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Compact oil reservoir CO2 flooding multi-scale channeling control system and preparation method

A tight oil reservoir, multi-scale technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high concentration of switch-type dispersants, low applicable temperature, etc., and achieve good response reversibility, fluidity The effect of increased control and increased strength

Active Publication Date: 2022-01-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is currently reported that some scholars use nanoscale CO 2 Switch-type worm-like micelles for CO2 prevention in fractured low-permeability reservoirs 2 channeling, the CO 2 The blocking ability of switch-type worm-like micelles, but the applicable temperature is low (<60℃)
Some scholars have also developed micron-scale CO 2 Switch type dispersion glue, through CO 2 / N 2 The change of particle size under the atmosphere reveals the switchability, and the channeling control potential is clarified through the fracture core displacement experiment, but the CO 2 The use concentration of switch-type dispersants is relatively high, so it is urgent to develop low-cost CO 2 Switch-type temperature-resistant channeling control system to realize cross-scale CO in tight oil reservoirs 2 CO in the process of equilibrium displacement and channeling control 2 resource utilization

Method used

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  • Compact oil reservoir CO2 flooding multi-scale channeling control system and preparation method
  • Compact oil reservoir CO2 flooding multi-scale channeling control system and preparation method
  • Compact oil reservoir CO2 flooding multi-scale channeling control system and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1) Nanoscale CO 2 Preparation of responsive worm-like micelles

[0039] Dissolve N,N-dimethyl oleic acid amidopropyl tertiary amine in deionized water, prepare 200mL N,N-dimethyl oleic acid amidopropyl tertiary amine solution with a concentration of 90mmol / L, and stir at a speed of 300r / Add 18mmol sodium p-styrenesulfonate to the above solution under the condition of 1 min, stop stirring after the solution is uniform, and obtain nanoscale CO 2 Responsive worm-like micellar system.

[0040] 2) Micron level CO 2 Preparation of Responsive Dispersion Gum

[0041] 0.1g of γ-methacryloxypropyltrimethoxysilane modified hydroxylated multi-walled carbon nanotubes were uniformly dispersed in 75mL of deionized water under ultrasonic conditions, and then 20g of Acrylamide, 5g ethylenediaminoethyl methacrylate, 0.5mL ammonium persulfate (concentration 1wt%), 0.5mL sodium bisulfite (concentration 1wt%) and 1mL azobisisobutylamidine hydrochloride (concentration 1wt%) %) and 1mL ...

Embodiment 2

[0046] 1) Nanoscale CO 2 Preparation of responsive worm-like micelles

[0047] Dissolve N,N-dimethyl oleic acid amidopropyl tertiary amine in deionized water, prepare 200mL N,N-dimethyl oleic acid amidopropyl tertiary amine solution with a concentration of 70mmol / L, and stir at a speed of 500r / Add 14 mmol sodium oleate to the above solution under the condition of 1 min, stop stirring after the solution is uniform, and obtain nano-scale CO 2 Responsive worm-like micellar system.

[0048] 2) Micron level CO 2 Preparation of Responsive Dispersion Gum

[0049] 0.07g of γ-methacryloxypropyltrimethoxysilane-modified hydroxylated multi-walled carbon nanotubes were uniformly dispersed in 70mL of deionized water under ultrasonic conditions, and then 20g of Acrylamide, 8g ethylenediaminoethyl methacrylate, 0.6mL ammonium persulfate (concentration 1wt%), 0.6mL sodium bisulfite (concentration 1wt%) and 1.2mL azobisisobutylamidine hydrochloride (concentration 1wt%) and 0.2gN, N-methy...

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Abstract

The invention discloses a dense oil reservoir CO2 flooding multi-scale channeling control system and a preparation method; the dense oil reservoir CO2 flooding multi-scale channeling control system comprises a nanoscale CO2 responsive wormlike micelle system and a micron-scale CO2 responsive dispersion adhesive, wherein the nanoscale CO2 responsive wormlike micelle system is prepared by stirring a CO2 responsive monomer and an organic counter ion monomer in water; the micron-sized CO2 responsive dispersion adhesive is prepared by cross-linking acrylamide, a responsive monomer and a silane coupling agent modified hydroxylated multi-walled carbon nanotube as raw materials in water. The dense oil reservoir CO2 flooding multi-scale channeling control system has high mobility control ability in the CO2 displacement process, and high-strength carbon nanotubes are introduced into the micron-sized CO2 responsive dispersion glue, so that the strength and long-term stability of the dispersion glue are effectively improved, and the plugging effect on cracks is obviously enhanced. In addition, after CO2 in the system is replaced, the wormlike micelles are recovered into spherical micelles, and good response reversibility is achieved.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a tight oil reservoir CO 2 Flooding multi-scale channeling control system and preparation method. Background technique [0002] my country is rich in tight oil resources, with geological resources of about 200×108t. In the context of my country's large consumption of crude oil and the fact that conventional crude oil resources are far from meeting national needs (my country's dependence on foreign crude oil is as high as 74% in 2020), the efficient development of tight oil is very urgent. However, tight oil reservoirs have low permeability, poor pore-throat connectivity, strong microscopic heterogeneity, and almost no productivity before fracturing. Although the production capacity is obviously increased after fracturing, the water cut rises rapidly and the recovery rate is low (generally between 5% and 10%). Therefore, it is necessary to improve the production of ...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/594C09K8/88C09K8/92
CPCC09K8/594C09K8/588C09K8/887C09K8/92C09K2208/10Y02P90/70
Inventor 杜代军蒲万芬刘锐陈博文邹滨阳
Owner SOUTHWEST PETROLEUM UNIV
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