Low-density composite proppant, preparation method and applications thereof

A composite support, low-density technology, applied in earth-moving drilling, production fluids, wellbore/well components, etc., can solve the problems of high fracturing fluid performance requirements, high crush resistance strength, high proppant density, etc. The effect of high crushing strength, enhanced mechanical strength and high sphericity

Inactive Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The present invention utilizes a suspension polymerization method to prepare a composite proppant with very low density (equivalent to water), high crushing strength, high sphericity, small deformation under high pressure, simple preparation process and controllable cost, which overcomes the existing There are disadvantages such as high proppant density and high performance requirements for fracturing fluid in the technology

Method used

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  • Low-density composite proppant, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Preparation of water phase and oil phase: Add 2.0g of polyvinyl alcohol, 0.6g of sodium nitrite, 1.0g of sodium carbonate and 200mL of water into a 500mL four-neck flask, keep the temperature at 60°C, and stir for 20min under mechanical stirring at 120rpm. Obtain the aqueous phase; add 70mL styrene, 15mL divinylbenzene, 1.0g dibenzoyl peroxide, 0.4g TAEC, 0.6g carbon black and 0.05g dispersant Disperbyk-161 into a 200mL beaker, ultrasonically disperse for 10min, An oily phase is obtained.

[0059] Suspension polymerization reaction: Add the water phase to the prepared oil phase slowly at a stirring speed of 90 rpm, keep the temperature at 60°C, and stir for 20 minutes; slowly raise the temperature to 75°C within 1 hour, then raise the temperature to 92°C, adjust the stirring speed to 150rpm, Polymerize for 3 hours, then continue to heat up to 108° C., polymerize and crosslink for 3 hours to obtain a polymer product system.

[0060] Post-treatment: naturally cool the po...

Embodiment 2

[0063] Pretreatment of filler: Add 8.0g of hollow glass microspheres (model S60HS) into 80mL of anhydrous ethanol / water (volume ratio 3 / 1) mixed solution, disperse under high-speed stirring at 3500rpm, adjust the stirring after 10min Speed ​​up to 1500rpm, control the system temperature at 60°C, add 2.2mL of silane coupling agent A-171 to the system, adjust the pH value of the system to 4.0 with oxalic acid, and react for 60min; The hollow glass microspheres were placed in a dry box.

[0064] Preparation of water phase and oil phase: Add 1.5g hydroxyethyl cellulose, 0.8g sodium nitrate, 0.8g magnesium carbonate and 200mL secondary water into a 500mL four-neck flask, keep the temperature at 65°C, and mechanically stir at 130rpm Stirring at low temperature for 30min to obtain the water phase; add 80mL styrene, 16mL ethylene glycol dimethacrylate, 0.7g azobisisobutyronitrile, 0.5g TBEC and 7.0g hollow glass microspheres that have been treated with surface modification Put it int...

Embodiment 3

[0069] Preparation of water phase and oil phase: Add 1.8g of polyvinylpyrrolidone, 0.6g of sodium nitrite, 1.2g of calcium carbonate and 200mL of secondary water into a 500mL four-necked bottle, keep the temperature at 55°C, and mechanically stir at 150rpm Stir for 40min to obtain the aqueous phase; mix 65mL methyl methacrylate, 15mL triallyl cyanurate, 1.0g cumene hydroperoxide, 0.4g TAPEH, 0.5g carbon black and 0.05g dispersant Disperbyk-162 Pour into a 200mL beaker, and ultrasonically disperse for 10min to obtain an oil phase.

[0070] Suspension polymerization reaction: Add the water phase to the prepared oil phase slowly at a stirring speed of 100rpm, keep the temperature at 55°C, and continue stirring for 30min; slowly increase the temperature to 80°C within 1h, then raise the temperature to 95°C, and adjust the stirring speed to 180rpm , polymerized for 3.5 hours, then continued to heat up to 105°C, polymerized and crosslinked for 3 hours, and obtained a polymerized pro...

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Abstract

The present invention provides a low-density composite proppant, which is prepared by carrying out a polymerization reaction on an oil phase and an aqueous phase, wherein the oil phase comprises, by weight, 60-90 parts of a monomer, 5-25 parts of a cross-linking agent, 0.01-10 parts of a filler, 0.1-5 parts of an initiator and 0-2 parts of a filler dispersant, and the aqueous phase comprises, by weight, 90-100 parts of water, 0.1-5 parts of a dispersant and 0.1-5 parts of an inorganic salt. The present invention further provides a preparation method of the proppant, wherein the preparation method comprises: uniformly mixing the dispersant, the inorganic salt and the water to obtain the aqueous phase, uniformly mixing the monomer, the cross-linking agent, the initiator, the filler and the optional filler dispersant to obtain the oil phase, mixing the oil phase and the aqueous phase, carrying out a polymerization reaction at a certain temperature to obtain a polymerization product system, and post-treating the obtained polymerization product system. The present invention further discloses applications of the proppant or the proppant prepared according to the method in reservoir fracturing reforming.

Description

technical field [0001] The invention belongs to the field of reservoir reconstruction in the field of oil and gas field development, and in particular relates to a low-density composite proppant. The invention also relates to the preparation method and application of the low-density composite proppant. Background technique [0002] In recent years, fracturing technology has developed rapidly, which has greatly promoted the development and production of tight reservoirs and shale oil and gas. Among them, fracturing design technology and fracturing fluid technology have made significant progress, but as one of the key fracturing technologies, Proppant technology has been slow to make progress. Proppant is the key material for generating high conductivity fractures, but the quartz sand (apparent density about 2.65g / cm3) commonly used in field fracturing construction is currently 3 ), ceramsite (apparent density 2.6-3.8g / cm 3 ), resin-coated sand (apparent density about 2.6g / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F212/36C08F2/20C08F2/44C08F222/14C08F220/14C08F218/08C09K8/80
Inventor 高媛萍龙秋莲苏建政秦龙王益维孟祥龙汪友平张琪凯
Owner CHINA PETROLEUM & CHEM CORP
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