Thickened oil steam production synergist and its preparing method

Abstract

The synergist for steam exploitin thickened oil consists of gas creating agent 10-40 wt%, surfactant 5-25 wt% and alkali 0-5 wt% except water. The preparation process includes the steps of: dissolving sodium hydroxide and / or sodium carbonate; adding surfactant via stirring for mixing and adding the gas creating agent via stirring. Under steam temperature urea as the gas creating agent is decomposed to generate CO2 and CO2 and the surfactant form foam to expand the steam wave and volume to raise the oil displacing efficiency and reach the synergistic effects of modifying profile and lower viscosity obviously. The present invention is suitable for exploiting shallow, thin, dense and dispersed thickened oil reservoir. The present invention can raise oil yield and steam heat efficiency.

Description

technical field [0001] The invention relates to the field of petroleum exploitation chemistry, and relates to a heavy oil steam exploitation synergist and a preparation method thereof. Background technique [0002] At present, the synergist used in the steam recovery of heavy oil in domestic oilfields is a single surfactant or alkali. Although the surfactant-based steam synergist has a high viscosity reduction rate, its cost is high, which affects industrial use and is difficult to accept. Alkaline steam booster is cheap, but its use concentration range is narrow, and it is difficult to control on site. In addition, these two types of steam synergists have good effect in the initial stage of heavy oil steam injection production, but with the increase of steam huff and puff cycles, the increase of heavy oil formation will affect the thermal efficiency of steam injection, even if surfactant or Alkaline steam synergists, the production situation is also deteriorating. [0003...

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Problems solved by technology

[0004] However, this method only uses urea decomposition gas to increase the driving energy of steam, and is not suitable for shallow, thin, thick, and scattered heavy oil reservoirs, and steam enhancement only applies a single chemical viscosity reduction or profile control technology, or adjustment Splitting and viscosity reduction are carried out in two steps, so that there are many construction steps, long period and high investment

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