CN118187747B - Nanogel underground injection device and method thereof - Google Patents

Abstract

The invention discloses a nanogel underground injection device and a method thereof, which belong to the technical field of oil well sealing or packing, wherein the injection device comprises a cylinder body which can be abutted with equipment in an oil pipe, the top of the cylinder body is provided with a unidirectional glue feeding structure, a stirring mechanism is arranged in the cylinder body, the periphery of the cylinder body is in sealing fit with the inner wall of the oil pipe, and the bottom of the cylinder body is provided with a glue leakage bottom plate; the injection method comprises the following steps: the cylinder body is placed in an oil pipe and connected with equipment, the nanogel injected into the oil pipe enters the cylinder body through a unidirectional glue inlet structure, and the nanogel is uniformly scattered by using a stirring mechanism, so that the precipitation phenomenon is avoided; finally, discharging through a glue leakage bottom plate at the bottom of the cylinder; after the nano gel stops injecting, the bottom hole flowing pressure is higher than the wellhead pressure, the nano gel cannot return under the action of the unidirectional glue inlet structure, and the bottom hole flowing pressure can automatically return the cylinder body out of the oil pipe. The invention adopts the nano gel to solve the defect of the conventional temporary plugging agent at present, and simultaneously can avoid that nano particles in the nano gel are separated from the gel to reduce the temporary plugging performance of the nano gel.

Description

Nanogel underground injection device and method thereof

Technical Field

The invention belongs to the technical field of oil well sealing or packing, and particularly relates to a nanogel underground injection device and a nanogel underground injection method.

Background

During drilling, when the pressure of the drilling fluid is higher than the formation pressure, some or all of the drilling fluid may infiltrate the high permeable layer, thereby causing loss of the drilling fluid and a decrease in formation productivity. With the extension of oil well production time, formation pressure in some areas is kept at a relatively low level under the influence of factors such as reservoir physical properties and an injection and production displacement system. Under the condition, when operations such as sand washing, acidification, repeated transformation and the like of an oil well are carried out, the problem of leakage of the well repairing liquid is particularly remarkable, and even the phenomenon of 'suck-back' can occur. Because of a large amount of lost well repairing liquid, the dosage of the well repairing liquid is increased, the construction cycle is difficult to establish, the construction period is prolonged, meanwhile, the reservoir is polluted, and the productivity recovery period is prolonged. To address these issues, temporary plugging agents are widely used which isolate highly permeable subterranean zones from drilling, completion and workover fluids.

Temporary plugging agents are key materials in petroleum engineering and are used to control the leakage of working fluid into formations during drilling, completion and workover to prevent loss of formation fluid and loss of subsurface formation productivity. Temporary plugging agents are generally classified into degradable plugging agents, cement temporary plugging agents, gel temporary plugging agents and the like. The degradable plugging agent is mainly made of natural materials and is environment-friendly, but the existing model only usually considers the influence of pore throat diameter when calculating the particle size distribution, and does not consider other important parameters such as complex pore throat structure of stratum. Cement temporary plugging agents are commonly used in the near field perforating operations, but they have problems such as failure due to mixing with drilling fluids, reduced mechanical strength due to reaction with subterranean chemicals, etc. The gel temporary plugging agent has high viscosity and short profile control radius.

Disclosure of Invention

In order to solve the problems, the invention provides the nanogel underground injection device and the nanogel underground injection method, the nanogel is relatively stable, the nanogel can be applied to deep profile control, and the nanogel can realize larger profile control radius and can adapt to a complex pore throat structure of a stratum.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

The utility model provides a nanogel is injection device in pit, includes the barrel that can with the interior equipment butt of oil pipe, the top of barrel is equipped with the one-way structure of advancing that can introduce nanogel, barrel all around with oil pipe inner wall sealing fit, be equipped with rabbling mechanism in the barrel for evenly break up the nanogel of leading-in; the bottom of the cylinder body is provided with a glue leakage bottom plate.

Preferably, the top of barrel is equipped with leak protection eaves and has the top cap of step, leak protection eaves sets up in the bottom of top cap, leak protection eaves's excircle and oil pipe inner wall are tight fit, can avoid the nanogel to get into the clearance between barrel lateral wall and the oil pipe.

