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What is Water Well Drill Rod and Why Do We Use Them?

May. 06, 2024

The Complete Guide To Drill Rod - TDL

I. Introduction

Drill rods, which are commonly known as hydraulic drill rods, are cylindrical tubes that are connected using cylindrical tubes that connect to the drilling bits and the drilling machine and are used to drill holes on solid materials. Drill rods can also be defined as long pieces of steel that can be easily molded and are used to manufacture different tools. Most drill rods are circular in shape but some are also square. Drill rods are commonly used in the machinery and the manufacturing industries. They are used in the manufacturing of cutters, hot-work tools, machine parts, and many others. Drill rods come with many distinct differences in regards to the durability, cost, resistance and their applications.

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Drill rods are of great importance in many industries, mainly the construction and manufacturing industries. Although drill rods are used in various ways in industries, they are used according to their grades in different types of work. Thus, not all drill rods for the same purpose.

II. Types of Drill Rods

A. Water well drill rods

Water well drill rods are common in the water drilling industries and firms like the water drilling contractors. The drills are basically used in drilling of water below the earth surface. They are therefore made of durable and hard substances that are resistant to harsh grounds like rocks. To make them hard enough for the task they are made of high-quality steel and other durable materials. They are made of slender tubes and cylindrical metal tubes that are connected to a drill bit that rotates on the surface of the ground and penetrates inside forming a circular shape. The drill bit rotates the drill rod until the water surface is attained.

B. Mining and exploration drill rods

Mining and exploration drills are used by the mining companies for the purpose of drilling and extracting minerals from the earth’s crust. They are made of hard and durable materials that can withstand the harsh conditions on the ground. The difference between mining and exploration drill rods is that mining drills are used to extract minerals from the earth’s crusts and are of bigger diameter than the exploration drills. The exploration drills on the other hand are used for the purpose of determining the existence of minerals in a particular region.

C. Directional drilling rods

Directional drill rods are used to drill holes that do not go straight or vertically down as a result of various aspects on the ground such as rocks or existing pipes. It is mainly used in the drilling of oil and gas. If the drill faces 180 degrees away from the pipe and the casing then directional drilling happens. Technically over the past decades, advancements in technology have made it possible for improvements in angles, turns and underground distances in the directional drilling. The drilling in any particular direction is made possible by the use of BENT sub. This consists of a part of the drill pipe that is usually bent at an angle and therefore can be directed to any position. Directional drilling is important as it brings about precision and has control during the drilling process.

III. Materials Used in Drill Rods

A. Carbon steel drill rods

This is a type of drill rod that consists of carbon as the main alloy though other elements may be present in the manufacture in small amounts. The carbon that is present in the rod enhances the durability and increases the strength of the drill rod. Other elements include steel which is used in some of the manufacturing processes to make the drill rod tough. Oil and tempering agents are also used in the heat treatment process for durability and to increase the strength. Finally, some of the carbon rods may be used to protect the carbon steel rod from wear and corroding.

B. Alloy steel drill rods

The rods are made up of high-quality steel alloys that provide the drill rod with the desired strength, durability and make them resistant to wear. The alloys used may vary depending on various things but the commonly used alloy elements are the molybdenum, vanadium, chromium and nickel.

C. Stainless steel drill rods

In this drill rod, stainless steel is the most used alloy. It also uses iron, chromium and nickel as other additional elements. Carbon steel may be used in some instances because it’s cheap but may not be used in harsh areas, a coat named tungsten carbide is also used to prevent wear and increase the durability. Finally, a diamond coating is used to prevent the drill rod from wearing out.

IV. Manufacturing Processes

A. Cold drawing

It involves the following processes:

Coating: The surface of the raw stock or coil is coated with a drawing oil to aid cold drawing.

Cleaning: Abrasive scale (iron oxide) outer of the hot rolled rough stock is removed.

Pointing: Several inches of the lead ends of the bar or coil are reduced in size by bending or extruding so that it can go through freely to the drawing die. This is done due to the die opening being smaller than the original bar or coil section size.

