Construction method of oil well external vapor-liquid collecting device

Abstract

The application discloses a construction method of an oil well outer vapor-liquid collecting device and relates to the technical field of oil well thermal injection. In order to improve environmental protection, the device comprises reinforced concrete arranged outside a casing pipe, the reinforced concrete is buried in the ground, a gravel layer is arranged below the reinforced concrete, a split sheath is arranged at the center position of the bottom of the reinforced concrete, and the split sheath is arranged outside the casing pipe. The construction method of the device comprises the following steps: digging a construction cavity outside the casing pipe at the well mouth; arranging the split sheath outside the casing pipe to avoid contact between the split sheath and the casing pipe and to reserve an annular passage for vapor-liquid to pass through. The oil well outer vapor-liquid collecting device is used for collecting sewage and steam spouted from the annular space of the stratum outside the outer wall of the casing pipe, is a full-closed drainage device, and uses a manifold to convey the upwardly gushing vapor-liquid to a storage equipment, so that the sewage is prevented from overflowing and spouting, and the purpose of protecting the environment is achieved.

Description

Technical Field

[0001] This invention relates to the field of oil well thermal injection technology, and in particular to a construction method for an external gas-liquid collection device for oil wells. Background Technology

[0002] Currently, during steam injection in oil wells, the high steam temperature causes the pipeline temperature to rise, leading to the boiling of formation water and deposited surface water in the shallow layer outside the casing. The boiling wastewater overflows from the bottom surface along the outer wall of the casing, causing overflow and splashing throughout the steam injection process, which is inconvenient for operations. To solve this problem, soil is often used to contain the overflow outside the wellhead, allowing the wastewater to evaporate naturally. While this method limits the amount of wastewater to some extent, it still pollutes the environment and poses certain safety hazards. Therefore, further improvements are needed.

[0003] A search revealed Chinese patent application CN202020861114.6, which discloses an anti-splash device for the bottom of an oil wellhead. This device consists of two main parts: a sealing locking clamp and an anti-splash cover. In use, the anti-splash device is fitted onto the casing at the bottom of the oil wellhead. The sealing locking clamp precisely encloses the threaded connection between the upper and lower casings at the bottom of the wellhead. Then, the sealing locking clamp is secured to the upper and lower casings at the bottom of the wellhead using a first and second locking screw, respectively. Adhesive is then injected into the injection groove through an injection valve to increase the strength of the threaded connection between the upper and lower casings, preventing leakage. Simultaneously, the anti-splash cover, even if surface splashing occurs, can confine the splashing to a certain range, reducing the splash force, narrowing the splash area, and improving the safety factor. The anti-splash device in the aforementioned patent has the following shortcomings: although it limits the amount of splashed liquid to a certain extent, it still causes environmental pollution and poses certain safety hazards. Therefore, it needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an external gas-liquid collection device for oil wells and its construction method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An external gas-liquid collection device for oil wells includes reinforced concrete installed outside the casing. The bottom of the reinforced concrete is buried underground, and a layer of crushed stone is placed below the reinforced concrete. A segmented sheath is installed at the center of the bottom of the reinforced concrete, covering the outside of the casing, with the inner diameter of the segmented sheath larger than the outer diameter of the casing. A segmented packing assembly is installed between the center of the top of the reinforced concrete and the casing. The segmented packing assembly includes two segmented clamps and two segmented clamp-shaped pressure blocks. The outer wall of the segmented clamps is fixed with an arc-shaped protrusion, and the top surface of the segmented clamps is flush with the top surface of the reinforced concrete. The two segmented clamps are symmetrically arranged outside the casing, with two rectangular channels between them. A first guide slope is provided on the side of the segmented clamps closest to the casing. The segmented clamp-type pressure blocks are symmetrically arranged on both sides of the sleeve, and the bottom of the segmented clamp-type pressure blocks is inserted into the gap between the two segmented clamps and the sleeve. The splicing surfaces of the two segmented clamp-type pressure blocks are staggered with the two rectangular channels, and the reinforced concrete body is filled in the rectangular channels. The bottom of the segmented clamp-type pressure block is provided with a second guide slope. Graphite packing is elastically wrapped between the second guide slope, the first guide slope, and the outer wall of the sleeve. The top of the segmented clamp-type pressure block is detachably installed on the top of the segmented clamps by fastening bolts. A cavity is provided between the reinforced concrete and the sleeve. A conveying manifold is provided in the reinforced concrete. The two ends of the conveying manifold are located on the outside of the reinforced concrete and in the cavity, respectively. The gap between the segmented sheath and the sleeve is connected to the conveying manifold through the cavity.

