Integrated well washing pry equipment and oil well hot washing method thereof

Abstract

The invention discloses integrated well washing pry equipment and an oil well hot washing method thereof.The integrated well washing pry equipment comprises a heating ring which is arranged in an annular space between an oil pipe and a sleeve in a sliding mode and vertically ascends and descends through a lifting mechanism; the hot water device is used for heating to form hot water and conveying the hot water into the heating ring; wherein a plurality of drainage channels used for guiding hot water to flow spirally are formed in the heating ring, a groove is formed in the inner side face of the heating ring, so that a liquid storage cavity is formed between the heating ring and the oil pipe, and the upper portion and the lower portion of the liquid storage cavity communicate with the drainage channels through a plurality of connecting channels; the number of the connecting channels located on the upper portion of the liquid storage cavity is larger than that of the connecting channels located on the lower portion of the liquid storage cavity. By means of the device, the utilization rate of hot water heat can be increased, the difficulty of follow-up hot washing paraffin removal on the oil pipe can be lowered, and therefore the efficiency and effect of hot washing paraffin removal are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of well washing, and in particular to an integrated well washing skid device and an oil well hot washing method thereof. Background Art

[0002] When the oil well is working normally, the crude oil produced by the oil well contains wax. During the production process, when the composition, temperature and pressure of the crude oil change and its ability to dissolve wax decreases, the wax will precipitate from the crude oil and gather and adhere to the pipe wall. Wax deposition on the pipe wall will cause the cross-section of the oil flow channel to decrease, the load of the oil well to increase, and the back pressure at the wellhead to increase. In severe cases, it may even cause problems such as wax sticking and the breakage of the pull rod, affecting the production of the oil well.

[0003] At present, most oil wells use hot washing to dewax the oil pipes, that is, the fluid (such as water) heated on the ground is injected into the annular space of the oil casing, so that a short-term high-temperature environment is formed in the wellbore to melt the wax on the oil pipe. Since this method directly injects the hot fluid into the annular space of the oil casing, it cannot ensure that the hot fluid flows completely downward along the wall of the oil pipe. The utilization rate of the heat of the hot fluid in heating the oil pipe is low, thereby increasing the demand for hot fluid in hot washing. At the same time, the hot fluid flows downward along the wall of the oil pipe in the wellbore, so that the hot fluid will exchange heat with the oil pipe, thereby reducing the heat, so that the length of the oil pipe heated by the hot fluid is limited, affecting the effect of hot washing to dewax. Summary of the invention

[0004] The object of the present invention is to provide an integrated well washing skid device and an oil well hot washing method thereof, which can improve the utilization rate of hot water heat and reduce the difficulty of subsequent hot washing and dewaxing of the oil pipe, thereby ensuring the efficiency and effect of hot washing and dewaxing.

[0005] The technical solution adopted by the present invention to solve the above problems is:

[0006] Integrated well washing skid equipment, including:

[0007] A heating ring is slidably disposed in the annular space between the oil pipe and the casing, and is vertically lifted and lowered by a lifting mechanism;

[0008] A hot water device, which is used to heat hot water and transport it to the heating ring;

[0009] Among them, the heating ring is provided with a plurality of drainage channels for guiding hot water to flow in a spiral shape, the inlet and outlet of the drainage channel are respectively located on the top surface and the bottom surface of the heating ring, and a groove is opened on the inner side surface of the heating ring to form a liquid storage cavity between the heating ring and the oil pipe, and the upper and lower parts of the liquid storage cavity are connected with the drainage channel through a plurality of connecting channels, and the number of connecting channels located in the upper part of the liquid storage cavity is greater than the number of connecting channels located in the lower part of the liquid storage cavity.

[0010] As a further improvement of the above technical solution, an annular column-shaped extension portion is provided on the top surface of the heating ring, and a plurality of annular grooves arranged at equal angles along the axial direction of the oil pipe are provided on the outer surface of the oil pipe. The annular grooves are located on the moving trajectory of the heating ring so that the liquid storage chamber can be connected with the annular space through the annular grooves. When the bottom surface of the groove and the bottom surface of the annular groove are on the same horizontal plane, the extension portion covers the annular groove corresponding thereto.

