What is Tubing-retrievable Subsurface Safety Valve (TRSSSV)

A tubing-retrievable subsurface safety valve (TRSSSV) is run as an integral part of the completion string. The equipment requirements for the oil and gas TRSV system are: the TRSV assembly, hydraulic control line and fittings, and a hydraulic control manifold. Like the wireline retrievable safety valve WRSV, the control line is attached between the TRSV and the tubing hanger.

When running a TRSV, hydraulic pressure is applied to the control line holding the valve open to prevent pressure locking when the tubing string engages a packer or liner hanger. The valve of this hold-open pressure is provided in the manufacturer's design and test pressures.

Application of TRSSSV

It is advisable to avoid restricting the through diameter in wells with substantial production rates. Additionally, for gas wells especially, this restriction near the surface coincides with a zone where pressure and temperature conditions may favor hydrate formation. Therefore, this type of oil and gas well is preferably equipped with TRSV safety valves that provide an inside through diameter the same as that of the tubing. The production string must, however, be pulled out to change the valve. The valve is usually associated with a tubing anchor and a disconnection system that allows only the upper part of the tubing and the valve to be pulled out.

In the second case, a landing nipple machined in the valve body may allow a wireline retrievable valve to be inserted and controlled by the same hydraulic line. This makes it possible to keep well in safe conditions while waiting for a workover operation if a tubing retrievable valve (TRSSSV) has failed. In subsea completions, two tandem valves can be run together, each operated independently of the other.

Most modern completions use tubing retrievable safety valves, except where conditions and rates are benign. These valves are more reliable than wireline retrievable versions, provide fewer restrictions, and do not need to be pulled for every well intervention.

Alternately, on easily accessible land wells where servicing and workover methods are relatively much less costly, servicing can be conducted almost on demand. This may lead to selecting a wireline retrievable type safety valve rather than a tubing retrievable type (TRSSSV), as in the event of failure; the valve can be replaced cheaply without requiring a workover.

Some older designs of TRSCSSSV use ball valves instead of flappers. However, the simplicity of flapper systems means that ball valve designs are now rare (they are still used in deployment valves where being able to pressure test from above is helpful). We can pump through almost all flapper valves, which is useful if the valve fails and requires a hydraulic kill.

As an in-depth participant in the oil and gas industry, Vigor's team has many years of product knowledge and field experience, and the following are the detailed parameter requirements for TRSSSV from the field for reference:

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