API 7-1 Nmdc Non-Magnetic Drill Collar

Description

API 7-1 Non-Magnetic Drill Collar for MWD, LWD, Directional Drilling and Oilfield BHA Applications

SGPE manufactures NMDC Non-Magnetic Drill Collars for oilfield MWD, LWD, directional drilling, horizontal well drilling and bottom hole assembly applications. We produce these non-mag drill collars according to customer drawings, project specifications and applicable API 7-1 requirements.

Each collar starts with selected non-magnetic steel bars. Through controlled chemical composition, rotary hammer forging, precision machining and final inspection, SGPE helps the finished tool deliver low magnetic interference, stable weight on bit and dependable performance in oil and gas drilling operations.

Accurate downhole measurement plays an important role in modern petroleum drilling. Magnetic steel can affect MWD, LWD and directional survey tools during azimuth, inclination and toolface measurements. A Non-Magnetic Drill Collar creates a low-interference zone around these instruments, helping drilling teams improve survey accuracy, control the well path and build a more reliable oilfield BHA.

SGPE offers three main body designs: Slick Non-Mag Drill Collar, Spiral Non-Mag Drill Collar and Flex Non-Mag Drill Collar. The slick design suits standard directional drilling and common MWD/LWD assemblies. The spiral design improves drilling fluid flow around the collar and works well in horizontal or high-angle wells. The flex design offers better adaptability for high build rate sections, short radius turns and severe doglegs.

For a faster quotation, please send your connection type, OD, ID, length, quantity and drilling application. SGPE will review your technical requirements and recommend a suitable Non-Mag Drill Collar for your oilfield drilling program.

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Product Overview

A Non-Magnetic Drill Collar, also called NMDC, Non-Mag Drill Collar, MWD Drill Collar, LWD Drill Collar, Non-Magnetic Collar or Non-Magnetic BHA Collar, is a key drilling tool used in petroleum bottom hole assemblies.

The collar adds weight to the drill string and helps transfer weight on bit during drilling. More importantly, it reduces magnetic interference around downhole measurement tools. For this reason, drilling contractors, directional drilling service companies, MWD/LWD service providers and oilfield operators use NMDC products in measurement-based drilling programs.

SGPE supplies Non-Magnetic Drill Collars for rotary steerable systems, directional drilling BHAs, horizontal well assemblies and complex well trajectory control. Before shipment, our team checks size, connection, thread quality, marking and documentation, helping customers manage field use, inventory and product traceability with more confidence.

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Key Features of SGPE Non-Magnetic Drill Collars

Low Magnetic Interference for Downhole Measurement Tools

SGPE Non-Mag Drill Collars help create a stable measurement environment for MWD tools, LWD tools and directional survey instruments. This helps drilling teams obtain more reliable downhole data in directional wells, horizontal wells, high-angle wells and complex drilling programs.

Reliable Performance in Oilfield BHA

Oilfield drilling tools must handle torque, axial load, bending stress, vibration and downhole pressure. SGPE controls material selection, forging, machining and inspection to support reliable collar performance in demanding petroleum well programs.

Precision Machining and Accurate Dimensions

SGPE machines the OD, ID, connection threads and surface areas with strict dimensional control. Accurate machining supports better fit-up, stable assembly performance and reliable connection quality at the rig site.

Suitable for MWD and LWD Tool Housing

A Non-Magnetic Drill Collar can serve as a housing for MWD and LWD equipment. It protects downhole tools, supports drilling loads and helps maintain a low-magnetic environment around sensitive measurement instruments.

Multiple Designs for Different Well Profiles

SGPE offers Slick, Spiral and Flex Non-Mag Drill Collars. Customers can choose the proper design according to drilling fluid flow, wellbore profile, build rate, dogleg severity and BHA layout.

Custom Manufacturing Support

SGPE supports custom NMDC production for oilfield projects. Customers can specify connection style, OD, ID, length, body type, recessed mill flats, marking, inspection documents and export packing requirements.

Inspection Certificate and Traceability

SGPE records key inspection data in the product certificate. Product markings may include serial number, OD, ID, connection type, connection size and other required information according to customer specifications and order documents.

Magnetic permeability, mechanical properties, inspection requirements and documentation can also be confirmed according to customer specifications before production.

