Flow guiding and fracturing method

Abstract

The invention relates to a flow guiding and fracturing method. The flow guiding and fracturing method is characterized in that the adding of propping agent and the designing of fracturing fluid are carried out through unevenly perforating in a short pulse mode, the propping agent can be unevenly placed in a fracturing seam in a pier column mode, i.e. the expansion of the fracturing seam is kept by forming a propping agent pier column in a fractured fracturing seam, oil gas flows through a channel formed by the propping agent pier column without passing through a propping agent filling body any more, unlimited flow guiding capacity can be generated due to a pier column structure, the flow back of liquid and polymer can be more facilitated, and the damage to the surface of the fracturing seam is smaller. The flow guiding capacity of the fracturing seam formed by the fracturing of the propping agent pier column does not depend on the performance of the propping agent, and thus the propping agent in high quality does not need to be chosen.

Description

technical field [0001] The invention relates to an oil-gas well fracturing process in the technical field of petroleum and natural gas exploitation, in particular to a new low-damage oil-gas reservoir fracturing method. Specifically, the present invention relates to a novel fracturing method that achieves greater oil and gas recovery by increasing the conductivity and half-length of the effective fracture, that is, forming uneven proppant pillars in the fractures that are opened. Keeping the fractures open, the oil and gas no longer pass through the proppant packing body, but flow through the channels formed by the proppant pillars. This pillar structure can generate infinite flow conductivity, which is more conducive to the flowback of liquids and polymers , and less damage to the crack surface. Background technique [0002] my country's low-permeability oil and gas resources are huge, accounting for more than 70% of the total proven reserves, and are the main potential ar...

AI Technical Summary

Problems solved by technology

[0008] However, it is still difficult to ensure that the proppant is not uniformly distributed in the fracture and during fracture closure during transport from the pumping equipment to the fracture

The biggest risk is the dispersion of the proppant pulse segment during its transport. The dispersion of the proppant slug will lead to the failure of this technique, because it will reduce the concentration of the proppant segment before fracture closure and reduce the height of the proppant column. This also results in flow channels with no clear demarcation

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