120ksi primary grade sulfur-resistant drill pipe and manufacturing method thereof

A manufacturing method and drill pipe technology, applied in the manufacture of tools, furnace types, furnaces, etc., can solve the problems of low oil and gas production, sulfide stress corrosion cracking, and low strength of sulfur-resistant drill pipes, and achieve the effect of reducing costs

Active Publication Date: 2012-01-25
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, a considerable part contains H 2 H in oil and gas wells of S 2 The S content is very low, and the output of oil and gas is also very low. If the sulfur-resistant drill pipe is used, the production cost will be quite high, but if the API steel grade drill pipe is used, the sulfur-resistant performance cannot be satisfied.
Especially for some ultra-deep wells with low sulfur content, if the strength of 105SS anti-sulfur drill pipe is too low, overload fracture will easily occur; if ordinary 120ksi drill pipe is used, because it cannot resist sulfur, it is prone to sulfide stress corrosion cracking

Method used

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  • 120ksi primary grade sulfur-resistant drill pipe and manufacturing method thereof

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Embodiment 1-6

[0056] Adopt the following steps to prepare the primary sulfur-resistant drill pipe of 120ksi steel grade (the various steel grade compositions of this case embodiment 1-6 and comparative example are shown in Table 1, and wherein comparative example is the commonly used CrMnMo steel drill pipe of prior art):

[0057] (1) Thickening the pipe end to make a pipe body of a thickened drill pipe;

[0058] (2) Quenching: After heating the drill pipe as a whole to 900-950°C, place it on a rotating quenching stand. While the drill pipe is rotating, the inner surface of the drill pipe is cooled by spraying water on the inner surface of the drill pipe and the outer surface of the drill pipe is cooled by laminar flow. Water spray cooling, while controlling the amount of water sprayed at the thickened pipe end of the drill pipe to be different from that of the pipe body so that the pipe body and the thickened pipe end with different wall thicknesses have the same cooling rate;

[0059] (3)...

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Abstract

The invention discloses a 120ksi primary grade sulfur-resistant drill pipe, which comprises the following chemical elements in percentage by weight: 0.24 to 0.30 percent of C, 0.1 to 0.5 percent of Si, 0.8 to 1.4 percent of Mn, 0.8 to 1.4 percent of Cr, 0.5 to 0.8 percent of Mo, 0.05 to 0.10 percent of V, 0.01 to 0.05 percent of Nb, 0.002 to 0.007 percent of Ca, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, and the balance of Fe and other inevitable impurities. Correspondingly, the invention also provides a manufacturing process of the 120ksi primary grade sulfur-resistant drill pipe, wherein the 120ksi primary grade sulfur-resistant drill pipe has a certain capability of sulfur resistance while maintaining the strength of 120ksi grade by controlling a quenching step and a tempering step. Furthermore, the primary sulfur-resistant drill pipe has the advantage of low cost.

Description

technical field [0001] The invention relates to a drill pipe and a manufacturing method thereof, in particular to a sulfur-resistant drill pipe and a manufacturing method thereof. Background technique [0002] Drill pipes for oil and gas drilling are manufactured according to API standards. According to the API SPEC 5DP standard, there are only four steel grades for drill pipes: E, X, G, and S, corresponding to four strengths of 75ksi, 95ksi, 105ksi, and 135ksi respectively. However, the four steel grades of API standard E, X, G, and S are not suitable for drill pipes containing H 2 S oil and gas well drilling. [0003] For H 2 S oil and gas wells and oil fields generally use sulfur-resistant drill pipes for drilling operations. The so-called sulfur-resistant drill pipe refers to the drill pipe product that is resistant to sulfide stress corrosion cracking and should pass the NACE 0177 standard test under the specified tensile load. Sulfur-resistant drill pipe is genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26C21D9/08C21D1/18
Inventor 赵鹏王鸣华王超峰董长富耿鸿明
Owner BAOSHAN IRON & STEEL CO LTD
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