CN114135243B - Failure-preventing composite expansion tool for equal-well-diameter expansion pipe - Google Patents
Failure-preventing composite expansion tool for equal-well-diameter expansion pipe Download PDFInfo
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- CN114135243B CN114135243B CN202111443453.8A CN202111443453A CN114135243B CN 114135243 B CN114135243 B CN 114135243B CN 202111443453 A CN202111443453 A CN 202111443453A CN 114135243 B CN114135243 B CN 114135243B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
Abstract
The invention relates to an anti-failure composite expansion tool for an equal-well-diameter expansion pipe. The expansion pipe comprises an adapter, a central pipe A, an expansion pipe, a sizing expansion core head, a near-cone joint, a piston sleeve A, a double-female piston joint, a variable-diameter cone upper fixing ring, a variable-diameter expansion core head, a reinforcing leather cup, a variable-diameter cone lower fixing ring, a single-female joint piston, a piston sleeve B, a U-shaped fixing sleeve, a tip cone valve sleeve, a bottom plug, a conical sealing ball seat, a sealing ball, a T-shaped ball pressing device, a lower U-shaped pressing sleeve, a reciprocating spring (21), a central pipe B, a starting pin and the like. The method is characterized in that: the anti-failure composite expansion tool can ensure that the expansion can be successfully completed when the sealing of the traditional expansion mode fails. The invention well solves the problem of construction failure caused by sealing failure of the expansion cone in the construction process of the expansion pipe, and saves a great deal of manpower, material resources and financial resources.
Description
Technical Field
The invention relates to an anti-failure composite expansion tool for an equal-well-diameter expansion pipe, belongs to the technical field of petroleum and natural gas exploitation, and particularly relates to a composite expansion tool.
Background
Drilling difficulties are increasing as the depth of production of the well increases. Expansion pipe technology is known as lunar engineering in the oil and gas industry, the application of the expansion pipe technology is also more and more extensive, and constant diameter drilling is a new mileage of expansion pipe technology development. The constant-diameter drilling technology can solve the problem of drilling deep wells, ultra-deep wells and complex wells, reduce the risk of drilling and improve the well structure under the conditions of not losing the size of the well and not affecting the subsequent drilling operation, and ensure the smooth drilling of a target layer. The successful expansion of an expansion pipe in the well is the guarantee of constant diameter drilling. The traditional expansion mode is that the expansion cone and the expansion pipe are sealed or the leather cup and the expansion pipe are sealed, but after the expansion pipe is expanded by large plastic deformation, the inner wall of the expansion pipe is uneven, the ovality of the inner diameter is aggravated, the unevenness of the inner wall is also sharply increased, the sealing failure is further caused, the expansion failure is caused, the expansion is forced to stop, and when serious, the expansion is stopped, a drilling mode is needed, a great amount of time is wasted, and serious economic waste is caused.
Aiming at the problems, the invention provides an equal-well-diameter expansion pipe failure-preventing composite expansion tool, which is designed on the basis of retaining the original expansion sealing mode, and can ensure the complete expansion construction of the expansion pipe, thereby reducing the failure probability of the expansion pipe in the expansion construction process and saving a great amount of time, manpower, material resources and financial resources.
Disclosure of Invention
The invention aims at: in order to ensure the complete expansion construction of the expansion pipe, the failure probability of the expansion pipe in the expansion construction process is reduced, and a large amount of time, manpower, material resources and financial resources are saved. The composite expansion tool for preventing the equal-well-diameter expansion pipe from failure is designed, the composite expansion of the expansion pipe can be realized, and the expansion construction can be continuously completed in a standby mode when the traditional mode fails.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the problem is as follows: the utility model provides an equal well diameter expansion pipe prevents compound inflation instrument of inefficacy, by adapter (1), center tube A (2), expansion tube (3), sizing expansion core (4), near conical joint (5), piston sleeve A (6), double female piston joint (7), fixed ring (8) on the reducing awl, variable diameter expansion core (9), strengthen leather cup (10), fixed ring (11) under the reducing awl, single female joint piston (12), piston sleeve B (13), U type fixed cover (14), tip cone valve pocket (15), bottom end cap (16), toper sealing ball seat (17), sealing ball (18), T type ball presser (19), lower U type die-lock cover (20), reciprocating spring (21), center tube B (22), start pin (23), O type sealing washer A (24), O type sealing washer B (25), O type sealing washer C (26), O type sealing washer D (27), O type sealing washer E (28), O type sealing washer F (29) constitution;
an equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: the adapter (1) is connected with the central tube A (2) through threads and an O-shaped sealing ring A (24) and has the functions of transmitting tension and passing fluid.
