SUBSURFACE SAFETY VALVE (SSSV)

The tubing-retrievable subsurface safety valve (SSSV) provides well protection against pressure drop and system failure in wireline and thru-tubing operations. This retrievable safety valve is controlled from the surface with a hydraulic control line. The valve connects to the tubing string and remains open if adequate pressure is maintained. If pressure drops below the threshold (as occurs in the beginning stages of losing well control), the valve closes. This creates a barrier in the tubing to prevent fluids from rushing up the tubing.

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The tubing-retrievable SSSV uses a fail-safe design to prevent the release of unwanted fluids during well completion. This is a critical HSE and well-control requirement on all wells capable of natural flow.

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Underwater Safety Valve

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Underwater Safety Valve

Underwater Safety Valve

booob630

(Mechanical)

(OP)

29 Mar 20 07:08

I would like to learn what's difference on underwater safety valve (USV), surface safety valve (SSV), sub-surface safety valve (SSSV) and subsea valve. I am working on a design for underwater safety valve to follow up API 6A application, how to set up the depth of water? if the all calculation will be same as surface safety valve (SSV)?

Any assistance would be appreciated.

Thanks in advance.

RE: Underwater Safety Valve

MortenA

(Petroleum)

29 Mar 20 20:09

Ssv and sssv are in the Well and subsea is in a pipeline. I have not heard about USV before

RE: Underwater Safety Valve

SJones

(Petroleum)

30 Mar 20 09:24

USV/SSV is defined in Spec 6A and Spec 6AV1. SSSV is defined in Spec 14A.

Steve Jones
Corrosion Management Consultant

www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

RE: Underwater Safety Valve

LittleInch

(Petroleum)

30 Mar 20 12:36

SSV is Surface safety Valve which if the tree is underwater could also be called an USV.

SSSV is also known as "downhole safety" and is inside the well bore itself. So it doesn't care whether the well is above or below sea level

Subsea valve is just any valve which is below sea level.

How to set up depth of water - Up to you. Where is the valve going to be in the world? Which markets do you want to supply. Some areas are relatively shallow (<100m) some up to commonly 3-400m and some up to 2000m.

API 6A seems to have made a distinction between a wellhead safety valve above water (SSV) and one on a well below water (USV). But they do the same job. Many calculations will be the same.

I hadn't come accross the term USV before but as always S Jones is correct - it's defined in 6A, often as SSV/USV.SSV is Surface safety Valve which if the tree is underwater could also be called an USV.SSSV is also known as "downhole safety" and is inside the well bore itself. So it doesn't care whether the well is above or below sea levelSubsea valve is just any valve which is below sea level.How to set up depth of water - Up to you. Where is the valve going to be in the world? Which markets do you want to supply. Some areas are relatively shallow (<100m) some up to commonly 3-400m and some up to 2000m.API 6A seems to have made a distinction between a wellhead safety valve above water (SSV) and one on a well below water (USV). But they do the same job. Many calculations will be the same.

Remember - More details = better answers
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RE: Underwater Safety Valve

booob630

(Mechanical)

(OP)

2 Apr 20 12:43

Thank you very much LittleInch.

If I consider this USV will working under a shallow (<100m), if I need to calculate the external water pressure? In the addition if a hydraulic actuator is available?

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