[0011] As a further improvement of the above technical solution, the lifting mechanism includes a machine body, two traction rollers and a pushing seat. The traction roller is rotatably arranged on the machine body and the two traction rollers are synchronously rotated by a first motor. A traction rope is wound around the traction roller along its axial direction in circles. The two ends of the traction rope are respectively fixed to the traction roller and the heating ring. The connection between the two traction ropes on the heating ring is symmetrically arranged relative to the heating ring. The traction roller is slidably arranged on the output shaft of the first motor and cannot rotate. The pushing seat is slidably arranged on the machine body. A threaded shaft is rotatably arranged on the machine body. The threaded shaft is arranged parallel to the output shaft of the first motor and a transmission connection is realized between the two by a gear transmission mechanism. The pushing seat is sleeved on the threaded shaft in a threaded matching manner. Two limit plates are provided on the pushing seat at a position opposite to the traction roller. The traction roller is located between the two limit plates and its two ends are respectively rotatably connected to the two limit plates.

[0012] As a further improvement of the above technical solution, there are two drainage channels, the two drainage channels are staggered and arranged, and the central axes of the two are on the same straight line.

[0013] As a further improvement of the above technical solution, a plurality of roller units are provided on the outer side surface of the heating ring, and the roller units are arranged on the heating ring at equal intervals along the axial direction of the heating ring. The roller unit includes a plurality of rollers, and the rollers are arranged on the heating ring at equal angles around the central axis of the heating ring. The rollers are arranged on the heating ring for radial sliding along the heating ring, and a spring for applying an outward movement force to the rollers is provided between the two, and the two ends of the spring respectively press against the rollers and the heating ring.

[0014] As a further improvement of the above technical solution, the hot water device includes a vehicle body, on which is provided a water tank for storing clean water, an electric boiler for heating the clean water to form hot water, and a number of reels corresponding to the drainage channels one by one. The water tank and the electric boiler are connected via a liquid adding pipe, the electric boiler is provided with a liquid outlet pipe, and water pumps are installed on the liquid adding pipe and the liquid outlet pipe. The reel is rotatably arranged on the vehicle body, and a second motor for driving each reel to rotate synchronously is installed on the vehicle body. A water pipe is wound around the reel, and the liquid inlet end of the water pipe is fixed on the reel and the opening direction of the liquid inlet end is in the same straight line as the central axis of the reel. The liquid inlet end of the water pipe is connected to the outlet of the liquid outlet pipe through a rotating joint, and the liquid outlet end of the water pipe can be connected to the inlet of the drainage channel.

[0015] As a further improvement of the above technical solution, the connection points of the two traction ropes on the heating ring and the inlets of the two drainage channels are alternately arranged at equal angles on the top surface of the heating ring around the central axis of the heating ring, the outlet and inlet of the drainage channel are on the same vertical line and the outlet of the drainage channel faces the oil pipe.

[0016] The present invention also provides an oil well hot washing method based on the integrated well washing skid device described in any one of the above technical solutions, comprising the following steps:

[0017] Step 1: Heat water into hot water through a hot water device, and then transport the hot water into the drainage channel on the heating ring. While the hot water flows spirally from top to bottom along the drainage channel, it also enters the liquid storage chamber through the connecting channel at the upper part of the liquid storage chamber;

[0018] Step 2: continuously supply hot water to the heating ring so that the hot water can gradually fill the liquid storage cavity and perform heat exchange with the wall of the oil pipe, thereby increasing the temperature of the wall of the oil pipe and causing the wax on the inner wall to melt;

[0019] Step three, lower the heating ring intermittently through the lifting mechanism, so that the heating ring can clean the wax from the oil pipe section by section from top to bottom.

[0020] As a further improvement of the above technical solution, in the step 2, during the process of dewaxing the oil pipe with the hot water in the liquid storage chamber, the hot water in the liquid storage chamber that exchanges heat with the oil pipe can be discharged from the liquid storage chamber through the connecting channel at the lower part of the liquid storage chamber and flushed on the oil pipe below the heating ring, and the hot water in the upper part of the drainage channel can enter the liquid storage chamber through the connecting channel at the upper part of the liquid storage chamber.

[0021] As a further improvement of the above technical solution, in step three, during the lifting and lowering of the heating ring, all the hot water in the liquid storage chamber is discharged outward, so that the hot water in the heating ring flushes the oil pipe located in the moving direction of the heating ring.