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: the central tube A (2) is connected with the double female piston joint (7) through threads, and an O-shaped sealing ring D (27) is arranged between the central tube A and the double female piston joint.
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: the near-cone joint (5) is connected with the piston sleeve A (6) through threads, and an O-shaped sealing ring C (26) is arranged between the near-cone joint and the piston sleeve A; the central tube B (22) is connected with the double female piston joint (7) through threads.
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: the fixed ring (8) on the reducing cone is connected with the piston sleeve A (6) through threads.
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: the fixed ring (8) on the reducing cone is connected with the central tube B (22) through the starting pin (23).
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: the reinforcing leather cup (10) is vulcanized on the fixed ring (11) under the reducing cone.
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: the lower fixing ring (11) of the reducing cone is sealed with the central tube B (22) through the O-shaped sealing ring B (25).
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: the single-female joint piston (12) is connected with the central tube B (22) through threads; the U-shaped fixing sleeve (14) is connected with the single-female joint piston (12) through threads.
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: the tip cone valve sleeve (15) is connected with the piston sleeve B (13) through threads; the bottom plug (16) is connected with the expansion pipe (3) through threads.
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: firstly, fixing an oil pipe connected with an adapter (1) on the ground, and pressing by a ground pressure pump; the high-pressure liquid enters the annular pressure cavity A (30) through the inner hole of the oil pipe, the inner hole of the central pipe A (2), the inner hole of the central pipe B (22) and the ring Zhou Xiaokong; then, the hydraulic pump continues to press, and at the moment, the variable diameter expansion core head (9) is folded upwards by pushing the fixed ring (11) under the variable diameter cone under the action of pressure, so that the expansion pipe (3) is expanded at the position of the variable diameter expansion core head (9); when the diameter-variable expansion core head (9) is completely closed, the tip cone valve sleeve (15) pushes the sealing ball (18) upwards, and the pressure in the pipe column suddenly drops; finally, the oil pipe string connected with the adapter (1) is released, the ground pressure pump continues to press, high-pressure liquid enters the inner cavity of the expansion pipe (3) through the peripheral hole of the tip cone valve sleeve (15), at the moment, the reinforcing leather cup (10) is sealed with the expansion pipe (3), the whole tool string is pushed to move upwards under the action of pressure, the expansion pipe (3) is expanded, and the expansion distance can be judged according to the upward moving distance of the oil pipe on the ground.
An equal well diameter expansion pipe prevents inefficacy composite expansion instrument which characterized in that: when the sealing of the reinforcing leather cup (10) fails, the pressure pump pressure is reduced, the ground oil pipe string is not moved, and a tool standby scheme is started; firstly, lifting an oil pipe string upwards, cutting off a starting pin (23), and continuing to lift for a travel distance, wherein the tip cone valve sleeve (15) is separated from the sealing ball (18), and the sealing ball (18) is sealed with the conical sealing ball seat (17) under the action of the reciprocating spring (21); then, the oil pipe string connected with the adapter (1) on the ground is fixed again, the pressure is pumped by a ground pressure pump, and high-pressure liquid enters an annular pressure cavity A (30) and an annular pressure cavity B (31); the near-cone joint (5) and the variable-diameter cone lower fixing ring (11) respectively push the sizing expansion core head (4) and the variable-diameter expansion core head (9) upwards to expand, when the expansion distance reaches a stroke, the tip cone valve sleeve (15) pushes the sealing ball (18) upwards, the pressure in the pipe column is reduced, the oil pipe is lifted up again after the expansion stroke is finished, and the operation is repeated.
