CN112943109B

CN112943109B - Multifunctional integrated pipe column for gas injection, test and pressurized operation and use method

Info

Publication number: CN112943109B
Application number: CN202110034478.6A
Authority: CN
Inventors: 王在强; 薛建强; 赵广民; 任国富; 巨亚锋; 赵敏琦; 李成龙; 胡相君; 蒙鑫
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2023-06-30
Anticipated expiration: 2041-01-12
Also published as: CN112943109A

Abstract

The invention relates to the technical field of oil field enhanced recovery ratio, in particular to a multifunctional integrated tubular column for gas injection, test and pressurized operation and a use method thereof, wherein the airtight tubular column is sequentially connected with an airtight oil pipe, an airtight packer, a blanking plug working cylinder, a soluble core shearing ball seat and a bell mouth; the blanking plug working cylinder meets the requirement of pressurized operation, and effectively solves the technical problem of blowout prevention in the oil pipe during tripping; the soluble core shear ball seat not only can meet the setting requirement of a packer, but also can keep enough borehole drift diameter through the dissolution of the soluble core, thereby providing convenience for the running of a gas injection well suction profile testing tool; the soluble core and the soluble ball are made of soluble materials, and can realize complete dissolution under certain medium, temperature and pressure, thereby effectively preventing the generation of well bore junk.

Description

Multifunctional integrated pipe column for gas injection, test and pressurized operation and use method

Technical Field

The invention relates to the technical field of oil field enhanced oil recovery, in particular to a multifunctional integrated pipe column for gas injection, test and pressurized operation and a use method thereof.

Background

At present, the gas flooding field test at home and abroad adopts a general gas injection process. For reservoirs with uniform air suction sections, the general air injection can meet the effective displacement requirements of multiple sections of oil layers. Conventional general gas injection tubing strings expose a number of problems: the downhole packer is a key tool of a gas injection string, and has the main effects of sealing an oil separation sleeve annulus, preventing injected gas from channeling up the oil separation sleeve annulus, ensuring gas injection safety, simultaneously preventing the oil separation sleeve of the annulus from generating corrosion after the injected gas encounters moisture, and the currently used packer has the problems of insufficient sealing gas capacity, high casing pressure rising speed, short-time oil separation sleeve pressure balance and the like, and particularly has larger drilling tonnage of the packer, so that the situations of string disconnection, overhaul and the like are caused. Meanwhile, when the injection well needs to be operated, the formation pressure system can be damaged by the deflation operation, the cost is increased, the oil layer is polluted by the well killing operation, the gas well is generally operated under pressure, the requirement of the operation under pressure is not met by the pipe column function, and the blowout prevention in the oil pipe becomes a difficult problem when the well is started and tripped. In addition, the conventional gas injection pipe column only considers normal gas injection, and when the gas suction profile test is required in the later period, the pipe column drift diameter cannot meet the requirement of the test tool, so that the work cannot be implemented. In order to solve the problems, a new technical idea needs to be explored from the design of the pipe column, and a multifunctional integrated pipe column for gas injection, test and operation under pressure and a use method thereof are provided.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides a multifunctional integrated tubular column for gas injection, test and pressurized operation and a use method thereof, and particularly, the soluble core shearing ball seat can not only realize the setting requirement of a packer, but also realize the dissolution of the soluble core, and the well bore keeps a sufficient drift diameter so as to meet the passing requirement of a gas injection well gas suction profile test tool. The function of the gas injection pipe column is more perfect, and the requirement of the oilfield gas flooding test is further met.

The technical problems solved by the invention can be realized by adopting the following technical scheme:

the utility model provides a gas injection, test and multi-functional integrated tubular column of operation under pressure, includes airtight oil pipe, is used for first deblocking and then the packer of unblock, blanking plug working cylinder, ball seat and horn mouth, airtight oil pipe, packer, blanking plug working cylinder, ball seat and horn mouth connect gradually.

