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Microcrystalline cellulose used as temporary protective plugging agent for drilling fluid reservoir and preparation method thereof

A microcrystalline cellulose and reservoir protection technology, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the difficulty of unsealing asphaltenes or oil-soluble resins, poor pore sealing, logging and environmental protection. impact and other issues, to achieve the effect of low cost, low environmental pollution and low cost

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, these materials all have some weaknesses: calcium carbonate is relatively rigid, and it is not tight for pore plugging, and a lot of drilling fluid will still flow into the reservoir. Asphaltene or oil-soluble resin products have fluorescence and toxicity problems, which will affect the Mud logging and environmental protection have a certain impact, and it is difficult to deblock asphaltene or oil-soluble resin

Method used

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  • Microcrystalline cellulose used as temporary protective plugging agent for drilling fluid reservoir and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 75g of oxalic acid dihydrate into a three-necked round-bottomed flask at 20°C, then add 100g of water and 1g of ferric chloride hexahydrate, stir for 5min, add 5g of dry bleached poplar wood pulp, and use an oil bath Raise the temperature to 100°C, and maintain the mechanical stirring at 100°C for 3h at a stirring speed of 300r / min. Then the reaction solution is directly centrifuged without cooling, the centrifuge speed is set to 3000r / min, and the running time is 3min. After centrifugation, the supernatant is removed into a round bottom flask, and about 50g of water is removed by distillation under reduced pressure, and then heated at 95°C. Heated for 5 minutes under the same conditions, then naturally cooled to 20°C, allowed to stand for 1 hour, filtered with suction, and the filter cake was naturally air-dried to recover oxalic acid dihydrate. After the above centrifugation, the precipitated part was dispersed with 200 mL of distilled water, and then centrifuged ...

Embodiment 2

[0029] Add 35g of oxalic acid dihydrate into a three-necked round-bottomed flask at 20°C, then add 100g of water and 2g of ferric chloride hexahydrate, stir for 5min, add 10g of dry bleached spruce wood pulp, and use oil The temperature of the bath was raised to 95° C. and maintained at 95° C. with mechanical stirring for 5 h at a stirring speed of 300 r / min. Then the reaction solution is directly centrifuged without cooling, the centrifuge speed is set to 4000r / min, and the running time is 3min. After centrifugation, the supernatant is removed into a round bottom flask, and about 50g of water is removed by distillation under reduced pressure, and then the reaction solution is heated at 95°C. Heated for 5 minutes under the same conditions, then naturally cooled to 20°C, allowed to stand for 1 hour, filtered with suction, and the filter cake was naturally air-dried to recover oxalic acid dihydrate. After the above centrifugation, the precipitated part was dispersed with 300 mL ...

Embodiment 3

[0031] Add 55g of oxalic acid dihydrate into a three-necked round-bottomed flask at 20°C, then add 100g of water and 2g of aluminum chloride hexahydrate, stir for 5 minutes, add 10g of dry bleached eucalyptus pulp, and use an oil bath Raise the temperature to 95°C, and maintain mechanical stirring at 95°C for 4 hours at a stirring speed of 300r / min, then directly centrifuge the reaction solution without cooling, set the centrifuge speed to 4000r / min, and run for 3min. After centrifugation Remove the supernatant to a round-bottomed flask, distill off about 60g of water under reduced pressure, then heat at 85°C for 5 minutes, then naturally cool to 10°C, let stand for 1h, filter with suction, and dry the filter cake naturally to recover dihydrate oxalic acid. After the above centrifugation, the precipitated part was dispersed in 300 mL of distilled water, and then centrifuged under the condition that the centrifuge speed was 3000r / min and the running time was 3min, and the super...

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Abstract

The invention relates to microcrystalline cellulose used as a temporary protective plugging agent for a drilling fluid reservoir and a preparation method thereof, and belongs to the field of oil and natural gas resource exploration and development and natural polymer material preparation. The microcrystalline cellulose is prepared by mixing 2 wt%-12 wt% of cellulose slurry, 20 wt%-42 wt% of oxalicacid dihydrate, 0.25 wt%-3.5 wt% of high-valence metal salt and the balance water under the temperature of 95 DEG C-100 DEG C and the condition of conducting mechanical stirring for 3h-5h. The dimension of a product is 20 microns-80 microns, the product has the advantages of no toxin, no fluorescence, environmental friendliness, low cost and the like, effective plugging on micro pores and micro cracks of an oil and gas reservoir can be achieved, because the microcrystalline cellulose is prepared from natural biological materials, the product is self-degraded after a period of time, automaticunsealing can be achieved, and the purpose of protecting the reservoir is achieved.

Description

technical field [0001] The invention relates to the fields of exploration and development of petroleum and natural gas resources and the preparation of natural polymer materials, in particular to a microcrystalline cellulose used as a temporary plugging agent for drilling fluid reservoir protection and a preparation method thereof. Background technique [0002] With the continuous and rapid development of unconventional reservoirs, reservoir protection during drilling has become a technical problem. During the drilling process, there may be a series of downhole complexities such as well collapse, shrinkage, and lost circulation. The drilling fluid technology is related to the success of drilling. The reservoir is mostly a formation with relatively developed pores or fractures. During the drilling process, the drilling fluid is allowed to enter the reservoir. , will inevitably cause damage to the reservoir and seriously affect the recovery efficiency in the later stage. Soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/514C08B15/02
CPCC08B15/02C09K8/035C09K8/514
Inventor 司传领杨翔皓解洪祥陈晓倩沈佳晖田雨扬韩淑君马国治
Owner TIANJIN UNIV OF SCI & TECH
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