135 steel-level drill rod connector and heat treatment process thereof

A technology of drill pipe joints and steel grades, which is applied in the direction of drill pipes, drill pipes, drilling equipment, etc., can solve the problems that cannot meet the performance requirements of 135 steel grade drill pipe joints, and achieve the effect of stable mechanical properties and wide process range

Inactive Publication Date: 2011-08-03
SHANGHAI HILONG DRILL PIPE MATERIALS INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The test results show that the commonly used joint material 37CrMnMo, when its yield strength is 140-160Ksi (965-1100MPa), the

Method used

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  • 135 steel-level drill rod connector and heat treatment process thereof
  • 135 steel-level drill rod connector and heat treatment process thereof

Examples

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Example Embodiment

[0012] According to the chemical composition requirements of the present invention, three heats of steel were refined. Then continuous casting and rolling into round steel that meets the requirements. Cut the round steel to a certain length and forge it into NC50 joint blank. Take 10 joints from each of the three batches of rough machining and 10 joints of the same specification 37CrMnMo, and heat treat them in batches. After heat treatment, samples are taken for chemical analysis, tensile and impact tests.

[0013] The heat treatment process of the present invention is as follows: raise the roughly machined joint blank from room temperature to 920-960°C in 80-100 minutes, keep it warm for 0.5-1.5 hours, put it into a 30-50°C oil-based quenching medium, and fully Cool it, then raise it from room temperature to 550-620°C in 50-70 minutes, keep it warm for about 1.5-2.5 hours, and then take it out of the oven.

[0014] The mechanical properties (the average value of each 10 jo...

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Abstract

The invention relates to a 135 steel-level drill rod connector and a heat treatment process thereof. The drill rod connector comprises the following components in percentage by weight: 0.25-0.32 percent of C, 0.30 percent of or less Si, 0.35-0.80 percent of Mn, 0.015 percent of or less P, 0.008 percent of or less S, 0.15-0.80 percent of Mo, 0.00-1.00 percent of Ni, 0.90-1.50 percent of Cr, 0.30 percent of or less Al, 0.05 percent of or less Nb, 0.10 percent of or less V and the balance of Fe and unavoidable trace elements. The heat treatment process comprises the steps of: heating a roughly processed connector blank to 920-960 DEG C from the room temperature, preserving heat for 0.5-1.5 hours, putting the connector blank into a high-grade oil base quenching medium at 30-50 DEG C, fully cooling the connector blank, then heating the connector blank to 550- 620 DEG C from the room temperature for 50-70 minutes, preserving heat for 1.5-2.5 hours, and then discharging the connector. After heat treatment, the mechanical performances are as follows: the yield strength is 140-160 Ksi (965-1100 MPa), the elongation percentage is larger than or equal to 17 percent, the drill rod connector is longitudinal and is at 20 DEG C below zero and has full size, and the charpy impact energy is higher than or equal to 100 Joules.

Description

technical field [0001] The invention relates to a high-strength and high-toughness drill pipe joint used in drilling, especially deep wells and ultra-deep wells, and a heat treatment process thereof. The joint of the invention is 135 steel grade and belongs to the technical field of oil and gas drilling. Background technique [0002] With the development of drilling technology and the gradual reduction of shallow easy-to-exploit oil and gas layers, the drilling depth is increasing. In recent years, a large number of 7000-8000m ultra-deep wells have been drilled in my country, and my country's offshore drilling is also gradually moving towards deep-sea development. In order to be able to operate under such harsh well conditions, the oil field hopes to provide high-strength and high-toughness drill pipes. However, the currently commonly used drill pipes of the highest steel grade S-135 that meet the requirements of the American Petroleum Institute (API) cannot meet its require...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/46C22C38/48E21B17/02
Inventor 袁鹏斌欧阳志英余世杰乔晓堂
Owner SHANGHAI HILONG DRILL PIPE MATERIALS INST
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