Equipment for removing dirt from oil wellbore

Abstract

The present invention belongs to the technical field of wellbore descaling, and specifically is a device for removing dirt from oil production wellbores, comprising a cleaning block, a control rod installed on the cleaning block, a scraper installed on the outer wall of the cleaning block, and a closed ring installed on the cleaning block; the interior of the control rod is hollow, a water inlet pipe is installed inside the control rod, a liquid feeding hole and a suction hole are opened in the cleaning block, the liquid feeding hole and the water inlet pipe are interconnected, the suction hole is connected to the internal space of the control rod, and the suction hole and the liquid feeding hole are located between the scrapers; the space inside the control rod is interconnected with an external negative pressure device, and the water inlet pipe is interconnected with an external water pump; the present invention has a simple structure, can improve the effect of cleaning dirt on the inner wall of the wellbore, avoid or reduce the amount of dirt remaining on the inner wall of the wellbore, and promptly discharge the cleaned dirt to the outside of the wellbore to avoid the dirt from adhering again in the wellbore.

Description

Technical Field

[0001] The invention belongs to the technical field of wellbore descaling, in particular to a device for removing dirt from a petroleum production wellbore. Background Art

[0002] With the development of the economy and the improvement of people's living standards, the utilization rate of nature is getting higher and higher. The extraction of oil is a major change for mankind. Oil is mainly used as fuel and gasoline, and is also the raw material for many chemical industrial products, such as solutions, fertilizers, pesticides and plastics. However, in the process of oil extraction, the wellbore is easily adhered to crude oil and other impurities and is difficult to clean. When there is a lot of dirt attached to the wellbore, it will seriously affect the efficiency of oil extraction.

[0003] Existing descaling methods mainly include drilling, hydraulic jetting and chemical dissolution. In the hydraulic jetting method, it is usually necessary to open a radial casing window on the side wall of the casing, and then use a high-pressure pump and a nozzle to pump out high-pressure clean water to clean the attached dirt. However, the high-pressure flushing method cannot effectively remove the dirt attached to the wall of the wellbore, and cannot be cleaned efficiently in one go. It is easy to cause the dirt to re-agglomerate, affecting the cleaning efficiency of the wellbore. At the same time, the dirt washed down by the water flow is also easy to accumulate in the wellbore and is not easy to be discharged to the outside of the wellbore, affecting the subsequent cleaning of the wellbore and oil extraction. Summary of the Invention

[0004] In order to make up for the shortcomings of the existing technology, improve the effect of cleaning dirt on the inner wall of the wellbore, avoid or reduce the amount of dirt remaining on the inner wall of the wellbore, and promptly discharge the cleaned dirt to the outside of the wellbore to avoid the dirt from adhering again in the wellbore, the present invention proposes a device for cleaning dirt in oil production wellbore.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows: the present invention provides a device for removing dirt from an oil wellbore, comprising a cleaning block, a control rod mounted on the cleaning block, a scraper mounted on the outer wall of the cleaning block, closed rings mounted on the upper and lower ends of the outer wall of the cleaning block, and the scraper positioned between the closed rings;

[0006] The interior of the control rod is hollow, and a water inlet pipe is installed inside the control rod. A liquid feeding hole is opened in the cleaning block, and the liquid feeding hole is connected to the water inlet pipe. A suction hole is opened on the cleaning block, and the suction hole is connected to the internal space of the control rod. The scrapers are symmetrically distributed from top to bottom, and the suction hole and the liquid feeding hole are located between the scrapers.

[0007] The space inside the control rod is connected to the external negative pressure equipment, and the water inlet pipe is connected to the external water pump.

[0008] Preferably, a connecting column is installed on the lower surface of the cleaning block, a mounting plate is installed on the lower end of the connecting column, elastic rods are evenly installed on the mounting plate, an elastic membrane is installed on the elastic rods, an elastic ring is installed at the end of the elastic rod, and the elastic membrane is connected to the elastic ring at one end away from the mounting plate;

[0009] The interior of the connecting column is hollow, and a connecting hole is provided in the interior of the cleaning block. The connecting hole connects the internal space of the connecting column with the internal space of the control rod. An entrance is provided at the lower end of the connecting column.

[0010] Preferably, a floating block is slidably mounted on the connecting column, and the floating block closes the entrance at the lower end of the connecting column.

[0011] Preferably, a rotating ring is rotatably mounted on the cleaning block, an annular groove is provided on the side of the rotating ring contacting the cleaning block, the annular groove is communicated with the liquid feeding hole on the cleaning block, and a nozzle arranged along the tangential direction is provided on the rotating ring;

[0012] A rolling block is mounted on the rotating ring via a bracket. A cross-cutting knife is mounted on the surface of the rolling block. The cross-cutting knife contacts dirt on the inner wall of the wellbore. There is relative rotation between the rolling block and the rotating ring.

