Valve plate of ultrahigh-pressure wellhead flat valve and preparation method of valve plate

Abstract

The invention discloses a valve plate of an ultrahigh-pressure wellhead flat valve and a preparation method of the valve plate, and belongs to the technical field of valves for oil exploitation. The number of the T-shaped connecting groove plates is two, and the two T-shaped connecting groove plates are fixedly connected to the two ends of the valve plate body correspondingly. And the runner via hole is formed in the position, close to the edge, of one side of the outer surface of the valve plate body. According to the ultrahigh-pressure wellhead flat valve plate and the preparation method thereof, the flat valve plate is simple in overall structure, easy and convenient to use, high in structural strength and high in corrosion resistance, through smelting treatment, a metal composite powder material is molten and combined to cover a valve plate base material according to a metal microdroplet jetting additive manufacturing printing mode, and the valve plate base material is formed; the compact wear-resistant and corrosion-resistant metal composite layer tightly combined with the valve plate base material is formed, the valve plate base material is an alloy forge piece, the powder material impacts and permeates into the base material through high temperature, the compactness of the whole material is higher, and the stability in the using process is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of valves used in petroleum exploitation, and in particular relates to a valve plate of an ultra-high pressure wellhead flat valve and a preparation method thereof. Background Art

[0002] In recent years, my country's deep and ultra-deep oil and gas resources have accounted for more than 34% of the country's total oil and gas resources. Deep and ultra-deep layers have become the main battlefield for major oil and gas discoveries in my country. With the deepening of ultra-deep drilling depth, China's complex continental geological conditions and large-scale volume fracturing of unconventional oil and gas require the development of ultra-high pressure major key wellhead equipment.

[0003] The technical indicators of flat gate valves are mainly measured from the aspects of pressure bearing performance, sealing performance, operating performance, and service life. At present, domestic tungsten carbide and other flat valves have serious wear and tear, short life, cracking and falling off during use, which seriously affects the efficiency and safety of oil and gas production. Therefore, it has become an important research topic to carry out technical innovation on the wear-resistant materials of ultra-high pressure wellhead flat valves and improve their wear resistance and service life.

[0004] At present, domestic tungsten carbide and other flat valves have serious wear and tear, short life, cracking and falling off during use, which seriously affects the efficiency and safety of oil and gas extraction. Therefore, it has become an important research topic to carry out technical innovation on the wear-resistant materials of ultra-high pressure wellhead flat valves and improve their wear resistance and service life. Ultra-high pressure wellhead flat valve is an important wellhead equipment, and its components include valve body, valve seat and valve plate, among which the valve plate is the core component. The frequent opening and closing of the wellhead requires it to have impact resistance, wear resistance and corrosion resistance. Summary of the invention

[0005] The purpose of the present invention is to: the overall structure of the flat valve plate is relatively simple, easy to use, has high structural strength and high corrosion resistance. Through the use of smelting treatment, the metal composite powder material is melted and combined to cover the valve plate substrate according to the metal droplet jet additive manufacturing printing method to form a dense, wear-resistant and corrosion-resistant metal composite layer tightly combined with the valve plate substrate. In addition, the valve plate substrate is an alloy forging. The high temperature causes the powder material to impact and penetrate into the substrate, and the density of the entire material is higher, ensuring stability during use. The invention is the first to create a hypersonic and ultra-low temperature annular hole gas jet cooling technology. The metal powder has controllable particle size, high direct powder recovery rate, high sphericity rate and is green and environmentally friendly, with no wastewater discharge, secondary energy utilization and low energy consumption. It adopts droplet jet metallurgy combined with additive manufacturing technology to make the product have high density, no thermal deformation and mirror-like surface forming effect. It can be widely used in the fields of oil extraction, aerospace, shipbuilding, intelligent machinery, energy and chemical industry, wind, solar, thermal and hydropower generation due to its wear resistance, corrosion resistance and impact resistance, driving the rapid development of metal powder raw material production and additive manufacturing technology, with significant economic benefits and good social benefits.

