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China, Chinese Drill Collar with Borehole Stabilization Design1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Drilling ToolsDrill CollarDrill CollarBorehole Stabilization
Goldenman Petroleum Equipment Co., Limited
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Product Description Drill Collar (Standard / Spiral / Non-Magnetic) Product DescriptionA drill collar is a thick-walled, heavy steel tube used in the bottom hole assembly (BHA) of drilling operations. Its primary purposes are:To add weight on bit (WOB) to help the drill bit penetrate rock formations. To stiffen the bottom portion of the drill string so that the string does not buckle under compressive loads, improving directional control and reducing vibration. Drill collars may be slick (smooth OD), spiral grooved (spirals cut onto OD to reduce drag and help fluid circulation), or non-magnetic (for use with measurement tools in magnetic-sensitive operations).Product ParametersParameterCommon / Available ValuesOuter Diameter Range (OD)Roughly 3 1/8″ (≈ 79 mm) up to 11″ (≈ 279 mm) or more depending on design. LengthCommon lengths are ~30 ft, ~31 ft; sometimes longer (e.g. 43 ft) depending on need. Inner Diameter (ID)Varies based on wall thickness; examples include IDs around 1?″ to ~3″ depending on collar OD. Weight / Linear WeightDepends heavily on OD / ID: e.g. collars in certain OD/ID sizes weigh from ~22 lb/ft upward. Material / Steel GradeTypically alloy steel (e.g., AISI 4145H modified), sometimes non-magnetic steel alloy; heat treated. Connection Thread TypesAPI threads such as NC (National), REG, FH, IF etc., matching drill string requirements. StandardsAPI Spec 7-1, API 5DP in relevant parts; manufacturing and QC per API / industry best practices. Product AdvantagesHigh WOB with Rigidity: Heavy collars maximize weight on bit while resisting buckling, maintaining straight, stable operation.Spiral / Non-Magnetic Options for Special Applications: Spiral grooves reduce friction against the borehole wall, improving circulation and minimizing differential sticking. Non-magnetic collars allow use of MWD/LWD tools without interference. Durability in Harsh Conditions: Heat treatment, thick walls, hardened connections ensure resistance to wear, fatigue, and compression stress.Interchangeable and Flexible: Multiple connection types and thread forms; various lengths and diameters to suit different rigs, hole sizes, and well profiles.Company StrengthsDeep experience in manufacturing drill collars meeting API Spec 7-1, with capabilities for non-magnetic materials, spiral variants, and customized thread/connections.In-house forging, machining and heat treatment to ensure mechanical property compliance (yield strength, tensile strength, elongation, impact toughness).Robust QC: Non‐destructive testing, material traceability, metallurgical inspection to guarantee reliability downhole.Broad stock / fast lead times: available in standard sizes, plus custom orders; strong export capacity.After-sales support: thread protectors, hardbanding, elevator/slip recess machining, advice on collar selection for your BHA. ActionContact us today for your high-performance drill collars - specify OD, ID, length, thread type, and whether you need spiral or non-magnetic variants. We deliver collars built to API 7-1 standards, with full test reports and fast shipment.
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