Further, the packer be airtight packer, airtight packer include upper junction, center tube, seat seal packing element, seat seal piston, lower clutch, interlock mechanism and deblocking mechanism, upper junction and lower clutch connect respectively at the both ends of center tube, seat seal packing element, seat seal piston and interlock mechanism all cup joint on the outer wall of center tube, and lie in between upper junction and the lower clutch, interlock mechanism one end is connected with the upper junction, the interlock mechanism other end contacts with seat seal packing element one end, seat seal packing element other end contacts with the one end of seat seal piston, deblocking mechanism one end is connected with the outer wall of seat seal piston, deblocking mechanism other end is connected with lower clutch, still be provided with the outer step of indent center tube on the both ends lateral wall of center tube respectively, seat seal piston chamber is provided with between seal tube and the center tube, has the hydraulic pressure entry with seat seal piston chamber intercommunication on the center tube.

Further, the interlock mechanism include adapter sleeve, last cone, slips cover, slips and lower cone, adapter sleeve one end is connected on the outer wall of upper joint, and adapter sleeve other end joint is on the outer wall of upper cone one end, and the tip of upper cone contacts with the tip of upper joint, upper cone, slips and lower cone cup joint respectively on the outer wall of center tube, the cone end of upper cone and lower cone sets up relatively, slips are located between upper cone and the lower cone.

Further, the engagement mechanism also comprises a release pin and a slip sleeve, one end of the connecting sleeve is connected to the outer wall of the upper joint through the release pin, the slip sleeves are respectively connected to the upper cone and the lower cone, and two ends of the slip are respectively positioned in the two slip sleeves.

Further, deblocking unclamping mechanism include lock sleeve, catch, holding ring and anticollision ring, the anticollision ring is fixed to be cup jointed on the lower joint, lock sleeve one end and the outer wall connection of setting piston, the lock sleeve other end and the outer wall connection of anticollision ring, catch and holding ring all are located between the inner wall of lock sleeve and the outer wall of lower joint, the one end of catch contacts with holding ring one end, holding ring is connected with the outer wall of lower joint.

Further, the deblocking and unclamping mechanism further comprises deblocking pins and starting shear pins, the other end of the lock sleeve is connected with the outer wall of the anti-collision ring through the starting shear pins, and the supporting ring is connected with the outer wall of the lower connector through the deblocking pins.

Further, the ball seat be soluble core shearing ball seat, soluble core shearing ball seat includes overcoat, sealing washer and soluble core, and the overcoat is tubular structure, and soluble core sets up in the overcoat, the overcoat includes an upper end and a lower extreme, sets up the sealing washer between the inner wall of overcoat in the upper end and the outer wall of soluble core, the tip of the soluble core that is located the upper end intracavity of overcoat is used for bearing soluble ball.

Further, the soluble core shear ball seat also comprises a shear pin, and the shear pin penetrates through the outer sleeve to be connected with the soluble core.

A method for gas injection, testing and pressurized operation of a multifunctional integrated tubular column comprises the following steps:

gas injection function:

the pipe column is lowered, a bell mouth at the lower end of the pipe column is positioned at an air injection layer, after the pipe column is lowered in place, a soluble ball is thrown into an airtight oil pipe to the upper end of a ball seat, a closed space is formed in the pipe column at the upper end of the ball seat to perform pressure holding, setting of an airtight packer is completed, the pressure is increased, a shearing pin is sheared, the soluble core and the soluble ball fall down to the bottom of an artificial well through the bell mouth, an air injection channel is opened, and normal air injection is implemented;

test function:

when the soluble core and the soluble ball fall into the artificial well bottom, the dissolution is realized, and the large drift diameter is realized in the pipe column;

when the air suction profile test is required to be carried out, the test tool sequentially passes through the airtight oil pipe, the airtight packer, the blanking plug working cylinder, the ball seat and the bell mouth, and test operation is carried out;

the operation function is pressed in area:

the blanking plug working cylinder is arranged on the pipe column, when the later operation with pressure is needed to start and trip, the blanking plug is put into the well mouth, the blanking plug is put into the position of the blanking plug working cylinder, the rubber cylinder of the blanking plug is set, the internal blowout prevention function of the oil pipe is completed, and the operation function with pressure of the pipe column is realized.

