropping port is opened in the material control plate 44 at the position corresponding to the material dropping hole. The end of the material control plate 44 away from the rotating shaft 6 extends to the outside of the material spreading member 42, and an elastic member is commonly connected between this end of the material control plate 44 and the material spreading member 42; the discharge assembly 4 also includes a fixing ring 45 fixedly connected to the dry powder box 3, and the inner wall of the fixing ring 45 is annular and fixedly connected with multiple trapezoidal blocks 46 at equal intervals, and the end of the material control plate 44 away from the rotating shaft 6 is connected to a guide wheel.

[0026] Specifically, in the absence of external force, the elastic member drives the control plate 44 to move, allowing its core to precisely block the dropout hole, effectively preventing the dry powder from falling. When the spreading member 42 rotates with the rotating shaft 6, the guide wheel at the end of the control plate 44 contacts the trapezoidal block 46 on the inner wall of the fixed ring 45. Under the guidance of the inclined surface of the trapezoidal block 46, the guide wheel drives the control plate 44 to move laterally, overcoming the tension of the elastic member, so that the dropout opening on the control plate 44 completely overlaps with the dropout hole. At this time, the dry powder can be evenly scattered into the upper water layer through the dropout hole. As the spreading member 42 continues to rotate, the guide wheel disengages the trapezoidal block 46, and the elastic member resets, driving the control plate 44 to re-block the dropout hole, stopping the dropout. This cycle achieves intermittent and uniform mixing of dry powder and water, effectively avoiding the problems of agglomeration or uneven mixing caused by concentrated dry powder delivery, and ensuring the stability and efficiency of the mixing effect.

[0027] Reference Figure 5 The distance between two adjacent blanking holes of the spreading member 42 in the direction toward the rotating shaft 6 increases successively.

[0028] Specifically, the spacing between adjacent dropout holes in the spreading element 42, directed toward the rotating shaft 6, is arranged in a gradient. During operation, due to the varying rotational radii of the dropout holes, the dropout holes farther from the rotating shaft 6 experience greater linear velocities and longer displacement distances. This stepwise spacing design balances the variations in spreading distance caused by the varying rotational radii of the dropout holes, ensuring that within the same rotation cycle, dry powder ejected from dropout holes at different locations covers the upper water surface with a uniform density, effectively preventing localized accumulation or uneven distribution of dry powder.

[0029] Reference Figure 3 、 Figure 6 and Figure 7 The piston member 7 includes a piston ring 71 that is in sliding contact with the inner wall of the mixing tank 2. The cross-section of the piston ring 71 is an I-shaped structure. A fixed plate 72 is fixedly connected to the bottom of the inner wall of the piston ring 71. A movable plate 73 that moves vertically is provided in the piston ring 71. A plurality of arc-shaped holes are staggered between the movable plate 73 and the fixed plate 72, and a plurality of electric push rods 74 are fixedly connected between the movable plate 73 and the inner wall of the mixing tank 2; a through hole that is connected to the mixing stirring member 9 is provided on the partition plate 5.

[0030] Specifically, when the electric push rod 74 starts and extends upward, the movable plate 73 slides upward along the vertical track in the piston ring 71, and the movable plate 73 separates from the fixed plate 72, and the arc-shaped holes staggered between the two are immediately opened. At this time, the mixed liquid in the upper mixing chamber can flow through the arc-shaped holes and flow to the top surface of the partition 5 for temporary storage. When the electric push rod 74 shrinks and descends in the opposite direction, the movable plate 73 moves downward synchronously until it is tightly abutted against the fixed plate 72, and the surfaces of the two are fitted to form a sealing structure. Subsequently, the movable plate 73, by virtue of its connection with the piston ring 71, drives the entire piston ring 71 to move downward, and squeezes the mixed liquid temporarily stored on the top surface of the partition 5 into the lower mixing chamber through the through holes on the partition 5 with a uniform and stable pressure, providing material input for the subsequent fine mixing process of the mixing and stirring element 9.

[0031] Understandably, referring to Figure 7 A sealing ring is embedded in the arc-shaped outer side of piston ring 71, tightly fitting the inner wall of mixing tank 2 and effectively preventing liquid leakage. A movable sealing ring is installed at the connection between fixed plate 72 and rotating shaft 6, ensuring flexible rotation of rotating shaft 6 while preventing liquid from escaping from the shaft hole gap. Multiple sets of sealing rings of varying diameters are concentrically arranged on the bottom surface of movable plate 73, forming a stepped sealing structure. When electric push rod 74 drives movable plate 73 downward to engage fixed plate 72, the multiple sealing rings cooperate to form a tight sealing system, ensuring that the mixed liquid does not leak during the extrusion process.

