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Shale inhibitor and preparation method thereof

A shale inhibitor and raw material technology, applied in the field of oil drilling, to achieve the effect of inhibiting hydration expansion and reducing ammonia odor

Inactive Publication Date: 2016-06-15
WEIFANG TIANFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention proposes a shale inhibitor and a preparation method thereof, the shale inhibitor can solve the drilling problem at the bottom of mud shale

Method used

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  • Shale inhibitor and preparation method thereof
  • Shale inhibitor and preparation method thereof

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preparation example Construction

[0029] The present invention also discloses a preparation method of shale inhibitor, comprising the following steps:

[0030] 1) adding water and polyetheramine into the reactor to obtain the first mixed solution;

[0031] 2) adding oxalic acid to the first mixed solution obtained in step 1), and controlling the temperature in the reactor to obtain a second mixed solution;

[0032] 3) Add polydimethyldiallylammonium chloride and choline chloride to the second mixed solution obtained in step 2), and stir to react to obtain polyamine shale inhibitor.

[0033] The sources of all raw materials in the present invention are not particularly limited, and they can be commercially available.

[0034] Wherein, water, polyetheramine, oxalic acid, polydimethyldiallyl ammonium chloride and choline chloride are all the same as above, and will not be repeated here.

[0035] In the present invention, the polyamine shale inhibitor obtained by reacting polyetheramine with oxalic acid first, a...

Embodiment 1

[0041] Take 25g of pure water and 15g of polyetheramine into the reaction kettle, stir evenly to obtain the first mixture; add 15g of oxalic acid to the first mixture, and react at 75°C for 3 hours to obtain the second mixed solution; Add 15g of polydimethyldiallylammonium chloride and 30g of choline chloride, keep the temperature in the reactor, and react for 1.5h to obtain polyamine shale inhibitor.

Embodiment 2

[0043] Add 18g of ultrapure water and 10g of polyetheramine into the reaction kettle, stir evenly to obtain the first mixture; add 12g of oxalic acid to the first mixture, and react at 80°C for 4 hours to obtain the second mixed solution; Add 25g of polydimethyldiallylammonium chloride and 35g of choline chloride to the reactor, keep the temperature in the reactor, and react for 2 hours to obtain the polyamine shale inhibitor.

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Abstract

The invention discloses a shale inhibitor, which is prepared by mass percentage of raw materials: 15-35% polydimethyldiallylammonium chloride, 10-25% polyetheramine, 10-25% % oxalic acid, 15-35% choline chloride and 15-40% water. The polyamine shale inhibitor obtained by the reaction of polyetheramine, oxalic acid, polydimethyldiallylammonium chloride and choline chloride can effectively inhibit the hydration expansion of mud shale, and has low toxicity and low Ammonia odor, high thermal stability and good compatibility with other treatment agents are currently the most promising amine shale inhibitors. The experimental results show that the rolling recovery rate is above 87.6%, the volume expansion rate is lower than 11.0%, and the water loss is lower than 29.6mL.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a shale inhibitor and a preparation method thereof. Background technique [0002] Due to the high proportion of clay contained in shale formations, it is easy to hydrate, which has a great negative impact on drilling operations. During the drilling process, there are often problems such as wellbore instability, hole diameter expansion, pipe sticking, torque and resistance increase, etc. A series of downhole complex situations have increased the difficulty of drilling. Therefore, when drilling into shale formations, the inhibition of drilling fluid to shale must be improved to minimize the occurrence of downhole complex situations. Commonly used shale inhibitors mainly include polymers, inorganic salts, asphalt and humic acids, etc. These shale inhibitors have some shortcomings, such as asphalt is not conducive to environmental protection, silicate will make the system flow Den...

Claims

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Application Information

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IPC IPC(8): C09K8/035
CPCC09K8/035C09K2208/12
Inventor 李奎周佳男李川刘志山
Owner WEIFANG TIANFU CHEM TECH
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