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Drill Bit Basics

Drill Bit Basics

PDC drill bits perform best in large sections of homogeneous, soft to medium-hard formations. They are not suitable for drilling through gravel layers or alternating soft and hard formations.

04

2025

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04

Fundamentals of Rotary Steering Drilling Systems

Fundamentals of Rotary Steering Drilling Systems

The Rotary Steering System (RSS) is a tool that enables real-time control of the downhole drilling direction, essentially giving the drill bit "sharp eyes" and a "steering wheel." This innovation allows for efficient, precise, and single-trip drilling straight through the target formation—a game-changing advancement in horizontal drilling technology since the 1990s.

24

2025

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03

Basic Knowledge of Casing Drilling

Basic Knowledge of Casing Drilling

Casing drilling refers to using casing instead of drill pipes to apply torque and weight-on-bit to the drill bit, enabling both rotation and penetration during drilling. In this method, traditional components like drill pipes and heavy-weight drill collars are no longer used—instead, the drill bit is lowered into the wellbore via wireline tools, allowing it to be raised and lowered within the casing. This innovative approach eliminates the need for frequent trips in and out of the hole, significantly reducing risks such as blowouts, stuck pipe incidents, and other unexpected accidents. As a result, drilling safety is greatly enhanced, while drilling costs are substantially lowered.

14

2025

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03

Structure and Working Principle of Screw Drilling Tools

Structure and Working Principle of Screw Drilling Tools

When chloride levels in the mud are high, motor life can be shortened due to corrosion—this effect becomes even more pronounced at elevated downhole temperatures. If a screw motor has already been used in mud with high chloride content, it should be flushed as thoroughly as possible at the wellhead after retrieval to prevent corrosion of the motor.

14

2025

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02

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