Device and method for cleaning the interior of underground oil pipes

Abstract

The present invention relates to the technical field of oil pipe cleaning in well repair operations, and is a device and method for cleaning the interior of an underground oil pipe. The device comprises a cleaning box, a water divider, a movable seat, a plug plate, a steel ball, and a steel wire rope. The water divider is provided on the inner side of the right side of the cleaning box. The device has a reasonable and compact structure. By providing the steel ball, the device can play a role in clearing the pipe when cleaning the oil pipe. At the same time, when the steel ball moves in the oil pipe under the action of steam, the steam can quickly melt the wax on the inner wall of the oil pipe, thereby improving the cleaning efficiency. The plug plate not only facilitates the movement of the steel ball into the corresponding cleaning pipe, but also facilitates the flow of steam into the corresponding cleaning pipe. The provision of the rope reel and the steel wire rope facilitates the retraction of the steel ball into the water divider after the oil pipe is cleaned, thereby reducing the labor intensity of workers, controlling the pollution source generated by underground oil pipe cleaning, ensuring that oil and water do not fall to the ground during the underground cleaning operation, and reducing the generation of oily sludge. The device has the characteristics of safety, labor saving, simplicity, and high efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe cleaning in well repair operations, and relates to a device and method for cleaning the inside of an oil pipe. Background Art

[0002] Well workover is an essential component of oilfield development and production. Many oilfields are currently entering the middle and late stages of development, making oil recovery increasingly challenging and the workover task increasingly arduous. Workover has become a crucial means of ensuring stable and high production in most oilfields. However, due to various factors, workover technology has long been slow to develop and is not in line with current requirements. The traditional open-type, underground cleaning method used in workover operations has numerous drawbacks, including significant steam heat energy waste, which dissipates significantly, failing to melt wax and remove scale. This results in low cleaning efficiency, and even slow progress when using two steam vehicles simultaneously to clean oil pipelines with high levels of wax and scale. Operating procedures require that underground cleaning and pipe cleaning be performed simultaneously, but these operations are poorly integrated, with pipe cleaning gauges often flying far out of the pipeline, making them laborious and laborious to retrieve and reinserte. Furthermore, wastewater from underground cleaning can splash or flow onto the surface, and the removed oil and water are dispersed by the wind and cannot be recovered, contaminating a large area at the wellsite. Summary of the Invention

[0003] The present invention provides an internal device and method for underground oil cleaning pipes, which overcome the shortcomings of the above-mentioned existing technologies and can effectively solve the problems of serious waste of steam heat energy, low underground cleaning operation efficiency, and waste liquid splashing or flowing out to the ground, causing large pollution areas in the well site.

[0004] One of the technical solutions of the present invention is achieved through the following measures: an internal device of an oil cleaning pipe, including a cleaning box, a water divider, a movable seat, a plug plate, a steel ball and a steel wire rope. A water divider is provided on the inner side of the right part of the cleaning box, and a movable seat for moving the water divider left and right and up and down is installed on the upper side of the water divider. A rope winding shaft is installed in the front of the water divider. Several cleaning pipes are fixedly connected at intervals at the front and rear of the left side of the water divider corresponding to the rear position of the rope winding shaft. A plug plate is sealed and installed on the water divider corresponding to each cleaning pipe position. Each plug plate is inclined from left to right and from back to front. A sealing hole matching the plug plate is provided on the right side of the cleaning pipe. A steel ball is provided on the inner side of the right end of the cleaning pipe located in the front, and the steel ball is connected to the first end of the steel wire rope. The second end of the steel wire rope is fixedly connected to the rope winding shaft after being wound several times on the rope winding shaft.

[0005] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions:

[0006] As a preferred embodiment, the left end of the rope winding shaft can be rotatably installed on the inner side of the left part of the water divider, and the right end of the rope winding shaft is sealed and passed through the right side of the water divider and is located on the right side of the water divider. A first rotating handwheel is fixedly installed on the outer side of the right end of the rope winding shaft.

[0007] As another preferred embodiment, the rope winding shaft can be rotatably installed on the upper front side of the water divider, and a rope threading hole for threading a wire rope is provided on the upper side of the water divider corresponding to the middle position of the rope winding shaft, and a second rotating handwheel is fixedly installed on the outer side of the right end of the rope winding shaft.

