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Cyclodextrin star polymer, preparation method and application of cyclodextrin star polymer, and fracturing fluid

A star-shaped polymer and cyclodextrin technology, applied in the field of reservoir fracturing, can solve the problems of porosity and permeability reduction, affect the effect of fracturing reconstruction, destroy the structure of salt layer, etc., and achieve the effect of reducing dissolution and thickening Obvious, good shear resistance effect

Active Publication Date: 2019-10-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The clear water fracturing fluid used in the current fracturing measures for inter-salt non-sandstone reservoirs will penetrate the salt layer during construction, causing dissolution and erosion, destroying the structure of the salt layer, resulting in changes in formation stress, resulting in formation slippage and break-off , porosity and permeability decrease, thus affecting the effect of fracturing reconstruction, the present invention provides a new cyclodextrin star polymer, its preparation method and application, and fracturing fluid

Method used

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  • Cyclodextrin star polymer, preparation method and application of cyclodextrin star polymer, and fracturing fluid
  • Cyclodextrin star polymer, preparation method and application of cyclodextrin star polymer, and fracturing fluid
  • Cyclodextrin star polymer, preparation method and application of cyclodextrin star polymer, and fracturing fluid

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preparation example Construction

[0021] The preparation method of cyclodextrin star polymer provided by the invention comprises the following steps:

[0022] (1) performing the first reversible addition-chain scission transfer reaction of monofunctional acrylamide monomers and carboxyl-terminated dithioester compounds to obtain macromolecular chain transfer agents;

[0023] (2) performing a second reversible addition-chain scission transfer reaction on the macromolecular chain transfer agent and a difunctional acrylamide monomer to obtain a star polymer;

[0024] (3) Perform amidation reaction of the star polymer and aminocyclodextrin.

[0025] It is well known to those skilled in the art that the term "reversible addition-chain scission transfer reaction" means that in the free radical polymerization process, when a dithioester compound exists, the reversible reaction between the polymer growth chain and the dithioester compound occurs. Addition, reversible cleavage of adducts and chain transfer reactions, ...

Embodiment approach

[0035] The method of the amidation reaction is not particularly limited in the present invention. According to a preferred embodiment of the present invention, the amidation reaction is carried out by adding a catalyst and a dehydrating agent to the star-shaped polymer under ice-bath conditions and stirring for 15-35 minutes, and then the reaction system is The temperature was raised to 20-50° C. and the stirring reaction was continued for 20-36 hours, then aminocyclodextrin was added and the temperature was maintained at 20-50° C. and the stirring reaction was continued for 50-80 hours. After in-depth research, the inventors of the present invention found that the amidation reaction in this preferred manner can reduce side reactions to a very low level and increase the yield of the final product.

[0036] In the present invention, in order to control the reaction rate and avoid the occurrence of side reactions as much as possible, the first reversible addition-chain scission ...

Embodiment 1

[0046] This example is used to illustrate the cyclodextrin star polymer and its preparation method provided by the present invention.

[0047] (1) Synthesis of macromolecular chain transfer agent PNIPAm-CTA

[0048] NIPAm (N-isopropylacrylamide, 6g, 0.053mol), BCSPA (S-1-butanyl-S'-(α-methyl-α'-acetic acid) trithiocarbonate, 0.158g, 0.00053mol) and AIBN (azobisisobutyronitrile, 10.88mg) were successively dissolved in 18mL of dioxane, and then the resulting reaction mixture solution was filled with nitrogen and deoxygenated under magnetic stirring for 30min, during which ultrasonic waves were used 3 times, each time Last for 1min. Then the reaction mixture solution was placed in an oil bath at 65° C. for polymerization for 17 h. After the reaction was completed, the product was precipitated with ether after the system was cooled to room temperature, and the product was dissolved in a tetrahydrofuran (THF)-ether mixture (volume ratio 1:1) and purified by precipitation once, an...

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Abstract

The invention relates to the field of oil deposit fracturing, and particularly discloses a cyclodextrin star polymer, a preparation method and application of the cyclodextrin star polymer, and a fracturing fluid. The preparation method of the cyclodextrin star polymer includes the following steps: (1) subjecting a monofunctional acrylamide monomer and a carboxyl-terminal disulfide ester compound to a first reversible addition-chain transfer reaction to obtain a macromolecular chain transfer agent; (2) subjecting the macromolecular chain transfer agent and a bifunctional acrylamide monomer to asecond reversible addition-chain transfer reaction to obtain a star polymer; (3) subjecting the star polymer and amino cyclodextrin to an amidation reaction. The novel cyclodextrin polymer prepared by the method has an obvious thickening effect in brine, and can fully develop the suspended sand-carrying ability, so that the solubility of salt layers by the hydraulic fracturing fluid can be greatly reduced, oil layer collapse and casing deformation can be avoided, and effective fracturing transformation of inter-salt shale oil reservoirs is realized; the cyclodextrin star polymer has a great industrial application prospect.

Description

technical field [0001] The invention belongs to the field of reservoir fracturing, and more specifically relates to a cyclodextrin star polymer, a preparation method and application thereof, and a fracturing fluid. Background technique [0002] The Lower Tertiary Qianjiang Formation in the Jianghan Basin is a typical inland fault-depressed salt lake basin, with a maximum deposition thickness of 4200m, more than 160 salt rhythms in the sandstone vertical direction, and a cumulative salt layer thickness of 1800m. The oil and gas reservoirs between the two salt layers are rich in resources , the statistical oil generation is about (26-27) 108t. In Jianghan Oilfield, 46 wells have been tested successively for inter-salt non-sandstone reservoirs, most of which have undergone measures for stimulation, and fracturing accounted for 16 times of 29 layers, which has become one of the important means for the improvement of inter-salt non-sandstone reservoirs. [0003] Different from s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F293/00C08F220/54C08F222/38C09K8/68
CPCC08F220/54C08F222/385C08F293/005C08F2438/03C08G81/02C09K8/68C09K8/882C09K8/90C09K2208/12
Inventor 武俊文张汝生苏建政黄志文岑学齐
Owner CHINA PETROLEUM & CHEM CORP
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