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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 recovery factor, a seepage-displacement type oil recovery agent and its preparation method and application in the oil recovery process, to overcome Defects of prior art low oil recovery, especially in low permeability reservoirs

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of seepage-displacement oil recovery agent

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

[0040] (2) Imbibition deoiling experiment

[0041] The seepage displacement oil recovery agent prepared by step (1) and the viscosity at 45°C is 10mPa·s, d=0.8294g / cm 3 Static imbibition deoiling experiments were carried out on rock cores saturated with Daqing crude oil. For specific operations, refer to SY / T6424-2000 "Composite Oil Displacement System Performance Test Method" and a normal pressure deoiling bottle (for example: " A self-priming instrument", which is incorporated herein by reference in its entirety). The results are sho...

Embodiment 2

[0045] (1) Preparation of seepage-displacement oil recovery agent

[0046] 0.05g sodium polyacrylate, 0.5gNaHCO 3 and NaCl mixture (NaHCO 3 : NaCl=2:1 (mass ratio)) and 0.05g sodium polyaspartate, and 99.4g clear water or Daqing formation simulated water mix uniformly to obtain 100g seepage-displacement type oil recovery agent, and the pH of the seepage-displacement type oil recovery agent The value is 7.4.

[0047] (2) Imbibition deoiling experiment

[0048] The seepage displacement oil recovery agent prepared by step (1) and the viscosity at 45°C is 10mPa·s, d=0.8294g / cm 3 Static imbibition deoiling experiments were carried out on rock cores saturated with Daqing crude oil. For specific operations, refer to SY / T6424-2000 "Composite Oil Displacement System Performance Test Method" and a normal pressure deoiling bottle (for example: " A self-priming instrument", which is incorporated herein by reference in its entirety). The results are shown in Table 2.

[0049] Table 2...

Embodiment 3

[0052] (1) Preparation of seepage-displacement oil recovery agent

[0053] 0.05g sodium polyacrylate, 0.02gNaHCO 3 and NaCl mixture (NaHCO 3 : NaCl=3:1 (mass ratio)) and 0.01g sodium polyaspartate, and 99.92g clear water or Dagang formation simulated water are mixed uniformly to obtain 100g seepage-dispelling oil recovery agent, and the pH of the seepage-displacement oil recovery agent The value is 6.8.

[0054] (2) Imbibition deoiling experiment

[0055] The seepage displacement oil recovery agent prepared by step (1) and the viscosity at 53°C are 9.9mPa·s, d=0.8603g / cm 3 Static imbibition deoiling experiment was carried out on core crude oil saturated in Dagang. For specific operations, refer to SY / T6424-2000 "Composite Oil Displacement System Performance Test Method" and a normal pressure deoiling bottle (for example: " A self-priming instrument", which is incorporated herein by reference in its entirety). The results are shown in Table 3.

[0056] table 3

[0057] ...

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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.

Description

technical field [0001] The invention relates to a composition for a seepage-displacement type oil recovery agent and a seepage-displacement type oil recovery agent containing the composition for a seepage-displacement type oil recovery agent, and belongs to the technical field of petroleum exploitation. Background technique [0002] At present, most oil fields in the world have entered the middle and late stages of exploitation. After the oil reservoir has undergone primary oil recovery and secondary oil recovery, more than 60% of the oil geological reserves still remain in the rock pores of the oil reservoir. At present, there are many tertiary oil recovery methods, and surfactants have been widely valued in tertiary oil recovery. Because the use of surfactants can reduce the interfacial tension between oil and water, and reduce the retention of residual oil in capillaries, the oil displacement efficiency is higher. Although there are many types of surfactants, due to the c...

Claims

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Application Information

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IPC IPC(8): C09K8/588E21B43/22
Inventor 张翼马德胜朱友益韩大匡王德虎
Owner PETROCHINA CO LTD
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