Preferably, the unidirectional glue inlet structure comprises a glue inlet hole and a single-flow valve, wherein the glue inlet hole is obliquely arranged in the top cover of the cylinder body, the single-flow valve is arranged below the outlet at the lower end of the glue inlet hole, and the periphery of the single-flow valve is in sealing fit with the top cover; the nano gel enters the cylinder body through the gel inlet hole and the check valve.

Preferably, the check valve comprises a disc-shaped main body part, an annular groove for accommodating the main body part is formed in the bottom of the top cover, and an outlet at the lower end of the glue inlet hole is formed in the bottom wall of the annular groove; the top surface of main part is equipped with the collecting tank, the bottom of collecting tank is equipped with the weeping mouth, the below of weeping mouth is equipped with the spacer, the spacer passes through the elastic rod and links to each other with the lower extreme of main part, the spacer can be under the elasticity effect shutoff weeping mouth of elastic rod.

Preferably, the stirring mechanism comprises a central rod and a homogenizer, the homogenizer is sleeved on the central rod, the upper end of the central rod is connected with the top cover of the cylinder body, and the lower end of the central rod is connected with the glue leakage bottom plate; the nanogel entering the cylinder is uniformly mixed by a homogenizer.

Preferably, the upper end of the center rod is provided with an end cover, the periphery of the end cover is connected with the top cover through bolts, the top of the top cover is provided with a plugging cap, the middle part of the plugging cap is provided with a counter bore for accommodating the upper end of the center rod, and the periphery of the plugging cap is connected with the top cover through bolts.

Preferably, the homogenizer comprises a rotary column and a stirring sheet, wherein the rotary column is a hollow pipe body capable of accommodating a central rod, and a baffle capable of blocking and limiting the upper end of the rotary column is arranged on the central rod below the end cover; the stirring sheet is spirally arranged on the rotary column from top to bottom; the bottom of the lower end of the stirring piece is tangent to the glue leakage bottom plate.

Preferably, the glue leakage bottom plate comprises a bottom plate and a plurality of glue leakage holes, the periphery of the bottom plate is connected with the lower end of the cylinder in a sealing way, a mounting hole matched with the central rod is formed in the middle of the bottom plate, an outer circular ring of the bottom plate is a solid part, and the plurality of glue leakage holes are radially arranged between the mounting hole and the solid part in a divergent mode.

Preferably, the components of the nanogel comprise the following components in parts by weight:

0.5wt% polyacrylamide: 10 parts;

0.05wt% of chromium acetate: 1 part;

0.25wt% nano silica: 5 parts.

The invention also provides a method for measuring the wetting angle of the rough surface, which adopts the nanogel downhole injection device to inject nanogel into an oil pipe and comprises the following steps:

Assembling a cylinder;

the cylinder is put into an oil pipe, and the cylinder is not lowered any more when being abutted with equipment in the oil pipe;

Injecting nano gel into the oil pipe at the wellhead, enabling the nano gel to flow into the top of the cylinder body, and enabling the nano gel to enter the cylinder body along a unidirectional glue inlet structure;

After entering the cylinder, the nano gel is stirred and dispersed under the action of a stirring mechanism, and finally flows out of the oil pipe through a glue leakage bottom plate at the bottom of the cylinder;

After the nano gel is stopped being injected, the high pressure at the wellhead disappears, the bottom hole flowing pressure is higher than the wellhead pressure, the nano gel cannot return through the unidirectional glue inlet structure, and the bottom hole flowing pressure can push the cylinder out of the wellhead.

The beneficial effects of adopting above-mentioned technical scheme to produce lie in: compared with the prior art, the nano gel enters the oil pipe through the unidirectional glue inlet structure of the cylinder and enters the cylinder by putting the cylinder into the oil pipe and connecting the cylinder with equipment, and the nano gel can be uniformly scattered by utilizing the stirring mechanism, so that the precipitation phenomenon is avoided; finally, the glue is discharged through a glue leakage bottom plate at the bottom of the cylinder; after the nano gel stops injecting, the bottom hole flow pressure is higher than the wellhead pressure, the nano gel cannot return under the action of the unidirectional glue inlet structure, and the cylinder body can be automatically discharged out of the oil pipe in a returning mode under the action of the bottom hole flow pressure. The invention adopts the nano gel to solve the defect of the conventional temporary plugging agent at present, and simultaneously can avoid the phenomenon that nano particles are separated from the gel to reduce the temporary plugging performance of the nano gel in the nano gel injection process.

