CN113250638B - Hydraulic pipe expanding device and method for performing pipe expanding treatment - Google Patents

Abstract

The application discloses a hydraulic pipe expanding device and a method for pipe expanding treatment, and belongs to the technical field of pipe expanders. The hydraulic pipe expanding device comprises a hydraulic anchor, a constant pressure valve, a hydraulic cylinder and a pipe expanding head, wherein the hydraulic cylinder comprises a tubular shell and a barrel-shaped inner cylinder. The hydraulic anchor, the constant pressure valve and the barrel-shaped inner cylinder are sequentially connected and are internally communicated, and the tubular shell is slidably mounted on the barrel-shaped inner cylinder and is connected with the pipe expanding head. The hydraulic pipe expanding device is connected with the operating machine through an oil pipe, a technician utilizes the operating machine to pump liquid into the hydraulic pipe expanding device, and the tubular shell pushes the pipe expanding head to move towards the direction far away from the hydraulic anchor under the driving of hydraulic pressure, so that the pipe expanding head can roll the deformed part of the sleeve. Therefore, the pipe expanding treatment is carried out by utilizing hydraulic pressure, and the situation that when the pipe expanding head is pressed down directly through an operating machine, a large part of force applied to the deformation position of the sleeve pipe can act on the sleeve pipe of the pipe bending section, so that the pressure applied to the deformation position of the sleeve pipe is not large enough, and the deformation position is difficult to flatten is avoided.

Description

Hydraulic pipe expanding device and method for performing pipe expanding treatment

Technical Field

The application relates to the technical field of pipe expanders, in particular to a hydraulic pipe expanding device and a method for performing pipe expanding processing.

Background

The casing is a steel pipe installed in the well and used for supporting the well wall. In the oil production process, the pressure applied to the casing by the underground stratum and the fluid can be changed continuously, so that the casing is easy to deform, and the inner diameter of the casing is reduced. The reduction of the inner diameter of the sleeve can seriously affect the use of downhole tools such as an oil well pump, a sucker rod and the like, and the expansion of the deformed sleeve is necessary to restore the original size of the sleeve.

In the related art, technicians add an expansion head at the lower end of an oil pipe and lower the oil pipe into a casing pipe through a workover rig. When the pier pressure head meets the deformation part of the sleeve, a technician applies downward pressure to the oil pipe through the workover rig, so that the expansion pipe head carries out pier pressure on the deformation part of the sleeve, the deformation part is flattened, and the purpose of expanding the pipe is achieved.

In the course of implementing the present application, the inventors found that there are at least the following problems in the related art:

when the pipe expanding operation is carried out in the directional well, the directional well is a non-vertical well and is provided with a bent pipe section, a large part of force applied by the workover rig can act on a sleeve of the bent pipe section, so that the pressure applied to the deformed part of the sleeve by the pipe expanding head is not large enough, the deformed part is difficult to flatten, and the purpose of pipe expanding cannot be achieved.

Disclosure of Invention

In view of this, the present application provides a hydraulic pipe expanding device and a method for performing pipe expanding processing, which can be applied to various well types to effectively flatten a deformed portion of a casing pipe. The technical scheme is as follows:

on the one hand, this application embodiment provides a hydraulic pressure expand tube device, hydraulic pressure expand tube device includes hydraulic anchor, constant pressure valve, pneumatic cylinder and expand tube head, the constant pressure valve includes tubulose valve body, spheroid, tubulose ball seat, first extensible member and solid fixed ring, the pneumatic cylinder includes tubbiness inner cylinder and tubulose shell, wherein:

the hydraulic anchor, the constant pressure valve, the hydraulic cylinder and the pipe expanding head are sequentially connected, a barrel-shaped inner cylinder of the hydraulic cylinder is fixed on the constant pressure valve, the pipe expanding head is fixed on a tubular shell of the hydraulic cylinder, the end part of the hydraulic anchor, far away from the constant pressure valve, is fixed on an oil pipe, and the oil pipe, the hydraulic anchor, the constant pressure valve and the barrel-shaped inner cylinder of the hydraulic cylinder are communicated;

the tubular ball seat of the constant pressure valve comprises a first ball seat pipe section and a second ball seat pipe section which are fixed with each other, the inner diameter of the first ball seat pipe section is larger than the outer diameter of the ball body, the outer diameter of the ball body is larger than the inner diameter of the second ball seat pipe section, a ball body limiting structure is installed in the first ball seat pipe section, and the ball body is located between the ball body limiting structure and the second ball seat pipe section;

the tubular valve body of the constant pressure valve comprises a first valve body pipe section and a second valve body pipe section, the inner diameter of the first valve body pipe section is smaller than that of the second valve body pipe section, the fixing ring is installed in the second valve body pipe section, the first telescopic piece is located in the second valve body pipe section, the first end of the first telescopic piece is fixed on the tubular ball seat, and the second end of the first telescopic piece is fixed on the fixing ring;

the tubular ball seat is slidably mounted in the tubular valve body, when the end part of the tubular ball seat, far away from the first telescopic piece, extends into the first valve body pipe section, the outer wall of the tubular ball seat is attached to the inner wall of the first valve body pipe section, and a space is reserved between the outer wall of the tubular ball seat and the inner wall of the second valve body pipe section;

the tubular outer shell of the hydraulic cylinder is slidably mounted on the barrel-shaped inner cylinder, a sealing cavity is formed between the barrel-shaped inner cylinder and the tubular outer shell, a through hole is formed in the wall of the barrel-shaped inner cylinder at a position corresponding to the sealing cavity, when liquid is input to the hydraulic tube expanding device through the oil tube, the liquid in the barrel-shaped inner cylinder enters the sealing cavity through the through hole, and the liquid in the sealing cavity pushes the tubular outer shell to slide relative to the barrel-shaped inner cylinder;

the tubular valve body is provided with a pressure relief opening on the pipe wall corresponding to the first valve body pipe section, the outer wall of the tubular valve body is provided with a short pipe corresponding to the pressure relief opening, the sleeve is provided with a short pipe capable of sliding relative to the tubular valve body, the tubular shell is far away from the end part of the tube expansion head and connected with the short pipe, and when the tubular shell slides relative to the barrel-shaped inner cylinder, the short pipe is driven to slide relative to the tubular valve body, so that liquid in the tubular valve body flows out of the pressure relief opening.

Optionally, the barrel-shaped inner cylinder of the hydraulic cylinder includes an upper joint, a central tube and a sealing element which are connected in sequence, the tubular housing of the hydraulic cylinder includes a first tubular housing and a second tubular housing which are connected, the first tubular housing is connected with the short tube through an external connection tube, wherein:

the upper joint and the central pipe are both of tubular structures, the first end of the upper joint is in threaded connection with the second end of the constant pressure valve, the second end of the upper joint is located in the central pipe, the inner wall of the central pipe is attached to the outer wall of the upper joint, the pipe wall of the central pipe is connected with the pipe wall of the upper joint through screws, and the second end of the central pipe is connected with the sealing element;

the first end of the first tubular shell is connected with the second end of the outer connecting pipe, the first end of the outer connecting pipe is provided with a clamping groove, the outer connecting pipe passes through the clamping groove and is connected with the short pipe, the second end of the first tubular shell is connected with the first end of the second tubular shell, the second end of the second tubular shell is connected with the pipe expanding head, the outer wall of the first end of the central pipe is attached to the inner wall of the first tubular shell, the inner wall of the second end of the first tubular shell is attached to the outer wall of the central pipe, the outer wall of the first end of the central pipe is attached to the inner wall of the first tubular shell, a sealing ring is arranged between the inner wall of the second end of the first tubular shell and the outer wall of the central pipe, and the sealing cavity is a cavity between the first end of the central pipe and the second end of the first tubular shell.

