CN209603937U - Paraffin removal pipe rod column of oil well - Google Patents

Abstract

The utility model discloses a paraffin removal pipe pole of oil well belongs to oil field development technical field. This paraffin removal pipe pole includes: the oil well pump comprises an oil well pump cylinder and an oil well pump plunger; the lower end of the first sucker rod is connected with the upper end of the second sucker rod through an adapter, and the first sucker rod, the adapter and the second sucker rod are positioned in the first oil pipe and form an annular space with the first oil pipe; the lower extreme and the oil-well pump plunger of second sucker rod are connected, the lower extreme of first oil pipe is connected with the upper end of oil-well pump barrel, be provided with the well-flushing valve in the first sucker rod, the well-flushing valve is used for being in the open mode under the pressure of the hot washing medium of pouring into in first sucker rod, make the hot washing medium flow out from the well-flushing valve in order to wash the wax deposition in the oil well, the oil-well pump is used for discharging the hot washing medium to ground from the annular space, thereby can avoid hot washing medium contact stratum to cause the stratum pollution, can also improve well-flushing efficiency simultaneously.

Description

Oil well wax removal pipe string

technical field

The utility model belongs to the technical field of oil field development, in particular to a wax removal pipe and rod column of an oil well.

Background technique

Crude oil is a mixture solution composed of hydrocarbons, including paraffin, etc. During the exploitation of the oil field, when the crude oil rises from the bottom of the oil well and flows to the oil pipe, the temperature of the crude oil gradually decreases, and the paraffin gradually precipitates and accumulates on the This phenomenon is called oil well waxing. When the phenomenon of wax deposition in the oil well occurs, the cross section of the oil pipe may become smaller and blockage, which will affect the crude oil production of the oil well. Therefore, it is necessary to regularly remove the wax deposition of the oil well, carry out daily maintenance and management of the oil well, and ensure the normal production of the oil well.

In the related art, when wax removal is performed on an oil well, a hot washing medium is usually injected from the oil casing annulus to clean the wax deposits in the oil well. The oil casing annulus refers to the annular space between the tubing and the casing. The oil well pump pumps the hot washing medium that enters the second oil pipe through the air anchor into the pump barrel of the oil well pump, and then discharges the hot washing medium from the pump barrel to the first oil pipe through the oil well pump, and finally the hot washing medium is discharged from the oil pipe and the oil well pump by the oil well pump. The annular space between the sucker rods is drained.

However, the above method needs to inject the hot washing medium into the annulus of the oil jacket, so when the hot washing medium is injected into the annular space of the tubing and the casing by pressure, the hot washing medium may flow from the annulus of the oil jacket due to the contact between the casing and the formation. formation, causing formation pollution, and at the same time, well killing may occur, affecting formation crude oil entering the wellbore, resulting in a decrease in crude oil production from the oil well. On the other hand, since the depth of the casing is usually greater than the running depth of the pipe string, a large amount of hot washing medium is required to clean the wax in the oil well through the above method, and the water content of the crude oil in the oil well after the well washing is high, requiring more A long drainage period is required to restore the well to normal production.

Utility model content

The utility model provides a wax removal pipe and rod column of an oil well, which can prevent the formation from being polluted while cleaning the wax deposition of the oil well, and ensure the crude oil output of the oil well. Described technical scheme is as follows:

The utility model provides a wax removal pipe and rod column of an oil well. The wax removal pipe and rod string includes: a first sucker rod, a conversion joint, a second sucker rod, a first oil pipe and a pump. The sucker rod is a hollow sucker rod, and the oil pump includes a pump barrel and a plunger of the pump;

The lower end of the first sucker rod is connected to the upper end of the second sucker rod through the adapter, and the first sucker rod, the adapter and the second sucker rod are located at the first in an oil pipe, and forms an annular space with the first oil pipe;

The lower end of the second sucker rod is connected to the plunger of the oil well pump, the lower end of the first oil pipe is connected to the upper end of the pump barrel of the oil well pump, and a well flushing valve is arranged inside the first sucker rod, The well flushing valve is used to be in an open state under the pressure of the heat washing medium injected into the first sucker rod, so that the heat washing medium flows out from the well flushing valve to clean wax deposits in the oil well , the oil well pump is used to discharge the hot washing medium from the annular space to the ground.