Drawings

The invention will be described in further detail with reference to the drawings and the detailed description.

FIG. 1 is a schematic diagram of the matching relationship between a nanogel downhole injection device and an oil pipe according to an embodiment of the invention;

FIG. 2 is a schematic view of a barrel according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a cartridge in an embodiment of the invention;

FIG. 4 is a schematic diagram of a homogenizer in an embodiment of the present invention;

FIG. 5 is a schematic diagram of a single flow valve in an embodiment of the invention;

FIG. 6 is a cross-sectional view of a single flow valve in an embodiment of the invention;

FIG. 7 is a schematic view of the structure of a center pole in an embodiment of the invention;

FIG. 8 is a schematic view of a bushing in an embodiment of the invention;

FIG. 9 is a schematic view of the structure of a plugging cap according to an embodiment of the present invention;

in the figure: 1-an oil pipe; 2-bolts; 3-uniflow valve, 30-main body, 31-spacer, 32-elastic rod, 33-liquid collecting tank, 34-liquid leakage port and 35-central rod connecting hole; 4-cylinder, 40-top cover, 41-bolt hole, 42-rod hole, 43-glue inlet hole, 44-leak-proof eave and 45-screw hole; 5-homogenizer, 51-stirring blade, 52-rotating column, 53-central hole; 6-glue leakage bottom plates, 60-chassis, 61-mounting holes and 62-glue leakage holes; 7-annulus, 8-water distributor, 9-plugging cap, 91-counter bore, 92-connecting hole, 10-center rod, 101-end cover and 102-baffle.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, the nanogel downhole injection device provided by the invention comprises a cylinder 4 capable of being abutted against equipment in an oil pipe 1, wherein a unidirectional glue inlet structure capable of introducing nanogel is arranged at the top of the cylinder 4, the periphery of the cylinder 4 is in sealing fit with the inner wall of the oil pipe 1, and a stirring mechanism is arranged in the cylinder 4 and is used for uniformly scattering the introduced nanogel; the bottom of the cylinder body 4 is provided with a glue leakage bottom plate 6. In this embodiment, the apparatus in the tubing 1 is a water distributor 8. The nano gel can only enter the cylinder body from top to bottom through the unidirectional glue inlet structure, and the nano particles and the gel can be uniformly mixed by utilizing the stirring mechanism, so that the precipitation phenomenon is avoided. After the nano gel stops being injected, the cylinder body can be automatically discharged back out of the wellhead under the action of the unidirectional gel feeding structure and the bottom hole flowing pressure because the bottom hole flowing pressure is higher than the wellhead pressure. The invention can adapt to the complex pore throat structure of stratum, is applied to isolating high permeability layer, and further solves the defect that nano particles are separated from gel in the process of injecting nano gel to reduce the temporary plugging performance of the nano gel.

In the embodiment of the present invention, as shown in fig. 2 and 3, the top of the cylinder 4 is provided with a leakage preventing eave 44 and a top cover 40 with steps, the leakage preventing eave 44 is disposed at the bottom of the top cover 40, and the outer circle of the leakage preventing eave 44 is tightly matched with the inner wall of the oil pipe 1, so that the nanogel can be prevented from entering the gap between the side wall of the cylinder 4 and the oil pipe 1, and the untreated nanogel can be prevented from leaking into the oil pipe through the annular space between the cylinder and the oil pipe. The leak-proof eave has the same inner diameter with the oil pipe, an annular gap is arranged between the outer wall of the cylinder body and the oil pipe, and the cylinder body can be straightened by means of the leak-proof eave in the process of injecting the nanogel, so that the abrasion of the oil pipe is reduced.