Optionally, the number of the central tubes is at least two, the number of the first tubular housings is at least two, and the number of the central tubes is equal to the number of the first tubular housings, wherein:

the at least two central pipes are sequentially connected end to end, the central pipe close to the hydraulic anchor is connected with the upper joint, and the central pipe close to the tube expansion head is connected with the sealing element;

the first tubular shells close to the hydraulic anchor are connected with the short pipe through the external connecting pipe, and the first tubular shells close to the tube expanding head are connected with the second tubular shells.

Optionally, the expand tube head includes connecting pipe, dabber, split head and locking cap, wherein:

an annular boss is arranged on the inner wall of the connecting pipe, an annular bulge is arranged at the first end of the mandrel, the outer diameter of the annular bulge is smaller than the inner diameter of the connecting pipe and larger than the inner diameter of the annular boss, and the outer diameter of the mandrel is smaller than the inner diameter of the annular boss;

the first end of the connecting pipe is connected with the second end of the tubular shell, the mandrel is positioned in the connecting pipe, the fixing cap is fixed with the second end of the mandrel, and the valve splitting head is sleeved on the mandrel and positioned between the connecting pipe and the fixing cap.

Optionally, the mouth-expanding head still includes the second extensible member, the second extensible member is installed the spindle, and is located annular boss with between the annular arch, the split type structure is held to the split type head, the first end of split type head is located in the connecting tube, the second end of split type head is located in the locking cap, the split type head with dabber clearance fit.

In another aspect, an embodiment of the present application provides a method for performing a tube expansion process, where the method for performing a tube expansion process includes:

acquiring the current size of a deformed position of a casing in an operation well;

determining a hydraulic pipe expanding device matched with the current size of the deformation part;

the hydraulic pipe expanding device which is arranged on the operation machine through an oil pipe is lowered to the deformation position of the casing pipe in the operation well;

pumping liquid into the hydraulic pipe expansion device through the oil pipe to open a hydraulic anchor of the hydraulic pipe expansion device and fix the hydraulic pipe expansion device in the working well;

continuously pumping liquid into the hydraulic pipe expanding device to roll the deformed part by the hydraulic pipe expanding device;

and when the decrease value of the hydraulic pressure in the hydraulic pipe expansion device within the preset time is detected to be larger than or equal to the pressure drop threshold value, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the operation machine to take the hydraulic pipe expansion device out of the operation well.

Optionally, when it is detected that a decrease value of the hydraulic pressure in the hydraulic pipe expansion device within a preset time period is greater than or equal to a pressure drop threshold, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the working machine to take the hydraulic pipe expansion device out of the working well includes:

according to the period that the time length of stopping pumping the liquid is the target time length when the hydraulic pressure rises to the target pressure value, pumping the liquid into the hydraulic pipe expanding device;

and when the decrease value of the hydraulic pressure in the hydraulic pipe expansion device within the preset time is detected to be larger than or equal to the pressure drop threshold value, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the operation machine to take the hydraulic pipe expansion device out of the operation well.

Optionally, when it is detected that a decrease value of the hydraulic pressure in the hydraulic pipe expansion device within a preset time period is greater than or equal to a pressure drop threshold, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the working machine to take the hydraulic pipe expansion device out of the working well includes:

when the fact that the reduction value of the hydraulic pressure in the hydraulic pipe expansion device within the preset time is larger than the pressure drop threshold value is detected, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the working machine to lift and lower the hydraulic pipe expansion device at the deformed position;

and when the times of lifting and lowering reach the target times, controlling the operating machine to take the hydraulic pipe expanding device out of the operating well.

Optionally, after the detecting that the reduction value of the hydraulic pressure in the hydraulic pipe expansion device within the preset time period is greater than or equal to the pressure drop threshold value, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the working machine to take the hydraulic pipe expansion device out of the working well, the method for performing pipe expansion processing further includes:

if the current size of the deformed position of the casing in the operation well meets the preset condition, ending the pipe expansion processing of the casing in the operation well;

and if the current size of the deformed position of the casing in the operation well is detected not to meet the preset condition, turning to the step of obtaining the current size of the deformed position of the casing in the operation well, and continuing to perform the pipe expanding treatment on the casing in the operation well.

Optionally, the determining the hydraulic tube expansion device adapted to the current size of the deformation comprises:

and determining an expansion head of the hydraulic expansion device matched with the size of the deformation position.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects:

in this application embodiment, hydraulic pressure expand tube device includes hydraulic anchor, constant pressure valve, pneumatic cylinder and expand tube head, and the pneumatic cylinder includes tubulose shell and tubbiness inner cylinder. The hydraulic anchor, the constant pressure valve and the barrel-shaped inner cylinder are sequentially connected and are internally communicated, and the tubular shell is slidably mounted on the barrel-shaped inner cylinder and is connected with the pipe expanding head. The hydraulic pipe expanding device is connected with the operating machine through an oil pipe, a technician pumps liquid into the hydraulic pipe expanding device by using the operating machine, and the tubular shell pushes the pipe expanding head to move towards the direction far away from the hydraulic anchor under the driving of hydraulic pressure, so that the pipe expanding head can roll the deformed part of the sleeve. Therefore, the pipe expanding head does not need to be directly pressed down by the operation machine, but the pipe expanding treatment is carried out by utilizing hydraulic pressure, so that the condition that the pressure applied to the deformation part of the sleeve is not large enough and the deformation part is difficult to flatten due to the fact that a large part of the force applied to the deformation part of the sleeve can act on the sleeve of the pipe bending section is avoided.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a hydraulic pipe expanding device according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a constant pressure valve provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a hydraulic cylinder according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of an expansion head provided in an embodiment of the present application;

fig. 5 is a flowchart of a method for performing a tube expansion process according to an embodiment of the present application.

The reference numerals in the figures denote:

1-the hydraulic anchor is used for anchoring the soil,

2-a constant pressure valve, 21-a tubular valve body, 22-a ball, 23-a tubular ball seat, 24-a first telescopic piece, 25-a fixed ring, 26-a pressure relief opening, 27-a short pipe, 231-a first ball seat pipe section, 232-a second ball seat pipe section, 233-a ball limit structure,

3-hydraulic cylinder, 31-barrel-shaped inner cylinder, 32-tubular shell, 33-sealing cavity, 34-through hole, 311-upper joint, 312-central tube, 313-sealing element, 321-first tubular shell, 322-second tubular shell,

4-tube expanding head, 41-connecting tube, 42-mandrel, 43-second telescopic piece, 44-split head, 45-fixing cap, 411-annular boss, 421-annular bulge,

5-external connection pipe.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

During the production of oil, the downhole formations and fluids are constantly moving, and the pressure on the casing supporting the wall of the well is constantly changing, which in turn causes casing deformation that can prevent the normal use of downhole tools. Technicians usually install an expansion pipe head at the lower end of an oil pipe, the expansion pipe head is lowered to a deformed position in the sleeve by using a workover rig, and the expansion pipe head is pressed against the deformed position of the sleeve by means of jerking and jerking, so that the sleeve is restored to the original size. However, for a non-vertical directional well, a large part of the force applied by the workover rig acts on the casing of the bent pipe section, so that the pressure applied to the deformed part of the casing is not large enough, and the deformed part is difficult to flatten, thereby achieving the purpose of pipe expansion. In addition, in some cases, the deformed part of the casing pipe can be elastically deformed to allow the expansion head to pass through, and then when the expansion head is lifted by the workover rig, the expansion head is easily clamped to cause the expansion head not to be lifted, and even the expansion head can be damaged. The application provides a hydraulic pipe expanding device and a method for performing pipe expanding treatment, which can solve the problems.

