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Nickel-based alloy powder for remanufacturing of sealing surface of liquid inlet and outlet valve of oilfield water injection pump and method thereof

An oilfield water injection, nickel-based alloy technology, applied in manufacturing tools, metal processing equipment, welding media, etc., can solve the problem that the hardness and corrosion resistance cannot meet the production needs of oilfield water injection pumps, cannot meet the requirements of oilfield working conditions, and the sealing surface pit grooves, corrosion points and other problems, to achieve high bonding strength, low cost, and improve the effect of impact resistance

Active Publication Date: 2021-01-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The base material is 2Cr13 stainless steel, which has a certain hardness and wear resistance, but the content of bacteria, sulfide and solid particles in the water injected from Changqing Oilfield is relatively high, and the general working pressure of the water injection pump is between 15MPa and 20MPa, and the combined valve is in the In this environment, frequent collisions with the valve plate will cause pits and corrosion spots on the sealing surface, resulting in leakage, reduced sealing performance, and affecting the normal water injection volume, which cannot meet the requirements of the oilfield working conditions. However, there is currently no effective repair method in the oilfield. Generally, direct replacement is performed, but this is costly and labor-intensive
[0003] Among the existing conventional metal powders, there are iron-based, cobalt-based, etc. The hardness and corrosion resistance of cobalt-based alloy powders cannot meet the production needs of oilfield water injection pumps, and domestic iron-based alloy powders cannot meet the production needs, while imported iron-based alloy powders Hardness and corrosion resistance are high, but the cost is high

Method used

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  • Nickel-based alloy powder for remanufacturing of sealing surface of liquid inlet and outlet valve of oilfield water injection pump and method thereof
  • Nickel-based alloy powder for remanufacturing of sealing surface of liquid inlet and outlet valve of oilfield water injection pump and method thereof
  • Nickel-based alloy powder for remanufacturing of sealing surface of liquid inlet and outlet valve of oilfield water injection pump and method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add C1.2g (2%), Ti 0.25g (0.417%), Al 0.6g (1%), Cr10.8g (18%), S 0.3g (0.5%), Si 6.5g to the metal powder mixer (10.8%), Ni 40.35g (67.2%), temperature is set as 65 ℃, mixing rotating speed 600 revs / min, mixing time 15min obtains 60g gray new nickel base alloy powder. Using the powder as the surface material, the sealing surface of the inlet and outlet valves was repaired, and the hardness of the obtained surface coating reached 54HRC, which exceeded the hardness of the sealing surface of the original inlet and outlet valve (45HRC); The corrosion time of the original sealing surface coating and the new sealing surface coating of the valve is 75 hours and 100 hours respectively. The corrosion resistance has been greatly improved and meets the design requirements.

Embodiment 2

[0040] Add C1.6g (2.67%), Ti0.3g (0.5%), Al0.5g (0.83%), Cr11.4g (19%), S0.4g (0.67%), Si4.5g to the metal powder mixer (7.5%), Ni 41.3g (68.8%), temperature is set as 65 ℃, mixing speed 600 revs / min, mixing time 15min obtains 60g gray new nickel base alloy powder. Using the powder as the surface material, the sealing surface of the inlet and outlet valves was repaired, and the hardness of the obtained surface coating reached 56HRC, which exceeded the hardness of the sealing surface of the original inlet and outlet valve (45HRC); The corrosion time of the original sealing surface coating and the new sealing surface coating of the valve is 75 hours and 102 hours respectively, and the corrosion resistance has been greatly improved, which meets the design requirements.

Embodiment 3

[0042] Add C1.4g (2.3%), Ti 0.27g (0.45%), Al 0.6g (1%), Cr10.7g (17.8%), S 0.38g (0.63%), Si 6.5g to the metal powder mixer (10.5%), Ni 40.15g (66.9%), temperature is set as 65 ℃, mixing rotating speed 600 revs / min, mixing time 15min obtains 60g gray new nickel base alloy powder. Using the powder as the surface material, the sealing surface of the inlet and outlet valves was repaired, and the hardness of the obtained surface coating reached 52HRC, which exceeded the hardness of the sealing surface of the original inlet and outlet valve (45HRC); The corrosion time of the original sealing surface coating and the new sealing surface coating of the valve is 75 hours and 106 hours respectively, and the corrosion resistance has been greatly improved, which meets the design requirements.

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Abstract

The invention discloses nickel-based alloy powder for remanufacturing of a sealing surface of a liquid inlet and outlet valve of an oil field water injection pump and a method thereof. The nickel-based alloy powder comprises the elements of, in percentage, 1.8-3.2% of C, 0.4-0.8% of Ti, 0.7-1.0% of Al, 17.8-21.6% of Cr, 0.4-0.8% of S, 7.5-11.0% of Si, and the balance Ni. An advanced repair technology is adopted to form a high-performance coating on the sealing surface of the waste liquid inlet and outlet valve, so that the waste liquid inlet and outlet valve is reused, the cost is reduced, meanwhile, the strength and corrosion resistance of the sealing surface of the liquid inlet and outlet valve are improved, and the corrosion resistance requirement of an oilfield water injection system is met. The invention relates to a design of nickel-based alloy powder for improving impact resistance and corrosion resistance of the surface of the liquid inlet and outlet valve of the oilfield waterinjection pump by using an argon arc welding technology.

Description

technical field [0001] The invention relates to the technical field of remanufacturing working surfaces of oilfield mechanical equipment components, in particular to a nickel-based alloy powder for remanufacturing the sealing surface of an inlet and discharge valve of an oilfield water injection pump and a method thereof. Background technique [0002] The inlet and outlet valves in the water injection pump of Changqing Oilfield are vulnerable parts. During the working process, the sealing surface and the valve plate form a seal, and the liquid flow channel is changed by opening and closing in each stroke, so that the liquid flow is continuous Enter the water injection pump to complete the delivery. The base material is 2Cr13 stainless steel, which has a certain hardness and wear resistance, but the content of bacteria, sulfide and solid particles in the water injected from Changqing Oilfield is relatively high, and the general working pressure of the water injection pump is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40C22C19/05
CPCC22C19/058B23K35/304B23K35/40
Inventor 程颢薛建强郑刚王林平王曼覃川晏耿成冯建设
Owner PETROCHINA CO LTD