Circulating flushing and collecting device for well repair in oil field

Abstract

The utility model discloses a circulating flushing and collecting device for oil field well repair, which comprises a rectangular skid-mounted base, a cuboid frame is welded on the skid-mounted base, steel plates are welded on the bottom and the periphery of the cuboid frame to form a box body, and a sand setting chamber, a primary filter chamber, a secondary filter chamber and a clean chamber are sequentially arranged along the length direction of the box body. A sand setting small tank is arranged in the sand setting chamber, the upper edge of the sand setting small tank is higher than the upper end opening of the sand setting chamber, a long-strip-shaped sand setting overflow opening is formed in the upper portion of the side wall, facing the first-stage filtering chamber, of the sand setting small tank, a U-shaped aqueduct with an upward opening is welded to the sand setting overflow opening, and the bottom of the U-shaped aqueduct is a liquid guiding slope plate with the tail end inclining downwards and extending to the position above the first-stage filtering chamber; and lifting lugs are respectively welded at four corners of the small sand setting tank. After the well fluid is settled and filtered in multiple stages, suspended solids such as fine sand, micro-particles and crude oil can be completely filtered, so that the water quality meets the condition that the well fluid enters a shaft again, the construction efficiency is improved, and underground faults are reduced.

Description

Technical Field

[0001] The utility model relates to a device for treating sewage and wastewater, in particular to a circulating flushing and collecting device for oilfield workover, belonging to the technical field of workover auxiliary equipment. Background Art

[0002] At present, the circulating tank mainly used in sand washing and drilling grinding processes is an open tank lacking corresponding filtering functions, which cannot effectively remove dirt and solid particles in well fluid. Therefore, it is very easy to block downhole tools due to dirt, resulting in construction complication or even construction failure. Even if some circulating tanks are added with filtering functions, the sedimentation and filtering systems of existing workover circulating tanks are not precise enough to completely separate impurities such as suspended substances, and the water quality purification is not thorough enough. In addition, when dealing with impurities such as sediment, the construction difficulty is relatively large. Content of the Utility Model

[0003] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the application, to avoid obscuring the purpose of this part, the abstract, and the title, and such simplifications or omissions shall not be used to limit the scope of the utility model.

[0004] In view of the above and / or problems existing in the prior art, the present utility model is proposed.

[0005] The purpose of the utility model is to overcome the problems existing in the prior art and provide a circulating flushing and collecting device for oilfield workover. After the well fluid is sedimented and filtered through multiple stages, fine sand, micro-particles, and suspended substances such as crude oil can be filtered clean, making the water quality meet the conditions for re-entering the wellbore, thereby improving the construction efficiency and reducing downhole failures.

[0006] To solve the above technical problems, a circulating flushing and collecting device for oilfield workover of the utility model includes a rectangular skid-mounted base. A cuboid frame is welded on the skid-mounted base. The bottom and around the cuboid frame are welded with steel plates to form a box body. A sand settling chamber, a primary filtering chamber, a secondary filtering chamber, and a clean chamber are arranged in sequence along the length direction of the box body. A sand settling small tank is placed in the sand settling chamber. The upper edge of the sand settling small tank is higher than the upper port of the sand settling chamber, and a long-strip-shaped sand settling overflow port is arranged on the upper part of the wall facing the primary filtering chamber. A U-shaped trough with an upward opening is welded at the sand settling overflow port. The bottom of the U-shaped trough is a liquid guiding inclined plate with the end inclined downward and extending above the primary filtering chamber. Lifting lugs are respectively welded at the four corners of the sand settling small tank.

[0007] Further, a liquid inlet pipe is fixed to the outer wall of the liquid inlet end of the box body through a pipe support. The lower end of the liquid inlet pipe is connected to the upper port of a right-angle buffer elbow. The upper end of the liquid inlet pipe is connected to a buffer elbow that can rotate. The outlet of the buffer elbow is located above the small sand settling tank.

[0008] Further, the sand settling chamber and the primary filtration chamber are separated by a closed partition board. The upper part between the primary filtration chamber and the secondary filtration chamber is separated from each other by a primary filtration upper sealing plate. A primary filtration hole is provided below the primary filtration upper sealing plate.

[0009] Further, primary filter plates are respectively provided on both sides in the width direction of the primary filtration hole. A primary detachable filter screen covers the middle part of the primary filtration hole. The filtration precision of the primary filter plates and the primary detachable filter screen is 0.5 mm.

