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Additive composition applicable to viscosity reduction of oil-based drilling fluid and application thereof, and oil-based drilling fluid and application thereof

A composition and additive technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as difficult to control, apparent viscosity and plastic viscosity beyond the reasonable range, so as to save drilling cost, reduce drilling difficulty, The effect of preventing downhole accidents

Active Publication Date: 2017-05-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many types of viscosity reducers for water-based drilling fluids and they are widely used. However, oil-based drilling fluids have long been recognized for their good rheological properties, low viscosity, and easy control. There has been little research on viscosity reducers for oil-based drilling fluids. and products
However, as high-temperature and high-pressure wells have higher and higher requirements on the temperature resistance and density of drilling fluids, even if the oil-based drilling fluid is soil-free oil-based drilling fluid, the oil-based drilling fluid with a density of 2g / cm 3 When above, its apparent viscosity and plastic viscosity will greatly exceed the reasonable range, it is difficult to control, and usually the applicable temperature does not exceed 150 °C

Method used

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  • Additive composition applicable to viscosity reduction of oil-based drilling fluid and application thereof, and oil-based drilling fluid and application thereof
  • Additive composition applicable to viscosity reduction of oil-based drilling fluid and application thereof, and oil-based drilling fluid and application thereof
  • Additive composition applicable to viscosity reduction of oil-based drilling fluid and application thereof, and oil-based drilling fluid and application thereof

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preparation example Construction

[0044] The preparation method of the diblock copolymer of the present invention preferably includes:

[0045] (1) In the presence of a chain transfer agent and a first azo initiator, in a first organic solvent, a compound represented by formula (1') is prepared and polymerized to obtain a polymer with a number average molecular weight of 2000-10000 A; (2) In the presence of a second azo initiator, in a second organic solvent, polymer A and the compound represented by formula (2') are copolymerized;

[0046] Formula 1') Formula (2')

[0047] Where R 1 , R 1' , R 4 , R 4' And R 6 Each independently selected from H and C1-C6 alkyl; R 2 And R 2' Each independently selected from H, C1-C6 alkyl, -O-C(O)-R 3 And -COOR 3 , And R 2 And R 2' At least one is selected from -O-C(O)-R 3 Or -COOR 3 , R 3 Alkyl selected from C1-C6; R 5 X is selected from C1-C8 alkylene; X is selected from -NH- or -O-; X'is selected from halogen. In the present invention, the halogen may be F, Cl, Br, I, etc., for...

preparation example 1

[0124] (1) Molar ratio of the reactant to tetraethylenepentamine: linoleic acid=1:2.2 (that is, the molar ratio of the amount of tetraethylenepentamine based on the primary amine group to the amount of linoleic acid is 1:1.1) Mix and stir at 250r / min for 40min, then adjust the pH of the resulting mixture to 9, and then react at 230°C for 3 hours, while using a water trap to separate water, and then cool to room temperature;

[0125] (2) Mix the reaction product of step (1) with malonic acid (the molar ratio of the amount of tetraethylenepentamine to the amount of malonic acid is 1:0.6), and then adjust the pH of the resulting mixture to 8. Then, it was stirred and reacted at a speed of 400r / min for 6h at 90°C to obtain emulsifier A1. After infrared, hydrogen nuclear magnetic resonance spectrum and carbon spectrum analysis and detection, the emulsifier A1 contains amide groups, unsaturated double bonds and carboxyl groups, and has a comb-shaped structure.

[0126] Preparation examp...

preparation example 2

[0135] (1) Dissolve 16 g (110 mmol) of dimethyl maleate and 1.09 g (3 mmol) of chain transfer agent 2-(dodecyl trithiocarbonate)-2-methylpropionic acid (DMP) In 40mL of benzene, and bubbling with nitrogen for 50min, then add 0.32g (1.2mmol) of the initiator azobisisobutamidine hydrochloride and react at 70℃ for 3.5h, and then distill under reduced pressure to remove the solvent and unreacted monomer to obtain 16.4 g viscous liquid PDM-1. The number average molecular weight is 5400, and the molecular weight distribution index is 1.3.

[0136] (2) Dissolve 29.2g (130mmol) of (3-acrylamidopropyl)trimethylammonium chloride and 16.4g of PDM-1 in 60mL DMF, and add nitrogen gas for 50 minutes, and then add the initiator azobisisobutyl 0.14g (0.5mmol) of amidine hydrochloride was reacted at 110°C for 22h, and cooled to room temperature to terminate the polymerization. The crude product was precipitated in anhydrous methanol, filtered and dried after repeated three times to obtain the d...

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Abstract

The invention specifically relates to an additive composition applicable to viscosity reduction of an oil-based drilling fluid and application thereof, and the oil-based drilling fluid and application thereof. The additive composition is a double block copolymer which is composed of a block A and a block B, wherein the block A is composed of a constitutional unit as shown in a formula (1) which is described in the specification and has a number-average molecular weight of 1500 to 10000, and the block B is composed of a constitutional unit as shown in a formula (2) which is described in the specification. The double block copolymer can be used as a viscosity reducer for the oil-based drilling fluid, especially as a viscosity reducer for a high-density clay-free oil-based drilling fluid; and the double block copolymer can greatly reduce the apparent viscosity and plastic viscosity of the oil-based drilling fluid in high-temperature high-pressure strata while guaranteeing proper shearing force, so drilling speed can be conveniently accelerated and difficulty in well drilling can be reduced.

Description

Technical field [0001] The invention relates to the field of drilling in the petroleum industry, and in particular to an additive composition and application suitable for viscosity reduction of oil-based drilling fluids, and oil-based drilling fluids and applications. Background technique [0002] With the expansion of exploration fields and the development of exploration depth, drilling high temperature and high pressure formations has become the norm in oil and gas drilling operations. High temperature and high pressure means high risk and high cost. At the same time, the requirements for drilling operations, equipment and drilling fluid performance are also higher. [0003] When drilling high temperature and high pressure formations, the high temperature resistance and density of the drilling fluid used have high requirements. In order to ensure the high temperature resistance of the drilling fluid, oil-based drilling fluid with good high temperature resistance is generally sel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/32
CPCC09K8/035C09K8/32C09K2208/34C08F293/005
Inventor 蒋官澄彭双磊贺垠博邓正强李新亮史亚伟王凯王春蕾马光长赵利屈刚
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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