[0007] Preferably, one end of the conveying manifold is connected to a storage tank, a support frame is provided at the bottom of the storage tank, a discharge pipe is provided on the outer wall of the bottom of one end of the storage tank, and a discharge valve body is provided on the discharge pipe for controlling the opening and closing of the discharge pipe.

[0008] Furthermore: a fixing frame for fixing the delivery manifold is provided on one side of the outer wall of the delivery manifold; a pressure gauge and an electric control valve are installed on one of the delivery manifolds; a pressure sensor is installed inside the delivery manifold; the oil well external gas-liquid collection device also includes a control unit, which is electrically connected to the pressure sensor and the electric control valve; and a manual discharge valve is provided on the other delivery manifold.

[0009] A further preferred embodiment: a first heat transfer plate adapted to the shape of the storage tank is installed on the inner wall of the bottom of the storage tank; a second heat transfer plate is provided on the outer walls of both sides of the first heat transfer plate; the second heat transfer plate has a corrugated structure; a transparent plate adapted to the shape of the storage tank is installed on the inner wall of the top of the storage tank; and an evaporation output pipe is provided on the outer wall of the top of one end of the storage tank.

[0010] As a preferred embodiment of the present invention: the inner wall of the evaporation output tube is provided with an annular limiting protrusion, a filter box is inserted into the inner wall of the top of the evaporation output tube, the filter box is a hollow columnar structure, the outer diameter of the filter box is adapted to the inner diameter of the top of the evaporation output tube, a top cover is detachably installed on the top of the filter box, and the outer surface of the filter box is provided with uniformly distributed through holes; the filter box is filled with activated carbon particles.

[0011] As a further preferred embodiment of the present invention: inside the storage tank, an annular sliding seat is rotatably connected to one side of the inner wall of the storage tank, an elastic collar is bonded to the inner wall of the annular sliding seat, a support ring is bonded to the middle position of the elastic collar, an operating rod is slidably connected inside the support ring, an operating disc is fixed to the outer wall of one end of the operating rod by bolts, and a scraping part for scraping off impurities is provided at the other end of the operating rod.

[0012] As a further embodiment of the present invention: the scraping part includes a main scraper and a secondary scraper. The main scraper is fixed to the outer wall of one end of the operating rod by bolts. The secondary scrapers are arranged on both sides of the main scraper, and the outer wall of one side of the two secondary scrapers is respectively provided with a first groove and a second groove, and the first groove and the second groove are arranged alternately.

[0013] Based on the aforementioned scheme: hollow seats are fixed on both sides of the support frame, and an adjustment knob is threadedly connected to the inner wall of the hollow seat. A rotating block is rotatably connected to the bottom outer wall of the adjustment knob, and a universal wheel is mounted on the bottom of the rotating block through a universal wheel mounting seat; the size of the universal wheel is smaller than the inner diameter of the hollow seat.

[0014] Based on the aforementioned solution: the fastening bolt includes a bolt body and a conical head. The bottom of the bolt body has a slot, and the top of the conical head is integrally provided with a protrusion that matches the slot. The conical head is detachably inserted into the slot through the protrusion.

[0015] A construction method for an external vapor-liquid collection device for oil wells includes the following steps:

[0016] S1: Excavate a construction cavity outside the casing at the wellhead;

[0017] S2: Place the segmented sheath on the outside of the casing to avoid contact between the segmented sheath and the casing, and leave an annular channel for the passage of vapor and liquid.

[0018] S3: Lay a layer of crushed stone at the bottom of the construction cavity;

[0019] S4: Tie the steel mesh on site, fix the split clamps to the outside of the casing, and fix the delivery manifold.

[0020] S5: Insert the mold into the gap between the split clamp and the sleeve, and carry out concrete construction to make reinforced concrete;

[0021] S6: Remove the formwork after the concrete has hardened;

[0022] S7: Wrap graphite packing around the outside of the sleeve and insert it into the gap between the split clamp and the sleeve;

[0023] S8: Insert two split-type clamp blocks between the top of the split clamp and the sleeve, and fix the split-type clamp blocks to the split clamp with fastening bolts, and use the deformation of graphite packing to seal.

