Using dynamic underbalance to increase well productivity

摘要

An underbalance pressure generator includes a housing having a first end and a second end and defines a piston chamber that extends between the first and second ends. A piston is movably arranged within the piston chamber, and one or more influx ports are defined in the housing at or near the second to enable fluid communication between the piston chamber and an exterior of the housing. A locking mechanism is arranged at or near the second end and capable of securing the piston at or near the second end.

主权项

1. An underbalance pressure generator device, comprising:
a housing having a first end, a second end, and defining a piston chamber that extends between the first and second ends, the housing further providing a hydraulic fluid port at or near the first end; a piston movably arranged within the piston chamber and movable toward the second end upon injection of a hydraulic fluid into the piston chamber via the hydraulic fluid port; one or more influx ports defined in the housing at or near the second end to enable fluid communication between the piston chamber and an exterior of the housing; and a locking mechanism arranged at or near the second end to secure the piston at or near the second end, wherein a pressure differential is generated across the piston and between the piston chamber and the exterior of the housing by evacuating the hydraulic fluid from the piston chamber via the hydraulic fluid port, and wherein the locking mechanism is actuatable to release the piston to move toward the first end, which creates a pressure underbalance that draws fluids from the exterior of the housing into the piston chamber via the one or more influx ports.