Optionally, the wax removal pipe string also includes a polished rod and a well-flushing tee, the upper end of the polished rod is connected to the pumping unit on the ground, and the lower end of the polished rod is connected to the first end of the well-flushing tee connection, the second end of the well-flushing tee is connected to the upper end of the first sucker rod, the third end of the well-flushing tee is used to inject the hot washing medium, and the well-flushing tee The first end and the second end are located on a straight line.

Optionally, the wax removal pipe string also includes a second oil pipe, an air anchor, a third oil pipe and a plug;

The lower end of the pump barrel of the oil well pump is connected to the upper end of the second oil pipe, the lower end of the second oil pipe is connected to the upper end of the air anchor, and the lower end of the air anchor is connected to the upper end of the third oil pipe, The lower end of the third oil pipe is connected with the plug.

Optionally, the second sucker rod is a solid sucker rod.

Optionally, the well flushing valve is a check valve.

Optionally, the hot washing medium refers to a medium whose temperature is within a reference temperature range, and the lower limit of the reference temperature range is higher than the waxing point of crude oil.

Optionally, the well flushing valve is located within a reference depth range, and the reference depth range refers to the depth range where the wax deposit is located in the oil well.

The beneficial effect of the technical solution provided by the utility model is that: in the utility model, when using the wax removal pipe column to clean the wax deposition of the oil well, the hot washing medium can be injected into the first depth direction from the wellhead of the oil well through pressure. sucker rod, so that the well flushing valve arranged in the first sucker rod is in an open state under this pressure. Then, the hot washing medium can flow from the first sucker rod to the annular space through the well washing valve to clean the wax deposit in the oil well, and the hot washing medium is discharged from the annular space to the ground through the oil well pump. In this way, it is possible to prevent the hot washing medium from pouring into the formation, causing formation pollution, ensuring the crude oil production of the oil well, and solving the problem that the pressure of the injected hot washing medium affects the crude oil production of the oil well. Hot washing medium reduces the consumption of hot washing medium, simplifies the well washing process and improves the well washing rate.

Description of drawings

Fig. 1 is a schematic structural view of a wax removal pipe and rod column of an oil well provided by an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of another oil well wax removal pipe and rod column provided by the embodiment of the present invention;

Fig. 3 is a structural schematic diagram of another wax removal pipe and rod string for an oil well provided by an embodiment of the present invention.

Reference signs:

1: first sucker rod; 101: well flushing valve;

2: Adapter; 3: Second sucker rod; 4: First oil pipe;

5: oil well pump; 501: oil well pump barrel; 502: oil well pump plunger;

6: polished rod; 7: well flushing tee; 8: second tubing; 9: gas anchor; 10: third tubing; 11: plug.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the implementation of the present utility model will be further described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic structural view of a wax removal pipe and rod string for an oil well provided by an embodiment of the utility model. As shown in the accompanying drawing 1, the wax removal pipe and rod column includes: the first sucker rod 1, the conversion joint 2, the second sucker rod 3, the first oil pipe 4 and the oil pump 5, and the first sucker rod 1 is hollow The oil sucker rod, the oil well pump 5 includes the oil well pump barrel 501 and the oil well pump plunger 502;

The lower end of the first sucker rod 1 is connected to the upper end of the second sucker rod 3 through the adapter 2, and the first sucker rod 1, the adapter 2 and the second sucker rod 3 are located in the first oil pipe 4, and are connected with the second oil sucker rod. An oil pipe 4 forms an annular space;

The lower end of the second sucker rod 3 is connected to the plunger 502 of the oil well pump, the lower end of the first oil pipe 4 is connected to the upper end of the pump barrel 501 of the oil well pump, and the well flushing valve 101 is arranged inside the first sucker rod 1 , and the well flushing valve 101 It is used to open under the pressure of the hot washing medium injected into the first sucker rod 1, so that the hot washing medium flows out from the well washing valve 101 to clean the wax deposit in the oil well, and the oil well pump 5 is used to take the hot washing medium from The annular space vents to the ground.