As a preferable structure, as shown in fig. 5 and 6, the unidirectional glue feeding structure comprises a glue feeding hole 43 and a single flow valve 3, wherein the glue feeding hole 43 is obliquely arranged in the top cover 40 of the cylinder 4, the single flow valve 3 is arranged below the outlet of the lower end of the glue feeding hole 43, and the periphery of the single flow valve 3 is in sealing fit with the top cover 40; the nano gel enters the cylinder 4 through the gel inlet hole 43 and the check valve 3. Wherein the check valve 3 comprises a disc-shaped main body part 30, an annular groove for accommodating the main body part 30 is arranged at the bottom of the top cover 40, and the lower end outlet of the glue inlet 43 is arranged on the bottom wall of the annular groove; the top surface of the main body part 30 is provided with a liquid collecting tank 33 which is in a shape of a circular table, so that the nano gel entering the cylinder can be ensured to enter the inner cavity completely, and the residue is reduced; the bottom of the liquid collecting tank 33 is provided with a liquid leakage port 34, a spacer 31 is arranged below the liquid leakage port 34, the spacer 31 is connected with the lower end of the main body part 30 through an elastic rod 32, and the spacer 31 can seal the liquid leakage port 34 under the elastic action of the elastic rod 32. The middle part of the main body part is provided with a central rod connecting hole 35 for installing a central rod of the stirring mechanism. The uniflow valve adopting the structure only allows the nanogel to be injected into the oil well from the well mouth downwards, and does not allow the nanogel to flow out of the well mouth reversely. The specific working process is as follows:

During the process of injecting the nanogel, due to the high pressure of the wellhead, the elastic rod 32 connected with the spacer 31 deforms, so that the spacer 31 is separated from the liquid leakage port 34, and the nanogel enters the inner cavity of the cylinder 4 through the liquid leakage port 34. After the injection of the nanogel is stopped, the bottom-hole pressure is higher than the wellhead pressure, and the cylinder 4 can be returned to the wellhead under the bottom-hole pressure because the nanogel cannot return to the wellhead through the one-way valve 3.

As a preferable structure, as shown in fig. 4, the stirring mechanism comprises a central rod 10 and a homogenizer 5, wherein the homogenizer 5 is sleeved on the central rod 10, the upper end of the central rod 10 is connected with a top cover 40 of the cylinder 4, and the lower end of the central rod 10 is connected with a glue leakage bottom plate 6; the nanogel entering the cylinder 4 is uniformly mixed by a homogenizer 5. Wherein the homogenizer 5 comprises a rotating column 52 and a stirring sheet 51, the rotating column 52 is a hollow tube body capable of accommodating the central rod 10, and the rotating column 52 can freely rotate around the central rod 10; a baffle plate 102 capable of blocking and limiting the upper end of the rotary column 52 is arranged on the central rod 10 below the end cover 101 so as not to move up and down; the stirring plate 51 is spirally arranged on the rotary column 52 from top to bottom; the bottom of the lower end of the stirring piece 51 is tangent to the glue leakage bottom plate 6 and is used for sweeping up the sinking nano particles. When assembled, the central bore 53 of the spin column 52 extends through the central rod 10. During the flow of the nanogel into the homogenizer 5, the stirring blade 51 is impacted to rotate the spin column 52 about the central rod. The nano gel drives the homogenizer 5 to rotate, and the nano particles and the gel are fully mixed in an annulus 7 between the homogenizer 5 and the cylinder 4, so that the sedimentation of the nano particles is avoided.

As a preferable structure, as shown in fig. 7 and 9, an end cover 101 is arranged at the upper end of the central rod 10, the periphery of the end cover 101 is connected with a top cover 40 through a bolt 2, a blocking cap 9 is arranged at the top of the top cover 40, a counter bore 91 for accommodating the upper end of the central rod 10 is arranged in the middle of the blocking cap 9, a connecting hole 92 is arranged at the periphery of the blocking cap 9, a bolt hole 41 is correspondingly arranged at the periphery of the top cover 40, and a through bolt 2 is conveniently connected with the top cover 40; meanwhile, the middle part of the top cover 40 is provided with a rod hole 42 matched with the central rod 10, screw holes 45 are formed in the periphery of the rod hole 42, and the end cover 101 is conveniently fixed on the top cover 40 by using screws, so that the connection between the central rod and the cylinder body is realized. The upper end of the central rod 10 is fixed through the blocking cap 9, and the homogenizer 5 is limited by the central rod 10, so that the homogenizer 5 can freely rotate around the central rod 10 to prevent the eccentric wear.

