Manufacturing method of glass fiber reinforced plastic pipe for containing and protecting rock core for drilling and glass fiber reinforced plastic pipe

Abstract

The invention belongs to the field of drilling, and particularly relates to a manufacturing method of a glass reinforced plastic pipe for containing and protecting a rock core for drilling and the glass reinforced plastic pipe. Comprising the following steps that a lining layer is manufactured, wherein a first resin composition is fully permeated into a surfacing mat on the surface of the lining layer, so that the roughness coefficient of the inner surface of the lining layer is smaller than or equal to 0.000084; a structural layer is manufactured, wherein the lining layer is wrapped with a second resin composition; the glass steel pipe is obtained. The inner surface of the glass reinforced plastic pipe manufactured by the method is extremely smooth, the resistance is extremely small when liquid flows, scaling is not easy to occur, and the coring quality and the core yield are improved.

Description

Technical Field

[0001] The present invention belongs to the field of drilling, and particularly relates to a manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling and the glass steel pipe. Background Art

[0002] Fiberglass Reinforced Plastic (FRP), that is, fiber-reinforced plastic, generally refers to using glass fibers to reinforce unsaturated polyester, epoxy resin or vinyl resin matrix. The reinforced plastic with glass fibers or their products as the reinforcing material is called glass fiber reinforced plastic, or FRP. Due to the different types of resins used, it is also divided into polyester FRP, epoxy FRP, vinyl FRP, phenolic FRP, etc. It is light in weight and hard, non-conductive, corrosion-resistant, and has high mechanical strength, and can replace steel to manufacture pipelines, machine parts or car shells, etc.

[0003] Chinese Patent: CN104325653B discloses a glass steel pipe and its continuous manufacturing method, including the following steps: (1) Wrap the surface of the mandrel with chopped strand mat, then use the first resin composition to fully penetrate the chopped strand mat, and then use glass fibers to weave on the surface of the chopped strand mat to form a leak-proof layer; (2) Wind glass fibers on the leak-proof layer obtained in step (1) and infiltrate with the second resin composition, and repeat several times to obtain a semi-finished product; (3) Heat the semi-finished product obtained in step (2) for curing and molding, and then demold to obtain the glass steel pipe. This glass steel pipe has high strength, good pressure resistance, can effectively prevent leakage, and the manufacturing method is more environmentally friendly.

[0004] However, when this glass steel pipe is used as the core sampling pipe commonly used at the drilling site, there are situations of core jamming and core abrasion, which thus seriously affect the core sampling quality and core recovery rate.

[0005] In view of this, the present invention is specifically proposed. Summary of the Invention

[0006] The present application discovers that the reasons for core jamming and core abrasion are that the inner surface of the steel pipe in the prior art has poor smoothness and a large friction coefficient. Since the muddy part in the core swells when encountering water, the core will jam and abrade due to excessive resistance to core movement, seriously affecting the core sampling quality and core recovery rate.

[0007] In order to solve the technical problems existing in the prior art, the present invention provides a manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling and the glass steel pipe. The inner surface of the glass steel pipe manufactured by the method of the present invention is extremely smooth, the resistance during liquid flow is extremely small, and it is not easy to scale, improving the core sampling quality and core recovery rate.

[0008] The present invention includes the following technical solutions:

[0009] This embodiment provides a manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling, including the following steps:

[0010] Manufacture of the inner lining layer: The surface of the inner lining layer is a surface mat fully infiltrated with the first resin composition, so that the roughness coefficient of the inner surface of the inner lining layer ≤ 0.000084;

[0011] Manufacture of the structural layer: Wrap the second resin composition outside the inner lining layer;

[0012] Obtain the glass steel pipe.

[0013] Furthermore, the first resin composition includes the following components in parts by weight: 100 parts of unsaturated polyester resin, 1 - 2 parts of curing agent, and 0.1 - 0.3 part of accelerator.

[0014] Furthermore, the second resin composition includes the following components in parts by weight: 100 parts of unsaturated polyester resin, 2 - 3 parts of curing agent, and 0.3 - 0.5 part of accelerator.

[0015] Furthermore, the second resin composition is wound around the inner lining layer by a winding machine.

