Collecting tank in oilfield produced sediment reinjection system

Abstract

The utility model discloses a collecting tank in an oilfield produced sediment reinjection system, which is characterized in that the bottom of a rectangular box body is provided with a strip-shaped conical hopper, the lower end of the strip-shaped conical hopper is provided with an arc-shaped bottom extending along the length direction of the box body, and the middle section of the bottom of the strip-shaped conical hopper is connected with a discharge pipe extending outwards along the width direction of the box body; two discharging spirals for conveying materials to the discharging pipe are installed in the axial direction of the arc-shaped bottom in an opposite mode, and bin wall vibrators are installed on the outer sides of the two inclined side walls of the long-strip-shaped conical hopper respectively. A box body feeding port is formed in the side wall of the upper portion of the end of one side of the rectangular box body, a sludge discharging hopper is fixed to the outer side of the lower portion of the end of the same side of the box body, a bottom outlet of the sludge discharging hopper is connected with a lower inlet of a spiral feeding machine through a feeding bent pipe, the axis of the spiral feeding machine extends upwards in an inclined mode, and an upper end outlet of the spiral feeding machine is connected with the box body feeding port. According to the collecting tank, normal reinjection of oil fields in temperate zones and cold temperate zones in winter can be guaranteed without heating, and continuous operation all the year round is achieved.

Description

Technical Field

[0001] The utility model relates to an oilfield reinjection system, in particular to a collecting tank in an oilfield produced sediment reinjection system, belonging to the technical field of formation reinjection equipment. Background Art

[0002] With the development of oil fields, a large amount of oil-containing wastewater will be generated during the production and development process, such as joint station production water, well washing wastewater and drilling wastewater. At the same time, in the later stage of oil and gas field development, oil and gas wells produce a large amount of water, and the formation energy is deficient. In order to alleviate the rate of formation energy decline and replenish the formation energy in time, a large amount of water injection is required. The water produced by oil and gas wells is treated and injected back into the formation to enhance the formation pressure, slow down the decline in production capacity, reduce sewage discharge, and form a virtuous cycle of production and injection balance, which has very important industrial and environmental significance. The reinjection of oilfield produced sediments also plays such a role. Therefore, the implementation of oilfields to treat produced sediments and then inject them back is not only of great social significance, but also will produce huge economic benefits.

[0003] The oilfield produced sediment reinjection device is used to process the produced sediment in the oilfield and reinject it into the well. It is usually composed of a produced fluid receiving unit, a sediment separation unit, a reinjection unit, a control system, a pipeline system, an injection pump and other equipment. At present, the collection tank in the reinjection unit of the oilfield is mainly composed of a sediment receiving box, a filter, a stirrer, a tank body, a pipe network and related accessories.

[0004] The tank is a rectangular parallelepiped, and the sludge near the discharge port has good fluidity, while most of the bottom area forms a dead zone because it is far away from the discharge port. The sludge in the corners cannot be renewed, which not only causes excessive sedimentation of the sludge to form compaction, but also due to the influence of regional weather, in the low temperature in winter, the sludge in the retention area first freezes and ices, further reducing the effective volume of the tank, and gradually expands to the central area, eventually causing the system to fail to operate normally.

[0005] The use of electric heating devices to improve the existing working conditions has high electricity consumption costs and many safety hazards. On the other hand, it cannot improve the flow performance of the compacted area. Without heating devices, Jiangsu Oilfield and other oilfields stopped injection at the end of November, and the suspension time lasted for 3 months, which had a negative impact on sediment treatment and the economic benefits of the oil production plant.

[0006] In addition, since the unloading height of the sludge tanker is limited, when the material level in the tank is high, the sludge tanker needs to wait for a long time and continue unloading after the material level is lowered, resulting in serious pressure on the tanker, low utilization rate of the tanker, and low effective transportation capacity. Utility Model Content

[0007] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0008] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0009] The purpose of the utility model is to overcome the problems existing in the prior art and provide a collecting tank in an oilfield produced sediment reinjection system, which can ensure normal reinjection in winter for oilfields in temperate and cold temperate zones without the need for heating, thereby achieving continuous operation throughout the year.

