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Local additive manufacturing method of bimetal composite oil well pipe screwed joint

A threaded joint and additive manufacturing technology, which is applied in the field of oil drilling and production equipment, can solve problems such as small size, ensure material strength, avoid corrosion and leakage later, and realize structural integrity of threaded joints and high-pressure gas tightness Effect

Active Publication Date: 2020-11-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Laser selective melting technology (SLM) is currently the most mature and widely used technology, but its manufacturing size is small. At present, the maximum forming range of the dual laser system of the German Hofmann Group is only 800mm×400mm×500mm

Method used

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  • Local additive manufacturing method of bimetal composite oil well pipe screwed joint
  • Local additive manufacturing method of bimetal composite oil well pipe screwed joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Embodiment 1: Select nickel-based alloy powder, the nickel-based alloy powder has a particle size of about 75-100 μm spherical nickel-based powder, protected by argon to ensure that the oxygen content is less than 50 ppm. The laser power is 1.0kW~1.2kW, the scanning speed is 5mm / s, the laser spot diameter is 2mm, the synchronous powder feeding speed is 0.4g / min-0.7g / min, and the multi-pass overlapping rate is 40%; the additive manufacturing process The scanning path is set according to the topography of the sealing surface 50 and the torque shoulder surface 30, and the corrosion-resistant alloy layers are accumulated layer by layer. The powder feeding rate used in the first pass is about 0.7 / min, and the accumulation thickness of a single pass is about 0.2mm, so as to reduce the dilution rate. The powder feeding rate used in the rest of the passes is about 0.4g / min, and the thickness of the accumulated material in a single pass is less than 0.1mm, and the average total t...

Embodiment 2

[0033] Embodiment 2: Select nickel-based alloy powder, nickel-based spherical powder with a particle size of 75-100 μm, and protect it with argon to ensure that the oxygen content is less than 50 ppm. The laser power is 1.0kW~1.2kW, the scanning speed is 5mm / s, the laser spot diameter is 2mm, the synchronous powder feeding speed is 0.4g / min-0.7g / min, and the multi-pass overlapping rate is 40%; the additive manufacturing process Set the scanning path according to the shape of the sealing surface 50 and the torque shoulder surface 30, and accumulate the corrosion-resistant alloy layer layer by layer; the powder feeding rate used in the first pass is 0.7 / min, and the single-pass accumulation thickness is 0.2mm, reducing the dilution rate . The powder feeding rate used in the rest of the passes is 0.4g / min, the thickness of the single-pass accumulation material is less than 0.5mm, and the average total accumulation thickness is 1.5mm through the multi-pass processing.

Embodiment 3

[0034] Embodiment 3: Select nickel-based alloy powder, nickel-based spherical powder with a particle size of 75-100 μm, and protect it with argon to ensure that the oxygen content is less than 50 ppm. The laser power is 1.0kW~1.2kW, the scanning speed is 5mm / s, the laser spot diameter is 2mm, the synchronous powder feeding speed is 0.4g / min-0.7g / min, and the multi-pass overlapping rate is 40%; the additive manufacturing process Set the scanning path according to the shape of the sealing surface 50 and the torque shoulder surface 30, and accumulate the corrosion-resistant alloy layer layer by layer; the powder feeding rate used in the first pass is 0.7 / min, and the single-pass accumulation thickness is 0.2mm, reducing the dilution rate . The powder feeding rate used in the rest of the passes is 0.5g / min, the thickness of the single-pass accumulation material is 0.08mm, and the average total accumulation thickness is 2.0mm through the multi-pass processing process.

[0035] The...

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Abstract

The invention discloses a local additive manufacturing method of a bimetal composite oil well pipe screwed joint. The screwed joint comprises a thread, a sealing surface, a torque shoulder and a transition cylindrical surface between the thread and the sealing surface. The method comprises the steps that a position is continuously turned to remove the set machining amount to serve as the thicknessof a covering layer for additive manufacturing after the position continued to the torque shoulder from the sealing surface and ended on an inner pipe is machined to the set size; a laser directionalenergy deposition method is adopted, and corrosion-resistant alloy layers are stacked on the sealing face and the torque shoulder layer by layer to reach the designed size; after an outer pipe is connected and screwed with a coupling, the coupling is in interference fit with the corrosion-resistant alloy layers on the sealing surface and the torque shoulder surface; the yield strength of the corrosion-resistant alloy layers is the same as that of the outer pipe material; and a sealing structure is machined through the additive manufacturing technology, it is guaranteed that corrosive media inthe pipe do not make contact with the outer pipe, meanwhile, the structure and sealing integrity of the screwed joint are guaranteed, enough machining precision and material strength are achieved, and subsequent machining and heat treatment procedures are not involved.

Description

technical field [0001] The invention belongs to the field of oil drilling and production equipment, and in particular relates to a local additive manufacturing method for a bimetal composite oil well pipe threaded joint. Background technique [0002] Reservoir media in high-pressure gas fields generally contain corrosive media such as hydrogen sulfide, carbon dioxide, and chloride ions. In the process of widely used acid fracturing stimulation operations, it is necessary to inject strong corrosive media such as hydrofluoric acid and hydrochloric acid into the production formation. Gas well production and A large number of threaded joints involved in the work string need to maintain high-pressure gas and liquid tightness in the corrosive environment inside the pipe. A typical sealing special threaded joint consists of three parts: thread, sealing surface and torque shoulder; among them: the thread interference fit realizes the screw-in make-up and structural integrity of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/24B22F7/08B22F5/12
CPCB22F3/24B22F7/08B22F5/10B22F2003/247Y02P10/25
Inventor 王鹏胡美娟吉楠罗金恒尹成先
Owner BC P INC CHINA NAT PETROLEUM CORP
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