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.

Contact us to discuss your requirements of Slant Rig. Our experienced sales team can help you identify the options that best suit your needs.

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.

For more information, please visit Annular BOP Manufacturer | HRSB.

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.

By: Trevor Crone

@RZOffshoreGuy sheds some light on one of the great mysteries of the oilfield.

Currently, it&#;s nearly impossible to open an industry publication and not find horizontal or directional drilling referenced. And for good reason. Those wells are arguable the main component that made the U.S. shale revolution possible. Fracking gets all the headlines as the technology that allowed the extraction of shale oil and gas but without the long laterals of horizontal wells there wouldn&#;t be enough exposed pay zone to frack in the first place. And, frankly, what&#;s more impressive? Being able to bust open some rock or accurately drill a 20,000-foot well 90 degrees from vertical? Settle down frac hands, I&#;m being sarcastic &#; sort of.

We&#;ve known for a while about the large quantities of oil and gas trapped in shale plays like the Eagle Ford in Texas and Bakken in North Dakota. The problem is that the pore spaces in tight shale formations prevent economically attractive amounts of oil and gas from flowing freely into a conventional wellbore. Vertical wells only expose the portion of the shale formation that is directly below the bit. That&#;s fine if you&#;re drilling through several hundred feet of pay zone, but it is less than ideal if your target is only 20 feet thick. What if you could drill inside instead of through that formation?

I&#;m not sure when I was first made aware of the terms directional or horizontal drilling but I have to assume it was in the early 90s when I was in high school. I remember having a vague understanding of what it was but absolutely zero understanding of how it was accomplished. If you&#;re reading this, you&#;re probably in the same position. About 10 years later, I laid eyes on my first directional bottomhole assembly and it all started to make sense. Directional drilling technology has evolved quite a bit and become very sophisticated over the years but the basic idea is still the same: orient the bit in the direction you want it to go.

In the time I spent working offshore, every directional well I was involved with was drilled using mud motors. Without getting overly technical, a mud motor is a downhole tool similar in size to a drill collar and contains a positive displacement pump (PDP) that is powered by drilling fluid being pumped down the drill string. The PDP is used to rotate the bit independently of the drill string.

Mud motors used in directional drilling are fabricated with a slight bend that can range up to about 4 degrees. The vertical portion of the well is drilled normally with the entire drill string rotating. When the operator decides they&#;re ready to go directional, drilling stops and the directional driller orients the drill string so that the bend in the mud motor points in the direction that everyone thinks the well should go. At that point, the PDP is engaged and only the bit rotates. As weight is applied, the bit begins to chew through the formation and the hole that&#;s made corresponds to the degree of bend built into the mud motor. When the appropriate hole angle is built, the PDP is dis-engaged and conventional drilling resumes on the new trajectory. This type of drilling is called &#;sliding&#; because the drill string is literally sliding along the well bore because the bit is the only thing that rotates.

Sliding can be slow and creates a lot of drag which causes problems when you start drilling long horizontal wells. A lot of friction has to be overcome as gravity pulls the drill string to the bottom of the well bore. To combat this, the ingenious men and women of the oil and gas industry invented various Rotary Steerable Systems (RSS). RSS provides the advantage of controlling the direction of the bit while simultaneously rotating the drill string. I&#;m not going to get into the reasons why but just know that keeping the drill string rotating while you&#;re drilling helps keep a lot of downhole demons at bay.

RSS centers around 2 different technologies known as push-the-bit and point-the-bit. Push-the-bit technology controls the path of the well by physically pushing the bit against the side of the well bore. This is done using a series of moveable metal pads built into a non-rotating portion of the downhole steering tool. The bit can be guided in any direction by pushing 1 or more of the pads against the opposite side of the well bore. When the pads aren&#;t busy guiding the bit, they act as stabilizers to keep the bit centered.

Point-the-bit technology is a little more difficult to explain so you&#;re going to have to use your imagination. In point-the-bit systems, the bit is attached to a flexible shaft that extends through the tool body. Different companies go about this in slightly different ways but all involve the deflection of the shaft. One company uses a series of eccentric rings to deflect the shaft while another uses a set of pistons to push the shaft. Regardless of how it&#;s done, the end result is a bit that is always pointing at the targets that the geologists and petroleum engineers identified.

As effective as point-the-bit and push-the-bit systems are, they&#;re useless without reliable electronics to control the downhole tools and reliable telemetry to know exactly where the bit is and what direction it&#;s going in at all times. The success of RSS is a result of years of effort across many different disciplines within the industry and allowed hundreds of thousands of feet of oil and gas-bearing shale to be exposed by extended reach horizontal wells. Which, in turn, allowed the fracking companies to swoop in and soak up all the attention. Well done frac hands!

I left out a lot of details for the sake of time and maintaining interest level. If you&#;ve got questions on this or anything else oilfield-related, you can hit me up on Twitter @RZOffshoreGuy or leave a comment below. Also, Rigzone&#;s How it Works section may be able to answer some questions so give it a click.

Sources: Schlumberger, Halliburton, Weatherford

If you want to learn more, please visit our website Ram BOP | HRSB.