[0010] In order to solve the above technical problems, the utility model provides a collecting tank in an oilfield produced sediment reinjection system, comprising a rectangular box body, a long conical bucket is provided at the bottom of the rectangular box body, the lower end of the long conical bucket is provided with an arc-shaped bottom extending along the length direction of the box body, and the middle section of the bottom of the long conical bucket is connected with a discharge pipe extending outward along the width direction of the box body; two discharge spirals for feeding materials to the discharge pipe are installed axially opposite to each other along the arc-shaped bottom, and warehouse wall vibrators are respectively installed on the outer sides of the two inclined side walls of the long conical bucket.

[0011] As an improvement of the utility model, the discharge pipe extends symmetrically along the width direction of the box body, a discharge valve is installed at one end outlet, and a sand cleaning door is provided at the other end outlet.

[0012] As a further improvement of the utility model, the upper side wall of one end of the rectangular box is provided with a box feed port, and a sludge unloading hopper is fixed to the lower outer side of the end on the same side of the box. The bottom outlet of the sludge unloading hopper is connected to the lower inlet of the screw loader through a feeding elbow, and the axis of the screw loader extends obliquely upward and the upper end outlet is connected to the box feed port.

[0013] As a further improvement of the utility model, a top cover is provided on the top of the rectangular box, and a stirring mechanism is installed on the top cover. The stirring mechanism includes a stirring reduction box driven by a stirring motor, and the output end of the stirring reduction box is connected to a stirring shaft. The lower end of the stirring shaft extends toward the lower part of the inner cavity of the rectangular box and is equipped with a stirring blade.

[0014] As a further improvement of the present invention, the stirring mechanism is located on the axis of the length direction of the rectangular box and two stirring mechanisms are symmetrically provided.

[0015] As a further improvement of the utility model, a water tank is separated at one end of the inner cavity of the rectangular box body, and a plurality of dilution water injection ports are provided on the top cover, each of which is connected to a dilution water supply pipe through a water injection valve, the inlet of the dilution water supply pipe is connected to the outlet of a water replenishment pump, and the inlet pipe of the water replenishment pump is connected to the water tank.

[0016] As a further improvement of the utility model, the water replenishment pump is a self-priming pump and is installed on the top cover.

[0017] As a further improvement of the utility model, a rigid frame is provided around the rectangular box body, and a fence is provided around the top cover of the rectangular box body.

[0018] As a further improvement of the utility model, an inclined ladder is provided on one side of the rectangular box, and the upper end of the inclined ladder is connected to the opening of the fence.

[0019] As a further improvement of the utility model, a manhole is provided on the top cover of the rectangular box body, the manhole is close to one side wall of the box body, and a ladder is provided on the corresponding side wall of the box body.

[0020] As a further improvement of the utility model, a screen is provided in the middle section of the sludge discharge hopper.

[0021] As a further improvement of the utility model, at least two bin wall vibrators are provided on the corresponding inclined side walls.

[0022] As a further improvement of the present invention, a liquid level meter is installed on the side wall of the rectangular box.

[0023] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. Prolonging the construction period of profile adjustment of produced sediments and realizing normal construction in winter. Taking Jiangsu Oilfield as an example, the annual labor income can be increased by 3 million yuan.

[0024] 2. Realize normal, stable and continuous operation of the injection process and improve equipment utilization by 30%.