[0008] The upper side of the water divider corresponding to each cleaning pipe position can be provided with a strip-shaped mounting hole that is connected inside and outside. The mounting holes are inclined from left to right and from back to front. At least one layer of sealing gasket is installed on the upper side of the water divider corresponding to each mounting hole position from top to bottom. The sealing gasket includes a front sealing strip that is sealingly fixedly installed at the front of the mounting hole and a rear sealing strip that is sealingly fixedly installed at the rear of the mounting hole. The front side of the rear sealing strip and the rear side of the front sealing strip are in contact with each other. The lower end of the plug-in plate passes through the sealing gasket and the mounting hole in turn and is installed in the water divider.

[0009] A sealing hole corresponding to the mounting hole may be provided on the upper right side of the above-mentioned cleaning pipe, and at least one layer of sealing blocks is installed on the sealing hole from top to bottom. The sealing block includes a left sealing strip that is sealingly fixedly installed on the left part of the sealing hole and a right sealing strip that is sealingly fixedly installed on the right part of the sealing hole. The right side of the left sealing strip and the left side of the right sealing strip are in contact with each other.

[0010] A plurality of sealing ring grooves may be provided on the outer side of the left end of the cleaning pipe corresponding to the left side of the sealing hole, and each sealing ring groove is provided with a sealing ring.

[0011] A gap may be provided between the outer side of the steel ball and the inner side of the cleaning tube.

[0012] The lower inner wall of the cleaning box can be recessed to form a drainage box, and a drainage hole communicating with the inside and outside is provided in the center of the drainage box. A drainage valve is installed on the outside of the cleaning box corresponding to the position of the drainage hole.

[0013] The second technical solution of the present invention is achieved by the following measures: A method for cleaning the inside of an oil pipe is carried out according to the following steps:

[0014] The first step is to install the pipe rack with multiple rows of multi-layer steel pipes on the inside of the cleaning box on the left side of the cleaning pipe;

[0015] The second step is to connect the inlet of the water distributor to the outlet of the steam car with a high-temperature resistant hose equipped with a valve;

[0016] Step 3: Adjust the movable seat and insert the left end of the cleaning pipe into the corresponding oil pipe at the bottom layer;

[0017] Step 4: Open the valve;

[0018] Step 5: After the steel ball moves to the left end of the oil pipe, close the valve, rotate the rope shaft to move the steel ball to the inside of the water distributor, pull out the plug corresponding to the cleaned oil pipe, and insert it into the sealing hole on the corresponding cleaning pipe;

[0019] Step 6: Repeat steps 4 and 5, and the steel balls move in the bottom layer of the multi-row oil pipes in turn to complete the cleaning operation of the bottom layer of the multi-row oil pipes. After the cleaning is completed, close the valve;

[0020] Step 7. Adjust the movable seat so that the water distributor moves to the right, then upward, and finally to the left, and insert the cleaning pipe into the multiple rows of oil pipes on the upper layer;

[0021] Step 8: Repeat steps 4 to 7 to complete the cleaning operation inside the multi-layer and multi-row oil pipes.

[0022] The following is a further optimization and / or improvement of the second technical solution of the above invention:

[0023] In the fourth step above, after the valve is opened, the opening size of the valve is controlled by the rotation speed of the rope winding shaft.

[0024] The present invention has a reasonable and compact structure. By arranging the steel ball, it can play a role in clearing the oil pipe when cleaning the oil pipe. At the same time, when the steel ball moves in the oil pipe under the action of steam, the steam can quickly melt the wax on the inner wall of the oil pipe, thereby improving the cleaning efficiency. The plug plate not only facilitates the movement of the steel ball into the corresponding cleaning pipe, but also facilitates the flow of steam into the corresponding cleaning pipe. The arrangement of the rope reel and the wire rope facilitates the collection of the steel ball into the water distributor after the oil pipe is cleaned, thereby reducing the labor intensity of workers, controlling the pollution source generated by the ground cleaning oil pipe, and realizing that oil and water do not fall to the ground during the ground cleaning operation, thereby reducing the generation of oily sludge, and has the characteristics of safety, labor saving, simplicity and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attachment Figure 1 This is a schematic diagram of the main cross-sectional structure of Example 1.

[0026] Attachment Figure 2 It is a schematic diagram of a top-view cross-sectional structure of the first embodiment.

[0027] Attachment Figure 3 This is an enlarged structural diagram of point A in Example 1.

[0028] Attachment Figure 4 This is a schematic diagram of the main cross-sectional structure of Example 2.

[0029] Attachment Figure 5 This is a schematic diagram of the top cross-sectional structure of the second embodiment.