The equal-well-diameter expansion pipe anti-failure composite expansion tool is characterized in that: the variable-diameter expansion core head (9) consists of four-petal variable-diameter sliding blocks, and the folding pressure is 20-30 MPa.
The equal-well-diameter expansion pipe anti-failure composite expansion tool is characterized in that: 6-8 starting pins (23) are arranged on the periphery of the starting pin, and the total shearing pressure is more than 30MPa.
The equal-well-diameter expansion pipe anti-failure composite expansion tool is characterized in that: the starting pin (23) limits the relative movement of the fixed ring (8) on the diameter-variable cone and the central tube B (22) when the diameter-variable expansion core head (9) is closed.
The equal-well-diameter expansion pipe anti-failure composite expansion tool is characterized in that: after the oil pipe is lifted, the tip cone valve sleeve (15) is separated from the sealing ball (18), and the sealing ball (18) descends under the action of the reciprocating spring (21) to realize sealing again.
The equal-well-diameter expansion pipe anti-failure composite expansion tool is characterized in that: when the seal of the reinforcing leather cup (10) fails, a standby scheme is used, when the indication of the ground pressure pump suddenly descends, the pressure pump is closed, the lifting oil pipe is fixed after a stroke of 400-450 mm, and then the pressure pump is started.
The equal-well-diameter expansion pipe anti-failure composite expansion tool is characterized in that: and 1-2 groups of sealing rings which are sealed with the expansion pipe (3) are arranged on the sizing expansion core head (4).
The equal-well-diameter expansion pipe anti-failure composite expansion tool is characterized in that: 3-4 groups of sealing rings are arranged between the double female piston connector (7) and the piston sleeve A (6) to form step sealing, and 100MPa pressure sealing can be achieved.
Compared with the prior art, the invention provides the equal-well-diameter expansion pipe failure prevention composite expansion tool, which can make up the defect that the expansion cannot be continued after the leather cup fails, and can successfully ensure the expansion no matter whether the leather cup fails or not.
Drawings
FIG. 1 is a schematic view of an initial installation position of the present invention;
FIG. 2 is a schematic diagram of the invention after the expansion and closure of the variable diameter;
FIG. 3 is a schematic expansion diagram of the reinforcement cup of the present invention without failure;
FIG. 4 is a schematic expansion diagram of the present invention when the reinforced cup fails;
FIG. 5 is a schematic view of the variable diameter expansion core print of the present invention with the variable diameter expansion core print separated;
FIG. 6 is a schematic diagram of the variable diameter expansion core of the present invention when closed;
FIG. 7 is a schematic diagram of an equal well diameter process of the present invention;
1. the hydraulic pressure type hydraulic pressure control device comprises a conversion joint, a central pipe A, a3 expansion pipe, a 4 sizing expansion core head, a 5 proximal cone joint, a6 piston sleeve A, a 7 double-female piston joint, a 8 reducing cone upper fixing ring, a 9 variable diameter expansion core head, a 10 reinforcing leather cup, a 11 reducing cone lower fixing ring, a 12 single-female joint piston, a 13 piston sleeve B, a 14U-shaped fixing sleeve, a 15 top cone valve sleeve, a 16 bottom plug, a 17 conical sealing ball seat, a 18 sealing ball, a 19T-shaped ball press, a 20 lower U-shaped sealing sleeve, a 21 reciprocating spring, a 22 central pipe B, a 23 actuating pin, a 24.O-shaped sealing ring A, a 25.O-shaped sealing ring B, a 26.O-shaped sealing ring C, a 27.O-shaped sealing ring D, a 28.O-shaped sealing ring E, a 29.O-shaped sealing ring F, a30 annular pressure cavity A and a 31 annular pressure cavity B.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings.