[0024] S9: Connect the delivery manifold to the vapor-liquid collection system to complete the construction.

[0025] A further preferred embodiment based on the aforementioned scheme is as follows: the tire mold includes two symmetrical segmented tire mold bodies, the top of the segmented tire mold body is provided with a lifting rod, and the bottom sidewall of the segmented tire mold body is adapted to the shape of the first guide slope.

[0026] A further preferred embodiment of the aforementioned scheme is that the construction method also involves an oil well washing fluid, which comprises 10-15% biosurfactant, 3-10% amphoteric surfactant, 5-10% methanol, 1-4% lignin, 0.2%-0.8% bactericide, 0.02%-0.06% ion stabilizer, and the balance being water.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. The external gas-liquid collection device of the present invention is used to collect sewage and steam splashed from the formation annulus outside the casing. It is a fully enclosed diversion device that uses a manifold to transport the upward-flowing gas and liquid to a storage device. In this way, sewage overflow and splashing are avoided, thus achieving the purpose of protecting the environment.

[0029] 2. This invention, through the construction of reinforced concrete, a segmented sheath, and a conveying manifold, can seal the wellhead. When sewage rises due to heat, it is discharged through the conveying manifold, preventing splashing and improving environmental friendliness and safety. The segmented packing assembly allows for installation by first wrapping graphite packing around the outside of the casing, then installing two segmented clamping blocks inside the segmented clamps. Tightening the fastening bolts brings the segmented clamping blocks closer to the segmented clamps, and then using the first and second guide slopes to press the graphite packing towards the inside of the casing to achieve a sealing effect. The graphite packing is a deformable material, ensuring the service life of the entire structure. Furthermore, the segmented structure of the segmented clamping blocks and segmented clamps allows for construction without moving the casing, improving reliability. The rectangular channel enhances the bond strength between the reinforced concrete and the segmented clamps during the concrete preparation process, ensuring sealing. The crushed stone layer provides antifreeze protection, further improving reliability.

[0030] 3. By setting up structures such as storage tanks, sewage can be transported to the storage tank through the delivery manifold when it rises, thereby achieving the purpose of sewage collection and improving practicality and environmental protection; by setting up structures such as pressure gauges and electrically controlled valves, the pressure in the delivery manifold and cavity can be monitored in real time based on pressure sensors. When the pressure is too high, the electrically controlled valve is opened to transport the liquid in the cavity to the storage tank, improving practicality.

[0031] 4. By setting up structures such as a second heat transfer plate and a transparent plate, light energy can be fully utilized, allowing the liquid in the storage tank to be exposed to light and heat transferred by the second and first heat transfer plates, thereby achieving evaporation and being discharged through the evaporation output pipe, thus improving practicality; by setting up a filter box containing activated carbon particles, deodorization can be achieved during the process of liquid evaporation and discharge through the evaporation output pipe, thus improving environmental friendliness.

[0032] 5. By setting up structures such as an operating lever and a scraping part, the scraping part at one end of the operating lever can be controlled by the operating panel to scrape solid impurities in reinforced concrete and discharge them through the discharge pipe, thus improving practicality.

[0033] 6. By setting a main scraper and a secondary scraper, solid impurities inside the storage tank can be scraped. The secondary scraper can be used to clean the inner circumference of the storage tank by rotation. Due to the setting of the first and second slots, the resistance during rotation can be reduced and the scraping effect can be improved. In addition, the first and second slots are staggered, eliminating blind spots and ensuring the cleaning range, so as to clean more thoroughly.

[0034] 7. By incorporating an adjustment knob, hollow base, and casters, the height of the casters can be controlled by rotating the adjustment knob according to actual conditions, thus facilitating the movement and securing of the storage tank and enhancing its practicality.

[0035] 8. By setting a tapered head, it is possible to guide the bolts during installation, which improves convenience. Furthermore, since the tapered head is detachable, it can be added as needed, which increases the flexibility of use. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of an external vapor-liquid collection device for oil wells proposed in this invention;

[0037] Figure 2 This is a cross-sectional structural diagram of a reinforced concrete structure for an external vapor-liquid collection device for oil wells proposed in this invention;

[0038] Figure 3 This is a schematic diagram of the structure of a segmented packing assembly for an external gas-liquid flow collection device for oil wells proposed in this invention;

[0039] Figure 4This is a schematic diagram of the split packing assembly structure of an external gas-liquid flow device for oil wells proposed in this invention.

