Single-fluid process based silicate water shutoff agent and preparation method

Abstract

The invention provides a single-fluid process based silicate water shutoff agent and a preparation method. The water shutoff agent is prepared from the following materials in parts by mass, 50-55% ofwater glass, 3-4% of curing agents, 1.5-2% of filtrate loss reducers, 1.5-2% of enhancers, 0.2-0.3% of thickener and the balance of water. The single-fluid process based silicate water shutoff agent and the preparation method have the advantages that the cost of the prepared water shutoff agent is 76% of that of water shutoff agents TP910 and 10.56% of that of phenolic resin type water shutoff agents; the water shutoff effect is good, and the maximum bearing pressure is 20MP, 22MPa and 25MPa respectively at the temperatures of 30 DEG C, 60 DEG C and 80 DEG C; multiple production methods can beselected, and actual production and use can be adjusted in time; the obtained water shutoff agent system is stable; field operations are simple; the prepared water shutoff agent is carried to a construction site by a tank car for the water shutoff agent, and is pumped into the stratum during construction directly; generated colloids have high strength, stable shape and small shrinkage deformation, and permeable layers can be sealed for a long time.

Description

technical field

[0001] The invention relates to the technical field of oilfield chemistry, in particular to a single-liquid method silicate water blocking agent and a preparation method. Background technique

[0002] In the middle and late stages of oilfield development, the injected water rushes along the high-permeability layer, and the low-permeability oil layer is repeatedly artificially fractured, and the degree of water flooding of each sedimentary unit of the oil layer is serious. The water cut of the oil well rises, and the oil well floods prematurely. In the past, the double liquid water plugging method was commonly used in oilfields. Two different chemical working fluids are used, separated by spacer fluid, alternately injected into the formation, and moved for a certain distance in the formation. The two chemical working fluids contact and produce physical and chemical effects to produce plugging substances. It is impossible for the two chemical agents to be in ...