A kind of ultra-low molecular weight intercalation inhibitor and preparation method thereof

A molecular weight and inhibitor technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of underground environmental pollution, reduce the inhibition performance, the toxicity of alkyl diamines, etc. The effect of improving temperature resistance and simple synthesis process

Active Publication Date: 2018-11-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

60% to 70% of shale gas horizontal wells in foreign countries use oil-based drilling fluid system, and the vast majority of shale gas horizontal wells completed in China use oil-based drilling fluid system. Strong, good lubricity, and good for protecting the reservoir, but there are disadvantages such as not being environmentally friendly and relatively high cost
Water-based drilling fluids can just overcome the shortcomings of oil-based drilling fluids. However, there are still problems in the wellbore stability of water-based drilling fluids in mudstone or strongly water-sensitive shale formations at this stage, and in-depth research is needed.
[0004] At present, inorganic salts are mainly used as inhibitors in oil fields, but high concentrations of inorganic salts not only seriously affect the rheology of drilling fluids, but also cause serious pollution to the underground environment
Conventional shale inhibitors contain two primary amine groups or polyether amines, and alkyl primary amines are used as inhibitors, which seriously affect the rheology and wall-building properties of drilling fluids, and alkyl diamines are more toxic , does not meet environmental protection requirements
In order to increase its water solubility, polyamine shale inhibitors often add hydroxyl and ether bonds to the carbon chain, but this also reduces its inhibitory performance and has limited temperature resistance

Method used

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  • A kind of ultra-low molecular weight intercalation inhibitor and preparation method thereof
  • A kind of ultra-low molecular weight intercalation inhibitor and preparation method thereof
  • A kind of ultra-low molecular weight intercalation inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (One),

[0037] 1. Add 0.1 mol of nitrilotriacetic acid to a 500ml single-necked flask, add 250ml of absolute ethanol, add 5ml of concentrated sulfuric acid, and react at 75°C for 3h.

[0038] 2. After cooling to room temperature, concentrate under reduced pressure. 100ml of dichloromethane was added, and 10% sodium hydroxide solution was added dropwise at 0°C until the pH test paper was alkaline, the organic layer was separated, dried over anhydrous magnesium sulfate, filtered, and distilled to obtain ethyl triacetin.

[0039] 3. Dissolve 0.05mol ammonia triethyl acetate in 100ml ammonia water, and stir vigorously for 24h in a water bath at 50°C. The solvent was removed by distillation under reduced pressure to obtain nitrilotriacetic acid triamide, which was dried in vacuum.

[0040] 4. Dissolve 0.05 mol nitrilotriacetic acid triamide in dimethyl sulfoxide, add 0.05 mol sodium borohydride, dropwise 0.1 mol boron trifluoride ether, or add 0.1 mol lithium aluminum hydride at 5...

Embodiment 2

[0054] (One),

[0055] 1. Add 0.1 mol of ethylenediaminetetraacetic acid to a 500ml single-necked flask, add 250ml of absolute ethanol, add 5ml of concentrated sulfuric acid, and react at 75°C for 3h.

[0056] 2. After cooling to room temperature, concentrate under reduced pressure. Add 100ml of dichloromethane, add dropwise 10% sodium hydroxide solution at 0℃ until the pH test paper is alkaline, separate the organic layer, dry with anhydrous magnesium sulfate, filter, and distill to obtain ethylenediaminetetraacetic acid Ethyl ester.

[0057] 3. Dissolve 0.05 mol ethylenediaminetetraacetate tetraethyl in 50ml organic solvent dimethyl sulfoxide, add 5 equivalents of ammonia methanol, add 1% sodium methoxide, and stir vigorously for 24h at 50°C in a water bath. The solvent was removed by distillation under reduced pressure to obtain ethylenediaminetetraacetic acid tetraamide, which was dried in vacuum.

[0058] 4. Dissolve 0.05mol ethylenediaminetetraacetic acid tetraamide in dimethy...

Embodiment 3

[0070] (One),

[0071] 1. Add 0.1 mol of diethylenetriaminepentaacetic acid to a 500ml single-necked flask, add 250ml of absolute ethanol, add 5ml of concentrated sulfuric acid, and react at 15°C for 3h.

[0072] 2. After cooling to room temperature, concentrate under reduced pressure. Add 100ml of dichloromethane, add dropwise 10% sodium hydroxide solution at 0℃ until the pH test paper is alkaline, separate the organic layer, dry with anhydrous magnesium sulfate, filter, and distill to obtain diethylenetriaminepentaacetic acid Penta ethyl ester.

[0073] 3. Dissolve 0.05 mol of pentaethyl diethylenetriamine pentaacetate in 50 ml of organic solvent dimethyl sulfoxide, add 5 equivalents of ammonia methanol, add 1% sodium methoxide, and stir vigorously for 24 hours at 50°C in a water bath. The solvent is removed by vacuum distillation to obtain diethylenetriaminepentaacetic acid pentaamide, which is dried in vacuum.

[0074] 4. Dissolve 0.05mol diethylenetriaminepentaacetic acid penta...

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Abstract

The invention relates to an ultralow-molecular weight intercalation inhibitor and a preparation method thereof. The ultralow-molecular weight intercalation inhibitor contains any one or more of amino triethylamine, ethylenediamine tetraethylammonium and diethylenetriamine pentaethylamine and is prepared from the component and clear water in a ratio of 0.5-3%; the amino triethylamine is synthesized from nitrilotriacetic acid; the ethylenediamine tetraethylammonium is synthesized from ethylenediamine tetraacetic acid; and the diethylenetriamine pentaethylamine is synthesized from diethylenetriamine pentaacetic acid; and the preparation method comprises the following steps: adding the raw materials into absolute ethyl alcohol; adding concentrated sulfuric acid for reacting; adding an organic solvent and introducing ammonia water; and stirring and distilling to obtain the product. According to the invention, the inhibition performance of a drilling fluid system can be remarkably improved, the temperature resistance exceeds 240 DEG C, the needs of ultra-deep well drilling are completely met, and the problem of unstable well wall caused by shale hydration and dispersion is effectively reduced; and moreover, the synthesis technology is simple and environment-friendly, the yield is relatively high, the production cost is low, and the ultralow-molecular weight intercalation inhibitor is suitable for industrial production.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas field drilling, and specifically relates to a water-based drilling fluid inhibitor suitable for drilling the horizontal section of a shale gas horizontal well and a preparation method thereof. Background technique [0002] At present, in domestic and foreign drilling, there are often problems of borehole wall instability. Instability of the borehole wall may cause problems such as borehole collapse, diameter reduction, and sticking, which increases 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 fully launched. In view of the characteristics of shale gas accumulation, horizontal wells have become the main drilling method for shale gas development. Compared with conventional horizontal wells, the horizontal section of shale hor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035
CPCC09K8/035C09K2208/12
Inventor 谢刚罗平亚邓明毅
Owner SOUTHWEST PETROLEUM UNIV
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