Southwest Petroleum University

Fayang Jin

Wanfen Pu

Rui Liu

Daijun Du

Lin Sun

Jinzhou Zhao

Xiang Li

Zezhou Fang

Wei Liao

Yangyang Zhang

Shuyu Song

Mian Wang

Peiwen Xiao

Kexing Li

Desheng Qian

Huancai Fan

Binyang Zou

Ye Ju

Bowen Chen

The present invention discloses a CO2 responsive core-shell multi-stage swelling microsphere and a preparation method thereof. The preparation method comprises the following steps: adding a styrene monomer into a sodium dodecyl sulfate solution for emulsion polymerization to obtain a spherical polystyrene solution, taking azobisisobutyronitrile and ethylene glycol for Pinner reaction to obtain an azo compound with hydroxyl functional groups at two ends, taking the azo compound with the hydroxyl functional groups at two ends as a raw material for Schotten-Baumann reaction with methacryloyl chloride to obtain BPAB, adding the BPAB into the spherical polystyrene solution to prepare an active polystyrene core solution, and dissolving the active polystyrene core solution, acrylamide, a CO2 responsive monomer, a CO2 responsive cross-linking agent and a stable cross-linking agent into water to obtain a target product. The CO2 responsive core-shell multi-stage swelling microsphere of the present invention can remarkably improve the CO2 flooding sweep efficiency.

CO2 responsive core-shell multi-stage swelling microsphere and preparation method thereof

A tight oil reservoir COflooding multi-scale channeling control system and a preparation method, including nanoscale COresponsive worm-like micellar systems and micron-scale COresponsive dispersion gel, are provided. The nanoscale COresponsive worm-like micelle system is prepared by COreactive monomers and organic anti-ion monomers stirred in water. The micron-scale COresponsive dispersion gel is made of acrylamide, a responsive monomer, a silane coupling agent modified hydroxylated multi-walled carbon nanotubes as raw materials, cross-linked in water. The tight oil reservoir COmulti-scale channel control system, has strong flow control ability during COdisplacement, and high-strength carbon nanotubes are introduced into the micro-scale COresponsive dispersion gel, which effectively improves the strength and long-term stability of the dispersion gel, significantly enhances the sealing effect on cracks, and after displacement of the COof the system, the worm-like micelles revert to spherical micelles with good responsive reversibility.

Tight oil reservoir COflooding multi-scale channeling control system and preparation method

A mine application method for in-situ nano-microspheres is provided. A water-soluble macromolecule A base fluid, a certain amount of isolation fluid (an isolation fluid slug can be designed according to actual conditions of the mine), and a water-soluble macromolecule B base fluid are pumped into the formulation in sequence; when macromolecules A and B are mixed or contacted with each other, they are assembled under the drive of an extremely strong hydrogen bonding effect and quickly constructed in-situ to form a nano-microscale spherical dispersion. The nano-microspheres have a certain fluidity control ability and excellent fluid flow diversion performance, which significantly improves a fluid absorption profile of the heterogeneous formation, exhibits deep intelligent profile control and flooding, and greatly increases the crude oil recovery rate.

Mine application method for in-situ nano-microspheres to increase crude oil recovery rate

A particulate profile control agent self-adaptive to a size of formation pore throat and a preparation method thereof include: raw materials and mass fraction for preparing a system including a main agent of 0.04&#x2dc;0.2%, a nucleating agent of 0.005&#x2dc;0.01%, a crosslinking agent of 0.002&#x2dc;0.04%, an additive of 0.005&#x2dc;0.01% and water. The preparation method includes: adding the main agent in proportion to the water and evenly mixing the mixture of the main agent and the water, and then adding the additive, the crosslinking agent and the nucleating agent in turn so as to form the profile control agent; pumping the profile control agent into the formation to be reacted at a reservoir temperature for a period of time to form colloidal particles on the spot for sealing off a high-permeability layer. The present disclosure is of easy operation and low cost, low initial viscosity and good injectivity.

Particulate profile control agent self-adaptive to size of formation pore throat and preparation method thereof

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Chengdu, China

Fayang Jin