CN111119786B

CN111119786B - Packer, setting tool and drilling and completion integrated method

Info

Publication number: CN111119786B
Application number: CN201811293653.8A
Authority: CN
Inventors: 岳慧
Original assignee: China Petroleum and Chemical Corp; Sinopec Research Institute of Petroleum Engineering
Current assignee: China Petroleum and Chemical Corp; Sinopec Research Institute of Petroleum Engineering
Priority date: 2018-11-01
Filing date: 2018-11-01
Publication date: 2021-09-10
Anticipated expiration: 2038-11-01
Also published as: CN111119786A

Abstract

The invention provides a packer, a setting tool and a drilling and completion integrated method, wherein the packer comprises a cylindrical upper joint, a cylindrical lower joint, an outer sleeve for connecting the upper joint and the lower joint, a rubber sleeve part with the upper end fixedly connected with the upper joint, the rubber sleeve part is positioned in an inner cavity of the outer sleeve, and an inner sleeve for limiting the lower end of the rubber sleeve part, the upper end of the inner sleeve is selectively and fixedly connected with the upper joint, and the lower end of the inner sleeve extends in the inner cavity of the outer sleeve beyond the rubber sleeve part, wherein a first clamping and hanging part is arranged on the inner wall of the inner sleeve, the packer is pre-installed on a sleeve, and when needed, the setting tool installed on a drill rod is used for opening.

Description

Packer, setting tool and drilling and completion integrated method

Technical Field

The invention relates to the technical field of petroleum and natural gas, in particular to a packer, a setting tool and a drilling and completion integrated method.

Background

With the development of the integrated drilling and completion process, after drilling is completed, the lower drill pipe is separated from the upper drill pipe, and the lower drill pipe may be placed downhole as a lower completion string. In the actual construction operation process, when a gas reservoir is drilled, once gas invasion is found, an annular space between a drill rod and a casing pipe needs to be sealed, so that operations such as releasing and the like are performed.

However, the packers of the prior art are not suitable for integrated drilling and completion processes.

Disclosure of Invention

In view of some or all of the above technical problems in the prior art, the present invention provides an integrated packer, setting tool and drilling and completion method. This packer installs in advance on the sleeve pipe, when needs, is opened by the setting instrument of installing on the drilling rod, realizes setting to seal the annular space between drilling rod and the sleeve pipe, in order to carry out operations such as giving up.

According to a first aspect of the invention, a packer is proposed, comprising:

a cylindrical upper joint, a cylindrical lower joint and a cylindrical upper joint,

a cylindrical lower joint is arranged at the lower end of the cylinder,

a jacket for connecting the upper joint and the lower joint,

a rubber cylinder part with the upper end fixedly connected with the upper joint, the rubber cylinder part is positioned in the inner cavity of the outer sleeve,

an inner sleeve for limiting the lower end of the rubber cylinder part, the upper end of the inner sleeve is selectively and fixedly connected with the upper joint, the lower end of the inner sleeve extends in the inner cavity of the outer sleeve beyond the rubber cylinder part,

wherein, set up first card portion of hanging on the inner wall of inner tube.

In one embodiment, the first hooking portion is configured as a groove provided on an inner wall of the inner sleeve.

In one embodiment, the rubber sleeve component comprises a fixed section, a connecting section and a sealing section which are sequentially connected from top to bottom, the fixed section is embedded between the upper joint and the outer sleeve, and the connecting section and the sealing section are rebounded inwards in the radial direction after the limitation of the inner sleeve is removed so that the sealing section extends in the axial direction.

In one embodiment, an installation groove is formed on the outer wall of the upper connector, and a protruding strip which is in concave-convex fit with the installation groove is arranged on the fixing section.

