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Method for detecting cationic degree of synthetic polymer for drilling fluid

A technology for synthesizing polymers and cationic degrees, which is applied in the field of analytical chemistry, can solve the problems of low accuracy of cationic degree measurement results, achieve the effect of weakening ion-pair repulsion, improving accuracy, and avoiding low measurement results

Active Publication Date: 2019-03-05
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is susceptible to external interference such as inorganic potassium ions and ammonium ions and the influence of the molecular structure itself (mainly anionic sulfonic acid groups and carboxylic acid groups), resulting in low accuracy in the determination of cationicity.

Method used

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  • Method for detecting cationic degree of synthetic polymer for drilling fluid
  • Method for detecting cationic degree of synthetic polymer for drilling fluid
  • Method for detecting cationic degree of synthetic polymer for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Weigh 1.00g of acrylamidopropyltrimethylammonium chloride-acrylamide (AMPTA-AM) binary cationic polymer sample, soak in 100mL 90% ethanol solution for 2h, wash to remove small molecular ammonium ions and other For water-soluble impurities, filter with a layer of medium-speed qualitative filter paper, and wash the sample on the surface of the filter paper three times with 30 mL of 90% ethanol to remove residual impurities on the surface of the sample, dry at 105±3°C for 2 hours, cool to room temperature, and set aside .

[0060] (2) Weigh the purified sample m 1 =0.2000g (accurate to 0.0001g), add 8.0g of sodium chloride and distilled water to fully dissolve.

[0061] Then add 1mL hydrogen peroxide and 2-3 drops of dilute hydrochloric acid (volume ratio 1:1), heat at 80°C for 10min, cool to room temperature after fully degraded, and then adjust and control with acetic acid-sodium acetate buffer solution with a pH value of 3.6 pH value to 3.0 ~ 4.0, and then accurat...

Embodiment 2～4

[0070] The measurement sample objects in Example 1 were changed to binary copolymers of different cationic monomers and terpolymers and tetrapolymers containing anionic groups, and other test conditions were controlled to be unchanged. The measurement results are shown in Table 3 below.

[0071] According to the above test method, the theoretical cationic degree and the measured cationic degree of a series of polymers with different anionic group contents synthesized in the laboratory are compared, and the query chart of the correction factor of the cationic degree is summarized through data analysis.

[0072] Table 3 The results of the cationic degree measurement of different cationic polymers

[0073]

[0074] Note: DMD-AM is dimethyl diallyltrimethylammonium chloride-acrylamide binary copolymer; AMPTA-AM-AMPS is acrylamidopropyltrimethylammonium chloride-acrylamide-2- Acrylamide-2-methylpropanesulfonic acid terpolymer; AMPTA-AM-AMPS-AA is acrylamidopropyltrimethylammoniu...

Embodiment 5

[0110] Example 5 Molecular structure influence test on the determination of cationic degree

[0111] Zwitterionic polymers also contain a certain amount of anion -SO 3 2- Group and -COO - group, with the increase of the molar content of anionic groups in the polymer, the determination method of sodium tetraphenylborate has a large deviation, when the polymer-SO 3 2- The group molar content is 20%, -COO - When the group molar content is 20%, the measurement deviation of the sodium tetraphenylborate method is as high as 93%. It can be seen that the sodium tetraphenylborate method has shown great incompatibility. For this reason, the application uses a certain amount of chemical treatment agent (salts) to carry out charge shielding to anionic groups, remove or weaken the repulsion of anionic groups to tetraphenylborate ions, that is, add an appropriate amount of inorganic salt (NaCl) in water Dissolve the polymer, and use the same ion effect and the flocculation of inorganic...

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Abstract

The invention provides a method for detecting a cationic degree of a synthetic polymer for drilling fluid. The method includes: purifying a cationic polymer sample by ethanol solution, and dissolvingthe purified sample in sodium chloride water solution to obtain sample water solution; controlling apparent viscosity of 1wt% of the sample water solution to be smaller than or equal to 10mPa s; adopting a sodium tetraphenylborate back titration method for detecting to obtain the total content of quaternary ammonium salt cations and potassium ions; adopting an ashing method to detect to obtain thecontent of the potassium ions, calculating a difference value between the total content of quaternary ammonium salt cations and the potassium ions and the content of the potassium ions to obtain an actually measured cationic degree. Aiming at the defect of difficulty or low accuracy in cationic degree determination due to external interference and polymer molecular structural influences, the method for detecting the cationic degree of the synthetic polymer for drilling fluid is improved to achieve high accuracy and applicability.

Description

technical field [0001] The invention relates to the technical field of analytical chemistry, in particular to a method for detecting the cationic degree of a synthetic polymer used in drilling fluid. Background technique [0002] Compared with anionic drilling fluid treatment agents, drilling fluid treatment agents containing cationic groups (such as quaternary ammonium salts) are effective in inhibiting shale hydration, stabilizing well walls, protecting oil and gas layers, increasing drilling speed, reducing energy consumption and comprehensive drilling performance. The cost and other aspects have shown significant advantages, and it has become one of the research hotspots of oilfield chemists. In order to synthesize cationic polymer treatment agents, some cationic monomers that are easy to copolymerize with acrylic acid and acrylamide have been developed, such as 3-acrylamido n-propyl dimethyl ammonium chloride, 2-acrylamido ethyl dimethyl ammonium chloride, trimethylall...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/34G01N1/44
CPCG01N1/34G01N1/44G01N31/16
Inventor 黄宁孟丽艳张希红史康玲国安平
Owner 中石化石油工程技术服务有限公司
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