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Engineers are continually challenged with the risk of hole collapse when faced with drilling through overburden and unconsolidated formations. That is why it is prudent to use drilling casings to drill through overburden while advancing the drilling casing and protecting the hole at the same time.
The aim of this blog is to tell you everything you need to know about this ingenious product so you can make an informed decision as to whether it is the right solution for your drilling program.
After reading our guide, you will have an understanding of what casing advancement systems are, when and where to use them and which casing advancement systems are suitable for your project.
A drilling casing is a type of drilling tool that enables you to case and drill simultaneously. It can be used with rotary percussion drilling where the impact of the hammer drives the casing down the wellbore.
Installing casing, while drilling, minimizes the risk of holes collapsing and enables projects to be completed faster and more efficiently. For this reason, casing advancement systems add value whether installing foundations, support elements, or casing a hole in formations where hole collapse is possible.
Casing advancement systems, or drilled casings, are used when ground conditions make it difficult to drill, such as in loose formations or drilling through highly fractured rock.
Ninety percent of the earths ground conditions are loose, unconsolidated, and rocky. Drilling in these formations is often challenging and the risk of collapsing, hole deviation, and failure to reach the intended depth is a real concern for drilling contractors.
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Installing drilling casing as the hole is drilled helps to stabilize loose, or unpredictable formations, and shore up the hole. This is particularly the case when penetrating clay, silt, sand, gravel, cobbles, boulders, and fractured rock.
Casing and drilling simultaneously improve drilling efficiency. If you need to speed up drilling time, adding a casing advancement system to your drilling toolbox will go a long way to improving productivity and the drill time on your project.
Selecting the right system will depend on the drilling application or purpose. There are several factors to consider: the ground formation and type, the drilling method, whether a permanent or retrievable casing is required, the outside diameter of the casing, the wall thickness, the ring bit ID, as well as the casing and rock socket depth. Armed with this knowledge, we can then specify the appropriate system.
Below are examples of the most common applications:
The use of geothermal heating in houses has become increasingly popular as it provides both economical and environmental advantages for the user.
Casing advancement systems are useful when drilling a geothermal well as they keep the hole open during installation of the heat exchange system and minimizes any impact on the surrounding structures. It also prevents the collapse of the well during drilling where ground conditions are unstable.
Water well drilling is commonly done in urban areas where drilling at speed is necessary to minimize disruptions to residents, as well as in the developed area where drilling is taking place.
In this step of well life cycle load simulation, the devil lies in the details. For drilling engineer it is very important to understand each input data and how it can pass or fail a casing string. For a base case stick to your companys well engineering manual (WEMS) for relevant inputs on each casing string from conductor all the way to production casing. For example ensure that you consciously understand why a level drop load is used for collapse design and how much level would drop and its reason ( fractured formation below shoe, depleted one, faults etc) Without going in details in casing design loads input, casing string can be easily pass on fail in early stage and that can misguide the project team on critical lead item.
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