In one embodiment, a circumferentially encircling projecting ring is provided on the inner side of the sealing section

According to a second aspect of the present invention, there is provided a setting tool comprising:

a central tube,

an elastic claw component sleeved on the outer wall of the central tube, wherein the elastic claw component is provided with an elastic claw and a second clamping and hanging part which is arranged at the outer side of the upper end of the elastic claw and can be matched with the first clamping and hanging part,

a sliding sleeve which is sleeved outside the elastic claw component and is used for limiting the elastic claw,

and the driving component is used for driving the sliding sleeve to move downwards.

In one embodiment, the drive assembly has:

a sealing space formed by the outer wall of the central tube, the lower end surface of the elastic claw component and an inner step surface arranged on the inner wall of the sliding sleeve,

the open end of the pressure transmission rod penetrates through the central pipe in a sealed mode and extends into the sealed space.

In one embodiment, a first shear pin is disposed between the sliding sleeve and the resilient finger assembly.

In one embodiment, the second catching portion is configured in a wedge shape protrudingly provided on the elastic claw, and a thickness of the second catching portion gradually increases in an upper-to-lower direction.

According to a third aspect of the invention, there is provided an integrated method of drilling and completing a well, comprising pre-setting the packer as described above on casing, and then installing the setting tool as described above on the drill pipe, the setting tool being operable to actuate the packer setting when packer setting is required.

The advantage of the invention over the prior art is that the packer is pre-installed on the casing during the drilling completion and is opened by a setting tool installed on the drill pipe when required. The packer and the setting tool are separated, so that respective structures are simplified, and the reliability is improved. Meanwhile, the packer is put in advance, and subsequent well cementation and logging operations are not influenced.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 shows a packer according to one embodiment of the invention;

FIG. 2 shows a setting tool according to one embodiment of the invention;

FIG. 3 illustrates a resilient finger assembly according to one embodiment of the present invention;

FIG. 4 shows a schematic of a packer set condition;

in the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

The invention will be further explained with reference to the drawings.

FIG. 1 shows a packer 100 according to the present invention. As shown in fig. 1, the packer 100 includes an upper joint 1, a lower joint 7, an outer casing 6, a packing element 4, and an inner casing 5. Wherein, the upper joint 1 is cylindrical and is used for being connected with a sleeve. The lower joint 7 is likewise cylindrical for connection with a casing. An outer sleeve 6 is provided between the upper joint 1 and the lower joint 7 for connecting the two. The upper end of the rubber cylinder part 4 is fixedly connected with the upper joint 1, and the lower end extends in the inner cavity of the outer sleeve 6. After the packer 100 is set, the packing element 4 can seal off the annulus between the casing and the drillpipe. The upper end of the inner sleeve 5 is selectively and fixedly connected with the upper joint 1. The lower end of the inner sleeve 5 extends beyond the rubber cylinder 4 in the inner cavity of the outer sleeve 6 for limiting the rubber cylinder 4. A first hooking portion 51 is provided on the inner wall of the inner sleeve 5 for cooperating with a setting tool 200 that is set in.

The upper and lower subs 1 and 7 of the packer 100 are each connected to casing and run into the wellbore ahead of time with the casing. In an initial state, the inner drift diameter of the packer 100 is the same as that of the casing, so that the packer 100 which is put in advance does not influence subsequent operation operations such as well cementation, well logging and the like. For convenient connection, the upper joint 1 and the lower joint 7 are respectively fixed with the casing pipe through screw threads.

Preferably, the first hooking portion 51 is configured as a groove provided on the inner wall of the inner case 5. The groove may form a male-female fit with a second catch 91 provided on the setting tool 200, thereby stably confining the setting tool 200 to the inner wall of the packer 100, as shown in fig. 4. The first engaging portion 51 and the second engaging portion 91 are relatively stable in such an engaging manner, and unique engagement can be achieved.

According to the present invention, as shown in fig. 4, the rubber tube 4 includes a fixing section 41, a connecting section 42 and a sealing section 43 connected in this order in the top-to-bottom direction.