In the embodiment of the present utility model, when using the wax removal pipe and rod string to clean the wax deposits in the oil well, the hot washing medium can be injected into the first sucker rod 1 from the direction indicated by the arrow in Fig. The well flushing valve 101 in the sucker rod 1 is in an open state under this pressure. Then, the hot washing medium can flow from the first sucker rod 1 to the annular space through the well washing valve 101 to clean the wax deposit in the oil well, and the hot washing medium is discharged from the annular space to the ground through the oil well pump 5 . In this way, the hot-washing medium is injected from the first sucker rod 1, and the well-washing channel is established through the well-washing valve 101 set in the first sucker rod 1, and is discharged from the annular space, thereby forming a positive cycle to clean the wax deposition in the oil well. cleaning. Since the heat washing medium of the first oil pipe 4 is isolated from the inside of the oil well pump barrel 501 by the oil well pump barrel 501, when the heat washing medium is used to clean the wax deposition of the oil well, the heat washing medium cannot enter the oil well pump barrel 501, Then it flows out from the pump barrel 501 of the oil pump and flows into the formation through the gas anchor, so as to avoid the occurrence of backflow of the hot washing medium into the formation and cause formation pollution, ensure the crude oil production of the oil well, and solve the problem that the pressure of the injected hot washing medium affects the crude oil production of the oil well The problem. At the same time, there is no need to inject hot washing medium through the oil casing annulus, which reduces the consumption of hot washing medium, simplifies the well washing process, and improves the well washing rate.

Wherein, the hot washing medium refers to the medium whose temperature is within the reference temperature range, and the lower limit of the reference temperature range is higher than the waxing point of crude oil.

Usually crude oil contains a certain amount of paraffin. When the temperature of crude oil is lower than the temperature of the waxing point of crude oil, paraffin will gradually precipitate from crude oil and accumulate in the pipe wall of the oil pipe. Therefore, when using hot washing medium to clean wax deposits in oil wells, it is necessary to ensure that the temperature of the hot washing medium is higher than the waxing point of crude oil, so that the wax deposited on the tubing wall can be melted and mixed into the hot washing medium. And through the oil well pump 5, it is discharged from the annular space to the ground together with the hot washing medium. Moreover, the waxing point is related to the content of paraffin in crude oil. Generally, the higher the wax content in crude oil, the higher the waxing point of crude oil.

Wherein, the well flushing valve 101 is located within a reference depth range, and the reference depth range refers to the depth range where the wax deposition is located in the oil well.

The reference depth range can be preset. Because when the crude oil rises from the bottom of the oil well and flows through the oil pipe, the temperature of the crude oil gradually decreases. When the temperature of the crude oil decreases to the waxing point of the crude oil, the paraffin begins to precipitate. The depth range between the wellhead positions is the depth range where the wax deposition is located in the oil well. Typically, wax deposits are located in wells at depths up to 1,000 meters.

It should be noted that, in the embodiment of the utility model, the well flushing valve 101 can be set within the reference depth range, or the well flushing valve 101 can be set at the lower limit of the reference depth range, or the well flushing valve 101 can also be set at the lower limit of the reference depth range. It is set at a depth lower than the lower limit of the reference depth range, as long as it is ensured that the hot washing medium flows out of the well flushing valve 101 to clean the wax deposit within the reference range.

Due to the wax removal pipe and rod column of the oil well provided by the embodiment of the utility model, when the wax deposition of the oil well is cleaned, the hot washing medium is injected from the first sucker rod 1, and the well washing valve is set within the reference range, The hot washing medium flows out directly through the well washing valve 101, so that all wax deposits within the reference range can be cleaned. There is no need for a large amount of hot washing medium to enter the oil pipe from the oil jacket annulus through the air anchor, and the hot washing medium is drawn into the pump barrel by the oil well pump, and then pumped out to the annular space, reducing the amount of hot washing medium and saving At the same time, it simplifies the well cleaning process, shortens the waxing time of cleaning oil wells, and improves the well cleaning efficiency.

Optionally, the well flushing valve 101 may be a one-way valve. Of course, the well flushing valve 101 can also be other valves that can be opened under the pressure of injecting the hot flushing medium, which is not limited by the embodiment of the present invention.

Wherein, the second sucker rod 3 may be a hollow sucker rod, or a solid sucker rod, or other types of sucker rods, which are not limited in this embodiment of the present invention.

When the second sucker rod 3 is a hollow sucker rod, the connection between the first sucker rod 1 and the second sucker rod 3 can be sealed through the conversion joint 2, so that the hot washing medium flows out directly from the well flushing valve 101, while Will not flow into the second sucker rod 3. Of course, it is also possible to connect only the first sucker rod 1 and the second sucker rod 2 through the conversion joint 2. Valve 101 flows out.