Further, the soluble core and the soluble ball are soluble materials, and the soluble materials can be completely dissolved under certain medium, temperature and pressure.

The beneficial effects of the invention are as follows:

compared with the prior art, the invention has the advantages that the operation and test functions under pressure are added on the premise of ensuring the normal gas injection of the pipe column, and the invention has important significance for improving the efficiency and saving the cost of the oilfield gas drive test.

The airtight packer realizes the first deblocking and then deblocking, avoids deblocking difficulties, and overcomes the conditions of pipe column disconnection, overhaul and the like; when the blanking plug working cylinder is used for tripping, the blanking plug is put into the blanking plug, the working cylinder is seated, the weighting rod is lowered, the working cylinder is sealed through the leather cup, the oil pipe is blocked under pressure, the requirement of the operation under pressure is met, and the technical problem of blowout prevention in the oil pipe during tripping is effectively solved; the soluble core shear ball seat not only can meet the setting requirement of a packer, but also can keep enough borehole drift diameter through the dissolution of the soluble core, thereby providing convenience for the running of a gas injection well suction profile testing tool; the soluble core and the soluble ball are made of soluble materials, and can realize complete dissolution under certain medium, temperature and pressure, thereby effectively preventing the generation of well bore junk.

Drawings

The invention will be further described with reference to the drawings and examples.

FIG. 1 is a schematic diagram of a multifunctional integrated pipe column for gas injection, test and pressurized operation according to the present invention.

FIG. 2 is a schematic diagram of the airtight seal packer of the present invention.

Fig. 3 is a schematic structural view of the soluble core shear ball seat of the present invention.

In the figure: 1-airtight oil pipe, 2-airtight packer, 3-blanking plug working cylinder, 4-ball seat, 5-bell mouth, 6-gas injection layer, 7-artificial bottom hole, 8-upper joint, 9-central pipe, 10-unclamping pin, 11-connecting sleeve, 12-upper cone, 13-slip sleeve, 14-slip, 15-lower cone, 16-setting rubber cylinder, 17-setting piston, 18-lock sleeve, 19-lower joint, 20-lock ring, 21-supporting ring, 22-unclamping pin, 23-starting shear pin, 24-crashproof ring, 25-central pipe outer step, 26-outer sleeve, 27-sealing ring, 28-shearing pin, 29-soluble core and 30-soluble ball.

Detailed Description

The scheme of the multifunctional integrated pipe column for gas injection, test and operation under pressure and the use method thereof provided by the embodiment of the invention are described in detail below through a plurality of specific embodiments.

Example 1:

referring to fig. 1, the multifunctional integrated pipe column for gas injection, test and pressurized operation comprises a gas-tight oil pipe 1, a packer for unsealing and then unclamping, a blanking plug working cylinder 3, a ball seat 4 and a bell mouth 5, wherein the gas-tight oil pipe 1, the packer, the blanking plug working cylinder 3, the ball seat 4 and the bell mouth 5 are sequentially connected.

In the above embodiment, after the airtight oil pipe 1, the airtight packer 2, the blanking plug working cylinder 3, the soluble core shearing ball seat 4 and the bell mouth 5 are sequentially connected, a lower tubular column is put into the lower tubular column, the bell mouth 5 at the lower end of the tubular column is positioned at the gas injection layer 6, after the tubular column is put in place, the soluble ball 30 is thrown into the airtight oil pipe 1 to the upper end of the ball seat 4, a closed space is formed in the tubular column at the upper end of the ball seat 4 to hold pressure, the setting of the airtight packer 2 is completed, the pressure is increased, the soluble ball 30 descends in the ball seat 4, falls into the artificial well bottom 7 through the bell mouth 5, a gas injection channel is opened, and normal gas injection is implemented.

