Method for synthesizing base underground crosslinked thickening agent

A thickening agent and base technology, which is used in the synthesis of base underground cross-linking thickeners

Inactive Publication Date: 2010-12-15
NANTONG KEYI CHEM
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The previous technology is no longer applicable, how to effectively block water in the presence of strong alkali? It is our ultim

Method used

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Embodiment 1

[0033] The weight of each monomer and water is prepared according to the following ratio: AM: AA: AMPS: NVP: H 2 O=20:8:10:10:52

[0034] Preparation of the solution: Add 300g of distilled water to a 2000ml beaker, add 80g of AA monomer and 100g of AMPS monomer, add 63.7g of solid sodium hydroxide (neutralization degree 100%) for neutralization, pay attention to temperature control, do not exceed 40°C, and Properly cool down to avoid excessive temperature; add AM monomer 200g, NVP monomer 100g, add distilled water 156.3g, stir and dissolve for 30 minutes to form a homogeneous system.

[0035] Solution adjustment: adjust the solution temperature to 15±1°C.

[0036] Polymerization of the solution: Blow nitrogen to remove oxygen for 20 minutes, add initiator V650.5g / L, V500.05g / L, ammonium persulfate 0.03g / L, sodium formaldehyde sulfoxylate 0.03g / L, Stop blowing nitrogen and seal the reactor, induce for 15-20 minutes, and observe whether there is a temperature rise. When there ...

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Abstract

The invention relates to a base underground crosslinked thickening agent, in particular to a polyacrylamide thickening agent for further revamping of oilfield stimulation after alkaline/surfactant/polymer (ASP) flooding. The thickening agent is especially suitable for profile control and water shutoff of high-water-cut and strong basic oil reservoirs with vast surfactants. The base underground crosslinked thickening agent is synthesized by four monomers including acrylamide (AM), acrylic acid (AA), 2-acrylamide-2-methyl propane sulfonate (AMPS) and vinyl pyrrolidone (NVP) by aqueous solution copolymerization. The base underground crosslinked thickening agent has the characteristics of wide applicable scope (applicable to various water-base controlling, shutoff and flooding), quick dissolution in the presence of base and surfactants, high anti-shearing capability, environment friendliness, etc.

Description

technical field [0001] The present invention relates to an oil field stimulation technology after three-element compound flooding, in particular to the synthesis of an alkali base underground cross-linking thickener, which is suitable for three-element compound oil flooding by adding polyacrylamide, alkali and surfactant at the same time Afterwards, the formation environment became highly water-cut and strongly alkaline, and the production stimulation and oil displacement technologies such as profile control and water shutoff were adopted. Background technique [0002] It is usually called primary oil recovery to exploit the energy of the oil layer; injecting water and gas into the oil layer to supplement energy to the oil layer to extract oil is called secondary oil recovery; and using chemical substances to improve the performance of oil, gas, water and rocks. , to extract more oil, known as tertiary oil recovery. Also known as enhanced oil recovery (EOR) method. [0003...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F226/10C08F2/10C09K8/588
Inventor 周万富周泉张宗雨李红唐富刚
Owner NANTONG KEYI CHEM
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