CN117231161A - Drilling tool for underground malignant plugging and underground packing plugging process - Google Patents

Abstract

The invention discloses a drilling tool for underground malignant plugging, which comprises a drilling rod, wherein a dead plugging guide shoe, a hole punching pipe, a packer and a releasing tool are arranged on the drilling rod, a ball seat capable of sliding is arranged in the drilling rod, the packer comprises a packer main body, an annular opening groove is formed in the outer peripheral surface of the packer main body, an air bag is arranged in the annular opening groove, a silica gel ring is arranged on the air bag, an adhesive accommodating capsule is arranged on the silica gel ring, quick-drying adhesive is arranged in the adhesive accommodating capsule, a wireless inflator pump is connected on the air bag, the wireless inflator pump can inflate the air bag, so that the outer peripheral surface of the silica gel ring can be attached to the inner wall of a well, and the quick-drying adhesive can be filled into a gap between the silica gel ring and the inner wall of the well. In addition, the invention also discloses a downhole packing and plugging process. The drilling tool for underground malignant plugging is simple in structure, convenient to operate and good in using effect.

Description

Drilling tool for underground malignant plugging and underground packing plugging process

Technical Field

The invention relates to a well drilling malignant plugging device, in particular to a drilling tool for downhole malignant plugging. In addition, the invention also relates to a downhole packing and plugging process.

Background

In oil and gas exploitation operation, lost circulation is an engineering problem frequently encountered in the petroleum drilling operation process, and if the lost circulation problem cannot be timely solved, more complex accidents can be caused.

According to the different leakage degree, the leakage can be divided into slight leakage, serious leakage and malignant leakage, and aiming at the slight leakage and the serious leakage, the leakage blocking agent is generally input to the leakage part, so that the slight leakage and the serious leakage can be solved. However, for malignant leakage, because the leakage place is larger and there is well bottom fluid, the conventional leakage blocking mode of inputting the leakage blocking agent cannot keep the leakage blocking agent in a relatively static state at the leakage place, and the leakage blocking agent cannot be well stabilized at the leakage place to form a leakage blocking layer without being diluted by the well bottom fluid.

In view of this, it is necessary to design a drilling tool for downhole malignant plugging.

Disclosure of Invention

The invention provides a drilling tool for downhole malignant plugging, which can effectively utilize a packer to form an annular space between a drill rod and a well into a sealed annular space, so that a plugging agent can be kept in a relatively static state at a lost part until condensation, and has the advantages of simple structure, convenience in operation and good use effect.

The invention also provides a downhole packing and plugging process, which solves the malignant leakage by using a drilling tool for downhole malignant leakage plugging, can clean a releasing tool after plugging and has excellent plugging effect.

In order to solve the technical problems, the invention provides a drilling tool for downhole malignant plugging, which comprises a drilling rod, wherein a dead plugging guide shoe, a hole punching pipe, a packer and a releasing tool are sequentially arranged on the drilling rod from bottom to top, a ball seat capable of sliding is arranged in the drilling rod, the packer comprises a packer main body, an annular opening groove is formed in the outer peripheral surface of the packer main body, at least two mutually communicated air bags are arranged in the annular opening groove, the air bags located at the innermost layer are fixedly connected with the inner peripheral surface of the annular opening groove, a silica gel ring is arranged on the outer peripheral surface of the air bags located at the outermost layer, an adhesive containing capsule is arranged on the silica gel ring, quick-drying adhesive is arranged in the adhesive containing capsule, the air bags located at the innermost layer are connected with a wireless inflator pump, and the wireless inflator pump can inflate into the air bags so that the outer peripheral surface of the silica gel ring is attached to the inner wall of a well, and the adhesive containing capsule can be broken after being stressed or water, so that the adhesive containing capsule can be filled into a gap between the silica gel ring and the inner wall of the well when encountering with water.

Preferably, a liquid storage cavity is arranged on the outer peripheral surface of the silica gel ring, and the adhesive containing capsule is arranged in the liquid storage cavity.

Preferably, the liquid storage cavity comprises a main cavity and a storage cavity communicated with the main cavity, the storage cavity is formed into a semicircular shape or a fan shape, and the adhesive containing capsule is placed against the side walls of the main cavity and the storage cavity so as to be capable of having a sufficient extension length after the air bag is inflated.

