METHOD FOR WELL COMPLETION Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: method includes running a swab into pipes, below liquid level, raising swab with liquid to well mouth with connection and disconnection of inner pipe space to behind-space. At the beginning swab is lowered into pipes below liquid level and raised with liquid to mouth. By hoisting swab level in well is decreased until pit pressure equals bed pressure. Swab is then extracted. Pulse flow disruptor is lowered into pipes and mounted in saddle. Pulse disruptor is a spring-loaded back valve, operating in unstable mode. Swab is lowered, immersed below liquid level in tubing string and raised to mouth, removing liquid from well, which liquid is below swab. By hoisting swab, pressure in face is lowered below bed pressure, speed of liquid flow from face-adjacent area is increased to maximum value. This is appropriate to decrease of liquid level in behind-pipe space until ceiling of bed. Completion of well is considered finished dependent on decrease of level of dirt in liquid and amount of influx.

EFFECT: higher efficiency.

1 dwg, 1 ex