[0013] Preferably, a vertical cutter is installed at the lower end of the cleaning block, and the vertical cutter is located below the closed ring at the lower end of the upper outer side wall of the cleaning block.

[0014] Preferably, the cleaning block comprises an upper end plate, a middle plate and a lower end plate, and the closed ring and the scraper are located on the outer side walls of the upper end plate and the lower end plate;

[0015] The suction hole is located between the upper end plate and the middle plate, and the liquid delivery hole is located between the middle plate and the lower end plate. The diameter of the middle plate is smaller than that of the upper end plate and the lower end plate, and the lower edge of the middle plate is rounded.

[0016] The scraper on the upper end plate is easy to bend downward, and the scraper on the lower end plate is easy to bend upward.

[0017] Preferably, the nozzle on the rotating ring is aligned with the rolling block.

[0018] Preferably, the blades on the cross-cutting knife are distributed in a spiral shape, and there are gaps between the blades on the cross-cutting knife.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention relates to a device for removing dirt from an oil wellbore, which comprises a cleaning block, a control rod, a water inlet pipe, a scraper and a closed ring. When the cleaning block moves in the wellbore, the scraper cleans the dirt on the inner wall of the wellbore. At the same time, a high-pressure water flow is used through the water inlet pipe to flush the dirt on the inner wall of the wellbore. The dirt cleaned by the water flow and the scraper will be drawn out of the space inside the control rod to the outside of the wellbore, thereby preventing the water flow and dirt from accumulating in the wellbore, thereby improving the cleaning effect and efficiency of the cleaning device on the dirt in the wellbore.

[0021] 2. The present invention relates to a device for removing dirt from oil wellbore, which is equipped with a rotating ring, a rolling block, a horizontal cutting knife and a vertical cutting knife. When the cleaning block moves in the wellbore, it will cut the dirt on the inner wall of the wellbore, so that the dirt is cut into small pieces, which is conducive to the dirt being cleaned off by high-pressure water flow, avoiding or reducing the amount of dirt remaining on the inner wall of the wellbore, and improving the cleaning effect of the cleaning device on the dirt in the wellbore.

[0022] 3. The present invention relates to a device for removing dirt from oil production wellbores. By providing a connecting column, an inlet, a floating block, and an elastic membrane, dirt that falls from the inner wall of the wellbore due to the influence of the cleaning block and water that slides down the cleaning block are intercepted by the elastic membrane, thereby preventing the dirt and water from falling to the bottom of the wellbore. At the same time, the water and dirt intercepted by the elastic membrane will cause the floating block to rise, opening the inlet. Thereafter, the water and dirt are drawn from the inlet and the internal space of the connecting column into the space inside the control rod, and are finally discharged to the outside of the wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a front view of the cleaning device of the present invention;

[0025] Figure 2 is a cross-sectional view of the cleaning device of the present invention;

[0026] Figure 3 It is a schematic structural diagram of a rolling block in a cleaning device of the present invention;

[0027] Figure 4 is a cross-sectional view of a rotating ring in the cleaning device of the present invention;

[0028] Figure 5 yes Figure 2 A partial enlarged view of the middle part;

[0029] Figure 6 yes Figure 2 A partial enlarged view of point B in the middle;

[0030] Figure 7 yes Figure 2 A partial enlarged view of point C in the middle;

[0031] In the figure: cleaning block 1, upper end plate 11, middle plate 12, lower end plate 13, closing ring 14, scraper 15, vertical cutter 16, control rod 2, suction hole 21, connecting hole 22, water inlet pipe 3, liquid feeding hole 31, connecting column 4, elastic membrane 41, mounting plate 411, inlet port 412, elastic rod 413, elastic ring 42, floating block 43, rotating ring 5, rolling block 51, cross-cutting knife 511. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0033] like Figures 1 to 7 As shown, the present invention provides a device for removing dirt from an oil wellbore, comprising a cleaning block 1, a control rod 2 mounted on the cleaning block 1, a scraper 15 mounted on the outer wall of the cleaning block 1, and closed rings 14 mounted at the upper and lower ends of the outer wall of the cleaning block 1, with the scraper 15 located between the closed rings 14;

[0034] The interior of the control rod 2 is hollow, and a water inlet pipe 3 is installed inside the control rod 2. A liquid feeding hole 31 is opened in the cleaning block 1, and the liquid feeding hole 31 is connected to the water inlet pipe 3. A suction hole 21 is opened on the cleaning block 1, and the suction hole 21 is connected to the internal space of the control rod 2. The scrapers 15 are symmetrically distributed from top to bottom, and the suction hole 21 and the liquid feeding hole 31 are located between the scrapers 15.