[0006] The technical solution adopted by the present invention is as follows: a valve plate of an ultra-high pressure wellhead flat valve, comprising:

[0007] Valve plate body;

[0008] Two T-shaped connecting groove plates are provided, and the two T-shaped connecting groove plates are respectively fixedly connected to the two ends of the valve plate body; and

[0009] The flow channel through hole is opened on one side of the outer surface of the valve plate body near the edge.

[0010] A method for preparing a valve plate of an ultra-high pressure wellhead flat valve comprises the following steps:

[0011] Step 1: Appearance design and material preparation: Design the basic data of the valve plate according to the use requirements and working environment, and select the appropriate valve plate substrate and metal composite powder material according to the basic data of the valve plate.

[0012] Step 2: Mechanical rough machining: performing rough cutting on the valve plate substrate according to the basic data of the valve plate to obtain a preliminary valve plate.

[0013] Step 3: Heat treatment: heat-treating the initial valve plate to modify it and obtain a modified valve plate.

[0014] Step 4: Smelting treatment: The metal composite powder material is clad on the surface of the modified valve plate through a metal droplet jet additive manufacturing printing process to obtain a metallurgical symbiotic valve plate.

[0015] Step 5: Surface treatment: Surface treatment is performed on the metallurgical symbiotic body valve plate to obtain a finished valve plate.

[0016] Step 6: Quality inspection: Perform ultrasonic flaw detection on the finished valve plate to ensure that the quality meets the requirements.

[0017] Furthermore, in step one, the valve plate basic data includes structure, material and size, the valve plate substrate is a 718 material alloy forging, and the 718 material alloy forging mainly comprises 55% nickel, 17-21% chromium, 2.8-3.3% molybdenum, 0.8-1.5% titanium and trace metal elements, and the trace metal elements include 0-0.35% manganese, 4.87-5.2% niobium, 0-0.045% carbon, 0.4-0.6% aluminum, 0-1% cobalt, 0-0.35% silicon, 0-0.01% phosphorus, 0-0.01% sulfur, 0-0.006% boron, 0-0.23% copper, 0-0.001% lead, 0-0.0005% selenium, 0-0.00005% bismuth, 0-0.003% calcium and 0-0.006% magnesium.

[0018] Furthermore, in step one, the main components of the metal composite powder material include 40% nickel, 1.8% molybdenum, 22% chromium, 0.2% carbon, 24.37% tungsten, 0.6% aluminum, 6% silicon and 0.03% cobalt.

[0019] Furthermore, in step 2, the rough cutting processing device includes a lathe and a milling machine, and the rough cutting processing includes milling, turning and drilling.

[0020] Furthermore, in step three, the heat treatment includes annealing, normalizing, quenching, tempering and bulk heating to improve the performance of the material.

[0021] Furthermore, in the step 4, the metal droplet jetting additive manufacturing printing process comprises the following steps:

[0022] S201, printing metal droplets of lower temperature at a larger interval so that the printing track consists of a discrete convex point sequence;

[0023] S202. According to the shape requirements of the printed part, high-temperature droplets are selectively deposited between discrete bumps, and the surface tension capillary expansion mechanism of the high-temperature droplets between the anchored bumps is utilized to achieve complete filling of the bump gaps and ensure that thermal stress, thermal deformation and local deposition defects do not accumulate, thereby meeting the requirements of high metal part shape and dimensional accuracy and stability of the printing process.

[0024] Furthermore, in step 4, the metal composite powder material is impact-infiltrated into the modified valve plate at high temperature, and the density of the entire material reaches greater than 99%, and the thickness of the composite layer is 0.5-1 mm.

[0025] Furthermore, in step five, the surface treatment includes grinding and polishing to improve the surface finish and corrosion resistance.

[0026] Furthermore, in step six, the ultrasonic flaw detection criteria include no single display exceeding the reference distance amplitude curve, and no multiple displays exceeding 50% of the reference distance amplitude curve. The multiple displays refer to two or more displays within 13 mm of each other in any direction, that is, each exceeds 50% of the reference distance amplitude curve.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] (1) In the present invention, the overall structure of the flat valve plate is relatively simple, easy to use, has high structural strength and high corrosion resistance. Through the use of smelting treatment, the metal composite powder material is melted and combined to cover the valve plate substrate according to the metal droplet jet additive manufacturing printing method, forming a dense, wear-resistant and corrosion-resistant metal composite layer tightly combined with the valve plate substrate. In addition, the valve plate substrate is an alloy forging, and the high temperature causes the powder material to impact and penetrate into the substrate, so that the density of the entire material is higher, ensuring stability during use.

