A landing nipple is a completion-tubing component with a machined locking profile and sealbore for a compatible lock mandrel and downhole device. Selective systems allow a chosen landing location; no-go systems use a locating shoulder. The nipple provides the receptacle, but the installed plug, valve or instrument assembly determines the function. This guide explains landing-nipple …
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 …
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 …
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. …
Wireline conveyed perforating is an established, proven technique of unquestionable reliability. It is often the cheapest perforating method technique and more reliable than the alternatives. The consequences of a misfire are minimized by the ease with which guns can be pulled from the hole and re-run. Due to the gun’s weight, only a limited interval …
The shaped charge was a development for armour piercing shells in the Second World War. It creates a very high pressure, but a highly focussed jet that is designed to penetrate the casing pipe, the cement and, as far as possible, into the formation. The components of the shaped charge used in oil well perforating, …
After successfully perforating using wireline guns, experts proposed that they could run similar guns on pipes. This allowed for longer sections of the gun to be utilized, reducing the rig time required for well completion. Further time savings could be achieved by combining the guns with the completion string. In the 1930s, Halliburton patented the …
We use several methods to create a hole from the wellbore through the casing and any cement sheath into the producing zone, such as shaped perforating charges, bullet guns, and abrasive jets. These methods are called perforating methods. Perforations create conduits into the reservoir that allow hydrocarbon recovery and influence it. Different perforating requirements are …
This is the more widely employed and reliable method. The design of SCSSV – surface control subsurface safety valve is typically aiming to operate independently of well conditions. This is because the downhole valve relies on hydraulic pressure. The pressure is supplied by a small 1/4″ monel control line strapped to the tubing to keep …