Preferably, the fixing section 41 is embedded between the upper joint 1 and the outer jacket 6 to define the position of the rubber cylinder 4. It is further preferable that the mounting groove 11 is provided on the upper joint 1, and at the same time, a protruding strip 44 is provided on the fixing section 41, and the protruding strip 44 forms a concave-convex fit with the mounting groove 11 to increase the stability of the fixing rubber cylinder member 4. Still further preferably, the mounting groove 11 is constructed with a trapezoidal axial section and with a reduced mouth on the outside. That is, the two groove walls of the mounting groove 11 are closer and closer in the inside-to-outside direction. When not assembled, the height of the protruding strip 44 is greater than the groove depth of the mounting groove 11. And the protruding strip 44 is press-deformed to be inserted into the mounting groove 11 during the mounting process. The above structure ensures stable connection of the fixing section 41 to the upper joint 1.

The connecting section 42 serves for connection and resilience. In the initial state, the connection section 42 is defined between the inner case 5 and the outer case 6 by the inner case 5, as shown in fig. 1. After the inner sleeve 5 is moved down and the rubber sleeve member 4 is removed, the connecting section 42 springs back radially inward, pushing the sealing section 43 into sealing engagement with the center tube 8, as shown in fig. 4. In order to ensure the support of the sealing section 43, the thickness of the connecting section 42 is greater than that of the fixing section 41.

The sealing section 43 mainly functions as a seal, and in an initial state, the sealing section 43 is defined between the inner sleeve 5 and the outer sleeve 6 by the inner sleeve 5, as shown in fig. 1. After the inner sleeve 5 is removed from the rubber sleeve 4, the sealing section 43 springs back radially inward following the connecting section 42, and the sealing section 43 extends axially to contact the central tube 8, thereby producing a sealing effect. The sealing element 4 arranged in this way is simple in structure and simple and convenient in setting operation.

Preferably, a circumferentially encircling protruding ring (not shown in the figures) is provided on the inside of the sealing section 43. In the process that the sealing section 43 is abutted to the central pipe 8, the protruding ring is compressed, and the effect of enhancing the sealing is achieved. Further preferably, in the axial direction, a plurality of protruding rings can be arranged at intervals to further increase the sealing effect and play a role of multiple sealing.

As shown in fig. 1, the inner sleeve 5 is connected to the upper joint 1 by the second shear pin 2, thereby achieving a selectively fixed connection. In the initial state, the inner sleeve 5 is fixed to the upper joint 1 by the second shear pin 2. At this time, the rubber sleeve 4 is defined. When setting is needed, the pressure acts to shear the second shear pin 2, so that the upper joint 1 is released from limiting the inner sleeve 5. At this time, the inner sleeve 5 can move down and the restriction of the rubber tube member 4 is released.

The upper end and the lower end of the outer sleeve 6 are respectively sleeved on part of the outer walls of the upper joint 1 and the lower joint 7 for connection. In addition, the outer sleeve 6 plays a role in protecting the rubber cylinder part 4, and prevents the rubber cylinder part 4 from being worn or scratched in the process of being put in, so that a good sealing effect is ensured. This arrangement also enables the upper end face of the lower joint 7 to receive the inner sleeve 5. That is, during the downward movement of the inner sleeve 5, it can be seated on the upper end surface of the lower joint 7.

The present application also relates to a setting tool 200. As shown in fig. 2, the setting tool 200 comprises a central tube 8, a resilient jaw assembly 9, a sliding sleeve 10 and a drive assembly. Wherein the central tube 8 serves as a connection and support, the upper end of which is intended for connection with the coiled tubing of the drill string. The elastic claw assembly 9 is sleeved on the outer wall of the central tube 8. As shown in fig. 3, the elastic claw assembly 9 has a body 92, an elastic claw 90, and a second hooking portion 91 provided on the outer side of the elastic claw 90. The second hooking portion 91 is adapted to cooperate with the first hooking portion 51 to achieve hooking. In the initial state, the sliding sleeve 10 is sleeved outside the elastic claw assembly 9 for limiting the elastic claws 90 from expanding radially outwards. In the event that packing is required, the drive assembly actuates the sliding sleeve 10 to move downward, thereby releasing the elastic claw 90 from its definition to ensure that the elastic claw 90 expands and the second catching portion 91 engages with the first catching portion 51.