When the dissolvable ball 30 falls into the artificial well bottom 7, dissolution is realized, and a large drift diameter is realized in the pipe column; when the air suction profile test needs to be carried out, the test tool sequentially passes through the airtight oil pipe 1, the packer, the blanking plug working cylinder 3, the ball seat 4 and the bell mouth 5 to carry out test operation.

The blanking plug working cylinder 3 is arranged on the pipe column, when the later operation with pressure is needed to start and trip, the blanking plug is put into the well head, the blanking plug is put into the position of the blanking plug working cylinder 3, the rubber cylinder of the blanking plug is set, the internal blowout prevention function of the oil pipe is completed, and the operation function with pressure of the pipe column is realized.

The airtight packer 2 in the embodiment can realize the deblocking and then deblocking, so that the deblocking difficulty is avoided. The arranged blanking plug working cylinder 3 meets the requirement of the tripping pipe column for the operation under pressure. The ball seat 4 can not only realize the setting requirement of a packer, but also realize the dissolution of the dissolvable ball 30, and the well bore maintains a sufficient drift diameter so as to meet the passing requirement of the gas injection well suction profile testing tool. The function of the gas injection pipe column is more perfect, and the requirement of the oilfield gas flooding test is further met.

Example 2:

referring to fig. 2, further, the packer is a gas seal packer 2, the gas seal packer 2 includes an upper joint 8, a central tube 9, a setting rubber tube 16, a setting piston 17, a lower joint 19, a snapping mechanism and a deblocking and unclamping mechanism, the upper joint 8 and the lower joint 19 are respectively connected at two ends of the central tube 9, the setting rubber tube 16, the setting piston 17 and the snapping mechanism are all sleeved on an outer wall of the central tube 9 and are located between the upper joint 8 and the lower joint 19, one end of the snapping mechanism is connected with the upper joint 8, the other end of the snapping mechanism is contacted with one end of the setting rubber tube 16, the other end of the setting rubber tube 16 is contacted with one end of the setting piston 17, one end of the deblocking and unclamping mechanism is connected with an outer wall of the setting piston 17, the other end of the deblocking and unclamping mechanism is connected with the lower joint 19, inner concave outer steps 25 of the central tube are respectively arranged on outer side walls of two ends of the central tube 9, a hydraulic inlet communicated with the seat piston cavity is arranged between the setting piston 17 and the central tube 9.

In the above embodiment, the upper joint 8 is used for being connected with the airtight oil pipe 1, the setting rubber 16 is used for sealing an inner annulus and an outer annulus in a shaft, the setting piston 17 is pushed by hydraulic pressure in the central pipe 9 to enter the setting piston cavity, the setting rubber 16 is extruded to seal the inner annulus and the outer annulus in the shaft, the engagement mechanism is used for engaging with the inner wall of the sleeve, the unlocking mechanism is used for unlocking the packer, when the lifting pipe column unlocking mechanism loses support, the setting rubber 16 is retracted to realize unlocking, the lifting pipe column is continuously lifted, the central pipe 9 is continuously lifted, and when the outer step 25 of the central pipe on the central pipe 9 is lifted to the position of the slips 14, the slips 14 are recovered to realize unlocking of the packer, and the unlocking action is completed. The packer is firstly unpacked and then unpacked from the prior art, and when unpacked, the packing element is in a setting state, so that the pressure generated by the annular liquid column of the oil sleeve greatly influences the tonnage of the unpacked, the mode of firstly unpacking and then unpacking is changed, the unpacking is firstly realized, the setting packing element 16 is retracted, the upper liquid is communicated with the lower liquid, the pipe column is not subjected to the pressure of the liquid column, the unpacking is facilitated, and the recovery rate of the packer is improved.