[0025] 3. Improving the utilization rate of tank trucks can free up tank trucks and increase the sediment transportation capacity of tank trucks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. The drawings are only provided for reference and explanation, not for limiting the present utility model. Among them:

[0027] Figure 1 This is a front view of a collection tank in the oilfield produced sediment reinjection system of the utility model;

[0028] Figure 2 for Figure 1 A top view of

[0029] Figure 3 for Figure 1 Left-view enlarged image of ;

[0030] Figure 4 for Figure 1 Stereoscopic image of

[0031] Figure 5 for Figure 1 The enlarged right view after removing the inclined ladder;

[0032] Figure 6 for Figure 5 Sectional view along AA;

[0033] Figure 7 for Figure 4 The front view of the medium sludge feeding mechanism;

[0034] In the figure: 1. Sludge unloading hopper; 2. Screen; 3. Feeding elbow; 4. Screw feeder; 5. Rectangular box; 5a. Box feed port; 5b. Top cover; 5c. Manhole; 5d. Liquid level meter; 5e. Ladder; 6. Long conical bucket; 7. Discharge motor; 8. Discharge screw; 9. Discharge pipe; 10. Discharge valve; 11. Sand cleaning door; 12. Silo wall vibrator; 13. Water tank; 14. Make-up water pump; 15. Dilution water supply pipe; 16. Water injection valve; 17. Dilution water injection port; 18. Stirring motor; 19. Stirring reduction box; 20. Stirring shaft; 21. Stirring blades; 22. Rigid frame; 23. Fence; 24. Inclined ladder. DETAILED DESCRIPTION

[0035] In the following description of the utility model, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a specific direction.

[0036] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific figures. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0038] like Figures 1 to 7 As shown, the collecting tank in the oilfield produced sediment reinjection system of the utility model comprises a sludge unloading hopper 1, a screw feeder 4, a rectangular box 5, a long strip cone hopper 6, a discharge screw 8 and a discharge pipe 9. The rectangular box 5 is fixed in a rigid frame 22 around the periphery, and a plurality of angle steels are also provided on the outside to improve the strength of the box wall.

[0039] The box feed port 5a is arranged on the upper side wall of one end of the rectangular box 5 to increase the effective volume of the collection tank. A liquid level meter 5d is installed on the side wall of the rectangular box 5 to monitor the amount of sludge in the box. A sludge discharge hopper 1 is fixed to the outer side below the box end on the same side as the box feed port 5a. A screen 2 is arranged in the middle section of the sludge discharge hopper 1. The bottom outlet of the sludge discharge hopper 1 is connected to the lower inlet of the screw feeder 4 through the feeding elbow 3. The axis of the screw feeder 4 extends obliquely upward and the upper outlet is connected to the box feed port 5a.

[0040] The inner side of the upper port of the sludge unloading hopper 1 is higher than the outer side to prevent the sludge tanker from overflowing when unloading. After the sludge entering the sludge unloading hopper 1 is filtered out of gravel and impurities by the filter screen, it enters the lower entrance of the screw feeder 4 from its lower port through the feeding elbow 3, is lifted upward by the screw feeder 4, and is sent to the box feed port 5a on the upper side wall of the rectangular box 5. This not only solves the problem of the unloading acceptance height, but also greatly increases the actual effective volume of the collection tank. The sludge tanker can unload into the low-position sludge unloading hopper 1 without waiting, and is lifted upward by the screw feeder 4, which greatly reduces the unloading waiting time of the sludge tanker and improves the transportation efficiency of the sludge tanker.

[0041] A top cover 5b is provided on the top of the rectangular box body 5, and a long conical bucket 6 is provided on the bottom of the rectangular box body 5. The lower end of the long conical bucket 6 is provided with an arc-shaped bottom extending along the length direction of the box body, and the middle section of the bottom of the long conical bucket 6 is connected to a discharge pipe 9 extending outward along the width direction of the box body; the discharge pipe 9 extends symmetrically along the width direction of the box body, and a discharge valve 10 is installed at one end of the outlet, and the outlet of the discharge valve 10 is connected to the suction port pipeline of the injection pump.

