What is monobore completion?
A monobore completion is a simple completion design that uses the same internal diameter from the bottom of the well to surface. This may be accomplished by cementing a string of casing in a well, or by having tubing stabbed into a polished bore receptacle on a casing liner the same size as the tubing.
What is a Monobore?
“Monobore” describes A well where the diameter of the production conduit is uniform from the reservoir to surface. The simplest form of monobore is a string of tubing cemented in place that eliminates the need for one casing string or liner when compared with a conventional well design (Figure 1).
What is cemented monobore?
Monobore cementation is defined as where a single production tubing size runs from the pay zone all the way to surface and is cemented in place. This type of well design greatly reduce rig time and cost.
What is a monobore completion?
Wells with a single production tubing size from the pay zone all the way to the surface of the completion are categorized as a “monobore” completion. Although there are certain limitations to this type of completion, there are also many advantages, including drilling cost and a reduced equipment list (packers, sliding sleeves, etc).
What are the advantages of the monobore design?
The advantages of the monobore design over conventional designs include: For the same size of surface casing strings, the monobore design allows a larger production conduit than a conventional well without having to utilise underreaming, bi-centre bits or expandable tubulars, for example.
Are monobore systems a viable option for completing oil wells?
Many wells are not feasible using more traditional completion techniques. But with monobore systems that can reduce rig time and cost while still safely completing the well, these wells can move from the category of unfeasible or marginal to profitable or, in some cases, highly profitable.
Why cement through the tubing string of a monobore well?
The ability to cement through the tubing string of a true monobore completion can serve as a method to preserve the integrity of the well tubulars but also reduce the amount of rig time required to complete these wells by as many as four days.