阅读说明：本技术 一种金属密封可溶解桥塞 (Metal sealing dissoluble bridge plug ) 是由 钱晓晨 王晓华 姚文超 于 2021-09-16 设计创作，主要内容包括：本发明提供一种金属密封可溶解桥塞,拉杆上依次安装有锥体、金属密封件、承压块、卡瓦、底座、拉帽；拉杆位于轴心,拉杆上部连接坐封工具,下部通过螺纹连接拉帽,锥体、卡瓦套装在拉杆上,底座套装在拉帽上；锥体下外端部是圆锥面；金属密封件上内表面是圆锥面,套装在锥体的圆锥面上,下内表面是圆筒；卡瓦上内端部是圆锥孔,上端面均匀的设有多个凹槽,套装在锥体的下外端面上；承压块均布装在卡瓦上端面的凹槽内,承压块内表面是圆锥面,套装在锥体的圆锥面上,承压块外表面是柱状结构,与金属密封件的下内表面配合装配。本发明在高压状态下对密封环有保护作用,密封效果好；减少工具的部件,缩短了工具的尺寸,有利于工具的下入。(The invention provides a metal sealing dissoluble bridge plug.A pull rod is sequentially provided with a cone, a metal sealing element, a bearing block, a slip, a base and a pull cap; the pull rod is positioned at the axis, the upper part of the pull rod is connected with a setting tool, the lower part of the pull rod is connected with a pull cap through threads, the cone and the slip are sleeved on the pull rod, and the base is sleeved on the pull cap; the lower outer end part of the cone is a conical surface; the upper inner surface of the metal sealing element is a conical surface and is sleeved on the conical surface of the cone, and the lower inner surface of the metal sealing element is a cylinder; the upper inner end part of the slip is a conical hole, the upper end surface is uniformly provided with a plurality of grooves, and the grooves are sleeved on the lower outer end surface of the cone; the bearing blocks are uniformly distributed in the grooves on the upper end surface of the slip, the inner surfaces of the bearing blocks are conical surfaces and are sleeved on the conical surfaces of the cone, and the outer surfaces of the bearing blocks are of columnar structures and are matched and assembled with the lower inner surface of the metal sealing element. The invention has protection effect on the sealing ring under high pressure state, and the sealing effect is good; the parts of the tool are reduced, the size of the tool is shortened, and the tool is favorable for running in.)

1. The metal-sealed dissolvable bridge plug is characterized by comprising a pull rod (1), wherein a cone (2), a metal sealing element (3), a bearing block (4), a slip (5), a base (6) and a pull cap (7) are sequentially arranged on the pull rod (1);

the pull rod (1) is positioned at the axis, the upper part of the pull rod (1) is connected with a setting tool, the lower part of the pull rod (1) is connected with a pull cap (7) through threads, the cone (2) and the slips (5) are sleeved on the pull rod (1), and the base (6) is sleeved on the pull cap (7);

the cone (2) is of a cylindrical structure, and the lower outer end part of the cone is a conical surface (8);

the metal sealing element (3) is of a cylindrical structure, the upper inner surface of the metal sealing element is a conical surface and is sleeved on the conical surface (8) of the cone (2), and the lower inner surface of the metal sealing element is a cylinder;

the slip (5) is of a cylindrical structure, the upper inner end part of the slip is a conical hole, the upper end face of the slip is uniformly provided with a plurality of grooves (11), and the slip is sleeved on the lower outer end face of the cone (2);

the bearing blocks (4) are uniformly distributed in grooves (11) on the upper end face of the slip (5), the inner surface of each bearing block (4) is a conical surface and is sleeved on the conical surface (8) of the cone (2), and the outer surface of each bearing block (4) is of a columnar structure and is matched and assembled with the lower inner surface of the metal sealing element (3).

2. The metal-sealing dissolvable bridge plug of claim 1, wherein: the lower end of the conical surface (8) on the cone (2) is provided with an external locking conical thread (9) with the processing length of 10-40mm, an internal locking conical thread (10) is arranged on the conical hole of the slip (5), and the internal locking conical thread (10) is meshed with the external locking conical thread (9).

3. The metal-sealing dissolvable bridge plug of claim 1, wherein: a plurality of notches (12) are uniformly and mutually intersected and cut along the axial direction from two end faces of the slip (5), each notch (12) is 5-10mm away from the end face, and a round hole (13) is radially formed in the tail end of each notch (12) from the outer cylindrical surface.

4. A metal sealing dissolvable bridge plug according to claim 3, wherein: the number of the grooves (11) on the upper end surface of the slip (5) is consistent with that of the notches (12), and the radial position of the notches (12) is consistent with that of the grooves (11).

5. The metal-sealing dissolvable bridge plug of claim 1, wherein: the inner surface of the base (6) is provided with a boss (14), and the boss (14) is positioned between the pull rod (1) and the pull cap (7) during assembly.

Technical Field

The embodiment of the invention relates to the technical field of oil and gas field development, in particular to a metal sealing dissolvable bridge plug.

Background

At present, soluble rubber is mostly adopted to be processed into sealing materials for the soluble bridge plugs used in the market. The dissoluble rubber material is characterized in that when the temperature of an oil well is high, the rubber strength is quickly lost, the sealing capability is reduced, and meanwhile, the dissoluble capability is reduced, the dissolution time is long or the dissolution is not carried out in a low-temperature state. In addition, the rubber-sealed bridge plug has a complex structure, more parts and long size, increases the cost of the tool and is not beneficial to running the tool.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provide a metal-sealed soluble bridge plug which is simple in structure, few in parts, short in length and reliable in sealing.

