阅读说明：本技术 一种混杂纤维复合材料钻杆 (Hybrid fiber composite drill rod ) 是由 朱波 张敏 曹伟伟 王强 赵大涌 朱安平 王永伟 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种混杂纤维复合材料钻杆,包括内部刚性层、中间强度层、中间抗扭层和表面耐磨层,其中,内部刚性层为混杂碳纤维多维编织结构与热固性树脂基体复合而成；中间强度层,贴合于内部刚性层外壁设置,为二维平面编织结构与热固性树脂基体复合而成；中间抗扭层,为高强度碳纤维环向缠绕结构与热固性树脂基体复合而成,设置于中间强度层的外侧；表面耐磨层,为高强度碳纤维二维平面编织叠层结构与热固性树脂基体复合而成,设置于中间抗扭层的外侧。该钻杆具有质量轻、较强的刚性、耐冲击性、耐摩擦性、高强度质量比、抗腐蚀性强、疲劳强度高以及钻杆无磁性等优点。(The invention discloses a hybrid fiber composite drill rod which comprises an internal rigid layer, an intermediate strength layer, an intermediate torsion resistant layer and a surface wear-resistant layer, wherein the internal rigid layer is formed by compounding a hybrid carbon fiber multi-dimensional woven structure and a thermosetting resin matrix; the middle strength layer is attached to the outer wall of the internal rigid layer and is formed by compounding a two-dimensional plane woven structure and a thermosetting resin matrix; the middle anti-torsion layer is formed by compounding a high-strength carbon fiber annular winding structure and a thermosetting resin matrix and is arranged on the outer side of the middle strength layer; the surface wear-resistant layer is formed by compounding a high-strength carbon fiber two-dimensional plane woven laminated structure and a thermosetting resin matrix and is arranged on the outer side of the middle anti-torsion layer. The drill rod has the advantages of light weight, strong rigidity, impact resistance, friction resistance, high strength-to-mass ratio, strong corrosion resistance, high fatigue strength, no magnetism of the drill rod and the like.)

1. A kind of mixed fiber composite material drilling rod, characterized by: comprises an internal rigid layer, an intermediate strength layer, an intermediate torsion resistant layer and a surface wear resistant layer, wherein,

the internal rigid layer is formed by compounding a hybrid carbon fiber multi-dimensional woven structure and a thermosetting resin matrix;

the middle strength layer is attached to the outer wall of the internal rigid layer and is formed by compounding a two-dimensional plane woven structure and a thermosetting resin matrix;

the middle anti-torsion layer is formed by compounding a high-strength carbon fiber annular winding structure and a thermosetting resin matrix and is arranged on the outer side of the middle strength layer;

the surface wear-resistant layer is formed by compounding a high-strength carbon fiber two-dimensional plane woven laminated structure and a thermosetting resin matrix and is arranged on the outer side of the middle anti-torsion layer.

2. The hybrid fiber composite drill pipe of claim 1, wherein: metal end heads are arranged at two ends of the hybrid fiber composite drill rod, and the drill rod is connected with the metal end heads through threads;

furthermore, a bonding cavity is arranged at the bottom of the thread of the metal end, and a resin adhesive is poured into the bonding cavity;

further, the resin adhesive is selected from one of silicone, acrylic, ABS and epoxy;

still further, at least one region of the bonding chamber extends inward of the metal end.

3. The hybrid fiber composite drill pipe of claim 1, wherein: the hybrid carbon fiber is a hybrid carbon fiber of high-strength carbon fiber and high-modulus carbon fiber;

further, the high strength carbon fiber is selected from T300, T700, T800 or T1000;

further, the high modulus carbon fiber is selected from M40, M55, or M60;

further, the hybrid carbon fiber adopts a three-dimensional four-way, three-dimensional five-way, three-dimensional six-way and three-dimensional seven-way weaving structure;

further, the thickness of the internal rigid layer is 2-4 mm.

4. The hybrid fiber composite drill pipe of claim 1, wherein: the two-dimensional plane braided structure of the middle strength layer is formed by braiding high-strength carbon fibers and high-toughness carbon fibers in a mixed manner;

further, the high strength carbon fiber is selected from T300, T700, T800 or T1000;

further, the high-tenacity carbon fibers are selected from aramid fibers or ultra-high molecular weight polyethylene fibers;

further, the two-dimensional plane weaving structure is selected from a plain, twill or satin weaving structure;

further, the thickness of the middle strength layer is 1-3 mm.