When the second sucker rod 3 is a solid sucker rod, there is no need to seal between the first sucker rod 1 and the second sucker rod 3, and when the hot washing medium is injected into the first sucker rod 1, the heat The washing medium will not flow into the second sucker rod 3, which can further reduce the consumption of hot washing medium and save the cost.

Usually, the second sucker rod 3 can be composed of one-stage sucker rods, or two-stage sucker rods, and the outer diameters of the same-stage sucker rods are the same. And the outer diameter of the second sucker rod 3 is usually smaller than the outer diameter of the first sucker rod 1 .

For example, a hollow sucker rod with an outer diameter of 36 mm can be selected for the first sucker rod, and a sucker rod with an outer diameter of 22 mm can be selected for the second sucker rod 3 .

Considering that the closer the sucker rod is to the wellhead, the load-bearing is heavier, in order to reduce the load-bearing of the sucker rod, usually the second sucker rod 3 can be selected to be composed of two-stage sucker rods. That is, two levels of sucker rods with different outer diameters are selected to form the second sucker rod 3 . For example, select sucker rods with an outer diameter of 22 mm and an outer diameter of 19 mm to form the second sucker rod 3 .

In a possible implementation, as shown in Figure 2, the wax removal pipe and rod column provided by the embodiment of the present invention also includes a polished rod 6 and a well cleaning tee 7, and the upper end of the polished rod 6 is connected to the pumping unit on the ground , the lower end of the polished rod 6 is connected with the first end of the flushing tee 7, the second end of the flushing tee 7 is connected with the upper end of the first sucker rod 1, and the third end of the flushing tee 7 is used for injecting heat For washing the medium, the first end and the second end of the well washing tee 7 are located on a straight line.

In order to facilitate the connection between the first sucker rod 1 and the pumping unit on the ground, inject hot washing medium into the first sucker rod 1, connect the pumping unit on the ground through the polished rod 6, and pass the well washing tee 7 The first end and the second end located in a straight line are connected to the first sucker rod 1 and the polished rod 6, so as to connect the first sucker rod 1 and the pumping unit on the ground, and can pass through the first sucker rod 7 of the well cleaning tee The three ends inject hot washing medium into the first sucker rod 1 according to the direction indicated by the arrow in FIG. 2 .

Further, as shown in FIG. 3 , the wax removal pipe and rod column of the oil well provided by the embodiment of the present invention may also include a second oil pipe 8, an air anchor 9, a third oil pipe 10 and a plug 11; The lower end is connected with the upper end of the second oil pipe 8, the lower end of the second oil pipe 8 is connected with the upper end of the air anchor 9, the lower end of the air anchor 9 is connected with the upper end of the third oil pipe 10, and the lower end of the third oil pipe 10 is connected with the plug 11.

It should be noted that the wax removal pipe and rod string of the oil well provided by the embodiment of the utility model can clean the wax deposited in the oil well while extracting crude oil. Crude oil can enter the second oil pipe 8 from the oil jacket annulus through the gas anchor 9, and the sediment in the crude oil can be deposited in the third oil pipe 10, and the crude oil is drawn from the second oil pipe 8 into the oil well pump barrel 501 by the oil well pump 5, Then withdraw to the annular space. At the same time, the hot washing medium is injected into the first sucker rod 1 from the third end of the well washing tee 7 in the direction indicated by the arrow in FIG. 3 , and flows out to the annular space through the well washing valve 101 . The hot washing medium and crude oil are discharged from the annular space to the ground through the oil well pump 5 . In this way, it can be realized that while the wax deposition in the oil well is cleaned, the extraction of crude oil is not affected, and time is saved.

In addition, under normal circumstances, the first oil pipe 4, the second oil pipe 8 and the third oil pipe 10 need to use oil pipes with the same outer diameter, and the outer diameter of the oil pump barrel 501 and the outer diameter of the first oil pipe 4 can be the same or different. , the outer diameter of the oil well pump plunger usually needs to be not smaller than the outer diameter of the second oil sucker rod 3 and not larger than the outer diameter of the oil well pump barrel 501, and the outer diameter of the air anchor 9 needs to be no less than the second oil pipe 8 and the third oil pipe 10, the outer diameter of the plug 11 needs to be identical with the outer diameter of the third oil pipe.

