CN113513288A

CN113513288A - Packer bypass mechanism

Info

Publication number: CN113513288A
Application number: CN202110498253.6A
Authority: CN
Inventors: 魏军; 周超杰; 张黎明; 徐乾程; 马静
Original assignee: YANGZHOU CHICHENG PETROLEUM MACHINERY CO Ltd
Current assignee: YANGZHOU CHICHENG PETROLEUM MACHINERY CO Ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2021-10-19

Abstract

The invention relates to a packer bypass mechanism, which comprises an upper joint, a bypass joint, a balance piston, a bypass outer cylinder and a sealing seat, wherein the upper joint is fixedly connected with the upper joint; the lower end of the bypass joint is connected with an upper mandrel of the packer, the upper end of the bypass joint is connected with an upper joint, and a side hole is formed in the bypass joint; the bypass outer barrel is sleeved on the outer ring of the bypass connector, and a bypass hole is formed in the bypass outer barrel; the lower end of the bypass outer barrel is connected with the sealing seat, and the sealing seat is arranged at the upper end of the anchor tile barrel; and a balance piston is arranged between the bypass outer barrel and the bypass joint and sleeved on the upper part of the bypass joint. The bypass mechanism is matched with the packer for use, so that the packer is easy to unseal, the unsealing force is small, and the pipe column can be unsealed by lifting the pipe column without external interference force; the structure design is simple, and the bypass mechanism can be effectively prevented from being opened by the bottom hole pressure; when drilling, the drilling resistance is small, the speed is high, and the operation is safe.

Description

Packer bypass mechanism

Technical Field

The invention relates to a bypass mechanism for a packer.

Background

The existing packer, such as RTTS packer, can well bear the pressure from the lower part of the packer, and prevent the packer from being pushed by the formation pressure to move upwards, which causes the packer to lose the seal. The existing main problems are that the packer is difficult to unseal due to the absence of a pressure release mechanism during unsealing, special equipment is sometimes required to be used for performing pressure unsealing on the annular space, the operation is unsafe, and even if the annular space is pressurized, the packer cannot be unsealed, so that the underground drilling sticking accident can be caused.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides a packer bypass mechanism.

The technical scheme adopted by the invention for solving the technical problems is as follows: a packer bypass mechanism is characterized by comprising an upper joint, a bypass joint, a balance piston, a bypass outer cylinder and a sealing seat;

the lower end of the bypass joint is connected with an upper mandrel of the packer, the upper end of the bypass joint is connected with an upper joint, and a side hole is formed in the bypass joint;

the bypass outer barrel is sleeved on the outer ring of the bypass connector, and a bypass hole is formed in the bypass outer barrel;

the lower end of the bypass outer barrel is connected with the sealing seat, and the sealing seat is arranged at the upper end of the anchor tile barrel;

and a balance piston is arranged between the bypass outer barrel and the bypass joint and sleeved on the upper part of the bypass joint.

In one embodiment of the invention, the bypass connector further comprises a rectangular ring and a rectangular ring cap, the rectangular ring is arranged at the lower part of the bypass connector, the rectangular ring cap presses the fixed rectangular ring, and the upper end of the rectangular ring cap is arranged on the bypass connector.

In one embodiment of the invention, O-shaped sealing rings are arranged between the balance piston and the inner wall of the bypass outer cylinder and between the balance piston and the outer cylindrical surface of the upper part of the bypass joint.

In one embodiment of the invention, the threaded connection between the upper joint and the bypass joint and the threaded connection between the bypass joint and the upper spindle are locked by fastening screws;

and O-shaped sealing rings are arranged between the bypass joint and the upper joint and between the bypass joint and the bypass outer barrel.

The invention has the beneficial effects that: the bypass mechanism is matched with the packer for use, so that part of liquid below the packer is upwards discharged through the annular space among the cone, the rubber sleeve mandrel, the anchor tile cylinder and the mandrel in the drilling process of the packer, the drilling resistance is small, and the drilling speed is high. During the deblocking, the by-pass hole is opened earlier, and balanced packer top and bottom pressure makes the anchor tile in the anchor tile section of thick bamboo withdraw automatically for the easy deblocking of packer, and the deblocking power is little, need not take other measures, lifts the tubular column and can the deblocking. In the drilling process, part of liquid on the upper part of the packer flows downwards through the bypass hole and the cone, so that the drilling resistance is small and the speed is high; during setting, when formation pressure tries to push the packer to move upwards, the formation pressure acts on the upper end of the balance piston through a side hole on the bypass joint to generate downward pressure to keep the packer set, and the bottom hole pressure is effectively prevented from opening the bypass mechanism; the structural design is simple, and the operation is safe.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is an enlarged schematic view of the bypass mechanism at a in fig. 1.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

