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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
  • Claims
  • Application Information

AI Technical Summary

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The previous technology is no longer applicable, how to effectively block water in the presence of strong alkali?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 ultimate goal of developing this product, to develop and produce an underground cross-linking thickener that adapts to basic conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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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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