[0016] Furthermore, the manufacture of the inner lining layer includes the following steps:

[0017] Wrap corrugated paper on the surface of the core mold, wrap a film outside the corrugated paper, wrap a surface mat outside the film, use the first resin composition to fully infiltrate the surface mat, wrap an alkali - free glass fiber tape outside the surface mat fully infiltrated with the first resin composition, and then use the first resin composition to fully infiltrate the alkali - free glass fiber tape, and heat - cure to obtain the inner lining layer.

[0018] Furthermore, the film is a polyester film.

[0019] Furthermore, the time for the first resin composition to infiltrate the surface mat is: 2 - 3 min.

[0020] Furthermore, after the manufacture of the structural layer is completed, heat the outer surface of the structural layer; preferably, the heating temperature is 100 - 120 °C.

[0021] Furthermore, after the manufacture of the structural layer is completed, grind and correct the outer surface of the structural layer to obtain the glass steel pipe.

[0022] This embodiment also provides a glass steel pipe for accommodating and protecting cores in drilling, which is manufactured by using the above - mentioned method.

[0023] Adopting the above - mentioned technical solution, the present invention has the following advantages:

[0024] 1. The inner surface of the glass steel pipe manufactured by the method of the present invention is extremely smooth, with extremely small resistance during liquid flow, not prone to scaling, and improves the coring quality and core recovery rate.

[0025] 2. The roughness coefficient of the inner surface of the glass steel pipe manufactured by the present invention is ≤ 0.000084, and it also has excellent corrosion resistance and hydrodynamic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a flowchart of a manufacturing method of a glass steel pipe for accommodating and protecting cores in a drilling operation according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic structural diagram of a winding machine according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to concisely express the present invention, and they are only examples and not intended to limit the present invention.

[0030] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0032] This embodiment provides a manufacturing method of a glass steel pipe for accommodating and protecting cores in a drilling operation, including the following steps:

[0033] Inner liner layer production: The surface of the inner liner layer is a surface mat fully infiltrated with the first resin composition, such that the roughness coefficient of the inner surface of the inner liner layer ≤ 0.000084;

[0034] Structural layer production: Wrap the second resin composition around the outer surface of the inner liner layer;

[0035] Obtain a glass fiber pipe.

[0036] The combination method of the inner liner layer and the first resin composition enables the roughness coefficient of the inner surface of the inner liner layer ≤ 0.000084; In order to make the roughness coefficient of its inner surface smaller, during the manufacturing process, a film can also be wrapped around the core mold.

[0037] Furthermore, the first resin composition includes the following components in parts by weight: 100 parts of unsaturated polyester resin, 1 - 2 parts of curing agent, and 0.1 - 0.3 parts of accelerator. With such components, the first resin composition can ensure good fluidity and good formability on the basis of ensuring good fluidity, and its fluidity can ensure its uniform infiltration of the surface mat, so that the finally obtained inner liner layer can meet the roughness requirements. Specifically, it includes 100 parts of unsaturated polyester resin, 1 part of curing agent, and 0.1 part of accelerator; includes 100 parts of unsaturated polyester resin, 2 parts of curing agent, and 0.3 part of accelerator; includes 100 parts of unsaturated polyester resin, 1 part of curing agent, and 0.3 part of accelerator; includes 100 parts of unsaturated polyester resin, 2 parts of curing agent, and 0.1 part of accelerator, etc. Of course, the examples are not limited to this.

[0038] Furthermore, the second resin composition includes the following components in parts by weight: 100 parts of unsaturated polyester resin, 2 - 3 parts of curing agent, and 0.3 - 0.5 parts of accelerator. Specifically, 100 parts of unsaturated polyester resin, 2 parts of curing agent, and 0.3 part of accelerator; 100 parts of unsaturated polyester resin, 3 parts of curing agent, and 0.5 part of accelerator; 100 parts of unsaturated polyester resin, 2 parts of curing agent, and 0.5 part of accelerator; 100 parts of unsaturated polyester resin, 3 parts of curing agent, and 0.3 part of accelerator, etc. Of course, the examples are not limited to this.

[0039] Furthermore, the second resin composition is wound around the inner liner layer by a winding machine.

[0040] Furthermore, the production of the inner liner layer includes the following steps:

[0041] Wrap corrugated paper on the surface of the core mold, wrap a film outside the corrugated paper, wrap a surface mat outside the film, use the first resin composition to fully infiltrate the surface mat, wrap an alkali - free glass fiber tape outside the surface mat fully infiltrated with the first resin composition, and then use the first resin composition to fully infiltrate the alkali - free glass fiber tape, and heat - cure to obtain the inner liner layer.

