N1310 Non Magnetic Drill Collar Specifications and Selection Guide

When I select an N1310 non magnetic drill collar, I first confirm the required non-magnetic performance, outside diameter, inside diameter, length, connection, material condition, and inspection documents. “N1310” identifies a non-magnetic drill collar material or product grade used to reduce magnetic interference around measurement-while-drilling and logging tools, but it does not by itself define every dimensional or connection requirement. The correct purchase specification must therefore combine the N1310 designation with the drilling assembly design, tool clearance, connection standard, operating environment, and documentation requirements. At Longway, I use these details as the starting point for a technically appropriate quotation rather than treating the grade name as a complete specification.

You can find more information on our web, so please take a look.

Who This Guide Is For

This guide is intended for drilling contractors, directional drilling companies, oilfield equipment distributors, MWD and LWD service providers, procurement teams, and engineering departments sourcing N1310 non magnetic drill collars. It is also useful for buyers comparing custom and standard configurations from steel pipe and drilling-tool suppliers. The objective is to help you prepare a complete inquiry and avoid selecting a collar based only on nominal size or price. Final suitability should always be verified against the drilling program and the tool manufacturer’s requirements.

What an N1310 Non Magnetic Drill Collar Does

A non-magnetic drill collar is a heavy-wall tubular component installed near directional or measurement tools to provide drilling weight while limiting magnetic influence on downhole sensors. Reducing magnetic interference can help create a more suitable environment for magnetic directional measurements, although the actual result depends on the complete bottom-hole assembly, surrounding steel components, formation conditions, and survey system. The collar still has to satisfy mechanical, dimensional, connection, and fatigue requirements in addition to its non-magnetic function. For this reason, I treat magnetic performance and mechanical integrity as two connected but separate selection criteria.

Typical Application Scenarios

N1310 non magnetic drill collars may be considered for directional drilling, MWD or LWD assemblies, wellbore surveying, and drilling configurations where magnetic disturbance must be controlled near sensitive instruments. They can also be used in specialized drilling systems that require a non-magnetic section between conventional steel components. The correct position and length of the non-magnetic section are normally determined by the tool provider and BHA designer. I recommend confirming the required non-magnetic spacing before requesting a final offer.

Key N1310 Specification Categories

The most important specification is not a single number but a group of related parameters. A buyer should define the collar’s material designation, dimensional envelope, connection, mechanical requirements, non-magnetic requirements, inspection scope, and delivery condition. If any item is unknown, state it as “to be confirmed” rather than allowing the supplier to make an unapproved assumption. This approach reduces the risk of receiving a collar that is dimensionally correct but unsuitable for the intended BHA.

Dimensions and Connection Compatibility

Outside diameter affects hole clearance, bending behavior, tool placement, and the available annular flow area. Inside diameter affects bore clearance and may influence pressure losses, tool passage, and internal inspection access. Length should be specified as a required finished length or an acceptable range, with the measurement reference clearly identified. For example, a request should state whether length is measured overall, shoulder-to-shoulder, or between specified reference points.

Connection details require equal attention because a nominal collar size does not guarantee connection compatibility. I ask buyers to provide the mating component drawings or the exact connection designation, including thread form, taper, shoulder arrangement, and make-up requirements when available. A connection may also require dedicated gauging, thread protection, and controlled handling. These details are especially important when the collar is intended to connect directly to proprietary MWD, LWD, or directional drilling equipment.

How to Select the Correct N1310 Collar

Step 1: Define the BHA and Tool Envelope

Begin with the drilling assembly drawing or tool string data sheet. Record the neighboring components, tool outer diameter, internal passage requirements, planned position, and any non-magnetic spacing recommendation. Do not select the collar in isolation because adjacent ferromagnetic components can affect the magnetic environment even when the collar itself is non-magnetic. If the tool supplier provides a minimum collar length or clearance requirement, include that information in the inquiry.

For more information, please visit Longway.

Step 2: Confirm Operating Conditions

Next, identify the expected well depth, temperature, pressure, drilling fluid, vibration exposure, dogleg severity, and trip frequency. These conditions help determine the required mechanical properties, inspection level, surface protection, and fatigue considerations. A collar for a demanding directional assembly may need a different engineering review from one used in a relatively straight, low-deviation interval. Where project data are incomplete, I recommend requesting a supplier review instead of assuming that a standard configuration will be adequate.