As a preferred structure, as shown in fig. 8, the glue leakage bottom plate 6 includes a chassis 60 and a plurality of glue leakage holes 62, the periphery of the chassis 60 is hermetically connected with the lower end of the cylinder 4, a mounting hole 61 matched with the central rod 10 is provided in the middle of the chassis 60, the outer ring of the chassis 60 is a solid portion, and the plurality of glue leakage holes 62 are radially divergently arranged between the mounting hole 61 and the solid portion. The solid part of the chassis can bear settled nano particles (nano silicon dioxide), the nano particles can be swept up by a subsequent stirring piece and are mixed with gel again, and the mixed nano gel flows out from the gel leakage hole.

In a specific design, the components of the nanogel comprise the following components in parts by weight:

0.5wt% polyacrylamide: 10 parts;

0.05wt% of chromium acetate: 1 part;

0.25wt% nano silica: 5 parts.

The polyacrylamide is used as a lubricant, a suspending agent, a clay stabilizer, an oil displacement agent, a fluid loss agent and a thickening agent, and is widely applied to drilling, acidification, fracturing, water shutoff, well cementation, secondary oil recovery and tertiary oil recovery. Chromium acetate is used as a cross-linking agent, and is subjected to gel forming reaction with polyacrylamide, and then is mixed with nano silicon dioxide to form nano gel, so that the nano gel can realize a larger profile control radius and can adapt to a complex pore throat structure of a stratum; meanwhile, the oil-water flow rate ratio can be improved, and the recovery ratio is improved.

The invention also provides a method for measuring the wetting angle of the rough surface, which adopts the nanogel downhole injection device to inject nanogel into an oil pipe and comprises the following steps:

Assembling the plugging cap 9, the top cover 40, the central rod 10, the homogenizer 5 and the glue leakage bottom plate 6 with the cylinder 4 from top to bottom;

the cylinder 4 is put into the oil pipe 1, and the descent is stopped after the cylinder 4 is abutted with equipment (such as a water distributor 8 and the like) in the oil pipe 1;

Injecting nano gel into the oil pipe 1 at the wellhead, wherein the nano gel flows into the top of the cylinder 4 and is accumulated at the top of the cylinder, and the nano gel cannot flow downwards due to the blocking of the anti-leakage eave 44; after being accumulated to the position of being over the glue inlet 43, the glue enters the check valve 3 along the glue inlet 43.

After the nano gel enters the liquid collecting tank 33 of the check valve 3, the nano gel extrudes the spacer 31 connected with the elastic rod 32 to expose the liquid leakage port 34, the gel enters the lower annular space 7 through the check valve 3, and the stirring sheet 51 starts to rotate due to the impact of the nano gel, so that the homogenizer formally starts to work.

Most of the nano particles are uniformly distributed in the gel under the rotary stirring action of the stirring sheet 51, but still a small part of nano particles are sunk, and the nano particles sunk are swept up by the lowest blade of the stirring sheet 51 and are uniformly distributed in the gel again under the stirring action. The uniformly dispersed nano gel flows out of the oil pipe through the glue leakage holes 62 on the glue leakage bottom plate 6 and the equipment in the oil pipe 1.

After the injection of the nanogel is stopped, the wellhead high pressure disappears, the bottom hole stream pressure is higher than the wellhead pressure, the nanogel cannot return through the check valve 3, and the bottom hole stream pressure can push the cylinder 4 out of the wellhead.

In conclusion, the invention has the advantages of simple structure, convenient use and low energy consumption; the nano particles and the gel can be uniformly dispersed by using the stirring sheet in the pit, and a small amount of settled nano particles are swept back again to participate in mixing again, so that the temporary blocking performance of the nano gel is prevented from being reduced due to the fact that the nano particles are separated from the gel; the cylinder body can automatically return and discharge the oil pipe by means of the check valve after the nano gel injection is stopped. The invention uses the nanogel to solve the defect of the conventional temporary plugging agent at present, and uses the nanogel underground dispersion even injection device to further solve the defect that the nanogel temporary plugging performance is reduced due to the fact that the nanoparticles are separated from the gel in the process of injecting the nanogel.

In the foregoing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed above.

