A multi-layer composite anti-eccentric wear continuous sucker rod and its preparation device and method

Abstract

The invention relates to a multilayer compound eccentric-wear-preventing continuous sucker rod and a manufacturing device and a manufacturing method thereof. The sucker rod is characterized in that one section or several sections of the external surface of a fiber reinforced resin matrix composite rod body are respectively covered with a thermosetting wear layer; each thermosetting wear layer is made from one of polyurethane, a fluorocarbon coating, modified epoxide resin, vinylester resin, unsaturated polyester and phenolic resin; by adopting a manufacturing technology of multilayer composite winding and pultrusion or weaving and pultrusion, an internal layer of longitudinal fibers, an intertwining layer or a weaving layer and an external layer of longitudinal fibers are formed from interior to exterior in sequence; the manufactured rod body has a continuous length of 0-5000m. The sucker rod has the beneficial effects that the radial strength and the axial compressive strength are enhanced; the corrosion resistance and the eccentric wear resistance of the thermosetting wear layers are improved by 30%; the maximum temperature tolerance of the thermosetting wear layers is up to 190 DEG C; meanwhile, the bonding between an sucker rod body and each thermosetting wear layer is greater in length and quite high in strength, so that the slippage and the layering of an eccentric-wear-preventing layer from the surface of the sucker rod in the normal operation of an oil well are avoided.

Description

technical field [0001] The invention relates to an anti-eccentric wear continuous sucker rod and a preparation device thereof, in particular to a multi-layer composite anti-eccentric wear continuous sucker rod and its preparation device and method. Background technique [0002] Due to the increasingly complex types of developed reservoirs, the continuous increase of well depth and the continuous deterioration of the well and mine environment, the problems of corrosion and eccentric wear have become problems that need to be solved urgently in the oil production process of oilfields. Because of its light weight, high strength and corrosion resistance, composite sucker rods have gradually replaced traditional metal sucker rods. The composite material sucker rods currently used mainly include two categories: glass fiber reinforced plastic sucker rods and carbon fiber reinforced composite continuous sucker rods. FRP sucker rods are prepared by pultrusion of glass fiber reinforce...

AI Technical Summary

Problems solved by technology

Chinese patent CN1417449 discloses a method for preparing an anti-friction sucker rod. The method is to secondary injection mold an anti-friction block made of nylon and other materials on the formed sucker rod body to reduce the use of cladding materials and reduce the continuous wrapping. Covering the cost and complexity of the process, but the size of the injection-molded anti-wear block is relatively small, and it is relatively independently distributed on the rod body. Often, the anti-wear block is separated from the rod body, and the phenomenon of "candied haws" appears

However, the sucker rod adopts a one-time overall processing method of pultrusion and coating (including wire feeding-resin dipping-coating layer coating-preforming-curing-coiling process), and the coating layer is fiber fabric reinforced thermosetting resin. Not only increases the material cost, but also the partial wear resistance of the fiber fabric coating is not ideal

In addition, since the cross section of the carbon fiber reinforced composite continuous sucker rod is rectangular or elliptical, and its thickness is only 3 to 5mm, when using special equipment to go down well, it is almost impossible to choose the material of the clamping part, and can only use Two-piece clamping, the left and right directions cannot be limited, and it is easy for the rod body to deviate from the clamping part

Therefore, it is difficult to develop the structure and materials of the clamping part of its special downhole operation equipment, which has become a technical bottleneck in the application of continuous sucker rods made of carbon fiber reinforced composite materials, which limits the large-scale promotion and application of this product

Invention patent CN200910272324.X discloses a continuous sucker rod, which uses unidirectional reinforced fiber pultrusion to coat a thermoplastic wear-resistant layer. Its structure has poor radial compression performance, and the hardness of the thermoplastic wear-resistant Poor grinding performance and other defects, unable to meet long-term use and operation requirements

The problem is that due to the thermoplastic wear-resistant layer, its bending performance and radial and axial compressive properties are slightly inferior; in addition, the temperature resistance and wear resistance are also worse than those of the thermosetting wear-resistant layer.

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