[0022] Compared with the prior art, the present invention has the following advantages and effects:

[0023] (1) The present invention realizes that the hot water in the liquid storage chamber performs heat exchange on the oil pipe and the hot water output through the drainage channel can flush and heat the oil pipe located below the heating ring through the flow of hot water on the heating ring and between the heating ring and the oil pipe, combined with the hot water device's conveying effect on the hot water and the lifting mechanism's driving effect on the vertical lifting of the heating ring. This improves the utilization rate of the hot water heat and reduces the difficulty of the subsequent heating ring to perform hot washing and dewaxing on the oil pipe, thereby ensuring the efficiency and effect of hot washing and dewaxing.

[0024] (2) In the present invention, hot water is directly transported into the heating ring to heat the oil pipe, thereby reducing heat loss caused by heat exchange during hot water transportation, ensuring the hot water in the liquid storage chamber has a hot washing and wax removal effect on the oil pipe. Combined with the vertical lifting effect of the heating ring, the depth of the wellbore for hot washing and wax removal treatment is expanded on the basis of ensuring the hot washing and wax removal effect, thereby improving the hot washing and wax removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an integrated well washing skid device according to an embodiment of the present invention.

[0026] Figure 2 yes Figure 1 A schematic cross-sectional view of the structure of the heating ring shown in FIG.

[0027] Figure 3 yes Figure 2 A schematic cross-sectional view of the structure between the roller and the heating ring is shown in FIG.

[0028] Figure 4 yes Figure 1 A structural schematic diagram of a partial lifting mechanism is shown in FIG.

[0029] Figure 5 yes Figure 1 The structural schematic diagram of the second part of the lifting mechanism is shown in FIG.

[0030] Figure 6 yes Figure 1 The structural schematic top view of the hot water device shown in FIG.

[0031] Figure 7 It is a schematic diagram of the flow structure of the oil well hot washing method of embodiment 2.

[0032] Among them, the heating ring 1, the drainage channel 11, the groove 12, the liquid storage chamber 13, the connecting channel 14, the hot water device 2, the car body 21, the water tank 22, the electric boiler 23, the reel 24, the liquid adding pipeline 251, the liquid outlet pipeline 252, the water pump 26, the second motor 27, the water pipe 28, the belt transmission mechanism 29, the lifting mechanism 3, the body 31, the traction roller 32, the pushing seat 33, the first motor 34, the traction rope 35, the threaded shaft 36, the gear transmission mechanism 37, the limit plate 38, the closing plate 4, the extension part 51, the annular groove 52, the roller unit 6, the roller 61, the spring 62, the guide wheel 71, the limit wheel group 72, the limit wheel 73, the guide wheel group 8, the guide wheel 81, the oil pipe 91, the casing 92, the annular space 93, the pumping unit 94, the oil tree 95, and the soil layer 96. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0034] Embodiment 1.

[0035] See also Figure 1-Figure 6 The integrated well washing skid equipment of this embodiment includes a heating ring 1 and a hot water device 2 for heating hot water and conveying it to the heating ring 1. The heating ring 1 is slidably arranged in the annular space between the oil pipe and the casing and cannot rotate, and is vertically lifted and lowered by a lifting mechanism 3. A plurality of drainage channels 11 for guiding the hot water to flow in a spiral shape are arranged in the heating ring 1. The inlet and outlet of the drainage channel 11 are respectively located on the top surface and the bottom surface of the heating ring 1. A groove 12 is provided on the inner side surface of the heating ring 1 so that a liquid storage chamber 13 is formed between the heating ring 1 and the oil pipe. The upper and lower parts of the liquid storage chamber 13 are connected to the drainage channel 11 through a plurality of connecting channels 14. The number of connecting channels 14 located at the upper part of the liquid storage chamber 13 is greater than the number of connecting channels 14 located at the lower part of the liquid storage chamber 13.

[0036] When hot washing the oil well, the hot water heated in the hot water device 2 is transported into the drainage channel 11 on the heating ring 1, so that the hot water flows along the drainage channel 11 and also enters through the connecting channel 14 located at the upper part of the heating ring 1 and gradually fills the liquid storage chamber 13, so that the hot water in the liquid storage chamber 13 can increase the temperature of the wall of the oil pipe, so that the wax on the inner wall of the oil pipe is melted by the heat, thereby achieving the effect of wax removal. In this process, the hot water in the liquid storage chamber 13 that exchanges heat with the oil pipe can be discharged from the liquid storage chamber 13 through the connecting channel 14 on the upper part of the heating ring 1, so that the hot water in the upper part of the drainage channel 11 can enter the liquid storage chamber 13 again through the connecting channel 14 located at the upper part of the heating ring 1, thereby ensuring the temperature of the hot water in the liquid storage chamber 13 and thus ensuring the wax removal effect.

