Hydraulic full-diameter large-displacement fracturing process

Abstract

The invention relates to the technical field of oil field extraction projects, and belongs to a hydraulic type full-bore large-displacement fracturing technique. By means of the hydraulic type full-bore large-displacement fracturing technique, the problem that an existing fracturing technique is small in bore and low in construction displacement. The technique comprises the steps that firstly, an expanding fracturing packer (5), a pressure guide sand blaster (4) and a plurality of full-bore pressure guide sand blasting packers (3) are connected with an oil pipe (2) and placed downwards into a casing pipe (1) to the preset depth; pressing is carried out, and hydraulic pressure passes through the pressure guide channel of the packers (3) and a pressure guide channel of the pressure guide sand blaster (4) so as to seal the packers; hydraulic pressure continues to be increased so that a first layer can be fractured; the hydraulic pressure is increased and enters pressure guide channel on a second layer, so that a variable-diameter ring (6) of the full-bore pressure guide sand blasting packer (3) on the second layer shrinks; a ball is tossed to the second layer, the hydraulic pressure is increased, and a sliding sleeve of the full-bore pressure guide sand blasting packer (3) of the second layer, and then the second layer can be fractured; and balls of the identical specification are used for construction from a third layer to an nth layer. The hydraulic type full-bore large-displacement fracturing technique has the advantages that the fracturing construction displacement is large, and safety and high efficiency are achieved.

Description

technical field [0001] The invention relates to the technical field of oil production engineering in oil fields, and belongs to a hydraulic full-diameter large-displacement fracturing process. Background technique [0002] Daqing Oilfield entered the later stage of development, when the peripheral low-permeability Fuyang oil layer was developed, its sand bodies were mainly fluvial facies deposits, and mainly consisted of narrow strips and intermittent strips of channel sand, and the sand bodies were small in scale and discontinuous. At present, the pipe string generally adopts a stepped sliding sleeve structure, and the diameter of the sand blaster sliding sleeve is gradually reduced (diameter is φ25-φ40), resulting in throttling effect, large friction resistance, and nearly 36% of energy loss in the pipe string. On throttling, the improvement of displacement is limited. Therefore, a hydraulic full-diameter and large-displacement fracturing process has been developed. Throu...

AI Technical Summary

Problems solved by technology

At present, the pipe string generally adopts a stepped sliding sleeve structure, and the diameter of the sand blaster sliding sleeve is gradually reduced (diameter is φ25-φ40), resulting in throttling effect, large friction resistance, and nearly 36% of energy loss in the pipe string. Throttling limits the increase in displacement

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