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Polyionic liquid as surface hydration inhibitor and water-based drilling fluid system

A technology of polyionic liquid and hydration inhibitor, which is applied in the field of water-based drilling fluid, to reduce downhole complex accidents, reduce expansion rate, and prevent wellbore collapse

Active Publication Date: 2020-11-24
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And developed a new type of water-based drilling fluid that can be used in shale formations to replace oil-based drilling fluid, which can solve problems such as wellbore stability and reservoir pollution

Method used

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  • Polyionic liquid as surface hydration inhibitor and water-based drilling fluid system
  • Polyionic liquid as surface hydration inhibitor and water-based drilling fluid system
  • Polyionic liquid as surface hydration inhibitor and water-based drilling fluid system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Synthesis of polyionic liquid inhibitors:

[0019] (1) Synthesis of ionic liquids: Weigh 1.8 g of 4-chloromethylstyrene and 1 g of 2-methylthiazole respectively, and place them in a reactor and stir for 1.5 h to allow them to be fully mixed. Under the condition of heating and stirring, it was condensed and refluxed for 16h. After the reaction was completed, it was naturally cooled to 22°C, and the product was repeatedly washed three times with 12 mL of ethyl acetate to obtain an ionic liquid.

[0020] (2) Synthesis of polyionic liquid: Weigh 2 g of ionic liquid and 0.08 g of azobisisobutyronitrile respectively, and place them in a reactor, feed inert gas nitrogen for 30 min, add 30 mL of methanol to the reactor and stir for 1.5 h, the two substances were fully contacted and mixed in methanol, and then reacted at 60° C. for 24 hours to finally obtain the polyionic liquid inhibitor 1.

[0021] 2. Configuration of water-based drilling fluid:

[0022] Measure 128g of ...

Embodiment 2

[0024] 1. Synthesis of polyionic liquid inhibitors:

[0025] (1) Synthesis of ionic liquid: Weigh 2.0g of 4-chloromethylstyrene and 1.3g of 5-methylthiazole respectively, and put them in the reactor to stir for 1.8h, make them fully mixed, and then let them be heated at 65°C Under the condition of heating and stirring, the condensation was refluxed for 18h. After the reaction was completed, it was naturally cooled to 25° C., and the product was repeatedly washed 5 times with 14 mL of ethyl acetate to obtain an ionic liquid.

[0026] (2) Synthesis of polyionic liquids: Weigh 2.2 g of ionic liquids and 0.1 g of azobisisoheptanonitrile respectively, and place them in a reactor, and add 38 mL of methanol into the reactor after feeding inert gas nitrogen for 40 minutes and stir After 1.8 hours, the two substances were fully contacted and mixed in methanol, and then reacted at 65° C. for 28 hours to finally obtain the polyionic liquid inhibitor 2.

[0027] 2. Configuration of wate...

Embodiment 3

[0030] 1. Synthesis of polyionic liquid inhibitors:

[0031] (1) Synthesis of ionic liquid: Weigh 2.2g of 4-chloromethylstyrene and 1.4g of 2,5-dimethylthiazole respectively, and place them in a reactor and stir for 2h to make them fully mixed, and then make them Under the condition of heating and stirring at 70°C, it was condensed and refluxed for 20h. After the reaction was completed, it was naturally cooled to 30° C., and the product was repeatedly washed 5 times with 15 mL of ethyl acetate to obtain an ionic liquid.

[0032] (2) Synthesis of polyionic liquid: Weigh 2.6g of ionic liquid and 0.12g of azobisisoheptanonitrile respectively, and place them in a reactor, and add 40mL of methanol into the reactor after feeding inert gas nitrogen for 40min and stir For 2 hours, the two substances were fully contacted and mixed in methanol, and then reacted for 30 hours under the condition of heating at 70° C. to finally obtain the polyionic liquid inhibitor 3.

[0033] 2. Configu...

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Abstract

The invention discloses polyionic liquid as a surface hydration inhibitor and a water-based drilling fluid system. The inhibitor used by a water-based drilling fluid is the polyionic liquid, and raw materials for synthesizing the polyionic liquid include a thiazole compound, 4-chloromethylstyrene, an azo compound and methanol; and the drilling fluid comprises the polyionic liquid. The polyionic liquid is used as the surface hydration inhibitor, has good compatibility with the drilling fluid, is excellent in inhibition performance, and can effectively inhibit hydration expansion of shale gas and shale, obviously reduce the shale expansion rate and prevent well wall collapse, drill jamming and the like, so that the stability of a well wall is enhanced, and underground complex conditions arereduced.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to a polyionic liquid used as a surface hydration inhibitor and a water-based drilling fluid containing the inhibitor. Background technique [0002] The exploration and development of clean energy shale gas has become an important strategic task to ensure my country's alternative oil and gas resources. One of the key technologies for shale gas exploration and development is horizontal well drilling. The stability of shale in horizontal well sections and the instability of shale walls in conventional oil and gas wells have always been the most common and difficult problems in drilling engineering worldwide. Drilling fluid technology is one of the key technologies to ensure fast and safe drilling. [0003] At present, the commonly used drilling fluid systems include water-based drilling fluid and oil-based drilling fluid. Oil-based drilling fluids are mainly used...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/508C08F112/14
CPCC09K8/24C09K8/5083C08F112/18C09K2208/02C09K2208/12
Inventor 江林峰谢刚范莉聂梦圆李涛
Owner SOUTHWEST PETROLEUM UNIV
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