Crack net forming technological method based on volume fracturing

Abstract

The invention discloses a crack net forming technological method based on volume fracturing, and belongs to the technical field of oil and gas reservoir improvement. The method comprises the following steps that perforation is carried out on a casing pipe in a horizontal well to form a first perforated hole; the first perforated hole is fractured to form a first crack; a bridge plug is placed into the horizontal well and subjected to setting so as to separate an N perforated hole from a well mouth of the horizontal well; the portion on the side, close to the well mouth direction, of the bridge plug on the side wall of the horizontal wall is subjected to perforation to form an N+1 perforated hole; the portion on the side, close to the well mouth direction, of the N+1 perforated hole on the side wall of the horizontal wall is subjected to perforation to form an N+2 perforated hole; fracturing is carried out inside the horizontal well, so that an N+1 crack is formed at the position of the N+2 perforated hole; after the N+1 crack is formed, a plug is placed into the horizontal well in the fracturing process to plug the N+1 crack; and fracturing continues to be carried out on the horizontal well, so that an N+2 crack is formed at the position of the N+1 perforated hole, wherein N is equal to 1, 3, 5, 7, ..., 1+2M, and M is an integer larger than or equal to 0.

Description

technical field [0001] The invention relates to the technical field of reservoir transformation of oil and gas reservoirs, in particular to a process method for forming a fracture network based on volume fracturing. Background technique [0002] The core technology for shale reservoir stimulation is horizontal well staged fracturing technology. Currently, the general technology used in the field is staged fracturing technology for bridge plug sealing and separation. figure 1 It is a schematic flow diagram of the shale reservoir bridge plug sealing separation staged fracturing construction process in the prior art, as shown in figure 1 As shown, the fracturing sequence is fracturing step by step from the toe end of the horizontal well to the heel end. After the first stage of perforation and fracturing is carried out, the construction sequence of each other stage is completed through the steps of lower bridge plug setting-perforation-fracturing, until the entire reservoir is...

AI Technical Summary

Problems solved by technology

[0003] However, ordinary staged fracturing technology does not have the concept of volume fracturing, does not consider the influence of stress interference between fractures, and does not consider how to reduce or even reverse the formation horizontal principal stress difference to form a fracture network, so the formed fracture network structure The scale is small or no fracture network structure is formed, which ultimately leads to unsatisfactory fracturing effects and small volume of reservoir stimulation

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