Ultrafine high-density well-drilling/completing working fluid for protecting ultra-deep tight sandstone gas reservoirs and preparation method thereof

A tight sandstone gas reservoir, high-density technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of tight sandstone gas reservoirs such as reduced effective permeability, difficult filtration loss control, and high solid content. Achieve the effect of improving suspension stability and thermal stability, overcoming coalescence tendency, and good performance

Active Publication Date: 2014-12-10
BAZHOU DADE PETROLEUM TECH
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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, oil-based drilling fluid system, and organic salt drilling fluid system commonly used in the drilling and completion working fluid technology for protecting tight sandstone gas reservoirs have high solid content after being weighted with barite and iron ore powder. It is difficult to control the filtration loss under high temperature and high pressure. When drilling the target layer of oil and gas reservoirs, the pollution is serious, which leads to the decrease of effective permeability of tight sandstone gas reservoirs

Method used

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  • Ultrafine high-density well-drilling/completing working fluid for protecting ultra-deep tight sandstone gas reservoirs and preparation method thereof
  • Ultrafine high-density well-drilling/completing working fluid for protecting ultra-deep tight sandstone gas reservoirs and preparation method thereof
  • Ultrafine high-density well-drilling/completing working fluid for protecting ultra-deep tight sandstone gas reservoirs and preparation method thereof

Examples

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example 1

[0022] This embodiment provides a density of 1.85g / cm 3 Ultrafine high-density drilling and completion working fluid, which is prepared by the following steps:

[0023] Put 300 parts by weight of tap water in a beaker, add 455 parts by weight of API barite powder and 12 parts by weight of dispersant, stir the three fully and pour them into a grinder to grind until the particle size distribution of the mixed liquid is about 1-3 Micron, D90 about 4-8 micron.

[0024] Add 21 parts by weight of potassium formate, 6 parts by weight of nitrile silicon fluid loss reducer, and 4 parts by weight of terpolymer fluid loss reducer in the above-mentioned base slurry in order (the effect of mixing the two kinds of fluid loss reducers will be better, there is synergistic effect), 0.3 parts by weight of xanthan gum, 16 parts by weight of sulfonated pitch, 0.8 parts by weight of micro silicon, 12 parts by weight of ultrafine CaCO 3 , at a stirring speed of 12,000 rpm for 30 minutes to obtain...

example 2

[0026] This embodiment provides a density of 2.0g / cm 3 The ultra-fine high-density drilling and completion working fluid, which is prepared by the following steps:

[0027] Put 300 parts by weight of tap water in a beaker, add 600 parts by weight of API barite powder and 17.5 parts by weight of dispersant, stir the three fully and pour them into a grinder to grind until the particle size distribution of the mixed liquid is about 1-3 microns in D50 and about 1-3 microns in D90 About 4-8 microns.

[0028] Add 21 parts by weight of potassium formate, 4.5 parts by weight of nitrile silicon fluid loss reducer, and 4 parts by weight of terpolymer fluid loss reducer in the above-mentioned base slurry in order (the effect of mixing the two kinds of fluid loss reducers will be better, there is synergistic effect), 16 parts by weight of sulfonated pitch, 2.0 parts by weight of micro silicon, 12 parts by weight of ultrafine CaCO 3 , at a stirring speed of 12,000 rpm for 30 minutes to o...

example 3

[0030] This embodiment provides a density of 2.3g / cm 3 The ultra-fine high-density drilling and completion working fluid, which is prepared by the following steps:

[0031] Put 300 parts by weight of tap water in a beaker, add 860 parts by weight of API barite powder and 26 parts by weight of dispersant, stir the three fully and pour them into a grinder to grind until the particle size distribution of the mixed liquid is about 1-3 microns in D50 and about 1-3 microns in D90 About 4-8 microns.

[0032] Add 21 parts by weight of potassium formate, 6 parts by weight of nitrile silicon fluid loss reducer, and 4 parts by weight of terpolymer fluid loss reducer in the above-mentioned base slurry in order (the effect of mixing the two kinds of fluid loss reducers will be better, there is synergistic effect), 12 parts by weight of sulfonated pitch, 1.2 parts by weight of micro silicon, 12 parts by weight of ultrafine CaCO 3 , at a stirring speed of 12,000 rpm for 30 minutes to obtai...

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Abstract

The invention relates to an ultrafine high-density well-drilling / completing working fluid for protecting ultra-deep tight sandstone gas reservoirs and a preparation method thereof. The ultrafine high-density well-drilling / completing working fluid for protecting ultra-deep tight sandstone gas reservoirs comprises the following raw materials in parts by weight: 100 parts of water, 4-12 parts of a dispersant, 5-15 parts of formate, 2-5 parts of a high-temperature-resistant salt-resistant composite sulfonate copolymer, 0.1-0.5 part of a high-temperature-resistant lifted cutting agent, 5-12 parts of a compound plugging agent, and 120-300 parts of a mineral powder weighting agent; and the density of the ultrafine high-density well-drilling / completing working fluid is 1.7-2.3 g / cm<3>. The invention also provides the preparation method of the ultrafine high-density well-drilling / completing working fluid. The ultrafine high-density well-drilling / completing working fluid provided by the invention is suitable for drilling high-pressure gas reservoir layers of deep wells and ultra-deep wells, and under the density condition of 1.8-2.3 g / cm<3>, the temperature resistance can reach 180 DEG C; and in the stage of well completing, the working fluid has a long-term static high-temperature-resistant suspension stabilizing capacity, and satisfies oil-testing well completion operations of deep wells and ultra-deep wells, therefore, the working fluid is a high-temperature-resistant, high-pressure-resistant and hypersalinity-resistant well-drilling / completing working fluid with good performances.

Description

technical field [0001] The invention relates to a drilling and completion working fluid for petroleum exploitation, in particular to an ultra-fine high-density drilling and completion working fluid for protecting ultra-deep tight sandstone gas reservoirs and a preparation method thereof, belonging to the technical field of petroleum exploration and development. Background technique [0002] During drilling, well completion, oil testing and other oil well operations, tight sandstone gas reservoirs are ultra-low permeability reservoirs, and the entry of solid phase and filtrate will easily cause the effective permeability of the reservoir to decrease, damage the reservoir, and protect the tight sandstone The high-density ultra-micro-drilling and completion working fluid for gas reservoirs is one of its core technologies. [0003] At present, the high-density saturated brine sulfonation system, oil-based drilling fluid system, and organic salt drilling fluid system commonly use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12
Inventor 袁尚贤叶彬
Owner BAZHOU DADE PETROLEUM TECH
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