Fig. 1 is a schematic structural diagram of a hydraulic pipe expanding device provided by an embodiment of the present application, and referring to fig. 1, the hydraulic pipe expanding device includes a hydraulic anchor 1, a constant pressure valve 2, a hydraulic cylinder 3 and a pipe expanding head 4. The constant pressure valve 2 includes a tubular valve body 21, a ball 22, a tubular ball seat 23, a first telescopic member 24, and a fixing ring 25. The hydraulic cylinder 3 includes a barrel-shaped inner cylinder 31 and a tubular outer casing 32.

The hydraulic pipe expanding device is connected with the operation machine through an oil pipe, the operation machine is used for placing the hydraulic pipe expanding device to the deformation position of the casing pipe, and liquid is pumped into the hydraulic pipe expanding device through the oil pipe. The oil pipe, the hydraulic anchor 1, the constant pressure valve 2 and the barrel-shaped inner cylinder 31 of the hydraulic cylinder 3 are sequentially connected and are internally communicated, and the tubular shell 32 of the hydraulic cylinder 3 is connected with the hydraulic anchor 1. The hydraulic anchor 1 is used for fixing the hydraulic pipe expanding device at the deformation position of the sleeve; the constant pressure valve 2 is used for maintaining the hydraulic pressure in the hydraulic anchor 1 and keeping the hydraulic anchor 1 open; the hydraulic cylinder 3 can extend under the hydraulic pushing action and is used for pushing the tube expansion head 4; the tube expansion head 4 is used for rolling the deformed part of the sleeve.

For the hydraulic anchor 1, referring to fig. 1, the hydraulic anchor 1 may include a double-layered shell, a bead, and a fluke.

Wherein, the inner shell and the outer shell are provided with small holes at corresponding positions, and the diameter of the small hole on the outer shell is larger than that of the small hole on the inner shell. A plurality of concave anchor flukes are arranged between the outer shell and the inner shell, the diameter of the bottom surface of each anchor fluke is larger than that of the small hole in the inner shell, and the side surfaces of the anchor flukes can be attached to the inner wall of the small hole in the outer shell. And a pressing strip is arranged on the outer shell, corresponds to the lower concave part of the fluke and is used for limiting the fluke and preventing the fluke from falling out of the hydraulic anchor 1.

In implementation, when the hydraulic pressure in the hydraulic anchor 1 rises, the protrusions on two sides of the concave-shaped fluke extend out of the small holes in the outer shell and are in close contact with the inner wall of the casing pipe, and then the hydraulic pipe expanding device can be fixed at the deformed position of the casing pipe.

With respect to the constant pressure valve 2, referring to fig. 1 and 2, the constant pressure valve 2 includes a tubular valve body 21, a ball 22, a tubular ball seat 23, a first telescopic member 24, and a fixed ring 25. The ball 22 is located in the tubular ball seat 23, and the tubular ball seat 23, the first telescopic member 24 and the fixing ring 25 are located in the tubular valve body 21.

The tubular ball seat 23 includes a first ball seat pipe section 231 and a second ball seat pipe section which are fixed to each other, the inner diameter of the first ball seat pipe section 231 is larger than the outer diameter of the ball 22, the outer diameter of the ball 22 is larger than the inner diameter of the second ball seat pipe section 232, a ball limiting structure 233 is installed in the first ball seat pipe section 231, and the ball 22 is limited between the ball limiting structure 233 and the second ball seat pipe section 232.

The tubular valve body 21 of the constant pressure valve 2 comprises a first valve body section and a second valve body section, the inner diameter of the second valve body section being larger than the inner diameter of the first valve body section and the outer diameter of the tubular ball seat 23. A retaining ring 25 is mounted in the second valve body tube section for retaining the first telescoping piece 24 in the second valve body tube section. A first telescoping member 24 is located between the ball seat tube section and the fixed ring 25, the first telescoping member 24 may be a spring.

In practice, the tubular ball seat 23 is slidably mounted in the tubular valve body 21, the first telescopic member 24 being in a compressed state. When liquid is not pumped into the hydraulic pipe expanding device, due to the elastic force provided by the first telescopic piece 24, the end part of the tubular ball seat 23 far away from the first telescopic piece 24 extends into the first valve body pipe section, and the outer wall of the tubular ball seat 23 is tightly attached to the inner wall of the first valve body pipe section. The inner diameter of second ball seat tube section 232 is smaller than the outer diameter of ball 22 and ball 22 seals off the entrance of second ball seat tube section 232. At this time, the first valve body section and the second valve body section of the constant pressure valve 2 are not communicated.

When liquid is pumped into the hydraulic expansion tubular device, the first valve body pipe section is not communicated with the second valve body pipe section, so that the liquid cannot continuously enter the hydraulic cylinder 3 through the constant pressure valve 2 after passing through the oil pipe and the hydraulic anchor 1, and is gathered in the first valve body pipe section of the constant pressure valve 2. Therefore, the hydraulic pressure in the hydraulic anchor 1 and the first valve body pipe section is increased, the fluke of the hydraulic anchor 1 extends out to abut against the inner wall of the casing pipe, and the hydraulic pipe expanding device can be fixed in the casing pipe. The stiffness coefficient of the first telescopic element 24 is matched to the hydraulic pressure required by the hydraulic anchor 1, ensuring that the tubular ball seat 23 is not pushed completely into the second valve body pipe section by the liquid before the hydraulic anchor 1 is fully expanded.

As the work machine continues to pump fluid into the hydraulic expansion device, the hydraulic anchor 1 and the first valve body section become increasingly hydraulically pressurized until the hydraulic pressure exceeds the spring force provided by the first telescoping member 24, and the tubular ball seat 23 is fully urged by the fluid into the second valve body section. At the moment when the tubular ball seat 23 is completely pushed into the second valve body pipe section by the liquid, since the inner diameter of the second valve body pipe section is larger than the outer diameter of the tubular ball seat 23, a gap exists between the inner wall of the second valve body pipe section and the outer wall of the ball seat pipe section, so that the first valve body pipe section is communicated with the second valve body pipe section, and the liquid can enter the barrel-shaped inner cylinder 31 of the hydraulic cylinder 3 through the second valve body pipe section.

At the same time, however, the hydraulic pressure in the hydraulic anchor 1 and the first valve body section will drop rapidly, allowing the first telescoping member 24 to push the ball seat section back into the first valve body section, disconnecting the first valve body section from the second valve body section. The working machine still continuously pumps liquid into the hydraulic pipe expanding device, and the hydraulic pressure in the first valve body pipe section and the hydraulic anchor 1 rapidly rises again, so that the first valve body pipe section is communicated with the second valve body pipe section again.