5. The hybrid fiber composite drill pipe of claim 1, wherein: in the middle anti-torsion layer, the circumferential winding angle of the carbon fiber is 5-30 degrees;

further, the thickness of the middle torsion-resistant layer is 1-3 mm.

6. The hybrid fiber composite drill pipe of claim 1, wherein: longitudinal puncture fiber stitching is adopted between the two-dimensional plane weaving laminated structures of the surface wear-resistant layer;

further, the high strength carbon fiber is selected from T300, T700, T800 or T1000;

further, the longitudinal puncture fiber is selected from aramid fiber, glass fiber or ceramic fiber;

furthermore, the usage amount of the longitudinal puncture fibers accounts for 5 to 20 percent of the total amount of the fibers of the surface wear-resistant layer;

still further, the two-dimensional planar weave structure is selected from plain, twill or satin weave.

7. The hybrid fiber composite drill pipe of claim 1, wherein: the thermosetting resin matrix of the surface wear-resistant layer is filled with rigid filler;

still further, the rigid filler is selected from silica, boron carbide, silicon carbide or boron nitride;

still further, the particle size of the rigid filler is 1-10 nm.

Still further, the filling proportion of the rigid filler is 5-15%. The filling ratio refers to the mass percentage of the rigid filler in the resin matrix of the surface wear-resistant layer.

8. The hybrid fiber composite drill pipe of claim 1, wherein: the thickness of the surface wear-resistant layer is 1-5 mm.

9. The hybrid fiber composite drill pipe of claim 1, wherein: the content of the total resin in the hybrid fiber composite drill pipe is 40-60%.

10. The hybrid fiber composite drill pipe of claim 1, wherein: the diameter of the hybrid fiber composite drill rod is 5-15 mm.

Technical Field

The invention belongs to the technical field of drill rods, and relates to a hybrid fiber composite drill rod, in particular to a thermosetting resin matrix composite drill rod with a fiber reinforced structure, which is formed by mixing carbon fibers with various different types of fibers and by winding and multi-dimensionally weaving the fibers.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Since the 21 st century, China has successfully entered the industrialized national line. With the increasing demand of resources, shallow stratum resources are gradually exhausted, and the trend of searching more resources towards the deep part of the earth becomes the development of global industry. Deep exploration faces complex working conditions such as high strength and high corrosion, and therefore higher requirements are put forward for exploration equipment and technologies, and particularly high-performance drill rods suitable for the working conditions are needed.

The types of drill rods which are widely used at present are: steel drill pipe, aluminum alloy drill pipe, sulfur-resistant drill pipe, titanium alloy drill pipe, carbon fiber composite drill pipe, etc. The steel drill rod has high yield strength and ultimate strength, good wear resistance and strong corrosion resistance, but has high density, large weight per unit length and low specific strength. Compared with the conventional rigid drill rod, the aluminum alloy drill rod has lower requirement on the load of a drilling machine, stronger drilling depth capability, lower energy consumption for tripping the drill, higher speed and stronger corrosion resistance, but weaker bending resistance, the material strength of the aluminum alloy drill rod is reduced along with the rise of the temperature, and the yield strength and the tensile strength of the material are obviously reduced relative to the room temperature. The sulfur-resistant drill rod has high strength and high hardness, has strong sensitivity to corrosive environment and is easy to corrode, so the strength of the sulfur-resistant drill rod material is greatly limited. The titanium alloy drill rod is light in weight, has high corrosion resistance and fatigue resistance, but is high in cost and limited in market.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the hybrid fiber composite material drill rod which has the advantages of light weight, strong rigidity, impact resistance, friction resistance, high strength-to-mass ratio, strong corrosion resistance, high fatigue strength, no magnetism of the drill rod and the like.

In order to achieve the purpose, the invention is realized by the following technical scheme:

in a first aspect, the present invention provides a hybrid fiber composite drill pipe comprising an inner rigid layer, an intermediate strength layer, an intermediate anti-torque layer, and a surface wear layer, wherein,

the internal rigid layer is formed by compounding a hybrid carbon fiber multi-dimensional woven structure and a thermosetting resin matrix;

the middle strength layer is attached to the outer wall of the internal rigid layer and is formed by compounding a two-dimensional plane woven structure and a thermosetting resin matrix;

the middle anti-torsion layer is formed by compounding a high-strength carbon fiber annular winding structure and a thermosetting resin matrix and is arranged on the outer side of the middle strength layer;

the surface wear-resistant layer is formed by compounding a high-strength carbon fiber two-dimensional plane woven laminated structure and a thermosetting resin matrix and is arranged on the outer side of the middle anti-torsion layer.

