Imbibition agent applied to low-permeability reservoir imbibition oil recovery and preparation method thereof

An imbibant and low-permeability technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing oil production costs, achieve the effects of small particle size, high surface hydroxyl content, and good application prospects

Inactive Publication Date: 2017-09-29
LANGFANG BRANCH INST OF RES INST OF GASOLINEEUM EXPLORATION & DEV OF PETROCHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current environment of low oil prices at home and abroad, the use of surfactants as osmotic agents will undoubtedly increase the cost of oil recovery

Method used

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  • Imbibition agent applied to low-permeability reservoir imbibition oil recovery and preparation method thereof
  • Imbibition agent applied to low-permeability reservoir imbibition oil recovery and preparation method thereof
  • Imbibition agent applied to low-permeability reservoir imbibition oil recovery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Modified nano-SiO 2 preparation:

[0025] (1) Selected nano-SiO 2 The basic parameters are shown in Table 1; after infrared spectrum analysis, nano-SiO 2 There are a large number of hydroxyl groups and unsaturated residual bonds on the surface, which deviates from the stable silicon-oxygen structure; the nano-SiO2 is measured by the Omnisorp100CX specific surface and porosity analyzer 2 Its surface contains many nanoscale micropores with a porosity of 0.611ml / g. Weigh 15g nano-SiO 2 Place in a constant temperature box and dry at 101°C to remove adsorbed water.

[0026] Table 1 Nano-SiO used 2 Basic parameters

[0027]

[0028] (2) The dried nano-SiO 2 Disperse in 300ml of absolute ethanol, stir at a high speed of 4000r / min for 1h, and make an emulsion with a concentration of 5%;

[0029] (3) According to nano-SiO 2 Add the modifier dichlorodimethylsilane at a feed ratio of 1% to 7% by mass, and azeotropically reflux at a temperature of 80°C for 3 hours;

...

Embodiment 2

[0054] (1) The basic parameters of the selected nano-silica are shown in Table 6. According to infrared spectrum analysis, there are a large number of hydroxyl groups and unsaturated residual bonds on the surface of nano-silica, which deviates from the stable silicon-oxygen structure; Omnisorp100CX specific surface and pores The surface of the nano-silica contains many nano-scale micropores as measured by the rate analyzer, and its porosity reaches 0.611ml / g. Weigh 15g of nano silicon dioxide and place it in a constant temperature box to dry at 101°C to remove the adsorbed water.

[0055] Table 6 Nano-SiO used 2 Basic parameters

[0056]

[0057] (2) According to the feed ratio of 5% mass fraction of absolute ethanol, the dried nano-SiO 2 Disperse in 300ml of absolute ethanol, stir at a high speed of 4000r / min for 1h, and make an emulsion with a concentration of 5%;

[0058] (3) According to nano-SiO 2 Add the modifier dichlorodimethylsilane at a feed ratio of 1% to 7% ...

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Abstract

The invention discloses an imbibition agent applied to low-permeability reservoir imbibition oil recovery, and aims to overcome the defects of an existing surfactant imbibition agent. The imbibition agent is organochlorosilane modified nano-SiO2. The invention further provides a method for preparing the imbibition agent. The organochlorosilane modified nano-SiO2 has a great number of hydrophilic hydroxyl functional group, and also has partial oleophilic organic functional group. The organochlorosilane modified nano-SiO2 is adsorbed to an oil wet surface to generate wettability alteration to reach a reservoir stratum, so that the aim of changing the wettability of the reservoir stratum can be achieved. Furthermore, the organochlorosilane modified SiO2 can exist on an oil-water interface to change the property of crude oil, so that the fluidity and imbibition efficiency of crude oil can be improved. The modified nano-SiO2 is low in cost and wide in source, has a relatively good effect for modifying the interface of the reservoir stratum, can be widely applied to the field of triple oil recovery, and has an excellent application prospect.

Description

technical field [0001] The invention relates to the field of reservoir oil production engineering, in particular to an imbibition agent for low-permeability oil reservoir imbibition oil recovery. Background technique [0002] The proven reserves of low-permeability oil and crude oil production are increasing year by year. As of 2010, the cumulative low-permeability oil reserves of China National Petroleum Corporation (CNPC) accounted for 40.6% of the total proven oil reserves, and 73% of the new oil reserves in the past three years for low permeability reserves. Among the remaining resources of national petroleum prospects, low-permeability reserves also account for 54% of the total remaining resources. Low-permeability reserves have become the main body of production capacity construction in new areas and production increase in oilfields. [0003] Low-permeability reservoirs have the characteristics of low reservoir porosity, poor permeability, and poor fluid flow capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58
CPCC09K8/58C09K2208/10
Inventor 孙灵辉刘卫东田浩萧汉敏丛苏男
Owner LANGFANG BRANCH INST OF RES INST OF GASOLINEEUM EXPLORATION & DEV OF PETROCHINA
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