The specific embodiments of the invention described herein are for purposes of illustration only and are not to be construed as limiting the invention in any way. The skilled person can envisage any possible variations based on the invention, which are to be regarded as falling within the scope of the invention, under the teaching of the invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
According to the drawings, in order to achieve the above purpose, the technical scheme adopted by the invention for solving the problem is as follows: the utility model provides an equal well diameter expansion pipe prevents compound inflation instrument of inefficacy, by crossover sub 1, center tube A2, expansion tube 3, sizing expansion core 4, near conical joint 5, piston sleeve A6, two female piston joints 7, fixed ring 8 on the reducing cone, variable diameter expansion core 9, strengthen leather cup 10, fixed ring 11 under the reducing cone, single female joint piston 12, piston sleeve B13, U type fixed cover 14, tip cone valve housing 15, bottom plug 16, conical seal ball seat 17, sealing ball 18, T type ball press 19, lower U type die sleeve 20, reciprocating spring 21, center tube B22, start pin 23, O type sealing washer A24, O type sealing washer B25, O type sealing washer C26, O type sealing washer D27, O type sealing washer E28, O type sealing washer F29 is constituteed;
as shown in fig. 1, an anti-failure composite expansion tool for an expansion pipe with equal well diameter is characterized in that: the adapter 1 is connected with the central tube A2 through threads and an O-shaped sealing ring A24 and bears the functions of transmission of tensile force and fluid passing; the central tube A2 is connected with the double female piston joint 7 through threads, and an O-shaped sealing ring D27 is arranged between the central tube A2 and the double female piston joint; the near-cone joint 5 is connected with the piston sleeve A6 through threads, and an O-shaped sealing ring C26 is arranged between the near-cone joint and the piston sleeve A6; the central tube B22 is connected with the double female piston joint 7 through threads; the fixed ring 8 on the reducing cone is connected with the piston sleeve A6 through threads; the fixed ring 8 on the reducing cone is connected with the central tube B22 through the starting pin 23; the reinforcing leather cup 10 is vulcanized on the lower fixed ring 11 of the reducing cone; the diameter-variable cone lower fixing ring 11 is sealed with the central tube B22 through an O-shaped sealing ring B25; the single-female joint piston 12 is connected with the central tube B22 through threads; the U-shaped fixed sleeve 14 is connected with the single-female joint piston 12 through threads; the tip cone valve sleeve 15 is connected with the piston sleeve B13 through threads; the bottom plug 16 is connected with the expansion pipe 3 through threads;
as shown in fig. 1, first, an oil pipe connected to an adapter 1 on the ground is fixed, and is pressurized by a ground pressure pump; the high-pressure liquid enters the annular pressure cavity A30 through the inner hole of the oil pipe, the inner hole of the central pipe A2, the inner hole of the central pipe B22 and the ring Zhou Xiaokong; then, the hydraulic pump continues to press, and the fixed ring 11 under the reducing cone pushes the variable-diameter expansion core head 9 to be folded upwards under the action of pressure, so that the expansion pipe 3 is expanded at the position of the variable-diameter expansion core head 9;
as shown in fig. 2, after the variable diameter expansion core 9 is completely closed, the tip cone valve sleeve 15 pushes the sealing ball 18 up, and the pressure in the pipe column suddenly drops;
as shown in fig. 2-3, the oil pipe string connected with the adapter 1 is released, the ground pressure pump continues to press, high-pressure liquid enters the inner cavity of the expansion pipe 3 through the peripheral hole of the tip cone valve sleeve 15, at the moment, the reinforcing leather cup 10 and the expansion pipe 3 are sealed, the whole tool string is pushed to move upwards under the action of pressure, the expansion pipe 3 is expanded, and the expansion distance can be determined according to the upward moving distance of the oil pipe on the ground.
When the seal of the reinforcing leather cup 10 fails, the pressure of the pressure pump is reduced, the ground oil pipe string is not moved, and a tool standby scheme is started;
as shown in fig. 4, firstly, the oil pipe string is lifted upwards, the starting pin 23 is sheared, and the lifting is continued for a travel distance, at this time, the tip cone valve sleeve 15 is separated from the sealing ball 18, and the sealing ball 18 is sealed with the conical sealing ball seat 17 under the action of the reciprocating spring 21; then, the oil pipe string connected with the adapter 1 on the ground is fixed again, the pressure is pumped by a ground pressure pump, and high-pressure liquid enters an annular pressure cavity A30 and an annular pressure cavity B31; the near-cone joint 5 and the variable-diameter cone lower fixing ring 11 respectively push the sizing expansion core head 4 and the variable-diameter expansion core head 9 upwards to expand, when the expansion distance reaches a stroke, the top cone valve sleeve 15 pushes the sealing ball 18 upwards, the pressure in the pipe column is reduced, the expansion stroke is finished, the oil pipe is lifted again, and the operation is repeated.
