Technology for introducing coated sand into fracturing modification

Abstract

The invention discloses a technology for introducing coated sand into fracturing modification. During fracturing operation, the surfaces of sand particles expand firstly after the coated sand enters a crack, and the coated sand is consolidated under the action of formation temperature after a certain period of time. A layer of hard shell is formed on the surfaces of the sand particles, so that the crush resistance of the sand particles can be remarkably enhanced; moreover, technical sand particles are coated in a film after being crushed, so that crushed sand and mealy sand in the formation are prevented from migrating in the crack; the sand particles are consolidated and an overall filtration layer is formed, so that the sand particles are prevented from being ejected back and a sand prevention effect is achieved; and the embedding degree of a propping agent can be eliminated or lowered under the action of the flexibility of a coating shell, so that high flow conductivity of the crack is totally enhanced and kept, and fracturing effective period is prolonged.

Description

Technical field [0001] The technology relates to the fracturing reconstruction of oil fields, in which coated sand is introduced into the fracturing reconstruction, and belongs to the field of oil exploitation. Background technique [0002] For oilfields with ultra-low permeability, micro-fractures and double-porosity reservoirs, and relatively developed faults, fracturing is the most effective means to improve reservoir productivity. However, fracturing in some oilfields is difficult and needs further improvement. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the invention provides a technique of introducing coated sand in fracturing reconstruction. [0004] The technical solution adopted by the present invention to solve its technical problems is: [0005] Coated sand is a material coated with a layer of polymer film on the surface of conventional aggregates such as quartz sand or ceramsite by technical means. Consolidation ...

AI Technical Summary

Problems solved by technology

[0002] For oil fields with ultra-low permeability, micro-fractures and double-porosity medium reservoirs, and relatively well-developed faults, fracturing is the most effective means to improve reservoir productivity. However, fracturing in some oilfields is difficult and needs further improvement