[0042] Two discharging screws 8 are installed axially opposite to each other along the arc bottom, and the outlets of the two discharging screws 8 are symmetrically connected to the inlet end of the discharging pipe 9. Driven by the discharging motor 7, the two discharging screws 8 rotate continuously, continuously sending the bottom sludge into the discharging pipe 9, and an injection pump is used to inject it into the well.

[0043] By setting a gradually shrinking long strip cone hopper 6 at the bottom of the box, all the sludge is guided to the discharge screw 8, and is quickly discharged from the middle discharge pipe 9 under the drive of the discharge screw 8. This can prevent the sludge from being retained at the bottom of the box and from being excessively settled and compacted, so that the sludge entering the box has good fluidity; and because the sludge is always in a flowing and updating state, it is not easy to freeze due to loss of temperature.

[0044] Silo wall vibrators 12 are respectively installed on the outer sides of the two inclined side walls of the long strip cone bucket 6, and at least two silo wall vibrators 12 are arranged on the corresponding inclined side walls. Even if a small amount of sludge stagnates on the inclined wall of the long strip cone bucket 6, or ice chips appear on the inclined wall, it will quickly move downward under the vibration of the silo wall vibrator 12 and merge into the material flow at the bottom, and will not be interrupted due to ice.

[0045] A sand cleaning door 11 is provided at the outlet of the other end of the discharge pipe 9 , which is convenient for opening regularly to clean the sand and impurities deposited in the discharge pipe 9 .

[0046] A stirring mechanism is installed on the top cover 5b, and preferably two stirring mechanisms are symmetrically arranged on the axis of the length direction of the rectangular box 5. The stirring mechanism includes a stirring reduction box 19 driven by a stirring motor 18, and the output end of the stirring reduction box 19 is connected to a stirring shaft 20, and the lower end of the stirring shaft 20 extends to the lower part of the inner cavity of the rectangular box 5 and is installed with a stirring blade 21. After the stirring motor 18 is decelerated by the stirring reduction box 19, it drives the stirring shaft 20 and the stirring blade 21 to rotate continuously, stirring the sludge in the box to prevent excessive sedimentation of the sludge, and further ensure that the sludge does not settle and agglomerate.

[0047] A certain space is separated at one end of the inner cavity of the rectangular box body 5 by a partition as a water tank 13. A plurality of dilution water injection ports 17 are provided on the top cover 5b. Each dilution water injection port 17 is connected to a dilution water supply pipe 15 through a water injection valve 16. The inlet of the dilution water supply pipe 15 is connected to the outlet of the water replenishment pump 14. The inlet pipe of the water replenishment pump 14 is connected to the water tank 13. The water replenishment pump 14 can be a submersible pump placed at the bottom of the water tank 13; or it can be a self-priming pump installed on the top cover 5b for easy maintenance.

[0048] When the sludge concentration in the box is high, the water replenishment pump 14 is started, each water injection valve 16 is opened, and a certain amount of replenishment water is injected into each dilution water injection port 17 through the dilution water supply pipe 15 to dilute the sludge and facilitate the suction of the injection pump.

[0049] A fence 23 is arranged around the top cover 5b of the rectangular box 5, and an inclined ladder 24 is arranged on one side of the rectangular box 5. The upper end of the inclined ladder 24 is connected to the opening of the fence 23, so that the operator can climb to the top of the box to perform operations or maintenance.

[0050] A manhole 5c is provided on the top cover 5b of the rectangular box 5, and the manhole 5c is close to one side wall of the box, and a ladder 5e is provided on the corresponding side wall of the box, which is convenient for entering the box for welding or cleaning welding slag or debris during production; in special circumstances, after replacing fresh air in the box, it is also convenient to enter the box for maintenance or cleaning.

[0051] After the new collection tank is manufactured according to the structural drawings in this technical solution, the collection tank with new functions will replace the original reinjection square tank. At the same time, the connection of relevant pipelines and the installation and commissioning of electrical appliances will be completed, so that the injection process can be operated normally, smoothly and continuously throughout the year.