[0035] The space inside the control rod 2 is connected to the external negative pressure equipment, and the water inlet pipe 3 is connected to the external water pump;

[0036] When cleaning the dirt on the wellbore, the staff sends the cleaning block 1 into the wellbore, and then drives the cleaning block 1 to move in the wellbore through the control rod 2. At the same time, when the cleaning block 1 moves in the wellbore, the high-pressure water flow sent by the external water pump is sprayed from the water inlet pipe 3 and the liquid delivery hole 31 to the inner wall of the wellbore, thereby using the impact of the water flow to clean the dirt on the inner wall of the wellbore, so that the dirt is separated from the inner wall of the wellbore. Since the space inside the control rod 2 is interconnected with the external negative pressure equipment, the suction hole 21 on the cleaning block 1 will have suction, so that the water flow after impacting the inner wall of the wellbore and the dirt carried by the water flow will be sucked into the suction hole 21, and then be sucked out to the outside through the space inside the control rod 2, leaving The inside of the wellbore is prevented from accumulating dirt cleaned from the wellbore and high-pressure water flow used to clean the dirt inside the wellbore, affecting the cleaning effect and the residual water flow affecting the subsequent oil extraction work. At the same time, the water inlet pipe 3 is installed inside the control rod 2 to prevent the water inlet pipe 3 from shaking and entangled inside the wellbore, affecting the normal use of the cleaning equipment. At the same time, the dirt cleaned in the wellbore and the water flow for cleaning the dirt are extracted through the space inside the control rod 2 except the water inlet pipe 3, and the dirt in the wellbore is removed in time, which facilitates the cleaning equipment to continuously clean the dirt on the inner wall of the wellbore, prevents the cleaned dirt from re-accumulating and clogging the wellbore, and improves the use effect and efficiency of the cleaning equipment;

[0037] At the same time, since the cleaning block 1 is equipped with a scraper 15, when the cleaning block 1 moves in the wellbore, the scraper 15 will scrape and move the dirt on the inner wall of the wellbore, thereby facilitating the high-pressure water flow to clean the dirt from the wellbore. At the same time, since a closed ring 14 is installed on the outer wall of the cleaning block 1, the closed ring 14 fills the gap between the cleaning block 1 and the inner wall of the wellbore, thereby avoiding the use of high-pressure water flow to clean the dirt on the inner wall of the wellbore. The water flow falls from the gap between the cleaning block 1 and the inner wall of the wellbore to the bottom of the wellbore, affecting the cleaning effect of the dirt The falling water flow affects the subsequent oil extraction work. At the same time, since the scraper 15 is located between the closed rings 14, after the scraper 15 scrapes or moves the dirt on the inner wall of the wellbore, the dirt will be blocked by the closed ring 14, preventing the dirt from falling directly to the bottom of the wellbore, affecting the cleaning effect of the dirt in the wellbore. In addition, by arranging the suction hole 21 and the liquid delivery hole 31 between the scraper 15, the scraper 15 can scrape or move the dirt on the inner wall of the wellbore, which can be impacted, fallen off and absorbed by the water flow in time, thereby improving the cleaning effect of the inner wall of the wellbore.

[0038] As an embodiment of the present invention, a connecting column 4 is installed on the lower surface of the cleaning block 1, and a mounting plate 411 is installed at the lower end of the connecting column 4. Elastic rods 413 are evenly installed on the mounting plate 411, and an elastic membrane 41 is installed on the elastic rod 413. An elastic ring 42 is installed at the end of the elastic rod 413, and the end of the elastic membrane 41 away from the mounting plate 411 is connected to the elastic ring 42.

[0039] The interior of the connecting column 4 is hollow, and a connecting hole 22 is formed inside the cleaning block 1. The connecting hole 22 connects the interior space of the connecting column 4 with the interior space of the control rod 2. An entrance 412 is formed at the lower end of the connecting column 4.

