Drill Stem Testing Tools 

 product name API Standard ISO oil well drilling tools-drill centralizer used on oilfield drilling stem
General:
Cased Hole DST tools are full bore and annular pressure operated which are used for testing formations after casing has been set in a well. Full-bore tools allow perforating through the system. Also allow high production flow rates.
Material:
For standard DST tools, the main material is AISI 4130, and as perspecial working ambient material Inconnel 718 will be used forhigh standard requirements toprevent H2S, Sour acid damage.
The standard material of O ringsis Viton for normal workingtemperature i.e Max. 400F, Fluorel may also used as per specialrequirements of high standard i.e. Max. 450F.
Maintenance
As for each tool running job the tools should be disassembled for O ring replaced and testingagain for next job preparation, all the O rings and metal parts will be available with tools as redress kits.
Testing
The tools should be tested inpressure, sealing, function,movement before each job, thetesting equipment also can besupplied here with all relative connection pipes, sensors and so on.
Ordering
Generally below information is suggested to supplied in order to figure out theproper tools which can be working in good condition and safety.
Size i.e. 3 7/8", 5" or casing size from 4 1/2" to 20"(Casing range may also need to be known)
Working pressure: 70Mpa(10000psi), 105Mpa(15000psi).
Working Temperature: i.e. 400F
Working ambient: CO2,H2s, HCl...
Top and bottom connection: IF, CAS, EUE....

Oil well drill stem testing tools DST Tools