Wireline Retrievable Subsurface Safety Valve - DRILLING MANUAL | #drilling_manual
In this article, we will discuss the Wireline Retrievable Subsurface Safety Valve (WRSV) and its installation process. We will explore the advantages and disadvantages of using this valve, as well as the required tools for its installation. Additionally, we will cover the landing nipple for the WRSV, control lines, lock mandrel, and other wireline installation and retrieval tools for safety valves.
The WRSV is a safety valve that can be installed into a safety valve landing nipple (SVLN) before production. It operates by hydraulic pressure acting on a piston, which moves a flow tube to open the valve. When pressure is released, a spring ensures the reverse movement of the piston and flow tube, allowing for valve closure. One advantage of the WRSV is its internal equalizing capabilities, which allow for easy retrieval and repair if the equalizing area is flow cut. These valves can be installed in various configurations, and their installation and removal processes are simple and efficient. However, one disadvantage is the direct contact between control line fluid and contaminating fluids in the tubing during installation, which means there will be no downhole safety valve in the well until the installation is complete. Another drawback is that the installation of the WRSV can restrict the inside diameter of the tubing and affect production rates.
To install a WRSV, several tools and components are required. These include the WRSV itself, a lock mandrel, hydraulic control line and fittings, a hydraulic control manifold, wireline installation and retrieval tools, and a well completion design book. The lock mandrel is a removable locking device used to locate, lock, and seal off the WRSV within the SVLN. It is attached to the lower end of the lock mandrel, making up the subsurface safety valve assembly. Control lines are attached to the SVLN and tubing hanger using compression fittings, and they allow for the operation of the valve through the control fluid.
In conclusion, the Wireline Retrievable Subsurface Safety Valve is a valuable tool for ensuring safety in drilling operations. Its installation process, although requiring specific tools, is relatively straightforward. However, it is essential to consider the potential disadvantages of using this valve, such as the temporary absence of a downhole safety valve during installation and the potential impact on production rates. By understanding the features and requirements of the WRSV, drillers can make informed decisions regarding the installation and maintenance of these valves in their drilling operations.
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