Synthesis of hyperbranched polyquaternium amino acid intercalation inhibitor and water-based drilling fluid

A technology of hyperbranched polymer and quaternary ammonium salt, which is applied in the field of oil and gas field drilling, can solve problems such as the inability to effectively suppress the instability of the wellbore, and achieve the effects of weakening electrostatic repulsion, low price, and good inhibition effect.

Pending Publication Date: 2022-04-22
SOUTHWEST PETROLEUM UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0004] Aiming at the wellbore instability problem caused by conventional inhibitors being unable to effectively inhibit shale hydration expansion, the present invention provides a synthesis method of a hyperbranched polyquaternium amino acid intercalation inhibitor, which can effectively inhibit shale formation The problem of hydration expansion, so as to achieve the purpose of stabilizing the well wall

Method used

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  • Synthesis of hyperbranched polyquaternium amino acid intercalation inhibitor and water-based drilling fluid
  • Synthesis of hyperbranched polyquaternium amino acid intercalation inhibitor and water-based drilling fluid

Examples

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Embodiment 1

[0027] The preparation of hyperbranched polyquaternium amino acid: 0.3mol3-(N-methylamino)-L-alanine is dissolved in 100ml methanol solution at normal temperature, then 3-(N-methylamino)-L -Alanine solution is placed in a closed container, under the conditions of 10°C, nitrogen atmosphere and stirring, reflux reaction for 12h, and then the reaction product is distilled under reduced pressure to obtain 3-(N-methylamino)-L-alanine Methyl ester; 0.2mol 3-(N-methylamino)-L-alanine methyl ester and 0.2mol crotonic acid enyl esters were dissolved in 100ml organic solvent respectively, to the 3-(N-methylamino)-L-alanine methyl ester solution was added dropwise with crotonate enyl ester substance solution, after the dropwise addition was completed, the temperature was raised to 20°C for reflux reaction for 8 hours, and then the hyperbranched polymer was obtained by vacuum distillation. Amine: Dissolve 0.1mol of hyperbranched polyamine in 100ml of organic solvent, dissolve 0.1mol of al...

Embodiment 2

[0029] The preparation of hyperbranched polyquaternium amino acid: 0.3mol3-(N-methylamino)-L-alanine is dissolved in 100ml methanol solution at normal temperature, then 3-(N-methylamino)-L -Alanine solution is placed in a closed container, under the conditions of 20°C, nitrogen atmosphere and stirring, reflux reaction for 15h, and then the reaction product is distilled under reduced pressure to obtain 3-(N-methylamino)-L-alanine Methyl ester; 0.2mol 3-(N-methylamino)-L-alanine methyl ester and 0.2mol crotonic acid enyl esters were dissolved in 100ml organic solvent respectively, to the 3-(N-methylamino)-L-alanine methyl ester solution was added dropwise with crotonic acid enyl ester substance solution, after the dropwise addition was completed, the temperature was raised to 30°C for reflux reaction for 10 hours, and then the hyperbranched polymer was obtained by vacuum distillation. Amine: Dissolve 0.1mol of hyperbranched polyamine in 100ml of organic solvent, dissolve 0.1mol ...

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Abstract

The invention discloses synthesis of a hyperbranched polyquaternium amino acid intercalation inhibitor and a water-based drilling fluid. The hyperbranched polyquaternary ammonium salt amino acid intercalation inhibitor is prepared by mixing hyperbranched polyquaternary ammonium salt amino acid and water, wherein the mass ratio of the hyperbranched polyquaternary ammonium salt amino acid in the drilling fluid is 0.5%-5%. Synthetic raw materials of the hyperbranched polyquaternary ammonium salt amino acid are carboxylic acid substances containing multiple amino groups and crotonic acid alkenyl ester substances, and an end capping reagent is one of allyltrimethylammonium and allyltriethylammonium. The drilling fluid comprises the hyperbranched polyquaternary ammonium salt amino acid provided by the invention. The drilling fluid can effectively inhibit shale hydration expansion. The shale intercalation inhibitor prepared from the hyperbranched polyquaternary ammonium salt amino acid provided by the invention is non-toxic and harmless and is easier to combine with a clay layer with negative electricity, and the inhibition performance of the shale intercalation inhibitor is obviously improved compared with that of similar intercalation inhibitors.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to the synthesis of a hyperbranched polyquaternary ammonium amino acid intercalation inhibitor and a water-based drilling fluid containing the inhibitor. Background technique [0002] Borehole wall instability is one of the problems that seriously affect the efficiency of oil and gas drilling and production. The direct or indirect economic losses caused by hole wall instability, diameter shrinkage, diameter expansion, pipe sticking and even well collapse accidents are as high as billions of dollars every year. At present, 75% of the drilled or drilled formations belong to shale formations, and 90% of wellbore instability problems occur in shale formations. This is due to the strong water sensitivity of shale. When the shale formation encounters water, it will produce severe hydration, resulting in hydration expansion and dispersion of shale, resulting in a decreas...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/24
CPCC09K8/035C09K8/24
Inventor 谢刚谷硕黄进军邓明毅罗玉婧范莉陈宇雷震
Owner SOUTHWEST PETROLEUM UNIV
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