CN113073946B - Using method of riser device with protective pipe - Google Patents
Using method of riser device with protective pipe Download PDFInfo
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- CN113073946B CN113073946B CN202010400235.5A CN202010400235A CN113073946B CN 113073946 B CN113073946 B CN 113073946B CN 202010400235 A CN202010400235 A CN 202010400235A CN 113073946 B CN113073946 B CN 113073946B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
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- 239000004677 Nylon Substances 0.000 claims description 3
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- 229920001778 nylon Polymers 0.000 claims description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1085—Wear protectors; Blast joints; Hard facing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Marine Sciences & Fisheries (AREA)
- Earth Drilling (AREA)
Abstract
A method of using a riser assembly, comprising: the device comprises a pipe body, a protective pipe sleeved outside the pipe body, a female joint arranged below the pipe body, a feeding male joint and a tieback male joint; wherein, the tube body is provided with a wedge block; a pipe protecting cap is covered on the upper end surface of the pipe protecting; and a fishing lug for feeding and tieback is sleeved in the protective pipe cap; an anti-rotation inserting block is inserted between the female connector and the feeding male connector; the female joint and the tieback male joint are locked together by a locking ring; the anti-rotation insertion block is internally provided with a wedging angle for preventing the anti-rotation insertion block from moving upwards, and the upper end of the wedging angle is connected with a steel wire rope. The invention has considered two kinds of modes of abandoning the well and changing into the development well permanently, when it does not change into the development well, it does not need to move the drilling ship to abandon; when the exploratory well is converted into a development well, the exploratory well can be subjected to wellhead tie-back for smooth development, so that the processing scheme of the exploratory well meets the permanent abandoning standard; not only greatly reduces the oil-gas exploration and development cost, but also realizes the oil-gas field rolling exploration and development.
Description
Technical Field
The invention belongs to the field of marine oil and gas engineering, and particularly relates to a using method of a riser device with a protective pipe.
Background
In the initial stage of exploration and development of offshore oil and gas fields, a large amount of exploration drilling needs to be completed in order to evaluate the value of oil reservoirs.
After the exploration evaluation operation at the present stage is finished, two abandoning modes, namely a temporary abandoning mode and a permanent abandoning mode, are generally adopted. Wherein, the temporary well abandoning mode is as follows: temporarily stopping offshore operation for returning to the well to continue a series of well sealing and safety disposal operations; the temporary well abandoning mode has the advantages of well mouth reservation and convenient subsequent conversion into a production well, but according to the requirements of laws and regulations, related procedures need to be handled and regular inspection and maintenance are needed, if a block does not have the overall development value, secondary abandoning operation needs to be carried out, and therefore high operation cost is easily generated; the permanent well abandoning mode is as follows: the operation of offshore exploratory wells, development wells and other wells is abandoned permanently. Because of the need to remove the wellhead after a permanent well abandonment operation, it cannot restore the wellbore connection, i.e. it cannot be converted into a production well for use.
The method aims to find a reentry permanent well abandoning technology, and combines the permanent well abandoning with the well opening turning so that the processing scheme of the exploration well abandoning meets the permanent well abandoning standard (if the exploration well is not turned into a development well, a drilling ship is not required to be mobilized for abandoning, and if the exploration well is turned into the development well, the well mouth can be connected back for smooth development, thereby reducing the exploration and development cost of oil and gas fields and realizing the rolling exploration and development of the oil and gas fields). Therefore, it is urgently needed to design a riser device with a protection pipe, which not only can meet the national relevant legal requirements, but also can reduce the abandoning cost of an exploration well.
Disclosure of Invention
The invention aims to provide a using method of a riser device with a protective pipe, which aims to solve the technical problem of permanent well abandoning and well opening turning.
In order to achieve the purpose, the specific technical scheme of the riser pipe device with the protective pipe is as follows:
a method of using a riser package, the riser package comprising: the device comprises a pipe body, a protective pipe sleeved outside the pipe body, a female joint arranged below the pipe body, a feeding male joint and a tieback male joint; wherein, the tube body is provided with a wedge block; a pipe protecting cap is covered on the upper end surface of the pipe protecting; and a fishing lug for feeding and tieback is sleeved in the protective pipe cap; an anti-rotation inserting block is inserted between the female connector and the feeding male connector; the female joint and the tieback male joint are locked together by a locking ring; the anti-rotation insertion block is internally provided with a wedging angle for preventing the anti-rotation insertion block from moving upwards, and the upper end of the wedging angle is connected with a steel wire rope.
