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Heating processing technology for deep sea petroleum drill by adopting conduit joint

A technology for conduit joints and oil drills, used in heat treatment furnaces, heat treatment equipment, drill pipes, etc., can solve problems such as residual internal stress, difficult to harden, and thick wall thickness, and achieve stable quenching quality, sufficient heat treatment, and consistent temperature. Effect

Inactive Publication Date: 2013-07-24
JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pipe joints used in the manufacture of deep-sea oil drills are usually made of high-strength alloy steel. Because the diameter of the pipes used in deep-sea oil drills is large, the diameter of the matching pipe joints is also large, and the wall thickness is very thick. It is difficult to harden through the conventional heat treatment process, and it is easy to remain after quenching. Large value of internal stress, cracks caused by internal stress is an important factor for the failure of conduit joints, once a fracture accident occurs, the economic loss will be huge

Method used

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  • Heating processing technology for deep sea petroleum drill by adopting conduit joint

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Effect test

Embodiment 1

[0013] The diameter of the conduit joint in this embodiment is 450mm, the maximum wall thickness is 36mm, and the material is 25MnV. The deep-sea oil drill of the present invention adopts the heat treatment process of the conduit joint, which includes the following steps: a. Furnace loading: sequentially load the conduit joint blanks In the well-type quenching furnace, the welding neck end is facing downward, and the periphery of the vertical conduit joint and the interval between the upper and lower layers are 25 mm. b. Quenching: b1. Raise the furnace temperature to 885°C within 60±5 minutes, and then keep it warm for 80 minutes. b2. Stir the water in the quenching pool 5 minutes before the blank of the conduit joint is released from the furnace, and control the water temperature at 30°C to 33°C. b3. It takes 8 seconds for the pipe joint blank to be lifted out of the furnace to enter the quenching pool, and the water cooling time is 15 to 16 minutes. The water temperature do...

Embodiment 2

[0015] The diameter of the conduit joint in this embodiment is 940mm, the maximum wall thickness is 78mm, and the material is 25MnV. The deep-sea oil drill of the present invention is produced by adopting the heat treatment process of the conduit joint. It includes the following steps: a. Put it into the well-type quenching furnace, with the welding neck facing down, and the interval between the vertical conduit joint and the upper and lower layers is 50 mm. b. Quenching: b1. Raise the furnace temperature to 895°C within 60±5 minutes, and then keep it warm for 125 minutes. b2. Stir the water in the quenching pool 5 to 7 minutes before the conduit joint blank is released from the furnace, and control the water temperature at 32°C to 36°C. b3. It takes 10-15 seconds for the pipe joint blank to be lifted out of the furnace to enter the quenching pool, and the water cooling time is 17-20 minutes. The water temperature does not exceed 48°C at the end of quenching. c. Normalizing: ...

Embodiment 1 and Embodiment 2

[0016] Example 1 and Example 2 main mechanical properties sampling test table

[0017]

[0018] The above-mentioned embodiment is a preferred example of the present invention. Even if some adjustments are made within the scope of the process index, a similar heat treatment effect can be obtained. The mechanical properties of the heat-treated conduit joint can meet the design requirements, and the first pass rate is above 96%.

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Abstract

The invention discloses a heating processing technology for a deep sea petroleum drill by adopting a conduit joint. The technology comprises the following steps: charging: vertically putting the conduit joint in a well type quenching furnace in the way that a welding neck end faces down, maintaining space between the periphery and upper and lower layers, keeping the furnace temperature at 871-910 DEG C for at least 80 minutes, hoisting out from a hearth and 15 seconds later, feeding into a quenching pool with water temperature of 40-48 DEG C for quenching; performing water cooling for at least 15 minutes; then feeding into the furnace for normalizing treatment at the normalizing temperature of 899-940 DEG C, performing tempering treatment within four hours from the beginning of quenching at the tempering temperature of 575-620 DEG C, wherein the tempering holding time at least lasts 160 minutes; and then hoisting the conduit joint blank out of the hearth and directly placing into a water tank, and cooling to normal temperature. The technology is reasonable in parameter and easy to implement; product quality is stable, and the pass percent is more than 96%.

Description

technical field [0001] The invention relates to a metal heat treatment process, in particular, the invention relates to a heat treatment process for pipe joints used in deep-sea oil drilling. Background technique [0002] Over the past hundred years, oil has been one of the most widely used energy sources. Due to over-exploitation, some easy-to-exploit land and shallow sea oil resources on the earth are becoming increasingly depleted. Petroleum resources in oceans, especially deep sea areas. This kind of strategic industrial transfer needs to be based on advanced deep-sea oil drilling technology and supporting equipment in order to achieve the expected goal. The depth of deep-sea oil drilling is usually several thousand meters, and the length of the pipe joint used also needs to be several thousand meters. Due to its weight, it must also bear a certain amount of torque and damage against the impact of waves, so it has high requirements for the quality index of the pipe join...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/18E21B17/08
Inventor 蒋后平张希平马根生马吉山
Owner JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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