[0032] Example 2, reference Figure 8 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the mixing and stirring member 9 includes a vertical pipe 91 with an opening arranged upward, and the two ends of the vertical pipe 91 are rotatably connected to the bottom surface of the partition 5 and the bottom surface of the mixing tank 2 respectively. A plurality of horizontal pipes 92 are fixedly connected to the outer wall of the vertical pipe 91, and the horizontal pipes 92 are connected to the vertical pipe 91; the lower end of the rotating shaft 6 is fixedly connected to the driving gear 10, and the upper end of the outer wall of the vertical pipe 91 is fixed to the driven gear 11, and the driven gear 11 is meshed with the driving gear 10.

[0033] Specifically, when the piston 7 is squeezed downward, the mixed liquid is injected into the vertical pipe 91 through the through hole of the partition 5, and then is evenly sprayed into the lower layer of water in a vertical downward direction through a plurality of horizontal pipes 92 connected thereto. This vertical injection method greatly shortens the diffusion time of the mixed liquid in water and accelerates the initial fusion with the lower layer of water. At the same time, the driving gear 10 at the lower end of the rotating shaft 6 and the driven gear 11 at the upper end of the vertical pipe 91 are engaged with each other. As the rotating shaft 6 rotates, the vertical pipe 91 and the horizontal pipe 92 are driven to rotate synchronously, and the solution that has been initially fused is stirred and mixed for the second time. The step-by-step mixing process of intermittent and uniform addition of dry powder, initial mixing of the upper layer of water, and secondary stirring of the lower layer of water not only effectively avoids the dry powder agglomeration phenomenon, but also significantly improves the mixing efficiency and uniformity, and greatly shortens the time required for the preparation of the mother liquor.

[0034] The mixing and stirring element 9 adopts a dual mixing mechanism that combines injection and stirring. The vertical spraying design accelerates liquid diffusion, and the gear-driven stirring structure realizes all-round uniform mixing. The synergistic effect of the two significantly improves the mixing efficiency; the step-by-step mixing process targets the pain point that dry powder is prone to agglomeration, and through precise control in stages, ensures that the mixing process is efficient and stable, effectively improves the quality of the mother liquor, reduces energy consumption, and improves the overall benefits of the oilfield's three-recovery and injection-polymerization operations.

[0035] Reference Figure 9 The end of the horizontal pipe 92 away from the vertical pipe 91 is abutted with a check valve 93.

[0036] Specifically, the check valve 93 is made of a retractable rubber material. One end of the check valve 93 is fixed to the inner wall of the horizontal tube 92, and the other end is in contact with the port of the horizontal tube 92. When the piston 7 squeezes the mixed liquid into the vertical tube 91 and flows to the horizontal tube 92, the internal pressure pushes the check valve 93 to deform and open, and the mixed liquid is sprayed out in an umbrella shape through the gap between the check valve 93 and the port of the horizontal tube 92, thereby expanding the spraying range of the solution and further improving the mixing efficiency with water; and when the squeezing pressure disappears, the check valve 93 quickly resets itself by virtue of its own elasticity, blocking the liquid reflux path, thereby realizing one-way precise control of the flow of the solution in the horizontal tube 92.

[0037] Reference Figure 3 A plurality of arc-shaped plates 13 are fixedly connected to the lower portion of the inner wall of the mixing tank 2, and the arc-shaped plates 13 are arranged at an angle.

[0038] Specifically, when the mixing agitator 9 is in operation to stir the solution, the liquid near the inner wall of the tank is forced to change its flow direction and climb upward along the inner wall of the tank under the guidance of the curved plate 13. This unique design causes the solution in this area to produce vertical convection, breaking the limitation that traditional stirring easily forms mixing dead corners near the tank wall, so that the solution can fully circulate in both horizontal and vertical directions, significantly improving the comprehensiveness and uniformity of the mixing. The curved plate 13, through its ingenious fluid mechanics design, can guide the solution to form a three-dimensional circulation without the need for an additional power device, effectively eliminating the mixing blind spot near the tank wall and improving the overall mixing effect. The remaining structure is the same as that of Example 1.

[0039] Example 3, reference Figure 10 , which is the third embodiment of the present invention. This embodiment differs from the second embodiment in that a spoiler 12 is provided on the upper portion of the inner wall of the vertical tube 91. The spoiler 12 includes a connecting rod 121 connected to the inner wall of the vertical tube 91. A plurality of L-shaped spoilers 122 are fixedly connected to the connecting rod 121. Adjacent spoilers 122 are staggered.

