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Water suspensible propping agent for oil and gas well fracturing and preparation method thereof

A technology of proppant and coupling agent, which is applied in the field of suspendable proppant in fracturing water and its preparation, can solve the problems affecting the performance of water-swellable polymers, increase the volume of proppant, and have no expansibility, etc., to achieve increased Large volume, improved flow conductivity, complete gel breaking effect

Active Publication Date: 2017-05-17
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the following problems in the above-mentioned prior art: the self-suspending proppant or the hydrogel layer on the surface of the proppant is easily separated from the proppant body during the fracturing stirring process, and the volume of the proppant cannot be increased to achieve For the purpose of suspension, either the selected binder is soluble in water or the selected binder has no swelling in water after curing, which affects the performance of water-swellable polymers, or the selected water-soluble polymer materials such as guar gum , polyvinyl alcohol and polyacrylamide have no gelation and cannot be swelled when dissolved in water

Method used

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  • Water suspensible propping agent for oil and gas well fracturing and preparation method thereof
  • Water suspensible propping agent for oil and gas well fracturing and preparation method thereof
  • Water suspensible propping agent for oil and gas well fracturing and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043] Sulfonate polyester polyol synthesis example 1: 11.1 kilograms of sodium dimethyl sulfonate isophthalate, 18.7 kilograms of isophthalic acid, 15.9 kilograms of diethylene glycol, and 27.0 kilograms of triethylene glycol Add 50 grams of zinc acetate and zinc acetate into the reaction kettle, protect it with nitrogen, heat up to 120°C and start stirring, heat to 140-160°C and keep it for one hour, gradually raise the temperature to 170°C, keep it at 170-175°C, when the acid value is less than 90mgKOH / g and when the reactant is completely clear and transparent, cool down to 140°C, add 22.2 kg of phthalic anhydride and 0.67 kg of trimethylolpropane, heat up to 140-160°C for one hour, then gradually raise the temperature to 190°C, and control the internal temperature during the heating process Not exceeding 103°C, keep warm at 190-200°C, when the acid value is less than 60mgKOH / g, vacuum until the acid value drops below 1mgKOH / g to obtain sulfonate polyester polyol with a hy...

Embodiment 2

[0045]Sulfonate polyester polyol synthesis example 2: 13.4 kilograms of sodium sulfonate isophthalate, 14.8 kilograms of phthalic anhydride, 16.9 kilograms of diethylene glycol, 32.0 kilograms of tetraethylene glycol and dibutyltin oxide Put 28 grams into the reaction kettle, protect it with nitrogen, heat up to 120°C and start stirring, heat to 140-160°C and keep it for one hour, gradually raise the temperature to 170°C, keep it at 170-175°C, and cool down when the acid value is less than 90mgKOH / g To 160°C, add 22.2 kg of phthalic anhydride and 2.6 kg of trimethylolpropane, raise the temperature to 140-160°C for one hour, then gradually raise the temperature to 190°C, and control the internal temperature during the heating process to not exceed 103°C. Insulation, when the acid value is less than 60mgKOH / g, vacuum until the acid value drops below 1mgKOH / g to obtain a sulfonate polyester polyol with a hydroxyl value of 57.6mgKOH / g.

Embodiment 3

[0047] Sulfonate polyester polyol synthesis example 3: 22.2 kilograms of sodium dimethyl sulfonate isophthalate, 11.1 kilograms of phthalic anhydride, 33.75 kilograms of triethylene glycol, 45.0 kilograms of polyethylene glycol and 56 grams of zinc acetate Put it into the reaction kettle, protect it with nitrogen, raise the temperature to 120°C and start stirring, heat to 140-160°C and keep it for one hour, gradually raise the temperature to 170°C, keep it at 170-175°C, and cool down to 160 when the acid value is less than 90mgKOH / g ℃, add 22.2 kg of phthalic anhydride and 5.4 kg of trimethylolpropane, raise the temperature to 140-160 ℃ for one hour, gradually raise the temperature to 190 ℃, control the internal temperature not to exceed 103 ℃ during the heating process, keep the temperature at 190-200 ℃, When the acid value is less than 60mgKOH / g, vacuumize until the acid value drops to 1mgKOH / g to obtain a sulfonate polyester polyol with a hydroxyl value of 52.1mgKOH / g.

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Abstract

The invention relates to a water suspensible propping agent for oil and gas well fracturing and a preparation method thereof. The water suspensible propping agent of the invention comprises a propping agent aggregate, an expansion layer and an interfacial transition layer arranged between the aggregate and the expansion layer, wherein the expansion layer comprises hydrogel dry powder and a binder for bonding the hydrogel dry powder and is swollen in water; and the interfacial transition layer comprises epoxy resin and / or thermoplastic phenolic resin as the interfacial transition layer resin.

Description

technical field [0001] The invention relates to the field of oil and gas well fracturing stimulation, in particular to a suspendable proppant in fracturing water and a preparation method thereof. Background technique [0002] Fracturing is one of the main measures to increase the production of oil and gas wells. It uses high-pressure pumps to inject fracturing fluid into the formation to expand the fractures in the formation, create new fractures and fill them with proppant, thereby increasing the permeability of the formation. Proppants and fracturing fluids are necessary materials for fracturing. [0003] At present, the conventional proppants on the market are mainly ceramsite and quartz sand. The ceramsite proppant has high crush resistance (52MPa fracture rate is generally less than 5%), good sphericity, strong flow conductivity, but relative density Larger, requiring higher fracturing fluid viscosity, more difficult construction, more severe wear and tear on pumps and...

Claims

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Application Information

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IPC IPC(8): C09K8/80
CPCC09K8/80
Inventor 张伟民朱永刚蒙传幼沈雅婷
Owner PETROCHINA CO LTD
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