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Low-density high-temperature plugging agent as well as preparation method and application thereof

A low-density, plugging agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high density of inorganic plugging agents, low recyclability, reduced foam stability, etc. High temperature, good blocking performance, and the effect of improving stability

Pending Publication Date: 2022-01-25
SINOPEC SSC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the existing plugging agents that can be used as low-density drilling fluids have insufficient temperature resistance and low recycling rate; inorganic plugging agents with excellent temperature resistance have high density and reduce foam stability; suitable for 1.0g / cm 3 Water-based or oil-based drilling fluids or completion fluids with the above densities are not suitable for high-temperature-resistant low-density cementing plugging agents with a density of 1.0g / cm 3 The following plugging agents for microfoam drilling fluid or foam drilling fluid

Method used

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  • Low-density high-temperature plugging agent as well as preparation method and application thereof
  • Low-density high-temperature plugging agent as well as preparation method and application thereof
  • Low-density high-temperature plugging agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 40 parts of water glass and 2 times the volume of distilled water into the reaction vessel, add 30% phosphoric acid solution to adjust the pH to 3 while stirring, add ammonia water to adjust the pH to 6.5 after hydrolysis for 1 hour, stir until the gel precipitates, and let it stand for 2 hours; The ethanol and isopropanol solutions were used for surface modification, and after standing for 24 hours, the gel was press-filtered, dried and pulverized at 65°C, soaked in 80% n-hexane solution for 16 hours, desolvated and dried again. Add the obtained low-density silica powder and 7.5 parts of polypropylene resin powder into a high-speed pre-mixer, mix and stir for 25 minutes, and spray 10% silane coupling agent solution on the mixed material under high-speed stirring, and continue Mix for 30 minutes, and dry at 110° C. for 2 hours to obtain the sample of Example 1.

[0035] Test 1: Example 1 Dispersibility Test.

[0036] Measure 50mL of clear water, put it on a magneti...

Embodiment 2

[0068] Add 35 parts of water glass and 2 times the volume of distilled water into the reaction vessel, add 30% phosphoric acid solution to adjust the pH to 2.5 while stirring, add ammonia water to adjust the pH to 6 after hydrolysis for 1 hour, stir until the gel precipitates, and let it stand for 2 hours; The ethanol and isopropanol solutions were used for surface modification, and after standing for 24 hours, the gel was press-filtered, dried and pulverized at 65°C, soaked in 80% n-hexane solution for 16 hours, desolvated and dried again. Add the obtained low-density silica powder and 6.5 parts of polypropylene resin powder into a high-speed pre-mixer, mix and stir for 25 minutes, and spray 10% silane coupling agent solution on the mixed material under high-speed stirring, and continue Mix for 30 minutes and dry at 115°C for 2 hours. Mix the powder obtained by secondary drying with 11 parts of rosin resin to obtain the sample of Example 2.

[0069] Test 1: Example 2 Dispers...

Embodiment 3

[0102] Add 25 parts of water glass and 2 times the volume of distilled water into the reaction vessel, add 30% phosphoric acid solution to adjust the pH to 2 while stirring, add ammonia water to adjust the pH to 5.5 after hydrolysis for 1 hour, stir until the gel is precipitated, and stand for 2 hours; The ethanol and isopropanol solutions were used for surface modification, and after standing for 24 hours, the gel was press-filtered, dried and pulverized at 65°C, soaked in 80% n-hexane solution for 16 hours, desolvated and dried again. Add the obtained low-density silica powder and 4.7 parts of polypropylene resin powder into a high-speed pre-mixer, mix and stir for 25 minutes, and spray 10% silane coupling agent solution on the mixed material under high-speed stirring, and continue Mix for 20 minutes and dry at 120°C for 2 hours. Mix the powder obtained by secondary drying with 3.6 parts of polyethylene powder to obtain the sample of Example 3.

[0103] Test 1: Example 3 Di...

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Abstract

The invention relates to the technical field of leakage-proof and plugging working fluid for drilling engineering, in particular to a low-density and high-temperature plugging agent, and a preparation method and application thereof. The plugging agent comprises the following components in parts by volume: 20-40 parts of liquid glass, 5-18 parts of resin and 2-5 parts of a silane coupling agent. The preparation method comprises the following steps: converting the liquid glass into silicon dioxide gel, modifying the surface of the silicon dioxide gel by using the silane coupling agent, and combining the above with the low-density resin to form the low-density high-temperature plugging agent. A nano-porous network structure exists in particles of the protective agent, and the protective agent is light in weight and low in density which is smaller than or equal to 1.65 g / cm < 3 >; the temperature resistance is higher than or equal to 200 DEG C; inorganic rigid and organic flexible elastic plugging is achieved, and the micro-foam fluid invasion depth reduction rate before and after the plugging agent is added is larger than or equal to 65.7%; the stability of the micro-foam fluid can be improved; and the plugging agent can be applied to high-temperature leakage strata, and the plugging property and stability of low-density fluid are improved.

Description

technical field [0001] The invention relates to the technical field of leakage prevention and plugging working fluid in drilling engineering, in particular to a low-density high-temperature plugging agent, a preparation method and an application thereof. Background technique [0002] Air-filled foam drilling fluid and recyclable micro-foam drilling fluid are low-density (<1.0g / cm3) 3 ) key drilling fluid technology, although its temperature resistance has been continuously improved by industry workers, but the problems of insufficient plugging and pressure bearing performance are rarely discussed. In particular, recyclable micro-foam drilling fluids have higher free water content than foam drilling fluids, resulting in greater permeability loss of filtrates than foam drilling fluids, and more prominent problems in plugging and pressure bearing capacity, which affect the leakage prevention of low-density drilling fluids Plugging effect and application prospect. [0003] ...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/035C09K8/38C09K8/42
CPCC09K8/03C09K8/38C09K8/426C09K2208/10
Inventor 杨倩云王宝田王旭东于雷刘均一明玉广李卉杨华
Owner SINOPEC SSC
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