[0030] Attachment Figure 6 This is an enlarged structural diagram of point B in Example 2.

[0031] The codes in the accompanying drawings are: 1 for the cleaning box, 2 for the water distributor, 3 for the movable seat, 4 for the steel ball, 5 for the wire rope, 6 for the rope winding shaft, 7 for the cleaning pipe, 8 for the first rotating handwheel, 9 for the rope threading hole, 10 for the second rotating handwheel, 11 for the front sealing strip, 12 for the rear sealing strip, 13 for the left sealing strip, 14 for the right sealing strip, 15 for the sealing ring, 16 for the sewage box, 17 for the sewage valve, 18 for the plug plate, and 19 for the oil pipe. DETAILED DESCRIPTION

[0032] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0033] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 For example, the positional relationships of front, back, up, down, left, and right are determined according to the layout directions of the drawings in the specification.

[0034] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0035] Example 1: As shown in the attached Figure 1 、 2 As shown in Figure 3, the internal device of the local oil cleaning pipe includes a cleaning box 1, a water divider 2, a movable seat 3, a plug plate 18, a steel ball 4 and a wire rope 5. A water divider 2 is provided on the inner side of the right part of the cleaning box 1. A movable seat 3 for moving the water divider 2 leftward and rightward and up and down is installed on the upper side of the water divider 2. A rope reel 6 is installed in front of the water divider 2. Several cleaning pipes 7 are fixedly connected at intervals at the front and back of the left side of the water divider 2 corresponding to the rear position of the rope reel 6. A plug plate 18 is sealed and installed on the water divider 2 corresponding to the position of each cleaning pipe 7. Each plug plate 18 is inclined from left to right and from back to front. A sealing hole matching the plug plate 18 is provided on the right side of the cleaning pipe 7. A steel ball 4 is provided on the inner side of the right end of the cleaning pipe 7 located in the front. The steel ball 4 is connected to the first end of the wire rope 5. The second end of the wire rope 5 is fixedly connected to the rope reel 6 after being wound several times on the rope reel.

[0036] According to the requirements, the steel ball 4 is a hollow ball, the cross section of the water divider 2 can be rectangular, and the movable seat 3 is an existing well-known technology, such as the manual XYZ three-axis cross slide with the model number RY140, or the XYZ screw three-axis motion platform with the model number GF70-1204 / 1605 / 1610-200mm. The movable seat 3 is installed on the upper right side of the cleaning box 1. During use, by setting the steel ball 4, when cleaning the oil pipe 19, it can play a role in clearing the pipe, and the completely blocked dirt will be discharged from the oil pipe 19 under the action of steam or hot water. At the same time, when the steel ball 4 moves in the oil pipe 19 under the action of steam or hot water, the steam or hot water flows out from the gap between the steel ball 4 and the oil pipe 19, which can quickly melt the wax on the inner wall of the oil pipe 19 and improve the cleaning efficiency. The insert plates 18 are tilted from left to right and from back to front to facilitate the movement of the steel ball 4 from the water divider 2 to the corresponding cleaning pipe 7, and also facilitate the flow of steam or hot water into the corresponding cleaning pipe 7. The setting of the sealing hole, After the front oil pipe 19 is cleaned, the insert plate 18 is inserted into the corresponding sealing hole to seal the cleaning pipe 7, so that the steel ball 4 can be moved into the rear cleaning pipe 7 and the oil pipe 19 can be cleaned, reducing the disassembly and assembly of the insert plate 18. At the same time, it can also serve as an identification. The arrangement of the rope reel 6 and the wire rope 5 facilitates the retraction of the steel ball 4 into the water distributor 2 after the oil pipe 19 is cleaned, reducing the labor intensity of workers, reducing the probability of accidents and incidents, and improving the safety of well repair operations. The pollution source generated by the underground cleaning oil pipe 19 can be controlled, so that oil and water do not fall to the ground during the underground cleaning operation, reducing the generation of oily sludge. The present invention has a reasonable and compact structure, is easy to use, and has the characteristics of safety, labor saving, simplicity, and high efficiency.