[0037] After a certain length of oil pipe is subjected to the hot washing and wax removal treatment for a specific time, the heating ring 1 is driven to move vertically by the lifting mechanism 3 to adjust the hot washing and wax removal position of the heating ring 1 on the oil pipe.

[0038] In order to ensure the filling of hot water in the liquid storage chamber 13, the heating ring 1 may be provided with a closing plate 4 for closing the outlet of the drainage channel 11. The closing plate 4 is hinged on the heating ring 1 and a torsion spring is provided between the two for driving the closing plate 4 to cover the outlet of the drainage channel 11, so that the closing plate 4 can be opened only after a certain amount of hot water in the heating ring 1 reaches a certain amount, thereby ensuring the amount of hot water entering the liquid storage chamber 13. At the same time, when the closing plate 4 is opened, it can also play a certain guiding role for the hot water, so that the hot water flowing out of the drainage channel 11 can be directly flushed on the outer wall of the oil pipe located below the heating ring 1, achieving a certain effect of hot washing and wax removal, thereby reducing the difficulty of subsequent wax removal by the heating ring 1.

[0039] See also Figure 1 , Figure 2 The top surface of the heating ring 1 is provided with an annular columnar extension portion 51, and the outer surface of the oil pipe is provided with a plurality of annular grooves 52 arranged at equal angles along the axial direction of the oil pipe. The annular grooves 52 are located on the moving trajectory of the heating ring 1, so that the liquid storage chamber 13 can be connected with the annular space through the annular grooves 52. When the bottom surface of the groove 12 and the bottom surface of the annular groove 52 are on the same horizontal plane, the extension portion 51 covers the annular groove 52 corresponding thereto.

[0040] During the hot washing process, the heating ring 1 is driven by the lifting mechanism 3 to move intermittently vertically, so that the bottom of the liquid storage chamber 13 can be connected with the external space via the annular groove 52, so that the hot water in the liquid storage chamber 13 after heat exchange with the previous section of the oil pipe can be quickly discharged, while ensuring the effect of heat exchange between the heating ring 1 and the next section of the oil pipe, the hot water in the heating ring 1 can flush the oil pipe located in the moving direction during the movement, thereby reducing the difficulty of the subsequent hot washing and wax removal by the heating ring 1.

[0041] See also Figure 2 There are two drainage channels 11, which are staggered and have their central axes on the same straight line. While ensuring that hot water flows in a spiral from top to bottom along the drainage channel 11, it can also accelerate the flow of hot water into the liquid storage chamber 13 for filling, thereby ensuring the heat exchange effect between the heating ring 1 and the oil pipe, thereby ensuring the wax removal effect on the inner wall of the oil pipe.

[0042] See also Figure 2 , Figure 3, a plurality of roller units 6 are arranged on the outer side of the heating ring 1 at equal intervals along the axial direction of the heating ring 1. The roller units 6 include a plurality of rollers 61, and the rollers 61 are arranged on the heating ring 1 at equal angles around the central axis of the heating ring 1. The rollers 61 are arranged on the heating ring 1 along the radial direction of the heating ring 1 and a spring 62 is arranged between the rollers 61 to apply an outward force to the rollers 61. The two ends of the spring 62 are respectively pressed against the rollers 61 and the heating ring 1. Through the arrangement of the roller units 6, the stability of the vertical lifting state of the heating ring 1 in the annular space is ensured, and the contact area between the heating ring 1 and the casing is reduced, thereby reducing the friction damage to the casing caused by the vertical lifting of the heating ring 1.

[0043] See also Figure 4 , Figure 5 The lifting mechanism 3 includes a body 31, two traction rollers 32 and a pushing seat 33. The traction roller 32 is rotatably arranged on the body 31 and the two traction rollers 32 are synchronously rotated by a first motor 34. A traction rope 35 is wound around the traction roller 32 along its axial direction in circles. The two ends of the traction rope 35 are respectively fixed to the traction roller 32 and the heating ring 1. The connection between the two traction ropes 35 on the heating ring 1 is symmetrically arranged with respect to the heating ring 1. The traction roller 32 is slidably arranged on the output shaft of the first motor 34 and cannot rotate. The pushing seat 33 is slidably arranged on the body 31. A threaded shaft 36 is rotatably arranged on the body 31. The threaded shaft 36 is arranged parallel to the output shaft of the first motor 34 and a transmission connection is realized between the two through a gear transmission mechanism 37. The pushing seat 33 is sleeved on the threaded shaft 36 in a threaded matching manner. Two limit plates 38 are arranged on the pushing seat 33 at a position opposite to the traction roller 32. The traction roller 32 is located between the two limit plates 38 and its two ends are rotatably connected to the two limit plates 38 respectively.

