CN108625794A - A kind of carbon-fiber continuous rod and its preparation facilities and method - Google Patents

Abstract

The invention discloses a carbon fiber continuous sucker rod and its preparation device and method, wherein the carbon fiber continuous sucker rod includes a carbon fiber reinforced layer, a high modulus glass fiber layer, and a fiber braided wear-resistant layer, and the high modulus glass fiber A carbon fiber reinforced layer is wrapped around the outer layer, and the fiber braided wear layer is braided around the outer high modulus glass fiber layer. The carbon fiber reinforced layer adopts continuous acrylonitrile-based carbon fiber with a longitudinal tensile modulus of more than 230GPa, and the high-modulus glass fiber layer is a high-modulus glass fiber with a longitudinal tensile modulus of more than 90GPa; Milled high modulus aramid 1414 fiber. The invention solves the problems of corrosion and eccentric wear in the production of oil fields, solves the influence of high-temperature well washing on the rod body, and solves the problem of oil production in deep wells and ultra-deep wells. Handy sucker rod.

Description

A carbon fiber continuous sucker rod and its preparation device and method

technical field

The invention relates to oil industry sucker rods, in particular to a carbon fiber continuous sucker rod and its preparation device and method.

Background technique

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 process of glass fiber reinforced thermosetting resin, which has been widely used. Complex and easy to break off and other reasons, can no longer meet the requirements of on-site production. The continuous sucker rod made of carbon fiber reinforced composite material has excellent performance in wear resistance and corrosion resistance, and has gradually become a research hotspot.

Chinese patent CN1461870 discloses a continuous sucker rod made of carbon fiber reinforced composite material and its preparation method. Carbon fiber is used as a reinforcing material, and it is integrally covered by horizontally arranged aramid fibers or ultra-high molecular weight polyethylene fiber bundles and longitudinal glass fibers. Composite, the transverse interlaminar shear strength of the sucker rod is enhanced, and the longitudinal splitting of the sucker rod in the oil well is avoided. The sucker rod adopts pultrusion and coating one-time forming processing method, and the coating layer is fiber fabric reinforced thermosetting resin, the material cost is high, and the wear resistance of the fiber fabric coating layer is poor; the cross-sectional shape of the sucker rod is rectangular or elliptical, When special equipment is used for lifting and lowering operations, the phenomenon that the rod body deviates from the clamping part is prone to occur, which limits the large-scale popularization 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 Due to defects such as poor grinding performance, it cannot meet the long-term use and operation requirements.

Contents of the invention

The purpose of the present invention is to provide a carbon fiber continuous sucker rod and its preparation device and method, mainly to solve the problems of corrosion and eccentric wear in the production of oil fields, solve the influence of high-temperature well washing on the rod body, and solve the problem of oil production in deep wells and ultra-deep wells Objective To prepare a sucker rod with good corrosion resistance and partial wear resistance, small piston effect and convenient operation.

In order to achieve the above object, the present invention adopts the following technical scheme, a carbon fiber continuous sucker rod, comprising a carbon fiber reinforced layer, a high modulus glass fiber layer, and a fiber braided wear-resistant layer, and the high modulus glass fiber layer is coated on The outer carbon fiber reinforced layer, the fiber braided wear layer is braided and wound on the outer high modulus glass fiber layer.

The carbon fiber reinforced layer adopts continuous acrylonitrile-based carbon fiber with a longitudinal tensile modulus of more than 230GPa, and the high-modulus glass fiber layer is a high-modulus glass fiber with a longitudinal tensile modulus of more than 90GPa; Milled high modulus aramid 1414 fiber.

The continuous acrylonitrile-based carbon fiber and high-modulus glass fiber should be soaked in the resin matrix glue, and the wear-resistant high-modulus aramid fiber 1414 fiber should be soaked in the multifunctional epoxy system containing wear-resistant fillers.

The cross section of the carbon fiber continuous sucker rod is circular with a diameter of 12 mm to 28 mm, and the carbon fiber reinforced layer accounts for 35% to 65% of the cross section area.

The carbon fiber reinforced layer is a closed-loop irregular corrugated structure, the number of waves is between 4 and 20, and the difference between the crest radius and the trough radius is 0.5 mm to 1 mm.

