Common oil drill pipe sizes are from 2 7/8 “to 5” od, steel grade E75, X95, G105, S135
API classifieds drillpipe steel into five grades: D, E, 95(X), 105(G), and 135(S).
API 5DP standards are divided into three types: R1:6.10~7.01 m R2:8.84~9.75 m R3:12.19~13.72 m
9.33kg/m-35.8kg/m
Seamless steel pipe for drilling pipe is used in the oil industry for seamless steel pipe
drill pipe is a steel pipe with a threaded end that is used to connect the rig’s surface equipment to the drilling and grinding equipment or bottom hole unit located at the bottom of the drill.
R1:6.10 ~ 7.01 m; R2:8.84 ~ 9.75 m; R3:12.19 ~ 13.72 m
For assemblies on the drill string, the weight per unit length of the weighted drill string is moderate. The drill pipe is a heavy wall body with an extended joint.
The property of the weighted drill pipe is that it can withstand pressure like a drill collar. A unique feature of the weighted drill pipe is the wear belt in the middle of the drill pipe. The wear belt acts as a stabilizer to increase the stiffness of the weighted drill pipe in the drill string and reduce well deviation
The drill collar is attached to the drill pipe for overall weight to prevent deviation. The inner diameter of the drill collar is smaller than that of the drill pipe and the weight is larger than that of the drill pipe
Drill collars are designed to facilitate tripping operation. Hanger groove and slip groove can be machined on the outer surface of the inner thread of drill collars.
Drill collar dimensions in 3 1/8 3 1/2 4 1/8 4 3/4 5 6 6 1/4 6 1/4 6 1/2 6 6 3/4 7 7 7 1/4 7 3/4
Non-magnetic drill collar is made of low carbon high chromium manganese alloy steel, which is refined after strict chemical composition ratio and forged to achieve its mechanical properties. It has good low permeability, high strength mechanical properties, excellent intergranular corrosion cracking resistance and excellent wear resistance
Drill pipe is used to transmit rotary torque and drilling fluid from the surface to the drill bit. It forms the main body of the drill string, providing strength and flexibility needed to reach target formations while enabling efficient circulation of drilling mud.
Drill collars are thick-walled, heavy steel components placed near the drill bit to apply weight on bit (WOB) and maintain directional control. Unlike the lighter and more flexible drill pipe, drill collars provide rigidity and prevent buckling during drilling.
Drill collars typically range from 3 1/8″ to 11″ in outer diameter (OD), with thread connections such as NC38, NC50, 4-1/2 IF, and 6-5/8 REG. Custom thread types can also be machined to meet specific project needs.
Non-magnetic drill collars are essential for directional drilling because they allow MWD/LWD tools to operate without magnetic interference. This ensures accurate measurement of azimuth, inclination, and toolface orientation for precise wellbore navigation.
To ensure quality, choose suppliers with API 5DP/7-1 certification, in-house heat treatment, friction welding, and ultrasonic testing capabilities. Request full documentation including material mill certificates and third-party inspection reports for traceability.
Non-magnetic drill collars eliminate magnetic interference around downhole survey tools, which is critical in directional or horizontal wells. They ensure accurate real-time data from MWD/LWD systems and help maintain trajectory control.
Drill collar stiffness affects how the BHA responds to formation changes. Higher stiffness helps maintain a straighter well path, reducing unplanned deviation and doglegs. It also supports consistent weight on bit and smoother toolface orientation.
A proper BHA design for horizontal wells balances weight, stiffness, and flexibility. It typically includes non-magnetic drill collars near MWD/LWD tools, stabilizers for directional control, and heavy-weight drill pipe to ensure smooth trajectory and toolface stability.
High-quality drill pipes reduce the risk of connection failure, fatigue cracking, or joint leakage. This leads to fewer trips, less non-productive time (NPT), and more consistent drilling performance—directly improving overall project efficiency and safety.
