CN206280030U - A kind of lead sealing sleeve pipe rejoining device - Google Patents

Abstract

The utility model provides a lead-seal casing repair connector, which belongs to the technical field of workover tools. The bushing adapter includes guide shoe, A-type packing and cylinder body, the guide shoe is connected to the lower end of the cylinder body by thread, the upper joint is threadedly connected to the upper end of the cylinder body, and the A-type packing is installed on the guide shoe and the cylinder body Between them, the inner cavity of the cylinder body is provided with a lead seal ring and a slider seat respectively, and the slider and the slider seat are connected through a dovetail groove, and the slider seat is limited in the cylinder by the end of the upper joint. In the body, a limit step is set in the upper joint, and a spacer ring and a wedge-shaped pressure ring are respectively installed at both ends of the lead seal ring. The utility model adopts the lead seal sealing ring to seal the downhole casing, which solves the technical problems that the sealing of the conventional casing repair joint is difficult to control, the rubber seal is easy to corrode, the life is short, and the construction is complicated. It has reasonable design, simple structure, It has the advantages of convenient use, simple construction, stable sealing, effectively improving the strength of the patch and prolonging the service life.

Description

A lead-sealed bushing repair connector

technical field

The utility model relates to a lead-seal casing repair connector, which belongs to the technical field of workover tools.

Background technique

At present, downhole casings are damaged due to various reasons, such as chemical corrosion, formation extrusion or mechanical wear, etc. In order to improve the production and recovery of oil wells, it is extremely necessary to repair wells with damaged casings. It is difficult to control the sealing of the conventional casing joints, and the rubber seals are easy to corrode and have a short service life, and the construction is complicated.

Contents of the invention

The purpose of the utility model is to provide a high-life lead seal bushing repair joint with simple structure, convenient use, simple construction, effective improvement of joint strength and prolonged service life. The joint can deform and seal the seal ring of the lead seal much easier.

The technical scheme of the utility model: a lead-sealed bushing reconnector, including guide shoe, A-type packing, cylinder body and upper joint, the guide shoe is connected to the lower end of the cylinder body by thread, and the upper joint is connected to the cylinder body by thread The upper end of the A-type packing is installed between the guide shoes and the cylinder, and a limit step is set in the upper joint. The tooth block is installed in the sliding tooth block seat through the dovetail groove, and the sliding tooth block seat is limited in the cylinder body by the end of the upper joint. The lead seal sealing ring and the A-type packing form two seals, and the lead seal sealing ring is close to A spacer ring is installed at one end of the guide shoe, and a wedge-shaped pressing ring with an inclined plane is installed at the end of the lead-seal sealing ring close to the upper joint, and the lead-seal sealing ring and the wedge-shaped pressing ring contact through the inclined plane.

Furthermore, in order to keep the sliding tooth block from breaking during operation, the waist size of the sliding tooth block cannot be less than 2 mm, that is, the opening size of the dovetail groove is greater than 2 mm. In order to ensure that the sliding block has sufficient bite force for the casing, 4-12 sliding block seats are arranged in the circumferential direction of the cylinder, preferably 6 sliding block seats; and each working part of the sliding block is provided with a zigzag raised for a tighter bite.

Furthermore, the metal that is easy to deform can be selected for the lead seal sealing ring and the A-type packing, preferably aluminum alloy. In order to facilitate the deformation and sealing of the lead seal ring along the inclined plane of the wedge-shaped pressure ring, the acute angle of the inclined plane is preferably less than 45°.

The limit step on the upper joint not only needs to limit the axial serial movement of the sliding tooth block seat, but also needs to limit the axial position of the casing, so the size of the limit step must be able to cover the wall thickness of the casing, that is, the end surface of the casing It should fall completely within the surface range of the limit step.

Furthermore, an O-ring is placed at the joint between the cylinder body and the upper joint to enhance its sealing performance.

