Import Api 7-1 Non Magnetic Drill Collar Nmdc — Buy in wholesale FOB from Supplier in China

The API 7-1 Non Magnetic Drill Collar NMDC is a non-magnetic stainless steel drill collar designed to isolate measurement-while-drilling (MWD) and logging-while-drilling (LWD) directional sensors from magnetic interference generated by standard steel drill string components. Dongying Lake Petroleum Technology Co., Ltd supplies these in sizes from 3-1/8 to 11 inches outer diameter, with the non-magnetic variant specifically engineered to maintain low magnetic permeability throughout its service life. The collar provides weight on bit and rigidity to the bottom-hole assembly while preserving the accuracy of azimuth and inclination measurements from magnetometer-based survey tools. Material selection typically favours low-carbon chromium-nickel-molybdenum austenitic stainless steels with controlled nitrogen content to resistIj resist sensitisation and stress corrosion.

The NMDC differs from standard slick and spiral drill collars in its metallurgical specification: magnetic permeability must remain below 1.05 or 1.1 relative units (supplier-specific) to prevent distortion of the Earth's magnetic field at the sensor package. Bore dimensions, wall thickness, and connection specifications follow API 7-1 dimensional tables, with NC38, NC50, 6-5/8 API regular, or other rotary-shouldered connections machined to class tolerances. Spiral groove configurations are not standard on NMDCs due to stress concentration concerns in the non-magnetic alloy, though some manufacturers offer proprietary designs. The material is significantly more expensive than standard 4145H alloy steel, and procurement decisions must balance magnetic performance against mechanical property requirements for the specific well environment.

Buyers of non-magnetic drill collars are typically directional drilling service companies, MWD/LWD tool providers, and operators running steerable assemblies in applications where magnetic survey accuracy is critical. The NMDC is positioned immediately above the motor or rotary steerable system, with sufficient length to place the magnetic sensors in a magnetically quiet zone. Sourcing from Dongying Lake Petroleum Technology requires confirmation of the exact size, connection, and magnetic permeability certification, as the supplier indicates custom manufacture at customer request. Standard packaging is wooden export crating; given the 0.00 percent response rate on this channel, direct supplier contact is advisable to confirm current manufacturing capacity and inspection protocols.

Dongying Lake Petroleum Technology Co., Ltd operates from Huanghe Road, Dongying 257000, China, within the Shengli oilfield industrial corridor. The supplier profile indicates imported-tier classification with harbour trust verification, though the response rate is recorded at zero percent with no average response time data. This absence of engagement history through the platform channel necessitates direct outreach for quotation and technical discussion. The company lists drill collars in slick, spiral and non-magnetic variants, suggesting a product range focused on bottom-hole assembly components rather than full-string capability.

No information is provided regarding factory ownership, ISO 9001 or API Q1 quality system certification, annual production capacity, or end-user reference list. The supplier's willingness to supply non-standard sizes at customer request indicates either manufacturing flexibility or trading relationships with multiple production sources. Buyers should conduct supplier qualification including business licence verification, factory audit where possible, and confirmation of API monogram licence status for drill collar manufacture. The absence of verified client testimonials or case studies in the source data means due diligence falls entirely on the prospective importer.