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High temperature resistant polymer gel for medium and low temperature gelation and preparation method and application thereof

A high-temperature-resistant polymer and gel-forming technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor high-temperature resistance and difficulty in gel-forming, achieve excellent gel-forming properties, and improve crude oil recovery. rate effect

Active Publication Date: 2019-03-01
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, medium and low temperature gel plugging technology is relatively mature, and high-strength gels are usually obtained by using high-priced metals as the representative cross-linking agent, but the problem is that the high-temperature resistance is poor. will degrade
High-temperature gel plugging technology has developed rapidly in recent years, usually using organic cross-linking agents represented by phenolic resins, which have good temperature resistance at high temperatures, but are generally difficult to form gels at 100 °C

Method used

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  • High temperature resistant polymer gel for medium and low temperature gelation and preparation method and application thereof
  • High temperature resistant polymer gel for medium and low temperature gelation and preparation method and application thereof
  • High temperature resistant polymer gel for medium and low temperature gelation and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The screening of embodiment 1 heat stabilizer

[0041] Prepare 5 mass percentages of 1% acrylamide-2-acrylamide-2-methylpropanesulfonic acid-vinylpyrrolidone terpolymer aqueous solution, the mass percentage of cross-linking agent chromium acetate is 0.15%, cross-linking aid Agent is mass percent 0.2% resorcinol and 0.4% urotropine, adding mass percent is respectively 0.02%, 0.05%, 0.10% heat stabilizer: 1) thiourea; 2) thiourea and cobalt chloride ( The mass ratio is 2:1). Place the cross-linking solution at 140°C to form a gel, and observe the temperature resistance effect after 5 days. The evaluation of thermal stability in this example is mainly by observing the dehydration condition (volume fraction) of the gel. The influence of different thermal stabilizers on the thermal stability of the gel is shown in Table 2.

[0042] Table 2 Dehydration rate of AM-AMPS-NVP terpolymer reacted with cross-linking agent for 5 days under different thermal stabilizers

[0043] ...

Embodiment 2

[0045]Example 2 Screening of the concentration of acrylamide-2-acrylamide-2-methylpropanesulfonic acid-vinylpyrrolidone terpolymer

[0046] Prepare an aqueous solution of acrylamide-2-acrylamido-2-methylpropanesulfonic acid-vinylpyrrolidone terpolymer with a mass percentage of 0.2%-1.0%, and add 0.15% of a crosslinking agent chromium acetate, 0.2% methane Hydroquinone, 0.4% urotropine, 0.05% thiourea and cobalt chloride (mass ratio: 2:1) were placed at 50°C, 70°C, and 90°C to form gels respectively, and the state of gelation was observed. The temperature resistance performance was regularly inspected in a constant temperature oven at 140°C, and the observation results are shown in Table 3.

[0047] Table 3 The optimal experiment of AM-AMPS-NVP terpolymer concentration

[0048]

[0049] It can be known from Table 3 that the greater the mass percentage of the main agent acrylamide-2-acrylamide-2-methylpropanesulfonic acid-vinylpyrrolidone terpolymer, the greater the gel stre...

Embodiment 3

[0050] The screening of embodiment 3 crosslinking agent chromium acetate concentration

[0051] Prepare an aqueous solution of acrylamide-2-acrylamide-2-methylpropanesulfonic acid-vinylpyrrolidone terpolymer with a mass percentage of 0.8%, adding 0.2% resorcinol and 0.4% urotropine , 0.05% heat stabilizer (thiourea and cobalt chloride with a mass ratio of 2:1) and chromium acetate crosslinking agent with different mass percentages were placed at 50°C, 70°C, and 90°C to form gels respectively, and the formation was observed. The glue state, and placed in a constant temperature oven at 140 ℃ to regularly inspect its temperature resistance performance, the observation results are shown in Table 4.

[0052] Table 4 Optimum experiment of crosslinking agent chromium acetate concentration

[0053]

[0054]

[0055] As shown in Table 4, the concentration of the crosslinking agent has a great influence on the gel formation. The greater the concentration of chromium acetate, the ...

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Abstract

The invention discloses a high temperature resistant polymer gel for medium and low temperature gelation and a preparation method and application thereof, and relates to the field of oilfield chemistry. The high temperature resistant polymer gel for the medium and low temperature gelation is prepared from a raw material comprising the following components: acrylamide-2-acrylamido-2-methylpropanesulfonic vinyl-pyrrolidone terpolymer, a heat stabilizer, a crosslinking agent, benzenediol, urotropine and water, wherein the heat stabilizer is thiourea and cobalt chloride, and the crosslinking agentis chromium acetate or zirconium acetate. The high temperature resistant polymer gel for the medium and low temperature gelation has gelation strength of G or higher at a medium and low temperature,can be stabilized for 90 days at a temperature of 140 DEG C and above, meets the operation requirements of sealing and blocking of the medium and low temperature oil reservoir steam flooding, has goodapplication prospects in the high-permeability layer sealing and blocking of the medium and low temperature heavy oil reservoir steam flooding, and can significantly improve an oil recovery ratio.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a high-temperature-resistant polymer gel formed at a medium-low temperature and a preparation method and application thereof. Background technique [0002] After nearly 60 years of drilling and production development, my country's conventional crude oil reserves have been greatly reduced, and the development of heavy oil reservoirs is becoming more and more important. Heavy oil reservoirs are usually distributed in sandstone formations with loose structure and high porosity, and high-temperature steam injection is generally used for oil displacement production. Heterogeneous sandstone reservoirs are prone to fingering and channeling, resulting in uneven steam absorption profiles and reduced steam utilization. In order to enhance the recovery of heavy oil reservoirs, plugging agents are usually injected to improve the formation structure. [0003] There are various types of plu...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L39/06C08K5/405C08K5/098C08K3/16C09K8/512C09K8/508
CPCC08J3/075C08J3/24C08J2339/06C08K3/16C08K5/098C08K5/405C09K8/5083C09K8/512
Inventor 林梅钦杨子浩冀欣宇董朝霞张娟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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