Overburden Casing System, also named Eccentric Casing System, is suitable for drilling water wells, geothermal wells, short mircopiles, medium mini-type grouting hole of building, and diamond harbour projects.
Economy: Eccentric is the most economical solution because its ingenious reaming wing allows the bit to be retrievable, so it can be used at the next hole.
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Working Principle: When drilling, the reamer bit will rotate out to enlarge the hole enough for the casing tube to slide down behind the reamer. Upon reaching the required depth, the drill pipe will drill in the reverse direction, retracting the reamer bit and allowing the whole system to pass through the casing.
A: When drilling starts, the reaming sleeve opens and the borehole range increases to accommodate the casing shoe and tube.
B: After drilling through the overburden layer, reverse circulation is applied, the reaming sleeve circles up, and the eccentric bit lifts out.
C: The casing can remain in the borehole to prevent collapse during pipe withdrawal and concrete grouting.
D: Regular drilling bits can then be used to reach the required depth in the rock stratum.
Frequently Asked Questions
Q1: What is the primary application of the Overburden Casing System?
It is primarily used for drilling in unstable formations, such as water wells, geothermal wells, and anchoring projects where the borehole might collapse.
Q2: How does the eccentric reamer bit work?
The bit rotates out to enlarge the hole for the casing tube to follow. When drilling is finished, it rotates in the opposite direction to retract, allowing the bit to be pulled through the casing.
Q3: Can I request specific button or face designs for the bits?
Yes, we offer various face designs (Flat, Convex, Concave) and button shapes (Spherical, Ballistic, Parabolic) to suit different rock conditions.
Q4: What is your production capacity for the Casing System?
Our current production capacity is approximately 2000 sets per week, ensuring timely delivery for large-scale projects.
Q5: Are samples available for testing?
Samples can be provided for quality testing purposes. While they are paid, we offer a discounted price for sample orders.
Q6: How do you ensure the quality of the bits?
We use high-grade tungsten carbide and steel, processed with CNC machinery and 100% strict inspection before packing and shipping.
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