.

Oil Country Tubular Goods(OCTG)

Oil country tubular goods (octg china) is a family of seamless rolled products consisting of drill pipe, casing and tubing subjected to loading conditions according to their specific application:

Drill pipe is heavy seamless tube that rotates the drill bit and circulates drilling fluid. Pipe segments 30 ft (9m) long are coupled with tool joints. Drill pipe is simultaneously subjected to high torque by drilling, axial tension by its dead weight, and internal pressure by purging of drilling fluid. Additionally, alternating bending loads due to non-vertical or deflected drilling may be superimposed on these basic loading patterns.

Casing pipe lines the borehole. It is subject to axial tension by its dead weight, internal pressure by fluid purging, and external pressure by surrounding rock formations. Casing is particularly exposed to axial tension and internal pressure by the pumped oil or gas emulsion.

Tubing is pipe through which the oil or gas is transported from the wellbore. Tubing segments are generally around 30 ft [9 m] long with a threaded connection on each end.

Corrosion resistance under sour service conditions is a very important OCTG characteristic, especially for casing and tubing.

Typical Manufacturing Processes of OCTG

Continuous mandrel-rolling process and the push bench process for sizes between 21 and 178 mm OD.

Plug mill rolling for sizes between 140 and 406 mm OD.

Cross-roll piercing and pilger rolling for sizes between 250 and 660 mm OD.

These processes typically do not allow the thermomechanical processing customary for the strip and plate products used for welded pipe. Therefore, high-strength seamless pipe must be produced by increasing the alloying content in combination with a suitable heat treatment such as quench & tempering.

Meeting the fundamental requirement of a fully martensitic microstructure even at large pipe wall thickness requires good hardenability. Cr and Mn are the main alloying elements used to produce good hardenability in conventional heat-treatable steel. However, the requirement for good sulphide stress cracking (SSC) resistance limits their use. Mn tends to segregate during continuous casting and can form large MnS inclusions that reduce hydrogen induced cracking (HIC) resistance. Higher levels of Cr can lead to formation of Cr7C3 precipitates with coarse plate-shaped morphology, which act as hydrogen collectors and crack initiators. Alloying with Molybdenum can overcome the limitations of Mn and Cr alloying. Mo is a much stronger hardener than Mn and Cr, so it can easily recover the effect of a reduced amount of these elements.

Traditionally, OCTG grades were carbon-manganese steels (up to the 55-ksi strength level) or Mo-containing grades up to 0.4% Mo. In recent years, deep well drilling and reservoirs containing contaminants that cause corrosive attack have created a strong demand for higher strength materials resistant to hydrogen embrittlement and SCC. Highly tempered martensite is the structure most resistant to SSC at higher strength levels, and 0.75% is the Mo concentration that produces the optimum combination of yield strength and to SSC resistance(1).

Have a Look on the Oil Country Tubular Goods Market

Due to the increasing emphasis on the development of deepwater and offshore reserves, high-quality OCTG products may witness a higher compound annual growth rate across the globe. In the more severe and challenging upstream operations, the requirements for high-quality OCTG products are even higher.

The liberalization of oil and gas by major countries in the world to increase foreign investment, which is boosting the development of the oil and gas industry, may bring an opportunity to the OCTG market.

North America is the main regional market for OCTG products. The extensive development of onshore and offshore oil and gas fields in the region may provide huge business opportunities for companies operating OCTG business during the forecast period.

As one of the most professional oil equipment suppliers, Saigao Groupprovides oilfield cementing tools, octg oil, octg drilling, octg for sale and etc. Saigao products are not only popular in China, but also exported to Russia, Brazil, Australia, South Africa and other countries and regions.



在线联系供应商

至: SHANDONG SAIGAO GROUP CORPORATION
Your E-mail:
消息正文:


Send to other suppliers

Other supplier products

Sucker Rod Pump
Sucker Rod Pump The suck rod pumps can be sunk into wells in sequence as follows: barrel is run down to the setting depth on the tubing and then plunger with the s...
Integral Sprial Heavy Weight Drill Pipe
Integral Sprial Heavy Weight Drill Pipe The drill pipe is the steel pipe with thread at the end, for connecting the drill ground equipment and drilling equipment in drilling bottom or bot...
CASING CENTRALIZER
CASING CENTRALIZER A casing centralizer is a device that is mounted on a casing string to center the casing string within the wellbore. It is one of the casing access...
Oil Field Tubing Pipe
Oil Field Tubing Pipe Product Description API-5CT Tubing Pipe Steel grade: J55/K55/N80/L80/P110/C95/13Cr/28Cr Pipe End: EUE/NU/PRMIUM CONNECTION As one of the most...
Cementing Plug
Cementing Plug Saigao Rubber plug used to separate the cement slurry from other fluids, reducing contamination and maintaining predictable slurry performance. Two...
供应产品

Same products

DM-16BF DM-18BF New cover Electric Sprayer
DM-16BF DM-18BF New cover Electric Sprayer 卖方: Zhejiang Huaqi Information Technology Co., LTD The Electric Knapsack Sprayer is a game-changer in the field of agricultural pest control. Engine...
Simple Round Breeding Cage
Simple Round Breeding Cage 卖方: Zhejiang Huaqi Information Technology Co., LTD The Simple Round Breeding Cage features a durable and lightweight construction, making it suitabl...
叙利亚-细胞储存液氮容器-液氮液位报警器
叙利亚-细胞储存液氮容器-液氮液位报警器 卖方: 河南天之道生物科技有限公司 精准的实验条件与安全的样本存储是科研工作顺利开展的关键要素。其中,细胞储存液氮罐作为实验室不可缺少的一种设备,在样本保存方面发挥着重要的作用。 实验室用的细胞储存液氮罐,航空铝制造,重量轻、占用...
意大利-液氮细胞储存罐-液氮罐液位报警器
意大利-液氮细胞储存罐-液氮罐液位报警器 卖方: 河南天驰仪器设备有限公司 精准的实验条件与安全的样本存储是科研工作顺利开展的关键要素。其中,细胞储存液氮罐作为实验室不可缺少的一种设备,在样本保存方面发挥着重要的作用。 实验室用的细胞储存液氮罐,航空铝制造,重量轻、占用...
埃及-细胞储存液氮罐-液氮液位监测仪
埃及-细胞储存液氮罐-液氮液位监测仪 卖方: Henan Tianzhidao Biological Technology Co., Ltd. 精准的实验条件与安全的样本存储是科研工作顺利开展的关键要素。其中,细胞储存液氮罐作为实验室不可缺少的一种设备,在样本保存方面发挥着重要的作用。 实验室用的细胞储存液氮罐,航空铝制造,重量轻、占用...