As shown in fig. 5, the variable diameter expansion core 9 is composed of four-petal variable diameter sliding blocks, and the folding pressure is 20 MPa-30 MPa.
As shown in fig. 6, after the variable diameter expansion core 9 is closed, the outer diameter is increased to a design value.
The number of the starting pins 23 is 6-8, and the total shearing pressure is more than 30MPa.
The starting pin 23 limits the relative movement of the fixed ring 8 on the diameter-variable cone and the central tube B22 when the diameter-variable expansion core 9 is closed.
When the oil pipe is lifted up, the tip cone valve sleeve 15 is separated from the sealing ball 18, and the sealing ball 18 descends under the action of the reciprocating spring 21 to realize sealing again.
When the seal of the reinforcing leather cup 10 fails, a standby scheme is used, when the indication of the ground pressure pump suddenly descends, the pressure pump is closed, the lifting oil pipe is fixed after a stroke of 400 mm-450 mm, and then the pressure pump is started.
And 1-2 groups of sealing rings which are sealed with the expansion pipe 3 are arranged on the sizing expansion core head 4.
3-4 groups of sealing rings are arranged between the double female piston connector 7 and the piston sleeve A6 to form step sealing, and 100MPa pressure sealing can be achieved.
The foregoing description of the preferred embodiment of the invention is not intended to limit the spirit and principles of the invention, but rather to enable any modification, equivalents, improvements and/or the like to be made within the scope of the invention.
Claims (8)
1. The utility model provides an equal well diameter expansion pipe prevents compound inflation instrument of inefficacy, by adapter (1), center tube A (2), expansion tube (3), sizing expansion core (4), near conical joint (5), piston sleeve A (6), double female piston joint (7), fixed ring (8) on the reducing awl, variable diameter expansion core (9), strengthen leather cup (10), fixed ring (11) under the reducing awl, single female joint piston (12), piston sleeve B (13), U type fixed cover (14), tip cone valve pocket (15), bottom end cap (16), toper sealing ball seat (17), sealing ball (18), T type ball presser (19), lower U type die-lock cover (20), reciprocating spring (21), center tube B (22), start pin (23), O type sealing washer A (24), O type sealing washer B (25), O type sealing washer C (26), O type sealing washer D (27), O type sealing washer E (28), O type sealing washer F (29) constitution;
the technical characteristics are that: the adapter (1) is connected with the central tube A (2) through threads and an O-shaped sealing ring A (24); the central tube A (2) is connected with the double female piston joint (7) through threads, and an O-shaped sealing ring D (27) is arranged between the central tube A and the double female piston joint; the near-cone joint (5) is connected with the piston sleeve A (6) through threads, and an O-shaped sealing ring C (26) is arranged between the near-cone joint and the piston sleeve A; the central tube B (22) is connected with the double female piston joint (7) through threads; the fixed ring (8) on the reducing cone is connected with the piston sleeve A (6) through threads; the fixed ring (8) on the reducing cone is connected with the central tube B (22) through a starting pin (23); the reinforcing leather cup (10) is vulcanized on the lower fixing ring (11) of the reducing cone; the diameter-variable cone lower fixing ring (11) is sealed with the central tube B (22) through the O-shaped sealing ring B (25); the single-female joint piston (12) is connected with the central tube B (22) through threads; the U-shaped fixed sleeve (14) is connected with the single-female joint piston (12) through threads; the tip cone valve sleeve (15) is connected with the piston sleeve B (13) through threads; the bottom plug (16) is connected with the expansion pipe (3) through threads;