[0040] Figure 5 This is a cross-sectional schematic diagram of a segmented packing assembly for an external gas-liquid flow device for oil wells, as proposed in this invention.

[0041] Figure 6 This is a schematic diagram of the structure of a segmented mold for an external gas-liquid collection device for oil wells, as proposed in this invention, installed inside a segmented clamp.

[0042] Figure 7 This is a partial cross-sectional structural diagram of the storage tank of an external vapor-liquid collection device for oil wells proposed in this invention;

[0043] Figure 8 This is a cross-sectional schematic diagram of the evaporation output pipe of an external vapor-liquid collection device for oil wells proposed in this invention;

[0044] Figure 9 This is a schematic diagram of the scraper section of an external vapor-liquid collection device for oil wells proposed in this invention;

[0045] Figure 10 This is a cross-sectional schematic diagram of the hollow seat of an external gas-liquid collection device for oil wells proposed in this invention;

[0046] Figure 11 This is a schematic diagram of the structure of an external gas-liquid collection device for oil wells, showing the angle between the first guide inclined plane and the horizontal plane and the second guide inclined plane.

[0047] Figure 12 This is a schematic diagram of the disassembly of the fastening bolts of the external gas-liquid collection device for an oil well, as proposed in Embodiment 3 of the present invention.

[0048] Figure 13 This is a comparison chart showing the evaluation of different schemes used in the construction method of the external gas-liquid collection device for oil wells proposed in this invention;

[0049] Figure 14 This diagram illustrates the relationship between the angles of the first and second guide inclined surfaces and the sealing performance in an external gas-liquid collection device for oil wells proposed in this invention.

[0050] In the diagram: 1 Reinforced concrete, 2 Sleeve, 3 Control panel, 4 Control lever, 5 Storage tank, 6 Evaporation output pipe, 7 Transparent plate, 8 Delivery manifold, 9 Electrically controlled valve, 10 Pressure gauge, 11 Split packing assembly, 12 Manual drain valve, 13 Fixing bracket, 14 Split sheath, 15 Crushed stone layer, 16 Split clamp-type pressure block, 17 Arc-shaped protrusion, 18 Graphite packing, 19 Split clamp, 20 Fastening bolt, 21 First guide ramp, 22 Second guide ramp, 23 Lifting rod, 24 Split-type mold body, 25 second heat transfer plate, 26 first heat transfer plate, 27 hollow seat, 28 support frame, 29 support ring, 30 elastic collar, 31 annular sliding seat, 32 filter box, 33 top cover, 34 annular limiting protrusion, 35 through hole, 36 main scraper, 37 first slot, 38 second slot, 39 auxiliary scraper, 40 universal wheel, 41 universal wheel mounting base, 42 rotating block, 43 adjusting knob, 44 bolt body, 45 slot, 46 protrusion, 47 conical head. Detailed Implementation

[0051] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0052] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0053] In the description of this patent, it should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0054] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0055] Example 1:

[0056] An external gas-liquid collection device for oil wells, such as Figure 1-11As shown, the casing includes a reinforced concrete 1 located outside the sleeve 2. The bottom of the reinforced concrete 1 is buried underground, and a layer of crushed stone 15 is located below the reinforced concrete 1. A segmented sheath 14 is located at the center of the bottom of the reinforced concrete 1, and the segmented sheath 14 is fitted over the outside of the sleeve 2. The inner diameter of the segmented sheath 14 is larger than the outer diameter of the sleeve 2. A segmented packing assembly 11 is located between the center of the top of the reinforced concrete 1 and the sleeve 2. The segmented packing assembly 11 includes two segmented clamps 19 and two segmented clamp-shaped pressure blocks 16. The outer wall of the segmented clamps 19 is welded with an arc-shaped protrusion 17. The top surface of the segmented clamps 19 is flush with the top surface of the reinforced concrete 1. The two segmented clamps 19 are symmetrically arranged on the outside of the sleeve 2. Two rectangular channels are left between the segmented clamps 19. A first guide slope 21 is provided on the side of the segmented clamp 19 near the sleeve 2. Two segmented clamp-shaped pressure blocks 16 are symmetrically arranged on both sides of the sleeve 2, and the bottom of the segmented clamp-shaped pressure blocks 16 are inserted into the gap between the two segmented clamps 19 and the sleeve 2. The splicing surface of the two segmented clamp-shaped pressure blocks 16 is staggered with the two rectangular channels, and the body of the reinforced concrete 1 is filled in the rectangular channels. A second guide slope 22 is provided at the bottom of the segmented clamp-shaped pressure blocks 16. Graphite packing 18 is elastically wrapped between the second guide slope 22, the first guide slope 21 and the outer wall of the sleeve 2. The top of the segmented clamp-shaped pressure blocks 16 is fastened with bolts. The 20 is detachably installed on top of the split-type clamp 19. A cavity is provided between the reinforced concrete 1 and the casing 2. A conveying manifold 8 is provided inside the reinforced concrete 1. The two ends of the conveying manifold 8 are located on the outside of the reinforced concrete 1 and inside the cavity, respectively. The gap between the split-type sheath 14 and the casing 2 is connected to the conveying manifold 8 through the cavity. By setting up the reinforced concrete 1, the split-type sheath 14, and the conveying manifold 8, the wellhead can be sealed. When sewage is heated and rises, it is discharged through the conveying manifold 8, eliminating splashing and improving environmental protection and safety. The split-type packing assembly 11 allows the graphite packing 18 to be wound around the outside of the casing 2 during installation, and then the two split-type clamp blocks 16 are installed on the split-type clamps. Inside the clamp 19, tightening the fastening bolt 20 brings the segmented clamp block 16 closer to the clamp 19. Then, the first guide slope 21 and the second guide slope 22 are used to squeeze the graphite packing 18 towards the inside of the sleeve 2 to achieve a sealing effect. The graphite packing 18 is made of easily deformable material, which ensures the service life of the entire structure. In addition, the segmented clamp block 16 and the segmented clamp 19 are segmented structures, which can be constructed without moving the sleeve 2, thus improving reliability. Due to the rectangular channel, the bonding strength between the reinforced concrete 1 and the segmented clamp 19 can be improved during the preparation of the reinforced concrete 1, ensuring sealing. The crushed stone layer 15 can play a role in preventing freezing, thus improving reliability.

[0057] To facilitate the collection of liquid output from manifold 8; such as Figure 1 As shown, one end of the conveying manifold 8 is connected to a storage tank 5, and a support frame 28 is provided at the bottom of the storage tank 5. A discharge pipe is provided on the outer wall of the bottom of one end of the storage tank 5, and a discharge valve body is provided on the discharge pipe for controlling the opening and closing of the discharge pipe. By setting up structures such as the storage tank 5, sewage can be transported to the storage tank 5 through the conveying manifold 8 when it rises, thereby achieving the purpose of collecting sewage and improving practicality and environmental protection.

[0058] To facilitate control of the flow of manifold 8; such as Figure 2 As shown, a fixing frame 13 for fixing the delivery manifold 8 is provided on the outer wall of one side. A pressure gauge 10 and an electric control valve 9 are installed on one of the delivery manifolds 8. A pressure sensor is installed inside the delivery manifold 8. The oil well external gas-liquid collection device also includes a control unit, which is electrically connected to the pressure sensor and the electric control valve 9. A manual discharge valve 12 is provided on the other delivery manifold 8. By setting up structures such as the pressure gauge 10 and the electric control valve 9, the pressure in the delivery manifold 8 and the cavity can be monitored in real time based on the pressure sensor. When the pressure is too high, the electric control valve 9 is opened to transport the liquid in the cavity to the storage tank 5, which improves the practicality.

[0059] Example 2:

[0060] An external gas-liquid collection device for oil wells, such as Figure 1 , Figure 7 As shown, to facilitate the evaporation of the liquid inside the storage tank 5, this embodiment makes the following improvements based on embodiment 1: A first heat transfer plate 26 adapted to the shape of the storage tank 5 is installed on the inner wall of the bottom of the storage tank 5; a second heat transfer plate 25 is integrally provided on the outer walls of both sides of the first heat transfer plate 26; the second heat transfer plate 25 has a corrugated structure; a transparent plate 7 adapted to the shape of the storage tank 5 is installed on the inner wall of the top of the storage tank 5; an evaporation output pipe 6 is integrally provided on the outer wall of the top of one end of the storage tank 5; by setting the second heat transfer plate 25, transparent plate 7 and other structures, light energy can be fully utilized, so that the liquid inside the storage tank 5 is subjected to light and heat transfer from the second heat transfer plate 25 and the first heat transfer plate 26, thereby achieving evaporation, and is discharged through the evaporation output pipe 6, improving practicality.