Non-magnetic drill tools are downhole components made from specialized low-magnetic or non-magnetic alloys, such as non-magnetic stainless steel or monel. They are used in directional and measurement-intensive drilling operations to prevent magnetic interference with sensitive instruments like MWD (Measurement While Drilling) or LWD (Logging While Drilling) systems.
For urgent orders, we offer a lead time of 7–15 days depending on product specifications and quantity. We maintain ready-to-ship inventory of standard drill pipe sizes and connections to support fast delivery worldwide.
MWD and LWD tools rely on accurate magnetic and directional readings. If nearby components are magnetized, they can distort the toolface or azimuth data, leading to miscalculations. Non-magnetic materials eliminate this risk by allowing precise readings of the Earth’s magnetic field, which is critical for directional drilling accuracy and safety.
Common non-magnetic products include non-magnetic drill collars, heavy weight drill pipe (HWDP), stabilizers, crossover subs, and MWD/LWD housing components. These tools are strategically placed within the bottom hole assembly (BHA) to ensure accurate directional measurements and consistent wellbore trajectory.
Yes, non-magnetic stabilizers can be fully customized to meet the demands of specific formations or directional drilling programs. Customization options include blade design (spiral or straight), blade hardfacing, overall length, body OD, and connection type to ensure proper fit within the BHA and optimal performance downhole.
Each non-magnetic tool undergoes magnetic permeability testing using high-sensitivity Gauss meters or fluxgate magnetometers. Measurements are taken along the tool body to ensure residual magnetic field levels fall within industry-accepted thresholds, typically below 0.5 milligauss. Certified test reports are provided for traceability and compliance.
Absolutely. Our non-magnetic tools are designed for seamless integration into various directional drilling BHAs. They are fully compatible with MWD/LWD systems, rotary steerable assemblies, and high-precision surveying tools, making them ideal for horizontal, extended-reach, and high-deviation wells.
When properly stored, non-magnetic drilling tools have a long shelf life—often several years. They should be kept in a clean, dry, and temperature-controlled environment to prevent corrosion or accidental magnetization. Protective covers should remain in place, and tools should be periodically inspected for any changes in surface condition or magnetic properties.
Drilling stabilizers typically fall into three categories:
Near-bit stabilizers – positioned just above the bit to control bit tilt and initial trajectory.
String stabilizers – placed higher in the drill string to maintain hole direction over long intervals.
Reamers or integral blade stabilizers – used for hole enlargement and directional support in complex well profiles.
Blade configurations can be straight, spiral, or tapered depending on the application.
A near-bit stabilizer is located immediately above the drill bit and directly influences bit orientation and kickoff behavior, making it essential in directional wells.
A string stabilizer is placed further up the drill string to control hole angle over longer intervals and reduce lateral vibration, especially in deviated or horizontal wells.
Choosing the right stabilizer depends on hole diameter, BHA configuration, formation type, and drilling objectives.
Blade OD should be slightly less than the hole size to minimize drag while maintaining centralization.
Blade design: Spiral blades are ideal for directional control and cuttings evacuation, while straight blades offer higher wall contact and better stabilization in vertical wells.
Material hardness and hardfacing should also match the formation abrasiveness.
Our stabilizers are machined from high-strength alloy steel or non-magnetic stainless steel, depending on the application. All stabilizers undergo precision machining, blade profiling, and hardfacing with tungsten carbide inserts or HF1000 alloy. Each unit is heat-treated to improve mechanical properties such as wear resistance, impact toughness, and fatigue strength, ensuring consistent performance under harsh drilling conditions.
We implement strict QC protocols, including ultrasonic inspection, hardness testing, and dimensional control throughout the manufacturing process. Each stabilizer is tested for blade profile accuracy, material integrity, and non-magnetic properties (if applicable). For high-deviation wells, we offer detailed engineering support to optimize blade geometry and placement based on BHA modeling and trajectory plans.
