What is directional drilling?

Directional drilling is a broad term used to describe any boring that doesn&#;t go in a straight line vertically down. In fact, even in a vertical well, it might be necessary to deviate to avoid a geological formation or a previous stuck pipe, then return to the original path. In this instance, the driller uses sidetracking techniques.

If you want to learn more, please visit our website SINOCOREDRILL.

In conventional drilling for oil and gas, the drill bit, drillstring, pipe and casing all go down in a straight line. If a driller aims away from the 180-degrees down, that&#;s technically directional drilling. Nowadays, however, it&#;s more likely that there&#;ll be a series of one or more carefully planned directional changes along the wellbore.

Directional drilling techniques have been employed for almost 100 years now. Over the past few decades, technological improvements have meant that angles, turns and underground distances covered are amazing feats of engineering.

Techniques such as multilateral, horizontal and extended reach drilling (ERD) are enhanced oil recovery (EOR) methods that can increase the yield of a downhole dramatically. It&#;s possible for ERD specialists to drill for more than 10 kilometers/6.2 miles. Students of petroleum engineering often get shown illustrations and diagrams that look like tree roots. If we imagine the rig as the trunk of the tree, the directional possibilities of the roots are endless. Even the branches of the roots are comparable to multilateral drilling.

Why is the technique so valuable?

Multiple down holes can be drilled from the same rig, minimising surface disturbance and environmental impact. Also, these boreholes can extend up to a mile down, and for more than five miles at shallower angles. In an oilfield with dispersed deposits, a large radius can be tapped, maximising the expensive asset which is the rig. Rigs and crews have day rates that run into the hundreds of thousands of dollars, one rig working up to five or ten square miles is very cost-effective in comparison to having a dozen or more vertical rigs, which may or may not be tapping into the same accessible reservoir deposits.

Geologists and engineers use terms such as an &#;oil reservoir&#; or a &#;hydrocarbon reservoir&#; to describe underground pockets of resources. Scientific terms give a label to help everyone understand each other, but Mother Nature has different ideas about the way she organises things.

People who perform well plans such as seismic geologists, geoscientists, exploration engineers and CAD experts join together to give the best idea of where oil and gas deposits may lie. Their estimates are based on different types of surveys, and past experience. What they&#;re unlikely to do is pinpoint the exact place where they&#;d access the maximum amount of resources.

When we see reservoirs of water, we can imagine dropping a giant straw into the middle and sucking up the entire lake. The flat surface area of the water and the likelihood of human-made dams and walls might give us a false idea of the topography of an underground reservoir. The bottom of the lake would provide a better insight into the random geometry of the dispersed resource. For example, if your imaginary straw happened to touch a shallow gravel bar in the middle of the lake, you might only extract a small percentage of the water.

On top of this randomness related to upper, lower and outer dimensions, there are plenty of other possibilities:

• By drilling at an angle, more of the reservoir gets explored, since they tend to form horizontally (between formations) not vertically.
• The deposit might not resemble a reservoir at all, it might be oil-saturated sand or shale. Directional drilling is especially valuable in shale, where the formation can be explored to follow richer seams.
• There&#;s a tough rock such as granite between the surface, and the hydrocarbons.
• There&#;s some other reason why the reservoir is inaccessible from above, such as the surface land being a town, mountain, nature reserve or area of special scientific interest (SSI).
• Rather than the oil and gas settling in a single deposit, it&#;s in separate distinct pockets, not clearly joined to each other. This can occur where there are multiple bed dips or altitudes.
• It&#;s common to find deposits below salt domes or fault planes, where the driller faces increased technical risk. Horizontal drilling can avoid salt domes, and reduce pressure on equipment near fault lines.
• The reservoir extends down diagonally so that the &#;shallow end&#; might yield little, and the &#;deep end&#; is hard to drill or find vertically.
• The reservoir is connected but in a very irregular pattern, such as in a series of bars and deep troughs.
• It might be possible to create a land rig, then drill horizontally out into the ocean, or under a lake. This would be cheaper and pose fewer risks.

In fact, these &#;irregular&#; reservoirs are very common. Now that relatively fewer elephant reservoirs are being discovered, and technology improves, directional drilling becomes more critical each year.

Another use for directional drilling is in the event of an uncontrolled, or &#;wild well&#;. If you imagine a well that has broken through the blowout preventer and is gushing, how can you cap it?

