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Coating agent and preparation method and application and drilling fluid used for petroleum drilling

A technology of coating agent and drilling fluid, which is applied in the field of coating agent and its preparation, can solve problems such as the difficulty in wellbore pressure control, the instability of deep water water-sensitive shale well walls, and the difficulty in meeting the technical requirements of deep water oil and gas drilling engineering. Achieving the effect of avoiding severe viscosity increase at low temperature and facilitating the pressure control of deepwater drilling

Active Publication Date: 2017-04-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Oil-based / synthetic-based drilling fluids have the advantages of excellent inhibition and high temperature stability, and are the first choice for drilling in complex formations, but their cost is high and there are environmental issues
Water-based drilling fluid has the advantages of low cost and environmental protection, but in deepwater drilling, traditional water-based drilling fluid is difficult to solve the problem of wellbore instability in deep water water-sensitive shale; rheology is greatly affected by temperature, which makes it difficult to control wellbore pressure; And there is a risk of hydrate blockage, which makes it difficult to meet the engineering technical needs of deepwater oil and gas drilling
[0005] At present, a lot of research has been carried out on strong inhibitory water-based drilling fluids at home and abroad, and water-based drilling fluids that are suitable for deepwater drilling and have strong inhibitory and stable rheological properties need further research

Method used

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  • Coating agent and preparation method and application and drilling fluid used for petroleum drilling
  • Coating agent and preparation method and application and drilling fluid used for petroleum drilling
  • Coating agent and preparation method and application and drilling fluid used for petroleum drilling

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preparation example Construction

[0033] As long as the coating agent of the present invention meets the aforementioned requirements, the purpose of the present invention can be achieved, and there is no special requirement for its preparation method. For the present invention, the preferred method includes: under polymerization conditions, acrylamide, temperature-resistant monomer and cationic The monomer is polymerized, wherein, preferably, the temperature-resistant monomer is a compound shown in the following formula (IV):

[0034] Formula (Ⅳ): and / or

[0035] The cationic monomer is a compound shown in the following formula (V):

[0036] Formula (Ⅴ):

[0037] According to the invention, preferably R 1 , R 2 Each is independently H, C1-C15 linear or branched chain alkyl.

[0038] According to the invention, preferably R 3 It is H or C1-C5 linear or branched chain alkyl.

[0039] According to the invention, preferably R 1 is methyl, decyl, undecyl or dodecyl.

[0040] According to the invention...

Embodiment approach

[0054] According to a preferred embodiment of the present invention, in parts by weight, the drilling fluid includes: 100 parts of water, 2-3.5 parts of amine inhibitor, 0.1-0.5 part of viscosifier, 0.15-0.5 part of coating agent, and 0.8-5.5 parts of loss agent, 10-30 parts of salt, 0-3 parts of liquid lubricant, 0-3 parts of compounding clay, and 0-20 parts of weighting agent.

[0055] The main improvement of the drilling fluid of the present invention lies in the coating agent, amine inhibitor, and slurry mixing soil. There are no special requirements for other components such as fluid loss reducer, salt, liquid lubricant, weighting agent, viscosifier, etc., which can be based on General selection of fields.

[0056] According to a preferred embodiment of the present invention, wherein the amine inhibitor is polyamine and / or dimethylcyclohexylamine.

[0057] According to a preferred embodiment of the present invention, the polyamine is an amine-based polymer obtained by poly...

Embodiment 1

[0082] Prepare clay-free deep-water water-based drilling fluid, including components in the following weight ratios:

[0083] Polyamine inhibitor: 2; Xanthan gum XC: 0.3; Coating agent: 0.25; Polyanionic cellulose PAC-LV: 0.5; Sulfonated phenolic resin SD-101: 5; NaCl: 10; KCl: 4; for 100.

[0084] The polyamine inhibitor used in this embodiment is prepared by the following method:

[0085] Add 300g of polyoxypropylene diamine and 0.3g of potassium hydroxide into the high-temperature and high-pressure reactor, vacuumize and heat the reactor, and start stirring at the same time, and the stirring rate is 300r / min. When the temperature was raised to 80° C., 25 g of propylene oxide was fed, and the temperature was continued to rise. When the temperature rose to 100° C., 105 g of propylene oxide was fed. After the reaction started, the reaction temperature was maintained at 105°C. After the pressure in the reactor dropped and remained constant, the temperature was maintained for ...

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Abstract

The invention relates to the field of petroleum drilling, and concretely provides a coating agent and a preparation method and an application thereof and drilling fluid, the coating agent contains an acrylamide monomer structural unit shown as a formula (I), an anti-temperature monomer structural unit shown as a formula (II), and a cation monomer structural unit shown as a formula (III), wherein, R1 and R2 are respectively independent as H, C1-C15 straight chain or branched chain alkyl, and R3 is H or C1-C5 straight chain or branched chain alkyl. The drilling fluid has strong inhibition performance and stable rheological property.

Description

technical field [0001] The present invention relates to a coating agent, its preparation method and application, and a drilling fluid for petroleum drilling, and more particularly to a deep-water water-based fluid with strong inhibitory properties and stable rheological properties within a wide range of deep-water wellbore temperature differences. drilling fluid. Background technique [0002] Oceanic deepwater oil and gas resources are abundant and have great potential. Compared with land or shallow sea drilling, marine deepwater drilling faces many special technical problems, requiring deepwater drilling fluids to have the following characteristics: (1) Maintain stable rheological properties within the large temperature difference between "low temperature and high temperature". As the water depth increases, the seawater temperature becomes lower and lower, usually 4°C. The low temperature causes the viscosity and shear force of the drilling fluid to increase significantly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/34C08F220/58C08G65/26C09K8/035C09K8/24C09K8/508
CPCC08F220/56C08G65/2624C09K8/035C09K8/24C09K8/5083C09K8/882C09K2208/12C08F220/34C08F220/585C09K8/18
Inventor 邱正松赵欣钟汉毅黄维安张永君周国伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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