CN115012868A

CN115012868A - Novel setting tool

Info

Publication number: CN115012868A
Application number: CN202210659398.4A
Authority: CN
Inventors: 曹晓龙; 张正旭; 霍永辉
Original assignee: Chengdu Rock Faithwell Technology Co ltd
Current assignee: Chengdu Rock Petroleum Technology Development Co ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-09-06

Abstract

The invention provides a novel setting tool which comprises a mandrel (1), a thrust cylinder (2), a positioning ring (3) and a shearing pin (4), wherein the mandrel (1) comprises a first hollow section (11), a solid section (12) and a second hollow section (13), a mandrel limiting step (15) is arranged on the outer side of the first hollow section (11) close to an air passage (14), the thrust cylinder (2) is internally provided with the thrust cylinder limiting step (21), the hole bottom of the first hollow section (11) is provided with the air passage (14) of the inclined solid section (12), the air passage (14) penetrates through the mandrel (1) and is communicated with the inside and the outside, and the shearing pin (4) is arranged at the positioning section to axially fix the positioning ring (3) and the mandrel (1). The invention solves the technical problems of unbalanced underground pressure and loss of setting force.

Description

Novel setting tool

Technical Field

The invention relates to the technical field of petroleum downhole tools, in particular to a novel setting tool.

Background

In the oil and gas drilling industry, zonal isolation is a necessary operation means for oil and gas production, formation water collection, carbon dioxide sequestration or fluid injection into a well, and packers are very common zonal isolation tools. The types of packers are various, but generally, the packer assembly needs to be set through mechanical force or hydraulic force, so that the purpose of sealing and isolating is achieved. The existing setting method of the packer and the bridge plug mainly comprises two major types, namely hydraulic setting and explosive setting. The hydraulic setting is realized by controlling the liquid pressure on the ground to enable the inner and outer pipe columns to move relatively to provide setting force through a complex liquid channel and piston structure of a setting tool. The explosive setting is realized by compressing the explosive and exploding through an electric trigger head, and the high-energy gas generated by explosion pushes a piston structure to move relatively.

In patent CN201910593968.2 there is disclosed a downhole setting tool and method, the tool comprising: be provided with the shell coupling mechanism of cavity runner, pulse power output mechanism and electric liquid explode actuating mechanism, electric liquid explodes actuating mechanism and includes: the piston cavity is provided with a first electrode and a second electrode, and metal powder suspension electric explosion liquid is contained in the piston cavity between the first electrode and the second electrode; a piston rod; the liquid channel switch piston is abutted against the lower part of the piston rod and is fixed on the shell connecting mechanism through a shearing pin, and a piston flow channel is arranged in the liquid channel switch piston; after the electro-hydraulic explosion starting mechanism is started, the piston rod can be pushed downwards to cut the shearing pin, and the piston flow channel is communicated with the cavity flow channel. The patent can better satisfy the setting operation needs of packer and bridge plug in the staged fracturing exploitation. But it is unbalanced in compression.

In patent CN201621292226.4 discloses a set device and downhole tool in pit, it relates to oil and gas and bores the well completion technical field, and set device includes in the pit: the body sets up first isolation mechanism outside the body, first isolation mechanism establishes including the cover first outer tube and the second outer tube outside the body, set up and be in first outer tube with first flexible piece between the second outer tube, set up and be in first outer tube the second outer tube first flexible piece with phase change material between the body, when phase change material's volume change, first flexible piece can the radial direction of body takes place to remove. The downhole setting device in the patent can realize setting and unsetting without mechanical or hydraulic force, but there is a loss of setting force.

