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Calyx and Core Drilling

The document discusses various drilling methods, focusing on core drilling and calyx drilling. Core drilling is essential for obtaining uncontaminated samples for geological investigations and utilizes specialized diamond core drills and derricks for efficient operation. Calyx drilling is a cost-effective technique for constructing large-diameter shallow wells in hard rock formations, using a hollow steel tube to create an annular ring and core inside the well.

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Sheeja P.S
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333 views5 pages

Calyx and Core Drilling

The document discusses various drilling methods, focusing on core drilling and calyx drilling. Core drilling is essential for obtaining uncontaminated samples for geological investigations and utilizes specialized diamond core drills and derricks for efficient operation. Calyx drilling is a cost-effective technique for constructing large-diameter shallow wells in hard rock formations, using a hollow steel tube to create an annular ring and core inside the well.

Uploaded by

Sheeja P.S
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Miscellaneous Drilling

Methods

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Core Drilling
Purpose Equipment

Core drilling is essential for obtaining uncontaminated Diamond core drills are specifically designed for this purpose.
samples of underground formations. This data is crucial for They feature specialized core bits, available for shallow,
various purposes, including soil and rock sampling, geological medium, and deep bores. These drills can be powered by
and mining investigations, groundwater prospecting, and electric motors, air motors, or diesel engines and are
foundation engineering. equipped with hydraulic or pneumatic rod extractors,
gearboxes, and controls.

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Core Drilling: Equipment and
Processes

1 A derrick is used to 2 One-leg derricks are


withdraw and insert the suitable for rods up to 6
drill string, consisting of meters long, while tripod
drill rods connected to the derricks can handle rods up
core bit. The masts of the to 9 meters.
derrick are mounted directly
on the machine.

3 A wide range of tools and accessories, such as automatic rod


lifters, brakes, holders, hoisting swivels, blocks, safety hooks, and
water swivels, facilitate efficient rod handling.

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Calyx Drilling: Large-Diameter
Shallow Wells
Application Mechanism
Calyx drilling is primarily used for A calyx drill bit, a hollow steel tube
constructing large-diameter shallow with two inclined slots, is
tube wells in hard rock formations. connected to a core barrel and then
It offers a cost-effective alternative to drill rods. These components are
to other drilling methods. rotated mechanically.

Cutting Action
Chilled shots are fed to the bottom of the bit through the drill string along with
water. These shots are ground by the bit to form abrasive material with sharp
edges that cut into the rock, forming an annular ring and a core inside the core
barrel.

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Calyx Drilling: Applications

The core barrel is retrieved from the well by grouting the core Calyx drilling is an established technique for creating shallow
with quartz chips. This method is particularly effective for wells, typically used in regions where water sources are
constructing large-diameter tube wells, especially in hard rock located relatively close to the surface.
formations.

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