Unlock instant, AI-driven research and patent intelligence for your innovation.

Foaming agent composition for enhanced oil recovery of low-permeability oil reservoir and preparation method

A technology of composition and foaming agent, applied in the field of foaming agent composition, can solve the problems of low-permeability oil reservoir with low matrix, low recovery rate, easy gas channeling and the like

Active Publication Date: 2021-04-23
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the low permeability reservoir matrix is ​​low, the injected gas is easy to channel, and the injection of enhanced oil recovery liquid additives such as chemical agents is difficult, resulting in a low recovery rate. A new foaming agent is provided. Composition, the foam agent composition can be dissolved in the gas, injected together with the gas, the formation will produce foam when it meets water, and form foam to prevent gas channeling

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Foaming agent composition for enhanced oil recovery of low-permeability oil reservoir and preparation method
  • Foaming agent composition for enhanced oil recovery of low-permeability oil reservoir and preparation method
  • Foaming agent composition for enhanced oil recovery of low-permeability oil reservoir and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Long chain polyether nitrogen compound C 8 h 17 O(C 3 h 6 O) 7 (C 2 h 4 O) 3 C 2 h 4 (N(CH 3 )C 3 h 6 ) 2 N(C 3 h 7 O)(CH 3 ) preparation

[0043] a)C 8 h 17 O(C 3 h 6 O) 7 (C 2 h 4 O) 3 C 2 h 4 Synthesis of Cl:

[0044] Add C 8 h 17 O(C 3 h 6 O) 7 (C 2 h 4 O) 4 714 g (1.0 mol) of H, 149 g (1.25 mol) of thionyl chloride and 5 g of DMF were reacted at 80° C. for 10 hours. After the reaction finished, the excess thionyl chloride was distilled off under reduced pressure to obtain C 8 h 17 O(C 3 h 6 O) 7 (C 2 h 4 O) 3 C 2 h 4 Cl, yield 86%.

[0045] b)C 8 h 17 O(C 3 h 6 O) 7 (C 2 h 4 O) 3 C 2 h 4 (N(CH 3 )C 3 h 6 ) 2 N(C 3 h 6 O)(CH 3 )Synthesis:

[0046] The C synthesized in a) 8 h 17 O(C 3 h 6 O) 7 (C 2 h 4 O) 3 C 2 h 4 Add 365 grams (0.5 moles) of Cl into a four-necked flask equipped with a reflux condenser, a thermometer, and a stirrer, heat to 77°C, add 70 grams of toluene, stir well, and slowl...

Embodiment 2

[0051] 1. Long chain polyether nitrogen compound C 14 h 29 O(C 3 h 6 O)(C 2 h 4 O) 2 C 2 h 4 (N(C 3 h 7 O)C 2 h 4 ) 3 N(C 3 h 7 O) 2 preparation of

[0052] With embodiment 1, difference only is that raw material is different (C 14 h 29 O(C 3 h 6 O)(C 2 h 4 O) 3 H, thionyl chloride, triethylenetetramine, propylene oxide), preparation process is the same as embodiment 1, makes long-chain polyether nitrogen-containing compound C 14 h 29 O(C 3 h 6 O)(C 2 h 4 O) 2 C 2 h 4 (N(C 3 h 7 O)C 2 h 4 ) 3 N(C 3 h 7 O) 2 .

[0053] 2. Preparation of composition CF-2:

[0054] At 50°C and 15MPa, the 2gC 14 h 29 O(C 3 h 6 O)(C 2 h 4 O) 2 C 2 h 4 (N(C 3 h 7 O)C 2 h 4 ) 3 N(C 3 h 7 O) 2 , 1.2g of triethylene glycol was mixed with carbon dioxide in a high temperature and high pressure visible kettle with a volume of 1L for 30 minutes and mixed evenly, and no insoluble matter was observed by naked eyes.

Embodiment 3

[0056] 1. Long chain polyether nitrogen compound C 20 h 41 O(C 2 h 4 O) 3 C 2 h 4 (N(C 2 h 5 O)C 3 h 6 ) 2 N(CH 3 ) 2 preparation of

[0057] With embodiment 1, difference only is that raw material is different (C 20 h 41 O(C 2 h 4 O) 4 H, thionyl chloride, N, N-dimethyldipropylenetriamine, ethylene oxide), the preparation process is the same as in Example 1, and the long-chain polyether nitrogen-containing compound C is obtained 20 h 41 O(C 2 h 4 O) 3 C 2 h 4 (N(C 2 h 5 O)C 3 h 6 ) 2 N(CH 3 ) 2 .

[0058] 2. Preparation of composition CF-3:

[0059] At 50°C and 15MPa, the 2gC 20 h 41 O(C 2 h 4 O) 3 C 2 h 4 (N(C 2 h 5 O)C 3 h 6 ) 2 N(CH 3 ) 2 , 1.0g of ethylene glycol butyl ether, 5.0g of ethyl acetate, stirred with carbon dioxide for 30 minutes in a high temperature and high pressure visible kettle with a volume of 1L and mixed evenly, no insoluble matter was observed by naked eyes.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a foam composition for enhanced oil recovery of a low-permeability oil reservoir and a preparation method thereof, and mainly solves the problems that the low-permeability oil reservoir is low in matrix, injected gas is prone to channeling, enhanced oil recovery liquid auxiliary agents such as chemical agents are difficult to inject, and the recovery ratio is low. According to the technical scheme, the foaming agent composition comprises a long-chain polyether nitrogen-containing compound and a solubility regulator; wherein the mass ratio of the long-chain polyether nitrogen-containing compound to the solubility regulator is 1:(0-50), and the long-chain polyether nitrogen-containing compound has the following general molecular formula as shown in the specification, wherein R is C8-C40 alkyl and alkylbenzene, k is 0 or 1, m+n is a number from 0 to 30, p is an integer from 1 to 3, and R1 is C1-C4 alkylene or substituted alkylene; and R2 is H, C1-C5 alkyl or substituted alkyl and the like, so that the problems are well solved, and the foaming agent composition can be used in the enhanced oil recovery process of the low-permeability sandstone oil reservoir.

Description

technical field [0001] The invention relates to a foam composition and a preparation method for enhanced oil recovery of low-permeability oil reservoirs. Background technique [0002] Low-permeability reservoirs generally have the characteristics of poor reservoir physical properties, low porosity, low permeability, and severe heterogeneity. The initial productivity of the reservoir is low and the production declines rapidly. During water injection development, there are low water absorption capacity of water injection wells; more serious problems such as water lock, water sensitivity, and velocity sensitivity will occur during water injection, which will damage the formation; rock physical properties are poor, pore throats are small, and there is a serious Jiamin effect. These problems lead to low water injection recovery in low-permeability oilfields, a large amount of crude oil resources remain in the oil layer and cannot be better utilized, and the water injection develo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594
Inventor 何秀娟马俊伟余晓玲时维才李斌吴国英
Owner CHINA PETROLEUM & CHEM CORP