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Fluorescence-free anti-collapse agent applied to drilling fluid

A non-fluorescent, anti-slump agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of increased drilling fluid viscosity, high fluorescence level, inconvenient use, etc., and achieve the effect of retarding pressure

Inactive Publication Date: 2015-02-04
SHAANXI ALLIANCE LOGISTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the more effective bitumen-based plugging anti-slump agent is inconvenient to use in exploratory wells because of its high fluorescence level
Therefore, domestic and foreign attach great importance to the development of new non-fluorescence and high-efficiency anti-slump agents. The polyvinyl alcohol-based film-forming anti-slump agents developed in recent years have strong anti-slump ability and no fluorescence problem, but there is viscosity increase in the field application process. Negative effects, which often cause a sharp increase in drilling fluid viscosity, seriously affect the popularization and application of polyol anti-slump agents

Method used

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  • Fluorescence-free anti-collapse agent applied to drilling fluid
  • Fluorescence-free anti-collapse agent applied to drilling fluid
  • Fluorescence-free anti-collapse agent applied to drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment one: preparation.

[0013] Stir the PVA solution with a pH value of 9 in a water bath at 80°C for 10 minutes at a constant temperature, add a catalyst and a strong oxidant under stirring conditions, continue to stir at a constant temperature for 1.5 hours, then adjust the pH value to 8, and stir at a constant temperature in a water bath at 60°C for 10 minutes. Minutes, add cationization reagent under stirring condition, continue to stir at constant temperature for 3 hours, cool to room temperature; After washing 3 times and vacuum drying, a white solid granular modified polyvinyl alcohol is obtained, which is a non-fluorescent anti-slump agent for drilling fluid.

Embodiment 2

[0014] Embodiment 2: adsorption test.

[0015] The invention can generate stable blue ternary complexes with concentrated cobalt thiocyanate salt, and the color depth of the ternary complexes is different with different concentrations. According to Bill Lambert's law, the optical density at different concentrations was measured with a spectrophotometer (wavelength set at 550 nnl), and a working curve was drawn. The results are shown in Figure 1. Measure the optical density of the present invention after being adsorbed on clay particles at room temperature, find out the corresponding concentration from the working curve, and calculate the adsorption amount. When the concentration is 0.5% and 1%, the adsorption capacity is 80.8, 115.8 mg / g, and the shale rolling recovery rate is 72.72%, 85.88%, respectively. It can be seen that the higher the concentration of the present invention, the greater the adsorption capacity, the higher the recovery rate, and the stronger the ability t...

Embodiment 3

[0016] Embodiment 3: The influence of the present invention on the particle size distribution of shale.

[0017] Utilize particle size analyzer to measure the particle size distribution of the shale particles before and after the action of the present invention and shale, as figure 2 shown. From figure 2 It can be seen that with the increase of the dosage of the present invention, the particle size of the shale first increases and then gradually decreases, which is consistent with the change trend of the rolling recovery rate of the shale under the corresponding dosage. Its reason is: along with the increase of the concentration of the present invention, its adsorption on the particle surface increases, and when the concentration increases to a certain extent, because the electrostatic repulsion hinders the adsorption of the molecule of the present invention on the particle surface, the adhesion of the particle in the medium is enhanced. dispersion.

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Abstract

The invention discloses a fluorescence-free anti-collapse agent applied to a drilling fluid and relates to a composition applied to the drilling fluid. The fluorescence-free anti-collapse agent applied to the drilling fluid is modified polyvinyl alcohol. A positive nitrogen lateral group is introduced into modified polyvinyl alcohol by cationic reaction. When the concentration of modified polyvinyl alcohol is increased, the adsorbing capacity is improved; the particle diameter of hydrated mud shale particles is increased; the surface charge is increased; the shale recovery rate is correspondingly improved; the capability of suppressing the shale dispersion is improved. The fluorescence-free anti-collapse agent applied to the drilling fluid has the effects of forming films, and buffering pressure and transmission of drilling fluid filtrate.

Description

technical field [0001] The invention relates to a composition for drilling fluid. Background technique [0002] Wellbore stability is a very complex technical problem often encountered in drilling engineering. For a long time, many researchers have studied the stability of wellbore walls from the analysis of rock mechanics, or from new anti-slump agents and drilling fluid systems that inhibit shale hydration, and have achieved a series of research results. At present, the existing anti-slumping agents mainly include inorganic salts, polymers, asphalt, lignite and other low-molecular organic substances. Among them, the more effective bitumen-based plugging anti-slump agent is inconvenient to be used in exploratory wells because of its high fluorescence level. Therefore, domestic and foreign attach great importance to the research and development of new non-fluorescence and high-efficiency anti-slump agents. The polyvinyl alcohol-based film-forming anti-slump agents develope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F8/00
CPCC09K8/035C08F8/00
Inventor 刘秋丽
Owner SHAANXI ALLIANCE LOGISTICS
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