Bypass valve sliding sleeve, production process thereof and bypass valve

Abstract

The invention provides a bypass valve sliding sleeve, a production process thereof and a bypass valve, and relates to the field of petroleum drilling. Comprising a main body rod, a spring rod, a spring and a limiting device, the diameter of the main body rod is larger than that of the spring rod, and one end of the main body rod is detachably connected with the spring rod; a limiting groove is formed in the end, away from the body rod, of the spring rod in the axial direction, one end of the limiting device is slidably connected into the limiting groove, and the spring is arranged outside the spring rod in a sleeving mode and abuts against the position between the limiting device and the body rod. The production process comprises the steps that the main body rod is made of an erosion-resistant alloy material; the spring rod is made of a high-strength alloy steel material; according to the shape and size of a to-be-machined limiting device, a high-strength alloy steel material is adopted to prepare an initial limiting column body, and the initial limiting column body is subjected to surface treatment. The split type structure is convenient to produce, disassemble, assemble and maintain, and the production cost and the damage rejection rate can be reduced; the strength of the sliding sleeve and the limiting device can be improved, the overall strength of the bypass valve is improved, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the field of oil drilling, and in particular to a bypass valve sleeve and a production process thereof, and a bypass valve. Background Art

[0002] Multiple-opening and closing plugging and circulating tools are widely used in the oil drilling industry. When a well leakage accident occurs, they can plug leaks with high-concentration large-particle materials multiple times without drilling, as well as wash the well or clean the casing, effectively reducing the risk of on-site well control. During the application of multiple-opening and closing plugging and circulating tools, the sleeve seal and multiple openings cause the sleeve to wear easily, resulting in tool failure. Therefore, the development of an economical and durable sleeve can improve the service life of multiple-opening and closing plugging and circulating tools and underground safety.

[0003] However, the existing multiple-opening and closing leak plugging cycle tool sleeves are mostly produced in one piece, which has a high production cost and cannot be repaired after being damaged, resulting in a high scrap rate. In addition, the sleeve limit device of the existing multiple-opening and closing leak plugging cycle tool has low strength and is prone to breakage, resulting in tool failure. Summary of the invention

[0004] The object of the present invention is to provide a bypass valve sleeve and its production process and a bypass valve. The split structure is convenient for production and disassembly and maintenance, which can reduce production costs and damage and scrap rates; it can improve the strength of the sleeve and the limit device, thereby improving the overall strength of the bypass valve and extending its service life.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A bypass valve sleeve comprises a main body rod, a spring rod, a spring and a limit device, wherein the diameter of the main body rod is larger than the diameter of the spring rod, and one end of the main body rod is detachably connected to the spring rod;

[0007] One end of the spring rod away from the main rod is provided with a limiting groove along its axial direction, one end of the limiting device is slidably connected in the limiting groove, and the spring is sleeved outside the spring rod and abuts between the limiting device and the main rod.

[0008] Furthermore, in the present invention, the limiting device includes a connecting rod and a sliding rod, one end of the connecting rod is connected to one end of the sliding rod, the diameter of the connecting rod is larger than the diameter of the sliding rod, and one end of the sliding rod is slidably connected in the limiting groove, wherein the diameter of the sliding rod is 10 mm.

[0009] Furthermore, in the present invention, a sliding block is provided in the limiting groove, a groove matching the sliding rod is provided on the side of the sliding block facing the sliding rod, and one end of the sliding rod is inserted into the groove.

[0010] Furthermore, in the present invention, the limiting devices are provided in two groups, and the two groups of limiting devices are arranged opposite to the limiting grooves opened on opposite sides of the spring rod.

[0011] Furthermore, in the present invention, a first magnetic sheet is embedded in a side wall of the limiting groove corresponding to the initial insertion position of the sliding rod, and a second magnetic sheet is embedded in a side wall of the sliding block, and the first magnetic sheet and the second magnetic sheet have opposite magnetic properties.

[0012] Furthermore, in the present invention, the first magnetic sheet and the second magnetic sheet are made of weak magnetic material, and the thickness of the first magnetic sheet and the second magnetic sheet is 2mm-3mm.

[0013] Furthermore, in the present invention, the main body rod is threadedly connected to the spring rod.

[0014] Furthermore, in the present invention, one end of the spring rod connected to the main rod is provided with a threaded portion and a butt portion integrally connected thereto, the butt portion is located at the end of the spring rod, and the diameter of the threaded portion is greater than the diameter of the butt portion; and one end of the main rod connected to the spring rod is provided with a stepped groove matched with the threaded portion and the butt portion.