[0037] The internal device of the above-mentioned oil cleaning pipe can be further optimized and / or improved according to actual needs:

[0038] As attached Figure 1 、 2 As shown in Figure 3, the left end of the rope winding shaft 6 is rotatably mounted on the inner side of the left part of the water divider 2, and the right end of the rope winding shaft 6 is sealed and passes through the right side of the water divider 2 and is located on the right side of the water divider 2. A first rotating handwheel 8 is fixedly mounted on the outer side of the right end of the rope winding shaft 6. According to needs, the first rotating handwheel 8 can also be an existing well-known rocker handle or a reduction motor, and the rope winding shaft 6 can also be rotatably mounted on the inner side of the front part of the water divider 2 in the forward and backward directions. The first rotating handwheel 8 is fixedly mounted with a drive shaft with the left end passing through the inner side of the water divider 2. The drive shaft and the rope winding shaft 6 are connected together through an existing well-known worm gear transmission. During use, through such a setting, the movement of the steel ball 4 in the pipeline can be controlled. When cleaning the oil pipe 19 on the ground, after the steel ball 4 is flushed out by steam or hot water in the oil pipe 19, it can be retrieved again and can be recycled. It also facilitates the cleaning operation of the inner wall of the oil pipe 19.

[0039] Example 2: As shown in the attached Figure 4 、 5As shown in Figures 6 and 7, the rope winding shaft 6 is rotatably mounted on the upper front side of the water divider 2. A rope threading hole 9 for threading the steel wire rope 5 is provided on the upper side of the water divider 2 corresponding to the middle position of the rope winding shaft 6. A second rotating handwheel 10 is fixedly mounted on the outer side of the right end of the rope winding shaft 6. The difference between this embodiment and the first embodiment lies only in the arrangement of the rope winding shaft 6. According to the needs, the left and right parts of the rope winding shaft 6 are rotatably mounted on the upper side of the water divider 2 through the existing well-known bearing seats. The second rotating handwheel 10 can also be an existing well-known rocker handle or a reduction motor. The rope winding shaft 6 can also be rotatably mounted on the upper front side of the water divider 2 in the forward and backward directions. During use, such an arrangement facilitates the maintenance of the steel wire rope 5 and the rope winding shaft 6.

[0040] As attached Figure 1 、 2 As shown in Figures 3, 4, 5, and 6, the upper side of the water divider 2 corresponding to each cleaning pipe 7 position is provided with a strip-shaped mounting hole that is connected inside and outside. The mounting holes are inclined from left to right and from back to front. At least one layer of sealing gasket is installed on the upper side of the water divider 2 corresponding to each mounting hole position from top to bottom. The sealing gasket includes a front sealing strip 11 that is fixedly installed at the front of the mounting hole and a rear sealing strip 12 that is fixedly installed at the rear of the mounting hole. The front side of the rear sealing strip 12 and the rear side of the front sealing strip 11 are in contact with each other. The lower end of the insert 18 passes through the sealing gasket and the mounting hole in sequence and is installed in the water divider 2. During use, through such an arrangement, each time a steel pipe is cleaned, the steel ball 4 can enter the corresponding cleaning pipe 7 and oil pipe 19 under the guidance of the insert 18, which makes cleaning convenient. At the same time, such an arrangement can also reduce the production cost and maintenance cost of the present invention. It can solve the problems of high labor intensity, low degree of mechanization, large labor volume, and low work efficiency of well repair workers.

[0041] As attached Figure 1 、 2 As shown in Figures 3, 4, 5, and 6, a sealing hole corresponding to the mounting hole is provided on the upper right side of the cleaning pipe 7, and at least one layer of sealing blocks is installed on the sealing hole from top to bottom. The sealing blocks include a left sealing strip 13 that is fixedly mounted on the left side of the sealing hole and a right sealing strip 14 that is fixedly mounted on the right side of the sealing hole. The right side of the left sealing strip 13 and the left side of the right sealing strip 14 are in contact with each other. According to needs, a ring platform is fixed on the outer side of the right side of the cleaning pipe 7, and a sealing hole is provided on the upper side of the ring platform. During use, after cleaning, the plug-in plate 18 in the mounting hole can be inserted into the corresponding sealing hole, which can quickly and conveniently seal the cleaning pipe 7 corresponding to the cleaned oil pipe 19, reduce the number of valves or gates installed, and serve as an identification, thereby improving work efficiency.

[0042] As attached Figure 1 、 3As shown in Figures 4 and 6, a plurality of sealing ring grooves are provided on the left side of the outer side of the left end of the cleaning tube 7 corresponding to the left side of the sealing hole, and a sealing ring 15 is provided in each sealing ring groove. During use, with this arrangement, the cleaning tube 7 can be inserted into the oil pipe 19 to complete the sealed connection, which is convenient for assembly and disassembly. It can allow steam or hot water to flow into the oil pipe 19, which has a better cleaning effect on the inner wall of the oil pipe 19, and can also increase the thrust of the steel ball 4 in the oil pipe 19, thereby improving the cleaning rate.