Furthermore, the protective pipe is of a cylindrical structure, and the upper end of the protective pipe is in a bell mouth shape; and the upper end of the bell mouth is positioned at the mud surface; the protective tube is made of glass fiber reinforced plastics; the protective tube is fixed in a threaded hole of the female joint by a bolt.
Further, an O-shaped ring groove is formed in the lower end of the feeding male connector, and an O-shaped ring is arranged in the O-shaped ring groove; a plurality of trapezoidal teeth are arranged on the periphery of the feeding male connector.
Furthermore, a dismounting threaded hole is formed in the female joint; the female joint below the pipe body is provided with a welding seam; and the upper end surface of the female joint is covered with a female joint cap; a salvaging column is sleeved on the female joint cap; the salvaging column is used for feeding and tieing back a female joint cap, and a ventilation hole is arranged at the center of a vertical column body of the salvaging column, so that the air pressure inside and outside the female joint is consistent through the ventilation hole.
Furthermore, a boss protruding out of the vertical column body is further arranged on the side face of the fishing column; the fishing column is vertically sleeved at the center of the female joint cap.
Further, the locking ring is a C-shaped ring with one open end, and the material of the locking ring is 65Mn.
Furthermore, the shape of the tube protection cap is inverted T, and the middle part of the tube protection cap is provided with a through hole; the protective tube cap covers the bell mouth of the protective tube; the material of the protective pipe cap is glass fiber reinforced plastic.
Furthermore, the fishing lug is an inverted T-shaped structure matched with the protection tube cap and is inserted into the through hole of the protection tube cap; the side face of the fishing lug on the vertical column body is also provided with a boss protruding from the vertical column body, and the fishing lug is made of nylon.
Further, the wedge angle preferably has a slope value of: 30-60 degrees.
The method specifically comprises the following steps:
the first step is as follows: cutting the guide pipe to be close to the male buckle end and installing a female joint, and installing a feeding male joint and a wedge block to be close to the female buckle end;
the second step is that: in the drilling stage, a guide hole is drilled and reamed, then a pipe body is put in, and when the pipe body is put in a proper depth, the pipe body is connected with a guide pipe provided with a female joint;
the third step: connecting the female connector and the feeding male connector, and inserting the anti-rotation insert block between the female connector and the feeding male connector, so that the anti-rotation insert block is in contact with the wedge block, and a wedging angle is formed to prevent the anti-rotation insert block from moving upwards;
the fourth step: fixing the protective pipe on the female joint; the steel wire rope is connected to the pin shaft and used for pulling the anti-rotation insertion block out of the female joint and the feeding male joint so that the female joint and the feeding male joint can be separated through rotation;
the fifth step: the riser device with the protective pipe in the feeding state is put into the drilled well and well cementation is carried out;
and a sixth step: in the abandoning stage, a pneumatic winch is used for pulling the steel wire rope on the drill floor, the anti-rotation insertion block slips off from the conical surface at the lower end of the wedge block and is pulled out from between the female joint and the feeding male joint, then the anti-rotation insertion block is rotated and is fed into the male joint, and the pipe body is lifted to the drill floor;
the seventh step: hanging a female joint cap seat on the upper end surface of the female joint, and meanwhile, enabling the distance from the upper end surface of the female joint cap to a mud surface to be more than 4m so as to meet the requirements of SY/T6045-2011 of ocean abandoned well operation specifications;
eighth step: installing a protective pipe cap on the upper end face of the protective pipe to prevent external marine organisms, silt, fishes and other impurities from entering the protective pipe;
the ninth step: the method has the advantages that the method can complete well abandoning operation, meet the permanent well abandoning standard, meet the requirements of the ocean well abandoning operation specification SY/T6045-2011, and is easy to transfer to a development well in the later period;
the tenth step: in the tie-back stage of the development well, the protective pipe cap is taken out firstly, and then the female joint cap is taken out; and then, connecting the pipe body and the tieback male joint into a whole by the drill floor, installing the locking ring at the corresponding position of the tieback male joint, pressing the pipe body for 5-10T after the pipe body is put in place, and at the moment, expanding and locking the locking ring by the elasticity of the locking ring, so that the connection of the female joint and the tieback male joint is realized, the recovery of a shaft is completed, and the well is successfully converted into a development well.
The use method of the riser device with the protective pipe has the following advantages:
1. the invention has the technical scheme of both permanent abandonment and development, so that the processing scheme of the exploratory well meets the permanent abandonment standard (if the exploratory well is not converted into the development well, a drilling ship is not required to be mobilized for abandonment, and if the exploratory well is converted into the development well, the well mouth can be connected back to smoothly develop); therefore, the oil-gas exploration and development cost is greatly reduced, and the oil-gas field rolling exploration and development is realized;
2. the invention not only meets the national relevant legal requirements, but also can reduce the abandoning cost of the exploratory well;
3. the invention has strong universality and wide adaptability.
Drawings
FIG. 1 is a schematic structural view of a feeding state of the present invention;
FIG. 2 is a schematic view of a portion A of FIG. 1;
FIG. 3 is a structural diagram of the tie-back state of the present invention;
FIG. 4 is a partial enlarged view of the tie-back position B of the present invention;
FIG. 5 is a schematic view of the disposal state of the present invention.
The notation in the figure is:
1. the pipe comprises a pipe body, 2 parts of a protective pipe, 3 parts of a welding line, 4 parts of trapezoidal teeth, 5 parts of threaded holes, 6.O-shaped rings, 7 parts of female connectors, 8 parts of feeding male connectors, 9 parts of dismounting threaded holes, 10 parts of anti-rotation inserting blocks, 11 parts of wedge tight angles, 12 parts of pin shafts, 13 parts of wedge blocks, 14 parts of steel wire ropes, 15 parts of locking rings and 16 parts of tieback male connectors; 17. fishing ear, 18, pipe protecting cap, 19, ventilation hole, 20, fishing column, 21, female joint cap.
Detailed Description
For better understanding of the purpose, structure and function of the present invention, the following will describe in further detail the method of using the riser device with a protection pipe according to the present invention with reference to the accompanying drawings.
As shown in fig. 1 to 5, the riser pipe apparatus with a protector of the present invention includes: the pipe comprises a pipe body 1, a protective pipe 2 which is sleeved outside the pipe body 1 in a matching mode, a female joint 7 which is arranged below the pipe body 1 in a welding mode, a feeding male joint 8 and a tieback male joint 16; wherein, the tube body 1 is provided with a wedge block 13 by welding; the upper end surface of the protective tube 2 is covered with a protective tube cap 18; and a fishing lug 17 for feeding and tieback is sleeved in the protective pipe cap 18 in a close fit manner; an anti-rotation inserting block 10 is inserted between the female connector 7 and the feeding male connector 8; the female connector 7 and the tieback male connector 16 are locked together by a locking ring 15; the anti-rotation insert 10 is provided therein with a wedge angle 11 for preventing the anti-rotation insert 10 from moving upward, and the upper end of the wedge angle 11 is connected to a wire rope 14 through a pin 12.
As shown in fig. 1, 2 and 3, the protection tube 2 is of a cylindrical structure, and the upper end of the protection tube 2 is in a bell mouth shape; and the upper end of the bell mouth is positioned at the mud surface; the protective tube 2 is made of glass fiber reinforced plastics; the protective tube 2 is fixed to the threaded hole 5 of the female joint 7 by a bolt.
As shown in fig. 2, the lower end of the feeding male connector 8 is provided with an O-ring groove in which an O-ring 6 is arranged; a plurality of trapezoidal teeth 4 are arranged on the periphery of the feeding male connector 8;
as shown in fig. 5, the female joint 7 is provided with a dismounting threaded hole 9; the female joint 7 under the pipe body 1 is provided with a welding seam 3; and the upper end surface of the female joint 7 is covered with a female joint cap 21; the fishing column 20 is matched and sleeved on the female joint cap 21, and the fishing column 20 is used for feeding and connecting the female joint cap 21 back.
A ventilation hole 19 is arranged in the center of the vertical column body of the fishing column 20, and the ventilation hole 19 enables the internal and external air pressures of the female joint 7 to be consistent; the side surface of the fishing column 20 is also provided with a boss protruding out of the vertical column body; and the fishing rod 20 is vertically sleeved at the central position of the female joint cap 21.
The lock ring 15 is a C-shaped ring with an open end, and the material of the lock ring 15 is 65Mn.
As shown in fig. 5, the protecting tube cap 18 is in the shape of an inverted T, and a through hole is formed in the middle; and the protective tube cap 18 is covered on the bell mouth of the protective tube 2; the material of the protective tube cap 18 is glass fiber reinforced plastic;
the fishing lug 17 is an inverted T-shaped structure matched with the protection tube cap 18 and is inserted into a through hole of the protection tube cap 18, a boss protruding out of the upright column body is further arranged on the side face of the upright column body of the fishing lug 17, and the fishing lug 17 is made of nylon.
The wire 14 extends up to the drill floor.
The inclination of the wedge angle 11 is: 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °; preferably: 30-60 degrees.