[0010] Further, the two side frames of the primary detachable filter screen are limited in filter screen buckles. The roots of the filter screen buckles are welded to corresponding auxiliary columns.

[0011] Further, the filter screen buckles are short angle steels extending vertically. The upper ends of each short angle steel are bent outwards to form guiding heads. The free ends of the left and right short angle steels extend out towards each other to form a drawing slot.

[0012] Further, the secondary filtration chamber and the clean chamber are separated from each other by a secondary filter plate. The slits of the secondary filter plate extend vertically and the filtration precision is 0.2 mm.

[0013] Further, an emergency discharge port is provided at a position near the side wall of the box body at the lower part of the secondary filter plate. An emergency gate plate covers the emergency discharge port. The two sides of the emergency gate plate are limited between gate plate limiting angle steels. The upper ends of the two gate plate limiting angle steels are bent outwards to form guiding slopes.

[0014] Further, a lifting ear or a hanging hole is provided at the top of the emergency gate plate. A lifting handle that can lift the emergency gate plate is suspended on the box body.

[0015] Further, the volume of the secondary filtration chamber is larger than the volumes of the primary filtration chamber and the clean chamber. A sledge extending from the skid-mounted base to the upper part of the box body is welded to one side of the box body. A drain port is provided in the middle of the front side wall of the clean chamber and a gate valve is installed. The outlet of the gate valve is connected with a quick connector.

[0016] Further, parallel longitudinal I-beams are provided on both sides of the skid-mounted base. The two longitudinal I-beams are connected into a whole by multiple transverse I-beams. Thick-walled steel pipes parallel to the transverse I-beams are respectively provided at the front part and the rear part of the skid-mounted base. The two sides of the thick-walled steel pipes respectively extend out of the longitudinal I-beams and round plates with enlarged diameters are respectively welded to the outer ends.

[0017] Further, a sand settling chamber discharge port is provided at the lower end of the sand settling chamber, a total discharge port is provided at the lower end of the clean room, and a plug is screwed to the outer ports of the sand settling chamber discharge port and the total discharge port respectively, or a valve is installed.

[0018] Compared with the prior art, the present utility model has achieved the following beneficial effects: 1. The sewage first enters the settling tank of the well repair circulation device, and the particulate matters such as sand and gravel can be settled by gravity in the settling area. After being filtered by two different levels, the impurities such as suspended matters, fine sand and micro particulate matters can be separated from the water, effectively achieving the purpose of purifying the water quality, ensuring the smooth completion of the construction. The hierarchical filtration is more meticulous, scientific and practical, and can effectively reduce the occurrence of sticking accidents caused by the dirty circulating tank during the operation;

[0019] 2. The lifting lugs welded at the four corners of the settling tank can easily lift the settling tank out of the box body, making the cleaning work more time-saving, labor-saving, safe and reliable;

[0020] 3. During the well repair process, when the secondary filter plate is seriously blocked, the emergency gate can be opened to ensure the smooth progress of production;

[0021] 4. The whole is skid-mounted, which is convenient for overall displacement and hoisting, and is convenient for transfer and sharing among various wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. The drawings are only for reference and illustration, and are not used to limit the present utility model. Among them:

[0023] Figure 1 is the front view of the circulating flushing and collecting device for oilfield well repair of the present utility model;

[0024] Figure 2 is Figure 1 the top view of;

[0025] Figure 3 is Figure 1 the three-dimensional view of;

[0026] Figure 4 is Figure 1 the right view of;

[0027] Figure 5 is Figure 1 the left view of;

[0028] Figure 6 is Figure 1 a sectional view along A-A in;

[0029] Figure 7 is the frame diagram in the present utility model;

[0030] Figure 8 is the three-dimensional view of the sand settling small tank in the present utility model;

[0031] In the figure: 1. skid-mounted base; 1a. longitudinal I-beam; 1b. transverse I-beam; 1c. thick-walled steel pipe; 1d. round plate; 2. cuboid frame; 3. box body; 4. sand settling chamber; 4a. partition board; 4b. sand settling chamber drain opening; 5. sand settling small tank; 5a. sand settling overflow port; 5b. U-shaped flume; 5c. lifting lug; 6. primary filtration chamber; 6a. primary filtration upper sealing plate; 6b. primary filtration plate; 6c. primary detachable filter screen; 6d. filter screen buckle; 6e. auxiliary column; 7. secondary filtration chamber; 7a. secondary filtration plate; 7b. emergency gate; 7c. gate limit angle steel; 7d. lifting handle; 8. clean room; 8a. gate valve; 8b. total drain opening; 9. sledge; 10. right-angle buffer elbow; 11. liquid inlet pipe; 12. buffer elbow. Specific embodiments

[0032] In the following description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating that the device must have a specific orientation.