[0040] Since the sealing ring 14 is installed on the outer wall of the cleaning block 1, when the cleaning block 1 moves inside the wellbore, the dirt that is not firmly attached to the inner wall of the wellbore will fall off under the pressure of the sealing ring 14, and then fall to the bottom of the wellbore, affecting the cleaning effect of the wellbore dirt and affecting the subsequent oil extraction work. At the same time, the elastic rod 413 and the elastic ring 42 installed on the mounting plate 411 will face the inner wall of the wellbore, so that the elastic membrane 41 installed on the elastic rod 413 will expand into a bowl shape, intercepting the dirt falling on the inner wall of the wellbore and preventing the fallen dirt from falling to the bottom of the wellbore. At the same time, in order to prevent the sealing ring 14 on the cleaning block 1 from squeezing and compacting the dirt on the inner wall of the wellbore, the force of the sealing ring 14 on the inner wall of the wellbore is relatively small. Therefore, the high-pressure water flow that impacts the dirt on the inner wall of the wellbore is After crossing the closed ring 14 and falling from the gap between the cleaning block 1 and the inner wall of the wellbore, the elastic membrane 41 is used to intercept the falling water flow to prevent the water flow from falling directly to the bottom of the wellbore, affecting the cleaning effect of the dirt in the wellbore and affecting the subsequent oil extraction work. At the same time, the dirt and water flow intercepted by the elastic membrane 41 will converge at the mounting plate 411 at the bottom of the elastic membrane 41 and submerge the inlet 412 at the lower end of the connecting column 4. At the same time, since the space inside the connecting column 4 is connected to the space inside the control rod 2 through the connecting hole 22, the dirt and water flow at the bottom of the elastic membrane 41 enter the space inside the control rod 2 from the inlet 412 and the space inside the connecting column 4, and are finally drawn out to the outside of the wellbore, avoiding the accumulation of dirt and water flow that fall to the bottom of the elastic membrane 41 and affecting the normal operation of the cleaning equipment.

[0041] As an embodiment of the present invention, a floating block 43 is slidably mounted on the connecting column 4, and the floating block 43 closes the inlet 412 at the lower end of the connecting column 4;

[0042] When dirt and water accumulate at the bottom of the elastic membrane 41, the floating block 43 will contact the dirt and water, causing the floating block 43 to move upward under the action of buoyancy, so that the inlet 412 on the connecting column 4 is opened, making it convenient for the dirt and water accumulated at the bottom of the elastic membrane 41 to be extracted into the space inside the control rod 2 and then sent to the outside of the wellbore. At the same time, when the dirt and water at the bottom of the elastic membrane 41 are extracted, the floating block 43 falls again under the action of its own gravity and re-closes the inlet 412 on the connecting column 4, preventing the inlet 412 from being always in the open state, resulting in the failure of the negative pressure in the space inside the control rod 2, and the inability to quickly and effectively extract the dirt cleaned from the inner wall of the wellbore and the water used to clean the dirt from the wellbore, thereby preventing the dirt and water from accumulating inside the wellbore, affecting the cleaning effect of the dirt on the inner wall of the wellbore and affecting subsequent oil production work.

[0043] As an embodiment of the present invention, a rotating ring 5 is rotatably mounted on the cleaning block 1, and an annular groove is provided on the side of the rotating ring 5 that contacts the cleaning block 1. The annular groove is communicated with the liquid feeding hole 31 on the cleaning block 1, and a nozzle is provided on the rotating ring 5 along the tangential direction.

[0044] A rolling block 51 is mounted on the rotating ring 5 via a bracket. A crosscutting knife 511 is mounted on the surface of the rolling block 51. The crosscutting knife 511 contacts dirt on the inner wall of the wellbore. The rolling block 51 and the rotating ring 5 rotate relative to each other.

[0045] When the high-pressure water flow sent by the external water pump is ejected from the liquid delivery hole 31, the water flow enters the annular groove on the rotating ring 5. At the same time, when the water flow is ejected from the nozzle arranged along the tangential direction of the rotating ring 5, the reaction force of the water flow will drive the rotating ring 5 to rotate, so that the water flow cleans the circumference of the inner wall of the wellbore, effectively removing the dirt on the inner wall of the wellbore. At the same time, since the rolling block 51 is installed on the rotating ring 5, when the rotating ring 5 rotates, the rolling block 51 will rotate synchronously with the rotating ring 5, so that the cross-cutting knife 511 on the rolling block 51 cuts the dirt on the inner wall of the wellbore, so that the dirt on the inner wall of the wellbore is split into multiple Small pieces of dirt, so when the water flow hits the inner wall of the wellbore, it is convenient for the water flow to flush and clean the small pieces of dirt from the inner wall of the wellbore, thereby improving the cleaning effect of the dirt on the inner wall of the wellbore and reducing the residual dirt on the inner wall of the wellbore. At the same time, when the rolling block 51 rotates with the rotating ring 5, the cross-cutting knife 511 on the rolling block 51 cuts the dirt on the inner wall of the wellbore. The rolling block 51 and the cross-cutting knife 511 on the rolling block 51 will also cause a certain disturbance to the dirt, further promoting the dirt to fall off from the inner wall of the wellbore, reducing the residual dirt on the inner wall of the wellbore, and further improving the cleaning effect of the dirt on the inner wall of the wellbore.