The invention specifically adopts the following steps:
as shown in figure 1 of the drawings, in which,
the first step is as follows: according to the model of the 30' riser pipe required by the operation, namely: cutting the guide pipe 1, installing a female joint 7 at the end, close to the male buckle, of the guide pipe 1 in a welding mode, installing a male joint 8 at the end, close to the female buckle, in a welding mode, and installing a wedge block 13 in a welding mode;
the second step is that: in the drilling stage, a guide hole 26 is drilled, the hole is expanded to 30', then the pipe body 1 is lowered, and when the pipe body is lowered to a proper depth, the pipe 1 provided with the female joint 7 is connected;
the third step: the female connector 7 and the feeding male connector 8 are connected through the trapezoidal teeth 4, the anti-rotation insert 10 is inserted between the female connector 7 and the feeding male connector 8, the anti-rotation insert 10 is in contact with the wedge 13, and a wedge tight angle 11 is formed to prevent the anti-rotation insert 10 from moving upwards, and the anti-rotation insert 10 is used for preventing the feeding male connector 8 and the feeding male connector 7 from rotating circumferentially;
the fourth step: fixing the protective pipe 2 on the female joint 7 by using a bolt; the steel wire rope 14 is connected to the pin shaft 12 and used for pulling the anti-rotation insert 10 out of the female connector 7 and the feeding male connector 8, so that the anti-rotation insert can be separated after 1/8 of rotation between the female connector 7 and the feeding male connector 8;
the fifth step: lowering the riser device in run-in condition into the drilled 30 "borehole (as shown in figure 1) and cementing;
and a sixth step: in the abandoning stage, a pneumatic winch is used for pulling a steel wire rope 14 on a drill floor, the anti-rotation insertion block 10 slips from the conical surface at the lower end of the wedge block 13 and is pulled out from between the female joint 7 and the feeding male joint 8, then the feeding male joint is rotated for 81/8 circles, and the pipe body 1 is lifted to the drill floor;
the seventh step: as shown in fig. 5, a female joint cap feeding tool is used for hanging a female joint cap 21 on the upper end surface of a female joint 7, meanwhile, the distance from the upper end surface of the female joint cap 21 to a mud surface is more than 4m, so that the requirement of SY/T6045-2011 of ocean abandoned well operation specifications is met, and metal cannot exist 4m below a mud line;
eighth step: the protective pipe cap 18 is arranged on the upper end surface of the protective pipe 2 by using a protective pipe cap feeding tool, so that impurities such as external marine organisms, silt, fishes and the like can be prevented from entering the protective pipe 2, and a shaft can keep certain cleanliness and the reliability of tie-back;
the ninth step: the pipe protecting cap is recovered and sent into the tool, so that well abandoning operation is completed, the permanent well abandoning standard is met, the requirements of SY/T6045-2011 of ocean well abandoning operation specifications are met, and a development well is easy to transfer at the later stage;
the tenth step: after the well is abandoned, the well is developed, and in the tieback stage, the protective pipe cap 18 is taken out, and then the female joint cap 21 is taken out; the pipe body 1 and the tieback male connector 16 are connected into a whole by adopting a welding mode on a drill floor, the locking ring 15 is arranged at the corresponding position of the tieback male connector 16, the pipe body is pressed down for 5-10T after the pipe body is put in place, at the moment, the locking ring 15 is expanded by the elasticity of the locking ring, and is locked on the trapezoidal teeth 4, so that the connection of the female connector 7 and the tieback male connector 16 is realized, the recovery of a shaft is completed, and the shaft is successfully converted into a development well.
When the device is used, the device is arranged on the pipe body 1 of the drill floor, and when the device is not converted into a development well, a drilling ship does not need to be mobilized for abandonment; when the oil-gas field is converted into a development well, the well head can be connected back to smoothly develop the oil-gas field, so that the oil-gas exploration and development cost is reduced, and the oil-gas field rolling exploration and development are realized; therefore, the requirements of relevant national laws are met, and the exploratory well abandoning cost can be reduced.
