After installation of the completion string, we can run, locate & lock a wireline retrievable subsurface safety valve WRSV into a safety valve landing nipple (SVLN) before production. The SVLN (valve nipple) is integral to the tubing string. The valves typically open due to the hydraulic pressure acting on a piston which moves a flow …
A subsurface safety valve (SSSV) is a downhole safety device installed in a well that can be closed in emergencies. An emergency may arise on or around a well from equipment failure, human error, collision with an offshore facility by a third-party vessel, fire, leaks, or sabotage. Why Do We Need Subsurface Safety Valves? The …
There are two basic types of well completions techniques: There is also another classification for well completion depending on the well Production Mode. This classification shall include the following: Open Hole Well Completion Type The open hole completion has the production casing set above the target intervals. We complete such a well with the producing …
A multiple completion is one where we can produce several different reservoir zones through separate flow paths within the same wellbore. As we shall see, we may accomplish this with tubing/annulus flow, multiple tubing strings, or by cementing several independent tubing strings in the same wellbore (a multiple tubingless completion). Reasons For Multiple Completions A …
Flowing wells equipped with a single tubing string are usually completed with a packer. Single-zone completions may involve the downhole commingling of production from several intervals within that zone. Examples of single-zone completions are shown in Figure 1. At the design stage, optimum tubing size for maximum long-term flow rate, future artificial lift needs, and …
The casing is placed in the open hole completion type and cemented above the productive interval(s). Further drilling extends the well bore into and/or through the reservoir(s) left uncased, hence the term ‘Open Hole’; See Figure below. All open-hole completions avoid the cost and complexity of perforating but have their complications. Advantages This type of …
Sliding sleeves – sometimes called sliding side doors (SSDs) – are manipulated by wireline locks and use nipple profiles. The figure below shows a typical siding sleeve. This sleeve uses a collet to ‘hold’ the sleeve in one of three positions (open, equalizing, and closed). Sliding sleeves have earned a poor reputation – they either …
Bridge plugs are specialty plugging devices that can be set as temporary isolation tools to be retrieved (retrievable) later or installed as permanent plugging and isolation tools (Drillable). They can be run on a wireline or pipes designed to be set in either casing or tubing. Also, models are available that are set in the …
A packer is a tool used in oil and gas production well, which when set, seals the annular space between 2 strings of pipe or a string of pipe and the open hole. They also must have the capability of permitting production flow through them and onto the surface. As its major functions, a packer …
The variety of methods & procedures available for providing the setting mechanism for the seal elements of a packer leads to a significant number of options for installing and completing a well. Consider firstly therefore the setting methods for wells packers. Each of the possible methods for setting a packer is outlined below: Packer Setting …