[0029] (2) In the present invention, the first hypersonic and ultra-low temperature annular hole gas jet cooling technology is used to prepare metal powders with controllable particle size, high powder direct recovery rate, high sphericity rate, and green environmental protection, no wastewater discharge, secondary energy utilization, and low energy consumption.

[0030] (3) In the present invention, the micro-droplet jetting metallurgy is combined with the additive manufacturing technology to make the product have a high density, no thermal deformation, and a mirror-like surface forming effect.

[0031] (4) In the present invention, the wear-resistant, corrosion-resistant and impact-resistant properties can be widely used in the fields of oil extraction, aerospace, shipbuilding, intelligent machinery, energy chemical industry, wind, solar, thermal and hydropower generation, etc., driving the rapid development of metal powder raw material production and additive manufacturing technology, and having significant economic benefits and good social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A perspective view of the present invention;

[0033] Figure 2 It is a flow chart of the present invention.

[0034] Markings in the figure: 1. Valve plate body; 2. T-type connecting groove plate; 3. Flow channel through hole. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] Embodiment 1, refer to Figure 1-2 :A valve plate of an ultra-high pressure wellhead flat valve, comprising:

[0037] Valve plate body 1;

[0038] Two T-shaped connecting groove plates 2 are provided, and the two T-shaped connecting groove plates 2 are respectively fixedly connected to the two ends of the valve plate body 1; and

[0039] The flow passage hole 3 is provided on one side of the outer surface of the valve plate body 1 near the edge.

[0040] In this embodiment: the valve plate body 1, the T-shaped connecting groove plate 2 and the flow channel through hole 3 are integrally formed to ensure the structural strength during use. The size is adjusted accordingly according to the needs to meet the use requirements in different environments. The ultra-high pressure wellhead flat valve is an important wellhead equipment, and its components include a valve body, a valve seat, and a valve plate body 1, wherein the valve plate body 1 is the core component. The frequent opening and closing of the wellhead requires it to have impact resistance, wear resistance, and corrosion resistance.

[0041] A method for preparing a valve plate of an ultra-high pressure wellhead flat valve comprises the following steps:

[0042] Step 1: Appearance design and material preparation: Design the basic data of the valve plate according to the use requirements and working environment, and select the appropriate valve plate substrate and metal composite powder material according to the basic data of the valve plate.

[0043] Step 2: Mechanical rough machining: According to the basic data of the valve plate, the valve plate substrate is cut and rough machined to obtain a preliminary valve plate.

[0044] Step 3: Heat treatment: heat treat the initial valve plate to modify it and obtain a modified valve plate.

[0045] Step 4: Smelting treatment: The metal composite powder material is clad on the surface of the modified valve plate through a metal droplet jet additive manufacturing printing process to obtain a metallurgical symbiotic valve plate.

[0046] Step 5: Surface treatment: Surface treatment is performed on the metallurgical symbiosis valve plate to obtain a finished valve plate.

[0047] Step 6: Quality inspection: Perform ultrasonic flaw detection on the finished valve plate to ensure that the quality meets the requirements.

[0048] Through the technical route of metal-ceramic composite powder preparation-powder mixing-laser droplet injection molding processing, the surface of the nickel-based alloy 718 forging substrate is additively manufactured to form a metallurgical bonded symbiotic valve plate, thereby improving the wear resistance, impact resistance and corrosion resistance of the valve plate, replacing imports and filling the gap in similar domestic products.

