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Efficient composite scale inhibitor

A kind of antiscalant, high-efficiency technology, applied in the direction of scale removal and water softening, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of cumbersome preparation methods, large dosage, inadaptability, etc., and achieve applicable Wide range of performance, low cost, good stability

Inactive Publication Date: 2014-06-04
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 101508492A discloses an environment-friendly composite anti-scaling dispersant for oil field reinjection water treatment, which is better for scaling water bodies with lower concentrations of calcium, magnesium, barium and strontium ions, but the dosage is also large, and it is not suitable for High-concentration barium-strontium ion water; patent CN 101607767A discloses a neutral composite scale inhibitor for oil field reinjection water, but its preparation method is cumbersome, and the formula contains phosphine, which pollutes the environment and its use is limited

Method used

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Examples

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Effect test

example 1

[0025] Preparation of example one scale inhibitor

[0026] 1. Preparation of barium strontium scale inhibitor of terpolymer: add 1mol maleic anhydride into the reactor, dissolve it with distilled water, heat to 65°C, add 0.2-0.8 A mixture of mol acrylic acid or methacrylic acid, 0.4-0.6 mol acrylate and 0.08-0.12 mol potassium persulfate, polymerized at a temperature of 75-90°C for 2-5 hours, cooled to a light yellow transparent liquid, and then used 50% Sodium hydroxide solution adjusts pH to 7 to obtain barium strontium scale inhibitor of terpolymer.

[0027] 2. Preparation of binary copolymer calcium scale inhibitor: Add 2-5mol epoxysuccinic acid and 1mol sodium allyl sulfonate into the reactor, dissolve them in distilled water, and pour them into the solution at a temperature of 70-95°C Add dropwise the aqueous solution of 1.5-1.9mol initiator ammonium persulfate, after 0.5h the dropwise addition is completed, continue the reaction for 1.5-4.5h, cool to normal temperature...

example 2

[0029] Example 2 The effect of compound scale and antiscalant ratio changes on the scale inhibition effect of WZ simulated formation water

[0030] The terpolymer barium strontium scale inhibitor and the binary copolymer calcium scale inhibitor are respectively in mass percentage 75%: 25%, 67%: 33%, 50%: 50%, 33%: 67%, 25% %: 75% is compounded, and the scale inhibition rate of the compound scale and scale inhibitor obtained in different proportions to WZ simulated formation water is shown in Table 2. Table 1 shows the ion concentration of WZ simulated formation water.

[0031] Table 1 Concentration of WZ formation water ions

[0032]

[0033] Table 2 Scale inhibition effect of compound scale and scale inhibitors with different ratios on WZ formation water (scale inhibitor dosage 100mg / L)

[0034] Mixing ratio

75%:25%

67%:33%

50%:50%

33%:67%

25%:75%

Calcium and magnesium scale inhibition rate (%)

85.76

84.55

82.28

70.09 ...

example 3

[0038] Example 3 Scale inhibition effect of FH-11 on the water quality of Weizhou Oilfield in the western South China Sea

[0039] The water quality of Weizhou Oilfield in the west of the South China Sea is high in calcium and high in barium and strontium ions, and its ion composition is shown in Table 3.

[0040] Table 4 is the test results of FH-11 composite scale inhibitor on high-calcium and high-barium-strontium ion water in Weizhou Oilfield.

[0041] Table 5 shows the results of the scale inhibition and synergistic experiment of FH-11 composite scale inhibitor compared with a single high-efficiency barium-strontium scale inhibitor or high-efficiency calcium scale inhibitor.

[0042] Table 3 Ion concentration data of formation water in Weizhou Oilfield, western South China Sea

[0043]

[0044] Table 4 Effect of concentration change of FH-11 compound scale and antiscalant on formation water resistance and compound scale effect in Weizhou Oilfield, western South China ...

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Abstract

The invention relates to an efficient composite scale inhibitor which belongs to the technical field of industrial water treatment agent design and is characterized by compounding, by mass, 25-75% of a terpolymer barium strontium scale inhibitor and 25-75% of a binary copolymer calcium scale inhibitor, the binary copolymer calcium scale inhibitor is a copolymer of epoxy succinic acid and sodium allysulfonate, and the terpolymer barium strontium scale inhibitor is a copolymer prepared by adding acrylic acid or methacrylic acid and acrylate in maleic anhydride. The efficient composite scale inhibitor is free of phosphorus in formulation, may not cause the water body eutrophication in use, is friendly to the environment, is suitable for calcium, barium, strontium and other ion containing water body, the preparation method is simple, the cost is low, anti salt performance is good, stability is good, applicability is wide, and the scale inhibition effect is better by same dose amount compared with that of the single terpolymer barium strontium scale inhibitor or the binary copolymer calcium scale inhibitor.

Description

Technical field: [0001] The invention relates to a high-efficiency composite scale inhibitor, which belongs to the technical field of industrial water treatment agent design, and is especially suitable for water bodies containing calcium, magnesium, barium and strontium ions in oil fields that have formed composite scales. Background technique: [0002] Most of my country's onshore oilfields have entered the middle and late stages of development. With the deepening of oilfield development, the water produced by oilfields has gradually increased. The composition of oilfield produced water is complex and usually contains a variety of scaling ions, such as barium ions, strontium ions, calcium ions, sulfate radicals, bicarbonate radicals, carbonate radicals, etc. Along with the barium strontium scale, there is the possibility of calcium scale (calcium carbonate, calcium sulfate scale). This brings great difficulties to the normal production of the oil field. The scale will bloc...

Claims

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Application Information

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IPC IPC(8): C02F5/10
Inventor 马斐唐善法田磊廖辉李国麟邹玮罗均龙
Owner CHINA NAT OFFSHORE OIL CORP
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