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Micro-emulsion shale inhibitor and preparing method thereof

A technology of shale inhibitors and microemulsions, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of short action time of inorganic inhibitors, poor inhibition of inhibitors, and influence of system rheology, etc., to achieve Prevent hydration dispersion, good thermal stability, and mild reaction conditions

Active Publication Date: 2018-09-28
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the action time of inorganic inhibitors is short, and amine inhibitors are easy to decompose harmful gas NH 3 , Inhibitors have disadvantages such as poor inhibition, no temperature resistance, and toxicity, and polymer inhibitors have an impact on the rheology of the system

Method used

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  • Micro-emulsion shale inhibitor and preparing method thereof
  • Micro-emulsion shale inhibitor and preparing method thereof
  • Micro-emulsion shale inhibitor and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: a kind of preparation method of microemulsion shale inhibitor, comprises the following steps:

[0031] Step 1 shows the synthesis of the active agent tetradecyltrihydroxyethylammonium bromide: after dissolving triethanolamine in alcohol, the temperature was raised to 65° C. under a nitrogen atmosphere, and bromotetradecane was added dropwise for reflux reaction for 9 hours; After the reaction, the reaction solution was recrystallized using a mixture of ethyl acetate and absolute ethanol, the volume ratio of the absolute ethanol and ethyl acetate was 1:2, the recrystallized product solution was heated, allowed to stand, and suction filtered Afterwards, carry out vacuum drying at a temperature of 65° C. to obtain tetradecyl dihydroxyethyl allyl ammonium bromide;

[0032] Step 2, take 10mL of 5# white oil and 40mL of water phase, add 3.5g of surfactant trihydroxyethyl tetradecyl ammonium bromide and 1.5g of absolute ethanol under high-speed stirring, and then...

Embodiment 2

[0033] Embodiment 2: a kind of preparation method of microemulsion shale inhibitor, comprises the following steps:

[0034] Step 1 shows the synthesis of the active agent tetradecyltrihydroxyethylammonium bromide: after dissolving triethanolamine in alcohol, the temperature is raised to 70°C under nitrogen atmosphere, and tetradecyl bromide is added dropwise for reflux reaction for 10 hours; After the reaction is over, the reaction solution is recrystallized using a mixture of ethyl acetate and absolute ethanol, the volume ratio of the absolute ethanol and ethyl acetate is 1:2.2, the recrystallized product solution is heated, allowed to stand, and suction filtered Afterwards, carry out vacuum drying at a temperature of 65° C. to obtain tetradecyl dihydroxyethyl allyl ammonium bromide;

[0035] Step 2, take 12mL of 5# white oil and 48mL of water phase, add 3.8g of surfactant trihydroxyethyl tetradecyl ammonium bromide and 1.2g of absolute ethanol under high-speed stirring, and ...

Embodiment 3

[0036] Embodiment 3: a kind of preparation method of microemulsion shale inhibitor, comprises the following steps:

[0037] Step 1 shows the synthesis of the active agent tetradecyltrihydroxyethylammonium bromide: after dissolving the triethanolamine in alcohol, the temperature was raised to 75°C under a nitrogen atmosphere, and bromotetradecane was added dropwise for reflux reaction for 11 hours; After the reaction is finished, the reaction solution is recrystallized using a mixture of ethyl acetate and absolute ethanol, the volume ratio of the absolute ethanol and ethyl acetate is 1:2.5, the recrystallized product solution is heated, allowed to stand, and suction filtered Afterwards, carry out vacuum drying at a temperature of 65° C. to obtain tetradecyl dihydroxyethyl allyl ammonium bromide;

[0038] Step 2, take 15mL of 5# white oil and 60mL of water phase, add 5g of surfactant trihydroxyethyl tetradecyl ammonium bromide and 1.6g of methanol under high-speed stirring, and ...

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Abstract

The invention provides a micro-emulsion shale inhibitor and a preparing method thereof. The micro-emulsion shale inhibitor is prepared by compounding a surface active agent tetradecyltriethylammoniumbromide, an oil phase, a water phase and a cosurfactant alcohol, wherein the volume ratio of the oil phase to the water phase is (8-9):(2-1); the mass ratio of the surface active agent tetradecyltriethylammonium bromide to the cosurfactant is (7-8.5):(3-1.5); the ratio of the total mass of the surface active agent tetradecyltriethylammonium bromide and the cosurfactant to the total mass of the oilphase and the water phase is (0.8-1.2):(9.2-8.8). The micro-emulsion shale inhibitor contains the surface active agent quaternary ammonium salt and the oil phase, the micro-emulsion shale inhibitor contends for the active centers of the clay surface through the cooperative adsorption effect of hydroxy and the quaternary ammonium salt and intergranular water of shale, and hydrophobic chains exclude the intergranular water, so that a good inhibition effect is achieved. The oil phase can block tiny formation fractures, certain blocking effect is achieved, and the inhibitor has the advantages ofbeing good in inhibitive ability, resistant to temperature and free of toxicity.

Description

technical field [0001] The invention relates to the technical field of shale inhibitors, in particular to a microemulsion shale inhibitor and a preparation method thereof. Background technique [0002] During the drilling process, 90% of the wellbore instability problems occur in shale formations, and the shale dispersion and spalling caused by the hydration and dispersion of expansive clay in the shale section are the most fundamental causes of wellbore instability. factor. In the past, oil-based drilling fluids were usually used to deal with the problem of well wall instability, but oil-based drilling fluid wastes are not easy to handle and cause serious environmental pollution. With the gradual enhancement of people's awareness of environmental protection, the use of oil-based drilling fluids has been restricted Certain restrictions. Therefore, the development of water-based drilling fluid systems with strong inhibitory properties and key treatment agent inhibitors has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/22
CPCC09K8/035C09K8/22C09K2208/12
Inventor 都伟超张洁陈刚黄剑
Owner XI'AN PETROLEUM UNIVERSITY
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