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Ultralow molecular weight dendritic alkyl hexamine shale inhibitor and synthetic method thereof

A technology of an alkylhexamine and a synthesis method is applied in the synthesis of dendritic alkylhexamine shale inhibitors and the field of shale inhibitors prepared from alkylhexamines, achieving high yield, stable performance and high price. low cost effect

Inactive Publication Date: 2017-02-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to provide a synthetic method of ultra-low molecular weight dendritic alkyl hexamine shale inhibitor, the drilling fluid additive prepared by the product can fully meet various complex well conditions It can effectively reduce the problem of well wall instability due to shale hydration and dispersion; the synthesis method provided by the invention is reliable, the synthesis yield is high, the raw material price is cheap, the production cost is low, the product is safe and environmentally friendly, and is suitable for large Large-scale industrial production

Method used

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  • Ultralow molecular weight dendritic alkyl hexamine shale inhibitor and synthetic method thereof
  • Ultralow molecular weight dendritic alkyl hexamine shale inhibitor and synthetic method thereof
  • Ultralow molecular weight dendritic alkyl hexamine shale inhibitor and synthetic method thereof

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Effect test

Embodiment 1

[0045] Adopt the following ratio and steps to synthesize alkyltetramines, the steps are as follows:

[0046] Synthesis of S1, triethyl methanetricarboxylate

[0047] S1.1. Add 0.4mol of magnesium oxide, 50ml of dry toluene, 0.25mol of diethyl malonate and 0.20mol of ethyl chloroformate to a dry 250ml three-necked flask, and mix well;

[0048] S1.2. The mixture was refluxed and reacted at 75°C for 7 hours; after the reaction was completed, cool to 5°C, and add pure water at room temperature dropwise until all the precipitates became granular or paste-shaped cakes;

[0049] S1.3. Gently decant the solution, wash the precipitated part with 15ml ether and filter; carefully neutralize the filtered precipitated part with 5mol / L hydrochloric acid under ice bath conditions; after the solid dissolves, use 40ml×2 Extract with water and ether, and combine the organic phases;

[0050] S1.4, the organic phase was washed with 1mol / L hydrochloric acid, water, 5% sodium bicarbonate, and bri...

Embodiment 2

[0064] Synthesis of S1, triethyl methanetricarboxylate

[0065] S1.1. Add 0.6 mol of magnesium oxide, 50 ml of dry toluene, 0.28 mol of diethyl malonate and 0.20 mol of ethyl chloroformate in a dry 250 ml three-necked flask, and mix well;

[0066] S1.2. The mixture was refluxed and reacted at 90°C for 7 hours; after the reaction was completed, cool to 5°C, and add pure water at room temperature dropwise until all the precipitates became granular or paste-shaped cakes;

[0067] S1.3. Gently decant the solution, wash the precipitated part with 15ml ether and filter; carefully neutralize the filtered precipitated part with 5mol / L hydrochloric acid under ice bath conditions; after the solid dissolves, use 40ml×2 Extract with water and ether, and combine the organic phases;

[0068] S1.4, the organic phase was washed with 1mol / L hydrochloric acid, water, 5% sodium bicarbonate, and brine, and finally dried with anhydrous sodium sulfate; diethyl ether was evaporated to obtain a trie...

Embodiment 3

[0086] Synthesis of S1, triethyl methanetricarboxylate

[0087]Add 0.5 mol of magnesium oxide, 50 ml of dry toluene, 0.26 mol of diethyl malonate and 0.20 mol of ethyl chloroformate into a dry 250 ml three-necked flask in sequence, and mix well; the mixture is refluxed at 80°C 7h; after the reaction is completed, cool to 5°C, add pure water at room temperature drop by drop until all the precipitates become granular or paste-shaped cakes; pour off the solution gently, wash the precipitated part with 15ml ether and filter; after filtration The precipitated part was carefully neutralized with 5mol / L hydrochloric acid under ice bath conditions; after the solid was dissolved, it was extracted with anhydrous ether, and the organic phase was combined; the organic phase was respectively treated with 1mol / L hydrochloric acid, water, and 5% hydrogen Sodium, washed with brine, and finally dried with anhydrous sodium sulfate; evaporated ether to obtain the product triethyl methanetricarbo...

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Abstract

The invention relates to an ultralow molecular weight dendritic alkyl hexamine shale inhibitor and a synthetic method thereof. The synthetic method comprises the following steps: 1, synthesizing triethyl methanetricarboxylate; 2, synthesizing hexaester; 3, synthesizing hexaamide; and 4, synthesizing hexamine. The alkyl hexamine product prepared through the method has a molecular structure formula shown in the description, and 1-3% of the alkyl hexamine product is mixed with clear water to prepare a shale inhibitor. The synthetic method has the advantages of good reliability, high synthesis yield, low prices of raw materials, low production cost, safe and environmentally-friendly product, and suitableness for large-scale industrial production; and the alkyl hexamine product is nontoxic and harmless, has good water solubility, and has an obviously better inhibition performance than the same variety of products, and the addition amount of the alkyl hexamine has small influences on the rheological property of a drilling fluid, so the contradiction of the inhibition and the rheological property of the drilling fluid is effectively balanced, and the drilling fluid has high temperature resistance and is especially suitable for drilling ultrahigh temperature deep wells.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field drilling, and in particular relates to a synthesis method of a dendritic alkyl hexamine shale inhibitor suitable for complex shale drilling and its product, as well as a shale formed by using alkyl hexamine Inhibitors. Background technique [0002] At present, in domestic and foreign drilling, there are often problems of well wall instability. Wellbore instability may lead to problems such as wellbore collapse, diameter shrinkage, and pipe sticking, increasing drilling time and drilling costs. 75% of wellbore instability mainly occurs in shale formations, especially water-sensitive formations. [0003] The exploration and development of shale gas resources in my country has been in full swing. According to the accumulation characteristics of shale gas, horizontal wells have become the main drilling method for shale gas development. Compared with conventional horizontal wells, the hori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/13C07C209/50C09K8/035
CPCC07C67/30C07C209/50C07C231/02C09K8/035C09K2208/12C07C211/13C07C233/05C07C69/34
Inventor 谢刚罗平亚邓明毅
Owner SOUTHWEST PETROLEUM UNIV
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