[0061] To improve environmental friendliness; such as Figure 7 , Figure 8As shown, the inner wall of the evaporation output pipe 6 is integrally provided with an annular limiting protrusion 34. A filter box 32 is inserted into the inner wall of the top of the evaporation output pipe 6. The filter box 32 has a hollow columnar structure. The outer diameter of the filter box 32 is adapted to the inner diameter of the top of the evaporation output pipe 6. A top cover 33 is detachably installed on the top of the filter box 32. The outer surface of the filter box 32 is provided with evenly distributed through holes 35. The filter box 32 is filled with activated carbon particles. By setting the filter box 32 filled with activated carbon particles, the purpose of deodorization can be achieved during the process of liquid evaporation and discharge from the evaporation output pipe 6, thereby improving environmental protection.

[0062] To facilitate cleaning of storage tank 5; such as Figure 7 As shown, inside the storage tank 5, an annular sliding seat 31 is rotatably connected to one side of the inner wall of the storage tank 5. An elastic collar 30 is bonded to the inner wall of the annular sliding seat 31. A support ring 29 is bonded to the middle of the elastic collar 30. An operating rod 4 is slidably connected inside the support ring 29. An operating disc 3 is fixed to the outer wall of one end of the operating rod 4 by bolts. The other end of the operating rod 4 is provided with a scraping part for scraping off impurities. By setting up the operating rod 4, scraping part and other structures, the scraping part at one end of the operating rod 4 can be controlled by the operating disc 3 to scrape off solid impurities in the reinforced concrete 1 and discharge them through the discharge pipe, thus improving practicality.

[0063] To facilitate cleaning the inner wall of storage tank 5; such as Figure 7 , Figure 9 As shown, the scraping part includes a main scraper 36 and a secondary scraper 39. The main scraper 36 is fixed to the outer wall of one end of the operating rod 4 by bolts. The secondary scrapers 39 are integrally disposed on both sides of the main scraper 36, and the outer wall of one side of the two secondary scrapers 39 is respectively provided with a first groove 37 and a second groove 38, which are staggered. By setting the main scraper 36 and the secondary scraper 39, solid impurities in the storage tank 5 can be scraped, and the inner circumference of the storage tank 5 can be cleaned by rotating the secondary scraper 39. Due to the setting of the first groove 37 and the second groove 38, the resistance during rotation can be reduced and the scraping effect can be improved. Moreover, the staggered distribution of the first groove 37 and the second groove 38 eliminates the cleaning blind spots, ensures the cleaning range, and makes the cleaning more thorough.

[0064] To facilitate the movement of storage tank 5; such as Figure 10As shown, hollow seats 27 are welded to both sides of the support frame 28. An adjustment knob 43 is threadedly connected to the inner wall of the hollow seat 27. A rotating block 42 is rotatably connected to the outer wall of the bottom end of the adjustment knob 43. A universal wheel 40 is mounted on the bottom of the rotating block 42 via a universal wheel mounting seat 41. The size of the universal wheel 40 is smaller than the inner diameter of the hollow seat 27. By setting up structures such as the adjustment knob 43, the hollow seat 27, and the universal wheel 40, the lifting and lowering of the universal wheel 40 can be controlled by rotating the adjustment knob 43 according to the actual situation, thereby facilitating the movement and fixing of the storage tank 5 and improving practicality.

[0065] Example 3:

[0066] An external gas-liquid collection device for oil wells, such as Figure 12 As shown, to improve practicality, this embodiment makes the following improvements based on embodiment 2: The fastening bolt 20 includes a bolt body 44 and a conical head 47. The bottom of the bolt body 44 is provided with a slot 45, and the top of the conical head 47 is integrally provided with a protrusion 46 that matches the slot 45. The conical head 47 is detachably inserted into the slot 45 through the protrusion 46. By providing the conical head 47, it is possible to guide the fastening bolt 20 during installation, which improves convenience. Furthermore, since the conical head 47 is detachable, it can be added as needed, which improves the flexibility of use.

