Rust-proof clamp spring for bypass valve and production process of rust-proof clamp spring

Abstract

The invention provides a rust-proof clamp spring for a bypass valve and a production process of the rust-proof clamp spring, and relates to the field of petroleum drilling. A protective flow guide ring is arranged at the end, away from the ball seat, of the clamp spring body and comprises a first ring part and a second ring part which are integrally formed, the first ring part is tightly attached to one end face of the clamp spring body, and the second ring part is adjacent to the inner wall of the clamp spring body. The clamp spring body is subjected to heat treatment under a first preset condition, and the clamp spring subjected to heat treatment is subjected to first anti-rust treatment; and the protective flow guide ring is subjected to surface treatment under a second preset condition, the protective flow guide ring subjected to surface treatment is subjected to second rust-proof treatment, and the protective flow guide ring subjected to rust-proof treatment is subjected to heat treatment under a third preset condition. By optimizing the structure and the production process of the snap spring, direct erosion of drilling fluid to the snap spring can be reduced, the anti-rust and anti-corrosion performance of the snap spring is improved, and the service life of the snap spring is prolonged.

Description

Technical Field

[0001] The invention relates to the field of oil drilling, in particular to a rust-proof clip spring for a bypass valve and a production process thereof. Background Art

[0002] Multiple-open / close plugging cycle 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 starting drilling, as well as wash the well or clean the casing, effectively reducing on-site well control risks.

[0003] The multiple switch plugging cycle tool has a retaining spring for fixing the ball seat. However, ordinary retaining springs are easily corroded and damaged due to the continuous impact of drilling fluid under oil drilling conditions. They have a very short service life and cannot meet the requirements for on-site use of the tool. Summary of the invention

[0004] The purpose of the present invention is to provide a rust-proof retaining spring for a bypass valve and a production process thereof. By optimizing the structure and production process of the retaining spring, the direct erosion of the retaining spring by drilling fluid can be reduced, the rust-proof and corrosion-resistant performance of the retaining spring can be improved, and its service life can be extended.

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

[0006] A rust-proof retaining ring for a bypass valve comprises a retaining ring body. An end of the retaining ring body away from a ball seat is provided with a protective guide ring. The protective guide ring comprises an integrally formed first ring portion and a second ring portion. The first ring portion is tightly attached to an end face of the retaining ring body, and the second ring portion is adjacent to an inner wall of the retaining ring body.

[0007] Furthermore, in the present invention, a first sealing groove is provided on the outer ring wall of the first ring portion, and the first sealing groove is used to install a first sealing ring, and the first sealing ring is used to abut against the inner wall of the sliding sleeve in the bypass valve; a second sealing groove is provided on the inner ring wall of the retaining ring body, and the first sealing groove is used to install a second sealing ring, and the second sealing ring is used to abut against the second ring portion.

[0008] Furthermore, in the present invention, the inner ring wall of the first ring portion and the inner ring wall of the second ring portion are in the same plane and are an inclined surface with a diameter gradually decreasing from the first ring portion to the second ring portion.

[0009] Furthermore, in the present invention, the retaining spring body is made of nickel alloy material.

[0010] A production process for a rust-proof retaining ring for a bypass valve comprises the following steps:

[0011] The clamp body is subjected to a heat treatment under a first preset condition, and the heat-treated clamp is subjected to a first rust-proof treatment;

[0012] The protective guide ring is subjected to surface treatment under a second preset condition, the surface treated protective guide ring is subjected to a second anti-rust treatment, and the anti-rust treated protective guide ring is subjected to heat treatment under a third preset condition.

[0013] Further, in the present invention, the step of heat treating the clamp body under the first preset condition includes:

[0014] Put the clip into a vacuum quenching furnace for quenching at a temperature of 1200°C-1300°C. After quenching and cooling to 320°C-330°C, take it out and cool it to room temperature.

[0015] Put the quenched snap ring into a heating furnace for heating at a temperature of 1000°C-1100°C. After heating for 8-10 minutes, take it out and cool it in water.

