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Diblock copolymer suitable for reducing viscosity of oil-based drilling fluid as well as preparation method and application thereof, and oil-based drilling fluid and application thereof

A double-block copolymer and copolymerization technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of unsatisfactory temperature resistance of high-density oil-based drilling fluids, reduce drilling difficulty and save drilling Cost, the effect of increasing the drilling speed

Active Publication Date: 2016-12-14
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a viscosity reducer suitable for high-density oil-based drilling fluids, which is difficult to apply to the viscosity-reducing of high-density oil-based drilling fluids and has unsatisfactory temperature resistance. Diblock copolymer suitable for viscosity reduction of oil-based drilling fluid with good temperature resistance and its preparation method and application, as well as oil-based drilling fluid and application

Method used

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  • Diblock copolymer suitable for reducing viscosity of oil-based drilling fluid as well as preparation method and application thereof, and oil-based drilling fluid and application thereof
  • Diblock copolymer suitable for reducing viscosity of oil-based drilling fluid as well as preparation method and application thereof, and oil-based drilling fluid and application thereof

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preparation example Construction

[0035] The present invention also provides a kind of preparation method of diblock copolymer, this method comprises:

[0036] (1) In the presence of a chain transfer agent and the first azo initiator, in the first organic solvent, the compound represented by the 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 the second azo initiator, in the second organic solvent, polymer A and the compound shown in formula (2') are carried out copolymerization reaction;

[0037] Formula 1') Formula (2')

[0038] Among them, 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 of -O-C(O)-R 3 or-COOR 3 ,R 3 Alkyl selected from C1-C6; R 5 selected from C1-C8 alkylene; X selected from -NH- or -O-; X' selected from halogen. In the present in...

preparation example 1

[0113] (1) The molar ratio of the reactants tetraethylenepentamine: linoleic acid=1:2.2 (that is, the molar ratio of the amount of tetraethylenepentamine in terms of primary amine groups to the amount of linoleic acid is 1:1.1) Mix and stir at 250r / min for 40min, then adjust the pH value of the resulting mixture to 9, then react at 230°C for 3 hours, while using a water separator to separate water, and then cool to room temperature; (2) the step The reaction product of (1) is mixed with malonic acid (the molar ratio of the amount of tetraethylenepentamine to the amount of malonic acid is 1:0.6), and then the pH value of the resulting mixture is adjusted to 8, followed by heating at 90° C. , and stirred at a speed of 400r / min for 6h to obtain emulsifier A1. According to infrared, hydrogen nuclear magnetic resonance and carbon spectrum analysis, the emulsifier A1 contains amide groups, unsaturated double bonds and carboxyl groups, and has a comb structure.

[0114] Cutting agen...

Embodiment 1

[0117] This example is used to illustrate the diblock copolymer of the present invention and its preparation method.

[0118] (1) Dissolve 12g (120mmol) of methyl methacrylate and 1.27g (3.49mmol) of chain transfer agent 2-(dodecyltrithiocarbonate)-2-methylpropionic acid (DMP) in 25mL In benzene, and pass into nitrogen 60min, then add initiator azobisisobutyronitrile 0.27g (1.65mmol) and react 4h at 60 ℃, underpressure distillation removes solvent and unreacted monomer, obtains 11.4g viscous liquid PMMA- 1. Its number average molecular weight was 3800, and its molecular weight distribution index was 1.2.

[0119] (2) Dissolve 23.4g (100mmol) of (3-acrylamidopropyl) trimethylammonium chloride and 11.4g of PMMA-1 in DMF of 70mL, and feed nitrogen gas for 60min, then add initiator azobis 0.08 g (0.49 mmol) of isobutyronitrile was reacted at 100° C. for 24 h, and cooled to room temperature (about 25° C.) to terminate the polymerization. The crude product was precipitated in anh...

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Abstract

The invention relates to the well drilling field of petroleum industry, and concretely relates to a diblock copolymer suitable for reducing viscosity of oil-based drilling fluid as well as a preparation method and an application thereof, and oil-based drilling fluid and an application thereof. The diblock copolymer mainly comprises a block A and a block B, wherein the block A comprises a structural unit which is selected and shown in a formula (1), the block B comprises a structural unit which is selected and shown in the formula (2), and number-average molecular weight of the block A is 1500-10000. The diblock copolymer can be used as a viscosity reducer for oil-based drilling fluid, and especially can be used as a viscosity reducer which is applied to clay free phase oil-based drilling fluid with high density; in a stratum with high temperature and high pressure, a proper shearing force is guaranteed, apparent viscosity and plastic viscosity of the oil-based drilling fluid can be greatly reduced, in order to accelerate drilling speed and reduce well drilling difficulty.

Description

technical field [0001] The invention relates to the field of drilling in the petroleum industry, in particular to a diblock copolymer suitable for reducing the viscosity of oil-based drilling fluids, a preparation method and application thereof, and an oil-based drilling fluid 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, and higher requirements for drilling operations, equipment and drilling fluid performance. [0003] When drilling high-temperature and high-pressure formations, there are high requirements on the high-temperature resistance and density of the drilling fluid used. In order to ensure the high temperature resistance of the drilling fluid, oil-based drilling fluid with good high temperature resistance i...

Claims

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Application Information

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IPC IPC(8): C08F293/00C09K8/035
CPCC08F293/005C09K8/035
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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