Oil-water well sand consolidation agent as well as preparation method and application thereof

Abstract

The invention discloses an oil-water well sand consolidation agent as well as a preparation method and application thereof, and belongs to the field of oil-water well sand consolidation. The oil-waterwell sand consolidation agent is prepared from the following components in percentage by weight 41 to 45 percent of aqueous solution of silicate, 8 to 20 percent of carbamide or ammonium carbonate, 0.06 to 0.1 percent of coupling agent and the balance of water, wherein the mass fraction of silicate in the silicate aqueous solution is 35 to 40 percent. The oil-water well sand consolidation agent covers the surfaces of sand after entering a petroleum reservoir stratum, and is combined with the carbamide or hydrogen ion generated by hydrolyzing ammonium carbonate through silicate ion generated by hydrolyzing silicate to form a polymer poly-silicate; silicon-oxygen bonds in the poly-silicate are cross-bonded to from a three-dimensional structure, so that curing layers on the surface of the sand in the petroleum reservoir stratum are cemented together for a sand production rate of the reservoir stratum; meanwhile, influence of the oil-water well sand consolidation agent on large cracks andgaps in the reservoir stratum is lowered, so that the permeation rate of the reservoir stratum and oil well yield are ensured.

Description

technical field

[0001] The invention relates to the field of oil-water well sand-fixing, in particular to an oil-water well sand-fixing agent and its preparation method and application. Background technique

[0002] During the development of sandstone oilfields, sand production often occurs in oil and water wells. The reasons mainly include the following two aspects: First, in the oil reservoirs of sandstone oilfields, the mineral content of sand grain cement is relatively high. With the extension of oil well production time, the reservoir The water content in the medium gradually rises, causing the clay minerals in the oil reservoir to be pumped to the ground along with the formation water or injected water, resulting in sand production in oil and water wells. Second, with the continuous deepening of oil well exploitation, oil reservoirs with many faults and fractures and large dip angles are severely damaged, and the rock cementation strength is low, causing sand particles...

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