Barium strontium calcium scale remover and preparation method thereof

A descaling agent and formula technology, applied in the field of oilfield chemical additives, can solve the problems of low descaling efficiency, corrosiveness of metal pipes, secondary pollution of natural environment, etc., and achieve high descaling efficiency, no corrosion of equipment, natural Environmentally harmless effect

Inactive Publication Date: 2016-11-23
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Barium sulfate, strontium sulfate, and calcium sulfate descaling agents widely used at present mainly include: acid-base descaling agents, organic phosphoric acid and lipid descaling agents, ionic liquid descaling agents, etc., which have low descaling efficiency and are harmful to metal pipes. Corrosive, secondary pollution to the natural environment and other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The formula of the descaling agent is: ethylenediaminetetraacetic acid sodium salt (EDTA-Na) is used as the metal chelating agent with a mass percentage of 30%, and OP-4, OP-15 and OP-40 ( In this embodiment, the mass ratio of the above three substances is 1:1:2, that is, the mass percentages are 5%, 5%, and 10% respectively. The above-mentioned ratio range can be adjusted according to actual use conditions.) The mass percentage is The 3% dispersant is a mixture of polyethylene wax and oxidized polyethylene wax (the mass ratio is 7:3, and the ratio range of the mass ratio can be adjusted accordingly according to the actual use), and the mass percentage is 7% hydrogen hydroxide Potassium, 40% by mass deionized water.

[0026] The preparation method of the descaling agent is as follows: first add deionized water, metal chelating agent, and potassium hydroxide into the reaction flask and stir uniformly, react at 60°C for 1 hour, add solubilizer and dispersant, stir uniformly,...

Embodiment 2

[0029] The formula of the descaling agent is: 20% by weight of the metal chelating agent aminotriacetic acid, and 10% by weight of the solubilizing agent to choose OP-9, OP-13, OP-30 (the quality of the above three substances in this embodiment The ratio is 1:1:2, and the above ratio range can be adjusted according to the actual use.) The mixture, the dispersant with 0.8% mass percentage is stearamide, the mass percentage is 10% strong alkali potassium hydroxide, the mass percentage It is 59.2% deionized water.

[0030] The preparation method of the descaling agent is as follows: first add deionized water, metal chelating agent and potassium hydroxide into the reaction flask and stir evenly, react at 60°C for 2h, add solubilizer and dispersant, stir evenly, and cool to room temperature to give a light yellow liquid.

[0031] The method of using the descaling agent is: take 10 grams of scale sample, keep the temperature at 80-90℃, keep stirring or shaking, take it out after 48h, fi...

Embodiment 3

[0033] The formula of the descaling agent is: the metal chelating agent with a mass percentage of 25% is diethylene triamine pentaacetic acid sodium salt (DTPA-Na), and the mass percentage is 15% with a solubilizer of OP-9, OP-15 (this In the embodiment, the mass ratio of the above two substances is 1:1:2, and the above ratio range can be adjusted according to the actual use.) Mixture, 0.5% by mass dispersant, select lipids, the lipids are stearin The mixture of acid monoglyceride and glyceryl tristearate (the mass ratio of the above two substances in this example is 2:1, and the above ratio range can be adjusted accordingly according to actual use), and the mass percentage is 12.5% ​​strong Alkali potassium hydroxide, deionized water with a mass percentage of 47%.

[0034] The preparation method of the descaling agent is as follows: first add deionized water, metal chelating agent, and potassium hydroxide into the reaction flask and stir evenly, react at 50℃ for 1.5h, add solubi...

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PUM

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Abstract

The invention provides a barium strontium calcium descaling agent, which comprises the following components in terms of weight percentage: 20-35% of a metal chelating agent, 10-20% of a solubilizer, 0.5-5% of a dispersant, and 5-5% of potassium hydroxide 15%, deionized water 40-60%. Compared with the prior art, the barium strontium calcium descaling agent created by the present invention has good descaling performance, can effectively remove barium sulfate, strontium sulfate, calcium sulfate and other inorganic composite scales, has high descaling efficiency, and has no harm to the natural environment , safety in use, and no corrosion to equipment, etc., have important practical significance for improving oil and gas recovery.

Description

Technical field [0001] Invention of the Invention The present invention relates to the field of oilfield chemical additives, in particular to a descaling agent for three types of inorganic composite scales, such as barium sulfate, strontium sulfate, and calcium sulfate for oilfields, and a preparation method thereof. Background technique [0002] According to recent surveys in several oil fields, about 70-80% of oil wells are under high pressure during the drilling and completion process, and barite powder needs to be used to increase the density. Among barite powder, barium sulfate, strontium sulfate, and calcium sulfate are It cannot be removed by conventional pickling methods; in addition, some oil reservoirs themselves also contain barium sulfate, strontium sulfate, and calcium sulfate. These insoluble inorganic compound scales such as barium sulfate, strontium sulfate and calcium sulfate make the oil and gas reservoirs The damage caused the formation to be blocked, the water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/528
Inventor 刘音陈世春王红科解洪祥常青靳剑霞
Owner CNPC BOHAI DRILLING ENG
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