The patent CN202022318937.7 discloses a setting tool for setting a packer by using a coiled tubing, which comprises a connecting ball seat, a setting ball and a traction rod, wherein the upper end and the lower end of the connecting ball seat are both connected with the coiled tubing, the connecting ball seat is provided with a first axial cavity and a second axial cavity which are arranged from top to bottom, and the inner diameter of the first axial cavity is larger than that of the second axial cavity; the setting ball is a solid sealing ball body, a spheroid, a hemisphere or a hemisphere-like body, the diameter or the diameter-like body of the setting ball is smaller than the inner diameter of the first axial cavity and larger than the inner diameter of the second axial cavity, and the setting ball is placed above the second axial cavity to realize plugging of the connecting ball seat; the upper end of the traction rod is connected with the coiled tubing, and the lower end of the traction rod is connected with the setting ball. The device has three functions of temporary blocking, setting and ball returning, has a simple structure and reliable operability, and is suitable for oil testing and well completion operation of most of oil and gas fields in China. But also has the problem of pressure imbalance.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a novel setting tool. Through the cooperation relation of reasonable setting dabber, thrust section of thick bamboo and holding ring. The technical problems of underground pressure imbalance and setting force loss are solved.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a novel setting instrument, includes dabber, thrust section of thick bamboo, holding ring and shear pin, wherein:

the mandrel is of a cylindrical structure and comprises a hollow section I, a solid section and a hollow section II which are sequentially connected;

the hole bottom of the hollow section I is provided with an air passage of the inclined solid section; the air passage is communicated with the inside and the outside of the mandrel in a penetrating way;

a mandrel limiting step is arranged on the outer side of the hollow section I, close to the air passage;

the thrust cylinder is of a hollow circular tube structure;

the inner wall of the thrust cylinder is provided with a thrust cylinder limiting step;

the mandrel is arranged in the thrust cylinder;

the inner surface of the thrust cylinder limiting step is matched with the outer surface of the mandrel;

the outer surface of the mandrel limiting step is matched with the inner surface of the thrust cylinder;

the positioning ring is of a circular tube structure and is arranged between the mandrel and the thrust cylinder;

the shear pin is arranged in the positioning ring and the mandrel, and the positioning ring and the mandrel are axially fixed and are axially fixed.

Optionally or preferably, a plurality of O-shaped sealing rings are arranged on the mandrel limiting step;

a plurality of O-shaped sealing rings are arranged on the thrust cylinder limiting step;

and silicone grease is smeared on the surfaces of the O-shaped sealing rings.

Optionally or preferably, the surfaces of the mandrel, the thrust cylinder, the positioning ring and the shear pin are sprayed with rust preventive oil.

Optionally or preferably, the first hollow section and the second hollow section are respectively located at two ends of the mandrel, and blind holes are formed in two end faces of the mandrel.

Optionally or preferably, the length of the first hollow section is greater than that of the second hollow section;

the diameter of the blind hole of the first hollow section is larger than that of the blind hole of the second hollow section;

the outer diameter of the hollow section II is smaller than that of the solid section.

Alternatively or preferably, the positioning ring comprises a sealing section with a smaller outer diameter and a positioning section with a larger outer diameter;

the sealing section is arranged between the mandrel and the thrust cylinder and is positioned on the inner side of the tail part of one end, far away from the hollow section II, of the thrust cylinder;

the positioning section is provided with a tail part of one end of the sealing section, which is far away from the hollow section II.

Optionally or preferably, the outer diameter of the positioning section is equal to that of the thrust cylinder;

the inner diameter of the positioning ring is equal to the outer diameter of the mandrel;

a plurality of O-shaped sealing rings are arranged on the inner surface and the outer surface of the sealing section.

Based on the technical scheme, the following technical effects can be generated:

the area of the end face of the positioning section of the positioning ring of the novel setting tool is constant and equal to the pressed area of the thrust cylinder at the other end, the thrust cylinder is always pressed and balanced in the setting process, extra power is not needed to overcome underground pressure, and explosion energy required by setting is convenient to control. The technical problems of underground pressure imbalance and setting force loss are solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

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

FIG. 2 is a schematic illustration of the installation of the shear pin of the present invention;

FIG. 3 is a schematic view of the structure of the air passage of the present invention

The reference numbers in the figures are:

1-mandrel, 2-thrust cylinder, 3-positioning ring, 4-shearing pin, 11-hollow section I, 12-solid section, 13-hollow section II, 14-air passage, 15-mandrel limiting step and 21-thrust cylinder limiting step.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

as shown in fig. 1-3:

the embodiment provides a novel setting instrument, including dabber 1, thrust cylinder 2, holding ring 3 and shear pin 4, wherein:

the mandrel 1 is of a cylindrical structure, and the mandrel 1 comprises a first hollow section 11, a solid section 12 and a second hollow section 13 which are sequentially connected;

the hole bottom of the hollow section I11 is provided with an air passage 14 of the inclined solid section 12;

the air passage 14 penetrates through the inside and the outside of the mandrel 1 and is a passage for providing pressure for the combustion of gunpowder, so that gas formed by the combustion of the gunpowder enters the cavity and provides thrust to finish the setting action of the setting tool;

a mandrel limiting step 15 is arranged on the outer side of the hollow section I11, close to the air passage 14;

the thrust cylinder 2 is of a hollow circular tube structure, and the inner wall of the thrust cylinder 2 is provided with a thrust cylinder limiting step 21;

the mandrel 1 is arranged in the thrust cylinder 2, the inner surface of the thrust cylinder limiting step 21 is matched with the outer surface of the mandrel 1, and the outer surface of the mandrel limiting step 15 is matched with the inner surface of the thrust cylinder 2;

the positioning ring 3 is of a circular tube structure, and the positioning ring 3 is arranged between the mandrel 1 and the thrust cylinder 2;

the shear pin 4 is arranged in the positioning ring 3 and the mandrel 1, and the positioning ring 3 and the mandrel 1 are axially fixed.

In this embodiment, a plurality of O-ring seals are disposed on the mandrel limiting step 15;

a plurality of O-shaped sealing rings are arranged on the thrust cylinder limiting step 21;

and silicone grease is smeared on the surfaces of the O-shaped sealing rings, so that the mandrel 1 and the thrust cylinder 2 can be sealed and can normally slide relatively.

In this embodiment, the surfaces of the mandrel 1, the thrust cylinder 2, the positioning ring 3 and the shear pin 4 are all sprayed with rust preventive oil.

In this embodiment, the first hollow section 11 and the second hollow section 13 are respectively located at two ends of the mandrel 1, and blind holes are formed in two end faces, so that a pressure relief channel can be formed with the thrust cylinder 2 after normal setting and releasing.

In this embodiment, the length of the first hollow section 11 is greater than that of the second hollow section 13, the diameter of the blind hole of the first hollow section 11 is greater than that of the blind hole of the second hollow section 13, and the outer diameter of the second hollow section 13 is smaller than that of the solid section 12, so that the underwater balance of the underwater balance device can be kept.

In this embodiment, the positioning ring 3 includes a sealing section with a smaller outer diameter and a positioning section with a larger outer diameter;

the sealing section is arranged between the mandrel 1 and the thrust cylinder 2 and is positioned on the inner side of the tail part of one end, far away from the hollow section II 13, of the thrust cylinder 2;

the positioning section is provided with a tail part of one end, away from the hollow section II 13, of the sealing section, and the positioning ring 3 is of a step-shaped structure and is convenient to fix between the mandrel 1 and the thrust cylinder 2.

In the embodiment, the outer diameter of the positioning section is equal to that of the thrust cylinder 2, and the inner diameter of the positioning ring 3 is equal to that of the mandrel 1;

all be equipped with a plurality of O shape sealing washer on the internal surface of seal segment and the surface, can guarantee that whole instrument is sealing state when going into the well.

The embodiment has the following advantages:

1. in this embodiment, both ends of the thrust cylinder 2 can always maintain pressure balance;

2. in the embodiment, the explosion energy required by setting is convenient to control;

3. in the embodiment, the structures have good sealing performance;

the working process of the novel setting tool provided by the invention is as follows:

when the seat sealing is carried out, the impact generated by explosion in the hollow section I11 enters a cavity formed between the mandrel limiting step 15 and the thrust cylinder limiting step 21 from the air passage 14, the shearing pin 4 is sheared, the thrust cylinder 2 moves towards the direction of the hollow section II 13, and when the thrust cylinder limiting step 21 moves to the hollow section II 13, the pressure is released and the seat sealing is finished.