The drill rod is a thermosetting resin-based composite material drill rod with a winding and multi-dimensional weaving fiber reinforced structure.

The internal rigid layer is formed by compounding a hybrid carbon fiber multi-dimensional woven structure and a thermosetting resin matrix, the hybrid carbon fiber has strong mechanical property, and the composite structure of the hybrid carbon fiber multi-dimensional woven structure and the thermosetting resin matrix has strong mechanical property and strong rigidity. And part of the two-dimensional plane woven laminated structure in the middle strength layer adopts high-tenacity fibers and high-strength fibers, so that high tenacity can be obtained, high strength is also obtained, high strength is given to the drill rod, and the impact resistance of the drill rod is favorably improved.

The middle anti-torsion layer is formed by compounding a high-strength carbon fiber hoop winding structure and a thermosetting resin matrix, the high-strength carbon fiber hoop winding structure can effectively improve the circumferential tensile strength of the drill rod, and further can effectively improve the anti-torsion capacity of the drill rod.

In conclusion, the drill rod adopts a multi-layer structure design combination, and the rigidity, the impact resistance, the friction resistance and the corrosion resistance of the rod body of the drill rod are improved. The composite drill rod can reduce the dead weight, improve the comprehensive mechanical property of the composite rod body under the working condition of the underground deep well, and ensure the use stability and the service life of equipment for drilling work.

In some embodiments, the two ends of the hybrid fiber composite drill rod are further provided with metal ends, and the drill rod is connected with the metal ends through threads.

The both ends of the rod body are connected with the composite material rod body and the metal end in a splicing manner through threads, the metal end of the drill rod ensures continuous length connection between the composite material drill rods, and the continuous stability of the long drill rod is improved so as to meet the requirements of the long drill rods with different drilling depths.

Furthermore, a bonding cavity is arranged at the bottom of the thread of the metal end, and resin adhesive is poured into the bonding cavity.

Further, the resin binder is selected from one of silicone, acrylic, ABS and epoxy.

Still further, at least one region of the bonding chamber extends inward of the metal end.

The drill rod body is connected with the metal end head through threads, the end part of the drill rod body is bonded with the inside of the metal end head through a resin adhesive, and the drill rod body can be firmly connected with the metal end head under the dual effects of the threaded connection and the resin adhesive bonding.

At least one area of the bonding cavity extends towards the interior of the metal end head, so that the bonding agent can be filled into the interior of the metal end head, and the bonding strength of the drill rod body is further improved.

In some embodiments, the hybrid carbon fiber is a hybrid carbon fiber of a high strength carbon fiber and a high modulus carbon fiber.

Further, the high strength carbon fiber is selected from T300, T700, T800 or T1000.

Further, the high modulus carbon fiber is selected from M40, M55 or M60.

Further, the hybrid carbon fiber adopts a three-dimensional four-way, three-dimensional five-way, three-dimensional six-way and three-dimensional seven-way weaving structure.

Further, the thickness of the internal rigid layer is 2-4 mm.

In some embodiments, the two-dimensional planar braided structure of the intermediate strength layer is formed by braiding a mixture of high-strength carbon fibers and high-tenacity carbon fibers.

Further, the high strength carbon fiber is selected from T300, T700, T800 or T1000.

Further, the high-tenacity carbon fibers are selected from aramid fibers or ultra-high molecular weight polyethylene fibers.

Further, the two-dimensional planar weave structure is selected from a plain, twill or satin weave structure.

Further, the thickness of the middle strength layer is 1-3 mm.

In some embodiments, the intermediate torque resistant layer has a carbon fiber hoop wind angle of 5 ° to 30 °. The circumferential winding angle is an included angle with the axial direction of the drill rod.

Further, the thickness of the middle torsion-resistant layer is 1-3 mm.

In some embodiments, longitudinal puncture fiber stitching is used between the two-dimensional planar woven laminations of the surface abrasion resistant layer. Longitudinal puncture fiber stitching is adopted to improve the bonding strength between layers.

Further, the high strength carbon fiber is selected from T300, T700, T800 or T1000.

