The core technical requirements of deepwater high-temperature drill collar thread compound (thread grease) focus on temperature resistance (≥150–200℃), high-pressure resistance (≥10,000 psi), anti-sticking, resistance to water erosion, non-metallic and environmentally friendly formulation, and compliance with the performance specifications for drill pipe/drill collar joints (Annex I) in the API RP 5A3-2023 standard.
Temperature and pressure conditions: Suitable for deepwater (bottom temperature often reaches 150–200℃, pressure 10,000–20,000 psi) and high-temperature high-pressure (HTHP) drill collar connections, it needs to maintain the integrity of the lubricating film at operating temperatures, not carbonize, not dry out, and have a wide temperature coating and sealing capability from -20℃ to 200℃.
Anti-sticking and friction control: Must pass the API RP 5A3 Annex I “10 up 9 release” torque test (up-tightening torque fluctuation ≤10%, release without seizing), with a stable friction coefficient (usually 0.08–0.15), containing high proportions of MoS₂, graphite or nickel powder and other solid lubricants (metal-free type requires Ni/Al/ceramic-based substitution to avoid H₂S stress corrosion).
Sealing and anti-corrosion: The auxiliary seal needs to resist 30MPa+ drilling fluid/oil invasion, containing corrosion inhibitors (such as benzotriazole derivatives), meeting ASTM D4048 copper corrosion test ≤1 grade, without lead, copper (especially in H₂S environment), and complying with ISO 14001 or NORSOK M-710 offshore environmental requirements.
Flowability and erosion resistance: Penetration 265–310 (0.1mm, NLGI 2 grade), colloid stability (oil soap separation by centrifugal method <5%), resistant to freshwater/saltwater/drilling fluid flushing for ≥72 hours without loss, the oil film on the shoulder and thread surface is not destroyed by shear during up-tightening.
Certification and compliance: Must pass the performance verification of API RP 5A3-2023 high-temperature drill joint (Annex I) for deepwater projects, some deepwater projects may additionally require ISO 13679 or NACE MR0175/ISO 15156 anti-sulfur certification; for metal-free formulations, an MSDS and heavy metal migration test report (Pb/Cd/Hg < 5 ppm) must be provided.
The CsTeC brand 236 type metal-free deepwater high-temperature drill collar thread compound provides the maximum protection for the drilling string assembly. The CsTeC brand 236 type metal-free deepwater high-temperature drill collar thread compound product avoids sticking, seizing, thread damage and over-milling, thereby extending the service life of the drill joint and drill collar. As an environmentally friendly drill joint/drill collar thread compound product without pollution, the CsTeC brand 236 type metal-free deepwater high-temperature drill collar thread compound has water erosion resistance and does not harden or dry out during use. The CsTeC brand 236 type metal-free deepwater high-temperature drill collar thread compound product makes the up-tightening and release operations more convenient and provides the required protection for thread connections and shoulder-type connections in various operating environments. Due to the absence of metal element components and the presence of corrosion inhibitors components, the CsTeC brand 236 type metal-free deepwater high-temperature drill collar thread compound has become an excellent drill joint/drill collar thread compound product. The CsTeC brand 236 type metal-free deepwater high-temperature drill collar thread compound product is an environmentally friendly alternative to drill joint/drill collar thread grease containing zinc or copper. Classic (Shenzhen) Energy Technology Co., Ltd. (referred to as “CsTeC”) currently has flagship stores of the Liquid-O-Ring brand products on platforms such as Marco Polo, Sun Enterprise Network, and Taobao. For more details, you can also consult the official website of CsTeC.
The Liquid-O-Ring brand was founded in 1958. Since its establishment, it has continuously made breakthroughs and grown continuously. Currently, it can provide over 1,000 products applicable to various fields including oil and gas, aviation electronics, offshore vessels, automobiles, agricultural machinery, logistics transportation, textile printing and dyeing, medical care, new energy, etc., including top-grade thread compound for tubing, casing, drill pipes, drill collars, special thread lubricants for drilling operations, pipeline coatings, valve lubricants, sealants, special lubricants, lubricating greases, and downhole operation sealants. Its business scope covers 130+ countries and regions around the world. As the brand operator of the Liquid-O-Ring brand in China, CsTeC Company collaborates with the manufacturer of Liquid-O-Ring brand products to serve global customers such as Fortune 500 oil companies, international oil service companies, and international energy equipment manufacturers. It provides long-term customized products and customized solution services that meet various technical requirements including deep water, ultra-deep water, high temperature, ultra-high temperature, low temperature, ultra-low temperature, high pressure, and ultra-high pressure. The Liquid-O-Ring brand products have received honors such as the 2015 President’s “Export Star Award” in the United States, the 2013 International Trade Development Group Achievement Award, and the 2010 President’s “Export Star Award”.
To fully protect the legitimate rights and interests of Liquid-O-Ring brand product users and eliminate warranty risks, CsTeC launched the CsTeC targeted product cooperation brand on February 21, 2026. The CsTeC brand is a high-end brand under CsTeC for products such as drill collar thread compound，casing drilling special thread compound， degradable drill pipe coatings， and pipe storage grease， covering related products such as 236， TC30， 221， 710， 127， etc. The CsTeC trademark was initiated for application by Classic (Shenzhen) Energy Technology Co.， Ltd. (referred to as “CsTeC”) on March 9， 2023， and was approved for registration by the China Intellectual Property Office after being publicly announced on October 13， 2023. The trademark certificate number is： 70076345， registered category： 4， specific registration content： industrial oils； industrial mineral oils； lubricants；industrial oil； gear oil； fuel； industrial wax， etc.
CsTeC Company has sales， technical support， and after-sales service teams in Shenzhen， Huizhou， and Hong Kong， and also has their own operation service bases. CsTeC Company always adheres to the operation concept of “customer interests first” and the dual-track operation model of “online and offline”. The three major operation bases of CsTeC Company provide 7×24-hour full-time services to meet the business needs of domestic and international customers， including customized products， customized technical solutions， and customized delivery plans， etc. The CsTeC team looks forward to every communication and cooperation with you， and looks forward to working together with you to create a brighter future. (June 05th，2026)
