Preparation method and application of high temperature and high salinity stabilizer for drilling fluid

A high-temperature, high-salt, drilling fluid technology, applied in the direction of sulfonate preparation, drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult product quality control and high production control requirements, and achieve easy product quality control, Improved hydrophilicity and simple preparation method

Inactive Publication Date: 2013-04-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quality of this kind of product obtained through copolymerization is not easy to control, and has high requirements for production control.

Method used

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  • Preparation method and application of high temperature and high salinity stabilizer for drilling fluid
  • Preparation method and application of high temperature and high salinity stabilizer for drilling fluid
  • Preparation method and application of high temperature and high salinity stabilizer for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 9g of sodium metabisulfite and 9g of sodium sulfite and add them to 90mL of water (the mass of sulfite to the volume percentage of water g / mL is 20%), add 6g of paraformaldehyde, and then pass nitrogen into the solution for 15 minutes. Then the solution is heated in a water bath at 60°C-80°C, condensed and refluxed, reacted under the condition of stirring for 3 hours, vacuum-dried at 60°C-70°C, and pulverized to obtain a high-temperature stabilizer. No phenol or aniline was added in this example.

[0027] The existing commonly used sulfonated drilling fluid formula is: 2.0% soil slurry, 0.1% Na 2 CO 3 , 1.0% NaOH, 6.0% SMP-2, 2.0% SPNH, 3.0% PSC-2, 2.0% SPC, 3.0% Tf-160, 2.0% SY-A07, 25.0% NaCl, 5.0% KCl. Then add 4.2g / m 3 High-density barite powder to a density of 2.3g / mL.

[0028] Take 300g of drilling fluid and add 3g of the prepared high-temperature stabilizer. After rolling at 160°C for 16 hours, compared with the reference sample without high-temperature ...

Embodiment 2

[0030] As described in Example 1, the difference is that the sulfite only adopts sodium sulfite.

[0031] Treat the sulfonated drilling fluid with the prepared drilling fluid high-temperature and high-salt stabilizer. After rolling at 160°C for 16 hours, the apparent viscosity decreases by 15% and the shear force decreases by 38% compared with the drilling fluid treated under the same conditions without adding it. , the amount of water loss under high temperature and high pressure did not change significantly.

Embodiment 3

[0033] As described in Example 1, the difference is that the paraformaldehyde is replaced by a 37% formaldehyde solution, and both have the same amount of effective formaldehyde.

[0034] Treat the sulfonated drilling fluid with the prepared drilling fluid high-temperature and high-salt stabilizer. After rolling at 160°C for 16 hours, compared with the drilling fluid treated under the same conditions without adding it, the apparent viscosity decreases by 18%, and the shear force decreases by 45%. , no significant change in high temperature and high pressure dehydration.

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Abstract

The invention provides a preparation method for a high temperature and high salinity stabilizer for drilling fluid, which comprises the following steps of: (1) adding sulfite into water to prepare solution, and adding aldehyde into the solution; (2) adding phenol or aniline into the solution, ensuring that the percentage of the mass of the phenol or aniline to the volume of water of g / mL is 0 to 2.5 percent, and introducing nitrogen into the solution; (3) heating the solution in a water bath, condensing and refluxing, and performing reaction for 3 hours with stirring; and (4) drying the solution in vacuum, and crushing the obtained powder to obtain the high temperature and high salinity stabilizer for the drilling fluid. The preparation method is simple, the product quality is easy to control, and after the prepared stabilizer is added into the drilling fluid, the stabilizer is reacted with several common drilling fluid additives at certain formation temperature and the hydrophilia isimproved, so that the crosslinking, degradation and aggregation of organic matters in the drilling fluid under the conditions of high temperature and high salinity are inhibited, and the effect of improving the high temperature stability of the drilling fluid is obvious.

Description

technical field [0001] The invention relates to a preparation method of a stabilizer for drilling fluid and an application of the stabilizer, belonging to the technical field of stabilizers for oilfield drilling fluid. Background technique [0002] With the gradual increase of drilling depth in oil fields, more high-temperature, high-salt and various complex formations will be drilled, which puts forward higher requirements for drilling fluids and promotes the continuous development of drilling fluid technology. Practice has shown that the performance of drilling fluid plays a very important role in ensuring the safe and rapid drilling of deep and ultra-deep wells, and the performance of drilling fluid is realized by adding various treatment agents, which requires the preparation of better performance additive. [0003] The successful development of polymer series drilling fluids in the 1980s changed the domestic high temperature resistant drilling fluid system from trisulf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/32C07C309/08C07C309/24C09K8/035
Inventor 孙德军张敬春孙明波李璐
Owner SHANDONG UNIV
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