It can be seen that as long as the working machine can continuously pump liquid into the hydraulic pipe expanding device, the elastic force provided by the first telescopic member 24 and the hydraulic pressure in the hydraulic anchor 1 and the first valve body pipe section can form a dynamic balance, so that the hydraulic pressure in the hydraulic anchor 1 can fluctuate within a small range in the process of liquid entering the hydraulic cylinder 3, and can be approximately regarded as a constant pressure. Therefore, the fluke of the hydraulic anchor 1 can be ensured to be completely opened all the time, and the hydraulic pipe expanding device can be firmly fixed at the deformed position of the sleeve in the pipe expanding process.

As for the hydraulic cylinder 3, referring to fig. 1 and 3, the hydraulic cylinder 3 includes a tubular outer shell 32 and a barrel-shaped inner cylinder 31, the barrel-shaped inner cylinder 31 is connected to the constant pressure valve 2, and the tubular outer shell 32 of the hydraulic cylinder 3 is slidably mounted on the barrel-shaped inner cylinder 31 and connected to the expansion head 4. A sealing cavity 33 is arranged between the barrel-shaped inner cylinder 31 and the tubular outer shell 32, and a through hole 34 is arranged on the cylinder wall of the barrel-shaped inner cylinder 31 at a position corresponding to the sealing cavity 33.

Wherein, the barrel-shaped inner cylinder 31 is communicated with the sealed cavity 33 through a through hole 34. A part of the inner wall of the tubular outer housing 32 is closely attached to the outer wall of the barrel-shaped inner casing 31, and a part of the outer wall of the barrel-shaped inner casing 31 is closely attached to the inner wall of the tubular outer housing 32, forming the sealed chamber 33. The larger the sealed chamber 33, the further the distance between a portion on the inner wall of the tubular outer casing 32 constituting it and a portion on the outer wall of the barrel-shaped inner cylinder 31.

In operation, the liquid passing through the constant pressure valve 2 enters the barrel-shaped inner cylinder 31 of the hydraulic cylinder 3, and when the barrel-shaped inner cylinder 31 is filled with the liquid in the barrel-shaped inner cylinder 31, the working machine continuously pumps the liquid into the hydraulic pipe expanding device, so that the hydraulic pressure in the hydraulic anchor 1, the constant pressure valve 2 and the barrel-shaped inner cylinder 31 is continuously increased. In the process, the hydraulic anchor 1, the constant pressure valve 2, the barrel-shaped inner cylinder 31 and the sealing cavity 33 are filled with liquid all the time.

When the hydraulic pressure in the barrel 31 is sufficiently high, since the tubular housing 32 is slidably mounted on the barrel 31, the fluid pushes the two components of the sealed chamber 33, causing a portion of the inner wall of the tubular housing 32 and a portion of the outer wall of the barrel 31 to move in opposite directions. And because of the fixed action of the hydraulic anchor 1, the barrel-shaped inner cylinder 31 indirectly connected with the hydraulic anchor 1 cannot move, so that the tubular shell 32 of the hydraulic cylinder 3 can move in the direction away from the hydraulic anchor 1 under the pushing of liquid, push the tube expansion head 4 connected with the tubular shell 32 to move towards the deformed part of the sleeve, and enable the tube expansion head 4 to roll the deformed part of the sleeve.

Therefore, the pipe expanding head 4 does not need to be directly pressed down by the operation machine, but the pipe expanding treatment is carried out by utilizing hydraulic pressure, so that the condition that the pressure applied to the deformation part of the sleeve is not large enough and the deformation part is difficult to flatten due to the fact that a large part of the force applied to the deformation part of the sleeve can act on the sleeve of the pipe bending section is avoided.

The working machine continuously pumps liquid into the hydraulic pipe expanding device in the pipe expanding process, but the working machine does not directly control the hydraulic pipe expanding device, so that whether the pipe expanding process is finished or not is difficult to judge on the ground, the time for stopping pumping the liquid cannot be determined, and the pressure relief device is necessary.

Correspondingly, a pressure relief opening 26 is formed in the pipe wall of the tubular valve body 21 corresponding to the first valve body pipe section, a short pipe 27 capable of sliding relative to the tubular valve body 21 is sleeved on the outer wall of the tubular valve body 21 at a position corresponding to the pressure relief opening 26, and the end part, far away from the tube expansion head 4, of the tubular shell 32 is connected with the short pipe 27.

The constant pressure valve 2 is communicated with the sleeve through the pressure relief opening 26, the short pipe 27 is in close contact with the outer wall of the tubular valve body 21, the first end of the tubular shell 32 of the hydraulic cylinder 3 is connected with the short pipe 27, and the second end is connected with the pipe expansion head 4.

In practice, the short pipe 27 completely covers the pressure relief port 26 when the tubular housing 32 of the hydraulic cylinder 3 does not start to slide. After the liquid pushes the tubular housing 32 to start sliding, the tubular housing 32 moves in a direction away from the hydraulic anchor 1, and then the tube expansion head 4 is pushed to roll the deformed part of the casing.

At the same time, the stub 27 slides on the outer wall of the tubular valve body 21, moving with the tubular housing 32 in a direction away from the water anchor 1. After the bursting head 4 passes through the deformed part of the sleeve, the short pipe 27 does not completely cover the pressure relief opening 26 any more, but exposes the pressure relief opening 26. Therefore, liquid in the hydraulic tube expanding device can enter the sleeve from the pressure relief opening 26, the purpose of pressure relief is achieved, and the situation that the hydraulic pressure in the hydraulic tube expanding device is too large and further dangerous is caused is avoided.

In addition, after the pipe expansion head 4 passes through the deformation part of the sleeve, the short pipe 27 is exposed out of the pressure relief opening 26, the inside of the constant pressure valve 2 is communicated with the sleeve, the hydraulic pressure in the hydraulic pipe expansion device can be rapidly reduced, and whether the pipe expansion head 4 passes through the deformation part of the sleeve or not can be judged through a pressure gauge of a pump which is arranged on the operation machine and used for pumping liquid into the hydraulic pipe expansion device, so that the pumping of the liquid is stopped.

Based on above-mentioned structure, hydraulic pressure expand tube device includes hydraulic anchor 1, constant pressure valve 2, pneumatic cylinder 3 and expand the nose 4, and pneumatic cylinder 3 includes tubulose shell 32 and tubbiness inner casing 31. The hydraulic anchor 1, the constant pressure valve 2 and the barrel-shaped inner cylinder 31 are connected in sequence and communicated with each other, and the tubular shell 32 is slidably mounted on the barrel-shaped inner cylinder 31 and connected with the pipe expanding head 4. The tubular housing 32 is driven by hydraulic pressure to push the tube expansion head 4 to move towards the direction far away from the hydraulic anchor 1, so that the tube expansion head 4 can roll the deformed part of the sleeve. Therefore, the pipe expanding head 4 does not need to be directly pressed down by the operation machine, but the pipe expanding treatment is carried out by utilizing hydraulic pressure, so that the condition that the pressure applied to the deformed part of the sleeve is not large enough and the deformed part is difficult to flatten due to the fact that a large part of the force applied to the deformed part of the sleeve can act on the sleeve of the pipe bending section is avoided.