[0049] Specifically, in step 1, the basic data of the valve plate includes structure, material and size. The valve plate substrate is a 718 material alloy forging. The main components of the 718 material alloy forging include 55% nickel, 17-21% chromium, 2.8-3.3% molybdenum, 0.8-1.5% titanium and trace metal elements. The trace metal elements include 0-0.35% manganese, 4.87-5.2% niobium, 0-0.045% carbon, 0.4-0.6% aluminum, 0-1% cobalt, 0-0.35% silicon, 0-0.01% phosphorus, 0-0.01% sulfur, 0-0.006% boron, 0-0.23% copper, 0-0.001% lead, 0-0.0005% selenium, 0-0.00005% bismuth, 0-0.003% calcium and 0-0.006% magnesium. The 718 material alloy forging complies with API 6A CRA requirements, and 718 alloy forgings are vacuum refined, and the body material is solid solution and aging treated to 35-40HRC, and the mechanical properties meet the requirements of API 120K. The sealing surface is supersonic sprayed with tungsten carbide, the surface roughness of the spraying is 0.2, and after grinding it is 0.05, the composition ratio: Wc82-90%, Co8-16%, Cr2-6%; the single-sided coating thickness is 0.14-0.16mm, the sealing surface hardness after spraying is HV>1400, and the 120K index requirements are as follows:

[0050] Serial number Project Category 120K Index 1 Yield Strength 827~1000MPa 2 tensile strength ≥1034MPa 3 Elongation ≥20％ 4 Sectional shrinkage ≥35％ 5 hardness 32~40HRC

[0051] Impact performance requirements: QTC <3 requires -60℃ longitudinal impact test, average impact energy 68J, single minimum 61J.

[0052] Specifically, in step 1, the main components of the metal composite powder material include 40% nickel, 1.8% molybdenum, 22% chromium, 0.2% carbon, 24.37% tungsten, 0.6% aluminum, 6% silicon and 0.03% cobalt.

[0053] Specifically, in step 2, the rough cutting processing device includes a lathe and a milling machine, and the rough cutting processing includes milling, turning and drilling.

[0054] Specifically, in step three, the heat treatment includes annealing, normalizing, quenching, tempering and bulk heating to improve the performance of the material.

[0055] Specifically, in step 4, the metal droplet jetting additive manufacturing printing process includes the following steps:

[0056] S201, printing metal droplets of lower temperature at a larger interval so that the printing track consists of a discrete convex point sequence;

[0057] S202. According to the shape requirements of the printed part, high-temperature droplets are selectively deposited between discrete bumps, and the surface tension capillary expansion mechanism of the high-temperature droplets between the anchored bumps is utilized to achieve complete filling of the bump gaps and ensure that thermal stress, thermal deformation and local deposition defects do not accumulate, thereby meeting the requirements of high metal part shape and dimensional accuracy and stability of the printing process.

[0058] Specifically, in step 4, the metal composite powder material is impact-infiltrated into the modified valve plate by high temperature, and the density of the entire material reaches more than 99%, and the thickness of the composite layer is 0.5-1 mm.

[0059] Specifically, in step five, the surface treatment includes grinding and polishing to improve its surface finish and corrosion resistance.

[0060] Specifically, in step six, the ultrasonic flaw detection criteria include no single display exceeding the reference distance amplitude curve, no multiple displays exceeding 50% of the reference distance amplitude curve, and multiple displays refer to two or more displays within 13 mm of each other in any direction, that is, each exceeds 50% of the reference distance amplitude curve.

[0061] When in use, the valve plate body 1 is installed inside the valve body of the flat valve through two T-shaped connecting groove plates 2 for corresponding use. By controlling the position of the flow channel through hole 3, the flow control of the flat valve is completed to ensure the use effect.

[0062] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and wiring layout in detail.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve plate for an ultra-high pressure wellhead flat valve, characterized in that: include: Valve plate body (1); Two T-shaped connecting groove plates (2) are provided, and the two T-shaped connecting groove plates (2) are respectively fixedly connected to the two ends of the valve plate body (1); and A flow channel through hole (3), wherein the flow channel through hole (3) is provided on one side of the outer surface of the valve plate body (1) close to the edge.

