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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  • Summary
  • 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.

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1 Screening of Thermal Stabilizer

[0041] Prepare 5 aqueous solutions of acrylamide-2-acrylamido-2-methylpropanesulfonic acid-vinylpyrrolidone terpolymer with a mass percentage of 1%, the mass percentage of the crosslinking agent chromium acetate is 0.15%, and the crosslinking aid The agents are 0.2% resorcinol and 0.4% urotropine by mass percentage, and heat stabilizers with mass percentages of 0.02%, 0.05%, and 0.10% are added respectively: 1) thiourea; 2) thiourea and cobalt chloride ( The mass ratio is 2:1). The crosslinking solution was placed at 140°C to form a gel, and the temperature resistance effect was observed after 5 days. The thermal stability of this example is mainly evaluated by observing the dehydration of the gel (volume fraction). The effects of different thermal stabilizers on the thermal stability of the gel are shown in Table 2.

[0042] Table 2 The dehydration rate of AM-AMPS-NVP terpolymer reacted with crosslinking agent for 5 days under d...

Example Embodiment

[0045] Example 2 Screening of the concentration of acrylamide-2-acrylamido-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%, add 0.15% crosslinking agent chromium acetate and 0.2% Hydroquinone and 0.4% urotropine, 0.05% thiourea and cobalt chloride (mass ratio 2:1), respectively placed at 50 ℃, 70 ℃, 90 ℃ to gel, observe the gel state, and put them together Regularly inspect its temperature resistance in a 140°C constant temperature oven, 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 seen from Table 3 that the greater the mass percentage of the main agent acrylamide-2-acrylamido-2-methylpropanesulfonic acid-vinylpyrrolidone terpolymer, the greater the gel strength and the shorter the gel time. Taking the gel f...

Example Embodiment

[0050] Example 3 Screening of the concentration of crosslinking agent chromium acetate

[0051] Prepare the aqueous solution of acrylamide-2-acrylamido-2-methylpropanesulfonic acid-vinylpyrrolidone terpolymer with 0.8% mass percentage, add 0.2% resorcinol and 0.4% urotropine in mass percentage , 0.05% heat stabilizer (thiourea and cobalt chloride with a mass ratio of 2:1) and different mass percentages of chromium acetate cross-linking agent, respectively placed at 50 ℃, 70 ℃, 90 ℃ to gel, observe Glue state, and place it in a 140°C constant temperature oven to regularly inspect its temperature resistance. The observation results are shown in Table 4.

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

[0053]

[0054]

[0055] As shown in Table 4, the concentration of the cross-linking agent has a greater impact on the gel formation. The greater the chromium acetate concentration, the greater the gel strength and the longer the gel formation ti...

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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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