Drawing: In this process, the material being drawn is at room temperature (i.e., Cold-Drawn). The pointed/reduced end of the bar or coil, which is smaller than the die opening, is passed through the die where it enters a gripping device of the drawing machine. The drawing machine pulls or draws the remaining unreduced section of the bar or coil through the die. The die reduces the cross section of the original bar or coil, shapes the profile of the product and increases the length of the original product.

Finished Product: The drawn product, which is referred to as Cold Drawn or Cold Finished, exhibits a bright and/or polished finish, increased mechanical properties, improved machining characteristics and precise and uniform dimensional tolerances.

B. Heat treatment

In this method the material is subjected to heat and then cooled. Drill rods that are subjected to this process are able to withstand the stresses that they undergo while the process of drilling is taking place. The process also has the following advantages:

  • Increases the surface hardness at the ridges
  • Increases the life of the thread profile
  • Eliminates the appearance of wears
  • Gives more rod life hence increasing the drilled meters per rod.

C. Thread rolling

This is the process in which the physical, hardening and strengthening ability of a material is changed. It has low cost and increases the production. In general, it involves the formation of threads on the drill rod by the use of a thread rolling machine. It involves the following steps:

  • Preparing the drill by ensuring that it is clean and straight
  • Inserting the rod in the machine which consists of sets of dies. The dies are pressed on the rod which leads to deformation of the rod and formation of threads
  • Inspection of the rod is the third step where the rod is inspected to make sure that the required conditions are met.
  • Finally, any excess materials are cut off and protective coats are applied on the surface to prevent corrosion.

D. Surface treatments

This is a very important aspect in the manufacture of drill rods, where the surfaces of drill rods are treated against corrosion and wear by coating, plating and heat treatment. Coating is the process in which the surfaces are equipped with a protective layer while heat treatment involves the use of heat to make the surfaces hard. By increasing the hardness of the rod, they are more resistant to tear and wear during the drilling process. Plating involves the deposition of a thin layer of metal on the surface of the drill.

V. Thread Types

A. API threads

The threads are generally used in the drilling of applications that are above 153 mm in diameter and up to 12 meters. All the drills come in with strong joints and contain nitride to enable them to have the limited wear resistance. The API threads allow for the manipulation of some threads that are essential for the activeness of the thread. There are 4 different types of API threads namely;

  • Line pipe thread
  • Round thread
  • Buttress thread
  • Direct connection type of a thread

B. DTH threads

Down-The-Hole drilling threads are used where blasting force is required such as breaking large rocks. DTH drilling involves using a hammer string at the end of the drill bit. The hammer strikes the rock repeatedly as the drill string rotates forcing the rock to break. This drill method relies on three main elements to drill holes. These are weight, rotation and air. It is commonly used in construction sites, drilling boreholes and in the mining industry to blast rocks.

C. Other proprietary thread designs

Drill rods have a variety of customized thread patterns, each with special qualities and benefits. Here are a few illustrations:

  • DCDMA threads: The Diamond Core Drilling Manufacturers Association (DCDMA) developed these exclusive thread types for use in diamond core drilling.
  • Mayhew Junior threads: These threads, created by the Mayhew Steel Products firm, are frequently used in drilling operations for geotechnical and environmental purposes.

VI. Drill Rod Selection Criteria

A. Drilling application

1. Geology and formation

This is more applicable in the oil drilling industry where the geology and formation affect the penetrating rate. The drilling bit that is selected is highly dependent on the different types of drilling bits, size of hole, the rotation speed and efficiency of personnel and the equipment’s. Geological factors affect the rate of penetration. The formation also affects the resistance to penetration. The geological and formation factors affect the drilling process as they determine the type of bit to use, the weight of bit, the rotation speed, hydraulic action among many other factors.

2. Drilling depth

Additional reading:
P&Q University Lesson 4- Drilling & Blasting

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For most underground drilling, the holes are not deep, for example 200 meters instead of 1,000 meters. This may cause the engineers to choose more conventional drilling methods rather than using wireline drilling methods. The thinner kerfs found in core bits used in conventional drilling can lead to a better rate of penetration in any type of ground.