As shown in fig. 3, the body 92 of the elastic claw assembly 9 is cylindrical. The resilient fingers 90 are configured as a plurality of circumferentially spaced resilient tabs that extend upwardly from the body 92. In the natural state, the resilient fingers 90 expand radially outward relative to the body 92. In the initial state, the sliding sleeve 10 causes the elastic claws 90 to radially collapse, thereby performing a limiting function.

In one embodiment, as shown in FIG. 2, the drive assembly includes a sealed space 14 and a transfer rod 12. Wherein the sealed space 14 is formed by the outer wall of the central tube 8, the lower end surface of the elastic claw assembly 9 and the inner step 101 surface arranged on the inner wall of the sliding sleeve 10. And the pressure transmission rod 12 is configured in a tubular shape with one end blocked. The open end of the pressure transmission rod 12 extends sealingly through the central tube 8 into the sealed space 14. After the rubber plug is delivered into the inner cavity of the central tube 8, the pressure transmission rod 12 is cut off to communicate the inner cavity of the central tube 8 with the sealed space 14. At the moment, liquid is pumped into the inner cavity of the central tube 8, and the liquid enters the sealed space 14 through the pressure transmission rod 12 because the rubber plug blocks the inner cavity at the lower end of the central tube 8. Under the action of hydraulic pressure, the sliding sleeve 10 moves downwards relative to the central tube 8, thereby releasing the restriction of the elastic claw assembly 9.

The sliding sleeve 10 can be sleeved on the outer wall of the elastic claw assembly 9 under the elastic force of the elastic claw assembly 9 without moving downwards. However, in order to increase the stability of the sliding sleeve 10 and prevent the elastic jaw assembly 9 from being sprung open in advance due to the early downward movement of the sliding sleeve 10 due to gravity, a first shear pin 15 is provided between the sliding sleeve 10 and the elastic jaw assembly 9. During operation of the drive assembly, the first shear pin 15 is sheared and does not prevent the sliding sleeve 10 from moving downward.

The second catching portion 91 is configured in a protruding wedge shape, and the thickness of the second catching portion 91 is gradually increased in the top-to-bottom direction. In the initial state, the second hooking portion 91 extends out of the inner cavity of the sliding sleeve 10. When the sealing is needed, the second hanging part 91 enters the first hanging part 51 in the process of moving the setting tool 200 downwards, so that concave-convex clamping is formed.

The drilling and completion integration method is described in detail below with reference to fig. 1 to 4.

Corresponding to a gas well, in particular a high-pressure (not less than 35MPa) gas well, even an ultra-deep (more than 5000m) and ultra-high pressure (not less than 70MPa) fracture-cavity type gas reservoir, the packer 100 is previously lowered into the well along with a casing string at the previous opening time of drilling the gas reservoir, and is well-fixed. Because the inner drift diameter of the packer 100 is the same as the inner diameter of the casing string, the operations of well cementation, well logging and the like are not influenced, and the next drilling operation is not influenced.