[0046] As an embodiment of the present invention, a vertical cutter 16 is installed at the lower end of the cleaning block 1, and the vertical cutter 16 is located below the closed ring 14 at the lower end of the upper outer wall of the cleaning block 1;

[0047] When the cleaning block 1 moves in the wellbore, the vertical cutting knife 16 installed at the lower end of the cleaning block 1 will cut the dirt on the inner wall of the wellbore, so that the dirt on the inner wall of the wellbore is cut into a plurality of vertical strips along the vertical direction. Afterwards, as the cleaning block 1 moves in the wellbore, the dirt on the inner wall of the wellbore that has been cut into vertical strips will contact the cross-cutting knife 511 on the rolling block 51, so that under the action of the cross-cutting knife 511, the vertical strips of dirt are further cut into small pieces along the horizontal direction. At the same time, after the dirt is cut into small pieces, when the water flow impacts the dirt At the same time, the water flow will enter the space between the dirt and the inner wall of the wellbore through the gaps cut by the cross-cutting knife 511 and the vertical cutting knife 16 on the dirt, thereby increasing the impact effect of the water flow on the dirt, thereby facilitating the cleaning effect of the water flow on the dirt. At the same time, in the process of the cross-cutting knife 511 and the vertical cutting knife 16 cutting the dirt, the cross-cutting knife 511 and the vertical cutting knife 16 will further disturb the dirt, causing looseness between the dirt and the inner wall of the wellbore, making it easier for the dirt to break away from the inner wall of the wellbore when impacted by the water flow, thereby improving the cleaning effect of the dirt on the inner wall of the wellbore and improving the working effect of the cleaning equipment.

[0048] As an embodiment of the present invention, the cleaning block 1 includes an upper end plate 11, a middle plate 12 and a lower end plate 13, and the closed ring 14 and the scraper 15 are located on the outer side walls of the upper end plate 11 and the lower end plate 13;

[0049] The suction hole 21 is located between the upper end plate 11 and the middle plate 12, and the liquid delivery hole 31 is located between the middle plate 12 and the lower end plate 13. The diameter of the middle plate 12 is smaller than that of the upper end plate 11 and the lower end plate 13, and the lower edge of the middle plate 12 is rounded.

[0050] The scraper 15 on the upper end plate 11 is easy to bend downward, and the scraper 15 on the lower end plate 13 is easy to bend upward;

[0051] The suction hole 21 and the liquid delivery hole 31 are separated by the middle plate 12 to prevent the liquid ejected from the liquid delivery hole 31 from entering the suction hole 21 before contacting the inner wall of the well and the dirt on the inner wall, thereby affecting the impact of the water flow on the inner wall of the well and the cleaning effect of the dirt. At the same time, due to the rounded corners at the lower edge of the middle plate 12, the water flow that impacts the inner wall of the well and the dirt can easily enter between the middle plate 12 and the upper end plate 11, thereby The carried dirt is sucked into the suction hole 21, and finally the water flow and dirt are sent to the outside of the wellbore, completing the cleaning of the wellbore. At the same time, since the scraper 15 on the upper end plate 11 and the scraper 15 on the lower end plate 13 are easy to bend toward the position of the middle plate 12, when the cleaning block 1 moves downward in the wellbore, the dirt on the inner wall of the wellbore is easy to pass through the scraper 15 on the lower end plate 13, and it is not easy for the dirt to be scraped off by the scraper 15 on the lower end plate 13, causing the dirt to fall to the bottom of the wellbore. The dirt on the inner wall of the wellbore will be scraped off by the scraper 15 on the upper end plate 11, so as to prevent the dirt on the inner wall of the wellbore from passing over the upper end plate 11 on the cleaning block 1 and affecting the cleaning effect of the dirt on the inner wall of the wellbore. In addition, the dirt cleaned by the scraper 15 on the upper end plate 11 will be carried by the water flow, and thus enter the suction hole 21 with the water flow and be sent to the outside of the wellbore. At the same time, when the cleaning block 1 moves upward in the wellbore, the upper end plate 11 will be used to remove the dirt on the inner wall of the wellbore. The scraper 15 on the end plate 11 is easy to bend, so that the dirt on the inner wall of the wellbore will not be scraped off by the scraper 15 on the upper end plate 11, affecting the cleaning effect of the dirt on the inner wall of the wellbore. In addition, the dirt on the inner wall of the wellbore will be cleaned by the scraper 15 on the lower end plate 13, causing the dirt to fall above the upper end plate 11. The fallen dirt is then impacted by the water flow sprayed from the liquid delivery hole 31, causing the dirt to be carried by the water flow and enter the suction hole 21, and finally be sent out to the outside of the wellbore.

