In case of a drill string failure, such as pipe washout or twist-off, it is crucial to determine the cause of the failure to prevent it from happening again. This text covers the most common failure mechanisms, of which there are over a dozen, and provides a general understanding of what to do in each …
Guns normally run on wireline or tubing can also be run using coiled tubing allowing through tubing perforating to be carried out in horizontal wells. An electrical wireline can be installed inside the coiled tubing to allow depth correlation with casing collars or a gamma ray and the use of electrically initiated detonators. Here, we …
A wiper trip is often made before running the casing. This is because it is essential that the casing, once started in the hole, reaches the planned casing setting depth with minimal trouble. Therefore, the hole must be in the best possible condition before running the casing. Procedure On the last trip out of the …
Hydrostatic pressure in oilfield drilling is the pressure that a fluid exerts due to the weight of the fluid column above it. This pressure varies with the depth and density of the fluid. It’s present at all points below the fluid surface, regardless of whether the fluid is a liquid or a gas. For instance, …
Mudline Suspension Systems (MLS) are commonly used for jack-up and platform drilling, where the elevation of the drill floor above the sea bed would impose unacceptable buckling forces on the unsupported casing type above the sea bed if the weight of the casing pipes were supported by a surface wellhead. MLS allows hanging off the …
The Dump Bailer is a tool that we can run on a wireline. It facilitates placing the required cement on top of a bridge plug. The release of a weight bar displaces cement from the bailer sections. The plug can undergo a pressure test 24 hours after the last bailer run, when the cement has …
Thru tubing perforating guns is a technique dating from the 1950s. Using a seal around the cable at the surface allows perforating of hydrocarbon wells while there is pressure at the surface. This enables perforation of the well without excessive hydrostatic pressure caused by drilling or workover fluids. Please note that this type is different …
In this section, you can find a free 2024 oilfield calendar to print in a monthly format (one or more months for each page). All calendars are available in PDF format, can be downloaded for free, printed in A4 page format, or in the larger and more readable A3 format. Some oilfield calendars show the numbers of the weeks. …
Hollow carrier casing guns are the direct descendants of the original perforating guns that have been in use since the 1930s. These guns are available in diameters from 86 mm (3 3/8″) to 184 mm (7 1/4″). Furthermore, they can contain up to 46 shots per meter (14 shots per foot). Large-diameter steel carrier casing …
In 1932, the first bullet perforation gun was developed. This gun created a flow path from the formation into the casing by firing a projectile (bullet) through the cement and casing. It was known for providing a very uniform hole in the casing. However, as well depths required higher strength casing, it became less effective. …