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A high-temperature resistant high-density formate polysulfide drilling fluid and its preparation method

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

Active Publication Date: 2014-10-15
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 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

Method used

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  • A high-temperature resistant high-density formate polysulfide drilling fluid and its preparation method
  • A high-temperature resistant high-density formate polysulfide drilling fluid and its preparation method
  • A high-temperature resistant high-density formate polysulfide drilling fluid and its preparation method

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Embodiment 1

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

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

[0026] In the state of full stirring (high-speed stirring with a rotation speed of 8000-12000 rpm), add 0.6t potassium hydroxide, 0.9t high temperature resistant sulfonate polymer acrylamide and 2- Acrylamide-2-methylpropanesulfonic acid copolymer (molecular weight greater than 5 million), 6t sulfonated treatment agent (3t sulfonated phenolic resin, 1.5t sulfonated lignite resin and 1.2t sulfonated humic acid chromium mixed), 18t High softening point sulfonated asphalt (softening point 180°C), 3t emulsifier SP-80, 2t potassium carbonate, after fully stirring, add 30t formate, and finally ...

Embodiment 2

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

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

[0030] In the state of full stirring (high-speed stirring with a rotation speed of 8000-12000 rpm), add 0.4t potassium hydroxide, 0.6t high temperature resistant sulfonate polymer acrylamide and 2- Acrylamide-2-methyl propane sulfonic acid copolymer (molecular weight greater than 5 million), 4t sulfonated treatment agent (2t sulfonated phenolic resin, 1.2t sulfonated lignite resin and 0.8t sulfonated humic acid chromium mixed), 14t High softening point sulfonated asphalt (softening point 180°C), 2t emulsifier SP-80, 2t potassium carbonate, after fully stirring, add 21t of formate, and fi...

Embodiment 3

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

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

[0034] In the state of full stirring (high-speed stirring with a rotation speed of 8000-12000 rpm), add 0.4t potassium hydroxide, 0.4t high temperature resistant sulfonate polymer acrylamide and 2- Acrylamide-2-methylpropanesulfonic acid copolymer (molecular weight greater than 5 million), 4t sulfonated treatment agent (2t sulfonated phenolic resin, 1.2t sulfonated lignite resin and 0.8t sulfonated humic acid chromium mixed), 6t High softening point sulfonated asphalt (softening point 180°C), 2t emulsifier SP-80, 2t potassium carbonate, after fully stirring, add 21t formate, and finall...

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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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Patent Type & Authority Patents(China)
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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