[0033] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below with reference to specific drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model.

[0035] Such as Figures 1 to 8As shown in the figure, the circulating flushing and collecting device for oilfield workover of the utility model comprises a skid-mounted base 1. On both sides of the skid-mounted base 1, there are longitudinal I-beams 1a parallel to each other. Between the two longitudinal I-beams 1a, they are connected into one body by multiple transverse I-beams 1b. Between the ends of the two longitudinal I-beams 1a, there is a welded pedal; at the front and rear parts of the skid-mounted base 1, there are thick-walled steel pipes 1c parallel to the transverse I-beams 1b respectively. On both sides of the thick-walled steel pipes 1c, they extend out of the longitudinal I-beams 1a respectively as traction ends. At the outer ends of the thick-walled steel pipes 1c, there are welded round plates 1d with enlarged diameters to prevent the steel wire ropes from slipping off. Both the longitudinal I-beams 1a and the transverse I-beams 1b adopt 25#B I-beams, and the size of the skid-mounted base is 8320mm * 2300mm * 250mm.

[0036] A cuboid frame 2 is welded on the skid-mounted base 1. The four-corner columns are made of 120mm * 60mm * 4mm square tubes, and the other position columns and crossbeams are made of 60mm * 60mm * 4mm square tubes; the partition plate 4a is seamlessly welded with a Q235B steel plate with a thickness of 5mm, which has good pressure resistance and impact resistance and does not deform after long-term use.

[0037] The bottom and the periphery of the cuboid frame 2 are welded with steel plates to form a box body 3. The size of the box body is 7500mm * 2200mm * 1300mm, and the net volume is about 15m³. The applicable environmental temperature is -29°C to +50°C. All components of the whole have good performance and meet the requirements of construction operations. A plow 9 extending from the skid-mounted base 1 to the upper part of the box body 3 is welded on one side of the box body 3.

[0038] Along the length direction of the box body 3, there are successively a sand settling chamber 4, a primary filtration chamber 6, a secondary filtration chamber 7 and a clean chamber 8. The volume of the secondary filtration chamber 7 is larger than the volumes of the primary filtration chamber 6 and the clean chamber 8. The outer surface of the box body 3 is sandblasted and derusted to reach Sa2.5 level in GB / T8923.1, and the surface is painted for anti-corrosion: the first layer is sprayed with an anti-rust primer, and the coating is 60μm; the second layer is sprayed with a gray topcoat, and the coating is 60μm. Red marks are sprayed on both sides: one side is "Flushing Circulation Tank", and the other side is "No Smoking".

[0039] A small sand settling tank 5 is placed in the sand settling chamber 4. The net volume of the small sand settling tank 5 is about 3m³. The upper edge of the small sand settling tank 5 is higher than the upper port of the sand settling chamber 4. On the upper part of the wall of the small sand settling tank 5 facing the primary filtration chamber 6, there is a long strip-shaped sand settling overflow port 5a. At the sand settling overflow port 5a, there is a U-shaped flume 5b with an upward opening. The bottom of the U-shaped flume 5b is a liquid guiding slope plate with the end downward inclined and extending above the primary filtration chamber 6. The size of the liquid guiding slope plate is 800m × 150mm.

[0040] The outer wall of the liquid inlet end of the box body 3 is fixed with a liquid inlet pipe 11 through a pipe support. The lower end of the liquid inlet pipe 11 is connected to the upper port of the right-angled buffer elbow 10, and the upper end of the liquid inlet pipe 11 is connected with a rotatable buffer elbow 12. The outlet of the buffer elbow 12 is located above the sand settling small tank 5.

[0041] The inlet of the right-angled buffer bend is the water inlet, and the well fluid sewage to be treated enters the sedimentation small tank through the right-angled buffer elbow 10, the liquid inlet pipe 11 and the buffer elbow 12. When the well fluid sewage after buffering enters the sand settling small tank 5, the water flow is stable, avoiding splashing everywhere.

