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Hyperbranched nano-micron plugging material and preparation method

A plugging material and nano-micron technology, applied in the field of oil drilling, can solve problems such as unresolved fundamental problems, instability of emulsifiers, difficulty in having nano-size, etc., to reduce comprehensive drilling costs, prolong stabilization time, and achieve good plugging ability. Effect

Inactive Publication Date: 2018-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to prevent water from entering the formation, researchers in the drilling industry at home and abroad have widely used chemical suppression and physical plugging, and have seen good results, but this problem has not been fundamentally resolved.
[0006] However, the existing nano-sealing materials cannot effectively seal the shale formation due to their own characteristics and difficulty in maintaining the nano-scale size in the system.
Inorganic nanoparticle plugging materials are very easy to agglomerate due to the huge surface energy; inorganic / organic composite nano-plugging materials are difficult to maintain the nanoscale dispersion of inorganic nanoparticles in the organic polymer matrix during the preparation process, so it is difficult to have a suitable Nano-sized; nano-emulsion plugging materials contain a large amount of emulsifiers, on the one hand, it is easy to affect the performance of drilling fluid, on the other hand, it will be unstable due to the emulsifier being absorbed by other substances in the system; nano-dispersion liquid also has similar properties to nano-emulsions. shortcoming

Method used

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  • Hyperbranched nano-micron plugging material and preparation method
  • Hyperbranched nano-micron plugging material and preparation method
  • Hyperbranched nano-micron plugging material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Add 2.0mol N,N-methylenebisacrylamide, 1.0mol 1-(2-aminoethyl)piperazine, and 1.0mol piperazine into a clean and dry three-necked flask, and stir well; N 2 Protect, keep stirring, reflux and condense; heat and stir at 40°C for 48h; precipitate the reaction mixture with 500mL of methanol, filter, wash with methanol, and dry in vacuo to obtain a white solid powder. Particle size distribution: 10-15nm 45.72%; 15-65nm 54.72%.

Embodiment 2

[0041] Add 2.0mol divinylsulfone, 1.0mol N-methylethylenediamine, and 1.5mol piperazine into a clean and dry three-necked flask, and stir evenly; N 2 Protect, keep stirring, and condense under reflux; heat and stir at 45°C for 36h; precipitate the reaction mixture with 500mL of methanol, filter, wash with methanol, and dry in vacuo to obtain a white solid powder. Particle size distribution: 20-40nm 14.05%; 40-315nm 81.14%; 4.5-6μm 4.81%.

Embodiment 3

[0043] Add 2.0mol divinylsulfone, 1.0mol N-ethylethylenediamine, and 1.2mol piperazine into a clean and dry three-necked flask, and stir well; N 2 Protect, keep stirring, reflux and condense; heat and stir at 50°C for 12h; precipitate the reaction mixture with 500mL methanol, filter, wash with methanol, and dry in vacuo to obtain a white solid powder. Particle size distribution: 15~1000nm 94.15%; 3~6μm 5.85%.

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Abstract

The invention discloses a hyperbranched nano-micron plugging material and a preparation method. The plugging material is prepared by polymerizing the following raw material components: a divinyl compound, an amino compound and a piperazine or piperidine compound; the mol ratio of the divinyl compound to the amino compound to the piperazine or piperidine compound is (1 to 3) to (1 to 2) to (1 to 2). The preparation method comprises the following steps: stirring and mixing the components according to the dosage and carrying out polymerization reaction under the protection of nitrogen gas to prepare the nano-micron plugging material. The plugging material disclosed by the invention can be dispersed well in drilling fluid; the nano-micron plugging material with stable granularity is used for reducing the porosity and penetration rate of a micro-crack stratum and the structural integrity of the micro-crack stratum is improved; an actual drilling safety density window is expanded and the stability of a shaft is strengthened.

Description

technical field [0001] The invention relates to the field of oil drilling, and more particularly relates to a hyperbranched nano plugging material and a preparation method. Background technique [0002] Borehole wall instability is a major engineering problem that has plagued the drilling industry for many years and needs to be solved urgently. The instability of the well wall will lead to a series of downhole complex situations and engineering accidents such as leakage, blowout, collapse, sticking, and deviation, which will prolong the drilling cycle and increase the drilling cost, seriously affecting the rapid and high-quality drilling of oil wells and the economics of oil development. benefit. At present, as oil exploration and development advance to deep, complex and unconventional formations, wellbore instability has increasingly become the primary problem restricting oil and gas development in these areas. According to statistics, the complex aging caused by wellbore...

Claims

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Application Information

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IPC IPC(8): C09K8/24C08G83/00
Inventor 李大奇刘四海苏俊霖张凤英陈曾伟褚奇赵素丽刘金华王西江胡子乔
Owner CHINA PETROLEUM & CHEM CORP
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