Specifically, in the initial state, the outer peripheral surface of the silica gel ring is level with the outer peripheral surface of the packer body or lower than the outer peripheral surface of the packer body.

Preferably, the number of the wireless air pumps is more than two, and an air duct is arranged between each wireless air pump and the air bag.

Preferably, each of the wireless inflator and the control system are formed as a wireless connection.

Preferably, the perforated pipe is formed into a cylindrical barrel body, and a plurality of one-way through holes are formed in the perforated pipe so as to enable plugging agent to enter an annulus between the drill rod and the drilling well from the one-way through holes.

Particularly preferably, the packer body is sleeved on a packer base, the upper end face of the packer base abuts against the lower end face of the first sleeve ring, at least two locking rings are arranged on the outer peripheral face of the first sleeve ring, and the locking rings located at the lower part abut against the upper end face of the packer body.

More preferably, the packer and the release tool are formed as a threaded or a snap-fit connection.

The invention also provides a downhole packing and plugging process, which comprises the following steps:

s1, the drill rod is lowered to the bottom of the well.

S2, inputting a plugging agent into the drill rod, wherein the plugging agent enters an annulus between the drill rod and the well through the perforated pipe.

S3, starting the wireless inflator pump, wherein the outer peripheral surface of the silica gel ring is abutted against the inner wall of the well, so that a space between the outer peripheral surface of the drill rod below the packer and the well is formed into a sealed annular space, and the plugging agent is positioned in the sealed annular space until solidification.

S4, placing the ball seat, wherein the ball seat is attached to the upper end edge of the packer, and plugging the central through hole of the packer main body.

S5, separating the releasing tool from the packer, and inputting well flushing liquid from the annular space between the outer peripheral surface of the releasing tool and the well drilling, wherein the well flushing liquid can be discharged from the upper end of the central through hole of the releasing tool so as to clean the releasing tool.

Through the technical scheme, the drilling tool for downhole malignant plugging comprises a drilling rod, a dead plugging guide shoe, a hole punching pipe, a packer and a releasing tool are sequentially arranged on the drilling rod from bottom to top, a ball seat capable of sliding is arranged in the drilling rod, the packer comprises a packer main body, an annular opening groove is formed in the outer peripheral surface of the packer main body, at least two mutually communicated air bags are arranged in the annular opening groove, the air bags located at the innermost layer are fixedly connected with the inner peripheral surface of the annular opening groove, a silica gel ring is arranged on the outer peripheral surface of the air bag located at the outermost layer, an adhesive containing capsule is arranged on the silica gel ring, quick-drying adhesive is arranged in the adhesive containing capsule, the air bag located at the innermost layer is connected with a wireless inflating pump, and the wireless inflating pump can inflate the air bag so that the outer peripheral surface of the silica gel ring is attached to the inner wall of a well, and the adhesive containing capsule can be broken after being stressed or water, so that the quick-drying adhesive in the adhesive containing capsule can fill the gap between the silica gel ring and the inner wall of the well. According to the drilling tool for underground malignant plugging disclosed by the invention, the packer is originally arranged on the drill rod, the wireless inflator pump on the packer is utilized to inflate the plurality of air bags, so that the silica gel ring is abutted against the inner wall of a well, a space between the outside of the drill rod below the packer and the well is formed into a sealed annular space, the plugging agent can not flow in the sealed annular space and is not easy to dilute by well bottom fluid, a good coagulation effect is formed, and thus the leaking part can be effectively plugged. After the leaking part is plugged, the central through hole below the packer on the drill rod can be plugged through the ball seat, meanwhile, the packer is combined, an annulus above the packer in drilling is formed into an open annulus with a sealed lower part, well washing liquid is input into the well washing device, the releasing tool is cleaned, the releasing tool is conveniently used normally again in the later stage, the cleaning process is simplified, the working efficiency is improved, and the using effect is excellent.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 is one of the schematic structural views of a drilling tool for downhole malignant plugging according to an embodiment of the present invention, showing a state diagram when the packer is not inflated;

FIG. 2 is a second schematic diagram of a drilling tool for downhole malignant plugging according to an embodiment of the present invention, showing a state diagram of the packer after inflation;

FIG. 3 is a third schematic diagram of a drilling tool for downhole malignant plugging according to an embodiment of the present invention, showing the cleaning of the release tool;

FIG. 4 is a schematic illustration of the structure of a packer according to an embodiment of the invention;

FIG. 5 is a schematic view of the structure of a silicone ring and adhesive containing capsule according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a liquid storage cavity on a silica gel ring according to an embodiment of the present invention.