In order to achieve the above another purpose, the present invention adopts the following technical scheme, a carbon fiber continuous sucker rod preparation device, including a wire rack, a carbon fiber glue tank, a small mold, a braiding machine, and an outer layer Glue tank, pultrusion die, post-curing heating furnace, traction device, coding device, winding equipment.

Both the small mold and the pultrusion mold are provided with a mold cooling device and a mold heating device.

A preheating system is also arranged between the wire rack and the carbon fiber glue tank.

In order to achieve the above another object, the present invention adopts the following technical solution, a method for preparing a carbon fiber continuous sucker rod, which is characterized in that it comprises the following steps:

(a) Draw multiple bundles of carbon fibers from the wire rack, among which the carbon fibers used to make the carbon fiber reinforced layer and the carbon fibers used to make the high modulus glass fiber layer pass through the carbon fiber glue groove under the traction of the traction device, and soak the resin matrix glue Liquid, the resin matrix is a multi-functional epoxy resin system; then pre-cured by heating in a small mold, the heating temperature is 90-160 °C;

(b) In the small mold, the carbon fiber reinforced layer is covered with high-modulus glass fiber layer and high-strength glass fiber, and the carbon fiber used to make the fiber braided wear-resistant layer is drawn from the wire rack to make the fiber braided wear-resistant layer. Machine, use a weaving machine to weave a layer of aramid fibers on the outside of the high modulus glass fiber layer, and then enter the outer rubber tank, soak in the multifunctional epoxy system containing wear-resistant fillers, and enter the pultrusion die;

(c) The resin-impregnated fibers are cured and formed in the pultrusion die; there are mold heating devices distributed around the pultrusion die, which are heated in 3 stages, and the curing temperature is between 130 and 250 ° C, in a gradient heating mode, and the pultrusion speed is 0.10 Between m/min and 0.35m/min, pull out the composite material rod body; the pulled out composite material rod body enters the post-curing heating furnace for thermal stress treatment and post-curing;

(d) After post-curing, the composite material rod body passes through the traction device, and then the winding equipment winds it on a disc with a minimum diameter of 1.5m to 3.5m;

(e) There is a coding device between the traction device and the winding device, marking the relevant production information of the composite material rod body and not blurring or falling off during use.

Compared with the prior art, the present invention has the following beneficial effects:

The sucker rod of the present invention adds a braided layer on the basis of the carbon fiber continuous sucker rod pultrusion process. The internal corrugated structure and three-layer structure are solidified and formed at one time, which increases the contact area between the carbon fiber and the glass fiber, and improves the thickness of the layer. Inter-bonding force avoids delamination between different reinforcing materials when the rod body is torsion caused by the concentric circle structure, increases the radial and axial compressive strength, and reduces the bending diameter; the minimum bending diameter of the product is less than 60% of the cross-sectional diameter of the product times; the long-term storage bending diameter is 120 times the cross-sectional diameter of the product; the smaller diameter is convenient for transportation and storage; the outer layer uses aramid fibers and wear-resistant fillers to improve the wear resistance of the rod body.

Utilizing the preparation method provided by the present invention and adopting the combined molding process of weaving and pultrusion, the continuous stability of the continuous production of the wear-resistant and high-temperature resistant carbon fiber composite material continuous sucker rod body can be greatly improved, and the online one-time molding is guaranteed, and the production efficiency is high. High bonding strength. The use of the mold cooling device can effectively increase the fluidity of the glue, improve the infiltration effect, and increase the utilization rate of the resin.

The device of the invention realizes the method of the invention, has high production efficiency and is easy to operate.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a carbon fiber continuous sucker rod of the present invention;

Fig. 2 is the structural representation of the preparation device of the present invention;

Fig. 3 is a cross-sectional view of a carbon fiber glue tank;

Fig. 4 is the cross-sectional view of outer layer glue tank;

Fig. 5 is the cross-sectional view of small mold;

Figure 6 is a cross-sectional view of a pultrusion die;

In the figure: carbon fiber reinforced layer A, high modulus glass fiber layer B, fiber braided wear-resistant layer C;

Wire rack 1, glass fiber 1-1, carbon fiber 1-2, preheating system 2, carbon fiber glue tank 3-1, outer glue tank 3-2, small mold 4, braiding machine 5, mold cooling device 6, pull Extrusion die 7 , die heating device 8 , post-curing heating furnace 10 , traction device 11 , coding device 12 , and winding device 13 .

