Composition for penetration-driving oil recovery agent and penetration-driving oil recovery agent

A technology of composition and auxiliary agent, which is applied in the field of seepage-displacement oil recovery agent composition and seepage-displacement oil recovery agent, and can solve the problems of low oil recovery and low oil recovery in low-permeability oil reservoirs, etc.

Active Publication Date: 2012-09-19

PETROCHINA CO LTD

8 Cites 6 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0008] In order to solve the problems of the technologies described above, the purpose of the present invention is to provide a composition for a seepage-displacement type oil recovery agent with good performance and higher re...

Abstract

The invention provides a composition for a penetration-driving oil recovery agent. The composition comprises the following components in percentage by weight: 0.5-45 percent of a main agent, 0.5-50 percent of an auxiliary agent and 5-99 percent of an inorganic alkali metal salt, wherein the main agent is polyacrylate, and comprises one or a combination of potassium polyacrylate, polyacrylate sodium, sodium polymethacrylate and ammonium polyacrylate; and the auxiliary agent is one or a combination of polyaspartic acid, polyaspartate and polyoxyethylene sorbitol anhydride mono-fatty acid ester. The invention further provides a penetration-driving oil recovery agent containing the composition for the penetration-driving oil recovery agent and a preparation method thereof and an application thereof in an oil recovery process. The penetration-driving oil recovery agent provided by the invention is prepared from simple and readily-available raw materials, has low using amount, and particularly has high recovery rate under a low penetration condition.

Application Domain

Fluid removalDrilling composition

Technology Topic

Sodium polyacrylateFatty acid ester +7

Image

Examples

Experimental program(7)
Comparison scheme(2)

Example Embodiment

[0037] Example 1

[0038] (1) Preparation of flooding oil recovery agent

[0039] 0.1g sodium polyacrylate, 0.02g NaHCO 3 And NaCl mixture (NaHCO 3 :NaCl=1:1 (mass ratio)), 0.03g sodium polyaspartate, 0.02g polyoxyethylene sorbitan monooleate, and 99.83g clean water or Daqing formation simulated water are mixed uniformly to obtain 100g flooding Type oil recovery agent, the pH value of the flooding type oil recovery agent is 6.8.

[0040] (2) Imbibition deoiling experiment

[0041] The flooding oil recovery agent prepared by step (1) and the viscosity at 45℃ is 10mPa·s, d=0.8294g/cm 3 The core saturated with Daqing crude oil was subjected to static imbibition deoiling experiment. For details, please refer to SY/T6424-2000 "Combined flooding system performance test method" and an atmospheric deoiling bottle (for example: provided by ZL201120075849.7" A self-absorption instrument", the full text is quoted here as a reference). The results are shown in Table 1.

[0042] Table 1

[0043]

Example Embodiment

[0044] Example 2

[0045] (1) Preparation of flooding oil recovery agent

[0046] Add 0.05g sodium polyacrylate, 0.5g NaHCO 3 And NaCl mixture (NaHCO 3 :NaCl=2:1 (mass ratio)), 0.05g sodium polyaspartate, and 99.4g of clear water or Daqing formation simulation water are mixed uniformly to obtain 100g of a flooding oil recovery agent, the pH of the flooding oil recovery agent The value is 7.4.

[0047] (2) Imbibition deoiling experiment

[0048] The flooding oil recovery agent prepared by step (1) and the viscosity at 45℃ is 10mPa·s, d=0.8294g/cm 3 The core saturated with Daqing crude oil was subjected to static imbibition deoiling experiment. For details, please refer to SY/T6424-2000 "Combined flooding system performance test method" and an atmospheric deoiling bottle (for example: provided by ZL201120075849.7" A self-absorption instrument", the full text is quoted here as a reference). The results are shown in Table 2.

[0049] Table 2

[0050]

Example Embodiment

[0051] Example 3

[0052] (1) Preparation of flooding oil recovery agent

[0053] Add 0.05g sodium polyacrylate, 0.02g NaHCO 3 And NaCl mixture (NaHCO 3 :NaCl=3:1 (mass ratio)), 0.01g sodium polyaspartate, and 99.92g clear water or Dagang formation simulated water are mixed uniformly to obtain 100g flooding type oil extraction agent, the pH of said flooding type oil extraction agent The value is 6.8.

[0054] (2) Imbibition deoiling experiment

[0055] The flooding oil recovery agent prepared by step (1) and the viscosity at 53°C is 9.9mPa·s, d=0.8603g/cm 3 The Dagang saturated core crude oil was subjected to static imbibition deoiling experiment. For specific operations, please refer to SY/T6424-2000 "Combined flooding system performance test method" and an atmospheric deoiling bottle (for example: provided by ZL201120075849.7" A self-absorption instrument", the full text is quoted here as a reference). The results are shown in Table 3.

[0056] table 3

[0057]

PUM

Property	Measurement	Unit
Viscosity	10.0	mPa·s
Viscosity	9.9	mPa·s

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