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Wettability reversal agent, preparation method of wettability reversal agent, reservoir protection agent composition, drilling fluid for low-permeability and ultra-low permeability reservoir and application of drilling fluid

A reservoir protection agent and wetting reversal technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problem of filtrate intrusion into the reservoir, poor sealing performance, and recovery value of reservoir core permeability Low-level problems, to achieve the effect of reducing fluid loss

Active Publication Date: 2015-05-27
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, although domestic and foreign countries have gone through a long period of exploration in the protection of reservoir drilling fluid technology, they have developed shielding temporary plugging technology, fractal geometry temporary plugging technology, D 90 Ideal temporary plugging technology, broad-spectrum temporary plugging technology, alkali-soluble micron cellulose temporary plugging technology, D 50 Temporary plugging technology, film forming technology, oil film technology, etc., but the protection effect on complex reservoirs such as low permeability and ultra-low permeability is not ideal, and needs to be further improved. water-sensitive damage to reservoir water lock, and under certain conditions, there is still room for further improvement in the plugging effect of these technologies, etc.
[0007] In addition, aiming at the problem of water lock-up damage in low-permeability gas reservoirs, it is proposed to add surfactants into the drilling fluid to reduce the degree of water-lock damage. Completion fluid technology provides ideas, but both the selection of surfactant types and the establishment of protection technology still need to be further improved and improved
However, the performance of the currently used drilling fluid can basically meet the requirements of rock-carrying and wellbore stability, but the reservoir protection effect is not very satisfactory, and the recovery value of the reservoir core permeability is low
Although a temporary plugging agent is added to the drilling fluid, its plugging performance is not very strong because the structural characteristics of the low-permeability reservoir are not fully considered, and it is inevitable that the filtrate will invade the reservoir, which will lead to water sensitivity, water lock, etc. occurrence of damage

Method used

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  • Wettability reversal agent, preparation method of wettability reversal agent, reservoir protection agent composition, drilling fluid for low-permeability and ultra-low permeability reservoir and application of drilling fluid
  • Wettability reversal agent, preparation method of wettability reversal agent, reservoir protection agent composition, drilling fluid for low-permeability and ultra-low permeability reservoir and application of drilling fluid
  • Wettability reversal agent, preparation method of wettability reversal agent, reservoir protection agent composition, drilling fluid for low-permeability and ultra-low permeability reservoir and application of drilling fluid

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preparation example Construction

[0044] The present invention also provides a preparation method of a wetting reversal agent, wherein the method comprises:

[0045] (1) the emulsifying agent mixed solution that emulsifying agent is made in water;

[0046] (2) the emulsifier mixed solution that step (1) makes and formula (1-a), formula (2-a), formula (3-a), formula (4-a), formula (5-a) Contact with the compound shown in the structure of formula (6-a) to prepare a pre-emulsion, and carry out a polymerization reaction of the pre-emulsion in the presence of an initiator;

[0047]

[0048] Among them, R 1 for C 1 -C 6 the alkyl group; R 2 for C 1 -C 6 the alkyl group; R 3 and R 4 each independently for C 0 -C 6 Alkylene; R 5 , R 6 , R 7 , R 8 and R 9 for C 1 -C 6 Alkyl or hydrogen; R 10 for C 0 -C 6 the alkylene group;

[0049] The molar ratio of the compound consumption shown in formula (1-a), formula (2-a), formula (3-a), formula (4-a), formula (5-a) and formula (6-a) structure for 1:0.9...

preparation Embodiment 1

[0126] This example is used to illustrate the wetting reversal agent of the present invention and its preparation method.