Reference numerals illustrate:

1 dead blocking guide shoe 2 perforating tube

3 ball seat 4 packer

401 packer body 402 annular open slot

403 air bag 404 silica gel ring

405 wireless inflator 406 liquid storage cavity

4061 Main Chamber 4062 storage Chamber

407 adhesive holds 5 release tools of capsule

6 drilling rod 7 packer base

8 first collar 9 locking ring

10 malignant leakage

Detailed Description

The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings, it being understood that the embodiments described herein are for purposes of illustration and explanation only, and the scope of the invention is not limited to the following embodiments.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted in advance that the terms of orientation, such as "bottom", "top", "upper", "lower", etc., referred to in the description of the various embodiments below are all distinguished by technical meaning in terms of the vertical orientation in which the hydrocarbon production well is normally disposed.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1, 2 and 4, the drilling tool for downhole malignant plugging according to the basic embodiment of the present invention comprises a drill rod 6, wherein a dead plugging guide shoe 1, a perforated pipe 2, a packer 4 and a releasing tool 5 are sequentially arranged on the drill rod 6 from bottom to top, a ball seat 3 capable of sliding is arranged in the drill rod 6,

the packer 4 comprises a packer main body 401, an annular opening groove 402 is formed in the outer peripheral surface of the packer main body 401, at least two mutually communicated air bags 403 are arranged in the annular opening groove 402, the air bags 403 located at the innermost layer are fixedly connected with the inner peripheral surface of the annular opening groove 402, a silica gel ring 404 is arranged on the outer peripheral surface of the air bags 403 located at the outermost layer, an adhesive containing capsule 407 is arranged on the silica gel ring 404, quick-drying adhesive is arranged in the adhesive containing capsule 407, the air bags 403 located at the innermost layer are connected with a wireless inflator pump 405, the wireless inflator pump 405 can inflate the air bags 403, so that the outer peripheral surface of the silica gel ring 404 can be attached to the inner wall of a well, and the quick-drying adhesive in the adhesive containing capsule 407 can be broken after being stressed or in water, so that the quick-drying adhesive in the adhesive containing capsule 407 is filled into a gap between the silica gel ring 404 and the inner wall of the well.

The drilling tool for downhole malignant plugging comprises the drill rod 6, wherein the drill rod 6 can be formed into a structure that drill rods with different lengths are connected, so that the perforated pipe 2, the packer 4 and the releasing tool 5 are arranged on the drill rod 6, and the perforated pipe 2, the packer 4 and the releasing tool 5 are arranged between the two drill rods. The packer 4 is connected with one section of drill rod, the packer 4 comprises a packer main body 401, an annular open groove 402 is formed in the packer main body 401, a plurality of air bags 403 are arranged in the annular open groove 402, each air bag 403 is arranged around the annular open groove 402, the inner peripheral surface of the air bag 403 positioned at the innermost layer is fixedly connected with the outer peripheral surface of the bottom surface of the annular open groove 402, and two adjacent air bags 403 are also fixedly connected and mutually communicated. When inflated by the wireless inflator 405 into the innermost bladder 403, each bladder 403 is able to slowly expand. In order to avoid the situation that the air bag 403 is punctured by touching hard objects (such as stones and wood heads) on the inner wall of the well when being abutted against the inner wall of the well, the invention fixedly connects the silica gel ring 404 on the outer peripheral surface of the air bag 403 on the outermost layer, and the silica gel ring 404 is formed by silica gel, so when the air bag 403 is gradually expanded outwards, the diameter of the silica gel ring 404 is gradually increased along with the air bag 403 due to the ductility of the silica gel ring until the silica gel ring is abutted against the inner wall of the well. After the silica gel ring 404 is attached to the inner wall of the well, the annular space between the drill rod 6 and the well is formed into a relatively sealed space, the plugging agent can relatively rest at the lower part of the sealed annular space, the sealed annular space can also prevent external fluid from entering the sealed annular space, the flushing and dilution of the plugging agent by the fluid can be avoided, and the solidification speed of the plugging agent is accelerated.

