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Cellulose nanocrystal used as water-based drilling fluid anti-collapse agent and preparation method of cellulose nanocrystal

A water-based drilling fluid and cellulose technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as refractory degradation, difficult recovery, reservoir damage, etc. The effect of less environmental pollution

Inactive Publication Date: 2018-09-21
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of material is a petroleum-based synthetic material, which is difficult to degrade, and it is difficult to recover after the pores are blocked. If it encounters a reservoir during use, it will cause certain damage to the reservoir.

Method used

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  • Cellulose nanocrystal used as water-based drilling fluid anti-collapse agent and preparation method of cellulose nanocrystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 55g of oxalic acid dihydrate into a three-necked round-bottomed flask with a capacity of 500mL at 20°C, then add 41.7g of distilled water and 0.3g of ferric chloride hexahydrate, stir for 5min, then add 3g of dry bleached poplar For wood pulp, heat up to 100°C with an oil bath, and maintain mechanical stirring at 100°C for 16 hours at a stirring speed of 300r / min. Then, 100 g of distilled water at 90° C. was added to the reaction system, and the reaction solution was directly centrifuged without cooling. The centrifuge speed was set at 6000 r / min, and the running time was 3 min. After centrifugation, transfer the supernatant into a 500mL round-bottomed flask, distill off about 90g of water under reduced pressure, then heat at 100°C for 5min, cool to 20°C, let stand for 0.5h, filter with suction, and filter cake part 2 Water oxalic acid recovery. The precipitate after centrifugation was dispersed with 100mL distilled water, and then centrifuged at a centrifuge speed...

Embodiment 2

[0027] Add 75g of oxalic acid dihydrate into a three-necked round-bottomed flask with a capacity of 500mL at 20°C, then add 21.5g of distilled water and 0.5g of ferric chloride hexahydrate, stir for 5min, then add 3g of dry bleached poplar For wood pulp, heat up to 100°C with an oil bath, and maintain mechanical stirring at 100°C for 10 hours at a stirring speed of 200r / min. Then, 100 g of distilled water at 90° C. was added to the reaction system, and the reaction solution was directly centrifuged without cooling. The centrifuge speed was set at 7000 r / min, and the running time was 3 min. After centrifugation, transfer the supernatant into a 500mL round bottom flask, distill off about 80g of water under reduced pressure, then heat at 100°C for 5min, cool to 20°C, let stand for 0.5h, filter with suction, and filter cake part 2 Water oxalic acid recovery. The precipitate after centrifugation was dispersed with 100mL distilled water, and then centrifuged at a centrifuge speed o...

Embodiment 3

[0029] Add 75g of oxalic acid dihydrate into a three-necked round-bottomed flask with a capacity of 500mL at 20°C, then add 12g of distilled water and 1.0g of ferric chloride hexahydrate, stir for 5min, then add 12g of dry bleached eucalyptus pulp, Raise the temperature to 100°C with an oil bath, and maintain mechanical stirring at 100°C for 7 hours at a stirring speed of 200r / min. Then, 100 g of distilled water at 90° C. was added to the reaction system, and the reaction solution was directly centrifuged without cooling. The centrifuge speed was set at 6000 r / min, and the running time was 3 min. After centrifugation, transfer the supernatant into a 500mL round-bottomed flask, distill off about 75g of water under reduced pressure, then heat at 100°C for 5min, cool to 20°C, let stand for 0.5h, filter with suction, and filter cake part 2 Water oxalic acid recovery. The precipitate after centrifugation is dispersed with 400mL distilled water, and then centrifuged at a centrifuge...

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Abstract

The invention relates to a cellulose nanocrystal used as a water-based drilling fluid anti-collapse agent and a preparation method of the cellulose nanocrystal and belongs to the field of petroleum and natural gas resource exploration and development and natural polymer material preparation. The cellulose nanocrystal used as the water-based drilling fluid anti-collapse agent is prepared from, by weight, 3-12% of cellulose pulp, 54-75% of oxalate dihydrate, 0.25-3.5% of high-priced metal salt and balance water, and made by a reaction at 95-100 DEG C for 7-16 hours under mechanical stirring conditions. The product size is 100-700nm, the cellulose nanocrystal has the advantages of being excellent in anti-collapse capability, free of toxicity and fluorescence, environmentally friendly and thelike and also has good filtrate loss performance, and the temperature resistance is up to 180 DEG C. Since the cellulose nanocrystal is prepared by using natural biomaterials, the cellulose nanocrystal automatically degrades after a period of time to achieve automatic deblocking, and damage to a reservoir is reduced.

Description

technical field [0001] The invention relates to the field of exploration and development of petroleum and natural gas resources and the preparation of natural polymer materials, in particular to a cellulose nanocrystal used as an anti-collapse agent for water-based drilling fluid and a preparation method thereof. Background technique [0002] The problem of well wall collapse has always been an urgent problem to be solved in drilling engineering, which often leads to serious engineering accidents. The formation lithology causing the collapse is mostly hard and brittle mud shale. The mineral composition of hard and brittle mud shale contains: montmorillonite, illite, chlorite and other clay components, which are prone to hydration expansion when exposed to water. Fluid pathways within shale. After the drilling fluid is in contact with the shale formation, water enters the shale along the micropores, causing the inner surface to hydrate and expand to generate expansion press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08B15/02
CPCC08B15/02C09K8/035C09K2208/12
Inventor 解洪祥司传领杨翔皓陈晓倩马国治沈佳晖韩淑君田雨扬
Owner TIANJIN UNIV OF SCI & TECH
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