This depends on the amount of underground pressure. In some instances, a second control well is drilled so that it intercepts the same point where the original wellbore meets the reservoir. Once the new directional well is completed, it can be pumped with kill fluid.

If the well pressure isn&#;t too severe a relief well can help to release gas so that the original gusher reduces in intensity, allowing it to be controlled. Mud and water are pumped in from a different angle, to get the first well under control and back to proper working order.

How do the engineers know where the end of the drill is?

It&#;s not possible to see hundreds of metres underground, in fact, the drillers and engineers rely entirely on technology to &#;see&#; where they are going. A directional driller has a guide that has been created by the engineers and geologists. Every 10-150 metres, (with 30-40 being typical), survey data is sent back to make sure that the original &#;blue line&#; well path is being followed.

Directional drilling software receives input from multiple measurements while drilling (MWD) sensors in the drill bit, and at any branches or junctions. (Other measurement tools include Electromagnetic MWD and Global Positioning Sensors (GPS)). In addition to MWD technology, mud loggers use logging while drilling (LWD) sensors and software. The drill bit has vibration sensors that can detect the type of formation being drilled at any point. Collars can be added along the length of the well, sending back information to the surface regarding torque, weight and bending.

From the surface, electromagnetic sensors can also track the progress of the drill bit. When all of the data from the drill bit, collars, motors and the surface equipment enter the control panel, a complete representation occurs.

As well as being able to know what is going on, even a mile along the drill bore, drilling engineers can make adjustments in real-time that ensure that everything is going to plan. This is especially relevant when unexpected things occur concerning geology or severe equipment stress.

How can the drill make a turn?

If you were to imagine the mechanics of directional drilling without seeing the technology, you might wonder how the drill could suddenly change direction. Since the motor that turns the drill is at the surface, how can the drill string continue to rotate at 360 degrees while going around a corner?

We now have downhole drilling motors, that can drive the drill bit in a completely different direction to the usual 180-degree downhole starting point. Turbodrills and rotary steering drills are employed in directional situations where they&#;re best suited.

The rotational speed of the drill and the weight and stiffness of the drillstring can also be used to influence direction. One of the original methods was jetting, a high-pressure nozzle shot water or drilling fluid from one edge to the drill bit, creating a weaker side in the formation.

Another traditional method was to use a whipstock. A whipstock is a type of wedge that can redirect the drill. At the desired depth the drill is withdrawn to the surface, a whipstock gets put in place, then the drill goes back down and gets redirected by the whipstock. Next, the drill is brought to the surface again, the whipstock pulled out and then drilling resumes and the bore changes path.

Drill bit sensors can tell the driller about external weight, and rotary speed that can also be used to influence the trajectory. Mud motors can also be used to change direction. With a steerable drill pipe, there&#;s a bend near the bit. The drillstring stops turning, and then there is plenty of time to use chosen directional techniques to reposition the bit to the desired trajectory. When it starts spinning again, it&#;ll start going in the direction that it&#;s now pointing towards. (More about steerable mud motors in the next section).

Equipment used:

Specialised drillbits are used to improve performance and reduce the chance of failure. Schlumberger supply directional PDC drill bits for both push- and point-the-bit rotary steerable systems. Horizontal Technology, Inc. provides &#;Varel High Energy Series bits&#; designed for the unique, rigorous conditions of horizontal directional drilling.

Mud Motors. Downhole steerable mud motors get positioned near the drill bit, which has a bend in it. What happens is that at the correct depth the drillstring stops rotating, then drilling fluid is pumped through the mud motor so that the drill bit starts to turn just due to the force of the liquid. This mud pressure pushes the drill bit into a different angle, and also begins to bite into the formation at a different angle to the central well trajectory. Once the sensors verify that the drill bit is pointing in the right direction, the drillstring starts to turn again.

Rotary Steerable Systems (RSS). Directional drilling by using the mud motor means that often the drill pipe needs to be slid forward while the drill is motionless. A rotary steerable system can drill and steer at the same time. This means that previously inaccessible formations can be accessed.

Bottom Hole Assembly (BHA) configurations are often bent in shape so that they can make turns by using physical manipulations. The video further up the page clearly shows the bend in the drill pipe.

Multi-Shot cameras are fitted inside the drillstring. They&#;re set to take regular pictures on a time-lapse setting. Then these images are sent to the surface control.