[0067] Example 4:

[0068] A construction method for an external gas-liquid collection device for oil wells, such as Figure 1-10 As shown, it includes the following steps:

[0069] S1: Excavate a construction cavity outside the casing 2 at the wellhead;

[0070] S2: Slide the split sheath 14 over the outside of the sleeve 2 to prevent the split sheath 14 from contacting the sleeve 2 and leave an annular channel for vapor and liquid to pass through.

[0071] S3: Lay a 15-inch layer of crushed stone at the bottom of the construction cavity;

[0072] S4: Tie the steel mesh on site, and fix the split clamp 19 to the outside of the sleeve 2, and fix the conveying manifold 8.

[0073] S5: Insert the mold into the gap between the split clamp 19 and the sleeve 2, and carry out concrete construction to make reinforced concrete 1;

[0074] S6: Remove the formwork after the concrete has hardened;

[0075] S7: Wrap graphite packing 18 around the outside of sleeve 2 and insert it into the gap between the split clamp 19 and sleeve 2;

[0076] S8: Insert two split-type clamp blocks 16 between the top of the split clamp 19 and the sleeve 2, and fix the split-type clamp blocks 16 to the split clamp 19 by fastening bolts 20, and use the deformation of graphite packing 18 to seal.

[0077] S9: Connect the delivery manifold 8 to the vapor-liquid collection system to complete the construction.

[0078] The mold includes two symmetrical segmented mold bodies 24. A lifting rod 23 is provided on the top of each segmented mold body 24. The bottom sidewall of each segmented mold body 24 is adapted to the shape of the first guide slope 21. By setting the mold, it can play a role in the concrete construction step of reinforced concrete 1, and reserve space inside the segmented clamp 19, which is conducive to subsequent installation and improves reliability.

[0079] The construction method also relates to an oil well washing fluid, which comprises 10-15% biosurfactant, 3-10% amphoteric surfactant, 5-10% methanol, 1-4% lignin, 0.2%-0.8% bactericide, 0.02%-0.06% ion stabilizer, and the balance being water.

[0080] Experiment 1:

[0081] To verify the effect of the external vapor-liquid collection device of the present invention on improving the working environment, two oil wells were selected. One well was used as an experimental example and the external vapor-liquid collection device of the present invention was used for construction. The other well was used as a control example, and soil was piled up to contain the splashed wastewater. After the steam injection was completed, the on-site environment was evaluated, and the following conclusions were drawn:

[0082] Environmental cleanliness rating 97 31 Ambient air quality score 95 32 Safety factor scoring during hot injection 99 45

[0083] As can be seen from the above, the external vapor-liquid collection device of the present invention has substantial improvements in environmental cleanliness, air quality and work safety compared with the conventional solution of the comparative example. The external vapor-liquid collection device of the present invention has good sealing performance during the steam injection process, and there is no phenomenon of sewage splashing. It also eliminates the phenomenon of sewage splashing and injuring people due to excessively high temperature.

[0084] Experiment 2:

[0085] To verify the sealing effect of the segmented packing assembly 11 of the present invention, the first guide slope 21 of the segmented clamp 19 and the second guide slope 22 of the segmented clamp block 16 were processed to different angles and constructed. A segmented clamp 19 without the first guide slope 21 (i.e., the inner circumferential wall is perpendicular to the horizontal plane) and a segmented clamp block 16 without the second guide slope 22 (i.e., the bottom outer wall is parallel to the horizontal plane) were selected as control examples to test the sealing effect.

[0086]

[0087] As can be seen from the above, the angles between the first guide slope, the second guide slope and the horizontal plane have a significant impact on the sealing performance. The sealing performance is optimal when the angle between the first guide slope and the horizontal plane is between 65° and 75°, and the angle between the second guide slope and the horizontal plane is between 20° and 30°. Therefore, it is preferable to control the angle between the first guide slope and the horizontal plane to be between 65° and 75°, and the angle between the second guide slope and the horizontal plane to be between 20° and 30°.