B. Drilling equipment compatibility

Drilling and excavation require a wide variety of tools and it depends on the type of the project. When choosing the tools needed one should consider the location which means that the type of soil and the substrate of the moisture content will have to be considered. Inspections should be regularly carried out and all the data including the soil sampling results should be available. All this should be available before the billing stage in order to determine on the compatibility and the right tools to use for the job.

C. Budget and cost considerations

Cost is a big consideration when choosing the drill rod to use. To maximize the budget of drilling one should use the right drill for the appropriate task and therefore saving on the cost of drilling. The cost of drill rods varies due to the depth of drilling, the geological conditions of the area among many other factors. Though it is important to economize on the budget it is important to choose the best drill rods that will produce maximum output and attain the required results.

VII. Drill Rod Maintenance and Handling

A. Proper storage and transportation

The store in which the drills are kept should be kept dry, ventilated and the moisture-proof kept in good condition. Drill rods with damaged packaging or damp, bent, bruised, or blocked water holes should be inspected and repaired one by one, and then repackaged and stored separately.

B. Regular inspection

Drilling rods should be checked at regular intervals to ensure that they are not faulty. They should be checked at least once per month though it is appropriate to check them every day after work to make sure that they are in the right working conditions.

C. Thread lubrication and protection

Threads should be greased using a special greasing agent to provide proper protection against corrosion and metal to metal in diamond tip drill rods that is employed in rock drilling when high temperatures are applied.

D. Avoiding common drilling issues

Common mistakes such as mixing rods from different manufacturers and choosing the wrong drill rod should be put into consideration in order to reduce the cost of maintaining the tools. Fixing common problems with the drill rods such as replacing worn out rods and regular lubrication should be put into consideration to avoid bigger problems.

VIII. Conclusion

Choosing the right drill is important as it makes the drilling process easier and saves on the time required to carry out a particular project. Drill rods come in various sizes and diameters and therefore it is crucial to choose the right drill with the appropriate diameter for the specific activity thus reducing on wastage of materials during the process. Tools and equipment that have undergone proper maintenance offer maximum performance and quality work and therefore drill rods should be maintained regularly to prevent them from breaking down during the drilling process and to offer a longer production life.

How Does Water Well Drilling Equipment Work?

What Well Drilling Equipment is Used?

In this industry, we understand that to accomplish your project efficiently, aside from using the most qualified personnel, we must also use modern, robust, and reliable drilling equipment. For this reason, C&J works with the newest and most diverse, state-of-the-art equipment for our drilling projects. Quality and customer satisfaction, for us, remain top priorities. At C&J Well Company, we use reliable, low-maintenance, and powerful Versadrill drilling rigs that consistently outperform the competition. Our water well drilling rigs easily maneuver in and out of job sites with these compact, all-wheel-drive rigs. Whether it’s a large commercial job or a small residential drilling project, our Versa-Drill rigs are built to meet your needs efficiently and economically. In this article, we will go over the basic parts and features that make our water well drilling equipment stand out in Central Indiana. 

C&J Drill Rigs

The best drill rig is one that’s dependable, easy to use, and versatile. For this reason, C&J has multiple drill rigs for divergent applications. When we were founded 25 years ago we only had a 1966 Failing 1250 small mud rotary rig. As you can imagine, a lot has changed since then—we’ve owned over 10 Versa-Drill rigs throughout the years and our current fleet is made up of three Versa-Drill rotary rigs and one drill rig for bucket wells. Direct rotary drilling consists of cutting a borehole by means of a rotating string of drill rods and a bit against the formation. By circulating water-based drilling fluid, the drilled cuttings are carried to the surface. Air rotary drilling is often utilized in hard rock drilling. The air rotary equipment provides an estimation of the amount of water a well may produce. Mud rotary drilling equipment is often used in unconsolidated sediments. The drilling fluid stabilizes the formation, while drilling removes the cuttings from the bottom of the hole.

