Viscosity-reduction, profile-control and oil-displacement oil well additive, oil well combination treating agent and application thereof

Abstract

The invention relates to viscosity-reduction, profile-control and oil-displacement oil well additive, oil well combination treating agent and application of the viscosity-reduction, profile-control and oil-displacement oil well additive and the oil well combination treating agent. The oil well additive comprises the following components by weight: 1-15% of OBS, 10-50% of alcohol, 1-2% of ammonium chloride, 1-2% of sodium nitrite, with the balance being water. The oil well combination treating agent comprises the oil well additive prepared with the stated components. The oil well combination treating agent further comprises, by weight, 5-10% of nonylphenol polyoxyethylene ether (NPE) and / or 10-15% of sodium alcohol ether sulphate (AES), with the balance being water. The additive and the oil well combination treating agent can effectively reduce the interfacial tension, are strong in foaming capability, and can achieve the purposes of viscosity reduction, profile control and oil displacement.

Description

technical field

[0001] The invention relates to an oil well auxiliary agent for viscosity reduction, profile control and oil displacement, combined treatment agent for oil well and application thereof. Background technique

[0002] There are many methods used in oilfields for viscosity reduction, profile control and oil displacement in steam huff and puff wells. However, due to the influence of high temperature and high pressure, the choices of viscosity reducer, profile control agent and oil displacement agent are limited. There have been many attempts over the years to figure out how to get the most out of limited resources.

[0003] "Study on the Technology of Improving the Development Effect in the Late Stage of Multi-round Huff and Puff of Heavy Oil Reservoirs" Doctoral Dissertation of China University of Petroleum in 2007, Li Jinfa. "Research and Application of New Foam Control and Displacement System in Thermal Recovery Wells" 2011 Master's Thesis of China Universit...