Custom whipstocks that work with downhole motors don&#;t need removing in between drilling. These are a significant advance on the old fashioned ones previously mentioned. More time can be spent drilling, and less time removing the drill bit and conventional whipstock.

If you are looking for more details, kindly visit Directional Drill Machines.

Networked or wired pipe. The Intelliserve system from National Oilwell Varco is a broadband networked drilling string system. It can transmit data from the sensors back to the surface.

These are most of the specialist directional equipment used. Plus there is the three-dimensional measuring equipment mentioned previously in this article (MWD, LWD, etc.)

Wellbore stability considerations

Well integrity is perhaps the most crucial aspect of directional drilling. Drilling at deeper, or extended distances, and especially changing direction causes a number of additional engineering challenges and stresses on the equipment.

For example, a downhole drilling motor will always be far smaller and less powerful than one connected to a robust drilling rig above ground. It&#;s more likely to fail, or have insufficient torque or speed to get through challenging geological formations.

The drillstring itself will be less stressed when going in a straight line, every degree of turn add extra friction and unbalanced pressure. If drillstring integrity isn&#;t maintained, the drillstring can snap or get jammed. It could mean that a brand new set of equipment is needed, and a new well might need to be drilled again in a slightly different direction.

Maintaining hydraulic pressure, and wellbore cleaning is much more challenging with these types of wells. Modern directional drilling equipment is so advanced, it can cope with high pressure/high-temperature HP/HT conditions, a mile away, after the wellbore has changed direction.

Directional well planning

Computer simulation programmes are used to simulate the well plan. 2D and more recently 3D modelling programmes give the geoscientists and engineers a visualisation of the planned path. This software is created based on previous knowledge, current seismic and magnetic data, supplemented with real-time data from the MWD instruments.

Horizontal Directional Drilling

There are a few different types of directional drilling. Multilateral drilling is where a downhole bore has multiple lateral (90 degrees) offshoots. For example, a well might be metres in depth but have numerous lateral wells connected to it.  Extended reach drilling (ERD) is categorised by ever longer wellbores drilled from the rig.

Perhaps the most interesting type is horizontal directional drilling because it was the first type, and perhaps the most controversial.

Land tenders offer the right to explore and extract resources from a particular square meterage of land. It&#;s possible to purchase a lease for an oil patch, then drill horizontally into neighbouring territory. Close to a national border, it&#;s been known for drillers to drill into another country.

This is different from straightforward situations, where two territories happen to tap into the same reservoir. The industry has guidelines and regulations. Simultaneous operations (SIMOPS) and combined operations (COMOPS) have strict procedures for situations where well interference can occur.

The oil industry is aware of the ability to horizontally tap deposits under other peoples leases, lawsuits related to this started way back in the s.

Of course, the majority of horizontal drilling is done for good reason, not to cross borders of ownership or sovereignty. Sometimes horizontal directional drilling is the only possible way to tap a reservoir, such as the case of dilling under a town or nature reserve. Other times it&#;s a cost-saving exercise, to drill under a salt dome or mountain. Lastly, drilling horizontally can be the best way of maximising extraction by reaching more sections of a reservoir.

Horizontal directional drilling (HDD) was developed to solve the problem of installing underground products in areas with challenging conditions such as urban settings, river crossings, rail lines and busy highways. As costs have come down and equipment design has matured, HDD may be the preferred method of putting product in the ground regardless of environment because it is often more cost effective than open trenches. Typical markets include water, sewer, electrical, fiber optic, and gas and oil.

How Does Horizontal Directional Drilling Work?

At its heart, HDD is easy to understand. Existing underground infrastructure is located. A drill rig rotates a drill string and drives it through the subsurface. This drill string consists of drill rods and a cutting head. Some method of tracking the string is used, either a stringline back to the surface or an employee with a locator walking over the bore path.

Steering is enabled by the cutting head. When the string emerges at the predetermined exit point, a backreamer is pulled back through to enlarge the initial hole. Pipe or other product is pulled through the resulting bore. Drilling fluids lubricate the parts, cool the cutting head, remove drilling spoils and stabilize the bore. Entry and exit locations are restored to their original condition to complete the process.

Advances in the HDD Market

Part of the maturation of HDD is the proliferation of HDD machines and hardware. This proliferation is driven by two things: soil conditions and bore dimensions. Imagine two HDD jobs. One is drilling through loamy soil to put 50 feet of 4-inch water pipe under a busy roadway. One is drilling through rock to put 800 feet of 30-inch sewer line under a river. Conceptually these jobs are similar; in detail they share nothing.

