High-temperature-resistant high-strength gel

A high-strength, high-temperature-resistant technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of affecting the development effect of water flooding or polymer flooding, weak temperature resistance and chemical stability, and medium permeability layer sweep Low level problems, to achieve good plugging effect, good temperature resistance, long validity period

Inactive Publication Date: 2018-02-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Tertiary oil recovery is currently one of the effective measures to enhance oil recovery in domestic oilfields. During polymer flooding or subsequent water flooding after polymer injection, the heterogeneity of the formation causes the displacement solution to advance unevenly along the high-permeability layer, while the medium-permeability layer The sweep degree is low and the oil displacement effect is poor, which seriously affects the development effect of water flooding or polymer flooding
At present, commonly used plugging modifiers include inorganic and organic plugging modifiers. Inorganic plugging modifiers have good temperature resistance and high strength, but there are problems such as too fast reaction speed or large particles that cannot be injected into the formation; organic plugging modifiers have gelation time Controllable, but weak in temperature resistance and chemical stability

Method used

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Experimental program
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Effect test

preparation example Construction

[0042] The present invention also relates to a preparation method of a high-temperature-resistant high-strength gel plugging regulating system, which comprises the following steps:

[0043] (1) Add water into the container, then add polyacrylamide under stirring, for example, 500r / min-800r / min, and stir evenly;

[0044] (2) Add the enhancer, pH regulator, stabilizer and phenolic resin into the container of step (1) sequentially while stirring, and continue to stir, for example, stirring at a stirring speed of 500r / min-800r / min for 2-3h to obtain homogeneous mixture;

[0045] (3) Heating, for example, at 100°C-130°C, preferably at 100°C-120°C, to react the mixture in step (2), for example over 8 hours, to form a solidified composite mineral gel.

[0046] In one embodiment of the present invention, the water in step (1) is mineralized water.

[0047] In one embodiment of the present invention, the preparation method of the high-temperature-resistant high-strength gel plugging ...

Embodiment 1

[0057] Add 198.4g of oilfield injection water (salinity 7674mg / L) into a 300mL beaker, slowly add 0.8g of HPAM into the beaker at a stirring speed of 600r / min, and stir evenly; Add ammonium, 0.1g phosphoric acid and 0.1g thiourea into a beaker, dissolve and add 0.4g phenolic resin while stirring; adjust the stirring speed to 300r / min, and continue stirring for 2.5h to obtain a uniform mixture; pour the prepared mixture into Put it in a stoppered test tube and put it in an oven at 100°C for 24 hours to generate a temperature-resistant high-strength gel plugging agent. The plugging rate of the plugging agent obtained in laboratory experiments can reach 98%.

Embodiment 2

[0059]Add 196.3g of oilfield injection water (salinity 8350mg / L) into a 300mL beaker, slowly add 1.2g of HPAM into the beaker at a stirring speed of 600r / min, and stir evenly; Add ammonium, 0.2g phosphoric acid and 0.14g thiourea into a beaker, dissolve and add 0.6g phenolic resin while stirring; adjust the stirring speed to 300r / min, and continue stirring for 2.5h to obtain a uniform mixture; pour the prepared mixture into Put it in a stoppered test tube and put it in an oven at 110°C for 12 hours to generate a temperature-resistant high-strength gel plugging agent. The plugging rate of the plugging agent obtained in laboratory experiments can reach 98%.

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Abstract

The invention relates to a high-temperature-resistant high-strength gel. The high-temperature-resistant high-strength gel comprises the following components by mass percent (100% in total): (1) 0.2-2.0% of polyacrylamide (HPAM); (2) 0.1-1.0% of phenolic resin; (3) 0.1-0.8% of a fortifier; (4) 0.01-0.8% of a stabilizer; (5) 0.02-0.6% of a pH regulator; and (6) the balance of water. The invention further relates to a preparation method of the high-temperature-resistant high-strength gel.

Description

technical field [0001] The invention relates to a high-temperature resistant high-strength gel plugging regulating system and a preparation method thereof. Background technique [0002] Tertiary oil recovery is currently one of the effective measures to enhance oil recovery in domestic oilfields. During polymer flooding or subsequent water flooding after polymer injection, the heterogeneity of the formation causes the displacement solution to advance unevenly along the high-permeability layer, while the medium-permeability layer The sweep degree is low and the oil displacement effect is poor, which seriously affects the development effect of water flooding or polymer flooding. Among them, the gel plugging adjustment technology is widely used in improving the water absorption profile due to its simple construction process and convenient construction. At present, commonly used plugging modifiers include inorganic and organic plugging modifiers. Inorganic plugging modifiers ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/516
CPCC09K8/512C09K8/516
Inventor 汪庐山靳彦欣李荣强辛爱渊杨建清陈雷郭宏伟王昊郭娜江汇
Owner CHINA PETROLEUM & CHEM CORP
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