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Scale inhibitor and preparation method thereof

A technology of anti-scaling agent and reagent, applied in the field of anti-scaling agent and its preparation, can solve the problems of adverse effects on the ecological environment of phosphorus compounds, difficult detection of concentration, single formula, etc. The effect of frequency

Active Publication Date: 2015-05-06
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
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Problems solved by technology

Phosphorus compounds in organic phosphonic acid antifouling agents will have adverse effects on the ecological environment
Whether it is a natural polymer or a synthetic polymer antiscalant, there is a limitation of a single formula, and the concentration of a trace amount of polymer antiscalant in the solution is not easy to detect

Method used

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  • Scale inhibitor and preparation method thereof

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Embodiment 1

[0043] Embodiment 1, the preparation of antifouling agent

[0044] Preparation of modified sodium polyepoxysuccinate:

[0045] (1) Add 19.6g of maleic anhydride and 16g of sulfur trioxide (analytically pure) to a 250mL four-neck flask equipped with a thermometer, condenser, constant-speed stirring device and constant-pressure dropping funnel, add 30mL of distilled water, and heat to dissolve . Under the condition of constant stirring, slowly add 5mL of sodium hydroxide solution (mass concentration: 50%) dropwise, heat, when the temperature rises to 55°C, add 0.02g of catalyst sodium tungstate, and react for 2.5h. Then the mass concentration of 30mL is 30% hydrogen peroxide aqueous solution (mass is 33.3g), controls its titration to drop in 40min, then adjusts the pH value of solution with 50% sodium hydroxide solution to be 5~7. Then continue to heat up to 70 ° C reaction, reaction 1.5h. After the reaction, 50 mL of acetone was added, stirred, allowed to stand, and precipit...

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Abstract

The invention discloses a scale inhibitor and a preparation method thereof. The scale inhibitor disclosed by the invention is composed of modified polyepoxysuccinic acid, organic phosphonate and a diluent, wherein the mass ratio of the modified polyepoxysuccinic acid to the organic phosphonate to the diluent is (1.0 to 1.5): (1.5 to 2.0): (7.0 to 7.5). The preparation method comprises the following steps: mixing the modified polyepoxysuccinic acid, the organic phosphonate and the diluent to obtain the scale inhibitor. The scale inhibitor solution disclosed by the invention has the beneficial effects that scale inhibiting effect is good and inorganic scales such as calcium, magnesium, strontium and barium are effectively prevented from being formed; the adsorption amount of the scale inhibitor solution disclosed by the invention is low; during a process of injecting the scale inhibitor solution in a stratum, a small amount of the scale inhibitor solution is only adsorbed by minerals in the stratum, so that the utilization efficiency of the scale inhibitor can be effectively increased; the scale inhibitor solution disclosed by the invention is long in acting distance, long in validity period, and capable of reducing a construction frequency to achieve the purposes of reducing a cost and improving effects.

Description

technical field [0001] The invention relates to an antiscaling agent and a preparation method thereof, which belong to the field of oil field chemical application. Background technique [0002] When the oilfield enters the development of the water cut period, due to the thermodynamic instability and chemical incompatibility of water, it often causes scaling problems in the wellbore of the oil well, the surface system and the water injection formation, which brings great harm to the production. Pipelines are clogged due to scaling, and in severe cases, oil wells are shut down or scrapped, resulting in a decrease in oil well production and economic losses. [0003] Anti-scaling agent refers to a class of chemical reagents that can inhibit the formation of scale when added to water. Since the 1930s, antifouling agents have experienced the development process from inorganic to organic, from small molecules to high molecular polymers. In recent years, organic phosphonic acid an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C02F5/14C08G65/22
CPCC02F5/10C02F5/14C08G65/22
Inventor 王珊罗刚于继飞舒福昌周定照向兴金冯桓榰林科雄
Owner CHINA NAT OFFSHORE OIL CORP
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