News & Technical Articles – Oilfield Steel Insights | ShunFu Metal

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News & Technical Articles – Oilfield Steel Insights | ShunFu Metal2026-06-10T06:55:44+00:00

Four-Quadrant Hardness Testing for Oilfield Steel Bars — Uniform Quality Control by SHUNFU METAL

By Harris — Technical Staff, SHUNFU METAL Why Uniformity Matters More Than Peak Strength For API 7 drilling tools and API 6A Christmas tree components, material requirements leave no room for compromise. Drill collars machined from

Large-Diameter Borehole Drill Collar Fracture: Root Cause Analysis, BSR Degradation, and BHA Safety Management

Field-case analysis of Ø228.6 mm drill collar fatigue fracture in a Ø406.4 mm large-diameter borehole, Sichuan-Chongqing: BSR degradation to 2.18 from OD wear, centralizer stress concentration, >30g lateral vibration, exponential equivalent-stress rise above Ø444.5 mm, and quantified BHA safety management measures with minimum acceptable collar OD and stress amplitude thresholds.

Casing Stage Cementing Collar Thread Connection Pullover Failure Analysis

Harris Lee examines a real-world stage cementing collar pullover incident in a Φ339.72 mm P110 BC casing string — where thread parameters and material met API Spec 5CT requirements but deformed coupling geometry caused improper make-up position despite reaching maximum torque — and what it means for casing handling, protection ring inspection, and torque-vs-position make-up control practices.

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