In some embodiments, in order to avoid a gap between the silica gel ring 404 and the inner wall of the well, so that the sealing effect of the sealed annulus is poor, the invention further provides an adhesive containing capsule 407 on the silica gel ring 404, and a quick-drying adhesive is arranged in the adhesive containing capsule 407. The adhesive containing capsule 407 may be damaged passively, for example, by being extruded and damaged after encountering a hard object, or an operator may actively break the adhesive containing capsule 407 according to the actual operation condition, so as to fill the quick-drying adhesive in a small amount of gaps between the silica gel ring 404 and the inner wall of the well.

As a preferred embodiment of the present invention, as shown in fig. 5, a liquid storage cavity 406 is provided on the outer peripheral surface of the silicone ring 404, and the adhesive containing capsule 407 is disposed in the liquid storage cavity 406.

More preferably, as shown in fig. 6, the liquid storage chamber 406 includes a main chamber 4061 and a reserve chamber 4062 communicating with the main chamber, the reserve chamber 4062 is formed in a semicircular shape or a fan shape, and the adhesive containing capsule 407 is placed against the side walls of the main chamber 4061 and the reserve chamber 4062 so as to be capable of having a sufficient extension length after the airbag 403 is inflated.

In some embodiments, the adhesive containing capsules 407 also have a certain amount of expansion due to the silicone ring 404 that expands during use. Specifically, the liquid storage cavity 406 surrounds the silica gel ring 404 and is arranged, and the liquid storage cavity 406 comprises a main cavity 4061 and a storage cavity 4062, wherein the main cavity 4061 is a linear storage channel, the storage cavity 4062 is a drop-shaped storage channel, a drop-shaped storage channel is connected between two adjacent linear storage channels, when the diameter of the silica gel ring 404 is gradually increased, the adhesive containing capsules 407 arranged in the drop-shaped storage channels are gradually straightened, and because of enough expansion and contraction amount, the adhesive containing capsules 407 cannot be damaged in the stretching process.

As another preferred embodiment of the present invention, in the initial state, the outer circumferential surface of the silica gel ring 404 is level with the outer circumferential surface of the packer body 401 or lower than the outer circumferential surface of the packer body 401.

In another preferred embodiment of the present invention, the number of the wireless inflators 405 is two or more, and a vent pipe is provided between each of the wireless inflators 405 and the airbag 403.

In some embodiments, the number of the wireless air pumps 405 is multiple, the wireless air pumps 405 are uniformly arranged on the outer peripheral surface of the silica gel ring 404, the wireless air pumps 405 are in wireless connection with the control system, the silica gel ring 404 can be further provided with a plurality of lithium batteries, the lithium batteries are electrically connected with the wireless air pumps 405, the control system can simultaneously control the plurality of wireless air pumps 405 to be inflated into the air bags 403 through the air pipes communicated with the wireless air pumps, and therefore the operation efficiency is improved.

As a specific structural form of the invention, the perforated pipe 2 is formed into a cylindrical barrel body, and the perforated pipe 2 is provided with a plurality of unidirectional through holes so as to enable plugging agent to enter an annulus between the drill pipe 6 and the well.

In some embodiments, the specific structure of the unidirectional through holes is as follows, a plurality of through holes are arranged around the perforated pipe 2, a wafer is arranged on the outer peripheral surface of the perforated pipe 2 corresponding to the through holes, and the wafer is fixedly connected on the outer peripheral surface of the perforated pipe 2 through a unidirectional hinge. The plugging agent in the perforated pipe 2 enters the annular space outside the perforated pipe 2 under the action of certain pressure, and can not enter the perforated pipe 2 through the perforated pipe 2 due to the combined action of the disc and the unidirectional hinge, and the plugging agent stays in the sealing ring more stably under the sealing action of the packer 4.

As another specific structural form of the present invention, the packer body 401 is sleeved on the packer base 7, the upper end surface of the packer base 7 abuts against the lower end surface of the first sleeve ring 8, at least two locking rings 9 are arranged on the outer peripheral surface of the first sleeve ring 8, and the locking rings 9 located at the lower part abut against the upper end surface of the packer body 401.

As yet another specific construction of the invention, the packer 4 and the release tool 5 are formed as a threaded connection or a snap connection.