Example 2:

referring to fig. 2, further, the engagement mechanism includes a connecting sleeve 11, an upper cone 12, a slip sleeve 13, a slip 14 and a lower cone 15, one end of the connecting sleeve 11 is connected to the outer wall of the upper joint 8, the other end of the connecting sleeve 11 is clamped to the outer wall of one end of the upper cone 12, the end of the upper cone 12 contacts with the end of the upper joint 8, the upper cone 12, the slip 14 and the lower cone 15 are respectively sleeved on the outer wall of the central tube 9, the cone ends of the upper cone 12 and the lower cone 15 are oppositely arranged, and the slip 14 is located between the upper cone 12 and the lower cone 15.

Further, the engagement mechanism further comprises a release pin 10 and a slip sleeve 13, one end of a connecting sleeve 11 is connected to the outer wall of the upper joint 8 through the release pin 10, slip sleeves 13 are respectively connected to the upper cone 12 and the lower cone 15, and two ends of each slip 14 are respectively located in the two slip sleeves 13.

In the above embodiment, the packer is a hermetic packer 2, and the hermetic packer 2 is specifically: the wellhead lifting airtight oil pipe 1 and the upper joint 8 are removed, the upper joint 8 and the unlocking pin 10 on the connecting sleeve 11 are firstly broken, the upper joint 8 and the central pipe 9 are continuously lifted, and the unlocking and unlocking mechanism loses support due to the support of the anchoring force of the slips 14. Therefore, the setting rubber cylinder 16 is in an unsealing state, the unsealing action is completed, then the central pipe 9 continues to ascend, when the central pipe outer step 25 on the central pipe 9 ascends to the position of the slips 14, the slips 14 recover the packer to realize the unlocking, and the unlocking action is completed, so that the operations of unsealing and then unlocking are completed, and the gas sealing packer 2 is smoothly started.

The working principle of the airtight packer 2 is as follows:

the hydraulic pressure enters the setting piston cavity through a hydraulic inlet on the central pipe 9, the setting piston 17 is pushed to ascend to compress the setting rubber cylinder 16, the lower cone 15 is driven, the slips 14 are opened from the slip sleeve 13, and at the moment, the slips 14 are meshed with the inner wall of the sleeve; and simultaneously, the mechanism in the deblocking and unclamping mechanism is meshed, so that the packer is in a permanent setting state.

Example 3:

referring to fig. 2, further, the deblocking and unclamping mechanism includes a lock sleeve 18, a lock ring 20, a supporting ring 21 and an anti-collision ring 24, the anti-collision ring 24 is fixedly sleeved on the lower joint 19, one end of the lock sleeve 18 is connected with the outer wall of the setting piston 17, the other end of the lock sleeve 18 is connected with the outer wall of the anti-collision ring 24, the lock ring 20 and the supporting ring 21 are both located between the inner wall of the lock sleeve 18 and the outer wall of the lower joint 19, one end of the lock ring 20 is contacted with one end of the supporting ring 21, and the supporting ring 21 is connected with the outer wall of the lower joint 19.

Further, the deblocking and unclamping mechanism further comprises a deblocking pin 22 and a starting shear pin 23, the other end of the lock sleeve 18 is connected with the outer wall of the anti-collision ring 24 through the starting shear pin 23, and the supporting ring 21 is connected with the outer wall of the lower joint 19 through the deblocking pin 22.

The deblocking principle of the airtight packer 2 in the above embodiment is as follows:

the wellhead lifting airtight oil pipe 1 and the upper joint 8 are removed, the upper joint 8 and the unclamping pin 10 on the connecting sleeve 11 are firstly broken, the upper joint 8 and the central pipe 9 are continuously lifted, the unclamping pin 22 on the supporting ring 21 is sheared off due to the supporting of the anchoring force of the slips 14, the locking ring 20 and the locking sleeve 18 are out of support, the setting rubber 16 is retracted to be in an unclamped state, the central pipe 9 continues to ascend, and when the outer step 25 of the central pipe on the central pipe 9 ascends to the position of the slips 14, the slips 14 recover the packer to realize unclamping, the unclamping action is completed, and the packer is smoothly lifted out.