[0016] The water-cooled retaining spring is placed in a vacuum tempering furnace for tempering at a temperature of 570°C-600°C for 20min-25min, and then air-cooled to room temperature.

[0017] Furthermore, in the present invention, the first anti-rust treatment step includes: plating or coating an anti-rust layer on the surface of the retaining spring.

[0018] Furthermore, in the present invention, the step of surface treating the protective guide ring under the second preset conditions includes: pickling the protective guide ring, using 15%-20% hydrochloric acid + 1%-2% nitric acid + 20g / L-30g / L aminoacetic acid + ferrous content of 200 grams / liter + water for surface treatment, the treatment time is 20min-60min, and the temperature is room temperature.

[0019] Furthermore, in the present invention, the step of subjecting the surface-treated protective guide ring to a second anti-rust treatment comprises: oiling, soaking the protective guide plate with 100°C steam and clean water, quickly evaporating after removing the cylinder, preparing a neutralizing solution with 5%-10% sodium carbonate, and the neutralization time is 3min-6min.

[0020] Furthermore, in the present invention, the step of heat treating the protective guide ring after rust prevention treatment under the third preset conditions includes: normalizing at a heating temperature of 940°C-955°C, holding time of 306 minutes, air cooling, tempering temperature of 680°C-710°C, holding time of 906 minutes, and air cooling.

[0021] The present invention has at least the following advantages or beneficial effects:

[0022] The present invention optimizes the structure of the retaining spring, arranges a protective guide ring at one end of the retaining spring away from the ball seat, guides the drilling fluid to flow around the retaining spring through the protective guide ring, and reduces direct scouring and corrosion of the retaining spring by the drilling fluid.

[0023] The present application performs performance treatment on the retaining ring body and the protective guide ring respectively, first heat-treating the retaining ring body and then performing anti-rust treatment on its surface, which can improve the strength and hardness of the retaining ring and improve the anti-rust and anti-corrosion performance of the retaining ring body surface; by pickling the protective guide ring to remove the surface oxide, then performing anti-rust treatment on it, improving its anti-rust and corrosion resistance, and finally performing heat treatment on it, so that it has higher strength and excellent corrosion resistance. By multi-process treatment of the protective guide ring to improve its performance, it can resist the frontal impact of the drilling fluid, effectively protect the retaining ring body, and extend the service life of the retaining ring body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 A schematic diagram of the structure of the retaining spring provided in an embodiment of the present application;

[0026] Figure 2 A flow chart of the steps of the production process of the retaining ring provided in an embodiment of the present application.

[0027] Icon: 1- retaining ring body, 11- second sealing groove, 2- protective guide ring, 21- first ring part, 22- second ring part, 23- first sealing groove. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] Example

[0031] Please refer to Figure 1 , which is a schematic structural diagram of a rust-proof retaining spring for a bypass valve in an embodiment of the present invention;

[0032] The present embodiment provides a rust-proof retaining ring for a bypass valve, including a retaining ring body 1. A protective guide ring 2 is provided at the end of the retaining ring body 1 away from the ball seat. The protective guide ring 2 includes an integrally formed first ring portion 21 and a second ring portion 22. The first ring portion 21 is tightly attached to one end surface of the retaining ring body 1, and the second ring portion 22 is adjacent to the inner wall of the retaining ring body 1.

[0033] Next, a rust-proof retaining spring for a bypass valve according to this exemplary embodiment will be further described.

