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Polymer injection well blocking composite depolymerizing agent and preparation method thereof

A polymer injection well plugging and depolymerization agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of construction equipment and downhole string corrosion, high polymer injection pump pressure, strong chemical oxidation, etc. , to achieve the effect of low corrosion, high safety and high degradation rate

Pending Publication Date: 2021-06-29
TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polymer flooding is currently the main technology for enhancing oil recovery in oilfields at home and abroad, but the adsorption and retention of polymers during the injection process, the incompatibility between the molecular weight of the polymer and the pore throat size of the reservoir, the migration of formation particles, bacteria and their metabolites , polymer micelles caused by inorganic substances, improper preparation and dilution of polymer solutions, etc., causing polymer gels and filter cakes to block the formation
Due to the denaturation of polymers under formation pH, temperature, salinity, etc., it is more difficult to degrade the plugging polymer gel
Further exacerbated formation clogging of polymer injection wells, resulting in high polymer injection pump pressure, failing to meet injection requirements, or even completely unable to inject polymer, had to shut down the well and stop injection, seriously affecting oilfield production
[0003] Oxidation-type plugging removers are currently the most widely used, including hydrogen peroxide, potassium permanganate, steady-state chlorine dioxide, new ecological chlorine dioxide, etc., which have strong chemical oxidation and are extremely corrosive to steel equipment and pipe strings. During the construction process, the construction equipment and downhole pipe strings are often corroded, and even the construction equipment and measure wells are completely scrapped, and the construction safety is difficult to be effectively guaranteed.

Method used

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  • Polymer injection well blocking composite depolymerizing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The polymer injection well depolymerization agent of this embodiment is made up of five components of lauryl dimethylamine betaine, potassium persulfate, sodium hydroxide, hydroxyethylidene diphosphonic acid, and water, and the specific proportion is as follows: :

[0017] Lauryldimethylamine betaine 10kg

[0018] Potassium persulfate 8kg

[0019] Sodium hydroxide 3kg

[0020] Hydroxyethylidene diphosphonic acid 2kg

[0021] 12kg of water

[0022] Add water, potassium persulfate, and sodium hydroxide into the stirred tank according to the above-mentioned amount and stir for 15 minutes, add lauryldimethylamine betaine and hydroxyethylidene diphosphonic acid in turn, and stir mechanically for 15 minutes to obtain this product.

Embodiment 2

[0024] The polymer injection well depolymerization agent of the present embodiment is made up of four kinds of components of tetradecyl dimethyl sulfopropyl betaine, ammonium persulfate, sodium hydroxide, metadiazepine, water, specifically than:

[0025] Tetradecyldimethylsulfopropyl betaine 18kg

[0026] Ammonium persulfate 12kg

[0027] Sodium hydroxide 4kg

[0028] Diazolene 5kg

[0029] 20kg of water

[0030] Add water, ammonium persulfate, and sodium hydroxide into the stirred tank according to the above-mentioned addition amount and stir for 30 minutes. After adding tetradecyldimethylsulfopropyl betaine and metadiazepine in turn, mechanically stir for 30 minutes, that is, get this product.

Embodiment 3

[0032] The polymer injection well depolymerization agent of this embodiment is composed of lauric acid diethanolamide, ammonium persulfate, sodium hydroxide, sodium benzotriazole, and water, and the specific ratio is:

[0033] Lauric acid diethanolamide 13kg

[0034] Ammonium persulfate 15kg

[0035] Sodium hydroxide 6kg

[0036] Benzotriazole Sodium 5kg

[0037] 18kg of water

[0038] Add water, ammonium persulfate, and sodium hydroxide into the stirring tank according to the above-mentioned dosage and stir for 20 minutes, then add lauric acid diethanolamide and sodium benzotriazole in sequence, and then mechanically stir for 20 minutes to obtain the product.

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Abstract

The invention discloses a polymer injection well blocking composite depolymerizing agent and a preparation method thereof. The polymer injection well blocking composite depolymerizing agent comprises 10-18 parts of an activator, 8-15 parts of a gel breaker, 3-6 parts of sodium hydroxide, 2-5 parts of a corrosion inhibitor and 12-20 parts of water. The preparation method comprises the following steps: adding water, the gel breaker and sodium hydroxide into a stirring kettle according to a mass ratio, stirring for 15-30 minutes, sequentially adding the activator and the corrosion inhibitor, and mechanically stirring for 15-30 minutes to obtain the product.

Description

technical field [0001] The invention relates to the technical field of depolymerization agents, in particular to a composite depolymerization agent for polymer injection well plugging and a preparation method thereof. Background technique [0002] Polymer flooding is currently the main technology for enhancing oil recovery in oilfields at home and abroad. However, the adsorption and retention of polymers during the injection process, the incompatibility between the molecular weight of polymers and the size of reservoir pore throats, the migration of formation particles, bacteria and their metabolites , polymer micelles caused by inorganic substances, improper preparation and dilution of polymer solutions, etc., resulting in polymer gels and filter cakes clogging formations. Due to the denaturation of polymers under formation pH, temperature and salinity, it is more difficult to degrade the plugging polymer gel. Further aggravated formation clogging of polymer injection well...

Claims

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Application Information

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IPC IPC(8): C09K8/524
CPCC09K8/524C09K2208/26
Inventor 田继光张胜甄巧玲王志宏赵东旭朱琳高志强陈颖郭永平张婧
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM