Drill rod wound with polyphenylene sulfide film

Abstract

The utility model relates to the field of drill rods for oil and gas exploitation, and discloses a drill rod wound with a polyphenylene sulfide (PPS) film, the polyphenylene sulfide (PPS) film is wound on the rod part of the drill rod, so that the surface of the rod part is provided with a protective layer, and the protective layer can form an isolation barrier to prevent direct contact and permeation of hydrogen sulfide and a metal matrix. Therefore, the occurrence probability of hydrogen sulfide corrosion reaction is reduced; besides, the surface of the PPS film is smooth, and due to the excellent wear resistance and mechanical strength, the PPS film can bear mechanical impact and friction in the drilling process, the overall protection effect of the drill rod is enhanced, corrosion of hydrogen sulfide to the surface of the rod part and permeability damage to the interior of the rod part are further reduced, and therefore the service life of the drill rod is remarkably prolonged.

Description

Technical Field

[0001] The utility model relates to the field of drill rods for oil and gas development, and discloses a drill rod wound with a polyphenylene sulfide film. Background Art

[0002] Hydrogen sulfide corrosion is one of the most severe and dangerous forms of metal corrosion in the oil and gas industry. Through complex electrochemical reactions, it causes surface corrosion and permeability damage in drill pipes in harsh environments such as high temperature and high pressure. This not only significantly weakens the mechanical strength and corrosion resistance of metal materials but also triggers the formation and expansion of microcracks, posing a significant threat to the safety and reliability of drilling equipment. Utility Model Content

[0003] The purpose of the utility model is to provide a drill rod wrapped with a polyphenylene sulfide film, which can reduce the corrosion of hydrogen sulfide on the rod surface and the permeability damage inside, thereby significantly improving the service life of the drill rod.

[0004] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0005] A drill rod wrapped with a polyphenylene sulfide film comprises a rod portion, one end of the rod portion is provided with a first connector, the other end of the rod portion is provided with a second connector, the first connector of the rod portion is used to coaxially cooperate with the second connector of an adjacent section of drill rod, and the second connector is used to coaxially cooperate with the first connector of an adjacent section of drill rod; the outer wall of the rod portion is wrapped with a polyphenylene sulfide film.

[0006] Furthermore, the polyphenylene sulfide film is spirally wound on the rod along the length direction of the rod.

[0007] Furthermore, the polyphenylene sulfide film on the rod is spirally wound around the outer wall of the rod starting from a position close to the first connector, and the winding direction is opposite to the rotation direction of the drill rod during drilling.

[0008] Furthermore, the overlapping length between adjacent turns of the polyphenylene sulfide film layer is 0.2 to 0.6 times the diameter of the rod.

[0009] Furthermore, an adhesive layer is provided between the outer wall of the rod and the wrapped polyphenylene sulfide film.

[0010] Furthermore, the first connecting head is a threaded head with external threads, and the second connecting head is a female thread that can cooperate with the threaded head.

[0011] Furthermore, an expanded diameter section is provided at the end of the rod corresponding to the female thread, and a sealing groove is coaxially provided along the outer wall of the rod at the end of the expanded diameter section facing the first connector, and the tail end of the polyphenylene sulfide film extends into the sealing groove, and the sealing groove is filled with potting glue for fixing the polyphenylene sulfide film.

[0012] Furthermore, the thickness of the polyphenylene sulfide is 0.05 to 0.3 times the diameter of the drill rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects: by wrapping a polyphenylene sulfide film around the rod portion of the drill pipe, the present invention provides a protective layer on the rod surface. This protective layer can form an isolation barrier to prevent direct contact and penetration of hydrogen sulfide with the metal matrix, thereby reducing the probability of hydrogen sulfide corrosion reaction; and can further reduce the corrosion of hydrogen sulfide on the rod surface and the permeability damage inside, thereby significantly improving the service life of the drill pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the drill rod structure wrapped with polyphenylene sulfide film in the embodiment;

[0015] Figure 2 for Figure 1 A magnified schematic diagram of part A in the middle;

[0016] Among them, 1. rod; 2. first connector; 3. second connector; 4. polyphenylene sulfide film; 5. expanded diameter section; 6. end sealing groove; 7. overlap portion. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments. All technologies implemented based on the present invention fall within the scope of the present invention.

[0018] Example

[0019] See also Figure 1-Figure 2 A drill rod wrapped with a polyphenylene sulfide film includes a rod portion 1, a first connector 2 is provided at one end of the rod portion 1, and a second connector 3 is provided at the other end of the rod portion 1. The first connector 2 of the rod portion 1 is used to coaxially cooperate with the second connector 3 of an adjacent section of the drill rod, and the second connector 3 is used to coaxially cooperate with the first connector 2 of an adjacent section of the drill rod; the outer wall of the rod portion 1 is wrapped with a polyphenylene sulfide film 4.

[0020] In this embodiment, polyphenylene sulfide has excellent chemical corrosion resistance, high temperature resistance, and mechanical strength, and can remain stable in extreme environments. By wrapping a polyphenylene sulfide (PPS) film around the drill pipe's rod portion 1, a protective layer is formed on the surface of the rod portion 1. This protective layer can form an isolation barrier, preventing direct contact and penetration of hydrogen sulfide with the metal substrate, thereby reducing the probability of hydrogen sulfide corrosion reactions. In addition, the smooth surface of the PPS film, and its excellent wear resistance and mechanical strength also enable it to withstand mechanical impact and friction during the drilling process, enhancing the overall protective effect of the drill pipe, further reducing hydrogen sulfide corrosion on the surface of the rod portion 1 and internal permeability damage, thereby significantly improving the service life of the drill pipe.

