CN-117001270-B - Composite bimetal drill rod and preparation method thereof

Abstract

The invention provides a composite bimetal drill rod and a preparation method thereof. The invention provides a preparation method of a composite bimetal drill rod, which comprises the following steps of preparing a bimetal drill rod joint, preparing a bimetal drill rod pipe body, carrying out friction welding on the end part of a first area of the drill rod joint and the end part of a second area of the drill rod pipe body, and after the welding is finished, applying a third corrosion resistant alloy layer on the inner wall of a welding line area of the drill rod joint and the drill rod pipe body, and fusing the third corrosion resistant alloy layer, the first corrosion resistant alloy layer and the second corrosion resistant alloy layer into a whole. According to the preparation method provided by the invention, a complete corrosion-resistant alloy layer is formed on the inner wall of the whole drill rod, so that the corrosion resistance of the inside of the pipe body is effectively ensured, and the comprehensive performance and the service life of the drill rod are improved.

Inventors

• LIU YONGGANG
• YIN CHENGXIAN
• LI WENSHENG

Assignees

• 中国石油天然气集团有限公司
• 西安三环石油管材科技有限公司
• 中国石油集团工程材料研究院有限公司

Dates

Publication Date

20260505

Application Date

20220428

Claims (5)

1. 1. The preparation method of the composite bimetal drill rod is characterized by comprising the following steps of: the method comprises the steps of preparing a drill rod joint body, processing the inner wall of the drill rod joint body to obtain an inner spiral groove, heating the drill rod joint body to 280-320 ℃, preserving heat for 30-45 min, cooling a die-formed first corrosion-resistant alloy pipe body at-40 to-60 ℃, preserving heat for 5-10 min, and compositing the die-formed first corrosion-resistant alloy pipe body to the inner wall of the drill rod joint body through the inner spiral groove to prepare the drill rod joint, wherein the drill rod joint comprises the drill rod joint body and a first corrosion-resistant alloy layer arranged on the inner wall of the drill rod joint body, removing the first corrosion-resistant alloy layer positioned on the inner wall of a first area of the drill rod joint, and the first area is positioned at the welding neck end part of the drill rod joint; preparing a drill pipe body through a high-temperature die forging process, and then compounding a second corrosion-resistant alloy layer on the inner wall of the drill pipe body in a metallurgical compounding mode to prepare the drill pipe body, wherein the drill pipe body comprises the drill pipe body and the second corrosion-resistant alloy layer arranged on the inner wall of the drill pipe body, the second corrosion-resistant alloy layer positioned on the inner wall of a second area of the drill pipe body is removed, and the second area is positioned at the end part of the drill pipe body; Carrying out friction welding on the end part of the first area of the drill rod joint and the end part of the second area of the drill rod pipe body, after welding, coating and welding a third corrosion-resistant alloy layer on the inner walls of the drill rod joint and the drill rod pipe body close to the welding seam area, and fusing the third corrosion-resistant alloy layer with the first corrosion-resistant alloy layer and the second corrosion-resistant alloy layer into a whole so as to form a complete corrosion-resistant alloy layer on the inner walls of the drill rod joint and the drill rod pipe body; And upsetting the drill pipe body before removing the second corrosion-resistant alloy layer positioned on the inner wall of the second area of the drill pipe body.
2. 2. The method of claim 1, wherein the inner helical groove has a groove width of less than 0.5mm and a groove depth of less than 0.3mm.
3. 3. The method according to claim 1, wherein the first, second, and third corrosion-resistant alloy layers have the same thickness, and the corrosion-resistant alloy layers have a thickness of 0.8 to 1.2mm.
4. 4. The method of claim 1, wherein the first region has an axial length of 10-13 mm and the second region has an axial length of 10-13 mm.
5. 5. The method of manufacturing of claim 1, wherein the first, second, and third corrosion resistant alloy layers comprise 316L alloy and the drill pipe joint body and the drill pipe body comprise carbon steel.