For example, for the first oil pipe 4, the second oil pipe 8 and the third oil pipe 10, oil pipes with an outer diameter of 73 millimeters can be selected; 502 external diameter is the oil well pump of 44 millimeters; For air anchor 9, can select the air anchor that external diameter is 90 millimeters for use, for plug 11, can select the plug that external diameter is 73 millimeters for use. Of course, for the first oil pipe 4, the oil well pump 5, the second oil pipe 8, the third oil pipe 10, the air anchor 9 and the plug 11, other models can also be selected, and this embodiment of the utility model is not limited thereto.

In the embodiment of the utility model, when the wax removal pipe string is lowered into the casing of the oil well, the well flushing valve provided in the first sucker rod is located within the reference depth range, that is, the position where the wax deposition is located in the oil well. The depth range of the position, and then the hot washing medium whose temperature is within the reference temperature range is injected into the first sucker rod by pressure, so that the well washing valve is in an open state under this pressure. Then, the hot-washing medium can flow out from the first sucker rod to the annular space through the well-washing valve to clean all the wax deposits in the reference depth range in the oil well, and the hot-washing medium and the first tubing can be mixed by the well pump Crude oil in the annulus drains to the surface. In this way, the heat-washing medium is injected from the first sucker rod, the well-washing channel is established through the well-washing valve set in the first sucker rod, and discharged from the annular space of the sucker rod and the tubing, thus forming a positive circulation to the structure in the oil well Wax is used to clean the oil to prevent hot washing medium from flowing back into the formation, causing formation pollution, ensuring the crude oil production of the oil well, and solving the problem that the pressure of the injected hot washing medium affects the crude oil production of the oil well. In addition, the cleaning of the oil well can be completed with only a small amount of hot cleaning medium required through the above-mentioned well cleaning channel, which can save costs while simplifying the well cleaning process, shortening the time for cleaning the oil well for wax formation, and improving the well cleaning efficiency.

Next, the utility model takes the J45-91 well as an example to further describe the wax removing pipe and rod string of the oil well shown in Fig. 3 . It is known that the wax content in crude oil of J45-91 well is 13.67%, and the freezing point of crude oil in J45-91 well is 31°C, so it is necessary to carry out wax removal treatment on J45-91 well every 45 days.

J45-91 well uses the wax removal pipe and rod string provided by the utility model to process the wax deposition in the oil well. As shown in Figure 3, the wax removal pipe rod string includes the first sucker rod with an outer diameter of 36 mm 1. Adapter 2. The second sucker rod 3. The first oil pipe with an outer diameter of 73 mm 4. The oil well pump 5. The polished rod with an outer diameter of 28 mm. Two oil pipes 8, an air anchor 9 with an outer diameter of 90 mm, a third oil pipe 10 with an outer diameter of 73 mm and a plug 11 with an outer diameter of 73 mm; the first sucker rod 1 is a hollow sucker rod, and the second sucker rod The rod 3 is composed of two-stage solid sucker rods with an outer diameter of 22 mm and an outer diameter of 19 mm, and the oil pump 5 includes a pump barrel 501 with an outer diameter of 73 mm and a plunger 502 with an outer diameter of 44 mm .

Wherein, the lower end of the first sucker rod 1 is connected with the upper end of the second sucker rod 3 through the adapter 2, the first sucker rod 1, the adapter 2 and the second sucker rod 3 are located in the first oil pipe 4, and An annular space is formed with the first oil pipe 4, the lower end of the second sucker rod 3 is connected to the plunger 502 of the oil pump, the lower end of the first oil pipe 4 is connected to the upper end of the pump barrel 501 of the oil pump, and the first sucker rod 1 is set inside Well flushing valve 101 is arranged. The upper end of the polished rod 6 is connected with the pumping unit on the ground, the first sucker rod 1 is connected with the polished rod 6 through the first end and the second end of the well cleaning tee 7, and the first end and the second end of the well cleaning tee 7 ends lie on a straight line. The lower end of the oil pump barrel 501 is connected to the upper end of the second oil pipe 8 , the lower end of the second oil pipe 8 is connected to the upper end of the air anchor 9 , and the lower end of the air anchor 9 is connected to the plug 11 through the third oil pipe 10 .