[0042] The sedimentation small tank uses the gravity effect to make particulate matters such as sand and gravel settle in the water. When the well fluid sewage enters the sedimentation small tank, due to the gravity effect, the sand and gravel in the water will gradually settle to the bottom, forming a layer of silt. The water with preliminary filtered impurities will flow out from the U-shaped flume 5b at the upper part of the sedimentation small tank and enter the primary filtration chamber 6.

[0043] Lifting lugs 5c are respectively welded at the four corners of the sand settling small tank 5. When it is necessary to clean the silt at the bottom of the small tank later, the sand settling small tank 5 can be lifted out of the sand settling chamber 4 for cleaning through the lifting lugs 5c at the four corners. There is a certain gap between the sand settling small tank 5 and the sand settling chamber 4, and there will be no interference during the lifting process. Before lifting, rotate the buffer elbow 12 to make its outlet face outwards to avoid forming an obstacle.

[0044] A sand settling chamber drain port 4b is provided at the lower end of the sand settling chamber 4. A plug is screwed at the outer port of the sand settling chamber drain port 4b. Removing the plug facilitates the cleaning of the sand settling chamber 4.

[0045] The sand settling chamber 4 and the primary filtration chamber 6 are separated by a closed partition 4a. The upper parts between the primary filtration chamber 6 and the secondary filtration chamber 7 are separated from each other by a primary filtration upper sealing plate 6a. A primary filtration hole is provided below the primary filtration upper sealing plate 6a. Primary filtration plates 6b are respectively provided on both sides in the width direction of the primary filtration hole, and a primary detachable filter screen 6c covers the middle of the primary filtration hole. The two side frames of the primary detachable filter screen 6c are limited in the filter screen fasteners 6d, and the roots of the filter screen fasteners 6d are welded on the corresponding auxiliary columns 6e. The filter screen fasteners 6d are short angle steels extending vertically. The upper ends of each short angle steel are bent outwards to form guiding heads for facilitating smooth insertion, and the free ends of the left and right short angle steels extend towards each other to form a drawing slot.

[0046] The filtration precision of the primary filtration plates 6b and the primary detachable filter screen 6c is 0.5 mm. The water with preliminary filtered impurities enters the primary filtration chamber 6, and can filter out suspended matters such as oil in the water to make it cleaner. The filtered water will enter the secondary filtration chamber 7. The primary detachable filter screen 6c in the primary filtration area is detachable, which is convenient for cleaning the attached oil stains and area cleaning later. The seam openings of the primary filtration plates 6b extend vertically for easy cleaning.

[0047] The secondary filter chamber 7 and the clean room 8 are separated from each other by the secondary filter plate 7a. The slits of the secondary filter plate 7a extend vertically, and the filtering accuracy is 0.2mm. After the sedimentation of sand and stones and the filtration of oil and other pollutants, the well liquid sewage enters the more refined secondary filter chamber 7. The fine sand and micro-particles in the water can be filtered out, and the clean water will flow into the clean room 8.

[0048] An emergency discharge port is provided at the lower part of the secondary filter plate 7a near the side wall of the box body, and the emergency discharge port is covered with an emergency gate plate 7b. The two sides of the emergency gate plate 7b are limited between the gate plate limiting angle steels 7c. The lower ends of the two gate plate limiting angle steels 7c are welded to the bottom plate, and the upper ends of the two gate plate limiting angle steels 7c are bent outward to form a guide slope to facilitate smooth insertion.

[0049] A lifting ear or lifting hole is provided on the top of the emergency gate 7b, and a lifting handle 7d is hung on the box body, so that the emergency gate 7b can be lifted by the lifting handle 7d when needed, or the emergency gate 7b can be lifted by a rope tied to the top.

[0050] After multiple filtrations, the sewage becomes clean water and is discharged in the clean room 8. A drain port is provided in the middle of the front side wall of the clean room 8 and a gate valve 8a is installed. The outlet of the gate valve 8a is connected with a quick connector for quick connection with an external hose. The user can adjust the drainage volume according to his or her requirements. The treated water can be reused or discharged into the environment.

[0051] A total discharge port 8b is provided at the lower end of the clean room 8, and a plug or a valve is screwed to the outer port of the total discharge port 8b. When cleaning at a later stage, the primary detachable filter screen 6c and the emergency gate 7b can be lifted up for overall cleaning.