When the packer is set, hydraulic pressure enters the cavity of the setting piston through a hydraulic inlet on the central tube 9, the setting piston 17 is pushed to ascend to compress the setting rubber cylinder 16, and simultaneously, the shear pins 23 are started to shear during pushing, so that the locking sleeve 18 and the setting piston 17 together ascend to compress the setting rubber cylinder 16, when the slips 14 are meshed with the inner wall of the sleeve, the locking sleeve 18 is simultaneously meshed with the locking ring 20, after the central tube 9 is depressurized, the locking ring 20 is supported by the supporting ring 21, and the packer is in a permanent setting state. The illustrated anti-collision ring 24 prevents the pipe string from being damaged by an impact.

Example 4:

referring to fig. 3, further, the ball seat 4 is a soluble core shear ball seat, the soluble core shear ball seat includes a casing 26, a sealing ring 27 and a soluble core 29, the casing 26 is in a cylindrical structure, the soluble core 29 is disposed in the casing 26, the casing 26 includes an upper end and a lower end, the sealing ring 27 is disposed between an inner wall of the casing 26 at the upper end and an outer wall of the soluble core 29, and an end portion of the soluble core 29 disposed in a cavity of the upper end of the casing 26 is used for bearing the soluble ball 30.

Further, the soluble core shear ball seat also includes a shear pin 28, the shear pin 28 passing through the outer sleeve 26 and being connected to the soluble core 29.

In the above embodiment, the sealing ring 27 is used for playing a sealing role when the dissolvable ball 30 is thrown to press, the shear pin 28 provides a certain shear force for the pressing, the packer is ensured to be set, the pressure is continuously lifted after the packer is set, the shear pin 28 is sheared, the dissolvable core 29 and the dissolvable ball 30 fall into the artificial well bottom 7 together, finally all the dissolvable ball is melted off, a large drift diameter is realized in the pipe column, the well bore keeps a sufficient drift diameter, and the passing requirement of the gas injection well suction profile testing tool is met.

Example 5:

the application method of the multifunctional integrated pipe column for gas injection, test and pressurized operation comprises the following steps:

gas injection function:

the pipe column is lowered, the bell mouth 5 at the lower end of the pipe column is located at the gas injection layer 6, after the pipe column is lowered in place, the dissolvable ball 30 is thrown into the airtight oil pipe 1 to the upper end of the ball seat 4, a closed space is formed in the pipe column at the upper end of the ball seat 4 to be pressed, setting of the airtight packer 2 is completed, the pressure is increased, the shearing pin 28 is sheared, the dissolvable core 29 and the dissolvable ball 30 are lowered, the dissolvable ball falls into the artificial bottom 7 through the bell mouth 5, a gas injection channel is opened, and normal gas injection is implemented.

Test function:

when the soluble core 29 and the soluble ball 30 fall into the artificial well bottom 7, the dissolution is realized, and a large drift diameter is realized in the pipe column;

when the air suction profile test needs to be carried out, the test tool sequentially passes through the airtight oil pipe 1, the airtight packer 2, the blanking plug working cylinder 3, the ball seat 4 and the bell mouth 5 to carry out test operation.

The operation function is pressed in area:

the blanking plug working cylinder 3 is arranged on the pipe column, when the later operation with pressure is needed to start and trip, the blanking plug is put into the well head, the hydraulic pumping or steel wire operation and other modes can be adopted for the input, the blanking plug is put into the position of the blanking plug working cylinder 3, the rubber cylinder of the blanking plug is set, the internal blowout prevention function of the oil pipe is completed, and the operation function with pressure of the pipe column is realized.

Further, the soluble core 29 and the soluble balls 30 are soluble materials, and the soluble materials can be completely dissolved under certain medium, temperature and pressure.