1-2, the packer bypass mechanism comprises an upper joint 1101, a bypass joint 1102, a balance piston 1103, a bypass outer cylinder 1104 and a sealing seat 1107;

the lower end of the bypass joint 1102 is connected with an upper mandrel 1 of the packer, the upper end is connected with an upper joint 1101, and a side hole 1108 is formed in the bypass joint 1102;

a bypass outer cylinder 1104 is sleeved on the outer ring of the bypass connector 1102, and bypass holes 1109 are formed in the bypass outer cylinder 1104;

the lower end of the bypass outer cylinder 1104 is connected with the sealing seat 1107, and the sealing seat 1107 is arranged at the upper end of the anchor tile cylinder 3;

a balance piston 1103 is arranged between the bypass outer cylinder 1104 and the bypass joint 1102, and the balance piston 1103 is sleeved on the upper portion of the bypass joint 1102.

The rectangular ring 1106 is arranged at the lower part of the bypass joint 1102, the rectangular ring 1106 is pressed and fixed by a rectangular ring cap 1105, and the O-shaped sealing rings 6 are arranged between the balance piston 1103 and the inner wall of the bypass outer cylinder 1104 and between the balance piston and the outer cylindrical surface of the bypass joint 1102.

The upper joint 1101 and the bypass joint 1102 are locked by a fastening screw 14 to prevent loosening; an O-ring 6 is disposed between the bypass joint 1102 and the upper joint 1101, and between the bypass joint 1102 and the bypass outer cylinder 1104.

In the process of drilling down, the bypass mechanism is under the action of the packer transposition mechanism, the transposition mechanism is as shown in part B in the figure and cannot be closed, wellbore liquid below the packer returns upwards from the periphery outside the packer, and part of the wellbore liquid returns upwards from a bypass hole 1109 through an annular channel formed by the upper mandrel 1 and the inside of the packer, so that the drilling down resistance is small, and the drilling down is smooth. After assigning the design degree of depth, the operation packer is set, and the dabber transposition is down, and spindle 2, lower spindle 1 are down, strut the slips card on the casing wall, continue to transfer the tubular column and apply certain setting load, and lower spindle 2, last spindle 1 are down, and rectangle circle 1106 contacts with seal receptacle 1107, and the bypass is closed, is pressing anchor tile section of thick bamboo 3 to go down compression packing element and is set. When packer below pressure is greater than packer top pressure, pressure pushes out anchor shoe 4 card on the casing wall, prevents that the packer from moving up or the deblocking, and pressure produces an upward force to upper and lower dabber simultaneously, tries to promote upper and lower dabber and shifts up and open the bypass, and formation pressure acts on the upper end of balanced piston through bypass joint side opening 1108 this moment, produces downward pressure and is pressing bypass joint 1102 for upper spindle 1, lower dabber 2 can not shift up, and then prevent that the bypass from opening.

And (3) unsealing operation: and lifting the pipe column, pulling the bypass connector 1102 and the upper mandrel 1 by the upper connector to move upwards, opening the bypass mechanism, balancing the pressure above and below the packer, automatically withdrawing the anchor tiles 4 in the anchor tile cylinder 3, releasing the setting force on the packer, and contracting and unsealing the rubber cylinder 5. In the process of tripping, the bypass mechanism is always in an open state and cannot be closed, liquid on the upper portion of the packer flows back to the well casing from the periphery outside the packer downwards, and partial liquid also flows back to the well casing from the annular channel formed by the mandrel and the inner portion of the packer from the bypass hole, so that tripping resistance is small, and tripping is smooth.

The bypass mechanism is matched with the packer for use, so that the packer is easy to unseal, the unsealing force is small, and the pipe column can be unsealed by lifting the pipe column without external interference force; the structure design is simple, and the bypass mechanism can be effectively prevented from being opened by the bottom hole pressure; when drilling, the drilling resistance is small, the speed is high, and the operation is safe.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A packer bypass mechanism is characterized by comprising an upper joint, a bypass joint, a balance piston, a bypass outer cylinder and a sealing seat;

2. The packer bypass mechanism according to claim 1, further comprising a rectangular ring and a rectangular ring cap, wherein the rectangular ring is arranged at the lower part of the bypass joint, the rectangular ring cap presses the fixed rectangular ring, and the upper end of the rectangular ring cap is arranged on the bypass joint.

3. The packer bypass mechanism according to claim 1, wherein O-ring seals are disposed between the balance piston and the inner wall of the bypass outer cylinder and between the balance piston and the outer cylindrical surface of the upper portion of the bypass joint.

4. The packer bypass mechanism according to any one of claims 1 to 3, wherein the threaded connection between the upper joint and the bypass joint and the threaded connection between the bypass joint and the upper mandrel are locked by fastening screws;