When drilling out a gas reservoir, the drill string is drilled with the setting tool 200. The setting tool 200 of the above structure can transmit drilling torque well without affecting normal drilling. Once gas invasion is discovered during drilling, the setting tool 200 may be raised above the pre-set packer 100. Then, a rubber plug is put into the drill string, and the pressure transmission rod 12 is cut off in the downward process of the rubber plug, so that the inner cavity of the central pipe 8 is communicated with the sealed space 14. Liquid is pumped into the inner cavity of the central tube 8, and the liquid enters the sealed space 14 through the pressure transmission rod 12 because the rubber plug blocks the inner cavity at the lower end of the central tube 8. Under the action of hydraulic pressure, the sliding sleeve 10 moves downwards relative to the central tube 8, and the elastic claws 90 are released. Under its own resilience, the resilient fingers 90 spring radially outwardly. Next, the drill string is lowered, and the second retaining portion 91 is retained on the first retaining portion 51. Then, downward pressure is applied through the drill string, shearing off the second shear pin 2. At the same time, the downward force causes the inner sleeve 5 to move downward and eventually release the confinement of the rubber barrel member 4. The connecting section 42 and the sealing section 43 of the rubber cylinder 4 are rebounded radially inwards under the action of the elasticity of the rubber cylinder 4 to seal the annular space between the central pipe 8 and the outer sleeve 6.

Through the above operation, the packer 100 seals off the annulus between the drill string and the casing, thereby contributing to the gas-invasion prevention function and ensuring the well control safety.

In the present application, the orientation terms "upper" and "lower" are used with reference to the actual operating orientation of the packer 100.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily make changes or variations within the technical scope of the present invention disclosed, and such changes or variations should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A packer, comprising:

a cylindrical lower joint is arranged at the lower end of the cylinder,

a jacket for connecting the upper joint and the lower joint,

an inner sleeve for defining a lower end of the rubber barrel member, an upper end of the inner sleeve being selectively fixedly connected with the upper joint, a lower end of the inner sleeve extending in an inner cavity of the outer sleeve beyond the rubber barrel member,

wherein, set up the first card on the inner wall of endotheca and hang the portion.

2. The packer of claim 1, wherein the first catch portion is configured as a groove disposed on an inner wall of the inner sleeve.

3. The packer of claim 1 or 2, wherein the rubber sleeve member comprises a fixed section, a connecting section and a sealing section which are connected in sequence from top to bottom, the fixed section is embedded between the upper joint and the outer sleeve, and the connecting section and the sealing section are rebounded inwards in a radial direction after the limitation of the inner sleeve is removed so that the sealing section extends axially.

4. A packer as claimed in claim 3, wherein an installation groove is provided on an outer wall of the upper joint, and a protruding strip which forms a concave-convex fit with the installation groove is provided on the fixing section.

5. A packer as claimed in claim 3, wherein a circumferentially surrounding projecting ring is provided on the inside of the sealing section.

6. A setting tool that cooperates with the packer of any of claims 1 to 5, comprising:

a central tube,

an elastic claw component sleeved on the outer wall of the central tube, wherein the elastic claw component is provided with an elastic claw and a second clamping and hanging part which is arranged on the outer side of the upper end of the elastic claw and can be matched with the first clamping and hanging part,

a sliding sleeve sleeved on the outer side of the elastic claw component and used for limiting the elastic claw,

and the driving assembly is used for driving the sliding sleeve to move downwards.

7. The setting tool of claim 6, wherein the drive assembly has:

a sealing space formed by the outer wall of the central pipe, the lower end surface of the elastic claw component and an inner step surface arranged on the inner wall of the sliding sleeve,

and the open end of the pressure transmission rod hermetically penetrates through the central pipe and extends into the sealed space.

8. The setting tool according to claim 6 or 7, wherein a first shear pin is provided between the sliding sleeve and the resilient jaw assembly.

9. The setting tool of claim 6 or 7, wherein the second catching portion is configured as a wedge shape protrudingly provided on the elastic claw, and a thickness of the second catching portion gradually increases in an upper-to-lower direction.

10. A method of integrating drilling and completion comprising pre-setting a packer according to any of claims 1 to 5 on a casing and then installing a setting tool according to any of claims 6 to 9 on a drill pipe, the setting tool being operable to actuate the packer to set when setting of the packer is required.