Terpolymer oil soluble viscosity reducer for thick oil exploration and transportation and preparation method thereof

Abstract

The invention relates to a terpolymer oil soluble viscosity reducer for thick oil exploration and transportation and a preparation method thereof. The terpolymer oil soluble viscosity reducer for thick oil exploration and transportation is characterized in that the viscosity reducer is prepared from methacrylate ester, N, N'- 2 (methacryloyloxyethyl) diamine, styrene, azobisisbutyronitrile and toluene, and the molar ratio of all the raw materials is as follows: methacrylate ester: N, N'- 2 (methacryloyloxyethyl) diamine: styrene is (4 to 5): (2 to 3): (2 to 4), the added amount of the azobisisbutyronitrile is 0.5 to 2 percent of the total mass of the methacrylate ester, the N, N'- 2 (methacryloyloxyethyl) diamine and the styrene, and toluene serves as the solvent; the methacrylate ester is prepared from acrylic acid, C16 to C22 higher alcohols, sulfoacid catalyst and phenolic inhibitor; and the N, N'- 2 (methacryloyloxyethyl) diamine is prepared from methyl acrylate and diamine. The oil soluble viscosity reducer has the advantages of good effect, strong universality, no pollution and relaxed use conditions, and can simultaneously meet the needs of thick oil exploration and transportation.

Description

technical field [0001] The invention relates to a terpolymer oil-soluble viscosity reducer for heavy oil exploitation and transportation and a preparation method thereof. Background technique [0002] Our country is rich in heavy oil resources and widely distributed, but there are still many problems in production technology such as heavy oil exploitation and gathering and transportation. The main reasons are high colloid and asphaltene content, high viscosity, high density and poor fluidity in heavy oil. [0003] Oil-soluble viscosity reducer can not only effectively reduce the freezing point and viscosity of heavy oil, loosen the structure of heavy oil, improve its fluidity, but also avoid post-processing problems caused by emulsification and viscosity reduction. Viscosity reduction with an agent is an effective method to solve the problems of heavy oil production and transportation. In recent years, the research on oil-soluble viscosity reducers at home and abroad has d...

AI Technical Summary

Problems solved by technology

However, the existing oil-soluble viscosity reducers have low viscosity reduction effect and poor universality, and most of them are only used as fluidity improvers for heavy oil transportation

[0004] At present, in some oilfields in my country, such as Tahe Oilfield, the heavy oil not only has a very high content of heavy components such as colloids and asphaltene, it is a rare super heavy oil in China, but also has a well depth of more than 5,000 meters, which is extremely difficult to mine. The production methods of other shallow heavy oil reservoirs at home and abroad, such as steam huff and puff, steam flooding, SAGD, etc., are not suitable for the production of heavy oil, but compared with them, mixing thin oil in the wellbore to reduce viscosity is a suitable and effective production method , but with the increase of production scale and the increasing shortage of thin oil resources, it is very necessary to seek an oil-soluble viscosity reducer that can not only reduce the amount of thin oil added, but also meet the needs of heavy oil production.