Rupture Disk (RD) Tubing String Testing (TST) Valve

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Description

Introudction of Tubing String Tester Valve

The tubing string tester valve is short of TST valve as the part of Drill stem testing working string. The tubing string tester is designed of with a full-opening and used to pressure-test the workstring while running in the hole. The tubing string tester valve is operated after it is stung into a permanent packer or a retrievable packer is set. The tubing string tester valve is applied in cased hole drill stem testing operation and oil well flow operations. The tester valve is consist of flapper valve and spring, locking dogs

and Shear pin section

Features of Tubing String Tester Valve

* The flapper valve required only need 4psi to be openned .

* The testing string can be pressure-tested many times .

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

* The tubing tester Valve can also be used for pipe flexing.

Operation of the TST Valve

When the tubing string testing valve run in the hole, flapper valve keeps open, 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 when the tubing string tester valve is run in the well.

The tubing string tester valve requires the differential pressure between the annulus and the tubing to shear. After string testing finished,the flapper valve is opened by increasing annulus pressure, also can process closing well operation for tester valve. The tubing string tester valve is applied in cased hole drill stem testing operation and oil well flow operations.

Specification of Tubing String Tester Valve

Tool Size /in	OD /in	ID /in	Thread Connections	Length / in	Working Pressure
3 7/8	3.9	1.8	2 7/8 CAS	44.67	15,000 psi
5	5.03	2.28	3 7/8 CAS	48	15,000 psi

table 2

No	Specification	5” RD Circulating valve
1	O.D.	127.5mm
2	Bore Diameter	57mm
3	Length	1220mm
4	Working pressure	105Mpa
5	Internal pressure strength	139Mpa
6	External pressure strength	120Mpa
7	Tensile strength	2139KN
8	Torque strength	61KN.m
9	Service	H2S,NACE MR0175(>175oF)
10	Working temperature	-29oC+204oC
11	Connection thread	3 7/8CAS. BXP or 3 1/2 IF.BXP

table3

Specifications	5"
OD	127.5mm
ID	57mm
Length	2312mm
Working Pressure	105Mpa
External Yield Pressure strength (Collapse Pressure)	139Mpa
Working condition	Full H2S
Service environment	Mud, Crude Oil, Natural gas NACE MR0175(>175F)
Service temperature	--29oC~+204oC
End connections	3 7/8 CAS, 3 1/2" IF