[0044] When the heating ring 1 is raised or lowered to adjust its position, the first motor 34 drives the two traction rollers 32 so that the two traction rollers 32 rotate synchronously to release or retract the traction rope 35, thereby realizing the raising and lowering of the heating ring 1. In this process, the gear transmission mechanism 37 transmits the transmission effect between the threaded shaft 36 and the output shaft of the first motor 34 so that the threaded shaft 36 rotates to drive the push seat 33 to move horizontally and linearly, thereby ensuring that the traction rope 35 is released or retracted circle by circle on the traction roller 32, thereby ensuring the stability of the vertical raising and lowering of the heating ring 1.

[0045] In order to ensure that the traction rope 35 can vertically enter the annular space, a guide wheel 71 for changing the direction of the traction rope 35 for vertical transportation and a limiting wheel group 72 for guiding the vertical transportation of the traction rope 35 can be installed on the body 31. The limiting wheel group 72 includes two limiting wheels 73. There is a gap between the two limiting wheels 73 for the traction rope 35 to pass through. The entrance of the gap is located on the guide wheel 71 in the direction of vertical transportation of the traction rope 35. When the traction rope 35 is located between the two limiting wheels 73, the two limiting wheels 73 are against the two sides of the traction rope 35.

[0046] See also Figure 6 The hot water device 2 includes a body 21, on which is provided a water tank 22 for storing clean water, an electric boiler 23 for heating clean water to form hot water, and a plurality of reels 24 corresponding to the drainage channel 11. The water tank 22 and the electric boiler 23 are connected via a liquid adding pipe 251, on which is provided a liquid outlet pipe 252, on which are installed a water pump 26, and the reels 24 are rotatably arranged on the body 21, on which is installed a second motor 27 for driving the reels 24 to rotate synchronously, and on which is wound a water pipe 28, a liquid inlet end of the water pipe 28 is fixed on the reel 24 and an opening of the liquid inlet end is in the same straight line as the central axis of the reel 24, the liquid inlet end of the water pipe 28 is connected to the outlet of the liquid outlet pipe 252 via a rotary joint, and the liquid outlet end of the water pipe 28 can be connected to the inlet of the drainage channel 11.

[0047] When in use, the water in the water tank 22 is transported into the electric boiler 23 through the water pump 26 on the liquid adding pipe 251, and heated into hot water by the electric boiler 23, and then the hot water is transported into the drainage channel 11 through the water pipe 28 by the water pump 26 on the liquid outlet pipe 252. When the heating ring 1 is vertically lifted and lowered under the drive of the lifting mechanism 3, the second motor 27 drives the reel 24, so that the reel 24 releases or retracts the water pipe 28, which ensures the stable delivery of hot water on the heating ring 1 and reduces the influence of the water pipe 28 in the annular space on the vertical lifting of the heating ring 1.

[0048] In this embodiment, the second motor 27 and one of the reels 24 are connected to each other through a belt transmission mechanism 29, and the reels 24 are connected to each other through a gear transmission mechanism.

[0049] In order to improve the convenience of operation, a thermometer and a flow meter can be installed on the liquid outlet pipe 252, so that the operator can grasp the temperature and amount of the delivered hot water, thereby ensuring the effect of hot washing and wax removal of the device.

[0050] In order to ensure the smoothness of the water pipe 28 entering the annular space, a guide wheel group 8 for guiding the transportation of the water pipe 28 can be installed on the body 31. The guide wheel group 8 includes two guide wheels 81. There is a gap between the two guide wheels 81 for the water pipe 28 to pass through. When the water pipe 28 is located between the two guide wheels 81, the two guide wheels 81 are against the two sides of the water pipe 28. At the same time, a driving motor for driving any one of the two guide wheels 81 to rotate can be installed on the body 31, thereby ensuring the stable transportation of the water pipe 28.

