Preparation of water-soluble salt-resistant dispersing drag reducer for heavy oil exploitation

Abstract

The invention provides preparation of a water-soluble salt-resistant dispersing drag reducer for heavy oil exploitation. The water-soluble salt-resistant dispersing drag reducer can be used after 1 percent solution prepared from an A agent and 0.125 percent solution prepared from a B agent are mixed. A method for preparing the water-soluble salt-resistant dispersing drag reducer comprises the following steps of: putting 155 to 170 weight parts of nonyl phenol and 2 to 3 weight parts of potassium hydroxide into an agitated reactor; introducing nitrogen into the reactor, displacing for three to four times; stirring and raising temperature to be 110 to 120 DEG C; vacuumizing for 60 to 65 minutes; inflating nitrogen until the pressure is 0.01 Mpa; reducing the temperature to be 98 DEG C after keeping the constant temperature for 60 minutes; adding 80 to 90 weight parts of allyl glycidyl ether dropwise and reacting for 6 hours; reducing the temperature to be 30 DEG C after keeping the temperature of between 90 and 98 DEG C for 2 hours; adding 30 to 32 weight parts of sulfamic acid, 11 to 14 weight parts of urea and 0.3 to 0.7 weight part of thiourea into the reactor; then introducing nitrogen and vacuumizing and keeping the constant temperature for 60 minutes; adding 3 to 5 weight parts of ammonia water into the reactor; after 60 minutes, adding 620 to 670 weight parts of pure water and 45 to 55 weight parts of trichloroethylene into the reactor; controlling the temperature to be 60 to 70 DEG C for 60 to 65 minutes to obtain the A agent; and mixing 65 to 75 weight parts of anionic polyacrylamide, 10 to 14 weight parts of guar gum, 8 to 12 weight parts of polyanionic cellulose, 4 to 6 weight parts of sodium dodecyl benzene sulfonate, 2-3 weight parts of aminotriacetic acid and 0.7 to 1.2 weight part of Bronopol and mechanically stirring the mixture for 58 to 65 minutes to obtain the B agent.

Description

technical field [0001] The invention relates to the preparation of a dispersed drag reducer for heavy oil recovery, especially suitable for water-soluble and salt-tolerant environments, and can realize the effect of salt-resistant, soluble, dispersed and drag-reduced in heavy oil cold recovery. Background technique [0002] Heavy oil refers to the degassed crude oil whose viscosity exceeds 1000mPa·s at the reservoir temperature. Heavy oil has high viscosity and poor fluidity. The key to production is to reduce viscosity and improve fluidity. The developed methods include thermal oil recovery, thin oil blending, ultrasonic viscosity reduction, microbial viscosity reduction, etc. However, due to the limitation of energy and resources, chemical viscosity reduction has generally attracted attention. Chemical viscosity reduction methods include: catalytic viscosity reduction, alkali viscosity reduction, emulsification viscosity reduction, pour point depressant method, and solven...

AI Technical Summary

Problems solved by technology

However, when the existing product encounters formation water with high salinity, it will fail due to product decomposition or inability to form an emulsion with crude oil, which cannot meet the requirements of heavy oil production.

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