firstly, fixing an oil pipe on the ground and connected with an adapter (1), pressing by a ground pressure pump, enabling liquid to pass through an inner hole of the oil pipe, an inner hole of a central pipe A (2), an inner hole of a central pipe B (22) and a ring Zhou Xiaokong of the central pipe B (22) to enter an annular pressure cavity A (30), pushing a fixed ring (11) under a reducing cone to fold up a variable-diameter expansion core head (9), and pushing a sealing ball (18) to be pushed up by a tip cone valve sleeve (15) after the variable-diameter expansion core head (9) is fully folded up, so that the pressure in a pipe column is reduced; the annular pressure cavity A (30) is formed by enclosing a variable-diameter cone lower fixing ring (11), a single-female joint piston (12), a piston sleeve B (13) and a central tube B (22); then, releasing the oil pipe connected with the adapter (1), continuously pressing by a ground pressure pump, enabling the liquid pressure to enter the inner cavity of the expansion pipe (3) through the peripheral hole of the tip cone valve sleeve (15), sealing the reinforcing leather cup (10) and the expansion pipe (3), and moving the oil pipe upwards when the expansion pressure is reached, so as to successfully start expansion;
when the seal of the reinforcing leather cup (10) fails, a standby scheme is started, firstly, the oil pipe is lifted upwards, the starting pin (23) is sheared, the tip cone valve sleeve (15) is separated from the sealing ball (18), and the sealing ball (18) is sealed with the conical sealing ball seat (17) under the action of the reciprocating spring (21); then fixing an oil pipe on the ground and connected with the adapter (1), pressing by a ground pressure pump, enabling liquid to pass through an inner hole of the oil pipe, an inner hole of a central pipe A (2), an inner hole of a central pipe B (22), a ring Zhou Xiaokong of the central pipe B (22) to enter the annular pressure cavity A (30), enabling liquid to pass through the inner hole of the oil pipe, the inner hole of the central pipe A (2) and a ring Zhou Xiaokong of the central pipe A (2) to enter the annular pressure cavity B (31); the annular pressure cavity A (30) is formed by enclosing a variable-diameter cone lower fixing ring (11), a single-female joint piston (12), a piston sleeve B (13) and a central tube B (22); the annular pressure cavity B (31) is surrounded by a near-cone joint (5), a piston sleeve A (6), a double-female piston joint (7) and a central tube A (2); the near-cone joint (5) and the variable-diameter cone lower fixing ring (11) respectively push the sizing expansion core head (4) and the variable-diameter expansion core head (9) upwards to expand, when the top cone valve sleeve (15) pushes the sealing ball (18) upwards, the pressure in the pipe column is reduced, one expansion stroke is ended, the oil pipe is lifted up again, and the pressure continues to be pressed.
2. The equal well diameter expansion pipe failure prevention composite expansion tool according to claim 1, wherein: the variable-diameter expansion core head (9) consists of four-petal variable-diameter sliding blocks, and the folding pressure is 20-30 MPa.
3. The equal well diameter expansion pipe failure prevention composite expansion tool according to claim 1, wherein: 6-8 starting pins (23) are arranged on the periphery of the starting pin, and the total shearing pressure is more than 30MPa.
4. The equal well diameter expansion pipe failure prevention composite expansion tool according to claim 1, wherein: the starting pin (23) is used for fixing the axial movement of the fixing ring (8) on the variable diameter cone when the variable diameter expansion core head (9) is folded.
5. The equal well diameter expansion pipe failure prevention composite expansion tool according to claim 1, wherein: after the oil pipe is lifted, the tip cone valve sleeve (15) is separated from the sealing ball (18), and the sealing ball (18) descends under the action of the reciprocating spring (21) to realize sealing again.
6. The equal well diameter expansion pipe failure prevention composite expansion tool according to claim 1, wherein: when the seal of the reinforcing leather cup (10) fails and a standby scheme is used, when the indication of the ground pressure pump drops sharply, the pressure pump is closed, the lifting oil pipe is fixed after 400-450 mm, and then the pressure pump is started.
7. The equal well diameter expansion pipe failure prevention composite expansion tool according to claim 1, wherein: and 1-2 groups of sealing rings which are sealed with the expansion pipe (3) are arranged on the sizing expansion core head (4).
8. The equal well diameter expansion pipe failure prevention composite expansion tool according to claim 1, wherein: 3-4 groups of sealing rings are arranged between the double female piston connector (7) and the piston sleeve A (6) to form step seal, so that 100MPa pressure seal can be realized.
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