Detailed ways

The detailed description and technical content of the present invention are described below with the drawings, but the drawings are only for reference and description, and are not used to limit the present invention.

As shown in Figure 1, a carbon fiber continuous sucker rod is mainly composed of three layers: a carbon fiber reinforced layer A along the rod body axis, a high modulus glass fiber layer B, and a fiber braided wear-resistant layer C. The carbon fiber reinforced layer A adopts continuous acrylonitrile-based carbon fibers with a longitudinal tensile modulus of 230GPa or more, and the high-modulus glass fiber layer B is high-modulus glass fibers with a longitudinal tensile modulus of 90GPa or more; the fiber-braided wear-resistant layer of the winding layer C is wear-resistant high-modulus aramid 1414 fiber, the resin matrix is a multifunctional epoxy resin system, the Tg value of the product is the melting point between 160°C and 230°C, and the continuous length of the rod body is 200m-5000m.

The above-mentioned carbon fiber continuous sucker rod, the cross-sectional shape of the rod body is circular, the diameter is 12 mm to 28 mm, and the carbon fiber reinforced layer A accounts for 35% to 65% of the cross-sectional area; it is a closed-loop irregular corrugated structure, and the number of waves is 4 Between ～20, the difference between the crest radius and the trough radius is 0.5mm～1mm.

The preparation device of a kind of carbon fiber continuous sucker rod mentioned in the present invention comprises a wire rack 1, a preheating system 2, a carbon fiber glue tank 3-1, an outer glue tank 3-2, a small mold 4, a braiding machine 5, Mold cooling device 6, pultrusion die 7, mold heating device 8, post-curing heating furnace 10, traction device 11, coding device 12, winding equipment 13, after the carbon fiber reinforced layer A that has been preliminarily solidified after passing through the small mold 4 Coating a layer of high modulus glass fiber layer B, the outer layer uses a weaving machine 5 to weave a layer of fiber braided wear-resistant layer C; after that, it is infiltrated through the straight-through outer layer glue tank 3-2, and enters the pultrusion die 7 for curing, after curing The solidified rod body passes through the post-curing heating furnace 10, and is completely cured and formed; the cured and formed continuous sucker rod is pulled by the outside traction device 11, passes through the coding equipment 12, and then is rewound on the winding equipment 13.

According to the cross-sectional view of the carbon fiber glue groove shown in Figure 3, the glue groove is a circular structure, and the carbon fiber 1-2 enters from one side, passes through the carbon fiber glue groove filled with resin, impregnates the resin, and then enters the small mold.

According to the cross-sectional view of the outer layer glue tank in Figure 4, the outer layer glue tank is a circular structure with a straight hole in the center for the inner carbon fiber to pass through. The glass fiber 1-1 enters from one side and passes through the resin-filled The outer glue tank, impregnated with resin, and then enters the weaving machine;

According to the cross-sectional view of the small mold in Figure 5, the small mold has a rectangular shape with a polygonal hole structure inside, and the outside is heated by an electric heating plate for heating and curing of the carbon fiber layer.

According to the cross-sectional view of the pultrusion die shown in Figure 6, the pultrusion die has a rectangular shape with a circular hole structure inside, and the outside is heated by an electric heating plate for heating and curing of the carbon fiber layer.

Preheating system 2, knitting machine 5, mold cooling device 6, mold heating device 8, post-curing heating furnace 10, traction device 11, coding device 12, winding equipment 13 are all conventional prior art in this technical field, It can be installed and used directly after purchase. I won't repeat them one by one here.

A kind of preparation method of carbon fiber continuous sucker rod of the present invention is characterized in that comprising the following steps to make:

(a) A plurality of bundles of carbon fibers are drawn from the wire rack 1, wherein the carbon fiber reinforced layer A and the high modulus glass fiber layer B pass through the carbon fiber glue tank 3-1 under the traction of the traction device 11, and are soaked in the resin matrix glue solution. The resin matrix is Multi-functional epoxy resin system; pre-cured by heating in the small mold 4, and mold heating devices are distributed around the small mold, heating in two stages, and the heating temperature is 90-160°C;

