What is the difference between rope core drilling rigs and water well drilling rigs? In the following, we will show you that there are significant differences between rope core drilling rigs and water well drilling rigs in terms of their uses, structural design, working principles and application scenarios. The following are the main differences between the two:
1.Core Usage and Drilling Objectives
Rope Core Drilling Rig: Mainly used for geological exploration (e.g. mineral, rock structure analysis, etc.), the core task is to obtain a complete core sample. The core task is to obtain a complete core sample. By means of the rope salvage system, the core can be taken out without lifting the drill, which greatly improves the efficiency and reduces the disturbance of the drill hole.
Water Well Drilling Rig: Designed for drilling water wells with the goal of creating a stable water supply. It needs to complete the drilling, washing and tubing processes, focusing on well depth, hole diameter and wall stability, rather than core sampling.
2.Difference in structural design
Corer and salvage system: the core components include snap mechanism, single-action mechanism, core blockage alarm mechanism, etc., and the core is obtained by quickly extracting the inner pipe assembly through the rope.
Hydraulic and rope drive: Relying on the hydraulic system to drive the rope to achieve the lifting and lowering of the drill pipe and coring operation, adapting to the complex geological conditions.
Drilling Tool Configuration: Diamond drill bits and small diameter drill rods are used, focusing on core integrity.
Circulation Cleaning System: Equipped with mud pump or air compressor to remove rock chips by positive/reverse circulation (e.g. reverse circulation rigs use mud or gas to remove slag).
Support and power structure: four-legged hydraulic cylinders and mast frame are adopted to ensure stability, and the power head drives the large diameter drill pipe through gear reducer.
Drill bit and hole diameter: commonly used large-diameter drill bit (such as pot cone drill bit, ring drill bit), adapting to the needs of crushing different rock formations.
3.Comparison of working principle
Core extraction without lifting: the inner pipe assembly is separated from the outer pipe when drilling, and the core is extracted directly through the salvage device, which reduces the downtime. Precise control: the hydraulic system regulates the drilling pressure and speed to monitor the verticality of the drill hole.
Water well drilling rigs: rock crushing and cleaning is done by rotating or impacting to break up the rock layer (e.g. vertical reciprocating motion of impact drill bit), and circulating fluid or compressed air to remove the debris. Continuous operation: frequent lifting of the drill to change the bit or treat the well wall, especially in large depth drilling.
4.Application Scenarios and Adaptability
Applicable Fields: Mineral exploration, geological survey, tunnelling engineering, etc., where high-precision core analysis is required.
Geological conditions: adapted to complex formations (such as fracture zones and hard rock), but with lower requirements for hole diameter and well depth.
Applicable fields: agricultural irrigation, civil water supply, industrial water supply, etc., focusing on water output and long-term stability of the well.
Geological conditions: suitable for loose soil layer, gravel layer and medium-hard rock layer, some models can drill to more than 500 metres.
5.Efficiency and Economy
High core taking rate (up to 90% or more), reduce the cost of repeated drilling, but the equipment is complicated and the maintenance cost is higher.
Fast drilling speed , but weak core sampling capacity, requiring additional equipment to assist analysis.