In conclusion, the multifunctional integrated pipe column and the method for gas injection, test and pressurized operation have the advantages that pressurized operation and test functions are added on the premise that normal gas injection of the pipe column is guaranteed, and the multifunctional integrated pipe column and the method have important significance for improving efficiency and saving cost in oilfield gas drive tests.

The airtight packer 2 realizes the first deblocking and then deblocking, avoids deblocking difficulty, and overcomes the conditions of pipe column disconnection, overhaul and the like; when the blanking plug working cylinder 3 is used for tripping, the blanking plug is put into the working cylinder, the weighting rod is put into the working cylinder, the working cylinder is sealed by a leather cup, so that the oil pipe is blocked under pressure, the requirement of the operation under pressure is met, and the technical problem of blowout prevention in the oil pipe during tripping is effectively solved; the soluble core shear ball seat not only can meet the setting requirement of a packer, but also can keep enough borehole drift diameter through the dissolution of the soluble core, thereby providing convenience for the running of a gas injection well suction profile testing tool; the soluble core 29 and the soluble ball 30 are made of soluble materials, and can realize complete dissolution under certain medium, temperature and pressure, thereby effectively preventing the generation of well bore junk. The medium is generally klc solution or active water, etc. The temperature, pressure and medium of the different well conditions determine the properties of the dissolvable material, typically at 50-150 ℃ and at 35-105MPa.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the scope of the knowledge of those skilled in the art without departing from the spirit of the present invention, which is within the scope of the present invention.

Claims

1. A gas injection, test and operation multifunctional integrated tubular column under pressure, characterized by: the packer comprises an airtight oil pipe (1), a packer for firstly deblocking and then deblocking, a blanking plug working cylinder (3), a ball seat (4) and a bell mouth (5), wherein the airtight oil pipe (1), the packer, the blanking plug working cylinder (3), the ball seat (4) and the bell mouth (5) are sequentially connected; the sealing packer is an airtight sealing packer (2), the airtight sealing packer (2) comprises an upper joint (8), a central tube (9), a setting rubber cylinder (16), a setting piston (17), a lower joint (19), a meshing mechanism and an unclamping mechanism, wherein the upper joint (8) and the lower joint (19) are respectively connected to two ends of the central tube (9), the setting rubber cylinder (16), the setting piston (17) and the meshing mechanism are sleeved on the outer wall of the central tube (9) and are positioned between the upper joint (8) and the lower joint (19), one end of the meshing mechanism is connected with the upper joint (8), the other end of the meshing mechanism is in contact with one end of the setting rubber cylinder (16), one end of the setting rubber cylinder (16) is connected with the outer wall of the setting piston (17), the other end of the unclamping mechanism is connected with the lower joint (19), inner concave outer steps (25) of the central tube are respectively arranged on the outer side walls of two ends of the central tube (9), and the central tube (17) are communicated with a hydraulic inlet of the central tube (9); the ball seat (4) is a soluble core shearing ball seat;

the engagement mechanism comprises a connecting sleeve (11), an upper cone (12), a slip sleeve (13), a slip (14) and a lower cone (15), one end of the connecting sleeve (11) is connected to the outer wall of the upper joint (8), the other end of the connecting sleeve (11) is clamped on the outer wall of one end of the upper cone (12), the end of the upper cone (12) is contacted with the end of the upper joint (8), the upper cone (12), the slip (14) and the lower cone (15) are respectively sleeved on the outer wall of the central tube (9), the cone ends of the upper cone (12) and the lower cone (15) are oppositely arranged, and the slip (14) is positioned between the upper cone (12) and the lower cone (15);

the deblocking and unlocking mechanism comprises a lock sleeve (18), a lock ring (20), a supporting ring (21) and an anti-collision ring (24), wherein the anti-collision ring (24) is fixedly sleeved on the lower joint (19), one end of the lock sleeve (18) is connected with the outer wall of the setting piston (17), the other end of the lock sleeve (18) is connected with the outer wall of the anti-collision ring (24), the lock ring (20) and the supporting ring (21) are both positioned between the inner wall of the lock sleeve (18) and the outer wall of the lower joint (19), one end of the lock ring (20) is contacted with one end of the supporting ring (21), and the supporting ring (21) is connected with the outer wall of the lower joint (19);

