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Ultralow-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 problems such as underground environmental pollution, high toxicity of alkyl diamines, and reduced inhibitory performance, so as to reduce the instability of the well wall, The synthesis process is simple and the effect of improving the temperature resistance performance

Active Publication Date: 2017-01-04
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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  • Ultralow-molecular weight intercalation inhibitor and preparation method thereof
  • Ultralow-molecular weight intercalation inhibitor and preparation method thereof
  • Ultralow-molecular weight intercalation inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (one),

[0037] 1. Add 0.1mol of nitrilotriacetic acid into 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. Add 100ml of dichloromethane, add 10% sodium hydroxide solution dropwise at 0°C until the pH test paper is alkaline, separate the organic layer, dry over anhydrous magnesium sulfate, filter, and distill to obtain ethyl nitrilotriacetate.

[0039] 3. Dissolve 0.05mol of ethyl nitrilotriacetate in 100ml of ammonia water, and vigorously stir for 24 hours in a water bath at 50°C. The solvent was distilled off under reduced pressure to obtain nitrilotriacetic acid triamide, which was dried in vacuo.

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

Embodiment 2

[0054] (one),

[0055] 1. Add 0.1mol of ethylenediaminetetraacetic acid into 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 10% sodium hydroxide solution dropwise at 0°C until the pH test paper is alkaline, separate the organic layer, dry over anhydrous magnesium sulfate, filter, and distill to obtain ethylenediaminetetraacetic acid tetra ethyl ester.

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

[0058] 4. Dissolve 0.05mol of ethylenediaminetetraacetic acid...

Embodiment 3

[0070] (one),

[0071] 1. Add 0.1mol of diethylenetriaminepentaacetic acid into 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 10% sodium hydroxide solution dropwise at 0°C until the pH test paper is alkaline, separate the organic layer, dry over anhydrous magnesium sulfate, filter, and distill to obtain diethylenetriaminepentaacetic acid pentaethyl ester.

[0073] 3. Dissolve 0.05 mol of pentaethyl diethylenetriaminepentaacetate in 50 ml of organic solvent dimethyl sulfoxide, add 5 equivalents of ammonia methanol, add 1% sodium methoxide, and vigorously stir in a water bath at 50°C for 24 hours. The solvent was distilled off under reduced pressure to obtain diethylenetriaminepentaacetic acid pentamide, which was dried in vacuum.

[0074] 4. Dissolve 0.05mol of diethylenetriaminepen...

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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 drilling in oil and gas fields, and in particular relates to an inhibitor for water-based drilling fluid 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 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 horizontal section of shale...

Claims

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Application Information

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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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