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High-temperature-resistant polyacrylamide gel plugging agent as well as preparation method and application thereof

A polyacrylamide, gel-like plugging agent technology, which is applied to chemical instruments and methods, drilling compositions and other directions, can solve the problem that the gel plugging agent cannot be used effectively, achieves high blocking rate, and has a simple preparation method. , the effect of long blocking time

Active Publication Date: 2020-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the existing gel plugging agent cannot be effectively applied to higher temperature and realize water plugging for a longer period of time, the purpose of the present invention is to provide a new high temperature resistant polyacrylamide gel plugging agent and its preparation method and application

Method used

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  • High-temperature-resistant polyacrylamide gel plugging agent as well as preparation method and application thereof
  • High-temperature-resistant polyacrylamide gel plugging agent as well as preparation method and application thereof
  • High-temperature-resistant polyacrylamide gel plugging agent as well as preparation method and application thereof

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Experimental program
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Embodiment approach

[0028] In the present invention, the organic chromium is preferably one or more of chromium acetate, chromium oxalate, chromium lactate, chromium propionate, chromium malonate and chromium citrate, more preferably chromium lactate. Organic acid chromium can be prepared with reference to the prior art. For the present invention, according to one embodiment, chromium (II) reacts with sodium nitrite first, and then reacts with organic acid (preferably acetic acid, oxalic acid, One or more of lactic acid, propionic acid, malonic acid and citric acid) for complexation, wherein the molar ratio of the reaction between chromium (II) and sodium nitrite is 1 / 4-1 / 3, chromium (III ) reacts with the organic acid in a complex molar ratio of 1 / 50-1 / 10, the obtained organic chromium is a dark green solution, the pH value is 4-10, and the effective content of chromium (III) is greater than 2%.

[0029] Preferably, based on the total weight of the high-temperature-resistant polyacrylamide gel p...

Embodiment 1

[0046] This example is used to illustrate the high temperature resistant polyacrylamide gel plugging agent of the present invention and its preparation method.

[0047] At room temperature, dissolve 20 grams of partially hydrolyzed polyacrylamide (viscosity-average molecular weight of 8 million, degree of hydrolysis of 8%) in 1 L of water, stir at 500 rpm until the partially hydrolyzed polyacrylamide is completely dissolved; then add 20 gram of water-soluble urea-formaldehyde resin (formaldehyde / urea molar ratio is 2.8), 20 gram of chromium acetate, 10 gram of urea and 10 gram of sodium thiosulfate and stir until all dissolve, obtain high temperature resistant polyacrylamide gel plugging agent.

[0048] The plugging performance of the high-temperature-resistant polyacrylamide gel plugging agent was tested at a temperature of 150°C and a standing time of 60 days. The results are shown in Table 1.

[0049] Among them, Darcy's principle is applied to the test of plugging performa...

Embodiment 2

[0056] This example is used to illustrate the high temperature resistant polyacrylamide gel plugging agent of the present invention and its preparation method.

[0057] At room temperature, dissolve 4 grams of acrylamide / acrylic acid / AMPS sodium salt copolymer (viscosity-average molecular weight is 25 million, degree of hydrolysis is 20%) in 1L of water, stir at 500 rev / min speed to acrylamide / acrylic acid / AMPS sodium salt copolymer dissolves completely; Add 4 grams of water-soluble urea-formaldehyde resins (formaldehyde / urea molar ratio is 2.8), 2 grams of chromium lactate, 2 grams of urea and 2 grams of isoascorbic acid successively and stir until all dissolve, obtain the present embodiment High temperature resistant polyacrylamide gel plugging agent.

[0058] Test the plugging rate of the high temperature resistant polyacrylamide gel plugging agent at 150°C / 60 days, 150°C / 75 days, 150°C / 90 days, 165°C / 60 days, 180°C / 60 days, test The method is the same as in Example 1, an...

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Abstract

The invention relates to the technical field of oil exploitation, and provides a high-temperature-resistant polyacrylamide gel plugging agent as well as a preparation method and application thereof. The high-temperature-resistant polyacrylamide gel plugging agent comprises an acrylamide polymer, water-soluble urea resin, organic chromium, a deoxidant, a urea compound and water, the urea compound has a structure shown in a formula (1) and / or a formula (2), R1 and R2 are independently selected from hydrogen or 2-propynyl; and R3, R4 and R5 are each independently selected from a group consistingof oxygen, sulfur or imino. The high-temperature-resistant polyacrylamide gel plugging agent provided by the invention is simple in preparation method, can be used for effectively plugging a steam channeling channel for a long time (30-90 days) at a relatively high temperature (150-180 DEG C), and does not break gel and dehydrate during plugging.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a high-temperature-resistant polyacrylamide gel plugging agent and its preparation method and application. Background technique [0002] Steam huff and puff is the main way of heavy oil development, it is considered as a conventional, economical and effective method, and it is widely used in heavy oil fields. With the progress of multiple rounds of huff and puff stages, water invasion and steam channeling are serious, and the water content of oil wells increases significantly, which affects the thermal recovery of heavy oil reservoirs to varying degrees, and the thermal recovery effect becomes worse. In the process of thermal recovery of heavy oil reservoirs, high water cut in oil wells has become the main problem affecting the thermal recovery effect. At present, one of the most effective ways to solve this problem is to use gel plugging agent to block the channe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/592
CPCC09K8/592
Inventor 胡晓娜祝纶宇伊卓杨金彪方昭刘希
Owner CHINA PETROLEUM & CHEM CORP