In addition, the ball seat in the constant pressure valve 2, the first telescopic part 24 and the fixing ring 25 enable the hydraulic anchor 1 to be kept fully open before pressure relief, and the hydraulic pipe expanding device is fixed. The pressure relief port 26 arranged on the tubular valve body 21 and the short pipe 27 sleeved on the tubular valve body 21 can prevent the dangerous situation caused by overhigh hydraulic pressure in the hydraulic pipe expanding device. The connection of the short pipe 27, the tubular housing 32 of the hydraulic cylinder 3 and the tube expansion head 4 enables a technician to judge whether the tube expansion head 4 passes through the deformation of the casing pipe according to the hydraulic pressure in the hydraulic tube expansion device, and then stop pumping liquid.

The hydraulic cylinder 3 can drive the tube expanding head 4 and the short tube 27 under the driving of hydraulic pressure, so that hydraulic tube expansion and pressure relief are realized. The concrete structure can be as follows:

the barrel-shaped inner cylinder 31 of the hydraulic cylinder 3 comprises an upper joint 311, a center pipe 312 and a sealing member 313 which are connected in sequence, and the tubular housing 32 of the hydraulic cylinder 3 comprises a first tubular housing 321 and a second tubular housing 322 which are connected.

The upper joint 311 and the central tube 312 are both tubular structures, and the structure of the sealing element 313 may be similar to the tubular ball seat 23 in the constant pressure valve 2, and the sealing element is sealed by a ball, or may be a structure without an opening at the bottom. The first end of the external connecting pipe 5 connected with the first tubular shell 321 is provided with a clamping groove, and the clamping groove structure can be matched with the short pipe 27 sleeved on the constant pressure valve 2, so that the external connecting pipe 5 can drive the short pipe 27 to move.

In an implementation, a first end of the upper joint 311 may be screwed with a second end of the constant pressure valve 2, the second end of the upper joint 311 is located in the central tube 312, an inner wall of the central tube 312 is attached to an outer wall of the upper joint 311, a wall of the central tube 312 is connected to a wall of the upper joint 311 by a screw, and the second end of the central tube 312 is connected to the sealing member 313.

The first end of the first tubular housing 321 is connected with the second end of the outer extension tube 5, the second end of the first tubular housing 321 is connected with the first end of the second tubular housing 322, and the second end of the second tubular housing 322 is connected with the tube expanding head 4.

The outer wall of the first end of the center tube 312 is attached to the inner wall of the first tubular housing 321, with a seal ring disposed therebetween; the inner wall of the second end of the first tubular housing 321 is attached to the outer wall of the center tube 312, and a sealing ring is also disposed therebetween. The first end of the center tube 312 is not attached to the second end of the first tubular housing 321, and the cavity between the two is the sealed cavity 33. The central tube 312 is provided with through holes 34 corresponding to the wall of the sealed cavity 33.

The liquid enters the sealed chamber 33 through the through hole 34, and the first end of the central tube 312 and the second end of the first tubular housing 321 move in opposite directions under the driving of the hydraulic pressure. And the central pipe 312, the upper joint 311, the constant pressure valve 2 and the hydraulic anchor 1 are connected in sequence, so that the position of the central pipe 312 cannot be moved. That is, the second end of the first tubular housing 321 is moved away from the hydraulic anchor 1 under hydraulic drive. External pipe 5, first tubulose shell 321, second tubulose shell 322 and expand tube head 4 and link to each other in proper order, and external pipe 5 can drive nozzle stub 27 and remove to, first tubulose shell 321 can drive nozzle stub 27 and expand tube head 4 and remove, and then realize hydraulic pressure expand tube and pressure release.

In some possible embodiments, in order to increase the thrust of the tubular housing 32 of the hydraulic cylinder 3 on the expansion head 4, the hydraulic cylinder 3 may be of a multistage structure, for example: the number of the center pipes 312 is at least two, and the number of the first tubular housings 321 is at least two. Wherein the number of the center pipes 312 is equal to the number of the first tubular housings 321.

In practice, at least two base pipes 312 are connected end to end, the base pipe 312 near the hydraulic anchor 1 is connected to the upper joint 311, and the base pipe 312 near the bursting head 4 is connected to the sealing member 313. The at least two first tubular shells 321 are connected end to end in sequence, the first tubular shell 321 close to the hydraulic anchor 1 is connected with the short pipe 27 through the external connecting pipe 5, and the first tubular shell 321 close to the tube expansion head 4 is connected with the second tubular shell 322.

A sealed chamber 33 is provided between the second end of each corresponding first tubular housing 321 and the first end of the central tube 312, and each central tube 312 is provided with a through hole 34 in the wall of the corresponding sealed chamber 33. Thus, liquid can enter the corresponding sealed cavities 33 through the at least two through holes 34, the first tubular shell 321 corresponding to each sealed cavity 33 is driven, one tube expansion head 4 is driven, and the pushing force applied to the tube expansion head 4 is increased.

The tube expansion head 4 is used for rolling the deformed part of the sleeve, and the structure of the tube expansion head can be as follows:

optionally, referring to fig. 1 and 4, the tube expanding head 4 includes a connecting tube 41, a mandrel 42, a split head 44, and a fixing cap 45, an annular boss 411 is disposed on an inner wall of the connecting tube 41, and an annular protrusion 421 is disposed at a first end of the mandrel 42.

Wherein, the outer diameter of the annular protrusion 421 is smaller than the inner diameter of the connecting pipe 41 and larger than the inner diameter of the annular boss 411, and the outer diameter of the core shaft 42 is smaller than the inner diameter of the annular boss 411.

In operation, a first end of the connecting tube 41 is connected to a second end of the tubular housing 32. The first end of the mandrel 42 is located between the first end of the connection tube 41 and the annular boss 411, and the second end is located outside the connection tube 41. The fixing cap 45 is fixed to the second end of the core shaft 42, and the split head 44 is sleeved on the core shaft 42 and located between the connecting tube 41 and the fixing cap 45. Thus, the connecting tube 41 and the split head 44 are fixed together by the mandrel 42 and the fixing cap 45, so that the bursting head 4 is referred to as a whole.

During the rolling process of the expansion head 4 on the deformed part of the sleeve, the connecting pipe 41 directly pushes the split head 44. After the tube expansion head 4 passes through the deformed part of the sleeve, in the process of lifting the tube expansion head 4, the annular boss 411 of the connecting tube 41 directly drives the annular protrusion 421 of the mandrel 42, so as to drive the fixing cap 45 fixed with the mandrel 42, and the fixing cap 45 directly drives the tube expansion head 4 to lift.

In some possible embodiments, after the expansion head 4 passes the deformation of the casing, a spring back of the deformation of the casing occurs. In order to avoid the situation that the tube expansion head 4 cannot be lifted up and even the tube expansion head 4 is damaged due to clamping in the process of lifting the tube expansion head 4. Correspondingly, referring to fig. 4, the tube expanding head 4 may further include a second telescopic member 43, and the split head 44 may be a split structure, which can solve the above problem.

Wherein the second telescopic member 43 may be a spring.

In practice, the second telescopic member 43 is mounted on the mandrel 42 and is located between the annular boss 411 of the connection pipe 41 and the annular projection 421 of the mandrel 42. The first end of the split head 44 is located in the connecting tube 41, the second end is located in the fixing cap 45, and the split head 44 is in clearance fit with the mandrel 42. In this way, in the process of lifting the expansion nozzle 4, the second telescopic part 43 is compressed, and can provide a certain supporting force for the annular protrusion 421 of the mandrel 42, and the mandrel 42 drives the split heads 44 through the fixing cap 45, and further, the second telescopic part 43 can indirectly provide an upward pulling force for the split heads 44.

Because the split head 44 is of a split structure, the two parts of the split head 44 are not tightly attached, a gap exists between the two parts, the split head 44 and the mandrel 42 are in clearance fit, and a gap also exists between the split head 44 and the mandrel 42, so that the size of the split head 44 can be changed. If the deformed part of the sleeve rebounds, the two parts of the split heads 44 are stressed to be attached together in the process of lifting the expansion tube head 4, the gap is closed, and the maximum outer diameter of the expansion tube head 4 is reduced. Therefore, the tube expansion head 4 can be smoothly lifted, and the situation that the tube expansion head 4 cannot be lifted by clamping and is even damaged is avoided.

In the embodiment of the present application, the hydraulic pipe expanding device includes a hydraulic anchor 1, a constant pressure valve 2, a hydraulic cylinder 3 and a pipe expanding head 4, and the hydraulic cylinder 3 includes a tubular outer shell 32 and a barrel-shaped inner cylinder 31. The hydraulic anchor 1, the constant pressure valve 2 and the barrel-shaped inner cylinder 31 are sequentially connected and internally communicated, and the tubular shell 32 is slidably mounted on the barrel-shaped inner cylinder 31 and connected with the pipe expanding head 4. The hydraulic pipe expanding device is connected with the operating machine through an oil pipe, a technician pumps liquid into the hydraulic pipe expanding device by using the operating machine, and the tubular shell 32 pushes the pipe expanding head 4 to move towards the direction far away from the hydraulic anchor 1 under the driving of hydraulic pressure, so that the pipe expanding head 4 can roll the deformed part of the sleeve. Therefore, the pipe expanding head 4 does not need to be directly pressed down by the operation machine, but the pipe expanding treatment is carried out by utilizing hydraulic pressure, so that the condition that the pressure applied to the deformed part of the sleeve is not large enough and the deformed part is difficult to flatten due to the fact that a large part of the force applied to the deformed part of the sleeve can act on the sleeve of the pipe bending section is avoided.

Fig. 5 is a flowchart of a method for performing a tube expansion process according to an embodiment of the present application, where the method performs the tube expansion process using the hydraulic tube expansion device. Referring to fig. 5, the method of performing the tube expansion process includes the steps of:

in step 1, the current size of the deformation of the casing in the operating well is obtained.

Specifically, a lead printing method can be adopted, a lead mould is put down into the operation well, and the lead mould is lifted up when the lead mould is blocked. And determining the position of the deformed position of the sleeve and the size of the deformation according to the lowering depth of the lead mould and the size of the mark on the lead mould.

In step 2, a hydraulic expansion device adapted to the current size of the deformation is determined.

Specifically, according to the obtained current size of the deformed position of the casing in the operation well, a pipe expanding head matched with the size of the deformed position is determined, and the hydraulic pipe expanding device is assembled.

In step 3, the hydraulic pipe expanding device installed on the operation machine through the oil pipe is lowered to the deformation position of the casing in the operation well.

Specifically, the assembled hydraulic pipe expanding device is connected with an oil pipe, the oil pipe is connected with an operating machine, and the hydraulic pipe expanding device is lowered to the deformation position of the casing pipe through the operating machine. Therefore, the working machine can put down and lift up the hydraulic pipe expanding device through the oil pipe and feed liquid into the hydraulic pipe expanding device.

And 4, pumping liquid into the hydraulic pipe expansion device through the oil pipe to open a hydraulic anchor of the hydraulic pipe expansion device and fix the hydraulic pipe expansion device in the working well.

And in step 5, continuously pumping liquid into the hydraulic pipe expanding device to roll the deformed part by the hydraulic pipe expanding device.

Optionally, in order to enable the hydraulic pipe expanding device to effectively flatten the deformed position of the sleeve, a pre-tightening force may be applied to the deformed position of the sleeve by the hydraulic pipe expanding device before the liquid is pumped in. Correspondingly, after the step 3 and before the step 4, the method for performing the tube expansion process further comprises the following steps:

and applying a preset pretightening force to the deformed part of the sleeve by the hydraulic pipe expanding device through the operation machine.

The preset pretightening force can be determined according to the size of the deformation position of the sleeve and the performance of the working machine, and for example, the preset pretightening force can be 2T.

In implementation, after the hydraulic pipe expanding device is lowered to the deformation position of the casing, the operation machine can be controlled to apply pressure to the oil pipe, so that the hydraulic pipe expanding device connected with the oil pipe can apply pretightening force to the deformation position of the casing, and then liquid is pumped into the hydraulic pipe expanding device to be fixed in an operation well. Therefore, the applied pretightening force can enable the total pressure applied to the deformed part of the sleeve by the hydraulic pipe expanding device to be larger, and the flattened deformed part of the sleeve is facilitated.

And 6, when the reduction value of the hydraulic pressure in the hydraulic pipe expansion device within the preset time length is detected to be larger than or equal to the pressure drop threshold value, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the operation machine to take the hydraulic pipe expansion device out of the operation well.

And the reduction value of the hydraulic pressure in the hydraulic pipe expanding device within the preset time length is greater than or equal to the pressure drop threshold value, and the hydraulic pressure in the hydraulic pipe expanding device is represented to be suddenly reduced. Therefore, the values of the preset duration and the pressure drop threshold can be determined according to the specific conditions of the construction site. For example, the preset time period may be 5 seconds, and the pressure drop threshold may be two-thirds of the maximum value of the hydraulic pressure.

In implementation, the reduction value of the hydraulic pressure in the hydraulic pipe expanding device within the preset time period is greater than or equal to the pressure drop threshold value, and represents that the hydraulic pressure in the hydraulic pipe expanding device is suddenly reduced. And the hydraulic pressure in the hydraulic pipe expansion device is suddenly reduced, which means that the liquid in the hydraulic pipe expansion device enters the sleeve, and the pressure relief opening is opened. That is, the hydraulic pressure in the hydraulic expansion device drops suddenly, indicating that the expansion head has passed the deformation of the casing, at which point the pumping of fluid into the hydraulic expansion device may be stopped and the work machine controlled to remove the hydraulic expansion device from the well.

In some possible embodiments, it may also be determined by other conditions whether the bursting head has passed the deformation of the sleeve. For example: and if the amount of the pumped liquid is detected to be larger than the maximum volume sum of the oil pipe and the hydraulic pipe expansion device which are lowered into the working well, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the working machine to take the hydraulic pipe expansion device out of the working well.

In practice, if it is detected that the amount of liquid pumped is greater than the sum of the maximum volumes of tubing and the hydraulic expansion device lowered into the well, it is indicated that a portion of the pumped liquid has begun to enter the casing. That is, the above situation represents that the pressure relief port of the hydraulic expansion device has opened, i.e. the expansion head has passed the deformation of the casing.

Optionally, in order to ensure that the deformed portion of the sleeve does not bounce, step 6 may include:

and when the reduction value of the hydraulic pressure in the hydraulic pipe expansion device within the preset time is detected to be larger than the pressure drop threshold value, stopping pumping the liquid into the hydraulic pipe expansion device, controlling the operation machine to lift and lower the hydraulic pipe expansion device at the deformed position, and when the lifting and lowering times reach the target times, controlling the operation machine to take the hydraulic pipe expansion device out of the operation well.