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Types of SGPE Non-Magnetic Drill Collars

Slick Non-Mag Drill Collar

A Slick Non-Mag Drill Collar has a smooth outside surface. This simple and reliable body design provides stable weight on bit and helps maintain a low-magnetic-interference environment for downhole directional tools.

Oilfield teams commonly use Slick NMDCs in straight hole drilling, standard directional drilling, MWD assemblies and LWD bottom hole assemblies. The smooth body also makes this design suitable for common drilling assemblies where stable performance, easy handling and reliable tool housing all matter.

SGPE manufactures Slick Non-Mag Drill Collars with multiple NC and REG connection options to meet different oilfield BHA requirements. This design works well for customers who need a standard Non-Mag Drill Collar for MWD or LWD tool housing, directional drilling programs and general oil and gas well drilling applications.

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Spiral Non-Mag Drill Collar

A Spiral Non-Mag Drill Collar has spiral grooves on the outside surface. These grooves increase the drilling fluid flow area around the collar and help drilling fluid move more smoothly through the annular space. This design can improve wellbore cleaning and support better cuttings removal in suitable drilling conditions.

Drilling contractors often choose Spiral NMDCs for horizontal wells, high-angle wells and complex directional drilling programs that require better mud flow around the BHA. The spiral body design can also help reduce differential sticking risk when the well condition and drilling program require improved fluid circulation.

SGPE manufactures Spiral Non-Mag Drill Collars with non-magnetic steel to maintain a low-interference environment for MWD and LWD tools. This makes the product suitable for complex directional drilling assemblies where drilling fluid performance, measurement reliability and BHA stability all matter.

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Flex Non-Mag Drill Collar

A Flex Non-Mag Drill Collar has a thinner and more flexible body than a standard drill collar. This design helps the tool pass through short radius turns, high build angle sections and severe doglegs in directional and horizontal oil and gas wells.

SGPE manufactures Flex NMDCs for drilling programs that require better flexibility and reliable MWD protection. The non-magnetic steel body helps reduce magnetic interference around MWD equipment, while the flexible design supports smoother BHA movement in challenging well profiles.

Compared with standard drill collars, Flex Non-Mag Drill Collars offer better adaptability in short radius drilling applications. They also help drilling teams pass through high build angle sections and severe dogleg well paths more smoothly. In directional and horizontal well BHA designs, this type of collar can provide both flexibility and a suitable housing environment for MWD equipment.

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Oilfield Applications

SGPE Non-Magnetic Drill Collars support petroleum drilling operations and bottom hole assembly design in oil and gas wells. They help drilling contractors, oilfield service companies, MWD/LWD service providers and operators improve downhole measurement reliability, drilling stability and well path control.

In MWD and LWD drilling assemblies, SGPE NMDC products create a low-magnetic-interference environment for measurement-while-drilling tools, logging-while-drilling tools and directional survey instruments. This makes them suitable for directional drilling BHA, horizontal well drilling BHA, rotary steerable system applications and complex well trajectory control.

SGPE Non-Mag Drill Collars also work well in high-angle oil and gas wells, straight hole drilling programs, high build rate directional drilling, short radius drilling and severe dogleg well sections. For oilfield drilling tool replacement or custom BHA supply, SGPE can provide suitable Slick, Spiral or Flex Non-Mag Drill Collars according to the customer’s drilling program and technical requirements.

With the right NMDC, drilling teams can reduce magnetic interference near survey tools, improve measurement accuracy and maintain better wellbore trajectory control in demanding oil and gas wells.

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Who Uses SGPE NMDC Non-Magnetic Drill Collars?

SGPE supplies Non-Magnetic Drill Collars to oilfield companies that need reliable drilling tools for directional drilling, horizontal drilling and measurement-based drilling programs. Our NMDC products serve drilling contractors, directional drilling service companies, MWD service providers and LWD service providers that require stable tool performance and accurate downhole measurement.

SGPE also works with oilfield tool distributors, petroleum equipment suppliers and oil and gas operators that need standard or customized Non-Mag Drill Collars for different drilling projects. BHA design teams and drilling engineering teams can also use SGPE NMDC products to support bottom hole assembly design, wellbore trajectory control and complex oilfield drilling applications.

