Heavy oil thermal recovery chemical synergist and preparation method of same

Abstract

The invention provides a heavy oil thermal recovery chemical synergist and a preparation method of same. The synergist is prepared by compounding a small cationic quaternary ammonium salt, a surfactant, alkali, wherein the small cationic quaternary ammonium salt accounts for 10-40% by weight, the surfactant accounts for 5-25% by weight, the alkali accounts for 1-5% by weight, and the balanced being water. The preparation method includes the following steps: 1) dissolving sodium hydroxide, sodium carbonate, or a mixture composed of sodium hydroxide and sodium carbonate; and 2) adding the surfactant at 20-40 DEG C and mixing and stirring the mixture for 1-2 h, and adding the small cationic quaternary ammonium salt with stirring for 1-2 h. The small cationic quaternary ammonium salt can separate out adsorbed water among lattices of clay so that expanded clay can be dehydrated and shrunk and strata permeability is recovered, wherein a part of decomposable gases can generate a high pressure and driving energy under a vapor temperature. Hydrogen bonds in the surfactant can be combined with the hydrogen bonds in colloids and asphaltene, so that the colloids, the asphaltene and other heavy components which are deposited on surface of rocks can be diluted and stripped away under the effect of vapor. The synergist has the effects of both increasing oil displacement efficiency and enlarging vapor swept volume, has significant application effects and is suitable for vapor exploitation of heavy oil reservoir.

Description

technical field [0001] The invention relates to the chemical field of heavy oil recovery, and relates to a heavy oil thermal recovery chemical synergist and a preparation method thereof. Background technique [0002] Due to the unique oil recovery mechanism and process of the SAGD process, Canada, the United States, Venezuela and other countries have carried out a large number of experimental studies and field applications since its inception, and achieved good economic benefits. However, a single SAGD process needs to consume a large amount of steam, and the average oil-steam ratio is about 0.3. In this regard, domestic and foreign experts and scholars have done a lot of research and improvement work. One of the directions is to add non-condensable gas to the steam of the SAGD process to improve the thermal efficiency of the steam, that is, the "SAGP (Steam and Gas Push)" process; the other direction is ES-SAGD (ExpandingSolvent-SAGD), that is, adding Solvent SAGD process....

AI Technical Summary

Problems solved by technology

However, a single SAGD process needs to consume a large amount of steam, and the average oil-steam ratio is abou