Synthesis of high-temperature-resistant modified nano aluminum oxide blocking agent and oil-based drilling fluid

A nano-alumina and oil-based drilling fluid technology, which is applied in the field of oil and gas field drilling, can solve problems such as well wall instability, and achieve the effects of enhanced salt resistance, good performance, and good high temperature resistance

Active Publication Date: 2022-04-26
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of well wall instability caused by conventional plugging agents unable to effectively plug nano-fractures in mud shale, the present invention provides a high-temperature resistant improved Nano-alumina plugging agent, its particle size is nano-scale, can effectively seal nano-scale fractures in shale formations, so as to achieve the purpose of stabilizing the well wall

Method used

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  • Synthesis of high-temperature-resistant modified nano aluminum oxide blocking agent and oil-based drilling fluid
  • Synthesis of high-temperature-resistant modified nano aluminum oxide blocking agent and oil-based drilling fluid
  • Synthesis of high-temperature-resistant modified nano aluminum oxide blocking agent and oil-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] S1. Dry the nano-alumina in a vacuum drying oven at 60°C for 12 hours, accurately weigh 10 g of the dried nano-alumina in a round-bottomed flask, add 200 mL of ethanol and 200 mL of water into the bottle, ultrasonically disperse for 40 minutes, and then add 0.3 g (3-aminopropyl) dimethylethoxysilane, condensed and refluxed for 5 hours, centrifuged at 10000r / min high-speed centrifuge for 10min to obtain a precipitate, washed with ethanol, repeated 4 times, and vacuum-dried for 20h to obtain Nano-alumina modified by silane coupling agent;

[0027] S2. Dissolve 0.1mol of modified nano-alumina in 150ml of toluene, add 0.01mol of 4-chlorostyrene, stir rapidly at 90°C for 4h, cool to room temperature, add ether, distill under reduced pressure, and dry in vacuum for 3h ; Take 0.1 mol of the dried product, add 0.01 mol of FeCl and 0.5 mol of p-vinylbenzylamine, stir and react at 70°C for 24 hours, and distill under reduced pressure to obtain modified nano-alumina containing eth...

Embodiment 2

[0030] S1. Dry the nano-alumina in a vacuum drying oven at 60°C for 12 hours, accurately weigh 10 g of the dried nano-alumina in a round-bottomed flask, add 200 mL of ethanol and 200 mL of water into the bottle, and ultrasonically disperse for 50 minutes, then add 0.36 gY-Aminopropyldimethylmethoxysilane, condensed and refluxed for 5 hours, centrifuged in a high-speed centrifuge at 10,000r / min for 10 minutes to obtain a precipitate, washed with ethanol, repeated 4 times, and dried in vacuum for 24 hours to obtain a silane coupling Agent-modified nano-alumina;

[0031] S2. Dissolve 0.2mol of modified nano-alumina in 300ml of toluene, add 0.02mol of 2-chlorostyrene, stir rapidly at 100°C for 4h, cool to room temperature, add ether, distill under reduced pressure, and dry in vacuum for 3h ;Take 0.2mol of the dried product, add 0.02mol FeCl and 0.1mol (E)-4-phenyl-3-buten-1-amine, stir and react at 80°C for 20h, and distill under reduced pressure to obtain Modified nano-alumina; ...

Embodiment 3

[0034] S1. Dry the nano-alumina in a vacuum oven at 70°C for 10 hours, accurately weigh 12g of the dried nano-alumina in a round-bottomed flask, add 200mL of ethanol and 200mL of water into the bottle, ultrasonically disperse for 40min, and then add 0.3 gY-Aminopropyltriethoxysilane, after condensation and reflux reaction for 5 hours, centrifuge at 10,000r / min high-speed centrifuge for 10min to obtain precipitate, wash with ethanol, repeat 5 times, and vacuum dry for 20h to obtain modified silane coupling agent Sexual nano-alumina;

[0035] S2. Dissolve 0.15mol of modified nano-alumina in 230ml of toluene, add 0.02mol of 3-chlorostyrene, stir rapidly at 90°C for 4h, cool to room temperature, add ether, distill under reduced pressure, and dry in vacuum for 3h ;Take 0.15mol of the dried product, add 0.02mol FeCl and 0.75mol (E)-4-phenyl-3-butene-1-amine, stir and react at 70°C for 24h, and distill under reduced pressure to obtain Modified nano-alumina;

[0036] S3. Take 0.15 m...

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PUM

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Abstract

The invention discloses synthesis of a high-temperature-resistant modified nano aluminum oxide plugging agent and an oil-based drilling fluid, and belongs to the technical field of oil and gas field drilling. A plugging agent used by the oil-based drilling fluid is a high-temperature-resistant modified nano aluminum oxide plugging agent which is prepared by a step-by-step method. Synthetic raw materials comprise nano aluminum oxide, an amino-containing silane coupling agent, an olefinic bond-containing halogenated aromatic hydrocarbon compound, an olefinic bond-containing primary amine compound, an olefinic bond-containing sulfonate monomer, a cross-linking agent and an initiator. The high-temperature-resistant modified nano aluminum oxide provided by the invention is used as a nano blocking agent, the particle size distribution of the high-temperature-resistant modified nano aluminum oxide is 72-389nm, and the high-temperature-resistant modified nano aluminum oxide can be used for effectively blocking nano-scale cracks of shale. In addition, the plugging agent has the advantage of high temperature resistance, and can be used in deep wells and ultra-deep wells. The plugging agent can be directly added into the oil-based drilling fluid to prevent the drilling fluid from invading the stratum and enhance the well wall stability.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to the synthesis of a high-temperature-resistant modified nano-alumina plugging agent and oil-based drilling fluid. Background technique [0002] During the development of oil and natural gas resources, wellbore instability has always been a worldwide problem that needs to be overcome in the drilling process. During the drilling process, the drilling fluid easily enters the formation along the tiny pores under the action of the pressure difference, and spreads in the micro-fractures, leading to the expansion of the fractures and deteriorating the stability of the wellbore wall. Borehole wall instability will not only waste drilling time and loss of drilling fluid, but also may cause a series of complex situations such as pipe sticking and well collapse, and even lead to the scrapping of the wellbore, resulting in significant economic losses. According to statisti...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/502C09K8/512C09K8/32C08F292/00C08F220/38C08F222/38
CPCC09K8/03C09K8/502C09K8/512C09K8/5083C09K8/32C08F292/00C09K2208/10C08F220/382C08F222/385
Inventor 谢刚汪若兰黄进军罗玉婧范莉陈宇雷震
Owner SOUTHWEST PETROLEUM UNIV
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