[0015] A production process for a bypass valve sleeve comprises the following steps:

[0016] The main rod is made of erosion-resistant alloy material, and an internal thread is processed at one end of the main rod; the spring rod is made of high-strength alloy steel material, and an external thread matching the internal thread is processed at one end of the spring rod;

[0017] According to the shape and size of the limit device to be processed, an initial limit cylinder is made of high-strength alloy steel material, and the initial limit cylinder is surface treated; wherein the specific steps of the surface treatment include:

[0018] Placing the initial limiting cylinder in a degreasing tank at a temperature of 100°C ± 5°C for degreasing;

[0019] The degreased initial limiting cylinder is placed in a nitriding furnace at a temperature of 580°C for nitriding for 2 hours;

[0020] The nitrided initial limiting cylinder is placed in an oxidation furnace at a temperature of 420°C for oxidation for 1 hour;

[0021] placing the oxidized initial limiting column in a desalting tank for desalting;

[0022] The initial limit cylinder after desalting is placed in a sandblasting machine for polishing;

[0023] A thread groove and a sealing groove are processed at corresponding positions of the polished initial limiting cylinder to obtain a limiting device.

[0024] A bypass valve comprises the sliding sleeve as described above, and also comprises a bypass short section, a ball basket short section and a ball basket, wherein the bypass short section is sleeved on the outside of the sliding sleeve, one end of the bypass short section is threadedly connected to one end of the ball basket short section, and the ball basket is penetrated into the interior of the ball basket short section.

[0025] The present invention has at least the following advantages or beneficial effects:

[0026] The present invention sets the sliding sleeve as a split combined structure, and the main rod and the spring rod are detachably connected, which is convenient for independent batch processing. Using different materials to process different structures can save 60% of materials, and it is convenient to independently repair damage to each structure and judge it separately, which greatly reduces production costs and damage and scrap rates; by setting the diameter of the sliding rod of the limit device to 10mm, and by setting a slider in the limit groove to match the sliding rod, the strength of the limit device is greatly enhanced and the risk of fracture is reduced; at the same time, the surface of the limit device is subjected to salt bath nitriding composite treatment, which can improve its surface hardness, wear resistance and other properties, thereby improving the strength of the limit device. The split structure of the present application is convenient for production and disassembly and maintenance, which can reduce production costs and damage and scrap rates; it can improve the strength of the sliding sleeve and the limit device, thereby improving the overall strength of the bypass valve and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the structure explosion of the bypass valve provided in an embodiment of the present application;

[0029] Figure 2 A cross-sectional view of a bypass valve provided in an embodiment of the present application;

[0030] Figure 3 A structural cross-sectional view of a sliding sleeve provided in an embodiment of the present application.

[0031] Icons: 1-sleeve, 11-main rod, 12-spring rod, 13-spring, 14-limiting device, 121-limiting groove, 141-sliding rod, 142-connecting rod, 15-sliding block, 122-threaded portion, 123-abutting portion, 2-bypass short section, 3-basket short section, 31-basket. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example

[0035] Please refer to Figure 3 , which is a schematic diagram of the structure of the bypass valve sleeve in an embodiment of the present invention;

[0036] This embodiment provides a bypass valve sleeve 1, a main rod 11, a spring rod 12, a spring 13 and a limit device 14, the diameter of the main rod 11 is larger than the diameter of the spring rod 12, and one end of the main rod 11 is detachably connected to the spring rod 12;

[0037] One end of the spring rod 12 away from the main rod 11 is provided with a limiting groove 121 along its axial direction, one end of the limiting device 14 is slidably connected in the limiting groove 121, and the spring 13 is sleeved on the outside of the spring rod 12 and abuts between the limiting device 14 and the main rod 11.

[0038] Next, a bypass valve sleeve according to this exemplary embodiment will be further described.

[0039] In some embodiments of the present application, the diameter of the main rod 11 is larger than the diameter of the spring rod 12, and one end of the main rod 11 is detachably connected to the spring rod 12; the end of the spring rod 12 away from the main rod 11 is provided with a limiting groove 121 along its axial direction, one end of the limiting device 14 is slidably connected in the limiting groove 121, and the spring 13 is sleeved on the outside of the spring rod 12 and abuts between the limiting device 14 and the main rod 11. Specifically, a threaded connection can be used for connection, which is convenient for disassembly and assembly and processing. The sliding sleeve 1 is set in a way that the main rod 11 and the spring rod 12 are connected separately. According to the different use functions of different structures, different materials can be used for processing respectively, so that the processing of the sliding sleeve 1 can save 60% of the materials. After use, if the sliding sleeve 1 is damaged, it can be divided into two parts and judged separately for scrapping, changing the original integral overall scrapping situation, thereby reducing the use cost.