Example 2:

this example differs from example 1 in that:

in this embodiment, the mandrel 1, the thrust cylinder 2 and the positioning ring 3 are all made of 42 CrMo.

In this embodiment, the shear pin 4 is made of HPb 59-1.

In this embodiment, the outer diameters of the sealing surfaces at the two ends of the mandrel 1 are equal to ensure that the pressures applied to the two ends are balanced after the mandrel is lowered into the well.

In this embodiment, the shear pin is disposed at the positioning segment to axially fix the positioning ring and the mandrel.

The embodiment has the following advantages:

3. in the embodiment, the structures have good sealing performance;

4. in this embodiment, each component has excellent high temperature resistance and corrosion resistance.

The structures, functions, and connections disclosed herein may be implemented in other ways. For example, the embodiments described above are merely illustrative, and other mounting arrangements are possible, such as retaining rings, shear pins, etc., e.g., multiple components may be combined or integrated with one another; in addition, functional components in the embodiments herein may be integrated into one functional component, or each functional component may exist alone physically, or two or more functional components may be integrated into one functional component.

The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A novel setting tool is characterized in that: including dabber (1), thrust cylinder (2), holding ring (3) and shear pin (4), wherein:

the mandrel (1) is of a cylindrical structure, and the mandrel (1) comprises a first hollow section (11), a solid section (12) and a second hollow section (13) which are sequentially connected;

the hole bottom of the hollow section I (11) is provided with an air passage (14) of the inclined solid section (12); the air passage (14) is communicated with the inside and the outside of the mandrel (1) in a penetrating way;

a mandrel limiting step (15) is arranged on the outer side of the first hollow section (11) close to the air passage (14);

the thrust cylinder (2) is of a hollow circular tube structure, and the inner wall of the thrust cylinder (2) is provided with a thrust cylinder limiting step (21);

the mandrel (1) is arranged in the thrust cylinder (2), the inner surface of the thrust cylinder limiting step (21) is matched with the outer surface of the mandrel (1), and the outer surface of the mandrel limiting step (15) is matched with the inner surface of the thrust cylinder (2);

the positioning ring (3) is of a circular tube structure, and the positioning ring (3) is arranged between the mandrel (1) and the thrust cylinder (2);

the shear pin (4) is arranged in the positioning ring (3) and the mandrel (1), and the positioning ring (3) and the mandrel (1) are axially fixed.

2. A new setting tool as claimed in claim 1, characterised in that: a plurality of O-shaped sealing rings are arranged on the mandrel limiting step (15); a plurality of O-shaped sealing rings are arranged on the thrust cylinder limiting step (21); and silicone grease is smeared on the surfaces of the O-shaped sealing rings.

3. A new setting tool as claimed in claim 1, characterised in that: and antirust oil is sprayed on the surfaces of the mandrel (1), the thrust cylinder (2), the positioning ring (3) and the shearing pin (4).

4. A new setting tool as claimed in claim 1, characterised in that: the first hollow section (11) and the second hollow section (13) are respectively located at two ends of the mandrel (1), and blind holes are formed in two end faces.

5. A new setting tool as claimed in claim 4, characterised in that: the length of the first hollow section (11) is larger than that of the second hollow section (13), the diameter of the blind hole of the first hollow section (11) is larger than that of the blind hole of the second hollow section (13), and the outer diameter of the second hollow section (13) is smaller than that of the solid section (12).

6. A new setting tool as claimed in claim 1, characterised in that: the holding ring (3) includes the less sealed section of external diameter and the great location section of external diameter, sealed section setting is between dabber (1) and thrust section of thick bamboo (2), and it is inboard to be located the afterbody of the one end of thrust section of thick bamboo (2) keeping away from hollow section two (13), the location section sets up the afterbody of the one end of hollow section two (13) is kept away from to sealed section.

7. The novel setting tool of claim 6, wherein: the outer diameter of the positioning section is equal to that of the thrust cylinder (2), the inner diameter of the positioning ring (3) is equal to that of the mandrel (1), and a plurality of O-shaped sealing rings are arranged on the inner surface and the outer surface of the sealing section.