[0042] Corrugated paper and a film are arranged outside the core mold, which not only makes it easier to demold the inner liner layer, but also makes the roughness coefficient smaller.

[0043] Furthermore, the film is a polyester film.

[0044] Furthermore, the time for the first resin composition to penetrate the surface mat is: 2 - 3 min. By controlling the time, while ensuring that the first resin composition fully penetrates the surface mat, the processing efficiency is improved.

[0045] Furthermore, after the structure layer is manufactured, the outer surface of the structure layer is heated; preferably, the heating temperature is 100 - 120 °C.

[0046] Furthermore, after the structure layer is manufactured, the outer surface of the structure layer is ground and corrected to obtain a glass steel pipe.

[0047] Based on the method of the above embodiments, as Figure 1 shown below is the manufacturing method of a glass steel pipe with a specification of ф125×5240 mm for drilling to accommodate and protect cores:

[0048] Material preparation: Receive the required raw materials (resin, winding yarn, surface mat, fiberglass cloth, glass fiber tape, etc.) according to the caliber required by the process; set the process control parameters of the product; thread the specified number of yarn strands as required by the process and arrange the width of the yarn sheet; receive auxiliary materials such as release wax, polyester film, and adhesive tape according to the process requirements.

[0049] Core mold preparation: Select a core mold with a suitable outer diameter according to the process requirements. The surface of the mold must be cleaned, waxed several times, air-dried, and polished to be smooth and flat; wrap several layers of corrugated paper with a thickness of 2.5 mm on the surface of the mold, and the outer diameter dimension reaches the inner diameter requirement dimension of the casing; (the corrugated paper should be wrapped tightly, with a joint gap of 1 - 2 mm, and the butt joint of two pieces of corrugated paper is overlapped with a flat paper by about 10 mm to prevent the appearance of annular grooves); wrap two layers of polyester film with a width of 100 mm, and the overlap width of each layer of film is 15 - 20 mm, without looseness; install the steel part joints in the direction of film winding; slowly rotate and push inward to prevent the film from loosening and wrinkling. One end of the joint is 300 mm away from the end of the mold, and the other end is measured while on the side of the joint to make the distance between the outer ends of the two joints reach the length requirement of the fiberglass core casing, and then fix the two joints.

[0050] Inner lining production: Wrap a surface mat with a width of 100 mm outside the polyester film, with a lap width of 5 - 10 mm, and then apply a layer of the first resin composition to evenly impregnate the surface mat with resin; at this time, a primary heat curing can be carried out first to avoid affecting the roughness coefficient of the inner surface of the surface mat during subsequent operations; wind a 4700 mm × 900 mm R02 alkali-free fiberglass cloth outside the surface mat that has been fully penetrated by the first resin composition, wrap two layers of R02 alkali-free fiberglass tapes with a width of 200 mm, and finally use a squeegee to level it and expel air bubbles, and then use the first resin composition to impregnate the alkali-free fiberglass tapes until fully penetrated; lift the mold with the inner lining made to the curing station for heat curing.

[0051] Structural layer production: As Figure 2 shown, lift the mold with the cured inner lining to the winding machine and fix it, and remove the surface burrs and resin bumps; inject the second resin composition into the resin tank of the trolley, that is, 6000 g of A400 - 972 unsaturated polyester resin, 120 g of M - 50VR curing agent, and 18 g of T - 8C accelerator.

[0052] Adjust the starting position, set up the yarn, calculate the laying process according to the required value of the outer diameter of the fiberglass pipe, set the auxiliary layer process on the winding microcomputer, and carry out winding, with the speed controlled by the microcomputer of the winding equipment; during the winding process, timely remove wool and yarn clusters, and control the scraping force of the glue; after winding, measure the outer circumference of the fiberglass pipe at three points to see if it is within the required range. After passing, evenly wrap a layer of polyester film with a width of 100 mm, with a lap width of 15 - 20 mm, and lift it to the curing station for heat curing; after the fiberglass pipe is cured, immediately turn off the heating lamp to prevent the fiberglass pipe from shrinking in length. Lift the cured pipe with the mold to the demolding machine, fix the pipe with a clamping plate, and use a hydraulic cylinder at the tail end to push the mold out by 1000 mm, and use a tractor to pull out the mold; place the removed fiberglass pipe flat in the semi-finished product area to prevent deformation.