The above-mentioned unexplained technologies are prior art and will not be described in detail.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (1)
1. A method of using a riser pipe apparatus, comprising: the device comprises a pipe body, a protective pipe sleeved outside the pipe body, a female joint arranged below the pipe body, a feeding male joint and a tieback male joint; wherein, the tube body is provided with a wedge block; a pipe protecting cap is covered on the upper end surface of the pipe protecting; and a fishing lug for feeding and tieback is sleeved in the protective pipe cap; an anti-rotation inserting block is inserted between the female connector and the feeding male connector; the female connector and the tieback male connector are locked together by the locking ring; a wedging angle for preventing the anti-rotation insertion block from moving upwards is arranged in the anti-rotation insertion block, and the upper end of the wedging angle is connected with a steel wire rope;
the protective pipe is of a cylindrical structure, and the upper end of the protective pipe is in a bell mouth shape; and the upper end of the bell mouth is positioned at the mud surface; the protective tube is made of glass fiber reinforced plastic; the protective pipe is fixed in a threaded hole of the female joint by using a bolt;
an O-shaped ring groove is formed in the lower end of the feeding male connector, and an O-shaped ring is arranged in the O-shaped ring groove; a plurality of trapezoidal teeth are arranged on the periphery of the feeding male connector;
a dismounting threaded hole is formed in the female joint; the female joint below the pipe body is provided with a welding seam; and the upper end surface of the female joint is covered with a female joint cap; a salvaging column is sleeved on the female joint cap; the salvaging column is used for feeding and tieback a female joint cap, and a ventilation hole is arranged in the center of a vertical column body of the salvaging column, so that the air pressure inside and outside the female joint is consistent;
the side surface of the salvaging column is also provided with a boss protruding out of the vertical column body; the salvaging column is vertically sleeved at the central position of the female joint cap;
the locking ring is a C-shaped ring with an opening at one end, and the locking ring is made of 65Mn;
the shape of the tube protecting cap is inverted T, and the middle part of the tube protecting cap is provided with a through hole; the protective tube cap covers the bell mouth of the protective tube; the material of the protective pipe cap is glass fiber reinforced plastic;
the fishing lugs are in inverted T-shaped structures matched with the protective pipe caps and are inserted into the through holes of the protective pipe caps; a boss protruding out of the vertical column body is further arranged on the side face of the vertical column body of the fishing lug, and the fishing lug is made of nylon;
the wedge angle preferably has a slope value of: 30-60 degrees; the marine riser device with the protective pipe specifically comprises the following steps:
the first step is as follows: cutting the guide pipe, installing a female joint close to the male buckle end, and installing a feeding male joint and a wedge block close to the female buckle end;
the second step is that: in the drilling stage, a guide hole is drilled and reamed, then a pipe body is put in, and when the pipe body is put in a proper depth, the pipe body is connected with a guide pipe provided with a female joint;
the third step: connecting the female joint and the feeding male joint, and inserting the anti-rotation insert block between the female joint and the feeding male joint so that the anti-rotation insert block is in contact with the wedge block and forms a wedging angle to prevent the anti-rotation insert block from moving upwards;
the fourth step: fixing the protective pipe on the female joint; the steel wire rope is connected to the pin shaft and used for pulling the anti-rotation insertion block out of the female joint and the feeding male joint so that the female joint and the feeding male joint can be separated through rotation;
the fifth step: the riser device with the protective pipe in the feeding state is put into the drilled well and well cementation is carried out;
and a sixth step: in the abandoning stage, a pneumatic winch is used for pulling the steel wire rope on the drill floor, the anti-rotation insertion block slips off from the conical surface at the lower end of the wedge block and is pulled out from between the female joint and the feeding male joint, then the anti-rotation insertion block is rotated and is fed into the male joint, and the pipe body is lifted to the drill floor;
the seventh step: hanging a female joint cap seat on the upper end surface of the female joint, and meanwhile, enabling the distance from the upper end surface of the female joint cap to a mud surface to be more than 4m so as to meet the requirements of SY/T6045-2011 of ocean abandoned well operation specifications;
eighth step: installing a protective pipe cap on the upper end face of the protective pipe to prevent external marine organisms, silt, fishes and other impurities from entering the protective pipe;
the ninth step: the operation of well abandonment is completed, the permanent well abandonment standard is met, the requirements of SY/T6045-2011 specification of marine well abandonment are met, and the well is easy to be developed in the later period;
the tenth step: in the tie-back stage of the development well, the protective pipe cap is taken out firstly, and then the female joint cap is taken out; and then, connecting the pipe body and the tieback male joint into a whole by the drill floor, installing the locking ring at the corresponding position of the tieback male joint, pressing the pipe body for 5-10T after the pipe body is put in place, and then, expanding and locking the locking ring by the elasticity of the locking ring, so that the connection of the female joint and the tieback male joint is realized, the recovery of a shaft is completed, and the well is successfully converted into a development well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010400235.5A CN113073946B (en) | 2020-05-13 | 2020-05-13 | Using method of riser device with protective pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010400235.5A CN113073946B (en) | 2020-05-13 | 2020-05-13 | Using method of riser device with protective pipe |
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| CN113073946B true CN113073946B (en) | 2022-12-06 |
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