Wherein, the target times can be determined according to whether the hydraulic pipe expanding device is blocked when being lifted up. When the hydraulic pipe expanding device is lifted up, the hydraulic pipe expanding device is not blocked any more, or the resistance can be ignored, the number of times of lifting up and lowering down is the target number of times.

Like this, through lifting and transferring hydraulic pressure expand tube device in the department that warp, make hydraulic pressure expand tube device roll the department that warp of sleeve pipe many times, avoided the deformation department of sleeve pipe to take place the condition of bounce-back and take place.

Optionally, in order to observe hydraulic pressure changes in the hydraulic pipe expansion device in time and ensure construction safety, step 6 may specifically include:

and according to the period that the pumping time length of the liquid is the target time length when the hydraulic pressure in the hydraulic pipe expanding device rises to the target pressure value, pumping the liquid into the hydraulic pipe expanding device. And when the reduction value of the hydraulic pressure in the hydraulic pipe expanding device within the preset time is detected to be greater than or equal to the pressure drop threshold value, stopping pumping the liquid into the hydraulic pipe expanding device, and controlling the operation machine to take the hydraulic pipe expanding device out of the operation well.

The target pressure value and the target duration can be determined according to the specific requirements of the construction site. For example: the target pressure value may be 5MPa and the target time period may be 1 minute. In addition, the predetermined time period and the pressure drop threshold are determined according to the same descriptions as those described above, and are not described herein again.

In the implementation, in order to avoid the situation that the hydraulic pressure change in the hydraulic device cannot be observed in time, the pumping of the liquid can be stopped for 1 minute after the hydraulic pressure rises by 5MPa, and the observation is carried out, so that the construction safety is also ensured. During the expansion column process, the hydraulic pressure is generally rising, but in some cases fluctuations may occur, resulting in a temporary drop in hydraulic pressure. If the reduction value of the hydraulic pressure within the preset time is smaller than the pressure drop threshold value, the pressure drop is short fluctuation, the pipe expansion head does not pass through the deformation part of the sleeve, the pipe expansion treatment is not finished, and the liquid is continuously pumped into the hydraulic pipe expansion device. If the reduction value of the hydraulic pressure within the preset time is greater than or equal to the pressure drop threshold value, which represents that the pipe expansion head passes through the deformation part of the sleeve, the pumping of the liquid into the hydraulic pipe expansion device can be stopped at the moment, and the operation machine is controlled to take the hydraulic pipe expansion device out of the operation well.

When the size of the deformed part of the sleeve is large, the deformed part of the sleeve is difficult to flatten by using one tube expansion head for one-time tube expansion treatment, and the size of the tube expansion head needs to be increased from small to large for multiple times of tube expansion treatment.

Optionally, after step 6, the method for performing tube expansion further includes:

if the current size of the deformed position of the casing in the operation well meets the preset condition, ending the pipe expansion processing of the casing in the operation well; and (3) if the current size of the deformed part of the casing in the operation well is detected not to meet the preset condition, turning to the step 1 to continue to execute the casing expansion treatment on the casing in the operation well.

The preset condition is a size condition capable of meeting normal operation of the underground operation machine tool, and can be determined according to construction requirements.

In the implementation, if the size of the deformed part of the sleeve is still larger after the primary pipe expansion treatment, which can affect the normal use of the downhole operation machine, the pipe expansion head with larger size is replaced, and the secondary pipe expansion treatment is performed, so that the effect of the pipe expansion treatment can meet the construction requirement.

In this application embodiment, hydraulic pressure expand tube device includes hydraulic anchor, constant pressure valve, pneumatic cylinder and expand tube head, and the pneumatic cylinder includes tubulose shell and tubbiness inner cylinder. The hydraulic anchor, the constant pressure valve and the barrel-shaped inner cylinder are sequentially connected and are internally communicated, and the tubular shell is slidably mounted on the barrel-shaped inner cylinder and is connected with the pipe expanding head. The hydraulic pipe expanding device is connected with the operating machine through an oil pipe, a technician pumps liquid into the hydraulic pipe expanding device by using the operating machine, and the tubular shell pushes the pipe expanding head to move towards the direction far away from the hydraulic anchor under the driving of hydraulic pressure, so that the pipe expanding head can roll the deformed part of the sleeve. Therefore, the pipe expanding head does not need to be directly pressed down by the operation machine, but the pipe expanding treatment is carried out by utilizing hydraulic pressure, so that the condition that the pressure applied to the deformation part of the sleeve is not large enough and the deformation part is difficult to flatten due to the fact that a large part of the force applied to the deformation part of the sleeve can act on the sleeve of the pipe bending section is avoided.

The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims (10)

1. The utility model provides a hydraulic pressure expand tube device, a serial communication port, hydraulic pressure expand tube device includes hydraulic anchor (1), constant pressure valve (2), pneumatic cylinder (3) and bloated tube head (4), constant pressure valve (2) are including tubulose valve body (21) (21), spheroid (22), tubulose ball seat (23), first extensible member (24) and solid fixed ring (25), pneumatic cylinder (3) are including tubbiness inner casing (31) and tubulose shell (32), wherein:

the hydraulic anchor (1), the constant pressure valve (2), the hydraulic cylinder (3) and the tube expansion head (4) are sequentially connected, the barrel-shaped inner cylinder (31) is fixed on the constant pressure valve (2), the tube expansion head (4) is fixed on the tubular shell (32), the first end of the hydraulic anchor (1) is fixed on an oil pipe, and the oil pipe, the hydraulic anchor (1), the constant pressure valve (2) and the barrel-shaped inner cylinder (31) are communicated;

a ball limiting structure (233) is installed in a first ball seat pipe section (231) of the tubular ball seat (23), the ball (22) is located between the ball limiting structure (233) and a second ball seat pipe section (232) of the tubular ball seat (23), the tubular ball seat (23) is slidably installed in the tubular valve body (21), the fixing ring (25) is installed in the second valve body pipe section of the tubular valve body (21), the first telescopic piece (24) is located between the tubular ball seat (23) and the fixing ring (25), when a first end of the tubular ball seat (23) extends into the first valve body pipe section of the tubular ball seat (23), the outer wall of the tubular ball seat (23) is attached to the inner wall of the first valve body pipe section, and a space is reserved between the outer wall of the tubular ball seat (23) and the inner wall of the second valve body pipe section;

the tubular outer shell (32) is slidably mounted on the barrel-shaped inner cylinder (31), a sealed cavity (33) is arranged between the barrel-shaped inner cylinder (31) and the tubular outer shell (32), a through hole (34) is arranged on the cylinder wall of the barrel-shaped inner cylinder (31) at a position corresponding to the sealed cavity (33), when liquid is input to the hydraulic pipe expanding device through the oil pipe, the liquid in the barrel-shaped inner cylinder (31) enters the sealed cavity (33) through the through hole (34), and the tubular outer shell (32) is pushed to slide relative to the barrel-shaped inner cylinder (31);

tubular valve body (21) correspond be provided with pressure release mouth (26) on the pipe wall of first valve body pipeline section, correspond on the outer wall of tubular valve body (21) the position department of pressure release mouth (26), the cover be equipped with for the gliding nozzle stub (27) of tubular valve body (21), the first end of tubular shell (32) with nozzle stub (27) link to each other, work as tubular shell (32) for when tubbiness inner casing (31) slide, drive nozzle stub (27) for tubular valve body (21) slide, so that liquid in tubular valve body (21) is followed flow out in pressure release mouth (26).