Claims (7)

1. The utility model provides a nanogel injection device in pit which characterized in that: the device comprises a cylinder body which can be abutted against equipment in an oil pipe, wherein a unidirectional gel inlet structure capable of introducing nano gel is arranged at the top of the cylinder body, the periphery of the cylinder body is in sealing fit with the inner wall of the oil pipe, and a stirring mechanism is arranged in the cylinder body and used for uniformly scattering the introduced nano gel; the bottom of the cylinder body is provided with a glue leakage bottom plate;

The top of the cylinder is provided with an anti-leakage eave and a top cover with steps, the anti-leakage eave is arranged at the bottom of the top cover, and the outer circle of the anti-leakage eave is tightly matched with the inner wall of the oil pipe, so that the nanogel can be prevented from entering a gap between the side wall of the cylinder and the oil pipe;

the unidirectional glue inlet structure comprises a glue inlet hole and a single flow valve, wherein the glue inlet hole is obliquely arranged in a top cover of the cylinder body, the single flow valve is arranged below an outlet at the lower end of the glue inlet hole, and the periphery of the single flow valve is in sealing fit with the top cover; the nano gel enters the cylinder body through the gel inlet hole and the check valve;

The check valve comprises a disc-shaped main body part, an annular groove for accommodating the main body part is formed in the bottom of the top cover, and an outlet at the lower end of the glue inlet hole is formed in the bottom wall of the annular groove; the top surface of main part is equipped with the collecting tank, the bottom of collecting tank is equipped with the weeping mouth, the below of weeping mouth is equipped with the spacer, the spacer passes through the elastic rod and links to each other with the lower extreme of main part, the spacer can be under the elasticity effect shutoff weeping mouth of elastic rod.

2. The nanogel downhole injection device of claim 1, wherein: the stirring mechanism comprises a central rod and a homogenizer, the homogenizer is sleeved on the central rod, the upper end of the central rod is connected with the top cover of the cylinder body, and the lower end of the central rod is connected with the glue leakage bottom plate; the nanogel entering the cylinder is uniformly mixed by a homogenizer.

3. The nanogel downhole injection device of claim 2, wherein: the upper end of the center rod is provided with an end cover, the periphery of the end cover is connected with the top cover through bolts, the top of the top cover is provided with a plugging cap, the middle part of the plugging cap is provided with a counter bore for accommodating the upper end of the center rod, and the periphery of the plugging cap is connected with the top cover through bolts.

4. A nanogel downhole injection device according to claim 3, wherein: the homogenizer comprises a rotary column and stirring blades, wherein the rotary column is a hollow pipe body capable of accommodating a central rod, and a baffle capable of blocking and limiting the upper end of the rotary column is arranged on the central rod below the end cover; the stirring sheet is spirally arranged on the rotary column from top to bottom; the bottom of the lower end of the stirring piece is tangent to the glue leakage bottom plate.

5. The nanogel downhole injection device of claim 1, wherein: the glue leakage bottom plate comprises a bottom plate and a plurality of glue leakage holes, the periphery of the bottom plate is connected with the lower end of the cylinder in a sealing mode, a mounting hole matched with the central rod is formed in the middle of the bottom plate, an outer circular ring of the bottom plate is a solid portion, and the plurality of glue leakage holes are radially arranged between the mounting hole and the solid portion in a divergent mode.

6. The nanogel downhole injection device of claim 1, wherein: the nano gel comprises the following components in parts by weight:

0.5wt% polyacrylamide: 10 parts;

0.05wt% of chromium acetate: 1 part;

0.25wt% nano silica: 5 parts.

7. A nanogel underground injection method is characterized in that: injecting nanogel into an oil pipe using the nanogel downhole injection device according to any one of claims 1-6, comprising the steps of:

Assembling a cylinder;

the cylinder is put into an oil pipe, and the cylinder is not lowered any more when being abutted with equipment in the oil pipe;

Injecting nano gel into the oil pipe at the wellhead, enabling the nano gel to flow into the top of the cylinder body, and enabling the nano gel to enter the cylinder body along a unidirectional glue inlet structure;

After entering the cylinder, the nano gel is stirred and dispersed under the action of a stirring mechanism, and finally flows out of the oil pipe through a glue leakage bottom plate at the bottom of the cylinder;

After the nano gel is stopped being injected, the high pressure at the wellhead disappears, the bottom hole flowing pressure is higher than the wellhead pressure, the nano gel cannot return through the unidirectional glue inlet structure, and the bottom hole flowing pressure can push the cylinder out of the wellhead.