[0040] Specifically, when the upper mixed liquid is squeezed into the vertical pipe 91 by the piston member 7, the flowing solution will continuously change its flow direction and speed when passing through the spoiler 12 area, forcing the solution to form a complex turbulent state. This turbulent effect allows the solution to complete secondary mixing in the vertical pipe 91, further refining and dispersing the solute particles, and significantly improving the uniformity of the preliminary mixed liquid. When the pre-mixed and strengthened solution is subsequently sprayed into the lower water through the horizontal pipe 92, it can merge with the lower water body more quickly, shortening the overall mixing time.

[0041] Based on Examples 1-3, the working principle of the present invention is as follows: when the oilfield single-well three-production and injection skid-mounted equipment is working, water is stored in the bottom of the mixing tank 2 and the upper part of the partition 5 respectively, the motor drives the rotating shaft 6 to rotate, and the dry powder in the dry powder box 3 enters the spreading part 42 through the receiving tray 41, and is distributed to the drop hole through the inclined storage channel 43. The spreading part 42 rotates to sprinkle the dry powder to the upper layer of water, and cooperates with the stirring rod 8 for preliminary mixing. Under the action of the electric push rod 74, the piston part 7 first allows the mixed liquid to flow through the arc hole to the top surface of the partition 5 for temporary storage, and then squeezes the mixed liquid downward to the vertical pipe 91, and sprays it to the lower layer of water through the horizontal pipe 92. At the same time, the rotating shaft 6 drives the vertical pipe 91 and the horizontal pipe 92 to rotate through the gears, and stirs and mixes the solution twice, and finally forms a uniform mother liquor that is discharged from the through hole at the lower end of the tank body.

[0042] Example 4, with reference to Figures 1-10 , which is a fourth embodiment of the present invention, provides: a method for using a skid-mounted equipment for triple recovery and polymer injection in a single well of an oil field, comprising the following steps: S1. The dry powder conveying device in the skid-mounted equipment body 1 adds dry powder to the dry powder box 3, and the infusion pipe in the skid-mounted equipment body 1 injects water into the mixing tank 2; S2: The dry powder enters the spreading member 42, the motor is started, the rotating shaft 6 drives the spreading member 42 to rotate, and the dry powder falls evenly into the upper water through the drop hole, and the stirring rod 8 performs a preliminary mixing and stirring of the water and the dry powder; S3, the piston 7 descends to squeeze the mixed solution into the mixing and stirring member 9, and the mixing and stirring member 9 rotates to spray the mixed solution into the lower layer of water, and stirs and mixes again by rotating to form a mother solution; S4. After the mixing is completed, the mother liquid is discharged through the liquid outlet at the lower part of the mixing tank 2, and the liquid infusion pipe in the skid-mounted equipment body 1 injects the mother liquid into the oil layer.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An oilfield single-well three-recovery polymer injection skid-mounted equipment, comprising a skid-mounted equipment body (1) and a mixing tank (2), characterized in that: It also includes a dry powder box (3) installed on the top of the mixing tank (2), the lower part of the dry powder box (3) is fixedly inserted into the mixing tank (2), the lower end of the dry powder box (3) is provided with a discharge assembly (4), the inner wall of the mixing tank (2) is fixedly installed with a partition (5), the upper side of the partition (5) is provided with a piston (7), the piston (7) is used to squeeze the solution on the upper side of the partition (5) to the bottom of the mixing tank (2), the top of the dry powder box (3) is fixedly installed with a motor, the conveying end of the motor is connected to a rotating shaft (6), the lower end of the rotating shaft (6) movably passes through the dry powder box (3), the piston (7) extends to the lower side of the partition (5), the upper side of the piston (7) is provided with a stirring rod (8) fixedly connected to the rotating shaft (6), the bottom surface of the partition (5) is rotatably connected to a plurality of mixing and stirring members (9), and the mixing and stirring members (9) are transmission-connected to the rotating shaft (6); The discharging assembly (4) includes a receiving tray (41) rotatably connected to the discharging end of the dry powder box (3), a plurality of scattering members (42) are fixedly connected to the bottom surface of the receiving tray (41), the scattering members (42) are fixedly connected to the rotating shaft (6), an inclined storage channel (43) is provided in the scattering member (42), and a plurality of drop holes in communication with the storage channel (43) are vertically provided in the scattering member (42).