Beyond the HDD equipment itself are many additional requirements, a fact not always fully appreciated by those considering entering the HDD market. &#;For those outside the industry, there&#;s a general lack of knowledge of the scope of what&#;s required,&#; says Dan Vroom, industrial equipment and sales training manager, Vermeer.

&#;Typically you need a truck, trailer and CDL driver. You need support equipment, including a fluid mix system and a vacuum truck. Compliance is a big concern, from fluid disposal to site restoration. Scheduling and people management are important considerations.&#;

Selecting the Right Drill Bits

After investing in the major pieces, you&#;re pretty well restricted to the work your equipment will handle. But one component is easily tailored to the job: the bit. &#;Our Omni Bit is our universal bit,&#; says Cory Maker, horizontal directional drill product manager, Ditch Witch. &#;It works very well in a wide range of conditions.&#;

Why not just go with the hardest bit you can find, knowing it will gnaw its way through virtually any soil or rock? &#;A super-hard carbide bit probably won&#;t steer as well as a standard bit in some soils so it&#;s not the ideal choice for a primary bit,&#; says Maker. &#;On the other hand, sand is very soft but is also very abrasive. A standard bit will easily cut through sand but a carbide bit will last much longer in those abrasive conditions.&#;

Whatever bits you choose, maintain them and replace them when they&#;re worn out. &#;Some contractors assume if the majority of the bit or reamer teeth are still in place that the bit is still as productive as when it was new,&#; says Vroom. &#;That&#;s often not the case.&#;

Directional Drilling Tracking Technology

As with bits, tracking technology also requires careful selection. Wireline is used where walk-over is not an option (rivers, interstate highways, etc.). &#;Wireline initially used magnetometers,&#; says Richard Levings, product manager, American Augers. &#;But those are affected by ferrous materials, whether soil type or in-place structures, so gyroscopic systems are growing in popularity and currently account for some 40 percent of the market.&#;

Walk-over trackers vary in sensitivity and accuracy, which is reflected in prices. &#;Less expensive trackers have fewer features and don&#;t discriminate as well against interference as higher-cost units,&#; says Vroom. Interference can be a big problem. Sources of passive interference include soils with high salt or iron content and inground infrastructure with metal components. Active interference comes from handheld radios, cell phones and traffic loops.

Top 3 Considerations

Our experts offer their advice to those in the HDD market and those considering entering it.

1. Buy the right equipment. HDD is highly specialized and your dealer can help you select the right equipment for the jobs you&#;ll be doing, starting with the right size HDD rig. Undersized machines will lack the necessary power. Oversized machines will have too big a footprint and too shallow a bend radius of the drill rods. &#;Models often seem very similar, but small differences do matter,&#; says Maker.
2. Identify the support organizations that help ensure success. This includes dealers and suppliers to provide the parts and service needed to avoid downtime. Put emphasis on training. HDD procedures and equipment are involved, specific and exacting; skills learned on other equipment in other applications don&#;t always transfer well. And although there&#;s a lot of information available from multiple sources, including online and in person, those are not all reliable. &#;Peer-to-peer information exchange can reinforce bad information,&#; says Vroom. &#;It is not a substitute for formal, structured training.&#; Dealers help with training; some vocational and technical colleges are launching HDD courses, as well.
3. Understand your market. You can only invest in the right equipment if you know the jobs that your equipment will be doing. Recognize that markets change. &#;Long-line fiber drove the market at one time,&#; says Levings. &#;North American sales went from 100 to 200 units per year in the mid-&#;90s to some 4,000 units in . Then the fiber bust of collapsed the market and contractors had to scramble to find other HDD work.&#;

All three points fit into Levings&#; advice: &#;Develop a plan and stick to it. Doing so will maximize production, reduce costs and thereby enhance profitability.&#;

The cost of a utility strike can be catastrophic to an HDD contractor, so Maker offers this final caveat: &#;Preventing damage to utilities and infrastructure is critical. Underground environments are crowded in many places. You need a complete and accurate map of underground infrastructure and the equipment and skill to navigate your drill string through that environment.&#;

Products Featured in this Article:

View Video Highlights from our Show:

Join thousands of industry peers who receive utility construction industry news and trends each week. Subscribe to The Utility Expo Newsletter. 

If you want to learn more, please visit our website Surface Mining Drill Rigs.