High-temperature-resistant high-density formate polysulfonate drilling fluid and preparation method thereof

A polysulfonate drilling and formate technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult control of drilling fluid rheology, high solid content, high cycle pressure loss, etc., to overcome density The effects of low adjustment ability, low solid phase content, and improved salt resistance

Active Publication Date: 2012-11-07
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the high-density saturated brine sulfonation system commonly used in drilling fluid technology, due to the use of barite and iron ore powder, has a high solid content, less free water p

Method used

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  • High-temperature-resistant high-density formate polysulfonate drilling fluid and preparation method thereof
  • High-temperature-resistant high-density formate polysulfonate drilling fluid and preparation method thereof
  • High-temperature-resistant high-density formate polysulfonate drilling fluid and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0023] Example 1

[0024] This embodiment provides a density of 2.4g / cm 3 High temperature resistant high density formate polysulfon drilling fluid, which is prepared by the following steps:

[0025] Put 30m in the circulation tank 3 Fresh water, add 0.6t of bentonite, fully stir and pre-hydrate at rest, and the pre-hydration time shall not be less than 24 hours to obtain pre-hydrated bentonite slurry;

[0026] Under the state of full stirring (high-speed stirring at 8000-12000 rpm), add 0.6t potassium hydroxide, 0.9t high-temperature resistant sulfonate polymer acrylamide and 2-into the pre-hydrated bentonite slurry in sequence. Acrylamide-2-methylsulfonic acid copolymer (molecular weight greater than 5 million), 6t sulfonation treatment agent (3t sulfonated phenolic resin, 1.5t sulfonated lignite resin and 1.2t sulfonated chromium humate), 18t high Softening point sulfonated asphalt (softening point 180℃), 3t emulsifier SP-80, 2t potassium carbonate, add 30t formate after fully st...

Example Embodiment

[0027] Example 2

[0028] This embodiment provides a density of 2.25g / cm 3 High temperature resistant high density formate polysulfon drilling fluid, which is prepared by the following steps:

[0029] Put 30m in the circulation tank 3 Fresh water, add 0.9t of bentonite, fully stir and pre-hydrate at rest, and the pre-hydration time shall not be less than 24 hours to obtain pre-hydrated bentonite slurry;

[0030] Under the state of full stirring (high-speed stirring at 8000-12000 rpm), add 0.4t potassium hydroxide, 0.6t high-temperature resistant sulfonate polymer acrylamide and 2- Acrylamide-2-methylsulfonic acid copolymer (molecular weight greater than 5 million), 4t sulfonation treatment agent (2t sulfonated phenolic resin, 1.2t sulfonated lignite resin and 0.8t sulfonated chromium humate), 14t high Softening point sulfonated asphalt (softening point 180℃), 2t emulsifier SP-80, 2t potassium carbonate, 21t formate after fully stirring, and finally high density barite powder 79.3t t...

Example Embodiment

[0031] Example 3

[0032] This embodiment provides a density of 1.80g / cm 3 High temperature resistant high density formate polysulfon drilling fluid, which is prepared by the following steps:

[0033] Put 30m in the circulation tank 3 Fresh water, add 1.2t of bentonite, fully stir and pre-hydrate at rest, and the pre-hydration time shall not be less than 24 hours to obtain pre-hydrated bentonite slurry;

[0034] Under the state of full stirring (high-speed stirring at 8000-12000 rpm), add 0.4t potassium hydroxide, 0.4t high-temperature resistant sulfonate polymer acrylamide and 2-into the pre-hydrated bentonite slurry in sequence. Acrylamido-2-methylsulfonic acid copolymer (molecular weight greater than 5 million), 4t sulfonation treatment agent (2t sulfonated phenolic resin, 1.2t sulfonated lignite resin and 0.8t sulfonated chromium humate), 6t high Softening point sulfonated asphalt (softening point 180℃), 2t emulsifier SP-80, 2t potassium carbonate, after fully stirring, add 21t ...

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Abstract

The invention relates to high-temperature-resistant high-density formate polysulfonate drilling fluid and a preparation method thereof. The high-temperature-resistant high-density formate polysulfonate drilling fluid comprises, by weight, 100 parts of water, 2-5 parts of bentonite, 0.1-10 parts of high-temperature-resistant sulphate polymer, 20-100 parts of formate, 0.6-2.0 parts of potassium hydroxide, 8-20 parts of sulfonating agent, 2-6 parts of blocking agent, 0.5-3.0 parts of emulsifier, 0.2-3.0 parts of pH regulator, and 120-270 parts of barite powder. The invention further provides the preparation method of the high-temperature-resistant high-density formate polysulfonate drilling fluid. The high-temperature-resistant high-density formate polysulfonate drilling fluid is applicable to petroleum drilling of deep wells and extra-deep wells, especially wells in high-thickness salt bed, is capable of resisting the temperature up to 180 DEG C under the density of 1.8-2.5g/cm<3>, tolerating salt to saturation and resisting calcium at 800-1000ppm, and is drilling fluid which is fine in performance and resistant to high temperature, high pressure and hypersalinity.

Description

technical field [0001] The invention relates to a drilling fluid for petroleum exploitation, in particular to a high-temperature-resistant high-density formate polysulfide drilling fluid and a preparation method thereof, belonging to the technical field of petroleum exploration and development. Background technique [0002] Oil drilling technology in the "three high" harsh downhole environments of ultra-deep wells, high temperature, high pressure, and high salinity is recognized as a world-class problem, and drilling fluid technology is one of its core technologies. [0003] At present, the high-density saturated brine sulfonation system commonly used in drilling fluid technology, due to the use of barite and iron ore powder, has a high solid content, less free water phase, high cycle pressure loss, and the temperature resistance can only reach about 160 °C , leading to difficulty in controlling the rheology of drilling fluid at high temperature and frequent treatment. Con...

Claims

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Application Information

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IPC IPC(8): C09K8/24
Inventor 叶艳陈勉安文华尹达邹盛礼卢虎吴晓花
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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