Versa-drill Geothermal & Water Well Rig Components

Engine & Transmission — Our rigs come with a Peterbilt 348 6×6 powered by PACCAR PX-9 diesel engine with 350 HP and automatic transmission. This makes our rigs reliable and versatile and gives them the power for almost any job. 

Hydraulics — These rigs are equipped with a Durst pump drive box and Bosch Rexroth pumps & motors. All our models are equipped with a direct-drive hydraulic feed system. This makes the rigs both safer and more powerful than the competition since the power is not transferred through cable, chains, or over sheaves and sprockets. That also means no cables or chains to adjust and fail, which cuts back on downtime and expensive maintenance. 

Leveling Jacks — Once the drilling rig is in place, the crew will make sure it is leveled using special feet attached to the rig. Leveling is important to ensure the well is drilled perfectly straight. The derrick is then raised and the first drill rod is set in place to begin drilling.

Drill Rods — The drill rods bore into the ground in 20-foot increments. They start by drilling through the overburden—the combination of dirt, clay, rock, and material that sits above the bedrock. Overburden can be a few feet deep, to a few hundred feet deep, so this part of the process takes time. Drill rods are added every 20 feet until the drill reaches a viable aquifer. It is somewhere within the bedrock that most groundwater is reached.

Throughout this process, you’ll see water and cutting discharge emerging from the hole that is being drilled. The water is actually water that is being poured directly into the hole to keep the drill rod lubricated and cooled as it drills. The discharge is the rock, clay, dirt, and other materials that are being removed from the hole. Because of the tremendous amount of air pressure being used to drill, the air pushes the water and debris out of the well hole.

Derrick — A derrick is basically a crane we extend when it’s time to drill. The derrick is about 40 feet high when extended and it holds and controls the drill rods. The derrick feeds the drill rods down the borehole as needed. Our rigs are capable of up to 25-40,000 lbs of pullback and 22,100 lbs of pulldown. Pullback is the amount of force required to recover the drill string from the hole. It requires more force when the drill is stuck to pull the drill string back up the borehole. Pulldown is the amount of force applied when drilling. 

Drill Rod Mast Carousel — This system utilizes a carousel that is mounted onto the drill rig mast (or boom) so that the drill rods in the carousel are always in the same alignment as the rotation head. Our trucks are equipped with either a 10 or 15-rod carousel. 

Drill Bits — At C&J we use several types of drill bits, depending on what we encounter underground. Diamond bits are designed with speed and durability to break through hard formations. Drag bits are designed for hard clays, pea gravels, and soft shale. Tricone bits are designed for hard rock formations and gravel. Our most common bits are two-cone bits. These are very versatile and able to drill through most formations found in Central Indiana.

Mud Manager — This is the pit with a shaker on it that shakes the cuttings and separates the cuttings from the water. The cuttings stay above ground while the water returns back to cool the drill rods and drill bit.

Mud Pump — This piece of equipment forces drill fluid down the drill rods and back out of the borehole.

Well Casing — The casing, much like the drill rods, is also installed in 20-foot increments. The casing serves an important role in the overall efficacy of your well. It is put in place to keep the overburden from seeping into your well and contaminating the water. Once the casing is installed, it will extend a few feet out of the ground. This ensures surface water and debris aren’t also entering the well from above.

Bucket Rig — Bucket drilling uses a cylindrical bucket with cutting blades or teeth mounted on a hinged bottom to repeatedly cut and lift sediments from the borehole. The process is repeated as necessary to achieve the proper borehole depth. A bucket well is often recommended in areas with very little water production from underground aquifers. 

Water Trucks — The water truck carries the water needed for the drilling process, as well as tools and equipment that may be needed for the job.

All C&J Driller/Operators and Driller’s Assistants are highly trained drilling professionals with the training, experience, and skills required to perform work at any site. We have carried out drilling services for thousands of clients—farmers, homeowners, business owners, industry, utilities, and contractors—throughout Central Indiana who are satisfied with our impeccable services and have developed solid working relationships with us, based on excellent service delivery, trust, and integrity. Contact us today for more info or to start planning your water well drilling project!

Are you interested in learning more about Water Well Drill Rod? Contact us today to secure an expert consultation!

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