Traction chain for lowering and lifting a continuous steel pipe

 

(57) Abstract:

The invention relates to the field of operation and servicing of oil wells, and is intended for lowering and lifting a continuous steel pipe. The invention consists in that the traction chain for lowering and lifting a continuous steel pipe contains friction pads, and the friction pad provided with a plug-in rusk, consisting of four parts, two of which are steel, and the two are made of composite material and steel components of bread are placed on the edges of the friction pads, and the other two placed between them, as the composite material is a fiber, and the surface area of the steel components of bread refers to the surface area of components made of composite material, as of 1:1.5. The invention provides a high traction force of the friction pads throughout the period of operation of long steel pipes. 3 C.p. f-crystals, 3 ill.

The invention relates to the field of operation and servicing of oil wells using a continuous steel pipes and rods.

Known traction chain for lowering and lifting nepra, E 21 B 19/00, publ. 07.12.80, bull. N 45).

With the help of the traction chains make the descent and ascent of long pipes with the purpose of carrying out repairs in the well to recover oil and gas.

A disadvantage of the known device is that in the process of multiple bends of long steel pipe changes its profile and gets out-of-roundness. This, in turn, reduces the coverage of the friction pads long tubes and, consequently, reduced tractive force generated by the friction pads. The increase of the pressing force pads leads to damage to the crumbs of the friction pads that are performed, usually of hardened steel, having low coefficient of friction.

The technical effect of the use of the proposed technical solutions can be expressed in providing a high tractive effort of the friction pads throughout the period of operation of long steel pipes.

This technical result is achieved as follows.

Traction chain for lowering and lifting a continuous steel pipe contains friction pads, axles, cheeks circuit, and the friction pad provided with a plug-in with the social components of bread are placed on the edges of the friction pads, and the other two placed between them. As the composite material is a fiber. And the surface area of the steel components refers to the surface area of components made of composite material, as of 1 : 1.5.

In this case, all components of rusk secured in a socket and are in a floating state within the gap between the socket and the components of rusk.

Due to the fact that the friction pad is equipped with plug-in rusk, consisting of four parts, two of which are steel, and two made of composite material, and profile steel components rusk corresponds to the nominal outside diameter of pipe, provided with enough force the friction pads to restore its original section.

It is advisable as a composite material using the carbon fiber due to the fact that this material has high strength characteristics and has a high coefficient of friction. The pipe comes in contact over the entire area with a carbon components rusk, having an increased coefficient of friction.

The choice of percentage surface area Stalinabad providing the necessary efforts applied to the pipe, and providing the necessary contact in the area of capture.

In Fig. 1 shows a General view of the traction chain;

in Fig.2 - section a-a of Fig. 1;

in Fig. 3 - section b-B of Fig.2.

The conveyor chain includes a friction pad 1 is inserted into a special slot with the rusk 2, which consists of two steel components rusk 3, located on the edges of the friction pads 1, and two carbon components rusk 4, located between the steel components rusk 3.

Traction on the friction pad 1 is made through the axis 5, is equipped with a roller 6 and cheek 7.

When working long steel pipe is placed between the two friction pads 1 of the traction chain, the profile of which corresponds to the initial outer diameter of the tube without regard to its deformation (ovality). Pads is transmitted to a compressive force, and thanks to the steel components of rusk 3 this force may be sufficient to deform the pipe from the deformed section in the initial round. The pipe comes in contact over the entire area with a carbon components rusk 4, having an increased coefficient of friction.

Due to gaps midnapore area of contact in relation to long steel pipe, that provides high traction chain.

1. Traction chain for lowering and lifting a continuous steel pipe containing friction pads, axles, cheeks circuit, wherein the friction pad is equipped with plug-in rusk, consisting of four parts, two of which are steel, and the two are made of composite material and steel components of bread are placed on the edges of the friction pads, the other two placed between them.

2. The circuit under item 1, characterized in that the profile of the steel components rusk corresponds to the nominal outside diameter of the pipe.

3. The circuit under item 1, characterized in that the components of bread from composite material made carbon.

4. The circuit under item 1, characterized in that the surface area of the steel components refers to the surface area of components made of composite material, as of 1 : 1.5.

 

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