2. A hydraulic tube expansion device according to claim 1, characterized in that the barrel-shaped inner cylinder (31) of the hydraulic cylinder (3) comprises an upper joint (311), a central tube (312) and a sealing element (313) connected in sequence, the tubular housing (32) of the hydraulic cylinder (3) comprises a first tubular housing (321) and a second tubular housing (322) connected, the first tubular housing (321) being connected to the stub tube (27) by means of an extension tube (5), wherein:

the upper joint (311) and the central pipe (312) are both of tubular structures, the first end of the upper joint (311) is in threaded connection with the second end of the constant pressure valve (2), the second end of the upper joint (311) is located in the central pipe (312), the inner wall of the central pipe (312) is attached to the outer wall of the upper joint (311), the pipe wall of the central pipe (312) is connected with the pipe wall of the upper joint (311) through screws, and the second end of the central pipe (312) is connected with the sealing element (313);

the first end of first tubular shell (321) with the second end of outer takeover (5) links to each other, the first end of outer takeover (5) is equipped with the draw-in groove, outer takeover (5) pass through the draw-in groove with nozzle stub (27) link to each other, the second end of first tubular shell (321) with the first end of second tubular shell (322) links to each other, the second end of second tubular shell (322) with tube expansion head (4) link to each other, the outer wall of the first end of center tube (312) with the inner wall of first tubular shell (321) laminates mutually, the inner wall of the second end of first tubular shell (321) with the outer wall of center tube (312) laminates mutually, the outer wall of the first end of center tube (312) with the inner wall of first tubular shell (321), and be provided with the sealing washer between the inner wall of the second end of first tubular shell (321) with the outer wall of center tube (312), sealed chamber (33) be the first end of center tube (312) with the cavity between the first end of first tubular shell (321).

3. A hydraulic tube expansion device according to claim 2, characterized in that the number of the central tubes (312) is at least two, the number of the first tubular housings (321) is at least two, the number of the central tubes (312) is equal to the number of the first tubular housings (321), wherein:

the at least two central pipes (312) are connected end to end in sequence, the central pipe (312) close to the hydraulic anchor (1) is connected with the upper joint (311), and the central pipe (312) close to the tube expansion head (4) is connected with the sealing element (313);

the end to end of at least two first tubular shells (321) are connected in sequence, the first tubular shell (321) close to the hydraulic anchor (1) is connected with the short pipe (27) through the external connecting pipe (5), and the first tubular shell (321) close to the tube expansion head (4) is connected with the second tubular shell (322).

4. The hydraulic tube expansion device according to claim 1, characterized in that the tube expansion head (4) comprises a connection tube (41), a mandrel (42), a split head (44) and a fixing cap (45), wherein:

an annular boss (411) is arranged on the inner wall of the connecting pipe (41), an annular bulge (421) is arranged at the first end of the mandrel (42), the outer diameter of the annular bulge (421) is smaller than the inner diameter of the connecting pipe (41) and larger than the inner diameter of the annular boss (411), and the outer diameter of the mandrel (42) is smaller than the inner diameter of the annular boss (411);

the first end of connecting pipe (41) with the second end of tubulose shell (32) is connected, dabber (42) are located in connecting pipe (41), locking cap (45) with the second end of dabber (42) is fixed mutually, branch lamella head (44) cover is established on dabber (42), and is located connecting pipe (41) with between locking cap (45).

5. The hydraulic tube expansion device according to claim 4, wherein the tube expansion head (4) further comprises a second expansion member (43), the second expansion member (43) is installed on the mandrel (42) and located between the annular boss (411) and the annular protrusion (421), the split head (44) is of a split structure, a first end of the split head (44) is located in the connecting tube (41), a second end of the split head (44) is located in the fixing cap (45), and the split head (44) is in clearance fit with the mandrel (42).

6. A method of performing a tube expansion process using the hydraulic tube expansion device according to any one of claims 1 to 5, the method comprising:

acquiring the current size of a deformed part of a casing in an operation well;

determining a hydraulic pipe expanding device matched with the current size of the deformation part;

the hydraulic pipe expanding device which is arranged on the operation machine through an oil pipe is lowered to the deformation position of the casing pipe in the operation well;

pumping liquid into the hydraulic pipe expansion device through the oil pipe, expanding a hydraulic anchor of the hydraulic pipe expansion device, and fixing the hydraulic pipe expansion device in the operating well;

continuously pumping liquid into the hydraulic pipe expanding device to roll the deformed part by the hydraulic pipe expanding device;

and when the decrease value of the hydraulic pressure in the hydraulic pipe expansion device within the preset time is detected to be larger than or equal to the pressure drop threshold value, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the operation machine to take the hydraulic pipe expansion device out of the operation well.

7. The method of claim 6, wherein stopping pumping fluid into the hydraulic expansion device and controlling the work machine to remove the hydraulic expansion device from the work well comprises:

according to the period that the time length of stopping pumping the liquid is the target time length when the hydraulic pressure rises to the target pressure value, pumping the liquid into the hydraulic pipe expanding device;

and when the decrease value of the hydraulic pressure in the hydraulic pipe expansion device within the preset time is detected to be larger than or equal to the pressure drop threshold value, stopping pumping the liquid into the hydraulic pipe expansion device, and controlling the operation machine to take the hydraulic pipe expansion device out of the operation well.

8. The method for performing a pipe expansion process according to claim 6, wherein the step of stopping pumping of the hydraulic expansion device when the hydraulic pressure in the hydraulic expansion device is detected to be reduced for a preset time period to be greater than or equal to a pressure drop threshold value and controlling the operation machine to take the hydraulic expansion device out of the operation well comprises the steps of:

when the reduction value of the hydraulic pressure in the hydraulic pipe expanding device within a preset time is detected to be larger than a pressure drop threshold value, stopping pumping the liquid into the hydraulic pipe expanding device, and controlling the operation machine to lift and lower the hydraulic pipe expanding device at the deformation position;

and when the times of lifting and lowering reach the target times, controlling the operating machine to take the hydraulic pipe expanding device out of the operating well.

9. The method for performing pipe expansion according to claim 6, wherein after the pump of the liquid into the hydraulic pipe expansion device is stopped and the working machine is controlled to remove the hydraulic pipe expansion device from the working well after the decrease of the hydraulic pressure in the hydraulic pipe expansion device within the preset time period is detected to be greater than or equal to the pressure drop threshold value, the method for performing pipe expansion further comprises:

if the current size of the deformed position of the casing in the operation well meets the preset condition, ending the pipe expansion processing of the casing in the operation well;

and if the current size of the deformed position of the casing in the operation well is detected not to meet the preset condition, turning to the step of obtaining the current size of the deformed position of the casing in the operation well, and continuing to perform the pipe expanding treatment on the casing in the operation well.

10. A method of performing a pipe expansion process according to claim 6, wherein said determining a hydraulic expansion device adapted to the current size of the deformation comprises:

and determining an expansion head of the hydraulic expansion device matched with the size of the deformation position.

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