[0053] Grinding and trimming: First, cut off the fiberglass layer wound on the outer circle of the steel part joints at both ends of the fiberglass pipe and remove the cut-off fiberglass; grind the excess parts at both ends of the fiberglass pipe to the outer diameter size of the steel part joints without producing a second platform; use an angle grinder to trim the outer circumference size of the pipe to within the required outer diameter size range, clean the residual fiberglass and impurities on the steel part joints, and trim the polished part smooth and flat with 100-mesh fine sandpaper; clean the grinding part of the fiberglass pipe with a brush dipped in acetone, without any oil stains, rust, dust or other impurities, evenly apply a thin layer of resin on the grinding part with the prepared resin, without producing running glue or glue particles, and place it flat to cure; after complete curing, conduct inspections according to the factory inspection standards. After passing the inspection, attach a certificate of conformity, and wrap the outside of the fiberglass pipe with corrugated paper and place it flat to prevent the pipe body from being bruised or scratched.

[0054] The roughness coefficient of the glass steel pipe with a specification of ф125×5240mm for accommodating and protecting cores in drilling is 0.000084. The detection of various properties is shown in Table 1 and Table 2. It can be seen from this that the inner and outer diameter dimensions and mechanical properties of the glass steel pipe for accommodating and protecting cores in drilling can fully meet the usage requirements during the drilling process.

[0055] Table 1 Comparison Table of Dimension Detection Data

[0056] Specification Length Length Deviation Outer Diameter Outer Diameter Deviation Wall Thickness Wall Thickness Deviation DN125 5240 ±3 141 ±1 8 ±0.3

[0057] Table 2 Comparison Table of Performance Detection Data

[0058] Serial Number Inspection Item Standard Requirement Measured Value 1 Resin Content 17％～25％ 18 2 Insoluble Resin Content Not Less Than 80% 95 3 Barcol Hardness Not Lower Than 40 60 4 Axial Tensile Property Not Lower Than 50kN 65

[0059] This embodiment also provides a glass steel pipe for accommodating and protecting cores in drilling, which is manufactured by using the above method.

[0060] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling, characterized in that, It includes the following steps: Inner liner layer production: The surface of the inner liner layer is fully penetrated by the surface mat with the first resin composition, so that the roughness coefficient of the inner surface of the inner liner layer ≤ 0.000084; Structural layer production: Wrap the second resin composition outside the inner liner layer; Obtain a glass steel pipe.

2. The manufacturing method of a glass steel pipe for accommodating and protecting core used in drilling according to claim 1, characterized in that, The first resin composition includes the following components in parts by weight: 100 parts of unsaturated polyester resin, 1 - 2 parts of curing agent, and 0.1 - 0.3 parts of accelerator.

3. The manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling, as described in claim 1 or 2, is characterized in that The second resin composition includes the following components in parts by weight: 100 parts of unsaturated polyester resin, 2 - 3 parts of curing agent, and 0.3 - 0.5 parts of accelerator.

4. The manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling as described in claim 3, characterized in that, The second resin composition is wound on the inner liner layer by a winding machine.

5. The manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling, as described in claim 1 or 2, is characterized in that, The production of the inner liner layer includes the following steps: Wrap corrugated paper on the surface of the core mold, wrap a film outside the corrugated paper, wrap a surface mat outside the film, use the first resin composition to fully penetrate the surface mat, wrap an alkali - free glass fiber tape outside the surface mat that has been fully penetrated by the first resin composition, and then use the first resin composition to fully penetrate the alkali - free glass fiber tape, and heat - cure to obtain the inner liner layer.

6. The manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling as claimed in claim 5, characterized in that, The film is a polyester film.

7. The manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling as described in claim 5, characterized in that, The time for the first resin composition to penetrate the surface mat is: 2 - 3 min.

8. The manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling, as described in claim 1, is characterized in that, After the production of the structural layer is completed, heat the outer surface of the structural layer; preferably, the heating temperature is 100 - 120 °C.

9. The manufacturing method of a glass steel pipe for accommodating and protecting cores in drilling as claimed in claim 1 or 8, characterized in that, After the production of the structural layer is completed, grind and correct the outer surface of the structural layer to obtain a glass steel pipe.

10. A glass steel pipe for accommodating and protecting cores in drilling, characterized in that, Manufactured by using the method according to any one of claims 1 - 9.

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