Flat PDC Cutters for Fixed Cutter Drill Bits

Flat PDC cutters are the most widely used style of polycrystalline diamond compact cutters on fixed-cutter drill bits. The cutting face of the insert is planar, providing a large, stable contact area with the rock. When mounted at the correct back rake and side rake angles, the cutters efficiently shear the formation rather than crushing it, which improves rate of penetration and reduces energy losses.

TANK DRILLING flat PDC cutters are used on:

Steel-body and matrix-body PDC drill bits

Core bits for geological and mining exploration

Directional and horizontal drilling bits

PDC bits for water wells and geothermal wells

They are suitable for many soft to medium-hard formations with varying degrees of abrasiveness, including sandstone, shale, limestone and interbedded sequences.

Each flat PDC cutter consists of two main parts:

Polycrystalline diamond table – a flat working surface made from synthetic diamond particles sintered together under ultra-high pressure and high temperature (HPHT).

Tungsten carbide substrate – a cylindrical base that supports the diamond table and anchors the cutter into the bit body.

Under HPHT conditions, cobalt from the carbide substrate infiltrates the diamond mix and acts as a catalyst. The process creates strong diamond–diamond bonds and a robust interface between the diamond table and the substrate.

For our flat PDC cutters we typically adopt a D–D key or 12-petal interface geometry between the two layers. This serrated interface redistributes residual stresses and reduces the risk of delamination during impact and thermal cycling.

Key design parameters we control include:

Diamond layer thickness

Diamond grain size distribution

Cobalt content and grain size in the tungsten carbide base

Chamfer width and angle on the cutting edge

By tuning these variables, we supply grades optimized for impact resistance, abrasion resistance or a balance of both.

Our flat PDC cutters are produced on HPHT presses with tightly controlled cycles for pressure, temperature and holding time. Each production batch is monitored and logged to ensure repeatability.

Quality control covers:

Incoming inspection of diamond powder and carbide blanks

Dimensional checks for diameter, height and chamfer

Microscopic examination of the diamond table and interface zone

Abrasion and impact testing on dedicated rigs

Batch traceability for every shipment

This combination of process control and testing gives bit manufacturers confidence that each flat PDC cutter behaves predictably in the field.

Compared with older-generation cutters or pure tungsten carbide inserts, our flat PDC cutters offer obvious benefits:

• Higher wear resistance – the polycrystalline diamond layer has much higher hardness than carbide, reducing flank wear and maintaining sharp cutting edges.
• Stable shearing action – the flat face geometry generates a smooth, controllable depth of cut and even torque response.
• Improved bit life – extended cutter life allows the bit to drill longer intervals before dulling, reducing trip frequency.
• Better drilling economics – higher ROP and fewer bit trips directly reduce cost per meter.

In many standard applications, operators report that bits equipped with our flat PDC cutters drill one extra interval or complete an entire section with a single run, compared with previous designs.

A directional drilling contractor working on a shale gas pad needed to drill an 8½" horizontal section through interbedded shale and thin limestone streaks. Their original bit, fitted with a conventional grade of PDC inserts, required two runs to complete each wellbore and often showed chipped cutters on the shoulder.

After switching to bits equipped with TANK DRILLING flat PDC cutters:

Average ROP increased by approximately 28% in the lateral section.

The bit completed the interval in a single run on three consecutive wells.

Post-run dull grading showed more even wear with very few broken cutters.

The contractor reduced bit-related time and saved on both bit costs and rig hours, while maintaining directional control in the curve and lateral.

We supply flat PDC cutters in common industry sizes such as 0808, 1008, 1308, 1313, 1608, 1613 and 1913, as well as special dimensions on request. Options include:

Standard, impact-resistant and abrasion-resistant grades

Different chamfer geometries for soft or hard formations

Customized diamond thickness and interface designs

Planar PDC inserts for core bits and special tools

Whether you are designing a new fixed cutter bit or updating an existing product line, our engineering team can recommend suitable flat PDC cutters for drilling based on formation type, bit design and operating parameters.