Whether your project requires a standard NMDC or a custom Non-Mag Drill Collar, SGPE can help you confirm the correct size, connection and body design before production.

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Why Choose SGPE as Your Non-Magnetic Drill Collar Manufacturer?

Selected Non-Magnetic Steel Bars

SGPE selects non-magnetic steel bars suitable for oilfield drilling tool manufacturing. Our production team controls material selection, forging and machining steps to help the finished collar maintain low magnetic interference and stable field performance.

Rotary Hammer Forging and Precision Machining

SGPE combines rotary hammer forging with precision machining. This process helps improve material consistency, dimensional accuracy, connection quality and surface finish.

Wide Size and Connection Range

SGPE offers multiple connection styles and sizes, including NC23, NC26, NC31, NC35, NC38, NC44, NC46, NC50, NC56, NC61, NC70 and REG connections. Our OD range covers 79.4 mm to 279.4 mm, which suits many oilfield BHA requirements.

Custom Production for Oilfield Projects

SGPE can manufacture Non-Mag Drill Collars according to customer drawings, specifications and drilling program requirements. Customers can confirm connection type, OD, ID, length, body style, surface design, marking and inspection requirements before production.

Inspection Certificate with Each Drill Collar

SGPE provides an inspection certificate with each Non-Magnetic Drill Collar. The certificate records key inspection data and helps customers check dimensions, connection details, marking and traceability.

Clear Product Marking

SGPE can mark important product information on the recessed mill flats according to order requirements. These markings may include serial number, OD, ID, connection type, connection size and other customer-required identification details. When applicable, API-related markings follow the relevant order documents and qualification requirements.

Support for International RFQs

SGPE understands the needs of international oilfield buyers. Our team can review technical requirements, confirm suitable specifications and support quotation requests from drilling contractors, service companies, distributors and petroleum equipment suppliers.

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Available Custom Options

SGPE supports customized Non-Magnetic Drill Collar production according to different oilfield project requirements. Customers can specify the connection style, connection size, outside diameter, inside diameter and length according to their drill string design, wellbore condition and BHA requirements.

SGPE can manufacture Slick, Spiral or Flex Non-Mag Drill Collars based on the customer’s drilling application. We can also process recessed mill flats, surface markings and serial number markings to support product identification, field management and traceability.

If the project requires specific drawings, technical specifications, export packing requirements, special documentation or additional inspection items, customers can send these details to SGPE before production. Our team will review the requirements and confirm the suitable manufacturing plan.

For projects with special mechanical properties, magnetic permeability requirements or extra quality documents, please send your specification to SGPE for technical review before production.

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Technical Specifications

Please check the standard size range below. If your project needs a custom OD, ID, length or connection type, send your drawing or specification to SGPE for confirmation.

Small and Medium OD Non-Magnetic Drill Collar Sizes

Large OD Non-Magnetic Drill Collar Sizes

Other sizes, connection types and customized specifications are available upon request.

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Quality Control

SGPE follows a strict inspection process for every Non-Magnetic Drill Collar. Before shipment, our inspection team checks the outside diameter, inside diameter and overall length to confirm that each drill collar meets the required dimensional specifications. The team also verifies the connection type, connection size and thread quality to help ensure reliable field assembly.

During inspection, SGPE reviews the surface condition, product marking and serial number information. We also check the recessed mill flats marking to make sure the OD, ID, connection type, connection size and other required markings remain clear and easy to identify. In addition, our team reviews the inspection certificate and final documentation before the product enters the packing process.

SGPE only releases qualified drill collars for packing and delivery. This inspection process helps customers reduce receiving risks, improve product traceability and obtain reliable drilling tools for petroleum well programs.

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How to Select the Right Non-Magnetic Drill Collar

To select the right NMDC for an oilfield BHA, customers should first confirm the drilling program, well profile, downhole tool size and connection requirements. These details help ensure that the Non-Magnetic Drill Collar matches the drill string, supports the MWD or LWD tools and performs reliably in the planned well conditions.

The connection style and size should match the drill string, tool joint and bottom hole assembly design. Common options include NC38, NC44, NC46, NC50, NC56, NC61, NC70 and REG connections. The outside diameter and inside diameter should also match the wellbore size, MWD/LWD tool dimensions and drilling program requirements.

