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 …
A sliding sleeve is a completion valve that opens or closes ports between the tubing bore and the surrounding annulus. Often called a sliding side door (SSD), it can provide a circulation path or control access to an isolated producing interval. In a conventional circulation sleeve, closing the side ports does not close the main …
A bridge plug is a downhole isolation device that closes the bore at a selected depth, separating the well above it from the interval below. Conventional designs combine an anchoring system, sealing element and internal closure. The main removal options are drillable and retrievable; through-tubing describes how a tool reaches its setting location, not a …
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 …
A retrievable packer Can be defined as a subsurface tool that runs as a part of the completion string to provide a seal between the casing and tubing and can also be set and retrieved with wireline, mechanical or hydraulic mechanism. The major difference than other types of packers (permanent packers) is that they can …
Types of packers used in oil and gas completions are commonly grouped by retrievability—permanent or retrievable—and by setting method, including mechanical, hydraulic and hydrostatic systems. These classifications overlap: a hydraulic-set packer may be permanent or retrievable. Wireline describes a way of conveying and operating a setting assembly, not whether the packer can later be removed. …
A polished bore receptacle (PBR) is another class of wells packers category that can be utilized in place of a permanent packer. The PBR accepts an inner seal assembly that provides a seal off between the tubing and the PBR Figure (1) and (2). The Polished Bore Receptacle is generally employed in a casing liner …
Factors to be considered Well conditions. Compatibility with other downhole equipment. Customer preference. It must be recognized that oftentimes, several different types of packers may be successfully used in the same installation. Many times, a packer may be selected by the operator because he has experienced good success using it in the past. Economics. Economics …
Permanent packers as the name implies are well packers, when set, cannot be retrieved from the well. General characteristics common to permanent packers include: Components of Permanent Packers: Typically, They will have specific components according to their manufacturer and their design, but most of the time you shall find certain items in each permanent packer …