Due to the adoption of the above technical solution, the utility model has the advantages that: the utility model uses a lead seal ring to seal the downhole casing, which solves the problem that the sealing of the conventional casing patch is difficult to control, and the rubber seal is easy to corrode and has a short service life. There are technical problems such as complicated construction, and at the same time, the wedge-shaped pressure ring makes the deformation of the lead seal ring easier and the sealing effect is better.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of a lead seal sealing ring;

Explanation of reference signs: 1-guide shoes, 2-type A packing, 3-cylinder body, 4-spacer ring, 5-lead seal ring, 6-wedge-shaped pressure ring, 7-sliding tooth block seat, 8- Sliding tooth block, 9-O-ring, 10-upper joint.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Embodiment of the present utility model: the structural diagram of the lead-sealed bushing reconnector of the present utility model is shown in Fig. 1 and Fig. 2, including guide shoes 1, A-type packing 2 and cylinder body 3, guide shoes 1 are connected by threads At the lower end of the cylinder 3, the upper joint 10 is screwed to the upper end of the cylinder 3, and the A-type packing 2 is installed between the shoe 1 and the cylinder 3, and the inner cavity of the cylinder 3 is respectively provided with a lead seal ring 5 and the sliding tooth block seat 7, a spacer ring 4 is installed on the side of the lead seal sealing ring 5 close to the guide shoe, and a wedge-shaped pressure ring 6 with a slope is installed on the other side, and the sliding tooth block 8 is installed In the sliding tooth block seat 7, the sliding tooth block seat 7 is limited in the cylinder body 3 by the end of the upper joint 10, and a limiting step is arranged in the upper joint 10. In order to improve the sealing performance between the cylinder body 3 and the upper joint 10 , an O-ring 9 is provided at the connecting end of the cylinder body 3 and the upper joint 10 .

When the utility model is working, the upper joint 10 is first connected to the lowermost end of the new casing that needs to be repaired, and then the casing repair connector is put into the downhole. When the casing repair connector is close to the downhole casing, the downhole casing The tube first passes through the lead seal ring 5 through the guide shoe 1 and then contacts the end surface of the sliding tooth block 8, the sliding tooth block 8 is pushed up first, and the sliding tooth block 8 moves upward along the dovetail groove set in the sliding tooth block seat 7 The casing passes through the inner diameter, and the downhole casing continues to go up to the limit step of the upper joint 10 after passing through the sliding block 8, and the sliding block 8 of the lifting string bites the casing along the slope to complete the catch; The column drives the cylinder body 3 to go up. When the cylinder body 3 goes up, the spacer ring 4 at the lower end pushes the lead seal ring 5 to go up. The inclined surface of the tooth block 8 fits together, the greater the lifting load, the greater the seating pressure on the lead seal seal ring 5 given by the sliding tooth block seat 7 and the cylinder body 3 through the spacer ring 4 and the wedge-shaped pressure ring 6, the lead seal seal ring 5 The tighter it is compressed, the greater the deformation, and the better the sealing effect.

Claims (8)

1. a kind of lead sealing sleeve pipe rejoining device, including guide shoe, A types packing, cylinder and top connection, guide shoe are threadedly attached in cylinder The lower end of body, top connection is threadedly attached in the upper end of cylinder, and A types packing is arranged between guide shoe and cylinder, in top connection Inside it is provided with limited step, it is characterised in that：Lead sealing sealing ring and tooth-sliding block seat, tooth-sliding block are respectively arranged with the inner chamber of cylinder By dovetail groove in tooth-sliding block seat, tooth-sliding block seat is by spacing in cylinder, the described lead sealing sealing ring in top connection end Two seals are formed with A types packing, lead sealing sealing ring is provided with spacer ring near guide shoe one end, and lead sealing sealing ring is near top connection one End is provided with a wedge pressure ring with inclined-plane, and contact of incline plane is passed through between lead sealing sealing ring and wedge pressure ring.

2. lead sealing sleeve pipe rejoining device according to claim 1, it is characterised in that：The dovetail channel opening that the tooth-sliding block does Size is more than 2mm.

3. lead sealing sleeve pipe rejoining device according to claim 2, it is characterised in that：The tooth-sliding block number is 4-12, edge Cylinder is circumferentially uniformly distributed.

4. any lead sealing sleeve pipe rejoining device according to claim 1-3, it is characterised in that：The tooth-sliding block working position sets It is equipped with sawtooth projection.

5. lead sealing sleeve pipe rejoining device according to claim 1, it is characterised in that：The lead sealing sealing ring and A type packings Material is aluminium alloy.

6. lead sealing sleeve pipe rejoining device according to claim 1, it is characterised in that：The lead sealing sealing ring bevel angle is less than 45°。

7. lead sealing sleeve pipe rejoining device according to claim 1, it is characterised in that：The limited step chi that the top connection is set Very little covering casing wall thickness size.

8. lead sealing sleeve pipe rejoining device according to claim 1, it is characterised in that：The cylinder sets with the connection end of top connection It is equipped with O-ring.