[0088] The above description represents a preferred embodiment of the present invention, but it is not the only specific embodiment of the present invention. The scope of protection of the present invention is not limited thereto. Any equivalent or equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present invention, in combination with existing technology or common knowledge, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A construction method for an external gas-liquid collection device for oil wells, characterized in that, The external gas-liquid collection device for the oil well includes: a reinforced concrete (1) installed outside the casing (2), the bottom of which is buried underground, and a gravel layer (15) is installed below the reinforced concrete (1). A segmented sheath (14) is installed at the center of the bottom of the reinforced concrete (1), which is fitted over the casing (2), and the inner diameter of the segmented sheath (14) is larger than the outer diameter of the casing (2). A segmented packing assembly (11) is installed between the center of the top of the reinforced concrete (1) and the casing (2). The segmented packing assembly (11) includes two segmented clamps (19) and two... The split-type clamp (16) has an arc-shaped protrusion (17) welded to the outer wall of the split-type clamp (19). The top surface of the split-type clamp (19) is flush with the top surface of the reinforced concrete (1). The two split-type clamps (19) are symmetrically arranged on the outside of the sleeve (2), and two rectangular channels are left between the two split-type clamps (19). The split-type clamp (19) is provided with a first guide slope (21) on the side near the sleeve (2). The two split-type clamp blocks (16) are symmetrically arranged on both sides of the sleeve (2), and the bottom of the split-type clamp blocks (16) is inserted into the two split-type clamps (19) and the sleeve. In the gap between (2), the splicing surfaces of the two segmented hoop-shaped pressure blocks (16) are staggered with the two rectangular channels, and the body of the reinforced concrete (1) is filled in the rectangular channels. The bottom of the segmented hoop-shaped pressure block (16) is provided with a second guide slope (22). Graphite packing (18) is elastically wrapped between the second guide slope (22), the first guide slope (21) and the outer wall of the sleeve (2). The top of the segmented hoop-shaped pressure block (16) is detachably installed on the top of the segmented clamp (19) by fastening bolts (20). A cavity is provided between the reinforced concrete (1) and the sleeve (2). A conveying manifold (8) is installed inside the reinforced concrete (1). The two ends of the conveying manifold (8) are located outside the reinforced concrete (1) and inside the cavity, respectively. The gap between the split sheath (14) and the sleeve (2) is connected to the conveying manifold (8) through the cavity. A storage tank is connected to one end of the conveying manifold. An annular sliding seat is rotatably connected to the inner wall of one side of the storage tank. An elastic ring is bonded to the inner wall of the annular sliding seat. A support ring is bonded to the middle of the elastic ring. An operating rod is slidably connected inside the support ring. An operating disc is fixed to the outer wall of one end of the operating rod by bolts. A scraping part for scraping off impurities is provided at the other end of the operating rod. The construction method includes the following steps: S1: A construction cavity is excavated outside the casing (2) at the wellhead; S2: Place the split sheath (14) on the outside of the sleeve (2) to avoid contact between the split sheath (14) and the sleeve (2), and leave an annular channel for the passage of vapor and liquid; S3: Lay a layer of crushed stone (15) at the bottom of the construction cavity; S4: Tie the steel mesh on site, and fix the split clamp (19) to the outside of the sleeve (2) and fix the delivery manifold (8); S5: Insert the mold into the gap between the split clamp (19) and the sleeve (2) to carry out concrete construction and make reinforced concrete (1); S6: Remove the formwork after the concrete has hardened; S7: Wrap graphite packing (18) around the outside of the sleeve (2) and insert it into the gap between the split clamp (19) and the sleeve (2); S8: Insert two split clamp-type pressure blocks (16) between the top of the split clamp (19) and the sleeve (2), and fix the split clamp-type pressure blocks (16) on the split clamp (19) by fastening bolts (20), and use the deformation of graphite packing (18) to seal. S9: Connect the delivery manifold (8) to the vapor-liquid collection system to complete the construction.

2. The construction method of an external gas-liquid collection device for oil wells according to claim 1, characterized in that, The tire mold includes two symmetrical segmented tire mold bodies (24), with a lifting rod (23) provided on the top of the segmented tire mold body (24), and the bottom sidewall of the segmented tire mold body (24) is adapted to the shape of the first guide slope (21).

3. The construction method of an external vapor-liquid collection device for oil wells according to claim 2, characterized in that, The invention also relates to an oil well washing fluid, which comprises 10-15% biosurfactant, 3-10% amphoteric surfactant, 5-10% methanol, 1-4% lignin, 0.2%-0.8% bactericide, 0.02%-0.06% ion stabilizer, and the balance being water.

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