[0034] In some embodiments of the present application, the protective guide ring 2 is arranged at one end of the retaining ring body 1 away from the ball seat, so as to guide the drilling fluid, guide the drilling fluid to flow around the retaining ring, and reduce the direct erosion and corrosion of the retaining ring body 1 by the drilling fluid. Specifically, it includes an integrally formed first ring portion 21 and a second ring portion 22, the first ring portion 21 is close to one end face of the retaining ring body 1, and the second ring portion 22 is adjacent to the inner wall of the retaining ring body 1. The first ring portion 21 and the retaining ring body 1 are both embedded in the annular groove of the inner wall of the inner sleeve of the bypass valve for position fixing, and the second ring portion 22 is arranged on the inner ring of the retaining ring body 1. In the natural state of the retaining ring, there is a certain gap between the second ring portion 22 and the inner ring wall of the retaining ring body 1. When the retaining ring body 1 and the protective guide ring 2 are installed on the inner sleeve of the bypass valve, the second ring portion 22 is close to the inner ring wall of the retaining ring body 1, and a seal is achieved between the two. The first ring portion 21 and the second ring portion 22 can protect the side of the retaining ring body 1 facing the flow direction of the drilling fluid and the flow surface, thereby reducing the direct contact and erosion between the retaining ring body 1 and the drilling fluid, thereby increasing its service life and enabling it to limit the ball seat for a long time.

[0035] As a preferred embodiment, the outer ring wall of the first ring portion 21 is provided with a first sealing groove 23, the first sealing groove 23 is used to install the first sealing ring, and the first sealing ring is used to abut against the inner wall of the sliding sleeve in the bypass valve; the inner ring wall of the retaining ring body 1 is provided with a second sealing groove 11, the first sealing groove 23 is used to install the second sealing ring, and the second sealing ring is used to abut against the second ring portion 22. By providing the first sealing groove 23 on the outer ring wall of the first ring portion 21 to accommodate the first sealing ring, the sealing effect between the first ring portion 21 and the sliding sleeve in the bypass valve is improved, and the drilling fluid is prevented from penetrating into the retaining ring body 1 from the outer ring wall. By providing the second sealing groove 11 on the inner ring wall of the retaining ring body 1 to accommodate the second sealing ring, the sealing effect between the second ring portion 22 and the retaining ring body 1 is improved, and the drilling fluid is prevented from reflux and corroding the retaining ring body 1. The above structural design can further improve the protective effect of the protective guide ring 2.

[0036] As a preferred embodiment, the inner ring wall of the first ring portion 21 and the inner ring wall of the second ring portion 22 are in the same plane and are an inclined surface with a gradually decreasing diameter from the first ring portion 21 to the second ring portion 22. The inclined surface is preferably an arc surface to better adapt to the fluid dynamics characteristics, form a smooth flow channel between the protective guide ring 2, ensure that the drilling fluid can smoothly bypass the retaining spring body 1 and continue to flow, and avoid adverse factors such as eddy currents or turbulence.

[0037] As a preferred implementation, the retaining spring body 1 is made of nickel alloy material, which has better corrosion resistance.

[0038] Reference Figure 2 The present application also provides a production process for a rust-proof retaining spring for a bypass valve, comprising the following steps:

[0039] S110, subjecting the clamp body 1 to a heat treatment under a first preset condition, and subjecting the heat-treated clamp to a first rust-proof treatment;

[0040] S120, performing surface treatment on the protective guide ring 2 under a second preset condition, performing a second anti-rust treatment on the surface treated protective guide ring 2, and performing a heat treatment on the anti-rust treated protective guide ring 2 under a third preset condition.

[0041] Example 1

[0042] The specific steps of heat-treating the clamp body 1 under the first preset condition and performing the first rust-proof treatment on the heat-treated clamp include:

[0043] Put the retaining spring into a vacuum quenching furnace for quenching at a temperature of 1200°C. After quenching and cooling to 320°C, take it out and cool it to room temperature. Put the quenched retaining spring into a heating furnace for heating at a temperature of 1000°C. After heating for 8 minutes, take it out and water-cool it. Put the water-cooled retaining spring into a vacuum tempering furnace for tempering at a tempering temperature of 570°C for 20 minutes, and then air-cool it to room temperature. Plate or apply an anti-rust layer on the surface of the retaining spring.

