Shut-off valve comprises a spherical, rotatable closure element and two axially displaceable sealing rings which can be pressed onto the spherical element. The valve casing contains two beams fitting closely around the spherical valve closure element and each having in the central plane (parallel to...
The main disadvantage of a slotted liner is that effective well stimulation can be difficult because of the open annular space between the liner and the well. Similarly, selective production (e.g., zone isolation) is difficult. Another option is a liner with partial isolations. External ...
a stop slide valve, can be blocked off, and wherein, in such a for the purpose of a leak test of the main line blocked house connection tube, which in turn, for example, on one side by means of the house-side main purely the direction of the operating method can be shut off, fro...