[0021] The drill pipe wrapped with the polyphenylene sulfide film 4 in this embodiment not only reduces the maintenance and replacement costs of the equipment, but also improves the safety and efficiency of drilling operations, providing an efficient and economical solution for hydrogen sulfide corrosion protection.

[0022] In this embodiment, the polyphenylene sulfide film 4 is spirally wound on the rod 1 along the length direction of the rod 1. It should be noted that there are many ways to wind the rod in a spiral shape, which can be wound in the same direction as the rotation direction of the drill rod during drilling, or in the opposite direction to the rotation direction of the drill rod during drilling. In order to reduce the impact of mud on the polyphenylene sulfide film 4 during drilling and prevent the polyphenylene sulfide film 4 from becoming loose, the polyphenylene sulfide film 4 on the rod 1 in this embodiment starts from a position close to the first connector 2 and is spirally wound on the outer wall of the rod 1, and the winding direction is the same as the rotation direction of the drill rod during drilling ( Figure 1 (direction of rotation arrow in the figure).

[0023] In this embodiment, the overlapping length between adjacent turns of the polyphenylene sulfide film 4 is 0.2 to 0.6 times the diameter of the rod 1. When winding, the polyphenylene sulfide film 4 between adjacent turns overlaps each other to form an overlapping portion 7. Figure 1 and Figure 2 As shown, the dashed line represents the edge of the polyphenylene sulfide film 4 wrapped inside. The overlap 7 further ensures the protective effect of the polyphenylene sulfide film 4 on the drill pipe, preventing corrosion of the drill pipe caused by localized wear of the polyphenylene sulfide film 4. In this embodiment, the thickness of the polyphenylene sulfide film 4 is 0.05 to 0.3 times the diameter of the drill pipe, and the thickness of the wrapped polyphenylene sulfide film 4 can be adjusted according to actual geological conditions.

[0024] In order to further enhance the adhesion effect between the polyphenylene sulfide and the rod 1 , an adhesive layer is further provided between the outer wall of the rod 1 and the wrapped polyphenylene sulfide film 4 in this embodiment.

[0025] Similar to the conventional drill pipe, the first connector 2 is a threaded head with external threads, and the second connector 3 is a female thread that can be matched with the threaded head, and the number of drill pipes is gradually increased according to the drilling depth during drilling to meet the drilling depth requirement.

[0026] In the embodiment, the end of the rod part 1 corresponding to the female thread is provided with a diameter expansion section 5, and the end of the diameter expansion section 5 towards the first connector 2 is coaxially provided with an end sealing groove 6 along the outer wall of the rod part 1, the tail end of the polyphenylene sulfide film 4 extends into the end sealing groove 6, and the end sealing groove 6 is filled with potting glue for fixing the polyphenylene sulfide film 4. The tail of the polyphenylene sulfide film 4 is sealed by the potting glue, which further avoids the problem of loosening of the polyphenylene sulfide film 4 wound on the rod part 1.

[0027] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A drill pipe wrapped with a polyphenylene sulfide film, characterized in that: The invention comprises a rod portion (1), wherein one end of the rod portion (1) is provided with a first connector (2), and the other end of the rod portion (1) is provided with a second connector (3), the first connector (2) of the rod portion (1) is used for coaxially matching and connecting with the second connector (3) of an adjacent section of drill pipe, and the second connector (3) is used for coaxially matching and connecting with the first connector (2) of an adjacent section of drill pipe; and the outer wall of the rod portion (1) is wrapped with a polyphenylene sulfide film (4).

2. The drill rod wrapped with polyphenylene sulfide film according to claim 1, characterized in that: The polyphenylene sulfide film (4) is spirally wound on the rod (1) along the length direction of the rod (1).

3. The drill rod wrapped with polyphenylene sulfide film according to claim 2, characterized in that: The polyphenylene sulfide film (4) on the rod (1) is spirally wound around the outer wall of the rod (1) starting from a position close to the first connector (2), and the winding direction is opposite to the rotation direction of the drill rod during drilling.

4. The drill rod wrapped with polyphenylene sulfide film according to claim 3, characterized in that: The overlapping length between adjacent layers of polyphenylene sulfide film (4) is 0.2 to 0.6 times the diameter of the rod (1).

5. The drill pipe wrapped with polyphenylene sulfide film according to claim 1, characterized in that: An adhesive layer is also provided between the outer wall of the rod portion (1) and the wound polyphenylene sulfide film (4).

6. The drill rod wrapped with polyphenylene sulfide film according to claim 1, characterized in that: The first connecting head (2) is a threaded head with an external thread, and the second connecting head (3) is a female thread that can cooperate with the threaded head.

7. The drill rod wrapped with polyphenylene sulfide film according to claim 6, characterized in that: An expanded diameter section (5) is provided at the end of the rod portion (1) corresponding to the female thread, and a sealing groove (6) is coaxially provided along the outer wall of the rod portion (1) at the end of the expanded diameter section (5) facing the first connector (2), and the tail end of the polyphenylene sulfide film (4) extends into the sealing groove (6), and the sealing groove (6) is filled with a potting glue for fixing the polyphenylene sulfide film (4).

8. The drill pipe wrapped with polyphenylene sulfide film according to any one of claims 1 to 7, characterized in that: The thickness of the polyphenylene sulfide is 0.05 to 0.3 times the diameter of the drill rod.

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