[0052] As an embodiment of the present invention, the nozzle on the rotating ring 5 is aligned with the rolling block 51;

[0053] Since the rolling block 51 is aligned with the nozzle on the rotating ring 5, the water flow sprayed from the rotating ring 5 will impact the rolling block 51. Since the rolling block 51 and the cross-cutting knife 511 on the rolling block 51 will contact the dirt on the inner wall of the wellbore, dirt will be attached to the rolling block 51 and the cross-cutting knife 511 on the rolling block 51. The water flow sprayed from the nozzle of the rotating ring 5 will clean the rolling block 51 and the cross-cutting knife 511 on the rolling block 51, avoiding excessive dirt from adhering to the rolling block 51 and the cross-cutting knife 511 on the rolling block 51, affecting the rolling block 51 and the cross-cutting knife 511 in cutting the dirt on the inner wall of the wellbore, thereby ensuring the cleaning effect of the cleaning equipment on the dirt on the inner wall of the wellbore.

[0054] As an embodiment of the present invention, the blades on the crosscutting knife 511 are distributed in a spiral shape, and there are gaps between the blades on the crosscutting knife 511;

[0055] Since the cleaning block 1 moves inside the wellbore, the crosscutting knife 511 is perpendicular to or at an angle to the moving direction of the cleaning block 1. Therefore, when the cleaning block 1 moves inside the wellbore, the crosscutting knife 511 will be blocked by dirt, affecting the normal use of the crosscutting knife 511 or causing damage to the crosscutting knife 511. At the same time, the blades of the crosscutting knife 511 are distributed in a spiral shape on the rolling block 51. When the rolling block 51 rolls along the wellbore, it is affected by the spiral distribution of the blades on the crosscutting knife 511, which can reduce the impact of dirt on the crosscutting knife 511 when the cleaning block 1 moves. 1 has an obstructing effect, ensuring the cross-cutting knife 511's cutting effect on the dirt, which is conducive to the flow of water into the dirt and cleaning it off the inner wall of the wellbore. At the same time, due to the gaps between the blades on the cross-cutting knife 511, the cross-cutting knife 511 on the rolling block 51 can be deformed to a certain extent when the cleaning block 1 moves, so as to complete the cutting of the dirt, thereby avoiding the cross-cutting knife 511 being damaged or the cross-cutting knife 511 being obstructed by dirt when the cleaning block 1 moves, resulting in the cross-cutting knife 511 scraping the dirt and damaging the cross-cutting knife 511.

[0056] The specific workflow is as follows:

[0057] When cleaning the dirt on the wellbore, the staff sends the cleaning block 1 into the wellbore, and then drives the cleaning block 1 to move in the wellbore through the control rod 2. At the same time, when the cleaning block 1 moves in the wellbore, the high-pressure water flow sent by the external water pump is sprayed from the water inlet pipe 3 and the liquid delivery hole 31 to the inner wall of the wellbore, so that the dirt is separated from the inner wall of the wellbore. Since the space inside the control rod 2 is connected to the external negative pressure equipment, the suction hole 21 on the cleaning block 1 will have suction, so that the water flow after hitting the inner wall of the wellbore and the dirt carried by the water flow will be sucked into the suction hole 21, and then be sucked out to the outside through the space inside the control rod 2 and leave the interior of the wellbore;

[0058] At the same time, since the cleaning block 1 is equipped with a scraper 15, when the cleaning block 1 moves in the wellbore, the scraper 15 will scrape and remove the dirt on the inner wall of the wellbore. At the same time, since the outer wall of the cleaning block 1 is equipped with a closed ring 14, the closed ring 14 fills the gap between the cleaning block 1 and the inner wall of the wellbore;

[0059] At the same time, the elastic rod 413 and the elastic ring 42 installed on the mounting plate 411 will face the inner wall of the wellbore, so that the elastic membrane 41 installed on the elastic rod 413 will expand into a bowl shape to intercept the dirt falling on the inner wall of the wellbore. At the same time, in order to prevent the closed ring 14 on the cleaning block 1 from squeezing the dirt on the inner wall of the wellbore and compacting the dirt on the inner wall of the wellbore, the force of the closed ring 14 on the inner wall of the wellbore is relatively small. Therefore, the high-pressure water flow that impacts the dirt on the inner wall of the wellbore has the possibility of passing over the closed ring 14 and passing through the space between the cleaning block 1 and the inner wall of the wellbore. The elastic membrane 41 intercepts the falling water flow. At the same time, the dirt and water flow intercepted by the elastic membrane 41 converge to the mounting plate 411 at the bottom of the elastic membrane 41 and submerge the inlet 412 at the lower end of the connecting column 4. At the same time, since the space inside the connecting column 4 is connected to the space inside the control rod 2 through the connecting hole 22, the dirt and water flow at the bottom of the elastic membrane 41 enter the space inside the control rod 2 through the inlet 412 and the space inside the connecting column 4, and are finally pumped out of the wellbore.