[0127] First sodium dodecyl sulfate (SDS, 1.23g), NaHCO 3 (1g) and 170mL distilled water were stirred at high speed (440-460r / min) for 30min to obtain an emulsifier mixture; then butyl acrylate (BA, 16g, 0.125mol), methyl methacrylate (MMA, 12g, 0.12mol ), methacrylic acid (MAA, 2 g, 0.023 mol), 3 g (0.042 mol) of acrylamide (AM, first dissolved in 20 mL of distilled water), styrene (ST, 1 g, 0.0096 mol) and trifluoroethyl acrylate (10.3 g, 0.067mol) The mixture of monomers is added dropwise in the above-mentioned emulsifier mixed solution within 2min, adopts 190rpm to shear to a uniform pre-emulsion with a shear emulsification mixer (JRJ300-1 model of Nantong Clair Company); the pre-emulsion Transfer to the reaction vessel, and pass into nitrogen protection, heat up (heating rate is 0.5°C / min) under rapid stirring (stirring rate is 300rpm), when the tem...

preparation Embodiment 2

[0129] This example is used to illustrate the wetting reversal agent of the present invention and its preparation method.

[0130] First sodium dodecyl sulfate (SDS, 2.1g), NaHCO 3 (2g) and 200mL distilled water were stirred at high speed (440-460r / min) for 40min to obtain an emulsifier mixture; then butyl acrylate (BA, 20g, 0.156mol), methyl methacrylate (MMA, 15g, 0.15mol ), methacrylic acid (MAA, 4 g, 0.047 mol), 5 g (0.058 mol) of acrylamide (AM, first dissolved in 20 mL of distilled water), p-methylstyrene (ST, 2.2 g, 0.019 mol) and trifluoroacrylic acid The mixture of ethyl ester (10.3g, 0.067mol) monomer was added dropwise to the above-mentioned emulsifier mixed solution within 5min, and was sheared to a uniform pre-emulsion with a shear emulsification mixer (JRJ300-1 model of Nantong Claire Company) at 190rpm; The pre-emulsion was transferred into the reaction vessel, and nitrogen protection was introduced, and the temperature was raised under rapid stirring (the stir...

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Abstract

The invention relates to a wettability reversal agent. The wettability reversal agent is prepared from structure units shown in formulas (1), (2), (3), (4), (5) and (6). The invention also provides a preparation method of the wettability reversal agent. The invention also provides a reservoir protection agent composition. The reservoir protection agent composition is prepared from the wettability reversal agent and a reservoir protection agent. The invention also provides a drilling fluid for low-permeability and ultra-low permeability reservoir for the reservoir protection agent composition. The invention also provides an application of the drilling fluid in drilling the low-permeability and ultra-low permeability reservoir. The wettability reversal agent and the reservoir protection agent composition are used for the drilling fluid, so that water and oil phases of the drilling fluid can be effectively prevented from entering the reservoir, the filter loss of the drilling fluid is lowered, and thus the reservoir is effectively protected from being damaged by the drilling fluid.

Description

technical field [0001] The invention relates to a wettability reversal agent, a preparation method thereof, a reservoir protection agent composition, a drilling fluid for low-permeability and ultra-low-permeability reservoirs and its application. Background technique [0002] Drilling fluid is called the blood of drilling. Excellent drilling fluid technology is one of the important guarantees to ensure the safety, quality, efficiency and speed of drilling production operations. Drilling fluid must be used in oilfield development operations. With the advancement of petroleum industry technology, the exploration and development of low-permeability oil and gas resources has ranked first among the five investment priorities for the upstream development of the global oil and gas industry. The world's low-permeability oil and gas resources are very rich and widely distributed. The United States, Russia, Canada and other oil-producing countries have discovered a large number of low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24C08F220/18C08F220/14C08F220/06C08F220/56C08F212/08C08F220/22C08F212/12
CPCC08F212/08C08F220/14C09K8/035C09K8/24C08F220/1804C08F220/06C08F220/56C08F212/12C08F220/22C08F220/585C09K8/03C08F220/24C08F220/08C08F214/18
Inventor 蒋官澄宣扬王玺张朔安玉秀
Owner CHINA UNIV OF PETROLEUM (BEIJING)