Oil well sulfate scale inhibitor as well as preparation method and application thereof

A sulfate scale and inhibitor technology, applied in wellbore/well components, drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing production efficiency, damaging reservoirs, corrosion under scale, etc., and achieves application Wide temperature range, good environmental performance, and easy biodegradation

Inactive Publication Date: 2014-06-11
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the oil well is scaled, it will damage the reservoir, block the wellbore or cause corrosion under the scale, which will seriously reduce the production efficiency and increase the production cost
[0003] The use of chemical agents to control scaling is the main measure currently used. There are already many inhibitors developed for carbonate scale, but there are few inhibitors for sulfate scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The sulfate scale inhibitor of the present embodiment contains the following components and the weight percent of each component in the inhibitor is:

[0038] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 38%;

[0039] Polyaspartic acid 30%;

[0040] Hydrolyzed polymaleic anhydride 12%;

[0041] 2-thiol imidazoline 16%;

[0042] Sodium ethylenediamine tetramethylene phosphonate 4 %;

[0043] Among them, the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is AA / AMPS purchased from Shandong Taihe Water Treatment Co., Ltd.

[0044] The preparation method of the above-mentioned sulfate scale inhibitor has the following steps: weighing each component according to weight percentage, mixing and stirring evenly.

[0045] Evaluation of the inhibitory effect of the sulfate scale inhibitor in this example: the test was carried out according to the Petroleum and Natural Gas Industry Standard of the People's Republic of China "Methods for Perf...

Embodiment 2

[0049] The sulfate scale inhibitor of the present embodiment contains the following components and the weight percent of each component in the inhibitor is:

[0050] Maleic Anhydride / Acrylic Acid / Sodium Allyl Sulfonate / Methyl Acrylate Copolymer 45%;

[0051] Polyaspartic acid 25%;

[0052] Hydrolyzed polymaleic anhydride 10%;

[0053] 2-thiol imidazoline 15%;

[0054] Sodium ethylenediamine tetramethylene phosphonate 5 %;

[0055]Among them, maleic anhydride / acrylic acid / sodium allyl sulfonate / methyl acrylate copolymer can be used according to "Synthesis and Performance Evaluation of New Barium (Strontium) Scale Inhibitor CD-1" (Journal of Chongqing Institute of Science and Technology (Natural Science) Edition), No. 3, 2009) prepared by the synthetic method disclosed.

[0056] The preparation method of the above-mentioned sulfate scale inhibitor has the following steps: weighing each component according to weight percentage, mixing and stirring evenly.

[0057] Evaluation...

Embodiment 3

[0062] The sulfate scale inhibitor of the present embodiment contains the following components and the weight percent of each component in the inhibitor is:

[0063] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 35%;

[0064] Polyaspartic acid 35%;

[0065] Hydrolyzed polymaleic anhydride 15%;

[0066] 2-thiol imidazoline 10%;

[0067] Sodium ethylenediamine tetramethylene phosphonate 5 %;

[0068] Among them, the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is AA / AMPS purchased from Shandong Taihe Water Treatment Co., Ltd.

[0069] The preparation method of the above-mentioned sulfate scale inhibitor has the following steps: weighing each component according to weight percentage, mixing and stirring evenly.

[0070] Evaluation of the inhibitory effect of the sulfate scale inhibitor in this example: the test was carried out according to the Petroleum and Natural Gas Industry Standard of the People's Republic of China "Methods for Perf...

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PUM

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Abstract

The invention discloses an oil well sulfate scale inhibitor as well as a preparation method and application thereof. The inhibitor comprises the following components in percentage by weight: 35-45 percent of polycarboxylic acid polymer, 25-35 percent of polyaspartic acid, 10-15 percent of hydrolytic polymaleic anhydride, 15-20 percent of 2-thiol imidazoline and 2-5 percent of ethylene diamine tetra-methylene phosphonic acid sodium. The inhibitor disclosed by the invention is in liquid state, has a good inhibition effect on BaSO4 and SrSO3 scales and contains low-content phosphine; the components are easy to be biodegraded and a good environmental protection performance is achieved; the application temperature range is wide; the usage temperature is as high as 100 DEG C.

Description

technical field [0001] The invention relates to an inhibitor for sulfate scale in oil wells and its preparation and application. Background technique [0002] During the production of oil wells, on the one hand, when the formation dissolves ions and the ions carried by the injected water enter the formation water, the ions in the water are incompatible and precipitate. On the other hand, when the temperature, pressure and other parameters change, the ion balance in the formation water is destroyed , so that certain substances exceed the solubility product and deposit. These deposited substances are called scales. According to the components of scales, oil well scales are divided into carbonate scales and sulfate scales. The former mainly includes CaCO 3 and MgCO 3 , the latter mainly contains BaSO 4 and SrSO 4 . When the oil well is scaled, it will damage the reservoir, block the wellbore or cause corrosion under the scale, which will seriously reduce the production eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/528E21B37/06
Inventor 任呈强刘丽郑云萍
Owner SOUTHWEST PETROLEUM UNIV
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