Further, the longitudinal penetrating fiber is selected from aramid fiber, glass fiber or ceramic fiber.

Furthermore, the amount of the longitudinal puncture fibers accounts for 5 to 20 percent of the total amount of the fibers of the surface wear-resistant layer.

Still further, the two-dimensional planar weave structure is selected from plain, twill or satin weave.

Furthermore, the thermosetting resin matrix of the surface wear-resistant layer is filled with rigid filler.

Still further, the rigid filler is selected from silica, boron carbide, silicon carbide or boron nitride.

Still further, the particle size of the rigid filler is 1-10 nm.

Still further, the filling proportion of the rigid filler is 5-15%. The filling ratio refers to the mass percentage of the rigid filler in the resin matrix of the surface wear-resistant layer.

Furthermore, the thickness of the surface wear-resistant layer is 1-5 mm.

In some embodiments, the hybrid fiber composite drill pipe has a total resin content of 40% to 60%.

In some embodiments, the hybrid fiber composite drill rod has a diameter of 5-15 mm.

The above one or more embodiments of the invention achieve the following advantageous effects:

1. the drill rod body is designed and combined in a multilayer structure, so that the rigidity, impact resistance, friction resistance and corrosion resistance of the drill rod body are effectively improved.

2. The metal joint is adopted to connect the two ends of the drill rod body, so that the stable connection between the drill rods is effectively ensured to meet the requirements of the large-length drill rods with different drilling depths.

3. The carbon fiber is mixed with various fibers of different types, and the two fibers are matched, so that the performance of the composite material is effectively enhanced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic overall structural view of a composite drill pipe of a multilayer composite construction of a hybrid design of multiple fiber windings and braids in accordance with one or more embodiments of the present invention;

FIG. 2 is an enlarged partial view of a composite drill pipe of a multilayer composite construction of a hybrid multiple fiber winding and braiding design according to one or more embodiments of the present invention.

In the figure, 1, an internal rigid layer, 2, an intermediate strength layer, 3, an intermediate torsion resistant layer, 4 and a surface wear resistant layer.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Example 1

The internal rigid layer is formed by mixing T700 high-strength carbon fibers and M40 high-modulus carbon fibers in a mixing ratio of 1: 1, weaving by adopting a three-dimensional four-way weaving structure, compounding urea-formaldehyde resin, and enabling the total thickness to be 3 mm. The middle strength layer adopts T700 high strength carbon fiber and aramid fiber 1: 1 hybrid weaving, adopting a two-dimensional plain weave structure, compounding urea-formaldehyde resin, and enabling the total thickness to be 2.5 mm. The middle anti-torsion layer is wound by T800 carbon fiber at a 30-degree annular winding angle and impregnated and compounded by urea-formaldehyde resin, and the total thickness is 2 mm. The surface wear-resistant layer adopts T1000 high strength carbon fiber to carry out two-dimentional plain weave, adopts aramid fiber to weave the laminated structure in two dimensions and carries out vertical puncture, and the two proportion is 5: 1. the surface wear-resistant layer matrix resin is urea-formaldehyde resin, the internal rigid filler is 5nm silica ultrafine powder, and the proportion of the urea-formaldehyde resin to the internal rigid filler is 9: 1, the thickness of the final surface wear-resistant layer is 4 mm.

The total resin matrix content of the four laminated combined parts is 50%, and the rod body thickness of the composite drill rod is 11.5 mm.

The rod body of the drill rod is combined with the metal end head in a combined connection mode of glue joint and mechanical connection, and the metal end head is internally provided with threads for stable connection and combination of continuous lengths between the rod bodies. The joint of the rod body and the metal end is provided with an L-shaped structural design with a certain length, and an organic silicon adhesive is filled and sealed inside the L-shaped structural design.

