“before 9000 Mi ultra deep well，Proportion of imported casing 60%，Now descend to 8%，And the price is also lower than abroad 12%。”10 moon 15 day，The Chairman of Baoji Steel Pipe“China Petroleum Pipeline Engineering 30 year”Achievement Exhibition，Use a set of data to give a thumbs up for localization。
from“stranglehold”to“Reverse export”，The Chinese oil casing is working 30 year。2025 year，Domestic high resistance to compression、High alloy、Special thread type three high-end casing production 158 ten thousand tons，year-on-year increase 21%，The localization rate has historically reached 92%，Directly save foreign exchange expenses 6.7 USD100mn。
Deepearth Tower 1 Well is the largest“Trial field”。well depth 9010 rice，Bottom hole temperature 200℃，Well pressure 138MPa，Propose for casing“Four Chao”requirement：Ultra high resistance to compression、Ultra-high internal pressure、Ultra high torque、Ultra high sealing。Baosteel Group and China Petroleum Engineering Research Institute，develop V140-3Cr High alloy casing，yield strength 1034MPa，Anti crushing strength 159MPa，Threaded connection gas seal 70MPa，Success rate of one-time downhole drilling 100%。
Shale gas horizontal wells are a test“resilience+inexpensive”。Changning—The horizontal segment of Weiyuan block is generally 2500—3000 rice，Dog leg degree 25°/30m，The casing needs to withstand repeated bending+Fracturing internal pressure 100MPa。Tianjin Steel Pipe launches 110TS-SS Sulfur resistant special threaded casing，adopt 0.015% Ultra-low sulfur smelting+Molybdenum niobium composite microalloy，Lower cost compared to imported products of the same level 14%，2025 Applied annually 6.8 ten thousand tons，Accounting for the total amount of shale gas casing in Sichuan and Chongqing 31%。
Behind the technological breakthrough is“one-stop service”innovation chain。
Smelting process：Baosteel 300 Implementation of ton converter 0.3ppm Grade ultra-low oxygen+Modification of calcium treated inclusions，Purity comparable to Germany and Japan；
Continuous casting process：φ 450mm Center segregation index of large round billet≤1.05，Lay the organizational foundation for subsequent pipe rolling；
Pipe rolling process：The first domestic set 258PQF Three roll continuous rolling mill，Wall thickness accuracy±5%，compare API Standard improvement 40%；
Heat treatment process：Offline control cooling+Dual phase zone quenching，Poor hardness of the entire tube≤3 HRC，Improved impact toughness 28%；
Thread link：domestic CNC High speed threading machine 120 second/head，dimensional deviation≤0.025mm，Reaching the international first-line level。
Smelting process：Baosteel 300 Implementation of ton converter 0.3ppm Grade ultra-low oxygen+Modification of calcium treated inclusions，Purity comparable to Germany and Japan；
Continuous casting process：φ 450mm Center segregation index of large round billet≤1.05，Lay the organizational foundation for subsequent pipe rolling；
Pipe rolling process：The first domestic set 258PQF Three roll continuous rolling mill，Wall thickness accuracy±5%，compare API Standard improvement 40%；
Heat treatment process：Offline control cooling+Dual phase zone quenching，Poor hardness of the entire tube≤3 HRC，Improved impact toughness 28%；
Thread link：domestic CNC High speed threading machine 120 second/head，dimensional deviation≤0.025mm，Reaching the international first-line level。
“technological autonomy”Also driving“Standard sea going”。From PetroChina、Led by China Steel Research Institute ISO 24598《Oil and gas industry High anti extrusion casing》2025 year 7 Monthly official release，For the first time“China coefficient”Incorporate into international standards，This marks that the rules of the high-end casing game are no longer monopolized by the United States and Europe。
however，The last mile of localization is still ahead“high-end materials+Green certification”。nickel-based alloy 825、titanium alloy Gr9 Waiting for extreme working conditions with casing still 100% Import；European Union CBAM、North America 45V Low carbon trade barriers such as green hydrogen subsidies，Forcing enterprises 2026 Completed before the year“carbon footprint”verify。Baosteel Zhanjiang“Zero emission factory”Demonstration has been provided：Carbon emissions per ton of steel 0.28tCO₂，Reduced compared to traditional processes 78%，2025 year Q4 We will supply in bulk to Europe 3 ten thousand tons，premium 25 dollar/ton。
It is foreseeable，with“Deepearth Tower 2 well”（Design well depth 10000 rice）Drilling is about to begin，The domestication rate of high-end casing in China is expected to increase 2027 Annual breakthrough 95%，And in the Middle East、The Central Asian market and Tenaris、Vallourec Engage in positive competition。