(b) In the small mold, the carbon fiber reinforced layer A is covered with high-modulus glass fiber layer B and high-strength glass fiber, and the fiber braided wear-resistant layer C in the multi-bundle carbon fiber is drawn from the wire rack 1 through the braiding machine, Use the braiding machine 5 to weave a layer of fiber braided wear-resistant layer C aramid fibers outside the high-modulus glass fiber layer B, then enter the outer layer glue tank 3-2, soak in the multifunctional epoxy system containing wear-resistant fillers, and enter the drawing extrusion die 7;

(c) The resin-impregnated fibers are cured and formed in the pultrusion die 7; a mold heating device 8 is distributed around the pultrusion die 7, which is heated in three stages, and the curing temperature is between 130 and 250°C, in a gradient heating mode, and the pultrusion The speed is between 0.10m/min and 0.35m/min, and the composite material rod body is pulled out; the pulled out composite material rod body enters the post-curing heating furnace 10 for thermal stress treatment and post-curing;

(d) After post-curing, the composite material rod body passes through the traction device 11, and then the winding device 13 winds it on a disc with a minimum diameter of 1.5m to 3.5m;

(e) There is a coding device 12 between the traction device 11 and the winding device 13, which can mark the relevant production information of the composite rod body and will not blur or fall off during use.

The present invention will be described in detail below through specific examples, but the present invention is not limited to these examples.

Example 1: First, 242 bundles of T300-12K fibers are drawn from the wire drawing frame 1, and after preheating treatment, they pass through the carbon fiber glue tank 3-1 under the traction of the traction device 11, and soak in the resin matrix glue liquid, and the resin matrix is multifunctional. Epoxy resin system, the glue ratio is resin:curing agent=100:113;

The carbon fiber passes through the small mold 4 and is heated in two stages in the small mold. The temperature of the two zones is 90°C and 160°C for pre-curing;

150 bundles of WS3000-2400tex glass fibers drawn from the wire drawing frame 1 pass through the inner hole of the braiding machine 5, and enter the outer layer glue tank together with the braided layer formed by 22 pieces of 1100dtex aramid fiber 1414, and soak the resin matrix glue solution. The resin matrix is Multifunctional epoxy resin system, the glue ratio is resin: curing agent: wear-resistant filler = 100:113:5; under the traction of the tractor 11, enter the pultrusion die 7 at the same time;

The mold cooling system 6 controls the die mouth temperature at 100°C, enters the pultrusion die with a hole diameter of 22mm and heats it in three stages, the temperature is 130°C, 197°C, 250°C, the pultrusion speed is 0.19m/min, Material rod body; the extruded composite material rod body enters the post-curing heating furnace 10 for thermal stress treatment and post-curing, and the post-curing heating furnace 10 is heated in three stages at temperatures of 199°C, 135°C, and 100°C; curing becomes a three-layer structure Wear-resistant and high-temperature resistant continuous sucker rod with a diameter of 22mm; the long-term service temperature of the sucker rod is 120°C;

After post-curing, the sucker rod is pulled by the traction device 11, and after being coded by the coding device 12, it is wound on a disc with a diameter of 3.5 m by the winding device 13.

Embodiment 2: according to embodiment 1, resin is replaced with four-functional epoxy resin, improves temperature resistance, the resin in the small glue tank 3-1: curing agent=100:126, the resin in the outer layer glue tank 3-2 : curing agent: wear-resistant filler = 100:126:5, the heating temperature of the dipping device is 40°C;

The die temperature is controlled at 110°C, and the pultrusion die with a hole diameter of 22mm is heated in 7 stages, the temperature is 130°C, 230°C, 250°C, the pultrusion speed is 0.27m/min, and the composite material rod is pultruded; The rod body of the composite material that is produced enters the post-curing heating furnace 10 for thermal stress treatment and post-curing. The post-curing heating furnace 10 is heated in three stages, and the temperature is 230°C, 195°C, and 120°C; the solidification becomes a three-layer structure with a diameter of 22mm Eccentric wear-resistant carbon fiber reinforced composite continuous sucker rod; the long-term service temperature of the sucker rod is 150°C;

The sucker rod after post-curing is pulled by the pulling device 11, and is wound on a disc with a diameter of 3.5 m by the winding device 13.

The carbon fiber layer mentioned in the present invention uses irregular polygons, corrugated shapes, polygonal star structures, polygonal and multi-toothed structures and combination structures of the above shapes, which should be within the protection scope of the present invention.

