Preparation method of nano-oil recovery displacement agent NDA for construction of nano-apertures

A preparation method and oil displacement agent technology, which is applied in the field of nano oil recovery and oil displacement agent NDA preparation, can solve the problems of undeveloped theories and methods

Inactive Publication Date: 2015-09-16
CHENGDU NENGSHENGCAI SCI & TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For adsorbed oil, there is no real ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Example 1. Sandstone reservoir nano-displacement agent NDAsa

[0023] Features: Dissolving eroded sandstone. The polymer flooded oil wells first increase the content of depolymerization agent to relieve polymer plugging. The depolymerizer is no longer used in the later stage. Surfactants mainly use cationic and nonionic surfactants.

[0024] Formula: 10%-30% foam + 10%-30% solvent for dissolving polymer + 10%-20% imbibant + 10%-30% solvent for dissolving sandstone + 5%-30% latent acid + 10%-30 % neutral wetting agent.

[0025] The overall goal of preparing 0.5% nano-oil displacing agent NDA is: the foam quality is 30% to 75% after being circulated for 20 minutes by a sand mixing vehicle, a liquid dispensing vehicle or a large displacement pump; the half-life is 0.5min to 2min; Ridge stone, sodium bentonite, illite, chlorite), quartz, calcite, dolomite, feldspar, conglomerate, sandstone, siltstone, sandy mudstone, coal powder, granite and other rocks have a dissoluti...

example 2

[0026] Example 2. Carbonate reservoir nano-displacement agent NDAca

[0027] Features: Dissolves eroded carbonate rocks; high foam quality. Surfactants mainly use anionic and nonionic surfactants.

[0028] Formula: 10% to 40% foam + 10% to 20% imbibant + 10% to 30% solvent for dissolving carbonate rock + 5% to 30% latent acid + 10% to 30% neutral wetting agent.

[0029] The overall goal of preparing 0.5% nano-oil displacing agent NDA is: the foam quality is 30% to 75% after being circulated for 20 minutes by a sand mixing vehicle, a liquid dispensing vehicle or a large displacement pump; the half-life is 0.5min to 2min; Ridge stone, sodium bentonite, illite, chlorite), quartz, calcite, dolomite, feldspar, conglomerate, sandstone, siltstone, sandy mudstone, coal powder, granite and other rocks have a dissolution rate greater than 1%; Clay minerals (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, dolomite, feldspar, conglomerate, sandstone, siltstone, sandy mu...

example 3

[0030] Example 3. Nano oil displacement agent NDAsh in shale oil reservoir

[0031] Features: Dissolving shale, good imbibition and wettability.

[0032]The overall goal of preparing 0.5% nano-oil displacing agent NDA is: the foam quality is 30% to 70% after being circulated for 20 minutes by a sand mixing vehicle, a liquid dispensing vehicle or a large displacement pump; the half-life is 0.5min to 2min; Ridge stone, sodium bentonite, illite, chlorite), quartz, calcite, dolomite, feldspar, conglomerate, sandstone, siltstone, sandy mudstone, coal powder, granite and other rocks have a dissolution rate greater than 1%; Clay minerals (kaolinite, sodium bentonite, illite, chlorite), quartz, calcite, dolomite, feldspar, conglomerate, sandstone, siltstone, sandy mudstone, coal powder, granite and other rocks have a dissolution rate greater than 1%; nano-pore expansion 20%-100%; anti-swelling rate 70%-150%; residue amount 0mg / L-200mg / L; imbibition flooding efficiency 5%-20%; Amott-H...

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Abstract

Belonging to the technologies of oil reservoir reserve and yield increase and oil recovery improvement, the invention provides a preparation method of a nano-oil recovery displacement agent NDA for construction of nano-apertures. The nano-oil displacement agent is characterized in that: the nano-oil displacement agent is prepared according to the underground rock components, oil-water components, permeability contrast, stratum temperature and pressure, and is used for dissolving polymer and removing polymer flooding formed blocking; air foams reduce the flow rate of mid-high permeability apertures to displace remaining oil; an imbibition agent enters nano-apertures rapidly; the solvent dissolving rocks and stratum generated latent acid construct and enlarge nano-apertures and micrometer apertures in dense base rock to enhance the adsorbed oil desorption speed; a neutral wetting agent enables the adsorbed oil to break away from the rock wall surface so as to form oil flow; through combined action, the diffusion speed and seepage velocity are enhanced, and the reserve and yield are increased. The nano-oil displacement agent can displace mid-high permeability, dense low permeation remaining oil, and also can output the adsorbed oil in base rock nano-apertures.

Description

Technical field: [0001] The invention belongs to the technology of increasing storage, increasing production and improving oil recovery of oil reservoirs, and in particular provides a preparation method of nanometer oil recovery and displacement agent NDA for building nanopores and slits. [0002] Note: Dissolution refers to the physical process in which a solute is dispersed in a solvent to become a solution. technical background: [0003] The existing petroleum geology and petroleum engineering are all petroleum engineering based on seepage. Existing petroleum geology and petroleum engineering only consider the reservoirs with porosity greater than the lower limit that can seepage. Oil and gas reservoirs in China are generally low and ultra-low permeability. Whether it is low permeability, ultra-low permeability, medium permeability or high permeability reservoirs, the permeability difference is very large. Conventional oil displacement agents can drive out part of the ...

Claims

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Application Information

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IPC IPC(8): C09K8/524C09K8/518C09K8/58
Inventor 冯文光冯卓冯妍冯博
Owner CHENGDU NENGSHENGCAI SCI & TECH DEV CO LTD
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