2. A method for preparing a valve plate of an ultra-high pressure wellhead flat valve, characterized in that: The following steps are involved: S1. Appearance design and material preparation: design the basic data of the valve plate according to the use requirements and working environment, and select the appropriate valve plate substrate and metal composite powder material according to the basic data of the valve plate; S2, mechanical rough processing: cutting and rough processing are performed on the valve plate substrate according to the basic data of the valve plate to obtain a preliminary valve plate; S3, heat treatment: heat treatment is performed on the preliminary valve plate to modify it and obtain a modified valve plate; S4, smelting treatment: cladding the metal composite powder material on the surface of the modified valve plate through a metal droplet jet additive manufacturing printing process to obtain a metallurgical symbiotic valve plate; S5, surface treatment: performing surface treatment on the metallurgical symbiotic valve plate to obtain a finished valve plate; S6. Quality inspection: Perform ultrasonic flaw detection on the finished valve plate to ensure that the quality meets the requirements.

3. The method for preparing a valve plate of an ultra-high pressure wellhead flat valve according to claim 2, characterized in that: In step S1, the valve plate basic data includes structure, material and size, the valve plate substrate is a 718 material alloy forging, the 718 material alloy forging mainly comprises 55% nickel, 17-21% chromium, 2.8-3.3% molybdenum, 0.8-1.5% titanium and trace metal elements, the trace metal elements include 0-0.35% manganese, 4.87-5.2% niobium, 0-0.045% carbon, 0.4-0.6% aluminum, 0-1% cobalt, 0-0.35% silicon, 0-0.01% phosphorus, 0-0.01% sulfur, 0-0.006% boron, 0-0.23% copper, 0-0.001% lead, 0-0.0005% selenium, 0-0.00005% bismuth, 0-0.003% calcium and 0-0.006% magnesium.

4. The method for preparing a valve plate for an ultra-high pressure wellhead flat valve according to claim 2, characterized in that: In step S1 , main components of the metal composite powder material include 40% nickel, 1.8% molybdenum, 22% chromium, 0.2% carbon, 24.37% tungsten, 0.6% aluminum, 6% silicon and 0.03% cobalt.

5. The method for preparing a valve plate for an ultra-high pressure wellhead flat valve according to claim 2, characterized in that: In step S2, the rough cutting processing device includes a lathe and a milling machine, and the rough cutting processing includes milling, turning and drilling.

6. The method for preparing a valve plate for an ultra-high pressure wellhead flat valve according to claim 2, characterized in that: In step S3, the heat treatment includes annealing, normalizing, quenching, tempering and bulk heating to improve the performance of the material.

7. The method for preparing a valve plate for an ultra-high pressure wellhead flat valve according to claim 2, characterized in that: In step S4, the metal droplet jetting additive manufacturing printing process comprises the following steps: S201, printing metal droplets of lower temperature at a larger interval so that the printing track consists of a discrete convex point sequence; S202. According to the shape requirements of the printed part, high-temperature droplets are selectively deposited between discrete bumps, and the surface tension capillary expansion mechanism of the high-temperature droplets between the anchored bumps is utilized to achieve complete filling of the bump gaps and ensure that thermal stress, thermal deformation and local deposition defects do not accumulate, thereby meeting the requirements of high metal part shape and dimensional accuracy and stability of the printing process.

8. The method for preparing a valve plate of an ultra-high pressure wellhead flat valve according to claim 2, characterized in that: In step S4, the metal composite powder material is impact-infiltrated into the modified valve plate at high temperature, the density of the entire material is greater than 99%, and the thickness of the composite layer is 0.5-1 mm.

9. The method for preparing a valve plate for an ultra-high pressure wellhead flat valve according to claim 2, characterized in that: In step S5, the surface treatment includes grinding and polishing to improve the surface finish and corrosion resistance.

10. The method for preparing a valve plate for an ultra-high pressure wellhead flat valve according to claim 2, characterized in that: In step S6, the ultrasonic flaw detection criteria include no single display exceeding the reference distance amplitude curve, no multiple displays exceeding 50% of the reference distance amplitude curve, and the multiple displays refer to two or more displays within 13 mm of each other in any direction, that is, each exceeds 50% of the reference distance amplitude curve.

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