The above descriptions are only some of the preferred embodiments of the present invention, and any person skilled in the art may modify the technical solutions described above or modify them into equivalent technical solutions. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention falls within the protection scope of the present invention.

Claims (9)

1. A carbon fiber continuous sucker rod, characterized in that, comprises a carbon fiber reinforced layer, a high modulus glass fiber layer, a fiber braided wear-resistant layer, and the high modulus glass fiber layer is coated on the outside of the carbon fiber reinforced layer, the The fiber braided wear layer is braided over a high modulus fiberglass layer. 2. A kind of carbon fiber continuous sucker rod according to claim 1, characterized in that, the carbon fiber reinforced layer adopts continuous acrylonitrile-based carbon fibers with a longitudinal tensile modulus of more than 230GPa, and the high-modulus glass fiber layer is longitudinally tensile. High-modulus glass fiber with a modulus of more than 90GPa; the fiber-braided wear-resistant layer of the winding layer is wear-resistant high-modulus aramid 1414 fiber. 3. A carbon fiber continuous sucker rod according to claim 2, characterized in that, the continuous acrylonitrile-based carbon fiber and the high modulus glass fiber are to be infiltrated with the resin matrix glue, and the wear-resistant high modulus aramid fiber 1414 fibers are impregnated with multifunctional epoxy systems containing wear-resistant fillers. 4. A carbon fiber continuous sucker rod according to claim 1, characterized in that, the cross-sectional shape of the carbon fiber continuous sucker rod is circular, with a diameter of 12 mm to 28 mm, and the ratio of the carbon fiber reinforced layer to the cross-sectional area is 35% to 65%. 5. A carbon fiber continuous sucker rod according to claim 4, wherein the carbon fiber reinforced layer is a closed-loop irregular corrugated structure, the number of waves is between 4 and 20, and the difference between the crest radius and the trough radius is 0.5 mm ~ 1mm. 6. A preparation device for carbon fiber continuous sucker rods, characterized in that it comprises wire racks, carbon fiber glue tanks, small molds, braiding machines, outer layer glue tanks, pultrusion dies, and post-curing Heating furnace, traction device, coding device, winding equipment. 7. The preparation device of a carbon fiber continuous sucker rod according to claim 6, wherein a mold cooling device and a mold heating device are provided on the small mold and the pultrusion mold. 8. The preparation device of a carbon fiber continuous sucker rod according to claim 6, characterized in that, a preheating system is also arranged between the wire rack and the carbon fiber glue tank. 9. A method for preparing a carbon fiber continuous sucker rod, comprising the following steps: (a) Lead out multiple bundles of carbon fibers from the wire rack, among which the carbon fibers used to make the carbon fiber reinforced layer and the carbon fibers used to make the high modulus glass fiber layer pass through the carbon fiber glue tank under the traction of the traction device, and soak the resin matrix glue Liquid, the resin matrix is a multi-functional epoxy resin system; then pre-cured by heating in a small mold, the heating temperature is 90-160 °C; (b) In the small mold, the carbon fiber reinforced layer is covered with high-modulus glass fiber layer and high-strength glass fiber, and the carbon fiber used to make the fiber-braided wear-resistant layer is drawn out from the wire rack to make the fiber-braided wear-resistant layer. Machine, use a weaving machine to weave a layer of aramid fibers on the outside of the high modulus glass fiber layer, and then enter the outer rubber tank, soak in the multifunctional epoxy system containing wear-resistant fillers, and enter the pultrusion die; (c) Fibers impregnated with resin are solidified and molded in a pultrusion die; mold heating devices are distributed around the pultrusion die, which are heated in 3 stages, and the curing temperature is between 130 and 250 ° C, in a gradient heating mode, and the pultrusion speed is 0.10 Between m/min and 0.35m/min, pull out the composite material rod body; the pulled out composite material rod body enters the post-curing heating furnace for thermal stress treatment and post-curing; (d) After post-curing, the composite material rod body enters the coding device through the traction device, and then the winding equipment winds it on a disc with a minimum diameter of 1.5m to 3.5m; (e) There is a coding device between the traction device and the winding device, marking the relevant production information of the composite rod body and not blurring or falling off during use.