Underbalance perforation technology with subsequent development using an ESP or a jet pump

Purpose

Underbalance perforation technology with the assembly initiation using a (MPSI) microprocessor system of initiation and subsequent development using an ESP, ensuring minimal impact on the reservoir during the secondary drilling.

Operating principle

The perforation system assembly is run on tubing together with the process equipment (ESP). After the installation to a predetermined perforation interval, the MPSI is activated by generating successive pressure pulses. Further, the ESP pump creates a depression, the time for this is determined in the MPSI. When the target level of depression is reached, an explosive chain is initiated. The well development can be started immediately after perforation without additional technological operations.

Pressure chart for underbalance perforation using MPSI and ESP

Advantages of the technology:

• combined trip of the perfosystem and technological equipment;
• perforation and the beginning of development in one trip;
• programming the MPSI for shooting to achieve the required level of depression;
• the option to cancel the initiation at any time;
• can be used with a packer or anchor;
• the possibility of offline data recording before and during perforation.
• the presence of a safety depreciation system to protect the process equipment.