Drill Stem Testing Select Tester Valve 15000 psi High Pressure Full H2S Service

Brief of Select Tester Valve

The select tester valve is the full bore tester valve with lock open mode. The Tester Valve used for downhole testing operation is operated by the annulus pressure, which controll to operate the ball valve.
The select tester valve is composed of four basic sections; ball valve section, upper hydraulic section, nitrogen section and the metering section.

Specification of the downhole tester valve

Select Tester Valve Function Test Sample:
Time: 12-03-2016 Temperature: 18 ℃
5.1 ( 1^st Time )
1) original nitrogen pressure: 19.3Mpa operating pressure: 26.9Mpa Pressure to Open the Ball valve:24.3Mpa
Ball valve Position: Open
The nitrogen pressure after holding operating pressure for 10minites: 24.2Mpa
The time when nitrogen pressure increases to 26.2MPa (3800psi): 26.2Mpa/20 minutes
2) Operating Pressure when pressure released: 0 MPa position of ball valve: Closed
The nitrogen pressure after 10minites: 19.3 MPa
The time when nitrogen pressure decrease to 19.3 (2800psi): 19.3Mpa/ 5 minutes


5.2 Locked-open operating mode test( 1^st Time)
1) original nitrogen pressure: 19.3 MPa operating pressure: 35 MPa
ball valve open pressure: 25.5 MPa position of ball valve: Open
The nitrogen pressure after holding operating pressure for 10minites: 28.3 MPa
The time when nitrogen pressure increases to 32.4±0.7MPa (4700psi±100psi): 32Mpa / 15minutes
2) operating pressure after release: 0 MPa position of ball valve: Open
The nitrogen pressure after holding operating pressure for 10minites: 19.3 MPa
The time when nitrogen pressure releases to 19.3MPa (2800psi): 19.3Mpa/8 Minutes
3) original nitrogen pressure: 19.3 MPa operating pressure: 35 MPa position of ball valve: Open
The nitrogen pressure after holding operating pressure for 10minites: 29.7 MPa
The time when nitrogen pressure increases to 32.4±0.7MPa (4700psi±100psi): 32.4Mpa/14Minutes
4) operating pressure after release: 0 MPa position of ball valve: Closed
The nitrogen pressure after holding operating pressure for 10minites: 19.3 MPa
The time when nitrogen pressure releases to 19.3 MPa (2800psi): 19.3Mpa/ 7 Minutes


All the raw materila used for the DST tools will be test by SGS at the thrid party testing lab, SGS made the mark and keep the traceability of each DST tools parts.

The drill stem testing tools are applied in cased hole, open hole and slim hole, the main DST tool string includes RTTS packer, circulating valve, safety joint, select tester valve, omni valve, hydraulic jar, shock absorber, RD safety circulating valve, high pressure retrievable packer with bypass, IPO valve, tubing string test valve, and so on.

We approach every client’s enquiry with meticulous attention to technical specifications, and a high level of appreciation for their urgency.

Welcome to contact us for more information!!

ZZ Top Oil Tools Co.,Ltd as head office registered in Xi’an City in 2010, and in 2016, ZZ TOP OIL TOOLS enlarged the downhole oil tools factory under the Brand - TECHCORE in Baoji, which engages in designing and manufacturing the downhole oil tools including DST tools, Coiled tubing tools etc.

As one group, ZZ TOP provides the clients highly efficient & expertise service as well as more comprehensive products to meet the customers' requirements during the work, and insists on "Traceability, Serialization" for each tools and related parts

Equipments List

Techcore specialized in design, manufacture and sales of the oil well downhole tools as below:

* Drill stem testing tools for cased hole,  open hole and slim hole:

Retrievable packer, circulating valve,safety joint, downhole tester valve,LPR- N Valve, multi-cycle circulating valve, hydraulic jar, shock absorber, RD safety circulating valve,CHAMP packer, IPO valve, tubing string test valve, drain valve,RD sampler, super safety valve etc.

* Coiled Tubing Tools: Double slip connector, roll on connector, roll on x thread connector, double flapper check valve, motor head, dual function circulating valve, hydraulic jar, fishing tools etc.

* Perforating tools: Various perforator & perforating gun system, Shaped Charge Body

 *Oil well completion tools include: Subsurface safety valve, wireline retrievable subsurface safety valve, single string production packer, dual strings production packer, ESP packer, mechanical set packer, permanent packer, compensation device, bridge plug, sliding sleeve, nipples etc. 

DST Tools Warehouse