Profile control agent and profile control method

Abstract

The invention provides a profile control agent and a profile control method. The profile control agent comprises a first system and a second system, wherein the first system is prepared from the following raw materials and components in percentage by mass: 10 to 20 percent of smectite, 10 to 25 percent of pulverized fuel ash, 5 to 15 percent of silicon dioxide, 0.2 to 0.8 percent of a modifying agent, 0.4 to 1 percent of a toughening agent, 0.8 to 2 percent of an activating agent and the balance of water; the second system is prepared from the following raw materials and components in percentage by mass: 15 to 25 percent of calcium chloride or magnesium chloride, 10 to 25 percent of sodium silicate, 5 to 15 percent of slag powder, 3 to 10 percent of sodium fluosilicate and the balance of water. The profile control method comprises the following steps: injecting the first system into a formation; then respectively injecting a water solution of the calcium chloride or the magnesium chloride and a mixed solution of the sodium silicate, the slag powder and the water into the formation, and completing profile control. The profile control agent provided by the invention is capable of blocking big pores, regulating steam injection profile and increasing displacement efficiency of steam after underground reaction, so that the purposes of improving a steam injection effect and increasing the recovery efficiency of surplus oil are achieved.

Description

technical field [0001] The invention relates to a profile control agent and a profile control method, belonging to the technical field of petroleum exploitation. Background technique [0002] At present, steam flooding development technology has been widely used. However, because the reservoir usually has differences in heterogeneity, specific gravity and viscosity of oil, gas, water, etc., with the continuous improvement of the development degree of steam flooding. The reservoir is prone to a series of problems, such as steam overburden, fingering, steam channeling, and uneven effect between layers, which will directly reduce the effect of steam flooding. There are two main types of solutions, mechanical methods and chemical methods. [0003] The mechanical method generally adopts the stratified steam flooding technology, which is mainly aimed at the oil layer with well-developed barrier to solve the problem in the near-wellbore zone. [0004] The chemical method is gene...

AI Technical Summary

Problems solved by technology

However, because the solid phase particles in conventional chemical profile control are easy to block the steam injection pipe string, it is easy to cause serious accidents such as overhaul, and there is a huge safety risk, and the granular plugging agent has a large particle size and no selectivity, which is easy to affect the reservoir. cause some damages

In addition, foam water shutoff agents can also be used, but the plugging strength of this kind of water shutoff agents is too low and the formation adaptability is poor

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