The specific technical scheme is as follows:

a metal sealing dissoluble bridge plug comprises a pull rod, wherein a cone, a metal sealing element, a bearing block, a slip, a base and a pull cap are sequentially arranged on the pull rod;

the pull rod is positioned at the axis, the upper part of the pull rod is connected with a setting tool, the lower part of the pull rod is connected with a pull cap through threads, the cone and the slip are sleeved on the pull rod, and the base is sleeved on the pull cap;

the cone is of a cylindrical structure, and the lower outer end part of the cone is a conical surface;

the metal sealing element is of a cylindrical structure, the upper inner surface of the metal sealing element is a conical surface and is sleeved on the conical surface of the cone, and the lower inner surface of the metal sealing element is a cylinder;

the slip is of a cylindrical structure, the upper inner end part of the slip is a conical hole, the upper end surface of the slip is uniformly provided with a plurality of grooves, and the slip is sleeved on the lower outer end surface of the cone;

the bearing blocks are uniformly distributed in the grooves on the upper end surface of the slip, the inner surfaces of the bearing blocks are conical surfaces and are sleeved on the conical surfaces of the cone, and the outer surfaces of the bearing blocks are of columnar structures and are matched and assembled with the lower inner surface of the metal sealing element.

The lower end of the conical surface on the cone is processed with an external locking taper thread with the length of 10-40mm, the conical hole of the slip is provided with an internal locking taper thread, and the internal locking taper thread is meshed with the external locking taper thread.

And uniformly and mutually intersecting and cutting a plurality of notches from two end surfaces of the slip along the axial direction, wherein each notch is 5-10mm away from the end surface, and a round hole is radially formed from the outer cylindrical surface at the tail end of each notch.

The number of the grooves on the upper end surface of the slip is consistent with that of the notches, and the radial direction of the notches is consistent with that of the grooves.

A boss is processed on the inner surface of the base and is positioned between the pull rod and the pull cap during assembly.

The invention has the beneficial effects that:

1. the lower part of the metal sealing element is additionally provided with the bearing block, so that the sealing capability and the adaptability of the bridge plug are improved;

2. the slips are designed into a whole, so that the processing difficulty of parts is reduced, and the anchoring reliability is improved;

3. the self-locking structure design of the slips and the cone reduces the structure of the bridge plug and reduces the tool cost;

4. the traditional bridge plug is set by shearing pins or shearing threads, the bridge plug is set by shearing rings, the setting force is more accurate, the structure is simpler,

5. through new structural design, the bridge plug is short in size and large in inner drift diameter, so that the running-in of tools is facilitated, and meanwhile, a large production channel can be provided and the dissolution is facilitated.

Drawings

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

FIG. 2 is a schematic view of the structure of the expanded vertebral body;

FIG. 3 is a schematic structural view of the slips and the bearing block;

fig. 4 is a schematic structural diagram of the base.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Referring to fig. 1, the metal sealing dissoluble bridge plug comprises a pull rod 1, wherein a cone 2, a metal sealing element 3, a bearing block 4, a slip 5, a base 6 and a pull cap 7 are sequentially arranged on the pull rod 1;

the pull rod 1 is positioned at the axis, the upper part of the pull rod 1 is connected with a setting tool, the lower part of the pull rod 1 is connected with a pull cap 7 through threads, the cone 2 and the slips 5 are sleeved on the pull rod 1, and the base 6 is sleeved on the pull cap 7;

the cone 2 is of a cylindrical structure, and the lower outer end part of the cone is a conical surface 8;

the metal sealing element 3 is of a cylindrical structure, the upper inner surface of the metal sealing element is a conical surface and is sleeved on the conical surface 8 of the cone 2, and the lower inner surface of the metal sealing element is a cylinder;

the slips 5 are of a cylindrical structure, the upper inner end part of the slips is a conical hole, the upper end face of the slips is uniformly provided with a plurality of grooves 11, and the slips are sleeved on the lower outer end face of the cone 2;

the bearing blocks 4 are uniformly distributed in the grooves 11 on the upper end surface of the slips 5, the inner surfaces of the bearing blocks 4 are conical surfaces and are sleeved on the conical surfaces 8 of the cone 2, and the outer surfaces of the bearing blocks 4 are of columnar structures and are matched and assembled with the lower inner surface of the metal sealing element 3.

Referring to fig. 2, the lower end of the conical surface 8 on the cone 2 is provided with an external locking taper thread 9 with the length of 10-40mm, the conical hole of the slip 5 is provided with an internal locking taper thread 10, and the internal locking taper thread 10 is meshed with the external locking taper thread 9.

Referring to fig. 3, a plurality of cuts 12 are evenly and mutually intersected along the axial direction from two end faces of the slip 5, each cut 12 is 5-10mm away from the end face, and a round hole 13 is radially arranged from the outer cylindrical face at the tail end of each cut 12.

The grooves 11 on the upper surface of the slips 5 correspond in number to the notches 12, and the radial orientation of the notches 12 corresponds to the radial orientation of the grooves 11.

Referring to fig. 4, the inner surface of the base 6 is provided with a boss 14, and the boss 14 is positioned between the pull rod 1 and the pull cap 7 during assembly.

The upper end part of the pull rod 1 is connected with a setting tool, the lower end part of the pull rod 1 is connected with a pulling cap 7, and after the bridge plug is set, the pull rod 1 and the pulling cap 11 are pulled out of the bridge plug.

The pull rod 1 and the pull cap 7 are made of insoluble metal materials, and the cone 2, the metal sealing element 3, the bearing block 4, the slips 5 and the base 6 are made of soluble metal materials.

After the bridge plug is set, the pull rod 1 and the pull cap 7 are drawn out of the bridge plug, other components are thrown in the well to seal the fractured intervals, the components thrown in the well are all made of magnesium-based dissolvable metal materials, and after fracturing is completed, the components are automatically dissolved.