Hydraulic expansion packer mainly consists of valve system joint assembly\rubber barrel\central tube\casing sub.The valve system is divided into axial valve system and radial valve system.Radial valve system is composed of a set of three valve.

In the construction process, the replace plug will touch off the breaking stick which is sealed in the intake hole when the replace plug through the valve joint of the packer. The replace plug will make the casing form seal when it move to the spoiler (we also can use pitch or blind plate and pipe string process structures make casing form seal,for these process pipe string structure without plug through so we should take off the breaking stick
in advance),Bie pressure liquid through the valve system of intake hole into the open valve, when the pressure to achieve set valve, the pin on the open valve is snapped. Open valve open, and at the same time, single valve is opened, the fluid through limiting valve into the expansion cavity between center pipe and rubber cylinder ,make packer inflation and wall close contact form seal.
When the pressure of the expansion cavity reach the value of limiting valve's pin pressure, pin shear, limiting valve closed and will make intake hole sealing,the casing pressure value have no influence on the pressure inside the expansion cavity, realize safe seat seal, wellhead put pressure is zero, open valve automatic locking, realize permanent closed, after the downhole pressure operation does not affect the packer fate.
In some special pipe string process well, also can use the inner pipe tools to a packer, achieve completion purpose (such as packer direct completion and packer in the screen between the packer and completion method).

ZZ TOP OIL TOOLS is the professional manufacturer for the drill stem testing tools and surface testing equipment. All the DST tools are conformed with NACE MR 0175 with traceability,and the DST tools can be worked in H2S & CO2 above 175 F and full H2S, also with the skilled and experienced engineers, we can design the drill stem testing tools as per customer's well condition. Moreover, we supply the training in our factory and operation instruction at the well site. The DST tools are exported to USA, Colombia, India, Pakistan, Iran, Brazil etc. and enjoy the good reputation from the customers.

To shorten the delivery time, we proceeded the DST Tools in stock:

Packer,circualting valve,select tester valve,APR N-valve,OMNI valve,Hydraulic Jar,Tubing string tester

1. Full bore Packer, 7" Casing, working pressure 70Mpa, Working Temperature 400F, Connection: IF, 4set

2. Tester valve, 5", Working pressure 105Mpa, Working temperature 400F, Connection CAS. BXP, 4 sets

3. Hydraulic Jar,5", Working pressure 105Mpa, Working temperature 400F, Connection CAS. BXP, 4sets

4. Rupture disk Circulating valve, 5", Working pressure 105Mpa, Working temperature 400F, Connection CAS. BXP, 4sets

5. Flowhead (surface test tree), 3 1/16", working pressure 70 Mpa. 1set

Should you have any interest or inquiry on the Drill stem testing tools, contact us freely