[0040] As a preferred embodiment, the end of the spring rod 12 connected to the main rod 11 is provided with an integrally connected threaded portion 122 and abutment portion 123, the abutment portion 123 is located at the end of the spring rod 12, and the diameter of the threaded portion 122 is larger than the diameter of the abutment portion 123; the end of the main rod 11 connected to the spring rod 12 is provided with a stepped groove adapted to the threaded portion 122 and the abutment portion 123. By setting the connection portion between the spring rod 12 and the main rod 11 as a stepped threaded connection, the end diameter is reduced, which is convenient for connection, and the stability of the threaded connection portion is increased, and the thickness of the limiting groove 121 at the spring rod 12 can be increased, thereby increasing the strength.

[0041] As a preferred embodiment, the above-mentioned limit device 14 includes a connecting rod 142 and a sliding rod 141, one end of the connecting rod 142 is connected to one end of the sliding rod 141, the diameter of the connecting rod 142 is larger than the diameter of the sliding rod 141, the connecting rod 142 is used to connect and fix with the bypass short section 2, and one end of the sliding rod 141 is slidably connected in the limit groove 121, wherein the diameter of the sliding rod 141 is 10 mm. Increasing the diameter of the sliding rod 141 of the limit device 14 from the original 6.35 mm to 10 mm can greatly enhance the strength of the limit device 14 and reduce the risk of breakage.

[0042] As a preferred embodiment, a slider 15 is provided in the above-mentioned limit groove 121, and a groove matching the sliding rod 141 is provided on the side of the slider 15 facing the sliding rod 141, and one end of the above-mentioned sliding rod 141 is inserted into the groove. By adding the slider 15 in the limit groove 121 and inserting the sliding rod 141 into the groove of the slider 15, the slider 15 and the sliding rod 141 form an integrated sliding structure, so as to further increase the strength of the sliding rod 141 during the movement of the sliding sleeve 1.

[0043] As a preferred embodiment, a first magnetic sheet is embedded in a side wall of the above-mentioned limit groove 121 corresponding to the initial insertion position of the sliding rod 141, and a second magnetic sheet is embedded in a side wall of the slider 15, and the magnetic properties of the first magnetic sheet and the second magnetic sheet are opposite. By setting the first magnetic sheet in the limit groove 121 and setting the slider 15 with the second magnetic sheet attracted thereto, during assembly, the slider 15 can be fixed in the initial position through the mutual magnetic attraction of the first magnetic sheet and the second magnetic sheet, so as to facilitate the accurate insertion of the sliding rod 141 from the bypass short section 2, thereby improving the installation accuracy and assembly efficiency.

[0044] Furthermore, the first magnetic sheet and the second magnetic sheet are made of weak magnetic material, and the thickness of the first magnetic sheet and the second magnetic sheet is 2mm-3mm. The two magnetic sheets are set to be thinner weak magnetic sheets, so that the magnetic attraction between the slider 15 and the limit groove 121 is small, and the slider 15 and the limit groove 121 can slide relative to each other under the driving force, which will not affect the movement of the sleeve 1.

[0045] As a preferred embodiment, the above-mentioned limiting device 14 is provided with two groups, and the two groups of limiting devices 14 are relatively arranged at the limiting grooves 121 opened on the opposite sides of the spring rod 12. By providing two groups of relatively opposite limiting devices 14, the stability of the sliding sleeve 1 during operation can be increased and the strength of the limiting devices 14 can be enhanced.

[0046] The embodiment of the present application also provides a production process of a bypass valve sleeve 1, comprising the following steps:

[0047] The main rod 11 is made of erosion-resistant alloy material, and an internal thread is processed at one end of the main rod 11; the spring rod 12 is made of high-strength alloy steel material, and an external thread matching the internal thread is processed at one end of the spring rod 12; by using different materials to produce the main rod 11 and the spring rod 12, processing materials can be saved and production costs can be reduced. The main rod 11 has a large diameter and is mainly subjected to liquid erosion from the front. Therefore, the main rod 11 is made of erosion-resistant alloy material. The spring rod 12 cooperates with the spring 13 and the limit device 14. After being impacted by the liquid, it moves and needs to have high strength and hardness to make it not easy to break. Therefore, it is made of high-strength alloy steel material. Finally, matching internal and external threads are processed to facilitate disassembly and assembly, facilitate the judgment of separate damage, and reduce production costs and damage scrap rate.

[0048] According to the shape and size of the limit device 14 to be processed, an initial limit cylinder is made of high-strength alloy steel material, and the initial limit cylinder is surface treated; wherein the specific steps of the surface treatment include:

[0049] Place the initial limit cylinder in a degreasing tank at a temperature of 100℃±5℃ for degreasing;

[0050] The degreased initial limiting cylinder is placed in a nitriding furnace at a temperature of 580°C for nitriding for 2 hours;

[0051] The nitrided initial limiting cylinder is placed in an oxidation furnace at a temperature of 420°C for oxidation for 1 hour;

[0052] placing the oxidized initial limiting column in a desalting tank for desalting;

[0053] The initial limit cylinder after desalting is placed in a sandblasting machine for polishing;

[0054] The thread groove and the sealing groove are processed at the corresponding position of the initial limiting cylinder after polishing to obtain the limiting device 14.

