Petroleum sulfonate compounded system for oil displacement and preparation method thereof

Abstract

The invention relates to a compound adjustment method of petroleum sulfonate, which provides a petroleum sulfonate compounded system for oil displacement, which ensures that lamination does not occur when a product is laid within 30 days at normal temperature and a preparation method of the petroleum sulfonate compounded system. The system takes petroleum distillate oil as raw material, takes gaseous sulfur trioxide, liquid sulfur trioxide or fuming sulfuric acid as sulfonating agent, takes petroleum sulfonate, the active matter content of which is larger than 28 percent, formed by neutralizing ammonia or sodium hydroxide as a base, and is formed by adding dodecyl benzene sulfonic acid, heavy alkyl benzene sulfonic acid, alpha-olefin sulfonic acid, alkali or water. The system comprises the following components by mass: 40 to 90 percent of petroleum sulfonate, 0 to 20 percent of dodecyl benzene sulfonic acid, 0 to 20 percent of heavy alkyl benzene sulfonic acid, 0 to 10 percent of alpha-olefin sulfoacid, 0 to 30 percent of alkali and 0 to 40 percent of water. By adopting the technical scheme, the adaptability of petroleum sulfonate products in an oil field is improved, the product stabilizing capacity is enhanced, and the production process of the petroleum sulfonate is simplified.

Description

technical field [0001] The invention relates to a compound adjustment method of petroleum sulfonate in the field of oil field tertiary oil recovery, in particular to a compound system of petroleum sulfonate for oil displacement and a preparation method thereof. Background technique [0002] Petroleum sulfonate is an anionic surfactant produced from petroleum distillate oil. Due to its wide source of raw materials and good compatibility with formation fluids, it has become an important oil displacement agent in oilfield tertiary oil recovery. At present, there have been many studies on the production process of petroleum sulfonate, such as CN1472199A method for continuous sulfonation of 150-580 ℃ raw material oil, CN101318112A method for supergravity sulfonation of 200-550 ℃ distillate oil, because the product contains a large amount of unsulfonated oil, the product has poor stability and is prone to stratification. CN1275431A reports the method of membrane sulfonation of 32...

AI Technical Summary

Problems solved by technology

At present, there have been many studies on the production process of petroleum sulfonate, such as CN1472199A method for continuous sulfonation of 150-580 ℃ raw material oil, CN101318112A method for supergravity sulfonation of 200-550 ℃ distillate oil, because the product contains a large amount of unsulfonated oil, the product has poor stability and is prone to stratification

CN1275431A reports the method of membrane sulfonation of 320-380°C petroleum distillate oil, CN1327979A three-stage tank group type sulfonation method of 380-520°C distillate oil, CN1203935A method of sulfonating 200-500°C distillate oil, CN102190604A hydrogenation treatment of raw materials The method of sulfonation after oil, in these methods, alcohol water extraction measures are added, although the content of active substances and product stability of the product are improved, but the production process is more complicated

Due to the difference in raw material oil and sulfonation process, the performance of the product is different. At the same time, the application of the product is greatly limited due to the change of water quality and crude oil composition in the oilfield block.

CN101455950A adopts the method of producing petroleum sulfonate by sulfonation after mixing distillate oil at 200~500°C with heavy alkylbenzene. Although the adaptability and stability of petroleum sulfonate are improved to a certain extent, the product completely conforms to oil field Requirements, it is necessary to make major adjustments to raw materials, proportioning, production process parameters, etc., the production control is difficult and the product qualification rate is low

CN1865392A uses petroleum sulfonate as the main agent to prepare the method for tertiary oil recovery oil displacement agent, but the anionic surfactant used mainly exists in solid state, needs to be configured separately before use, and needs to use nonionic surfactant, solvent, sodium chloride etc. Occupying a lot of equipment and complex production process