Step 3: Set the Technical Acceptance Criteria

Specify the required material designation and ask the supplier to confirm the applicable manufacturing and inspection basis. The acceptance package may include material traceability, heat-treatment records, dimensional inspection, thread inspection, hardness results, and non-destructive examination, depending on the project requirement. Do not request test records that are not relevant to the application, but do not omit records needed for traceability. A clear inspection and documentation list prevents disagreement after production.

Step 4: Compare Quotations on a Like-for-Like Basis

Compare quotations using the same dimensions, connection, quantity, inspection scope, packaging, and delivery terms. A lower initial price may not represent a lower total sourcing cost if it excludes thread protection, special inspection, machining allowances, or export packaging. Ask each supplier to identify exclusions and assumptions in writing. For planning purposes, buyers may request pricing for 1 piece, 3 pieces, or a larger batch, because quantity can affect setup, machining, inspection, and logistics costs.

Important Buyer Decision Points

The first decision is whether the project requires a standard configuration or a customized collar. Standard dimensions may simplify procurement, but customization can be appropriate when the BHA requires a particular length, bore, connection, or tool interface. The second decision is the required inspection level, which should reflect operational risk and customer documentation rules. The third is delivery priority: a technically correct collar is not useful if its production and inspection schedule does not support the rig program.

Buyers should also clarify whether the supplier is responsible for design confirmation or only for manufacturing to an approved drawing. I recommend sending a drawing, specification sheet, or completed inquiry form whenever possible. If the design is still under development, provide the known values and mark open items clearly. This allows the supplier to identify missing information before manufacturing begins.

Common Selection Mistakes

• Using “N1310” as the only specification without defining dimensions or connections.
• Ignoring the effect of nearby magnetic components in the complete BHA.
• Failing to confirm the required non-magnetic performance with the survey-tool provider.
• Comparing prices that include different inspection, machining, or packaging scopes.
• Approving a collar without checking bore clearance and mating connection details.
• Requesting delivery before the drawing, inspection plan, and acceptance criteria are finalized.

How Longway Supports N1310 Sourcing

As a steel pipes manufacturer, supplier, and exporter, Longway can review your N1310 non magnetic drill collar requirements from a specification and sourcing perspective. I can organize the inquiry around dimensions, material designation, connection, inspection, quantity, packaging, and delivery destination. Where the application requires information that is not provided, I recommend confirming it with the BHA designer or downhole tool manufacturer before issuing a final production instruction. This protects both technical suitability and procurement efficiency.

For an accurate quotation, please prepare the required outside diameter, inside diameter, length, connection details, quantity, applicable technical specification, inspection documents, delivery location, and target schedule. If the collar is part of an MWD or LWD assembly, also provide the tool interface requirements and the required non-magnetic section position or length. We can then identify open points, confirm the manufacturing basis, and separate standard requirements from custom requirements. This is more reliable than requesting a quote using only the product name.

Key Takeaways

• N1310 is a material or product designation, not a complete purchase specification.
• The correct selection must cover magnetic requirements, dimensions, connections, mechanical conditions, inspection, and documentation.
• BHA position, adjacent components, tool clearance, and operating conditions should be reviewed together.
• Quantity, inspection scope, packaging, and delivery terms should be compared consistently between suppliers.
• A complete inquiry enables Longway to evaluate the requirement and prepare a more practical quotation.

Conclusion: The Best Next Step for Buyers

The best N1310 non magnetic drill collar is the one that matches the complete BHA, not simply the one carrying the correct grade name. I recommend starting with the tool envelope and drilling conditions, then confirming dimensions, connections, material requirements, inspection, and delivery expectations. When a specification is uncertain, document the uncertainty and request technical confirmation before production. Send your drawing or inquiry data to Longway for a structured review of the required N1310 collar configuration, manufacturing scope, and supply plan.

Are you interested in learning more about N1310 non magnetic drill collar? Contact us today to secure an expert consultation!