Example 2

The internal rigid layer is formed by mixing T800 high-strength carbon fibers and M55 high-modulus carbon fibers in a mixing ratio of 2: 1, weaving by adopting a three-dimensional five-direction weaving structure, compounding unsaturated polyester resin, and enabling the total thickness to be 3 mm. The middle strength layer adopts T800 high strength carbon fiber and ultra-high molecular weight polyethylene fiber 2: 1 hybrid weaving, adopting two-dimensional twill weaving structure, unsaturated polyester resin carries out the complex, and the total thickness is 2 mm. The middle anti-torsion layer is wound by adopting T700 carbon fiber at a 20-degree annular winding angle and is matched with unsaturated polyester resin for impregnation and compounding, and the total thickness is 2 mm. The surface wear layer adopts T800 high strength carbon fiber to carry out two-dimensional twill weaving, adopts glass fiber to weave the laminated structure in two-dimensional and carries out vertical puncture, and the two proportion is 6: 1. unsaturated polyester resin is selected as matrix resin of the surface wear-resistant layer, 6nm boron carbide superfine powder is adopted as internal rigid filler, and the proportion of the unsaturated polyester resin to the internal rigid filler is 8: 1, the thickness of the final surface wear-resistant layer is 3 mm.

The total resin matrix content of the four laminated combined parts is 55%, and the rod body thickness of the composite material drill rod is 10 mm.

The rod body of the drill rod is combined with the metal end head in a combined connection mode of glue joint and mechanical connection, and the metal end head is internally provided with threads for stable connection and combination of continuous lengths between the rod bodies. The joint of the rod body and the metal end is provided with an L-shaped structural design with a certain length, and acrylic acid adhesive is filled and sealed inside the L-shaped structural design.

Example 3

The internal rigid layer is formed by mixing T300 high-strength carbon fibers and M60 high-modulus carbon fibers in a mixing ratio of 1: 2, weaving by adopting a three-dimensional five-direction weaving structure, and compounding with epoxy resin, wherein the total thickness is 2 mm. The middle strength layer adopts T700 high strength carbon fiber and ultra-high molecular weight polyethylene fiber 1: 1 hybrid weaving, adopting a two-dimensional satin weaving structure, compounding with epoxy resin, and enabling the total thickness to be 2 mm. The middle anti-torsion layer is wound by T800 carbon fibers at a 15-degree annular winding angle and is compounded by epoxy resin impregnation, and the total thickness is 2 mm. The surface wear-resistant layer adopts T1000 high strength carbon fiber to carry out two-dimensional plain weave, adopts ceramic fiber to weave the laminated structure in two-dimensional and carries out vertical puncture, and the two proportion is 9: 1. the surface wear-resistant layer matrix resin is epoxy resin, the internal rigid filler is 7nm silicon carbide superfine powder, and the proportion of the two is 10: 1, the thickness of the final surface wear-resistant layer is 2 mm.

The total resin matrix content of the four laminated combined parts is 45%, and the rod body thickness of the composite material drill rod is 8 mm.

The rod body of the drill rod is combined with the metal end head in a combined connection mode of glue joint and mechanical connection, and the metal end head is internally provided with threads for stable connection and combination of continuous lengths between the rod bodies. The joint of the rod body and the metal end is provided with an L-shaped structural design with a certain length, and epoxy resin adhesive is filled and sealed inside the L-shaped structural design.

Example 4

The internal rigid layer is formed by mixing T1000 high-strength carbon fibers and M55 high-modulus carbon fibers, wherein the mixing ratio of the two is 3: 2, weaving by adopting a three-dimensional six-direction weaving structure, and compounding by using phenolic resin, wherein the total thickness is 2 mm. The middle strength layer adopts T800 high strength carbon fiber and aramid fiber 3: 1 hybrid weaving, adopting two-dimensional twill weaving structure, phenolic resin carries out the complex, and total thickness is 2 mm. The middle anti-torsion layer is wound by adopting T700 carbon fiber at a 10-degree annular winding angle and is compounded by being impregnated with phenolic resin, and the total thickness is 2 mm. The surface wear-resistant layer adopts T1000 high strength carbon fiber to carry out two-dimensional plain weave, adopts glass fiber to weave the laminated structure in two-dimensional and carries out vertical puncture, and the two proportion is 9: 1. the surface wear-resistant layer matrix resin is phenolic resin, the internal rigid filler is 5nm silica ultrafine powder, and the proportion of the two is 9: 1, the thickness of the final surface wear-resistant layer is 3 mm.

The total resin matrix content of the four laminated combined parts is 50%, and the rod body thickness of the composite material drill rod is 9 mm.

The rod body of the drill rod is combined with the metal end head in a combined connection mode of glue joint and mechanical connection, and the metal end head is internally provided with threads for stable connection and combination of continuous lengths between the rod bodies. The joint of the rod body and the metal end is provided with an L-shaped structural design with a certain length, and an organic silicon adhesive is filled and sealed in the rod body.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.