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May 22, 2026How to check buttress threadsCheck buttress threads by measuring lead, taper, and height with specialized dial gauges and verifying the standoff using API-certified ring or plug gauges. Additionally, perform a -
May 22, 2026What are the different types of API threadsAPI threads are primarily categorized into Casing (STC, LTC, BTC), Tubing (EUE, NUE), and Rotary Shouldered Connections for drill pipe (NC, REG, FH). These standardized profiles en -
May 22, 2026What is LTC threadLTC (Long Thread Coupled) is a standard API casing connection thread featuring an 8-round thread design. By utilizing a longer engagement length compared to Short Thread Coupled (S -
May 22, 2026What is premium connectionIn the field of oil tubular goods, the most commonly used meaning of Premium connection is high-performance special threaded joint for tubing and casing in oil and gas wells. Diffe -
May 22, 2026What are the different types of casing connectionIn the OCTG industry, casing connections are mainly categorized into 3 types: conventional API standard connections (STC/LTC/BTC) for mild conventional wells, API premium connect -
May 22, 2026What is slotted pipe used forSlotted tubing (slotted liner) is a special downhole tubular product that conforms to the requirements of API 5CT standard. It is precision-machined with slots of preset specificat -
May 21, 2026What is Hydro Test for LSAW PipeThe Hydrostatic Test for LSAW pipe is a critical quality control process performed according to standards such as API 5L, involving the application of internal water pressure—typic -
May 21, 2026Differences between Casing coupling and tubing couplingCasing couplings are large-diameter (>4.5") permanent connectors using BTC or LTC threads to support structural loads and formation pressure, whereas tubing couplings are smaller ( -
May 21, 2026What is the difference between upset and non upset tubingThe core difference is that Upset Tubing (EUE) features forged, thickened ends to ensure the 8rd connection is as strong as the pipe body, while Non-Upset Tubing (NUE) machines 10r -
May 21, 2026What is EUE Oil TubingEUE tubing is forged by adding thickness (Upset) to the end of the tubing to ensure that the physical strength at the 8-threaded connection is equivalent to or higher than that of -
May 21, 2026What is an EUE threadEUE (External Upset End) is an 8-tooth circular threaded joint made by forging and increasing the wall thickness of the pipe end before processing. It can ensure that the connectio -
May 20, 2026What are the classification of casingCasing can be classified into conductor casing, surface casing, intermediate casing, and production casing based on their applications. The conductor casing isolates seawater or