When the wax removal pipe string is lowered into the casing of the J45-91 well to clean the wax deposition in the J45-91 well, heat is injected into the first sucker rod through the third end of the well cleaning tee 7. Flushing medium, the well flushing valve 101 is in an open state under the pressure of the hot flushing medium injected, at this time, the hot flushing medium flows out from the well flushing valve 101 to clean the wax deposits in the oil well, and the oil well pump 5 sends the hot flushing medium and the first oil pipe The crude oil in 4 is discharged from the annular space to the ground together.

When using the wax removal pipe and rod string in the prior art to clean the wax deposition in J45-91 well, it needs to use 35 cubic meters of hot washing medium, which takes 4 hours to complete, and after the cleaning is completed, J45-91 It took several days for the well to return to normal production. And when using the wax removal pipe and rod column of the oil well provided by the utility model to clean up the wax deposition in the J45-91 well, it only needs 2 hours for each cleaning, and only 5 cubic meters of hot washing medium is needed for each cleaning, and the cleaning It only takes 6 hours after completion, and the J45-91 well can resume normal production. Compared with the wax removal pipes and rods provided by the prior art, the wax removal pipes and rods of the oil wells provided by the utility model will not contact the formation when cleaning the wax deposition in the J45-91 well, so as to prevent the formation from being polluted and save cleaning time. time, save the amount of hot washing medium, and can quickly restore normal production, ensuring the crude oil production of J45-91 well.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (7)

1. A wax removal pipe and rod string of an oil well, characterized in that, the wax removal pipe and rod string comprises: a first sucker rod (1), a conversion joint (2), a second sucker rod (3), a second sucker rod An oil pipe (4) and an oil pump (5), the first oil sucker rod (1) is a hollow oil sucker rod, and the oil well pump (5) includes an oil well pump barrel (501) and an oil well pump plunger (502 ); The lower end of the first sucker rod (1) is connected to the upper end of the second sucker rod (3) through the adapter (2), and the first sucker rod (1), the adapter (2) and the second sucker rod (3) are located in the first oil pipe (4), and form an annular space with the first oil pipe (4); The lower end of the second oil sucker rod (3) is connected to the oil well pump plunger (502), the lower end of the first oil pipe (4) is connected to the upper end of the oil well pump barrel (501), and the A well flushing valve (101) is arranged in the first sucker rod (1), and the well flushing valve (101) is used to be opened under the pressure of the hot washing medium injected into the first sucker rod (1) state, the hot washing medium flows out from the well washing valve (101) to clean the wax deposits in the oil well, and the oil well pump (5) is used to discharge the hot washing medium from the annular space to ground. 2. The wax removal pipe and rod string according to claim 1, characterized in that, the wax removal pipe and rod string also includes a polished rod (6) and a well-flushing tee (7), and the upper end of the polished rod (6) is connected to The pumping unit on the ground is connected, the lower end of the polished rod (6) is connected with the first end of the well cleaning tee (7), and the second end of the well cleaning tee (7) is connected with the first The upper end of the sucker rod (1) is connected, the third end of the well cleaning tee (7) is used to inject the hot washing medium, and the first end and the second end of the well cleaning tee (7) are located at on a straight line. 3. The wax removal pipe and rod string as claimed in claim 1 or 2, characterized in that, the wax removal pipe rod string also comprises a second oil pipe (8), an air anchor (9), a third oil pipe (10) and Plug (11); The lower end of the oil pump barrel (501) is connected to the upper end of the second oil pipe (8), the lower end of the second oil pipe (8) is connected to the upper end of the air anchor (9), and the air anchor The lower end of (9) is connected with the upper end of the third oil pipe (10), and the lower end of the third oil pipe (10) is connected with the plug (11). 4. The wax removal pipe and rod string according to claim 1, characterized in that, the second sucker rod (3) is a solid sucker rod. 5. The wax removal pipe and rod string according to claim 1, characterized in that, the well flushing valve (101) is a single flow valve. 6. The wax removal pipe and rod column according to claim 1, wherein the hot washing medium refers to a medium whose temperature is within a reference temperature range, and the lower limit of the reference temperature range is higher than the waxing point of crude oil. 7. The wax removal pipe and rod string according to claim 1, characterized in that, the well flushing valve (101) is located within a reference depth range, and the reference depth range refers to the depth of the wax deposited in the oil well. The depth range at the location.