High temperature stratum self-generating foam composition and application thereof in viscous oil exploitation

A self-generating foam and composition technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of high gas injection cost, affecting construction, and increasing injection pressure, so as to achieve enhanced oil recovery and thickening Oil recovery and the effect of improving sweep coefficient

Inactive Publication Date: 2007-03-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of mechanical gas injection is high; the speed of gas introduction is fast and difficult to control; the diameter of the generated foam is large and uneven, which affects the stability of the foam; the injection process is easy to cause gas blockage at the in

Method used

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  • High temperature stratum self-generating foam composition and application thereof in viscous oil exploitation
  • High temperature stratum self-generating foam composition and application thereof in viscous oil exploitation

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1: High-temperature formation self-generating foam composition, the components of which are as follows:

[0038] A. Urea CO (NH 2 ) 2

[0039] B. Sodium nitrite NaNO 2

[0040] C. The foaming agent is sodium dialkyl diphenyl ether disulfonate

[0041] The molar ratio of B to A is 1:2, the total mass concentration of B and A added is 20%, the added amount of the foaming agent of component C is 1% by mass, and the rest is water.

[0042] The above three components are stored separately.

Example Embodiment

[0043] Example 2: High-temperature formation self-generating foam composition, the components of which are as follows:

[0044] A. Ammonium chloride NH 4 Cl

[0045] B. Sodium nitrite NaNO 2

[0046] C. Foaming agent, sodium dialkyl diphenyl ether disulfonate

[0047] The molar ratio of B to A is 1:2.5, the total mass concentration of B and A added is 30%, the total mass concentration of the foaming agent C used is 1.5%, and the rest is water.

[0048] The above three components are stored separately.

Example Embodiment

[0049] Example 3: A high-temperature formation self-generating foam composition, the components of which are as follows:

[0050] A. The compound containing N is urea CO (NH 2 ) 2

[0051] B. The compound containing N is sodium nitrite NaNO 2

[0052] C. Foaming agent, α-olefin sulfonate with carbon chain length of C12~C24

[0053] The molar ratio of B to A is 1:1.5, the total mass concentration of B and A added is 10%, the total mass concentration of the foaming agent C used is 2.5%, and the rest is water.

[0054] Store the above components separately.

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PUM

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Abstract

The present invention is foam-generating composition for high temperature stratum and its application in exploiting thick oil, and belongs to the field of surfactant technology. Chemicals capable of producing N2, CO2 and other gas are adopted to produce gases through the reaction of A+B+C-->N2+NH3+CO2+C, where A is reductant, B oxidant and C foaming agent. The reaction is controlled by temperature, and the foam-generating composition contains also surfactant with high heat resistance, high salt tolerance, high oil/water interface activity and high foam stability. After the chemicals are injected into the stratum at normal temperature, steam is injected to initiate reaction producing stable foam in the stratum, and the foam can plug to avoid steam fleeing, raise high temperature steam sweep efficiency, raise blotter efficiency, promote crude oil to disperse and raise the thick oil exploiting rate greatly.

Description

(1) Technical field [0001] The present invention proposes a high-temperature formation self-generated foam composition and its application in heavy oil recovery, which belongs to surfactant [0002] technology field. (2) Background technology [0003] In the production of heavy oil, steam injection thermal recovery is the main production method. High-temperature steam heats the oil layer, which greatly reduces the viscosity of crude oil, and at the same time eliminates the clogging of the oil layer near the wellbore, reduces the flow resistance of crude oil and increases the production. However, due to the ubiquitous interlayer and intralayer heterogeneity of oil reservoirs, and the low density and viscosity of steam, gravity overriding and viscous fingering seriously affect its effect. The former is because the density of the steam is lower than that of the oil, so that the steam surpasses the oil wall, and the latter is because the viscosity of the steam is lower than tha...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 李英赵国庆
Owner SHANDONG UNIV
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