Length is another important factor. Common NMDC lengths include 9150 mm and 9450 mm, while SGPE can also review custom length requirements according to customer specifications. Customers should also choose the proper body design based on the drilling application.

Slick Non-Mag Drill Collars suit standard assemblies, Spiral Non-Mag Drill Collars improve drilling fluid flow area, and Flex Non-Mag Drill Collars help with short radius turns, high build rate sections and severe doglegs.

The selected collar should match the actual oilfield application, such as straight hole drilling, directional drilling, horizontal drilling, high-angle drilling, high build rate drilling or complex BHA operation. Bending ratio also matters in directional wells, horizontal wells and severe dogleg sections, so SGPE can help customers review a suitable specification based on the drilling profile.

Before production, customers can confirm inspection certificate requirements, serial number marking, connection marking and other identification needs. For better selection, please send SGPE your wellbore size, connection requirement, MWD tool size, BHA design, drilling application and quantity.

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RFQ Information About API 7-1 NMDC Non-Magnetic Drill Collar

To receive a faster and more accurate quotation, please provide the product type, connection style, OD, ID, length and quantity. Your drilling application, MWD or LWD tool size, required inspection documents, marking requirements and packing requirements will also help SGPE prepare a more suitable offer.

If you have a customer drawing, technical specification or special project requirement, please send it together with your inquiry. SGPE will review the details and recommend a suitable Slick, Spiral or Flex Non-Mag Drill Collar for your oilfield drilling project.

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Related Oilfield Drilling Tools

Explore more SGPE oilfield drilling tools for complete BHA and drill string solutions, including Drill Collar, Spiral Drill Collar, Heavy Weight Drill Pipe, Integral Blade Stabilizer, Replaceable Sleeve Stabilizer, MWD Drilling Tools and Oilfield BHA Components.

These related products help buyers compare different drilling assembly options and help search engines understand SGPE’s oilfield drilling tool product system.

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FAQ About API 7-1 NMDC Non-Magnetic Drill Collar

1. What is an API 7-1 NMDC Non-Magnetic Drill Collar?

An NMDC Non-Magnetic Drill Collar is a non-magnetic oilfield drilling tool used in bottom hole assemblies. NMDC stands for Non-Magnetic Drill Collar. This tool adds weight to the drill string, supports weight on bit and helps reduce magnetic interference around MWD, LWD and directional survey instruments.

Drilling teams use this type of collar in directional wells, horizontal wells, high-angle wells and complex BHA designs. It helps the crew obtain more reliable downhole survey data and control the well path more accurately. SGPE can manufacture NMDC products according to customer specifications and applicable API 7-1 requirements.

2. Why do oilfield drilling operations need Non-Mag Drill Collars?

Directional drilling depends on accurate downhole measurements. Magnetic steel can disturb azimuth, inclination and toolface readings. A Non-Mag Drill Collar helps create a low-magnetic area around the tools, so MWD and LWD systems can work more reliably.

Drilling contractors often use NMDCs in MWD drilling assemblies, LWD assemblies, rotary steerable systems and horizontal well BHA designs. The right collar can help reduce survey errors and support smoother drilling performance.

3. What is the difference between a Non-Magnetic Drill Collar and a standard drill collar?

A standard drill collar mainly adds weight and stiffness to the drill string. A Non-Magnetic Drill Collar also adds weight, but it provides another key benefit: it helps protect magnetic-sensitive downhole tools from interference.

This difference makes NMDCs important in oil and gas wells that use MWD tools, LWD tools or directional survey equipment. In simple terms, a standard drill collar supports drilling mechanics, while a non-mag collar supports both drilling mechanics and measurement accuracy.

4. What are Slick, Spiral and Flex Non-Mag Drill Collars?

SGPE supplies three common designs for oilfield drilling programs. A Slick Non-Mag Drill Collar has a smooth outside surface and suits standard MWD/LWD BHA, straight hole drilling and common directional drilling jobs.

A Spiral Non-Mag Drill Collar has spiral grooves on the body. These grooves increase drilling fluid flow area and help improve wellbore cleaning, especially in horizontal and high-angle wells. A Flex Non-Mag Drill Collar has a thinner, more flexible body, so it suits short radius wells, high build rate sections and severe dogleg well paths.