[0060] When dirt and water accumulate at the bottom of the elastic membrane 41, the floating block 43 contacts the dirt and water, causing the floating block 43 to move upward under the action of buoyancy, thereby opening the inlet 412 on the connecting column 4. This facilitates the extraction of the dirt and water accumulated at the bottom of the elastic membrane 41 into the space inside the control rod 2 and then to the outside of the wellbore. At the same time, when the dirt and water at the bottom of the elastic membrane 41 are completely extracted, the floating block 43 falls again under the action of its own gravity and re-seals the inlet 412 on the connecting column 4.

[0061] When the high-pressure water flow sent by the external water pump is ejected from the liquid delivery hole 31, the water flow enters the annular groove on the rotating ring 5. At the same time, when the water flow is ejected from the nozzle arranged along the tangential direction of the rotating ring 5, the reaction force of the water flow will drive the rotating ring 5 to rotate, so that the water flow cleans the circumference of the inner wall of the wellbore. At the same time, since the rolling block 51 is installed on the rotating ring 5, when the rotating ring 5 rotates, the rolling block 51 will rotate synchronously with the rotating ring 5, so that the cross-cutting knife 511 on the rolling block 51 cuts the dirt on the inner wall of the wellbore, so that the dirt on the inner wall of the wellbore is divided into multiple small pieces of dirt. When the water flow impacts the inner wall of the wellbore, the water flow can easily flush and clean the small pieces of dirt from the inner wall of the wellbore.

[0062] When the cleaning block 1 moves in the wellbore, the vertical cutting blade 16 installed at the lower end of the cleaning block 1 will cut the dirt on the inner wall of the wellbore, so that the dirt on the inner wall of the wellbore is cut into a plurality of vertical strips along the vertical direction. Afterwards, as the cleaning block 1 moves in the wellbore, the dirt on the inner wall of the wellbore that has been cut into vertical strips will contact the cross-cutting blade 511 on the rolling block 51, so that under the action of the cross-cutting blade 511, the vertical strips of dirt are further cut into small pieces along the horizontal direction. At the same time, after the dirt is cut into small pieces, when the water flow impacts the dirt, the water flow will enter between the dirt and the inner wall of the wellbore through the gaps cut by the cross-cutting blade 511 and the vertical cutting blade 16 on the dirt, thereby improving the impact effect of the water flow on the dirt.

[0063] The suction hole 21 and the liquid feeding hole 31 are separated by the middle plate 12 to prevent the liquid sprayed from the liquid feeding hole 31 from entering the suction hole 21 before contacting the inner wall of the wellbore and the dirt on the inner wall. At the same time, due to the rounded corners at the lower edge of the middle plate 12, the water flow that impacts the inner wall of the wellbore and the dirt can easily enter between the middle plate 12 and the upper end plate 11. At the same time, since the scraper 15 on the upper end plate 11 and the scraper 15 on the lower end plate 13 are easy to bend toward the position of the middle plate 12, when the cleaning block 1 moves downward in the wellbore, the dirt on the inner wall of the wellbore can easily pass through the scraper 15 on the lower end plate 13, and it is not easy for the dirt to be scraped off by the scraper 15 on the lower end plate 13. In addition, the inner wall of the wellbore The dirt on the inner wall of the wellbore will be scraped off by the scraper 15 on the upper end plate 11. In addition, the dirt cleaned by the scraper 15 on the upper end plate 11 will be carried by the water flow, and thus enter the suction hole 21 with the water flow and be sent to the outside of the wellbore. At the same time, when the cleaning block 1 moves upward in the wellbore, the scraper 15 on the upper end plate 11 is easy to bend, so that the dirt on the inner wall of the wellbore will not be scraped off by the scraper 15 on the upper end plate 11. In addition, the dirt on the inner wall of the wellbore will be cleaned by the scraper 15 on the lower end plate 13, so that the dirt falls to the top of the upper end plate 11, and then the fallen dirt is impacted by the water flow sprayed from the liquid feeding hole 31, so that the dirt is carried by the water flow and enters the suction hole 21, and is finally sent to the outside of the wellbore.