[0055] The limit device 14 is made of high-strength alloy steel material to have high strength and hardness, and is then surface treated through a salt bath nitriding composite treatment process to improve its surface hardness and wear resistance, thereby increasing the strength of the limit device 14 and reducing the risk of breakage.

[0056] The present application also provides a bypass valve, referring to Figure 1-Figure 2 , including the above-mentioned sliding sleeve 1, and also including a bypass short section 2, a ball basket short section 3 and a ball basket 31. The bypass short section 2 is sleeved on the outside of the sliding sleeve 1, one end of the bypass short section 2 is threadedly connected to one end of the ball basket short section 3, and the ball basket 31 is penetrated into the inside of the ball basket short section 3.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bypass valve sleeve, characterized in that: It comprises a main body rod, a spring rod, a spring and a limiting device, wherein the diameter of the main body rod is larger than the diameter of the spring rod, and one end of the main body rod is detachably connected to the spring rod; One end of the spring rod away from the main rod is provided with a limiting groove along its axial direction, one end of the limiting device is slidably connected in the limiting groove, and the spring is sleeved outside the spring rod and abuts between the limiting device and the main rod.

2. The bypass valve sleeve according to claim 1, characterized in that: The limiting device includes a connecting rod and a sliding rod, one end of the connecting rod is connected to one end of the sliding rod, the diameter of the connecting rod is larger than the diameter of the sliding rod, and one end of the sliding rod is slidably connected in the limiting groove, wherein the diameter of the sliding rod is 10 mm.

3. The bypass valve sleeve according to claim 2, characterized in that: A sliding block is arranged in the limiting groove, a groove matching with the sliding rod is arranged on a side of the sliding block facing the sliding rod, and one end of the sliding rod is inserted in the groove.

4. The bypass valve sleeve according to claim 1 or 3, characterized in that: The limiting devices are provided with two groups, and the two groups of limiting devices are arranged opposite to the limiting grooves opened on the opposite sides of the spring rod.

5. The bypass valve sleeve according to claim 3, characterized in that: A first magnetic sheet is embedded in a side wall of the limiting groove corresponding to the initial insertion position of the sliding rod, and a second magnetic sheet is embedded in a side wall of the sliding block. The first magnetic sheet and the second magnetic sheet have opposite magnetic properties.

6. The bypass valve sleeve according to claim 5, characterized in that: The first magnetic sheet and the second magnetic sheet are made of weak magnetic material, and the thickness of the first magnetic sheet and the second magnetic sheet is 2mm-3mm.

7. The bypass valve sleeve according to claim 1, characterized in that: The main body rod is threadedly connected to the spring rod.

8. The bypass valve sleeve according to claim 7, characterized in that: The end of the spring rod connected to the main rod is provided with a threaded portion and an abutment portion that are integrally connected, the abutment portion is located at the end of the spring rod, and the diameter of the threaded portion is greater than the diameter of the abutment portion; the end of the main rod connected to the spring rod is provided with a stepped groove that is compatible with the threaded portion and the abutment portion.

9. A production process for a bypass valve sleeve, characterized in that: The steps include: The main rod is made of erosion-resistant alloy material, and an internal thread is processed at one end of the main rod; the spring rod is made of high-strength alloy steel material, and an external thread matching the internal thread is processed at one end of the spring rod; According to the shape and size of the limit device to be processed, an initial limit cylinder is made of high-strength alloy steel material, and the initial limit cylinder is surface treated; wherein the specific steps of the surface treatment include: Placing the initial limiting cylinder in a degreasing tank at a temperature of 100°C ± 5°C for degreasing; The degreased initial limiting cylinder is placed in a nitriding furnace at a temperature of 580°C for nitriding for 2 hours; The nitrided initial limiting cylinder is placed in an oxidation furnace at a temperature of 420°C for oxidation for 1 hour; placing the oxidized initial limiting column in a desalting tank for desalting; The initial limit cylinder after desalting is placed in a sandblasting machine for polishing; A thread groove and a sealing groove are processed at corresponding positions of the polished initial limiting cylinder to obtain a limiting device.

10. A bypass valve, characterized in that: It includes the sliding sleeve as described in any one of claims 1-8, and also includes a bypass short section, a ball basket short section and a ball basket, the bypass short section is sleeved on the outside of the sliding sleeve, one end of the bypass short section is threadedly connected to one end of the ball basket short section, and the ball basket is inserted into the interior of the ball basket short section.

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