Fibre reinforced composite anti-eccentric coiled rod as well as preparation device and preparation method thereof

A composite material and fiber-reinforced technology, applied in drill pipe, drilling equipment, earth-moving drilling, etc., can solve the problem that the eccentric wear resistance of fiber fabric coating layer is not ideal, reduce the cost of continuous coating and process complexity, structure and The difficulty of material development and other problems can improve the continuous stability, avoid slippage and delamination, and reduce the probability of breakage.

Active Publication Date: 2013-05-01
SHENGLI OIL FIELD XINDA PIPE IND TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

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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

Method used

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  • Fibre reinforced composite anti-eccentric coiled rod as well as preparation device and preparation method thereof
  • Fibre reinforced composite anti-eccentric coiled rod as well as preparation device and preparation method thereof
  • Fibre reinforced composite anti-eccentric coiled rod as well as preparation device and preparation method thereof

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preparation example Construction

[0030] By adopting the above-mentioned preparation device, realizing the preparation method of the present invention is specifically:

[0031] (a) A plurality of bundles of fibers (glass fiber, carbon fiber or basalt fiber) are drawn from the drawing frame 1, and are pretreated by the heating furnace 2 under the traction of the traction device 10. The atmosphere is air, and the furnace temperature is between 80 and 150°C. The traction speed is between 0.08-1.5 m / min, and the passage time is 1.0-12.5 minutes; the fibers coming out of the heating furnace 2 enter the injection mold 4, and the injection mold 4 is filled with the resin matrix glue 4.3 injected by the injection machine 3, and the resin matrix Epoxy, vinyl ester or polyurethane resins.

[0032] (b) The fiber bundles impregnated with the glue in the injection mold 4 are then solidified and formed by the pultrusion mold 6. A mold cooling device 5 is provided at the entrance of the pultrusion mold 6 to reduce the mold i...

Embodiment 1

[0037] Multiple bundles of carbon fiber filaments enter the surface treatment furnace through the wire hole of the wire rack. The furnace temperature is 120°C and the traction speed is 1.0 m / min. The carbon fiber after heat treatment enters the injection mold, which is filled with the resin injected by the injection machine The ratio of glue and resin glue is polyol:isocyanate=100:121. The dipped carbon fiber enters the pultrusion die, and the entrance of the pultrusion die is cooled to room temperature by circulating water cooling, but after the water cooling, the mold is heated in three stages by the mold heating device, and the temperature is 110°C, 135°C, and 155°C. The formed composite material rod continues to advance at a speed of 1.0 m / min, and passes through a post-curing heating furnace with a length of 2 meters and a temperature of 150°C for post-curing treatment. After being fully cooled by air, the rod body passes through a tractor and enters as a core wire. Plast...

Embodiment 2

[0038] Example 2: According to implementation 1, the carbon fiber in the pultrusion process is changed to high-strength glass fiber, the furnace temperature of fiber heat treatment is 100 ° C, the traction speed is 0.2 m / min, and the injection resin is changed to epoxy resin, wherein E-51: methyl tetrahydro Phthalic anhydride: DMP-30: Zinc stearate in parts by weight of 100:85:2.0:1, the pultrusion die is heated in two stages, and the temperature is 120°C and 160°C. The formed sucker rods are processed through a post-curing furnace with a temperature of 160 °C and a length of 3 m. After cooling, use a plastic extruder to continuously extrude a nylon (PA) wear-resistant layer with a thickness of 4mm within a length of 1202m to 1295m. After sufficient cooling, a fiber-reinforced composite material with a length of 73m wear-resistant layer The continuous sucker rod is wound onto a disc with a diameter of 3m. According to the needs of the oil well, when the length is 1521m, the ...

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Abstract

The invention relates to a fibre reinforced composite anti-eccentric coiled rod and a preparation device thereof. The technical scheme adopted by the invention is as follows: one or more sections of the external surface of a fibre-reinforced resin matrix composite rod body is coated with a thermoplastic wear layer; the rod body is made of one of fibreglass, carbon fibre and basalt fibre; and a resin matrix is one of epoxy resin, urethane resin and vinyl ester resin. A plastic extruder and a cooling device are arranged between a draw gear and a winding device, the plastic extruder is used for coating one thermoplastic wear layer on one or more sections of the surface of a molded sucker rod, and then the cooling device is used for performing cooling treatment, so that the fibre reinforced composite anti-eccentric coiled rod is formed. The invention has the following beneficial effects: the coiled rod has excellent anticorrosion and anti-eccentric performances; the quantity of joints is greatly reduced; the breakage probability and the piston effect are reduced; and in addition, the production efficiency is high, and the operation is simple and convenient.

Description

technical field [0001] The invention relates to a preparation method and device of oil production equipment in the petroleum industry, in particular to a fiber-reinforced 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 f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00B29C70/52B29C70/54
Inventor 崔昌瑞吴永太
Owner SHENGLI OIL FIELD XINDA PIPE IND TECH DEV CO LTD
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