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Clean-water-carrying petroleum proppant for petroleum production of low-permeability petroleum reservoir and preparation method thereof

A proppant and oil seepage technology, which is applied in the direction of production fluid, earthwork drilling, coating, etc., can solve the problems of unfavorable oil production increase and reduce the effect of hydraulic fracturing, so as to achieve clean fracturing, not easy to crack and empty, damage reduction effect

Active Publication Date: 2013-09-04
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the bulk density of ceramsite proppant is 1.8 / cm 3 Above, the compressive strength has a crushing rate greater than 10% under 52MPa hydraulic pressure, which cannot fully meet the technical requirements of the proppant to quickly fill the fracturing fracture and firmly support the surface of the fracture, resulting in local fracturing in the deep oil layer of the bottom layer Fractures reclose under the gravity of the upper rock, reducing hydraulic fracturing effectiveness and detrimental to oil stimulation

Method used

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  • Clean-water-carrying petroleum proppant for petroleum production of low-permeability petroleum reservoir and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The clean water-carrying petroleum proppant provided in this example for oil recovery of low-permeability reservoirs is prepared by the following method:

[0025] (1) After mixing 10g of acrylonitrile, 0.1g of methylenebisacrylamide, 0.005g of ammonium persulfate, and 0.5g of liquid paraffin, they were dispersed into 40ml of gelatin solution with a mass percent concentration of 0.1% under stirring conditions, Then raise the temperature to 50°C for 3 hours, then raise the temperature to 80°C for 5 hours, and finally raise the temperature to 95°C for 7 hours to obtain polymer white balls with a particle size of 80-100 mesh.

[0026] (2) Weigh 10g of the above-mentioned dry polymer white ball, add it to the 10g ethanol solution dissolved with 2g phenolic resin and 0.2g hexamethylenetetramine, soak and absorb at room temperature for 0.5h, then pour out the excess solvent , and finally under the condition of stirring, gradually increase the temperature to 200°C at a rate of ...

Embodiment 2

[0028] The clean water-carrying petroleum proppant provided in this example for oil recovery of low-permeability reservoirs is prepared by the following method:

[0029] (1) Disperse 5 g of γ-aminopropyltriethoxysilane and 2.5 g of diatomaceous earth in a methanol solution, stir at room temperature for 0.5 h, then filter and dry with suction to obtain a mineral material modified by a silane coupling agent.

[0030] (2) After mixing 2g of the above-mentioned modified diatomite, 10g of acrylamide, 2g of divinylbenzene, 0.05g of potassium persulfate, and 2g of toluene, they were dispersed into 40ml of 2% by mass concentration under stirring In polyvinyl alcohol solution, then raise the temperature to 75°C for 1 hour, then raise the temperature to 90°C for 5 hours, and finally raise the temperature to 105°C for 3 hours to obtain mineral material composite polymer microspheres with a particle size of 3-10 mesh.

[0031] (3) Weigh 10 g of the above-mentioned dry polymer microspheres...

Embodiment 3

[0033] The clean water-carrying petroleum proppant provided in this example for oil recovery of low-permeability reservoirs is prepared by the following method:

[0034] (1) Mix 7g of styrene, 3g of methyl acrylate, 1g of divinylbenzene, 0.01g of benzoyl peroxide, 0.5g of liquid paraffin, and 0.5g of toluene, and then disperse to a concentration of 40ml by mass under stirring 1% gelatin solution, then heated up to 60°C for 2 hours, then heated up to 85°C for 4 hours, and finally heated up to 95°C for 6 hours to obtain polymer white balls with a particle size of 60-80 mesh.

[0035] (2) Take by weighing 10g dry above-mentioned polymer white ball, join in the 10g chloroform solution that is dissolved in 5g epoxy resin, 1g acetic anhydride that mixes uniformly, soak and absorb 12h at room temperature, then pour out excess solvent, finally in stirring Under the same conditions, the temperature is gradually raised to 200°C at a rate of 20°C / 10min for curing reaction. After curing for...

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Abstract

The invention provides a clean-water-carrying petroleum proppant for petroleum production of a low-permeability petroleum reservoir. The proppant is prepared through coating macromolecular polymer particles with the particle sizes of 3-100 meshes by using macromolecular resin, wherein the macromolecular polymer particles are white polymer balls formed through polymerizing olefin monomers or polymer microspheres formed through compounding after a silane coupling agent modified mineral material is added; and the proppant has the volume density of 0.5-1.0 g / cm<3> and the apparent density of 1.1-1.5 g / cm<3>. The invention simultaneously provides a preparation method of the petroleum proppant. The clean-water-carrying petroleum proppant prepared by adopting the preparation method can greatly reduce the viscosity of sand carrying liquid, reduce the damage to strata and pumps and even realize clean fracturing. Through the low-density proppant, the entire construction cost can be reduced, and the phenomenon of proppant discharging or crack emptying is difficult to occur.

Description

technical field [0001] The invention provides a clear water-carrying petroleum proppant used in low-permeability reservoir oil recovery, and also relates to an ultra-low density organic petroleum proppant and a preparation method thereof. Background technique [0002] The fracturing fluid used in the current fracturing oil recovery process is generally a polymer solution, which has a high density and high cost, which will damage the geological core, reduce the ability of the core to flow backward, and cause pollution to the environment. To solve these problems, more and more attention has been paid to clean water fracturing technology. Clear water fracturing refers to the fracturing operation in which drag reducers, active agents, anti-swelling agents, etc. are added to clean water as working fluids in the reconstruction of low-permeability oil and gas fields. [0003] In recent years, foreign countries have successfully applied clear water fracturing in low-permeability oi...

Claims

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Application Information

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IPC IPC(8): C09K8/80C08J3/24C08F220/42C08F222/38C08F220/54C08F212/36C08F212/08C08F220/14C08F220/56C08F2/44C08J9/00C08J7/04C08K9/06C08K3/34
Inventor 马睿程庆霞暴峰陈涛高洁严春杰王思胡交利汤从海
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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