[0043] As attached Figure 1 、 3 As shown in Figures 4, 6, and 7, a gap is provided between the outer side of steel ball 4 and the inner side of cleaning tube 7. Depending on the requirements, the outer diameter of steel ball 4 is 2 mm smaller than the inner diameter of oil pipe 19. During use, the steam or hot water within water distributor 2 propels steel ball 4 forward. Most of the heat energy from the steam or hot water flows through the gap between oil pipe 19 and steel ball 4, quickly melting the wax on the inner wall of oil pipe 19 for a more thorough cleaning.

[0044] As attached Figure 1 、 2 As shown in Figures 4 and 5, the inner wall of the lower side of the cleaning box 1 is recessed downward to form a sewage box 16. A sewage hole communicating with the inside and outside is provided in the center of the sewage box 16. A sewage valve 17 is installed on the outside of the cleaning box 1 at the position of the sewage hole. As required, a skid is fixedly installed on the lower side of the cleaning box 1. During use, this arrangement facilitates the sedimentation of cleaned dirt into the sewage box 16, facilitating subsequent centralized collection or discharge. This effectively solves the long-standing problems of severe environmental pollution and poor working environment in oilfield well repair operations, and plays an important role in environmental protection of underground operations.

[0045] Example 3: As shown in the attached Figure 1 、 2 As shown in Figures 3, 4, 5, and 6, a method for cleaning the inside of an oil pipe is performed in the following steps:

[0046] The first step is to install a pipe rack with multiple rows of multi-layer steel pipes fixedly installed on the inside of the cleaning box 1 on the left side of the cleaning pipe 7;

[0047] The second step is to connect the inlet of the water distributor 2 with the outlet of the steam car using a high-temperature resistant hose with a valve;

[0048] The third step is to adjust the movable seat 3 and insert the left end of the cleaning pipe 7 into the corresponding oil pipe 19 at the bottom layer;

[0049] Step 4: Open the valve;

[0050] Step 5: After the steel ball 4 moves to the left end of the oil pipe 19, close the valve, rotate the rope reel 6 to move the steel ball 4 to the inside of the water distributor 2, pull out the plug 18 corresponding to the cleaned oil pipe 19, and insert it into the corresponding sealing hole on the cleaning pipe 7;

[0051] Step 6: Repeat steps 4 and 5, and the steel ball 4 moves in the bottom layer of the multiple rows of oil pipes 19 in turn to complete the cleaning operation of the bottom layer of the multiple rows of oil pipes 19. After the cleaning is completed, close the valve;

[0052] Step 7: Adjust the movable seat 3 so that the water distributor 2 moves to the right, then moves upward, and finally moves to the left, and insert the cleaning pipe 7 into the multiple rows of oil pipes 19 on the upper layer;

[0053] In the eighth step, steps 4 to 7 are repeated to complete the cleaning operation inside the multi-layer and multi-row oil pipes 19 .

[0054] During the implementation of this method, the labor intensity of workers can be reduced, the probability of accidents and incidents can be lowered, and the safety of well repair operations can be improved; the pollution source generated by the underground oil cleaning pipe 19 can be controlled, so that oil and water do not fall to the ground during the underground cleaning operation, and the generation of oily sludge can be reduced; and the operation capacity and efficiency of a single team can also be improved.

[0055] The above method for cleaning the inside of the oil pipe can be further optimized and / or improved according to actual needs:

[0056] As attached Figure 1 、 2 As shown in Figures 3, 4, 5, and 6, in the fourth step, after the valve is opened, the valve opening is controlled by the rotational speed of the rope winding shaft 6. After the valve is opened, the first and second rotating handwheels 10 are no longer manually operated, and the steel ball 4 can move within the oil pipe 19 driven by steam or hot water. By controlling the valve opening by the rotational speed of the rope winding shaft 6, if the rope winding shaft 6 stops rotating for an extended period, mechanical deformation within the oil pipe 19 may occur, making it difficult to clean and requiring repair. In this case, the valve must be closed promptly to avoid wasted cleaning time.

[0057] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. An internal device for cleaning oil pipes, characterized in that The cleaning pipe is provided with a sealing hole matching the plug plate, which is convenient for inserting the plug plate into the corresponding cleaning pipe after cleaning the front oil pipe.