Description

Composite bimetal drill rod and preparation method thereof Technical Field The invention relates to a composite bimetal drill rod and a preparation method thereof, and relates to the technical field of drilling tools for oil and gas exploration. Background In the exploration and development of petroleum and natural gas, the stratum contains corrosive media such as CO 2,O2,H2S,Cl- and the like, so that the inner surface of a drill rod is easily corroded, the use safety and the service life of the drill rod are affected, material loss and environmental pollution are caused, the drill rod is punctured or broken when serious, and serious safety accidents are easily caused. At present, the corrosion prevention measures of the drill rod generally comprise organic liquid or powder coating and chromium plating in the drill rod, wherein a coating formed by the organic liquid or powder coating is easy to embrittle, is not resistant to strong acid and alkali, is short in service life, is not resistant to high temperature and abrasion, is easy to damage, is complex in preparation process of chromium plating, needs acid washing, is easy to generate air holes in the electroplating process, is difficult to treat waste water, is unfavorable for environmental protection and ecological environment, and in addition, once the coating formed by the two modes is damaged, the corrosion of the inner wall of the drill rod is aggravated, and the risk of failure of the drill rod is increased. Disclosure of Invention The invention provides a composite bimetal drill rod and a preparation method thereof, which are used for reducing the corrosion risk of the inner wall of the drill rod, improving the comprehensive performance and prolonging the service life of the drill rod. The first aspect of the invention provides a preparation method of a composite bimetal drill rod, which comprises the following steps: Preparing a drill rod joint, wherein the drill rod joint comprises a drill rod joint body and a first corrosion-resistant alloy layer arranged on the inner wall of the drill rod joint body, removing the first corrosion-resistant alloy layer positioned on the inner wall of a first area of the drill rod joint, and the first area is positioned at the end part of a welding neck of the drill rod joint; Removing the second corrosion-resistant alloy layer positioned on the inner wall of a second area of the drill pipe body, wherein the second area is positioned at the end part of the drill pipe body; And carrying out friction welding on the end part of the first area of the drill rod joint and the end part of the second area of the drill rod pipe body, after welding, coating and welding a third corrosion-resistant alloy layer on the inner wall of the welding line area of the drill rod joint and the drill rod pipe body, and fusing the third corrosion-resistant alloy layer, the first corrosion-resistant alloy layer and the second corrosion-resistant alloy layer into a whole. In a specific embodiment, the preparation method of the drill pipe joint specifically comprises the following steps: and (3) preparing a drill rod joint body, processing the inner wall of the drill rod joint body to obtain an inner spiral groove, and compounding the first corrosion-resistant alloy pipe body to the inner wall of the drill rod joint body through the inner spiral groove to obtain the drill rod joint. In one embodiment, the method further comprises: and heating the drill rod joint body to 280-320 ℃, preserving heat for 30-45 min, cooling the die-formed first corrosion-resistant alloy pipe body at-40 to-60 ℃, preserving heat for 5-10 min, and then compounding the pipe body to the inner wall of the drill rod joint body. In one embodiment, the inner helical groove has a groove width of less than 0.5mm and a groove depth of less than 0.3mm. In a specific embodiment, the preparation method of the drill pipe body specifically comprises the following steps: and compounding a second corrosion-resistant alloy layer on the inner wall of the drill pipe body in a metallurgical compounding mode to obtain the drill pipe body. In one embodiment, the method further comprises: upsetting the drill pipe body prior to removing the second corrosion resistant alloy layer located in the second region of the drill pipe body. In a specific embodiment, the thickness of the first corrosion resistant alloy layer, the second corrosion resistant alloy layer and the third corrosion resistant alloy layer is 0.8-1.2 mm. In a specific embodiment, the axial length of the first area and the second area is 10-13 mm. In one embodiment, the first, second, and third corrosion resistant alloy layers comprise 316L alloy, and the drill pipe joint body and the drill pipe body comprise carbon steel. The invention provides a composite bimetal drill rod prepared by the preparation method, which comprises a drill rod joint and a drill rod pipe body which are welded and connected, wherein the drill rod joint