[0064] Since the rolling block 51 is aligned with the nozzle on the rotating ring 5, the water flow sprayed from the rotating ring 5 will impact the rolling block 51, cleaning the rolling block 51 and the cross-cutting knife 511 on the rolling block 51, thereby preventing excessive dirt from adhering to the rolling block 51 and the cross-cutting knife 511 on the rolling block 51;

[0065] At the same time, the blades of the cross-cutter 511 are distributed in a spiral shape on the rolling block 51. When the rolling block 51 rolls along the wellbore, the spiral distribution of the blades on the cross-cutter 511 can reduce the obstruction of dirt on the cross-cutter 511 when the cleaning block 1 moves, thereby ensuring the cross-cutter 511's effect in cutting the dirt. At the same time, due to the gaps between the blades on the cross-cutter 511, the cross-cutter 511 on the rolling block 51 can be deformed to a certain extent when the cleaning block 1 moves, so as to complete the cutting of the dirt.

[0066] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for removing dirt from an oil wellbore, comprising a cleaning block (1), a control rod (2) mounted on the cleaning block (1), a scraper (15) mounted on the outer side wall of the cleaning block (1), closed rings (14) mounted at the upper and lower ends of the outer side wall of the cleaning block (1), and the scraper (15) located between the closed rings (14); Its characteristics are: The control rod (2) is hollow inside, and a water inlet pipe (3) is installed inside the control rod (2). A liquid feeding hole (31) is provided in the cleaning block (1), and the liquid feeding hole (31) and the water inlet pipe (3) are communicated with each other. A suction hole (21) is provided on the cleaning block (1), and the suction hole (21) is communicated with the internal space of the control rod (2). The scrapers (15) are symmetrically distributed from top to bottom, and the suction hole (21) and the liquid feeding hole (31) are located between the scrapers (15). The space inside the control rod (2) is interconnected with an external negative pressure device, and the water inlet pipe (3) is interconnected with an external water pump; A connecting column (4) is mounted on the lower surface of the cleaning block (1); a mounting plate (411) is mounted on the lower end of the connecting column (4); elastic rods (413) are evenly mounted on the mounting plate (411); an elastic membrane (41) is mounted on the elastic rods (413); an elastic ring (42) is mounted on the end of the elastic rods (413); and one end of the elastic membrane (41) away from the mounting plate (411) is connected to the elastic ring (42); The interior of the connecting column (4) is hollow, and a connecting hole (22) is provided inside the cleaning block (1). The connecting hole (22) connects the interior space of the connecting column (4) with the interior space of the control rod (2). An entrance (412) is provided at the lower end of the connecting column (4); A floating block (43) is slidably mounted on the connecting column (4), and the floating block (43) closes the inlet (412) at the lower end of the connecting column (4).

2. The equipment for removing dirt from a petroleum wellbore according to claim 1, characterized in that: A rotating ring (5) is rotatably mounted on the cleaning block (1), and an annular groove is provided on the side of the rotating ring (5) contacting the cleaning block (1), the annular groove is communicated with the liquid feeding hole (31) on the cleaning block (1), and a nozzle is provided on the rotating ring (5) arranged along a tangential direction; A rolling block (51) is mounted on the rotating ring (5) via a bracket, a cross-cutting knife (511) is mounted on the surface of the rolling block (51), and the cross-cutting knife (511) contacts dirt on the inner wall of the wellbore, and relative rotation occurs between the rolling block (51) and the rotating ring (5).

3. The equipment for removing dirt from a petroleum wellbore according to claim 2, characterized in that: A vertical cutter (16) is installed at the lower end of the cleaning block (1), and the vertical cutter (16) is located below the closed ring (14) at the lower end of the upper outer wall of the cleaning block (1).

4. The equipment for removing dirt from oil wellbore according to claim 1, characterized in that: The cleaning block (1) comprises an upper end plate (11), an intermediate plate (12) and a lower end plate (13); the closed ring (14) and the scraper (15) are located on the outer side walls of the upper end plate (11) and the lower end plate (13); The suction hole (21) is located between the upper end plate (11) and the middle plate (12), and the liquid delivery hole (31) is located between the middle plate (12) and the lower end plate (13). The diameter of the middle plate (12) is smaller than the diameters of the upper end plate (11) and the lower end plate (13). The lower edge of the middle plate (12) is rounded. The scraper (15) on the upper end plate (11) is easy to bend downward, and the scraper (15) on the lower end plate (13) is easy to bend upward.

5. The equipment for removing dirt from oil wellbore according to claim 2, characterized in that: The nozzle on the rotating ring (5) is aligned with the rolling block (51).

6. The equipment for removing dirt from oil wellbore according to claim 2, characterized in that: The blades on the cross-cutting knife (511) are distributed in a spiral shape, and there are gaps between the blades on the cross-cutting knife (511).

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