API 7-1 Non-Magnetic Drill Collar

Description

Non-magnetic-dril-collars are one downhole tool specially made use of in the directional and horizontal drilling for oil and gas wells. Essentially, their main role is to provide magnetic survey instruments with a clean magnetic environment thereby allowing the wellbore trajectory to be measured and controlled accurately. The non-magnetic drill collars are characterized by low magnetic permeability and they are strong and have good resistance to corrosion.

 Non-Magnetic Drill Collar Functions in Directional Drilling

The main functions of the API 7-1 Non-Magnetic Drill Collar are as follows:

 Magnetic Shielding Function

It ensures that the downhole magnetic directional measurement tools are in an electromagnetically neutral environment, therefore, the magnetic distortions of the drill string do not affect the measuring instruments and the data obtained.

 Providing Weight on Bit

The Non-Magnetic Drill Collar exerts downward force on the drill bit by its own weight.

 Torque Transmission Capability

Non-Magnetic Drill Collar transmits the power of the rotation from the rotary table or downhole motor to the drill bit.

 Rigid Structural Support

It is instrumental in providing sufficient rigidity for the drill string knock-up and thus, wellbore trajectory is better controlled.

Non-Magnetic Drill Collar Material and Manufacturing Process

The raw material of API 7-1 Non-Magnetic Drill Collars is a special type rather than the common AISI 4145H steel. They adopt specially developed non-magnetic alloy steel, non-magnetic nickel alloys, austenitic stainless steel, Monel alloy, etc., and are made by precision forging to give stable performance.

The heat treatment process needs to be very accurate if the magnetic properties are to be uniform. These drill collars made of special materials and by special manufacturing processes, not only have extremely low magnetic permeability, but also have adequate structural strength for harsh downhole ‍‌‍‍‌‍‌‍‍‌environments.

 API 7-1 Non-Magnetic Drill Collar Specifications and Performance Advantages

Our API 7-1 Non-Magnetic Drill Collars offer significant advantages, boasting excellent non-magnetic stability, maintaining extremely low magnetic deviation even after prolonged exposure to high-load mechanical stress.

The inner bore is typically strengthened or treated with a special surface treatment to prevent corrosion from drilling fluids. These drill collars offer broad compatibility, strictly conforming to API 7-1 standards, and can be seamlessly connected to standard drill pipes and tools. Their superior fatigue resistance and corrosion resistance contribute to a long service life and reduced downhole incidents.

FAQ – API 7-1 Non-Magnetic Drill Collar Definition and Application

What are the practical application principles of the API 7-1 Non-Magnetic Drill Collar?

A non-magnetic drill collar is added to the lowest end of the drill string connecting the drill bit. This prevents the magnetic inclinometer placed inside from being affected by the magnetic fields of the ordinary steel drill tools above and below it, allowing it to accurately sense the Earth’s magnetic field and thus obtain accurate well inclination and azimuth data.

In what operating conditions are non-magnetic materials needed?

Oil directional wells or situations where high-precision geomagnetic sensors are used in industries such as aerospace.

What are the advantages of non-magnetic drill collars compared to ordinary materials?

Conventional drill collars contaminate the geomagnetic field signal, while non-magnetic drill collars protect the signal. The non-magnetic material creates a clean physical environment for magnetic measurement instruments used in directional drilling.