[0051] In this embodiment, the connection points of the two traction ropes 35 on the heating ring 1 and the inlets of the two drainage channels 11 are alternately arranged at equal angles on the top surface of the heating ring 1 around the central axis of the heating ring 1, while ensuring the stability of the vertical lifting of the heating ring 1 driven by the lifting mechanism 3, it also reduces the risk of entanglement between the traction rope 35 and the water pipe 28 during the vertical lifting of the heating ring 1, thereby ensuring the normal use of the heating ring 1. The outlet and inlet of the drainage channel 11 are on the same vertical line and the outlet of the drainage channel 11 faces the oil pipe, so that the hot water flowing out of the drainage channel 11 can continue to pour on the outer wall of the oil pipe and flow downward along it, thereby increasing the temperature of the oil pipe to melt the wax on the inner wall of the oil pipe, while achieving a certain wax cleaning effect, it also improves the efficiency of subsequent wax cleaning by the heating ring 1.

[0052] Embodiment 2.

[0053] See also Figure 7 This embodiment provides an oil well hot washing method based on the integrated well washing skid device described in the first embodiment, comprising the following steps:

[0054] Step 1: The water is heated into hot water by the hot water device 2, and then the hot water is transported into the drainage channel 11 on the heating ring 1. While the hot water flows spirally from top to bottom along the drainage channel 11, it also enters the liquid storage chamber 13 through the connecting channel 14 at the upper part of the liquid storage chamber 13;

[0055] Step 2: hot water is continuously supplied to the heating ring 1, so that the hot water can gradually fill the liquid storage cavity 13 and perform heat exchange with the wall of the oil pipe, thereby increasing the temperature of the wall of the oil pipe and causing the wax on the inner wall to melt;

[0056] Step three, the heating ring 1 is intermittently lowered by the lifting mechanism 3, so that the heating ring 1 can clean the wax from the oil pipe section by section from top to bottom.

[0057] In the present embodiment, in the step 2, during the process of dewaxing the oil pipe with the hot water in the liquid storage chamber 13, the hot water in the liquid storage chamber 13 that performs heat exchange with the oil pipe can be discharged from the liquid storage chamber 13 through the connecting channel 14 at the bottom of the liquid storage chamber 13 and flushed on the oil pipe below the heating ring 1, and the hot water in the upper part of the drainage channel 11 can enter the liquid storage chamber 13 through the connecting channel 14 at the top of the liquid storage chamber 13, thereby ensuring the temperature of the hot water in the liquid storage chamber 13, thereby ensuring the hot washing and dewaxing effect of the device.

[0058] In the present embodiment, in step three, during the raising and lowering of the heating ring 1, all the hot water in the liquid storage chamber 13 is discharged outward, so that the hot water in the heating ring 1 flushes the oil pipe in its moving direction, thereby reducing the difficulty of the subsequent heating ring 1 to perform hot washing and dewaxing on the oil pipe.

[0059] The above contents described in this specification are merely examples of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, as long as they do not deviate from the contents of the present specification or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. Integrated well washing skid equipment, characterized in that: include: A heating ring is slidably disposed in the annular space between the oil pipe and the casing, and is vertically lifted and lowered by a lifting mechanism; A hot water device, which is used to heat hot water and transport it to the heating ring; Among them, the heating ring is provided with a plurality of drainage channels for guiding hot water to flow in a spiral shape, the inlet and outlet of the drainage channel are respectively located on the top surface and the bottom surface of the heating ring, and a groove is opened on the inner side surface of the heating ring to form a liquid storage cavity between the heating ring and the oil pipe, and the upper and lower parts of the liquid storage cavity are connected with the drainage channel through a plurality of connecting channels, and the number of connecting channels located in the upper part of the liquid storage cavity is greater than the number of connecting channels located in the lower part of the liquid storage cavity.

2. The integrated well washing skid equipment according to claim 1 is characterized in that: An annular column-shaped extension portion is provided on the top surface of the heating ring, and a plurality of annular grooves arranged at equal angles along the axial direction of the oil pipe are provided on the outer surface of the oil pipe. The annular grooves are located on the moving trajectory of the heating ring so that the liquid storage chamber can be connected with the annular space through the annular grooves. When the bottom surface of the groove and the bottom surface of the annular groove are on the same horizontal plane, the extension portion covers the annular groove corresponding thereto.