5. How do I choose the right Non-Magnetic Drill Collar for my oilfield BHA?

You should first confirm the wellbore size, drill string design, MWD or LWD tool size, connection type and drilling program. After that, you can select the OD, ID, length, body design and bending ratio.

For example, a standard directional drilling job may use a Slick NMDC. A horizontal well with mud flow concerns may require a Spiral design. A short radius or high build rate well may need a Flex collar. SGPE can help review your BHA design and recommend a suitable option.

6. Can a Non-Magnetic Drill Collar house MWD and LWD tools?

Yes. A Non-Magnetic Drill Collar can serve as a housing for MWD tools, LWD tools and directional survey equipment. The collar protects the tools inside the bottom hole assembly and helps maintain a low-interference environment around them.

This makes the collar useful in directional drilling, horizontal drilling, high-angle wells and complex trajectory control. When the ID, connection and body design match the downhole tool layout, the collar can support both measurement reliability and drill string performance.

7. What connection types and sizes can SGPE supply?

SGPE can supply common oilfield connection styles, including NC23, NC26, NC31, NC35, NC38, NC44, NC46, NC50, NC56, NC61, NC70 and REG connections. These options cover many drill string and BHA requirements.

Customers can choose the connection according to the drilling program, tool joint requirement and field compatibility. If your project needs a specific thread type, connection size or customer drawing, please send the details to SGPE for technical confirmation.

8. Can SGPE manufacture customized Non-Magnetic Drill Collars?

Yes. SGPE can manufacture customized Non-Magnetic Drill Collars for MWD, LWD, directional drilling and horizontal well applications. Customers can specify OD, ID, length, connection type, body style, marking, inspection documents and packing requirements.

SGPE can also review customer drawings or technical specifications before production. This helps buyers confirm key details early and reduce communication problems during the ordering process.

9. What information should I provide for a Non-Magnetic Drill Collar quotation?

To receive a faster and more accurate quotation, please provide the product type, connection style, OD, ID, length, quantity, MWD/LWD tool size, drilling application, inspection documents, marking requirements and packing requirements.

If you have a drawing or technical specification, please send it with your inquiry. These details help SGPE confirm the correct specification and prepare a more useful offer for your oilfield drilling project.

10. What quality control does SGPE perform before shipment?

SGPE checks each Non-Magnetic Drill Collar before shipment. Our inspection team reviews OD, ID, length, connection size, thread quality, surface condition, recessed mill flats, serial number marking and final documents.

SGPE records inspection data in the product certificate. This helps customers verify dimensions, connection details and traceability information before field use. Clear inspection records also help drilling contractors, service companies and distributors simplify project documentation.

11. What markings does SGPE place on Non-Mag Drill Collars?

SGPE marks key product information on the recessed mill flats according to order requirements. These markings may include serial number, OD, ID, connection type, connection size and other required identification details.

Clear marking helps oilfield crews identify the collar during storage, transportation, rig preparation and field operation. It also helps customers manage traceability when they use multiple NMDCs in different MWD, LWD or directional drilling assemblies.

12. Why choose SGPE as your Non-Magnetic Drill Collar manufacturer?

SGPE supports oilfield customers with NMDC Non-Magnetic Drill Collars for MWD, LWD, directional drilling, horizontal wells and bottom hole assembly applications. We combine selected non-magnetic steel, rotary hammer forging, precision machining, inspection control and custom manufacturing support.

Customers choose SGPE because we offer Slick, Spiral and Flex designs, multiple NC and REG connections, wide size coverage and practical RFQ support. Our team can help buyers confirm technical details before production, which makes purchasing easier for drilling contractors, oilfield service companies, tool distributors and petroleum equipment suppliers.

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Final Inquiry Call-to-Action

Need a reliable NMDC Non-Magnetic Drill Collar manufacturer for MWD, LWD, directional drilling, horizontal wells or oilfield BHA applications?

Contact SGPE today for a customized quotation. Send us your connection type, OD, ID, length, quantity and drilling application. Our team will help you choose the right Slick, Spiral or Flex Non-Mag Drill Collar for your oilfield drilling program.

E-Mail:
info@sgpe.com