Import Api Non Magnetic Drill Collar(Nmdc) — Buy in wholesale FOB from Supplier in China

Dongying Lake Petroleum Technology manufactures API specification non-magnetic drill collars from integral non-magnetic alloy steel bar stock. The product is available in two material variants: dedicated non-magnetic stainless steel grades and 4145H modified low-carbon steel with controlled permeability. Manufacturing follows API Spec 7 and Chinese standard SY/T5144. All connections are machined with CNC lathes and can be supplied with phosphate coating, copper plating, or cold-worked thread surface finish per customer requirement. The collar body is produced from solid bar with no welded or fabricated construction.

Non-magnetic drill collars serve a critical function in directional and measurement-while-drilling assemblies by providing stiffness and weight near the bit while minimising magnetic interference with downhole surveying instruments. The permeability specification is paramount, typically requiring values below 1.05 relative permeability for standard grades and below 1.01 for premium grades. 4145H modified material offers cost advantages but requires careful chemistry control to achieve non-magnetic properties. Cold working of thread roots improves fatigue resistance in rotary-shouldered connections subjected to cyclic bending and torque loads. Third-party inspection acceptance is offered by the supplier, though inspection scope and body must be negotiated.

Primary buyers include directional drilling service companies, MWD/LWD tool operators, and drilling contractors running steerable assemblies in magnetic survey-dependent applications. The collars are used in combination with non-magnetic stabilisers and non-magnetic heavy weight drill pipe to maintain a magnetically clean bottom-hole assembly. Connection selection depends on existing drill string configuration and torque requirements. Buyers should confirm material certification, permeability test reports, and connection make-up torque specifications with Dongying Lake Petroleum Technology before finalising technical requirements.

Dongying Lake Petroleum Technology Co., Ltd. is located on Huanhe Road, Dongying, Shandong Province, 257000, China. The supplier holds imported supplier tier and harbor trust tier designations. Response rate shows 0.00 percent with zero average response hours, indicating no response history is available. The company positions itself as a top supplier of API non-magnetic drill collars and emphasises reliable quality with good service. No establishment date, workforce size, or facility details are provided in the source data.

The supplier's stated manufacturing capability includes CNC lathe machining of double-shouldered and special thread forms, with optional surface treatments including phosphate, copper plating, and cold working. Third-party inspection acceptance is mentioned as available. No API certificate number, quality management system certification, named clients, or export market references appear in the available profile. Buyers should independently verify manufacturing credentials, inspect quality control documentation, and confirm actual production capacity before committing to volume orders.