![]() Horizontal directional drilling is a trenchless method of installing a pipeline underground below identified features (obstacles) without disruption to any of the identified features. Horizontal Directional Drilling application has expanded to cover shore crossing for pipeline transiting from offshore to onshore. Horizontal directional drilling (HDD) is one of the most suitable means of crossing such obstacles. Therefore, it is imperative to select an appropriate crossing method during the design phase of the project. They require special crossing technology when an open cut cannot be performed. These obstacles include roads, railways, water bodies, sensitive areas, buried pipelines, and cables. Various features (obstacles) are encountered during pipeline installation. 7 PROJECT EXPERIENCE: pipeline bundle installationįigure 1: Horizontal Drilling Machine 2 INTRODUCTION to Horizontal Directional Drilling.6.4 Pipe Pullback (Pipeline Installation).6 HOW DOES HORIZONTAL DIRECTIONAL DRILLING WORKS.5 Horizontal Directional Drilling: INSPECTION AND TESTING.4.1.2 Surface and Topographical Surface. ![]() 4 Horizontal Directional Drilling: PREDESIGN AND DESIGN ACTIVITIES.3 TERMS USED IN HORIZONTAL DIRECTIONAL DRILLING.2 INTRODUCTION to Horizontal Directional Drilling.1 OVERVIEW: Horizontal Directional Drilling.Gone are the days of only being able to drill in a vertical direction-horizontal and slant drilling have changed the game! They’ve enabled us to source oil and gas that years and years ago would have been near on impossible. While it may cost a lot more, it has a greater production rate and increases efficiency by heaps. Nowadays it appears many companies are choosing to drill horizontally over anything else. This is pretty impressive when you compare it to the vertical method that has to be around 2000 metres deep before it can even attempt it! Horizontal drilling has the ability to do a 90-degree turn just a couple of metres deep into the ground. Other than the fact that horizontal and vertical drilling change direction at different angles there are still a couple more differences that we should probably address. It’s used mainly for non-vertical wells and extracting gas or oil that the horizontal drill method can’t reach. There is a definite change in direction right? A slanted rig is designed to function at a particular angle, rotating whilst sustaining drilling loads. Again, check out this super cool diagram that explains it as clear as day. The angle tends to vary between 30 degrees to 45 degrees. You guessed it, the angle of the drill is on a slant! It’s not as obvious as the “J” bend, but it’s a lot more obvious than a straight and narrow vertical drill. Can you see the “J” I’m talking about? Image Credit: What Is Slanted Drilling? The well to the left is the horizontal drill, and the one on the right is the vertical drill. Confused? Check out this diagram that actually made it a lot clearer in my mind. This means we can access all the gas or oil in the surrounding areas, whereas a vertical drill can only access where the end of the well touches. (Hence, directional drilling?!) Consequently, it resembles a letter “J”. Now, because the horizontal section of the well is really really deep, it has to have a vertical part to it. Horizontal drilling is the process where the well is turned horizontally at a certain depth. It’s only around 4 inches in diameter too, so it’s pretty bendy! What Is Horizontal Drilling? The reason this is possible is because the steel pipe used in the process is so flexible even thousands of feet deep into the ground. This means they are ways of intervening the natural path a wellbore would normally take. (The clue is in their names right?) So they are both different techniques for finding oil, natural gas, or whatever you need extract from the deep depths of the earth.įact: Whether we drill slanted and horizontally, they are both methods of deviated drilling. Both of which are types of directional drilling. There is also the method of slant drilling. Wait, we don’t just drill in one straight line into the ground? Nope, and there are different ways to do it too. The term “directional boring” is commonly called horizontal drilling. Hold the applause…ĭrilling for oil is boring. This is not a drill, I repeat this is not a drill! Your burning questions about slant and horizontal drilling are about to be answered.
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