Well Integrity Technical Section

Forum.

I am looking to find some recommendations, best practises or even rules for the maximum setting angle of a TRSV flapper valve within a well.

Is there an industry standard or a vendor recommendation that would state not to set a TRSV in a well at 65deg or more for example?

I’m not concerned about the wireline access for setting lock out sleeves or WRSVs this can be overcome, I’m more interested in the ability of the flapper to close and most importantly seal when required due to gravity and debris or even both.

Thanks in advance for your thoughts and comments.

Regards

Ken Horne............

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Ken Horne
Independent Consultant
Multilateral Solutions
Aberdeen
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TRSV test have been / are conducted horizontal not aware of any rule other then TVD hydraulics pressures need to be considered versus AHD, any one else ?

To my knowledge there is no restriction valve will perform in any position, also don't forget when flapper is exposed to flow when closing, flow will assist to close flapper ( slam shut ) .

regards Paul

------Original Message------

Forum.

I am looking to find some recommendations, best practises or even rules for the maximum setting angle of a TRSV flapper valve within a well.

Is there an industry standard or a vendor recommendation that would state not to set a TRSV in a well at 65deg or more for example?

I’m not concerned about the wireline access for setting lock out sleeves or WRSVs this can be overcome, I’m more interested in the ability of the flapper to close and most importantly seal when required due to gravity and debris or even both.

Thanks in advance for your thoughts and comments.

Regards

Ken Horne............

------------------------------
Ken Horne
Independent Consultant
Multilateral Solutions
Aberdeen
------------------------------

Hi Paul.

I've since been informed that API 14A Functional and Verification Tests are specified as being vertical in the standard.  If they are tested horizontally this would be by customer special order and I suspect carried out after the API tests. 

But as we all know we can test all we like and usually get perfect tests on new equipment.  I'm more interested in the functionality of a horizontal valve after several years in the well exposed to sand and scale.

There are  wells that need artificially lifted such as with an ESP pump and the well doesn't flow on its own.  Quite the reverse in fact as the wells in some cases are sub hydrostatic, if the ESP pump is switched off, the fluids drain back to the reservoir through the effectively closed flapper.

So my question is in relation to older low pressure wells where you have no control; over the orientation of the flapper when the valve is deployed and the flow rate even when flowing may well be so low that there is sand and or other debris deposits on the low side of the hole.  In this event the flapper only needs to be held slightly off its seat and it wont seal.

Granted the flow tube by design will usually be covering the seal face to prevent debris from getting to the seat.

Thanks for your thoughts Paul.

It would be good to get some feed back from the suppliers/manufacturers on this.

Regards

Ken

------------------------------
Ken Horne
Independent Consultant
Multilateral Solutions
Aberdeen

Original Message:
Sent: Feb 07,2016 09:14 AM
From: Paul Hopmans
Subject: Maximum hole angle to set a TRSSSV at?

TRSV test have been / are conducted horizontal not aware of any rule other then TVD hydraulics pressures need to be considered versus AHD, any one else ?

To my knowledge there is no restriction valve will perform in any position, also don't forget when flapper is exposed to flow when closing, flow will assist to close flapper ( slam shut ) .

regards Paul

Ken , yes you are correct with respect to test requirements from API, in event of scale debris build up risk it is advisable to cycle the valve on regular basis to keep the flow tube clean and prevent it getting stuck, in some cases this is done on a monthly routine, i would be less worried about the flapper or seat as they are protected by the flow tube.

regards Paul

------Original Message------

Hi Paul.

I've since been informed that API 14A Functional and Verification Tests are specified as being vertical in the standard.  If they are tested horizontally this would be by customer special order and I suspect carried out after the API tests. 

But as we all know we can test all we like and usually get perfect tests on new equipment.  I'm more interested in the functionality of a horizontal valve after several years in the well exposed to sand and scale.

There are  wells that need artificially lifted such as with an ESP pump and the well doesn't flow on its own.  Quite the reverse in fact as the wells in some cases are sub hydrostatic, if the ESP pump is switched off, the fluids drain back to the reservoir through the effectively closed flapper.

So my question is in relation to older low pressure wells where you have no control; over the orientation of the flapper when the valve is deployed and the flow rate even when flowing may well be so low that there is sand and or other debris deposits on the low side of the hole.  In this event the flapper only needs to be held slightly off its seat and it wont seal.

Granted the flow tube by design will usually be covering the seal face to prevent debris from getting to the seat.

Thanks for your thoughts Paul.

It would be good to get some feed back from the suppliers/manufacturers on this.

Regards

Ken

------------------------------
Ken Horne
Independent Consultant
Multilateral Solutions
Aberdeen
------------------------------