Steam-displacement ultrahigh-temperature channeling sealing agent, and preparation method and application thereof

An ultra-high temperature, steam flooding technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that the curing speed of thermosetting resin is very sensitive to temperature, the temperature resistance cannot meet the requirements of steam flooding, and foam blocking Solve the problems of low sealing strength of the agent, and achieve the effect of strong low-temperature curing ability, high strength and fast curing speed

Active Publication Date: 2016-08-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large particle size and non-selectivity of granular plugging agents, and poor permeability to formation pore throats, it is easy to cause damage to the reservoir; the price of high-temperature organic jelly is relatively high, and the curing speed of thermosetting resin is very sensitive to temperature, and the controllability is poor. Moreover, the temperature resistance cannot meet the requirements of steam flooding to seal channeling; the foam plugging agent has low plugging strength, and high temperature and high pressure steam can easily penetrate

Method used

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  • Steam-displacement ultrahigh-temperature channeling sealing agent, and preparation method and application thereof
  • Steam-displacement ultrahigh-temperature channeling sealing agent, and preparation method and application thereof
  • Steam-displacement ultrahigh-temperature channeling sealing agent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a steam flooding ultra-high temperature channeling agent. The raw materials for preparing the steam flooding ultra-high temperature channeling agent include:

[0034] Benzomelamine: 4%,

[0035] Formaldehyde aqueous solution: 12%, mass concentration is 37%,

[0036] 2-acrylamide-2-methylpropanesulfonic acid: 2%,

[0037] Diallyl phthalate: 0.2%,

[0038] Sodium persulfate: 0.2%,

[0039] The balance is sewage from Liaohe Oilfield, 40°C.

[0040] The specific preparation process of the steam flooding ultra-high temperature channeling agent is as follows:

[0041] (1) Add benzomelamine and formaldehyde aqueous solution to oilfield sewage at 40°C-60°C in sequence, fully stir and dissolve for 20-30min, and stir at a speed of 50-200r / min;

[0042] (2) Add 2-acrylamide-2-methylpropanesulfonic acid, diallyl phthalate and sodium persulfate successively to the above solution;

[0043] (3) After continuing to stir for 30 minutes, a steam flooding ul...

Embodiment 2

[0045] This embodiment provides a steam flooding ultra-high temperature channeling agent. The raw materials for preparing the steam flooding ultra-high temperature channeling agent include:

[0046] Melamine: 1%,

[0047] Aqueous solution of urotropine: 1.5%, mass concentration is 40%,

[0048] 2-acrylamide-2-methylpropanesulfonic acid: 0.5%,

[0049] Diallyl isophthalate: 0.05%,

[0050] Potassium persulfate: 0.05%,

[0051] The balance is sewage from Liaohe Oilfield.

[0052] The specific preparation process of the steam flooding ultra-high temperature channeling agent is as follows:

[0053] (1) Add melamine and urotropine to the oilfield sewage at 40°C-60°C in sequence, stir and dissolve fully for 20-30min, and the stirring speed is 50-200r / min;

[0054] (2) Add 2-acrylamide-2-methylpropanesulfonic acid, diallyl isophthalate and potassium persulfate successively to the above solution;

[0055] (3) After continuing to stir for 30 minutes, a steam flooding ultra-high t...

Embodiment 3

[0061] This embodiment provides a steam flooding ultra-high temperature channeling agent. The raw materials for preparing the steam flooding ultra-high temperature channeling agent include:

[0062] Benzomelamine: 2%,

[0063] Aqueous solution of urotropine: 6%, mass concentration is 37%,

[0064] 2-acrylamide-2-methylpropanesulfonic acid: 1%,

[0065] Diallyl phthalate: 0.1%,

[0066] Potassium persulfate: 0.1%,

[0067] The balance is sewage from Liaohe Oilfield.

[0068] The specific preparation process of the steam flooding ultra-high temperature channeling agent is as follows:

[0069] (1) Add the aqueous solution of benzomelamine and urotropine to the oilfield sewage at 40°C-60°C in sequence, fully stir and dissolve for 20-30min, and the stirring speed is 50-200r / min;

[0070] (2) Add 2-acrylamide-2-methylpropanesulfonic acid, diallyl phthalate and potassium persulfate successively to the above solution;

[0071] (3) After continuing to stir for 30 minutes, a steam f...

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Abstract

The invention provides a steam-displacement ultrahigh-temperature channeling sealing agent, and a preparation method and application thereof. The steam-displacement ultrahigh-temperature channeling sealing agent comprises the following components in percentage by weight: 1-4% of melamine substance, 0.5-5% of aldehyde and / or urotropine, 0.5-2% of 2-acrylamido-methylpropylsulfonic acid, 0.05-0.2% of plasticizer, 0.05-0.2% of persulfate and the balance of water. The steam-displacement ultrahigh-temperature channeling sealing agent has the characteristics of favorable pumpability, favorable temperature resistance, long-term effectiveness, simple preparation process, low cost and the like, has the advantages of adjustable gelling time and high sealing, plugging capacity and wide oil reservoir variety applicability, can not easily pollute the stratum, can enter the deep stratum, and effectively solves the production problems of nonuniform steam suction cross section, steam channeling among wells and the like in the steam-displacement oil reservoir.

Description

technical field [0001] The invention belongs to the technical field of oil field development, and in particular relates to a steam flooding ultra-high temperature channeling agent and its preparation method and application. Background technique [0002] Due to the difference in permeability between layers and within layers, after many years of steam flooding, there has been a contradiction between vertical and horizontal effects, and even serious steam channeling between wells. Injected oil wells, the best solution is chemical plugging control technology. [0003] At present, the ultra-high temperature channeling agents for steam flooding mainly include conventional cement, rubber powder, slag powder, fly ash, bark powder and other granular blocking agents, high-temperature organic jelly or resin blocking agents, and foam blocking agents. Due to the large particle size and non-selectivity of granular plugging agents, and poor permeability to formation pore throats, it is ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08G12/32C08F220/58C08F222/26C09K8/46
CPCC08F220/58C08F220/585C08G12/32C08G81/024C09K8/46C08F222/26
Inventor 陈小凯郑健张景鑫曾双红刘靖炜王浩龙华李瑞马昌明王磊匡旭光石磊曾文波赵志辉李超
Owner PETROCHINA CO LTD
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