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Drilling fluid with strong inhibition and strong plugging and preparation method thereof

A technique of drilling fluid and inhibition, which is applied in the field of drilling fluid and its preparation, can solve the problems of good anti-slump performance, and achieve the effects of preventing wellbore collapse, good wellbore collapse, and inhibiting hydration

Active Publication Date: 2018-10-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drilling fluid system has dual inhibitory effects and good anti-slump performance, which can effectively solve practical problems such as shale hydration dispersion expansion and well wall collapse.

Method used

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  • Drilling fluid with strong inhibition and strong plugging and preparation method thereof
  • Drilling fluid with strong inhibition and strong plugging and preparation method thereof
  • Drilling fluid with strong inhibition and strong plugging and preparation method thereof

Examples

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Effect test

Embodiment 1

[0016] Cationic polyamine is the reaction product of butylenediamine, butylene oxide and epoxychlorobutane. The preparation method is to add butylene oxide dropwise to butylenediamine under the condition of stirring and 100℃, react for 1h, and then The temperature was raised to 140°C, and epichlorobutane was added dropwise under stirring, formic acid was added for 1 hour of reaction, and the reaction was continued for 1 hour to obtain a polyamine inhibitor sample. Control the molar ratio of butanediamine, butylene oxide, epoxychlorobutane and formic acid to 1:4:0.4:0.8, and its kinematic viscosity is 456.4mm 2 / s, cationic degree is 0.906mmol / g. The preparation method of the amino compound is to add 103g of diethylenetriamine and 0.5g of potassium hydroxide under stirring, mix well, heat up to 80°C, and gradually add 232g of propylene oxide (the molar ratio of propylene oxide to diethylenetriamine is 4 : 1), after the dropwise addition, react at 80°C for 8h, cool down to room...

Embodiment 2

[0020] Cationic polyamine is the reaction product of butylenediamine, butylene oxide and epoxychlorobutane. The preparation method is to add butylene oxide dropwise to butylenediamine under the condition of stirring and 100℃, react for 1h, and then The temperature was raised to 140°C, and epichlorobutane was added dropwise with stirring, formic acid was added for 1 hour of reaction, and the reaction was continued for 1 hour to obtain a polyamine inhibitor sample. Control the molar ratio of butanediamine, butylene oxide, epoxychlorobutane and formic acid to 1:4:0.4:0.8, and its kinematic viscosity is 456.4mm 2 / s, cationic degree is 0.906mmol / g. The preparation method of the amino compound is to add 146g of triethylenetetramine and 0.73g of potassium hydroxide under stirring, mix well, heat up to 90°C, and gradually add 116g of propylene oxide (the molar ratio of propylene oxide to diethylenetriamine is 3 : 1), after the dropwise addition, react at 90°C for 10h, cool down to r...

Embodiment 3

[0024] Cationic polyamine is the reaction product of butylenediamine, butylene oxide and epoxychlorobutane. The preparation method is to add butylene oxide dropwise to butylenediamine under the condition of stirring and 100℃, react for 1h, and then The temperature was raised to 140°C, and epichlorobutane was added dropwise with stirring, formic acid was added for 1 hour of reaction, and the reaction was continued for 1 hour to obtain a polyamine inhibitor sample. Control the molar ratio of butanediamine, butylene oxide, epoxychlorobutane and formic acid to 1:4:0.4:0.8, and its kinematic viscosity is 456.4mm 2 / s, cationic degree is 0.906mmol / g. The preparation method of the amino compound is to add 146g of triethylenetetramine and 0.94g of potassium hydroxide under stirring, mix well, heat up to 100°C, and gradually add 116g of propylene oxide (the molar ratio of propylene oxide to diethylenetriamine is 2 : 1), after the dropwise addition, react at 100°C for 9h, cool down to ...

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Abstract

The invention discloses a drilling fluid, which comprises, by weight, 3-5% of bentonite, 0.1-0.5% of high viscosity sodium carboxymethyl cellulose, 0.1-0.6% of low viscosity sodium carboxymethyl cellulose, 0.05-0.3% of a fluid loss reducer, 0.3-2.0% of brown coal resin, 0.1-3.0% of KCl; 0.05-0.5% of Na2CO3, 1.0-5.0% of polymeric alcohol, 0.05-0.5% of cationic polyamine with coating effect (called cationic polyamine for short), 0.05-0.3% of an amino compound with filtrate loss reduction and inhibition effects (called amino compound for short), and the balance water. The drilling fluid system has dual inhibition effects, and good anti-collapse performance, can effectively solve clay shale hydrated dispersion expansion, borehole wall collapsing and other practical problems.

Description

technical field [0001] The invention relates to a drilling fluid and a preparation method thereof, in particular to a strong inhibition and strong plugging drilling fluid, a preparation method and application thereof. Background technique [0002] With the deepening of oil and natural gas exploration and development at home and abroad, the development effect of some oil and gas reservoirs is very unsatisfactory, such as mudstone reservoirs, shale gas reservoirs, and coalbed methane reservoirs. During the exploration and development of the above-mentioned oil and gas reservoirs, downhole complex accidents such as borehole wall collapse are very likely to occur. This requires that the drilling fluid system has good plugging performance and suppression ability, so as to ensure the stability of the wellbore when drilling with sandstone interbedded with mudstone or a large section of mudstone. Therefore, it is particularly important to research and develop drilling fluid systems...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24C09K8/467
Inventor 鲁娇杨超尹泽群张喜文黎元生方向晨
Owner CHINA PETROLEUM & CHEM CORP