2. The internal device of the underground oil cleaning pipe according to claim 1, characterized in that The left end of the rope winding shaft is rotatably installed on the inner side of the left part of the water divider, and the right end of the rope winding shaft is sealed and located on the right side of the water divider. A first rotating handwheel is fixedly installed on the outer side of the right end of the rope winding shaft.

3. The internal device of the underground oil cleaning pipe according to claim 1, characterized in that The rope winding shaft is rotatably installed on the upper side of the front of the water divider. A rope threading hole for threading a wire rope is provided on the upper side of the water divider corresponding to the middle position of the rope winding shaft. A second rotating handwheel is fixedly installed on the outer side of the right end of the rope winding shaft.

4. The internal device of the underground oil cleaning pipe according to claim 1, 2 or 3, characterized in that A strip-shaped mounting hole communicating inside and outside is provided on the upper side of the water divider corresponding to each cleaning pipe position. The mounting holes are inclined from left to right and from back to front. At least one layer of sealing gasket is installed on the upper side of the water divider corresponding to each mounting hole position from top to bottom. The sealing gasket includes a front sealing strip that is sealingly fixedly installed at the front of the mounting hole and a rear sealing strip that is sealingly fixedly installed at the rear of the mounting hole. The front side of the rear sealing strip and the rear side of the front sealing strip are in contact with each other. The lower end of the plug-in plate passes through the sealing gasket and the mounting hole in turn and is installed in the water divider.

5. The internal device of the underground oil cleaning pipe according to claim 4, characterized in that A sealing hole corresponding to the mounting hole is provided on the upper right side of the cleaning pipe. At least one layer of sealing blocks is installed on the sealing hole from top to bottom. The sealing block includes a left sealing strip that is sealingly fixedly installed on the left part of the sealing hole and a right sealing strip that is sealingly fixedly installed on the right part of the sealing hole. The right side of the left sealing strip and the left side of the right sealing strip are in contact with each other.

6. The internal device of the underground oil cleaning pipe according to claim 5, characterized in that A plurality of sealing ring grooves are arranged at intervals on the left and right sides of the outer side of the left end of the cleaning pipe corresponding to the left position of the sealing hole, and a sealing ring is arranged in each sealing ring groove.

7. The internal device of the underground oil cleaning pipe according to claim 1, 2, 3, 5 or 6, characterized in that There is a gap between the outer side of the steel ball and the inner side of the cleaning pipe; or / and, the inner wall of the lower side of the cleaning box is recessed downward to form a sewage box, and a sewage hole communicating with the inside and outside is provided in the center of the sewage box, and a sewage valve is installed on the outside of the cleaning box corresponding to the position of the sewage hole.

8. The internal device of the underground oil cleaning pipe according to claim 4, characterized in that There is a gap between the outer side of the steel ball and the inner side of the cleaning pipe; or / and, the inner wall of the lower side of the cleaning box is recessed downward to form a sewage box, and a sewage hole communicating with the inside and outside is provided in the center of the sewage box, and a sewage valve is installed on the outside of the cleaning box corresponding to the position of the sewage hole.

9. A method for cleaning the interior of an underground oil pipe according to any one of claims 1 to 8, characterized in that: Follow these steps: The first step is to install the pipe rack with multiple rows of multi-layer steel pipes on the inside of the cleaning box on the left side of the cleaning pipe; The second step is to connect the inlet of the water distributor to the outlet of the steam car with a high-temperature resistant hose equipped with a valve; Step 3: Adjust the movable seat and insert the left end of the cleaning pipe into the corresponding oil pipe at the bottom layer; Step 4: Open the valve; Step 5: After the steel ball moves to the left end of the oil pipe, close the valve, rotate the rope shaft to move the steel ball to the inside of the water distributor, pull out the plug corresponding to the cleaned oil pipe, and insert it into the sealing hole on the corresponding cleaning pipe; Step 6: Repeat steps 4 and 5, and the steel balls move in the bottom layer of the multi-row oil pipes in turn to complete the cleaning operation of the bottom layer of the multi-row oil pipes. After the cleaning is completed, close the valve; Step 7. Adjust the movable seat so that the water distributor moves to the right, then upward, and finally to the left, and insert the cleaning pipe into the multiple rows of oil pipes on the upper layer; Step 8: Repeat steps 4 to 7 to complete the cleaning operation inside the multi-layer and multi-row oil pipes.

10. The method for cleaning the interior of an oil pipe according to claim 9, characterized in that In the fourth step, after the valve is opened, the opening size of the valve is controlled by the rotation speed of the rope winding shaft.

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