3. The integrated well washing skid equipment according to claim 1 is characterized in that: The lifting mechanism includes a machine body, two traction rollers and a pushing seat. The traction roller is rotatably arranged on the machine body and the two traction rollers are synchronously rotated by a first motor. A traction rope is wound around the traction roller along its axial direction in circles. The two ends of the traction rope are respectively fixed to the traction roller and the heating ring. The connection parts of the two traction ropes on the heating ring are symmetrically arranged relative to the heating ring. The traction roller is slidably arranged on the output shaft of the first motor and cannot rotate. The pushing seat is slidably arranged on the machine body. A threaded shaft is rotatably arranged on the machine body. The threaded shaft is arranged parallel to the output shaft of the first motor and a transmission connection is realized between the two by a gear transmission mechanism. The pushing seat is sleeved on the threaded shaft in a threaded matching manner. Two limit plates are arranged on the pushing seat at a position opposite to the traction roller. The traction roller is located between the two limit plates and its two ends are respectively rotatably connected to the two limit plates.

4. The integrated well-washing skid equipment according to claim 1 is characterized in that: There are two drainage channels, which are staggered and arranged with their central axes on the same straight line.

5. The integrated well-washing skid equipment according to claim 1 is characterized in that: A plurality of roller units are arranged on the outer side surface of the heating ring, and the roller units are arranged on the heating ring at equal intervals along the axial direction of the heating ring. The roller unit includes a plurality of rollers, and the rollers are arranged on the heating ring at equal angles around the central axis of the heating ring. The rollers are arranged on the heating ring for radial sliding along the heating ring, and a spring for applying an outward movement force to the rollers is arranged between the two, and the two ends of the spring respectively press against the rollers and the heating ring.

6. The integrated well-washing skid equipment according to claim 1 is characterized in that: The hot water device includes a vehicle body, on which is provided a water tank for storing clean water, an electric boiler for heating the clean water to form hot water, and a plurality of reels corresponding to the drainage channels one by one. The water tank and the electric boiler are connected via a liquid adding pipe, the electric boiler is provided with a liquid outlet pipe, and water pumps are installed on the liquid adding pipe and the liquid outlet pipe. The reel is rotatably arranged on the vehicle body, and a second motor for driving the reels to rotate synchronously is installed on the vehicle body. A water pipe is wound around the reel, a liquid inlet end of the water pipe is fixed on the reel and an opening direction of the liquid inlet end is in the same straight line as the central axis of the reel, the liquid inlet end of the water pipe is connected to the outlet of the liquid outlet pipe via a rotating joint, and the liquid outlet end of the water pipe can be connected to the inlet of the drainage channel.

7. The integrated well-washing skid equipment according to claim 6 is characterized in that: The connection points of the two traction ropes on the heating ring and the inlets of the two drainage channels are alternately arranged on the top surface of the heating ring at equal angles around the central axis of the heating ring. The outlet and inlet of the drainage channel are on the same vertical line and the outlet of the drainage channel faces the oil pipe.

8. An oil well hot washing method based on the integrated well washing skid equipment according to any one of claims 1 to 7, characterized in that: The steps include: Step 1: Heat water into hot water through a hot water device, and then transport the hot water into the drainage channel on the heating ring. While the hot water flows spirally from top to bottom along the drainage channel, it also enters the liquid storage chamber through the connecting channel at the upper part of the liquid storage chamber; Step 2: continuously supply hot water to the heating ring so that the hot water can gradually fill the liquid storage cavity and perform heat exchange with the wall of the oil pipe, thereby increasing the temperature of the wall of the oil pipe and causing the wax on the inner wall to melt; Step three, lower the heating ring intermittently through the lifting mechanism, so that the heating ring can clean the wax from the oil pipe section by section from top to bottom.

9. The oil well hot washing method according to claim 8, characterized in that: In the step 2, during the process of dewaxing the oil pipe with the hot water in the liquid storage chamber, the hot water in the liquid storage chamber that exchanges heat with the oil pipe can be discharged from the liquid storage chamber through the connecting channel at the lower part of the liquid storage chamber and flushed on the oil pipe below the heating ring, and the hot water in the upper part of the drainage channel can enter the liquid storage chamber through the connecting channel at the upper part of the liquid storage chamber.

10. The oil well hot washing method according to claim 8, characterized in that: In the step three, during the lifting and lowering process of the heating ring, all the hot water in the liquid storage chamber is discharged outward, so that the hot water in the heating ring flushes the oil pipe located in the moving direction of the heating ring.

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