Self-adaptive degradable material suitable for underground reservoir temporary plugging fracturing operation

Abstract

The invention relates to a self-adaptive degradable material suitable for underground reservoir temporary plugging fracturing operation. The material comprises a degradable flexible container and a degradable wire harness packaged in the degradable flexible container, wherein the degradable wire harness is provided with a knot which protrudes outwards relative to the wire harness. According to thematerial, the degradable flexible container is adopted to completely coat or wrap the degradable wire harness to form a composite structure similar to amber, the composite structure can be driven byunderground fluid to be conveyed to a target crack or hole to be treated, as the degradable flexible container is mainly made of a flexible degradable resin or the flexible degradable resin and a water-soluble resin, the degradable flexible container has good flexibility, and can generate self-adaptive deformation to a certain extent under the action of the underground fluid and formation pressureso as to generate deformation matching a cross section of the target crack or hole, and the target crack or hole can be quickly blocked.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an adaptive degradable material suitable for temporary plugging and fracturing operations of underground reservoirs. Background technique [0002] At present, during the exploitation of oil and gas fields, in order to improve the permeability of underground reservoirs and connect oil and gas reservoirs in low-permeability areas, it is usually necessary to perform temporary plugging and diversion to fracturing. Temporary plugging diversion fracturing construction is to add temporary plugging materials in real time during the fracturing construction according to the heterogeneity of the reservoir plane and vertical direction, as well as the difference in the production degree of different regions and layers, and temporarily plug old fractures or existing cracks. Sand fractures divert fluid through changes in fracture pressure and fracture extension pressure to...

AI Technical Summary

Problems solved by technology

[0003] In the actual application of the existing fiber temporary plugging agent, since the multi-bundle fibers are easy to be entangled with each other, the pumping is relatively difficult. In order to achieve effective pumping, a large amount of carrier fluid must be used, which will undoubtedly cause material waste, increase production cost

In addition, in the actual pumping process, the intertwining of multiple bundles of fibers tends to form a disorderly "coil-like" fiber assembly, which is easy to It is intercepted by the protruding walls on the surface of underground formation fractures, so that the fibers cannot effectively reach the target fracture area, resulting in a waste of temporary plugging agent

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