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[Paper] Xiehua Zhu (Editorial Board Member of this journal), et al.: Development and Application of High-Efficiency PDC Drill Bits Based on the Critical Fracturing Theory of Rock Plasticity and Brittleness

[Paper] Xiehua Zhu (Editorial Board Member of this journal), et al.: Development and Application of High-Efficiency PDC Drill Bits Based on the Critical Fracturing Theory of Rock Plasticity and Brittleness

To further enhance the drilling efficiency of PDC bits in Cambrian dolomite formations, it is necessary to optimize the bit's hydraulic design based on the DS675H drill bit structure. This optimization aims to improve the efficiency of cuttings removal by the drilling fluid, as well as enhance cooling effectiveness for the center and shoulder cutting elements. Such improvements will ultimately boost the bit's service life and rock-breaking performance. Additionally, further refinement of the tooth arrangement parameters along the outer diameter arc of the bit is required to minimize tip chipping and bolster the bit's circumferential stability.

13

2025

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06

100 Questions About Drilling—Part Four

100 Questions About Drilling—Part Four

The maximum formation pressure coefficient of the openhole section should be used as the basis, with an additional 0.05–0.10 g/cm³ for oil zones and 0.07–0.15 g/cm³ for gas zones.

12

2025

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06

Drilling 100 Questions, Part 3

Drilling 100 Questions, Part 3

Drilling speed increases, even leading to lost circulation, while circulating pressure drops.

12

2025

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06

Drilling into 100 Questions, Part Two

Drilling into 100 Questions, Part Two

When the fish head is below the rotary table, quickly retrieve the drill string by connecting a kelly and using a fishing spear fitted with a slip.

12

2025

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06

100 Questions About Drilling—Part One

100 Questions About Drilling—Part One

When drilling rapidly—characterized by high drilling speed and abundant cuttings—it's crucial to address the poor suspension capacity of the drilling fluid. To prevent sand settling and subsequent stuck pipe during make-up connections due to prolonged fluid standstill, it’s essential to "stop the pump late and start it early," thereby minimizing the time the drilling fluid remains stationary.

12

2025

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06

Industry Tech Update | Schlumberger’s Cutting-Edge Geothermal Drilling Technology: Tackling 277°C Heat While Achieving a 30% Leap in Drilling Speed

Industry Tech Update | Schlumberger’s Cutting-Edge Geothermal Drilling Technology: Tackling 277°C Heat While Achieving a 30% Leap in Drilling Speed

In the field of high-temperature geothermal development, Schlumberger has successfully tackled the extreme 344°C operational challenge thanks to breakthroughs in its three core technologies. Its latest geothermal drilling solution delivers: a drill bit lifespan extended by three times, a 30% increase in drilling speed, and zero degradation in cementing strength—redefining the boundaries of geothermal resource exploitation.

11

2025

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06

How is vibration reduction achieved with PDC drill bits? Through a coupling model combined with parameter co-optimization.

How is vibration reduction achieved with PDC drill bits? Through a coupling model combined with parameter co-optimization.

As the oil and gas industry pushes deeper into exploration, controlling drilling costs and improving efficiency have become the industry’s central challenges. In drilling systems, drill bit performance directly impacts costs—making polycrystalline diamond compact (PDC) bits, with their low cost, high stability, and powerful cutting ability, the "main force" in oil exploration and development. However, to achieve personalized PDC bit designs tailored specifically to different geological formations, a precise dynamic modeling approach is essential—a technical bottleneck that the latest academic research is now aiming to overcome.

29

2025

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05

Drilling Speed-Up Tool — Hydraulic Oscillator

Drilling Speed-Up Tool — Hydraulic Oscillator

The primary method of applying drilling pressure to the bit is by relying on the weight of the drill string to crush the rock. However, this traditional pressurization technique often faces certain limitations in field operations such as large-displacement wells, highly inclined wells, and horizontal wells.

11

2025

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04

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