2. The oilfield single well three-recovery and polymer injection skid-mounted equipment according to claim 1, characterized in that: A material control plate (44) is slidably connected to the material spreading member (42), and a material drop opening is provided on the material control plate (44) at a position corresponding to the drop opening. One end of the material control plate (44) away from the rotating shaft (6) extends to the outside of the material spreading member (42), and an elastic member is commonly connected between the end of the material control plate (44) and the material spreading member (42); The discharging assembly (4) further comprises a fixing ring (45) fixedly connected to the dry powder box (3), wherein the inner wall of the fixing ring (45) is fixedly connected with a plurality of trapezoidal blocks (46) at equal intervals in a circular shape, and the end of the material control plate (44) away from the rotating shaft (6) is connected to a guide wheel.

3. The oilfield single well three-recovery and polymer injection skid-mounted equipment according to claim 1, characterized in that: The spacing between two adjacent blanking holes of the material spreading member (42) in the direction toward the rotating shaft (6) increases sequentially.

4. The oilfield single well three-recovery and polymer injection skid-mounted equipment according to claim 1, characterized in that: The piston member (7) includes a piston ring (71) in sliding contact with the inner wall of the mixing tank (2), the cross section of the piston ring (71) is an I-shaped structure, a fixed plate (72) is fixedly connected to the bottom of the inner wall of the piston ring (71), a movable plate (73) that moves vertically is provided in the piston ring (71), a plurality of arc-shaped holes are staggered between the movable plate (73) and the fixed plate (72), and a plurality of electric push rods (74) are fixedly connected between the movable plate (73) and the inner wall of the mixing tank (2); The partition (5) is provided with a through hole that is in communication with the mixing and stirring member (9).

5. The oilfield single well three-recovery and polymer injection skid-mounted equipment according to claim 1, characterized in that: The mixing and stirring member (9) comprises a vertical pipe (91) with an opening facing upward, the two ends of the vertical pipe (91) being rotatably connected to the bottom surface of the partition (5) and the bottom surface of the mixing tank (2), respectively, and a plurality of horizontal pipes (92) being fixedly connected to the outer wall of the vertical pipe (91), the horizontal pipes (92) being in communication with the vertical pipe (91); The lower end of the rotating shaft (6) is fixedly connected to a driving gear (10), and the upper end of the outer wall of the vertical tube (91) is fixed to a driven gear (11), and the driven gear (11) is meshed and connected with the driving gear (10).

6. The oilfield single well three-recovery and polymer injection skid-mounted equipment according to claim 5, characterized in that: A check valve (93) is abutted against the end of the horizontal pipe (92) away from the vertical pipe (91).

7. The oilfield single well three-recovery and polymer injection skid-mounted equipment according to claim 5, characterized in that: A spoiler (12) is provided on the upper portion of the inner wall of the vertical tube (91), the spoiler (12) comprising a connecting rod (121) connected to the inner wall of the vertical tube (91), a plurality of spoilers (122) in an L-shaped structure are fixedly connected to the connecting rod (121), and adjacent two spoilers (122) are arranged in a staggered manner.

8. The oilfield single well three-recovery and polymer injection skid-mounted equipment according to claim 1, characterized in that: A plurality of arc-shaped plates (13) are fixedly connected to the lower portion of the inner wall of the mixing tank (2), and the arc-shaped plates (13) are arranged in an inclined manner.

9. A method for using a skid-mounted equipment for triple recovery and polymer injection in a single well of an oil field, which is applied to the skid-mounted equipment for triple recovery and polymer injection in a single well of an oil field according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The dry powder conveying equipment in the skid-mounted equipment body (1) adds dry powder into the dry powder box (3), and the liquid infusion pipe in the skid-mounted equipment body (1) injects water into the mixing tank (2); S2, the dry powder enters the spreading member (42), the motor is started, the rotating shaft (6) drives the spreading member (42) to rotate, the dry powder falls evenly into the upper water through the drop hole, and the stirring rod (8) performs preliminary mixing and stirring on the water and the dry powder; S3, the piston (7) descends to squeeze the mixed solution into the mixing and stirring member (9), and the mixing and stirring member (9) rotates to spray the mixed solution into the lower layer of water, and stirs and mixes again by rotating to form a mother solution; S4. After the mixing is completed, the mother liquid is discharged through the liquid outlet at the bottom of the mixing tank (2), and the liquid infusion pipe in the skid-mounted equipment body (1) injects the mother liquid into the oil layer.

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