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Casing pipe for geothermal well and manufacturing method thereof

A technology for geothermal wells and casings, which is applied in the field of low-alloy steel manufacturing, can solve problems such as high cost, inability to withstand high temperature and corrosion resistance, and achieve improved bonding force, improved pitting corrosion resistance, and improved oxidation resistance and corrosion resistance. Effect

Active Publication Date: 2021-03-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to overcome the disadvantages of high cost and high temperature and corrosion resistance of the commonly used geothermal well pipe anticorrosion methods in the above-mentioned prior art, and provide a geothermal well casing and its manufacturing method

Method used

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  • Casing pipe for geothermal well and manufacturing method thereof
  • Casing pipe for geothermal well and manufacturing method thereof
  • Casing pipe for geothermal well and manufacturing method thereof

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Embodiment Construction

[0024] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the present invention, rather than Full examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that the terms in the specification and claims of the present invention are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those described herein. Furthermore, the...

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Abstract

The invention discloses a casing pipe for a geothermal well and a manufacturing method thereof, and belongs to the technical field of low alloy steel manufacturing. The C content is controlled, the strength is ensured, the high temperature and corrosion resistance of a pipe are improved, the lower the P content and the S content are, the better the corrosion resistance is, the content of Cr, Mo, Wand Nb elements is adjusted, the interatomic bonding force is improved through solution strengthening, the activation energy is increased, a stable second phase is formed, the thermal stability of materials is improved, and meanwhile certain corrosion resistance is achieved. Si, Al and other elements can form a compact oxide structure, and the grain size can be controlled. The performance indexesof an obtained steel pipe are as follows: the yield strength is greater than 552 MPa, the tensile strength is greater than 655 MPa, and the Charpy impact energy of a V-shaped notch sample is greaterthan 30 J; and the average corrosion rate is less than 0.2 mm / a. Therefore, the casing pipe for the geothermal well can meet the use requirements of the current market and the future market for casingpipes for geothermal well.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel manufacturing, and relates to a casing for geothermal wells and a manufacturing method thereof. Background technique [0002] Geothermal resources are a new type of renewable, environmentally friendly and clean energy with great application potential. With the advancement of technology, the development and application of geothermal resources will create a new form of energy utilization, which can not only optimize the energy consumption structure, save resources, but also help improve the environment, and have a very significant effect on pollution control and haze reduction. In recent years, with the increasing attention to energy and the environment, the development and utilization of geothermal resources has also become a key measure to realize the simultaneous development of fossil energy and new energy from the perspective of low-carbon economy. The working conditions of geothermal w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54B21C37/06C22C33/04
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/50C22C38/48C22C38/42C22C38/06C22C38/54C22C33/04B21C37/06Y02E10/10
Inventor 王蕊李东风施宜君韩军杨鹏张益铭
Owner BC P INC CHINA NAT PETROLEUM CORP
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