[0052] The above description is only the preferred feasible embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model, but does not limit the scope of patent protection of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. In addition to the above embodiments, the utility model can also have other implementation modes without departing from the spirit and scope of the utility model. The utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents. The technical features not described in the utility model can be achieved by or using existing technologies, which will not be repeated here.

Claims

1. A collecting tank in an oilfield produced sediment reinjection system, comprising a rectangular box, characterized in that: A long conical bucket is provided at the bottom of the rectangular box, and an arc-shaped bottom extending along the length direction of the box is provided at the lower end of the long conical bucket. A discharge pipe extending outward along the width direction of the box is connected to the middle section of the bottom of the long conical bucket; two discharge screws for feeding materials to the discharge pipe are installed axially opposite to each other along the arc-shaped bottom, and bin wall vibrators are respectively installed on the outer sides of the two inclined side walls of the long conical bucket.

2. The collecting tank in the oilfield produced sediment reinjection system according to claim 1, characterized in that: The discharge pipe extends symmetrically along the width direction of the box body, a discharge valve is installed at one end outlet, and a sand cleaning door is provided at the other end outlet.

3. The collecting tank in the oilfield produced sediment reinjection system according to claim 1, characterized in that: A box feed port is provided on the upper side wall of one end of the rectangular box, and a sludge unloading hopper is fixed to the lower outer side of the end on the same side of the box. The bottom outlet of the sludge unloading hopper is connected to the lower inlet of the screw loader through a feeding elbow, and the axis of the screw loader extends obliquely upward and the upper end outlet is connected to the box feed port.

4. The collecting tank in the oilfield produced sediment reinjection system according to claim 1, characterized in that: A top cover is provided on the top of the rectangular box, and a stirring mechanism is installed on the top cover. The stirring mechanism includes a stirring reduction box driven by a stirring motor, and the output end of the stirring reduction box is connected to a stirring shaft. The lower end of the stirring shaft extends to the lower part of the inner cavity of the rectangular box and is equipped with a stirring blade.

5. The collecting tank in the oilfield produced sediment reinjection system according to claim 4, characterized in that: The stirring mechanism is located on the axis of the length direction of the rectangular box body and two stirring mechanisms are symmetrically arranged.

6. The collecting tank in the oilfield produced sediment reinjection system according to claim 4, characterized in that: A water tank is separated at one end of the inner cavity of the rectangular box body, and a plurality of dilution water injection ports are provided on the top cover, each of which is connected to a dilution water supply pipe through a water injection valve, the inlet of the dilution water supply pipe is connected to the outlet of a water replenishment pump, and the inlet pipe of the water replenishment pump is connected to the water tank.

7. The collecting tank in the oilfield produced sediment reinjection system according to claim 6, characterized in that: The water replenishment pump is a self-priming pump and is installed on the top cover.

8. The collecting tank in the oilfield produced sediment reinjection system according to claim 1, characterized in that: A rigid frame is arranged around the rectangular box body, and a fence is arranged around the top cover of the rectangular box body.

9. The collecting tank in the oilfield produced sediment reinjection system according to claim 8, characterized in that: An inclined ladder is provided on one side of the rectangular box, and the upper end of the inclined ladder is connected to the opening of the fence.

10. The collecting tank in the oilfield produced sediment reinjection system according to claim 1, characterized in that: A manhole is arranged on the top cover of the rectangular box body, the manhole is close to one side wall of the box body, and a ladder is arranged on the corresponding side wall of the box body.

11. The collecting tank in the oilfield produced sediment reinjection system according to claim 3, characterized in that: The middle section of the sludge discharge hopper is provided with a screen.

12. The collecting tank in the oilfield produced sediment reinjection system according to claim 1, characterized in that: At least two of the warehouse wall vibrators are arranged on the corresponding inclined side walls.

13. The collecting tank in the oilfield produced sediment reinjection system according to any one of claims 1 to 12, characterized in that: A liquid level meter is installed on the side wall of the rectangular box.

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