the soluble core shearing ball seat comprises a jacket (26), a sealing ring (27) and a soluble core (29), wherein the jacket (26) is of a cylindrical structure, the soluble core (29) is arranged in the jacket (26), the jacket (26) comprises an upper end and a lower end, the sealing ring (27) is arranged between the inner wall of the upper end of the jacket (26) and the outer wall of the soluble core (29), and the end part of the soluble core (29) in the upper end cavity of the jacket (26) is used for bearing the soluble ball (30).

2. The multifunctional integrated pipe column for gas injection, test and pressurized operation according to claim 1, wherein the multifunctional integrated pipe column is characterized in that: the engagement mechanism also comprises an unlocking pin (10) and slip sleeves (13), one end of the connecting sleeve (11) is connected to the outer wall of the upper joint (8) through the unlocking pin (10), slip sleeves (13) are respectively connected to the upper cone (12) and the lower cone (15), and two ends of the slips (14) are respectively located in the two slip sleeves (13).

3. The multifunctional integrated pipe column for gas injection, test and pressurized operation according to claim 1, wherein the multifunctional integrated pipe column is characterized in that: the deblocking and unclamping mechanism further comprises a deblocking pin (22) and a starting shear pin (23), the other end of the lock sleeve (18) is connected with the outer wall of the anti-collision ring (24) through the starting shear pin (23), and the supporting ring (21) is connected with the outer wall of the lower joint (19) through the deblocking pin (22).

4. The multifunctional integrated pipe column for gas injection, test and pressurized operation according to claim 1, wherein the multifunctional integrated pipe column is characterized in that: the soluble core shear ball seat also comprises a shear pin (28), and the shear pin (28) passes through the outer sleeve (26) to be connected with the soluble core (29).

5. A method for using a multifunctional integrated pipe column for gas injection, test and pressurized operation, comprising the multifunctional integrated pipe column for gas injection, test and pressurized operation according to any one of claims 1-4, and characterized in that: the method comprises the following steps:

gas injection function:

the pipe column is lowered, a bell mouth (5) at the lower end of the pipe column is positioned at an air injection layer (6), after the pipe column is lowered in place, a soluble ball (30) is put into the pipe column from the airtight oil pipe (1) to the upper end of the ball seat (4), a closed space is formed in the pipe column at the upper end of the ball seat (4) to be suppressed, the setting of the airtight packer (2) is completed, the pressure is increased, a shearing pin (28) is sheared, a soluble core (29) and the soluble ball (30) are lowered, the soluble core falls into an artificial bottom hole (7) through the bell mouth (5), an air injection channel is opened, and normal air injection is implemented;

test function:

when the soluble core (29) and the soluble ball (30) fall into the artificial well bottom (7), the dissolution is realized, and the large diameter is realized in the pipe column;

when the air suction profile test is required to be carried out, the test tool sequentially passes through the airtight oil pipe (1), the airtight packer (2), the blanking plug working cylinder (3), the ball seat (4) and the bell mouth (5) to carry out test operation;

the operation function is pressed in area:

the blanking plug working cylinder (3) is arranged on the pipe column, when the later operation with pressure is needed to start and trip, the blanking plug is put into the well mouth, the blanking plug is put into the position of the blanking plug working cylinder (3), the rubber cylinder of the blanking plug is set, the internal blowout prevention function of the oil pipe is completed, and the operation function with pressure of the pipe column is realized.

6. The method for using the multifunctional integrated pipe column for gas injection, test and pressurized operation according to claim 5, wherein the method comprises the following steps: the soluble core (29) and the soluble ball (30) are soluble materials, and the soluble materials can be completely dissolved under certain medium, temperature and pressure.