Pup joints are non-standard length pipes used to adjust the height of full-length tubing, drill pipes, line pipes, or casing strings. Typically, the pipe strings are assembled from standard length pipes, approximately 31 feet. When drill strings, production tubing, or casings are placed in the wellbore, a pup joint is added to the string to adjust the length precisely as needed. Pup joints vary in type (such as casing joints, tubing joints, or drill pipe joints) and nominal outer diameter, ranging from 2 inches to 20 inches or more.
Pup joints are shorter than standard casing, tubing, or pipes. They are used to adjust and install tools and various tubular components when specific projects require placing the pipes downhole. The features of pup joints include connections, length, weight, and material grade. Their design and manufacture typically follow the API 5CT standard, ensuring they can withstand the high pressure and harsh conditions of oilfield environments.
Pup joints are widely used in oil and gas drilling. They can provide incremental lengths of 2 feet or 5 feet and can be custom-made to specific lengths as required. These joints can be adjusted according to the needs of the drilling operations, ensuring smooth downhole operations. Common types of pup joints include tubing pup joints and casing pup joints, which are used to adjust the length of tubing and casing, respectively.
Tubing pup joints are designed and manufactured according to API 5CT and are used to adjust the height of the tubing. These joints are made from seamless steel pipes with material grades such as J55, K55, N80, L80, or P110. The size range of tubing pup joints is from 2 3/8 inches to 4 1/2 inches. The threads on pup joints can be 8RD, 10RD, or BTC, with end connections being either NUE or EUE. The standard lengths of tubing pup joints are 2 feet, 3 feet, 4 feet, 6 feet, 8 feet, 10 feet, and 12 feet. Custom lengths for special applications are also available upon request.
Casing pup joints are designed and manufactured according to API 5CT to adjust the height of the casing. These joints are made from seamless steel casing with material grades such as J55, K55, N80, L80, or P110. The size range of casing pup joints is from 4 1/2 inches to 13 3/8 inches. The threads on these joints can be 8RD, 10RD, or BTC. The standard lengths of casing pup joints are 2 feet, 3 feet, 4 feet, 6 feet, 8 feet, 10 feet, and 12 feet. Custom lengths for special applications are also available upon request.
The design and manufacture of pup joints must comply with API SPEC 5CT & 5B and ISO 11960 standards. These standards specify the technical requirements and testing methods for pup joints. Common material grades include J55, K55, N80, L80, P110, and C95. The outer diameter of tubing joints ranges from 2 3/8 inches (60.3 mm) to 4 1/2 inches (114.60 mm), and the outer diameter of casing joints ranges from 4 1/2 inches (114.3 mm) to 20 inches (508 mm). Thread types include BTC, LTC, and STC. The lengths of pup joints can be customized to meet customer requirements, with common lengths being 2, 3, 4, 6, 8, 10, and 12 feet. Surface treatments for pup joints include coatings, and thread protection uses thread protectors. Packaging is typically in wooden boxes or wooden pallets, or customized according to customer specifications.
China, as a significant global industrial manufacturing hub, has numerous excellent pup joint manufacturers. These manufacturers not only provide high-quality pup joints that meet API 5CT standards but also customize products of various specifications and lengths according to customer requirements. Here are some notable Chinese pup joint manufacturers and their strengths:
Baoshan Iron & Steel Co., Ltd. (Baosteel) is the largest and most modernized steel complex in China. With its comprehensive advantages in integrity, talent, innovation, management, and technology, Baosteel has established itself as a world-class steel company in the international steel market. The "World Steel Industry Guide" evaluates Baosteel's comprehensive competitiveness in the world steel industry among the top three, considering it the most promising steel company in the future.
China Petroleum & Chemical Corporation (Sinopec) is one of China's largest integrated energy and chemical companies. It mainly engages in oil and gas exploration and development, pipeline transportation, sales, oil refining, petrochemical, coal chemical, fiber, and other chemical production and product sales, storage, and transportation. Sinopec is China's largest oil and gas producer; its refining capacity ranks first in China.
Nansteel is an ISO 9001:2008 certified company located in Changsha, Hunan Province, China. It is a well-known manufacturer, stockist, and exporter of seamless carbon steel pipes, seamless stainless steel pipes, structural profiles, fittings, and OCTG pipes, including stainless steel, carbon steel, and alloy steel. The company has passed ISO9001, OHSAS18001, ISO14001, API 5L, API 5CT, CE, DNV, and other certifications. ABS, FCP, and other certifications based on customer requirements and drawings. Nansteel's products are widely used in nuclear power plants, thermal power plants, atomic energy power plants, oil and gas, petrochemicals, fertilizers, chemicals, and pharmaceuticals.
Hunan Standard Steel Co., Ltd. mainly engages in steel manufacturing and sales, producing seamless steel pipes, ERW steel pipes, double-sided submerged arc steel pipes, and spiral welded steel pipes, with an annual production capacity of 200,000 tons of various steel pipes. It also engages in oil and gas pipelines, marine equipment, pipeline fittings, automation control systems, offshore drilling platforms, power plant equipment, and related supporting services. Multiple steel pipe production lines serve the production of steel pipe products: raw material production mainly includes two steel plate and pipe blank production bases; steel pipe manufacturing includes two seamless steel pipe plants and two welded steel pipe plants.
BAOWI STEEL MANUFACTURING CO., LTD is committed to providing a full range of pup joint products that meet API 5CT specifications and are specifically designed for the oil and gas industry. We understand the importance of quality and performance in harsh drilling and production environments. Our pup joint products cover various grades, including H40, J55, K55, N80, L80, C90, T95, P110, C110, Q125, and 13Cr, to meet various strength and performance requirements, ensuring the smooth progress of your projects. Our product line is extensive, including tubing and casing joints, to meet the needs of different downhole operations. We use high-quality API-compliant seamless tubing to manufacture API casing and tubing joints, ensuring every product meets API Spec 5CT standards. Whether you are engaged in drilling or production operations, Baowisteel can provide you with high-quality, reliable pup joint solutions.
Chinese pup joint manufacturers hold an important position in the global oil and gas industry. With advanced production equipment and technology, strict quality control, diverse product specifications and materials, customized services, and excellent after-sales service, Chinese pup joint manufacturers can provide high-quality pup joint products to global customers. As the global oil and gas industry develops, Chinese pup joint manufacturers will continue to play a crucial role and contribute to the industry's growth.