Hydraulic fracturing technology for horizontal well with fractures

Abstract

The invention discloses a hydraulic fracturing technology for a horizontal well with fractures. The hydraulic fracturing technology comprises the following steps in sequence: (1), according to on-site information, calculating the stress difference values caused by major fractures and adjacent fractures; (2), according to the stress difference values caused by the major fractures and the adjacent fractures, calculating the pressure required when the fracture turns; (3), according to the pressure required when the fracture turns, determining the intensity of temporary plugging agents, and calculating the corresponding construction displacement; (4), according to the design parameters, conducting the segmental multi-cluster fracturing and impulse-type temporary plugging pressurizing technology on a reservoir stratum simultaneously. The hydraulic fracturing technology is mainly based on the horizontal stress difference drop-out values caused by the major fractures and the adjacent fractures, and simultaneously adopts the segmental multi-cluster fracturing and impulse-type temporary plugging pressurizing technology to force the fracture to turn, breaks through the technical bottleneck that the fractures are difficult to form in the stratum with a high stress difference and rudimentary natural fractures, and fills in the blank in the prior art.

Description

technical field [0001] The invention relates to a hydraulic fracturing stimulation measure for oil and gas wells, in particular to a fracture network fracturing technology capable of significantly increasing the effective volume of stimulation in high-stress-difference strata with no natural fractures. Background technique [0002] In recent years, fracture network fracturing technology has been widely used in the stimulation of unconventional oil and gas reservoirs. With the increasing difficulty of exploration and development, the popularization and application of this kind of fracturing technology is gradually limited. The main reasons are: it is difficult to form multi-branched fractures in reservoirs without natural fractures; high-level principal stress difference reservoirs cannot achieve fracture diversion; For example, the intralayer explosive fracturing technology has poor operability and high risk. Therefore, it is difficult for horizontal well staged fracturing ...

AI Technical Summary

Problems solved by technology

The temporary plugging and fracturing process of degradable fibers in fractures (CN201310610753) uses degradable polyester fibers + linear glue + proppant and aqueous solution to perform fracturing to achieve in-fracture steering, but laboratory simulations show that when the stress difference is higher than 10MPa, all The required construction displacement is greater than 12.9m 3 / min, it is almost impossible for field equipment to meet this requirement, and continuous injection of fiber agent is likely to cause sand plugging and fracturing failure

[0005] So far, there is no method to effectively form a fracture network for high stress difference formations with no natural fractures

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