MAIN METHODS OF INITIAL OPENING THE CASING, CEMENT AND FORMATION
It should clearly distinguish main (primary and mandatory) methods of initial opening the casing, cement and productive formation, and secondary (optional, subsequent and possible) stimulation methods.
The main methods of initial opening are
different kinds of drilling
abrasive jet’s (point) perforation
various types of slotting perforations
Sometimes this is enough to get oil or gas useful inflow.
Perforation (opening the casing, cement and productive formation) is an important element in the construction of the well and its operation, since should carry out high-quality communication with a well formation reservoir.
The quality of the perforation depends on creating optimal operating conditions, the duration of operation of the well, its flow rate, water cut and subsequent trouble-free conduct of the various geological and engineering operations and process steps.
A method of perforating the casing must ensure the creation of perforations that allow uncomplicated for a long time and with complete dedication to operate the producing formation.
Applied currently cumulative perforation does not provide a perfect hydrodynamic connection with the well producing formation. This is associated with high shock loads, temperature, trip charges inefficiency, which leads to the destruction of attachment hole, her premature flooding.