When to Use Water Drilling Rig？

For water well drilling rigs, the general requirements are: simple configuration, low energy consumption, easy operation, high mobility, multi-functionality and small size. In practical application, the rig must be selected according to the stratum, hole diameter and depth, and drilling method.

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1. Price

Machine price is the key factor for people to choose the right drilling rig as a one-time investment. The price of the machine increases with the increase of hole diameter and depth.

From the viewpoint of drilling methods, submersible drilling rigs are more expensive than core drilling rigs, and hydraulic drilling rigs are more expensive than vertical shaft drilling rigs, which are mechanical drilling rigs.

From the perspective of mobility, truck-mounted drilling rigs are more costly than crawler rigs.

Hydraulic Rotary Truck Mounted Borehole Drilling Rig

2. Operation cost

Operating costs can significantly affect the profit one can make in the drilling business. Net profit is the water well drilling revenue that the driller receives from the water well user minus the operating costs.

Operating costs include personnel salaries, casing, mud and fuel costs, and rig maintenance costs.

In terms of rig type, submersible hole (DTH) rigs have higher operating costs than rotary drilling rigs that use mud pumps. This is because submersible drilling rigs require air compressors and have much higher fuel consumption. Compared with hydraulic drilling rigs, vertical drilling rigs (mechanically driven) are more economical.

3. Drilling efficiency

Drilling efficiency depends on the formation, operator's skills/experience, rig type and drilling method.

For rocky conditions, the most efficient method is to use a submersible drilling rig that works with an air compressor.

For soil, clay and sand conditions, the best method is to use a drilling rig with a mud pump.

For cobbles, a reverse circulation system is the most suitable method of drilling. Simply add a set of reverse circulation drilling tools to the existing drilling rig.

  Crawler Mounted Water Well Drill Rig for Sale

4. Drilling method

From the working principle of the drilling rig, there are 3 main drilling methods:

The submerged drilling method, which needs to be used with an air compressor. This is a good method for rock conditions.

Mud pump rotary drilling is a more economical way of drilling, ideal for soil, sand and clay layers, and for rock, the drilling speed will be lower than submerged drilling.

With auger drilling, no air compressor or mud pump is required for drilling. However, it can only drill soil, clay and sand.

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In terms of drilling process, we have 2 types of drilling methods:

Direct circulation drilling where drilling fluid (air or mud) is passed through the drill pipe and rock chips are carried away through the space between the outside of the drill pipe and the hole wall.

Reverse circulation drilling, which requires a double-walled drill pipe. The drilling fluid passes through the space between the inner wall of the outer pipe and the outer wall of the inner pipe. It is the most effective drilling method for cobble and sandy geological structures.

5. After-sales service

Service in the after-sales market is another key point in rig selection. During the drilling operation, the rig will have problems such as damaged parts and rig misoperation. All this requires timely and professional guidance from the rig manufacturer. Otherwise, it will affect the rig user's business.

  Water Well Bore Hole Drilling Rig for m

6. Spare parts availability

People need to consider the availability of spare parts when buying a drilling rig. It is part of the operating cost. If spare parts are not easily available, it means you have to pay more to get it and it will take longer. All this will definitely affect the profitability of the drilling business.

7. Safety

Safety is the first priority in choosing a rig, including the safety of operators, service personnel and people around the rig during drilling and travel.

Therefore, safety guards, emergency stop devices, and dust collectors are needed to protect personnel from death or injury.

8. Environmental Protection

Nowadays, the requirements for environmental protection have increased in all countries, so the engine emission level and noise level need to be considered when selecting a drilling rig.

The buyer needs to refer to the standard code of the country or region where the rig will be used.

These are just some of the basics when selecting a drilling rig. It can provide guidance to entrepreneurs when they are planning to buy a drilling rig.

A water well drilling rig is a large machine that is generally used for drilling operations on construction sites or drilling water wells. It is also used by some large enterprises, such as oil, gas, ore and other projects. Drilling through a machine is handy for us to get oil, minerals, etc. We usually install two huge columns on both sides, which must be fixed firmly. Since the rig is in the middle, the rig generates a huge amount of power during operation. If it is not fixed securely, it may cause stoppage of operation or other dangerous accidents. Once installed we also needed to run a very thick pipe to the rig and a sump to drain the sludge. When working, at atmospheric pressure, circulating fluid goes deep downhole to keep the drill bit rotating and moving forward. The circulating liquid then brings out the sludge inside. After settling for a period of time, the circulating liquid is circulated according to the previous method.

       Rotary drilling rigs can be divided into rotary table drilling rigs, power heads and downhole power drilling rigs according to the power transmission method. The rotary table drilling rig is equipped with a rotary table at the wellhead of the drilling floor. There is a square hole in the middle part of the turntable. The kelly at the upper end of the drill string passes through the square hole. The kelly is connected to the drill string and bit. When the turntable is driven by power, the drill string and drill bit rotate together to achieve the purpose of breaking rock. Powerhead rigs are hydraulically powered from the top, driving a rotating rod that drives the drill bit to break rock. The downhole dynamic drilling rig uses the downhole dynamic drilling tool to drive the drill bit to break the rock. The drill string does not rotate during the drilling process, so the equipment wears less and has a long service life. It is especially suitable for directional drilling, which is divided into turbo drill, auger drill and electric drill.

       Water well drilling rigs mainly rely on the rotary motion of the drilling tool to break rocks and form holes. The common ones are large and small tank cone drilling rigs, forward and reverse circulation rotary drilling rigs, hydraulic power head drilling rigs, down-the-hole hammer vibration rotary drilling rigs, etc. A simple rotary drilling rig only has a drilling device, while a well-structured rotary drilling rig consists of a drilling device and a circulating well washing device. The drilling tools of the rotary drilling rig include drill pipes and drill bits. The nominal diameters of commonly used drill pipes are 60, 73, 76, 89, 102 and 114 mm respectively. There are two types of drills: full drills and ring drills.

       The rotary drilling rig drives the drilling tool to rotate through the rotary mechanism (power head). The drill bit installed at the end of the drilling tool cuts the soil and drills the hole, adopts wet slag discharge, uses a high-pressure water pump to inject the flushing medium (water and drilling flushing fluid) into the drilling rig at a certain flow rate and pressure, and uses the positive circulation process to discharge the slag in the hole And the soil is discharged, forming a hole. At present, in water well construction, three commonly used construction methods are cemented carbide drill bit drilling, steel particle bit drilling and roller cone bit drilling techniques.

       The working process of the water well drilling rig is inseparable from the use of the pump, which is used for reverse circulation operations. Under the action of atmospheric pressure, the circulating fluid flows from the sedimentation tank to the bottom of the well through the return ditch along the borehole annulus. At this time, the turntable drives the drill pipe and drives the drill bit to rotate and drill the hole. The negative pressure formed by the suction of the mud pump sucks the debris mud into the inner cavity of the drill pipe, then rises to the faucet, and is discharged into the sedimentation tank through the mud pump. The precipitated circulating fluid continues to flow into the wellbore, and the wellbore continues to circulate, forming a reverse circulation drilling operation. Mud or water enters through the drill pipe and exits the wellhead. This is a positive circulation drill. Mud or water is drawn from the drill pipe and flows in from the wellhead. This is a reverse circulation drill.

Contact us to discuss your requirements of Mud Pump for Sale. Our experienced sales team can help you identify the options that best suit your needs.