Borehole wall stabilizing agent and preparation method thereof

A wellbore stabilizer and drilling fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as adverse effects, large dosage, and single effect, and achieve excellent operability and increase bonding Abilities, effects of vulnerability to defects

Inactive Publication Date: 2013-10-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these additives have their own shortcomings. The commonly used asphalt additives are highly toxic and have a great impact on the environment; the inorganic salt products have a single effect during use and are added in large quantities, which are easy to affect other types of drilling. The liquid treatment agent has adverse effects; the polyacrylamide salt additive is a single component, which has a certain effect on inhibiting the hydration and dispersion of mud shale, but it has insufficient anti-collapse effect on formations with micro-fractures

Method used

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  • Borehole wall stabilizing agent and preparation method thereof
  • Borehole wall stabilizing agent and preparation method thereof
  • Borehole wall stabilizing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The well wall stabilizer has the following components in weight percent: 21% isophorone diisocyanate; 48% polypropylene glycol; 13% dimethylol propionic acid; 18% dopamine hydrochloride.

[0047] The preparation method of above-mentioned well wall stabilizer is as follows:

[0048]Select polypropylene glycol to accurately measure isophorone diisocyanate and polypropylene glycol according to the above weight percentage, place them in a reactor with N,N-dimethylformamide (DMF) as the solvent, and control the reaction temperature between 75-80°C , the reaction time is 4h, and N is passed through during the reaction 2 , the rotation speed of the synthesis process is maintained at 200 rpm. After the isocyanate-containing polyurethane is synthesized, the above weight percentage of dimethylol propionic acid (DMPA) is added for chain extension. The reaction temperature is 80-85 ° C, and the reaction time is For 5h, the reaction process passes through N 2 , stirring at a low s...

experiment example 2

[0054] Raw materials calculated by weight percentage: 18% isophorone diisocyanate; 60% polypropylene glycol; 8% dimethylol propionic acid; 14% dopamine hydrochloride.

[0055] Select polypropylene glycol, accurately measure isophorone diisocyanate and polypropylene glycol according to the above weight percentage, place them in a reactor with DMF as the solvent, control the reaction temperature between 75-80°C, and the reaction time is 4h. During the reaction Pass N 2 , the rotation speed of the synthesis process is maintained at 200 rpm. After the isocyanate-containing polyurethane is synthesized, the above weight percentage of dimethylol propionic acid (DMPA) is added for chain extension. The reaction temperature is 80-85 ° C, and the reaction time is For 5h, the reaction process passes through N 2 , stirring at a low speed of 250 rpm, the prepared solution is colorless transparent viscous liquid, the obtained solution is precipitated with deionized water for 3 times, washed...

Embodiment 3

[0061] Raw materials calculated by weight percentage: 25% isophorone diisocyanate; 38% polypropylene glycol; 15% dimethylol propionic acid; 22% dopamine hydrochloride.

[0062] Select polypropylene glycol, accurately measure isophorone diisocyanate and polypropylene glycol according to the above weight percentage, place them in a reactor with DMF as the solvent, control the reaction temperature between 75-80°C, and the reaction time is 4h. During the reaction Pass N 2 , the rotation speed of the synthesis process is maintained at 200 rpm. After the isocyanate-containing polyurethane is synthesized, the above weight percentage of dimethylol propionic acid (DMPA) is added for chain extension. The reaction temperature is 80-85 ° C, and the reaction time is For 5h, the reaction process passes through N 2 , stirring at a low speed of 250 rpm, the prepared solution is colorless transparent viscous liquid, the obtained solution is precipitated with deionized water for 3 times, washe...

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Abstract

The invention specifically relates to a borehole wall stabilizing agent capable of plugging and reinforcing borehole wall rocks, which belongs to the field of oilfield chemistry. The borehole wall stabilizing agent comprises, by weight, 15 to 30% of isophorone diisocyanate, 25 to 60% of polypropylene glycol, 5 to 20% of dimethylolpropionic acid and 10 to 30% of dopamine hydrochloride. The borehole wall stabilizing agent provided by the invention is capable of plugging and cementing micro-cracks near a borehole wall, reducing permeability of shale and bonding with the shale on the borehole wall to form a compound which can harden the borehole wall; molecules of the borehole wall stabilizing agent have a small size, are easy to diffuse and can penetrate into the shale, so bonding among the shale is benefited and bonding capability is enhanced; the borehole wall stabilizing agent is convenient to use, has excellent operation performance, can be cured through heating or at room temperature and meets environmental requirements during outdoor drilling operation; and due to no side reaction during curing, a bonding layer hardly has defects.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a well wall stabilizer which has a plugging and reinforcing effect on well wall rocks, and is mainly used in drilling fluids to quickly form a "bionic plugging agent" on the well wall rocks during the drilling process. Shell", so that it has the effect of sealing and strengthening the well wall rock, forming a firm and dense artificial well wall. Background technique [0002] The wellbore stability problem refers to the instability of the wellbore due to the interaction between shale and mud, drilling operations and geological factors. This is a very complicated worldwide problem in drilling engineering. [0003] Borehole wall instability is mainly caused by two factors: one is that the mud density is too low, and the pressure of the mud liquid column cannot support the unstable bottom; The shale pores produce a pressure penetration effect, which increases the water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035
Inventor 侯影飞郭宁杨冲张金霞谷雅雅孔瑛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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