The underground packing and plugging process of the basic embodiment of the invention comprises the following steps:

s1, the drill rod 6 is lowered to the bottom of the well.

S2, inputting a plugging agent into the drill rod 6, wherein the plugging agent enters an annulus between the drill rod 6 and the well through the perforated pipe 2.

S3, starting the wireless inflator 405, wherein the outer peripheral surface of the silica gel ring 404 is abutted against the inner wall of the well, so that a space between the outer peripheral surface of the drill rod 6 below the packer 4 and the well is formed into a sealed annular space, and the plugging agent is positioned in the sealed annular space until solidification.

S4, the ball seat 3 is put in, the ball seat 3 is abutted against the upper end edge of the packer 4, and the central through hole of the packer main body 401 is plugged.

S5, separating the releasing tool 5 from the packer 4, and inputting well flushing liquid from the annular space between the outer peripheral surface of the releasing tool 5 and the well drilling, wherein the well flushing liquid can be discharged from the upper end of the central through hole of the releasing tool 5 so as to clean the releasing tool 5.

In some embodiments, the specific operation of the downhole pack-off plugging process of the present invention is as follows:

first, as shown in fig. 1, the drill pipe 6 is lowered to the bottom of the well. Then, plugging agent is input into the central through hole of the drill rod 6, and enters the annular space outside the drill rod 6 through the perforated pipe 2. Next, as shown in fig. 2, the activation control system turns on the wireless inflator 405 to inflate the bladder 403 until the outer circumference of the silicone ring 404 abuts the inner wall of the well. If the inner wall of the well is uneven, the adhesive containing capsule 407 may be damaged due to stress, or a worker may add a dissolving agent (such as water) according to actual operation requirements to damage the adhesive containing capsule 407, so that quick-drying adhesive in the adhesive containing capsule 407 overflows, and a small amount of gap between the silica gel ring 404 and the well is blocked, so that the sealing effect of the sealed annulus is better. Finally, as shown in fig. 3, after the plugging agent is condensed, after the malignant leakage 10 is eliminated, the plugging agent is put into the ball seat 3, after the packer 4 is separated from the releasing tool 5, the ball seat 3 is used for plugging the upper port of the packer 4, the ball seat 3 and the packer 4 form a semi-closed structure on the upper area of the well, which is positioned on the packer 4, and the well washing liquid input from the upper opening of the well can enter from the lower opening of the releasing tool 5, so as to clean the releasing tool 5.

As can be seen from the above description of the present invention, the drilling tool for downhole malignant plugging of the present invention is originally provided with an annular opening groove 402 on a packer main body 401, a plurality of mutually communicated air bags 403 are arranged in the annular opening groove 402, and a control system capable of being remotely controlled is connected with a wireless inflator 405 to control the opening of the wireless inflator 405 and charge air into the air bags 403. The bladder 403, during the gradual inflation process, holds the silicone ring 404 against the wall of the borehole. And, when the wall of the well of well drilling is uneven, still have a small amount of clearances between silica gel circle 404 and the wall of the well drilling, can hold capsule 407 atress damage or manual control through the gluing agent and make its damaged quick-witted gluing agent that releases in the gluing agent holds capsule 407, fill to the silica gel circle 404 and the wall of the well drilling in a small amount of clearances, improve the sealed annular space seal effect for the plugging agent that is located the lower part of sealed annular space can not flow or not erode by fluid, thereby make the plugging agent can solidify rapidly, reach the better result of use of carrying out the leak repairing to malignant leakage 10. More original is, after malignant leakage 10 eliminates, through preventing ball seat 3 to the upper end opening part of packer 4, upper portion region of packer 4 in the well drilling is sealed the bottom, input well cleaning solution, enter into the inner chamber of releasing tool 5 with the well cleaning solution from releasing tool 5's lower extreme opening, it is clear that the upper half that utilizes current well drilling washs releasing tool 5, can not need design other washings tool again, further simplified the work flow, work efficiency has been improved, manufacturing cost has been reduced, the diversified utilization to the drilling space has been realized. After all cleaning is completed, the ball seat 3 can be knocked down to the bottom of the drilling tool by striking the ball seat 3, and the drilling tool can be used normally.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.

In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.

Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims (10)

1. The drilling tool for underground malignant plugging is characterized by comprising a drilling rod (6), wherein a dead plugging guide shoe (1), a perforating pipe (2), a packer (4) and a releasing tool (5) are sequentially arranged on the drilling rod (6) from bottom to top, a ball seat (3) capable of sliding is arranged in the drilling rod (6),

the packer (4) comprises a packer main body (401), an annular opening groove (402) is formed in the outer peripheral surface of the packer main body (401), at least two layers of mutually communicated air bags (403) are arranged in the annular opening groove (402), the innermost air bags (403) are fixedly connected with the inner peripheral surface of the annular opening groove (402), a silica gel ring (404) is arranged on the outer peripheral surface of the outermost air bags (403), an adhesive containing capsule (407) is arranged on the outer periphery of the silica gel ring (404), quick-drying adhesive is arranged in the adhesive containing capsule (407), a wireless air pump (405) is connected to the innermost air bags (403), the wireless air pump (405) can be used for inflating the inside of the adhesive containing air bags (403), so that the outer peripheral surface of the silica gel ring (404) is attached to the inner wall of a well, and the adhesive containing capsule (407) can be broken after being stressed or water, so that the adhesive containing capsule (407) is filled into the gap between the adhesive containing capsule (407) and the inner wall of the well.

2. The drilling tool for downhole malignant plugging according to claim 1, wherein a liquid storage cavity (406) is provided on the outer circumferential surface of the silicone ring (404), and the adhesive containing capsule (407) is placed in the liquid storage cavity (406).

3. The drilling tool for downhole malignant plugging according to claim 2, wherein the reservoir (406) comprises a main chamber (4061) and a reserve chamber (4062) in communication with the main chamber, the reserve chamber (4062) being formed in a semicircular or fan shape, the adhesive containing capsule (407) being placed against the side walls of the main chamber (4061) and the reserve chamber (4062) to enable the adhesive containing capsule (407) to have a sufficient extension length after inflation of the balloon (403).

4. The drilling tool for downhole malignant plugging according to claim 1, wherein in an initial state the outer circumference of the silicone ring (404) is level with the outer circumference of the packer body (401) or lower than the outer circumference of the packer body (401).

5. The drilling tool for downhole malignant plugging according to claim 1, wherein the number of wireless inflators (405) is more than two, and a vent pipe is provided between each wireless inflator (405) and the balloon (403).

6. The drilling tool for downhole malignant plugging according to claim 5, wherein each of the wireless inflators (405) is formed in wireless connection with a control system.

7. Drilling tool for downhole malignant plugging according to any of claims 1-6, wherein the perforated tube (2) is formed as a cylindrical barrel, the perforated tube (2) being provided with a number of unidirectional through holes for enabling plugging agent to enter the annulus between the drill rod (6) and the well from the unidirectional through holes.

8. A drilling tool for downhole malignant plugging according to any of claims 1-6, wherein the packer body (401) is sleeved on a packer foundation (7), an upper end surface of the packer foundation (7) is abutted against a lower end surface of a first collar (8), at least two locking rings (9) are provided on an outer circumferential surface of the first collar (8), and the locking rings (9) located at the lower part are abutted against the upper end surface of the packer body (401).

9. Drilling tool for downhole malignant plugging according to any of claims 1-6, wherein the packer (4) and the release tool (5) are formed as a threaded connection or a snap-on connection.

10. The underground packing plugging process is characterized by comprising the following steps of:

s1, the drill rod (6) is lowered to the bottom of the well.

S2, inputting a plugging agent into the drill rod (6), wherein the plugging agent enters an annulus between the drill rod (6) and the well through the perforated pipe (2).

S3, starting the wireless inflator pump (405), wherein the outer peripheral surface of the silica gel ring (404) is abutted against the inner wall of the well, so that a space between the outer peripheral surface of the drill rod (6) below the packer (4) and the well is formed into a sealed annular space, and the plugging agent is positioned in the sealed annular space until solidification.

S4, the ball seat (3) is put in, the ball seat (3) is abutted against the upper end edge of the packer (4), and the central through hole of the packer main body (401) is plugged.

S5, separating the releasing tool (5) from the packer (4), and inputting well flushing liquid from the annular space between the outer peripheral surface of the releasing tool (5) and the well drilling, wherein the well flushing liquid can be discharged from the upper end of the central through hole of the releasing tool (5) so as to clean the releasing tool (5).