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Home > DST TOOLS
Tubing String Testing (TST) Valve
Tubing String Testing (TST) Valve

Tubing String Testing (TST) Valve

The tubing string testing valve - TST valve is designed in full-opening and operated by annulus pressure in the hole.  the TST valve is used to pressure-test the work string during running in the hole. The TST valve is operated after it is stung into a pe
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Description

Introudction 

 

The tubing string testing valve - TST valve is designed in full-opening and operated by annulus pressure in the hole.  the TST valve is used to pressure-test the work string during running in the hole. The TST valve is operated after it is stung into a permanent packer or a retrievable packer is set.

The TST valve requires a differential pressure between the annulus and the tubing to shear. The TST valve can also be applied for pip flexing if it is run below an annulus pressure-responsive circulating valve.

 

Structure of the Tubing String Testing Valve

 

* Flapper valve and spring.

* Locking dogs

* Shear pin section

 

Operation of the TST Valve

 

When the tubing string testing flapper valve opens, it allows the workstring to fill up. The shear pins hold the mandrel in place. The workstring can be pressure-tested as many times as required as it is run in the well. After string testing finished, increasing annulus pressure made the flapper valve open, also can process closing well operation for tester valve (pressure-responsive valve).

 

Application of Tubing String Testing Valve

 

* Cased hole drill stem testing operation.

* Oil well flow operations

 

 

Features and Benefits of Tubing String Testing Valve

 

* It only need 4psi to open the flapper valve.

* The testing string can be pressure-tested as many times as required as it is in the hole.

* Valve shear rating can be pre-determined at 500psi increments.

* Valve can also be used for pipe flexing.

 

 

Technical parameter 

 

No Specification 5”
1 O.D. 127.5mm
2 Bore Diameter 57mm
3 Length 1333mm
4 Flapper valve diff. pressure 70Mpa
5 Working pressure 105Mpa
6 Internal pressure strength 129Mpa
7 External pressure strength 120Mpa
8 Tensile strength 1320KN
9 Torque strength 23KN.m
10 Shear pin valve 3.5Mpa/pc
11 Service H2S,NACE MR0175(>175oF)
12 Working temperature -29oC+204oC
13 Connection thread 3 7/8CAS. BXP or 3 1/2 IF.BXP

table2
No Specification 5”
1 O.D. 127.5mm
2 Bore Diameter 57mm
3 Length 1333mm
4 Flapper valve diff. pressure 70Mpa
5 Working pressure 105Mpa
6 Internal pressure strength 129Mpa
7 External pressure strength 120Mpa
8 Tensile strength 1320KN
9 Torque strength 23KN.m
10 Shear pin valve 3.5Mpa/pc
11 Service H2S,NACE MR0175(>175oF)
12 Working temperature -29oC+204oC
13 Connection thread 3 7/8CAS. BXP or 3 1/2 IF.BXP
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