[0044] The specific steps of performing surface treatment on the protective guide ring 2 under the second preset condition, performing second anti-rust treatment on the surface treated protective guide ring 2, and performing heat treatment on the anti-rust treated protective guide ring 2 under the third preset condition include:

[0045] The protective guide ring 2 is pickled with 15% hydrochloric acid + 1% nitric acid + 20g / L aminoacetic acid + ferrous content 200g / L + water for surface treatment, the treatment time is 20min, and the temperature is room temperature. The surface treated protective guide ring 2 is oiled, and the protective guide plate is soaked in 100℃ steam and clean water. After the cylinder is removed, it is quickly evaporated to dryness, and a neutralizing solution is prepared with a concentration of 5% sodium carbonate for a neutralization time of 3min. The protective guide ring 2 after rust prevention treatment is heated, the heating temperature is 940℃ for normalizing, the insulation time is 306min, and air cooling is performed. The tempering temperature is 680℃, the insulation time is 906min, and air cooling is performed.

[0046] Example 2

[0047] The specific steps of heat-treating the clamp body 1 under the first preset condition and performing the first rust-proof treatment on the heat-treated clamp include:

[0048] The retaining spring is placed in a vacuum quenching furnace for quenching at a temperature of 1250°C. After quenching and cooling to 325°C, it is taken out and cooled to room temperature. The quenched retaining spring is placed in a heating furnace for heating at a temperature of 1050°C. After heating for 9 minutes, it is taken out and water-cooled. The water-cooled retaining spring is placed in a vacuum tempering furnace for tempering at a temperature of 585°C for 23 minutes, and then air-cooled to room temperature. An anti-rust layer is plated or coated on the surface of the retaining spring.

[0049] The specific steps of performing surface treatment on the protective guide ring 2 under the second preset condition, performing second anti-rust treatment on the surface treated protective guide ring 2, and performing heat treatment on the anti-rust treated protective guide ring 2 under the third preset condition include:

[0050] The protective guide ring 2 is pickled with 17% hydrochloric acid + 1.5% nitric acid + 25g / L aminoacetic acid + ferrous content 200g / L + water for surface treatment, the treatment time is 40min, and the temperature is room temperature. The surface treated protective guide ring 2 is oiled, and the protective guide plate is soaked in 100℃ steam and clean water. After the cylinder is removed, it is quickly evaporated to dryness, and a neutralizing solution is prepared with 5% sodium carbonate for a neutralization time of 5.5min. The protective guide ring 2 after rust prevention treatment is heated, the heating temperature is 948℃ for normalizing, the insulation time is 306min, and air cooling is performed. The tempering temperature is 695℃, the insulation time is 906min, and air cooling is performed.

[0051] Example 3

[0052] The specific steps of heat-treating the clamp body 1 under the first preset condition and performing the first rust-proof treatment on the heat-treated clamp include:

[0053] The retaining spring is placed in a vacuum quenching furnace for quenching at a temperature of 1300°C. After quenching and cooling to 330°C, it is taken out for cooling for 10 minutes and then taken out for water cooling. The water-cooled retaining spring is placed in a vacuum tempering furnace for tempering at a temperature of 600°C for 25 minutes, and then air-cooled to room temperature. An anti-rust layer is plated or coated on the surface of the retaining spring.

[0054] The specific steps of performing surface treatment on the protective guide ring 2 under the second preset condition, performing second anti-rust treatment on the surface treated protective guide ring 2, and performing heat treatment on the anti-rust treated protective guide ring 2 under the third preset condition include:

[0055] The protective guide ring 2 is pickled with 20% hydrochloric acid + 2% nitric acid + 30g / L aminoacetic acid + ferrous content 200g / L + water for surface treatment, the treatment time is 60min, and the temperature is room temperature. The surface treated protective guide ring 2 is oiled, and the protective guide plate is soaked in 100℃ steam and clean water. After the cylinder is removed, it is quickly evaporated to dryness, and a neutralizing solution is prepared with a concentration of 5% sodium carbonate, and the neutralization time is 6min. The protective guide ring 2 after rust prevention treatment is heated, the heating temperature is 955℃ for normalizing, the insulation time is 306min, and air cooling is performed. The tempering temperature is 710℃, the insulation time is 906min, and air cooling is performed.