[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 methods 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 circulating flushing and collecting device for oilfield workover, comprising a rectangular skid-mounted base, characterized in that: A cuboid frame is welded on the skid-mounted base. Steel plates are welded to the bottom and around the cuboid frame to form a box body. Along the length direction of the box body, a sand settling chamber, a primary filtration chamber, a secondary filtration chamber and a clean room are arranged in sequence. A small sand settling tank is placed in the sand settling chamber. The upper edge of the small sand settling tank is higher than the upper port of the sand settling chamber, and a strip-shaped sand settling overflow port is arranged on the upper part of the side wall facing the primary filtration chamber. A U-shaped trough with an upward opening is welded at the sand settling overflow port. The bottom of the U-shaped trough is a liquid guiding slope plate with the end inclined downward and extending above the primary filtration chamber. Lifting lugs are respectively welded at the four corners of the small sand settling tank.

2. The circulating flushing and collecting device for oilfield workover according to claim 1, wherein: A liquid inlet pipe is fixed on the outer wall of the liquid inlet end of the box body through a pipe support. The lower end of the liquid inlet pipe is connected to the upper port of a right-angle buffer elbow. The upper end of the liquid inlet pipe is connected with a rotatable buffer elbow. The outlet of the buffer elbow is located above the small sand settling tank.

3. The circulating flushing and collecting device for oilfield workover according to claim 1, characterized in that: The sand settling chamber and the primary filtration chamber are separated by a closed partition plate. The upper part between the primary filtration chamber and the secondary filtration chamber is separated from each other by a primary filtration upper sealing plate. A primary filtration hole is arranged below the primary filtration upper sealing plate.

4. The circulating flushing and collecting device for oilfield workover according to claim 3, wherein: Primary filtration plates are respectively arranged on both sides in the width direction of the primary filtration hole. A primary detachable filter screen covers the middle part of the primary filtration hole. The filtration precision of the primary filtration plates and the primary detachable filter screen is 0.5 mm.

5. The circulating flushing and collecting device for oilfield workover according to claim 4, characterized in that: The two side frames of the primary detachable filter screen are limited in filter screen fasteners. The roots of the filter screen fasteners are welded on the corresponding auxiliary columns.

6. The circulating flushing and collecting device for oilfield workover according to claim 5, characterized in that: The filter screen fasteners are short angle steels extending vertically. The upper ends of each short angle steel are bent outward to form guide heads. The free ends of the left and right short angle steels extend out towards each other to form a drawing slot.

7. The circulating flushing and collecting device for oilfield workover according to claim 4, wherein: The secondary filtration chamber and the clean room are separated from each other by a secondary filtration plate. The slits of the secondary filtration plate extend vertically, and the filtration precision is 0.2 mm.

8. The circulating flushing and collecting device for oilfield workover according to claim 7, characterized in that: An emergency discharge port is arranged at the lower part of the secondary filtration plate near the side wall of the box body. An emergency gate plate covers the emergency discharge port. Both sides of the emergency gate plate are limited between gate plate limiting angle steels. The upper ends of the two gate plate limiting angle steels are bent outward to form guide slopes.

9. The circulating flushing and collecting device for oilfield workover according to claim 8, characterized in that: A lifting ear or a lifting hole is arranged at the top of the emergency gate plate. A lifting handle capable of lifting the emergency gate plate is suspended on the box body.

10. The circulating flushing and collecting device for oilfield workover according to claim 1, wherein: The volume of the secondary filtration chamber is larger than the volumes of the primary filtration chamber and the clean room. A crawler extending from the skid-mounted base to the upper part of the box body is welded on one side of the box body. A drain port is arranged in the middle of the front side wall of the clean room and a gate valve is installed. The outlet of the gate valve is connected with a quick connector.

11. The circulating flushing and collecting device for oilfield workover according to claim 1, wherein: Longitudinal I-beams parallel to each other are arranged on both sides of the skid-mounted base. The two longitudinal I-beams are connected into a whole by multiple transverse I-beams. Thick-walled steel pipes parallel to the transverse I-beams are respectively arranged at the front and rear parts of the skid-mounted base. Both sides of the thick-walled steel pipes extend out of the longitudinal I-beams and enlarged round plates are respectively welded at the outer ends.

12. The circulating flushing and collecting device for oilfield workover according to claim 1, characterized in that: A sand settling chamber discharge port is arranged at the lower end of the sand settling chamber. A total discharge port is arranged at the lower end of the clean room. Plug heads are respectively screwed at the outer ports of the sand settling chamber discharge port and the total discharge port, or valves are installed.

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