Environment-friendly multifunctional scale inhibitor and preparation method and application thereof

A kind of antiscalant and multifunctional technology, which is applied in the field of environment-friendly multifunctional antiscalant and its preparation, can solve the problems of polluting the environment, stopping production of oil and gas wells, and stuck oil pumps, etc., and achieves the effect of no pollution to the environment

Active Publication Date: 2018-11-06
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, oilfield reinjection water, fracturing water, and formation water all contain different scaling ions such as calcium, magnesium, strontium, and barium. Due to the thermodynamic instability and chemical incompatibility of water, the interaction of scaling ions will produce Unstable, easily precipitated substances, such as barium (strontium) sulfate, calcium carbonate, calcium sulfate, etc.
These sediments accumulate on the surface of the oil casing and various equipment and will scale, often causing the oil pump to be stuck, the annulus between the well pipe and the sucker rod to be blocked, and the inner diameter of the gathering and transportation pipeline to decrease sharply. It may even cause problems such as severe blockage of equipment and formations, which great

Method used

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  • Environment-friendly multifunctional scale inhibitor and preparation method and application thereof
  • Environment-friendly multifunctional scale inhibitor and preparation method and application thereof
  • Environment-friendly multifunctional scale inhibitor and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] An environment-friendly multifunctional antiscalant, consisting of the following raw materials in weight percentage: 65% non-phosphorus chelating agent, 10% natural polymer, 5% scaling inhibitor, 0.3% dodecyl dimethyl betaine, Polyhexamethyleneguanidine hydrochloride 0.1%, water 19.6%; Wherein, described phosphorus-free chelating agent is the mixture of polyepoxysuccinic acid and polyacrylic acid that mass ratio is 11:2; Described natural polymer is wood Sulfonate; the scale inhibitor is a sulfonic acid copolymer, specifically acrylic acid / 2-acrylic acid amine-2-methylpropanesulfonic acid binary copolymer;

[0020] The preparation method of the environment-friendly multifunctional scale inhibitor is as follows: add water, phosphorus-free chelating agent, natural polymer, scaling inhibitor, dodecyl dimethyl betaine, polyhexamethylene Guanidine hydrochloride, then stirred and reacted at 30°C for 3h.

Embodiment 2

[0022] An environment-friendly multifunctional antiscalant, consisting of the following raw materials in weight percentage: 45% non-phosphorus chelating agent, 10% natural polymer, 10% scaling inhibitor, 1% dodecyl dimethyl betaine, Polyhexamethyleneguanidine hydrochloride 0.1%, water 33.9%; Wherein, described phosphorus-free chelating agent is the mixture of polyepoxysuccinic acid and polyaspartic acid that mass ratio is 4:5; The substance is chitosan; the scale inhibitor is a maleic anhydride copolymer, specifically a maleic anhydride / vinyl acetate / acrylic acid terpolymer sulfonic acid copolymer.

[0023] The preparation method is the same as in Example 1.

Embodiment 3

[0025] An environment-friendly multifunctional antiscalant, consisting of the following raw materials by weight percentage: 70% of phosphorus-free chelating agent, 3% of natural polymer, 15% of scaling inhibitor, 0.5% of dodecyl dimethyl betaine, Polyhexamethyleneguanidine hydrochloride 0.5%, water 11%; Wherein, described phosphorus-free chelating agent is the mixture of polyepoxysuccinic acid and hydrolyzed polymaleic anhydride that mass ratio is 8:2; Said natural polymer The substance is carboxymethyl starch; the scale inhibitor is a sulfonic acid copolymer, specifically acrylic acid / 2-acrylamine-2-methylpropanesulfonic acid / hydroxypropyl acrylate terpolymer.

[0026] The preparation method is the same as in Example 1.

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Abstract

The invention provides an environment-friendly multifunctional scale inhibitor. The environment-friendly multifunctional scale inhibitor is prepared from, by weight, 45-70% of phosphorus-free chelating agent, 3-10% of natural polymer, 5-15% of scaling inhibitor, 0.3-1% of dodecyl dimethyl glycine betaine, 0.1-0.5% of polyhexamethylene guanidine hydrochloride and the balance water, wherein the scaling inhibitor is at least one of a sulfonic acid copolymer and a maleic anhydride copolymer. In addition, the invention also provides a preparation method and application of the scale inhibitor. A trace amount of dodecyl dimethyl glycine betaine and a trace amount of polyhexamethylene guanidine hydrochloride are added into the scale inhibitor and play the cooperative synergistic effect on scale inhibition, the finally prepared scale inhibitor has the remarkable scale inhibiting effect on three types of scale calcium carbonate, calcium phosphate and barium sulfate and is free of phosphorus andpollution to the environment and is environmentally friendly, and the problems of oil field water scaling and blockage can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an environment-friendly multifunctional scale inhibitor and its preparation method and application. Background technique [0002] In the oil field development and secondary oil recovery process, the energy of the oil layer itself will be continuously consumed, resulting in a continuous drop in oil layer pressure, a large amount of degassing of underground crude oil, an increase in viscosity, and a great reduction in oil well production. In order to maintain or increase oil layer pressure, obtain higher Oilfield water must be injected to improve oil recovery. In order to save water resources, oilfield water reinjection is usually used. In addition, in the process of oilfield exploitation, fracturing of oil and gas wells is a measure to increase production. By improving the conductivity of oil layers, the purpose of increasing production and injection can be ach...

Claims

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Application Information

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IPC IPC(8): C02F5/10C02F5/12C02F103/10
CPCC02F5/10C02F5/12C02F2103/10
Inventor 路建萍李轶沈燕宾王佳司伟周渝谢元
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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