[0056] The ball basket of the multiple-open-close plugging cycle tool works for a long time underground, and the liquid corrodes the retaining spring for a long time. Therefore, the corrosion resistance of the retaining spring can be improved by optimizing the material, surface treatment and structural design of the retaining spring, thereby increasing its service life.

[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 rust-proof retaining spring for a bypass valve, characterized in that: It includes a retaining spring body, and a protective guide ring is provided at one end of the retaining spring body away from the ball seat. The protective guide ring includes a first ring portion and a second ring portion that are integrally formed. The first ring portion is tightly attached to one end face of the retaining spring body, and the second ring portion is adjacent to the inner wall of the retaining spring body.

2. The rust-proof retaining spring for a bypass valve according to claim 1, characterized in that: A first sealing groove is formed on the outer ring wall of the first ring portion, and the first sealing groove is used to install a first sealing ring, and the first sealing ring is used to abut against the inner wall of the sliding sleeve in the bypass valve; a second sealing groove is formed on the inner ring wall of the retaining ring body, and the first sealing groove is used to install a second sealing ring, and the second sealing ring is used to abut against the second ring portion.

3. The rust-proof retaining spring for a bypass valve according to claim 1 or 2, characterized in that: The inner ring wall of the first ring portion and the inner ring wall of the second ring portion are in the same plane and are an inclined surface with a diameter gradually decreasing from the first ring portion to the second ring portion.

4. The rust-proof retaining spring for a bypass valve according to claim 1, characterized in that: The clamping spring body is made of nickel alloy material.

5. A production process for a rust-proof retaining spring for a bypass valve, characterized in that: The steps include: The clamp body is subjected to a heat treatment under a first preset condition, and the heat-treated clamp is subjected to a first rust-proof treatment; The protective guide ring is subjected to surface treatment under a second preset condition, the surface treated protective guide ring is subjected to a second anti-rust treatment, and the anti-rust treated protective guide ring is subjected to heat treatment under a third preset condition.

6. The production process according to claim 5, characterized in that: The step of heat treating the clamp body under the first preset condition comprises: Put the clip into a vacuum quenching furnace for quenching at a temperature of 1200°C-1300°C. After quenching and cooling to 320°C-330°C, take it out and cool it to room temperature. Put the quenched snap ring into a heating furnace for heating at a temperature of 1000°C-1100°C. After heating for 8-10 minutes, take it out and cool it in water. The water-cooled retaining spring is placed in a vacuum tempering furnace for tempering at a temperature of 570°C-600°C for 20min-25min, and then air-cooled to room temperature.

7. The production process according to claim 5, characterized in that: The first anti-rust treatment step includes: plating or coating an anti-rust layer on the surface of the retaining spring.

8. The production process according to claim 5, characterized in that: The step of surface treating the protective guide ring under the second preset condition includes: pickling the protective guide ring, using 15%-20% hydrochloric acid + 1%-2% nitric acid + 20g / L-30g / L aminoacetic acid + ferrous content 200g / L + water for surface treatment, the treatment time is 20min-60min, and the temperature is room temperature.

9. The production process according to claim 5, characterized in that: The step of performing a second anti-rust treatment on the surface treated protective guide ring includes: oiling, soaking the protective guide plate with 100°C steam and clean water, quickly evaporating after the cylinder is taken out, preparing a neutralizing solution with 5%-10% sodium carbonate, and the neutralization time is 3min-6min.

10. The production process according to claim 5, characterized in that: The step of heat treating the anti-rust treated protective guide ring under the third preset condition includes: normalizing at a heating temperature of 940°C-955°C, holding time of 306 minutes, air cooling, tempering at a temperature of 680°C-710°C, holding time of 906 minutes, and air cooling.

Images