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Chitosan and graphene oxide nano-hydrogel plugging agent and water-based drilling fluid

A nano-hydrogel, water-based drilling fluid technology, applied in the field of water-based drilling fluid, to achieve the effect of good performance

Active Publication Date: 2020-10-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And developed a new nano-blocking water-based drilling fluid that can be applied to shale formations to replace oil-based drilling fluid, which can solve the problems of wellbore stability and reservoir pollution.

Method used

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  • Chitosan and graphene oxide nano-hydrogel plugging agent and water-based drilling fluid
  • Chitosan and graphene oxide nano-hydrogel plugging agent and water-based drilling fluid
  • Chitosan and graphene oxide nano-hydrogel plugging agent and water-based drilling fluid

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Effect test

Embodiment 1

[0025] 1. Synthesis of chitosan graphene oxide nano hydrogel plugging agent:

[0026] (1) Preparation of oxidized konjac: Dissolve 8g of konjac in 450mL of distilled water, add 8.5g of sodium periodate, stir evenly at a temperature of 25°C and react in the dark for 12h, add 50mL of ethylene glycol and stir for 4h to terminate the reaction. Dialyze in a dialysis bag with a molecular weight of 3500 for 72 hours, centrifuge, and dry the supernatant at a temperature of 40-50° C. to obtain oxidized konjac.

[0027] (2) Preparation of graphene oxide aqueous solution: add 2g of graphite powder, 2g of potassium persulfate and 2g of phosphorus pentoxide into the reactor, then add 25mL of concentrated sulfuric acid, react at a temperature of 80°C for 8h, and wait for the temperature to drop slowly to After 25°C, the product was filtered, washed, and dried to obtain pre-oxidized graphite powder. Take 1.5g of pre-oxidized graphite powder into the reactor, add 100mL of concentrated sulfur...

Embodiment 2

[0032] 1. Synthesis of chitosan graphene oxide nano hydrogel plugging agent:

[0033] (1) Preparation of oxidized konjac: 6g of konjac was dissolved in 400-500mL distilled water, 6g of sodium periodate was added, stirred evenly at a temperature of 20°C, and then reacted in the dark for 12h, and 60mL of ethylene glycol was added and stirred for 4h to terminate the reaction. Dialyze in a dialysis bag with a molecular weight cut-off of 3500 for 72 hours, centrifuge, and dry the supernatant at a temperature of 40-50° C. to obtain oxidized konjac.

[0034] (2) Preparation of graphene oxide aqueous solution: add 2.4g of graphite powder, 1.6g of potassium persulfate and 1.6g of phosphorus pentoxide into the reactor, then add 30mL of concentrated sulfuric acid, and react at a temperature of 85°C for 8h. After slowly lowering to 20°C, the product was filtered, washed, and dried to obtain pre-oxidized graphite powder. Take 2g of pre-oxidized graphite powder into the reactor, add 100mL ...

Embodiment 3

[0038] 1. Synthesis of chitosan graphene oxide nano hydrogel plugging agent:

[0039] (1) Preparation of oxidized konjac: 7g konjac was dissolved in 440mL distilled water, 8g sodium periodate was added, stirred evenly at a temperature of 24°C and reacted in the dark for 12h, and 80mL ethylene glycol was added to stir for 3h to terminate the reaction. Dialyze in a 3500 dialysis bag for 72 hours, centrifuge, and dry the supernatant at a temperature of 40-50° C. to obtain oxidized konjac.

[0040] (2) Preparation of graphene oxide aqueous solution: 2.6g of graphite powder, 1.8g of potassium persulfate and 1.8g of phosphorus pentoxide were added to the reactor, then 24mL of concentrated sulfuric acid was added, and reacted for 6h at a temperature of 78°C. After the temperature was slowly lowered to 26°C, the product was filtered, washed, and dried to obtain pre-oxidized graphite powder. Take 1.6g of pre-oxidized graphite powder into the reactor, add 100mL of concentrated sulfuric...

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Abstract

The invention discloses a chitosan and graphene oxide nano-hydrogel plugging agent and a water-based drilling fluid. The plugging agent used by the water-based drilling fluid is chitosan and grapheneoxide nano-hydrogel, and the chitosan graphene oxide nano hydrogel comprises synthetic raw materials: chitosan, clay minerals, graphene oxide and konjac oxide; the drilling fluid comprises the chitosan and graphene oxide nano-hydrogel disclosed by the invention. The chitosan and graphene oxide nano-hydrogel is used as a nano-blocking agent, the particle size of the chitosan and graphene oxide nano-hydrogel is approximately distributed between 20 nm and 45 nm, micro-sized and nano-sized pores in a shale well wall can be effectively blocked, and thus the well wall can be effectively stabilized,and collapse is prevented; the used water-based drilling fluid has good rheological property, stability, plugging property and the like under shale formation conditions.

Description

technical field [0001] The invention relates to the technical field of drilling in oil and gas fields, in particular to a chitosan graphene oxide nanometer hydrogel plugging agent, which contains the water-based drilling fluid of the nanometer plugging agent. Background technique [0002] During the drilling of shale gas horizontal wells, wellbore instability has always been a technical problem plaguing oil drilling. Due to the strong water sensitivity of shale and the development of formation fractures, how to use drilling fluid technology to inhibit the hydration expansion of mud shale clay, seal the fine, micro-nano pores and fractures of shale, prevent drilling fluid or filtrate from entering the formation, and reduce the hydration caused by hydration. Or the impact of capillary force on shale formations, preventing shale borehole wall collapse fundamentally solves the wellbore stability problem in shale drilling. Therefore, effectively inhibiting hydration and sealing ...

Claims

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Application Information

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IPC IPC(8): C09K8/42C09K8/03C09K8/16
CPCC09K8/426C09K8/03C09K8/16C09K2208/10
Inventor 谢刚范莉邓明毅罗玉婧肖玉容
Owner SOUTHWEST PETROLEUM UNIV
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