Self-suspended propping agent and preparation method thereof

A proppant and self-suspension technology, which is applied in chemical instruments and methods, earthwork drilling, and production fluids, etc., can solve the problems of increased viscosity of drag-reducing water, unfavorable flowback, and decreased oil output, so as to reduce friction The effects of resistance, environmental protection and energy consumption reduction

Inactive Publication Date: 2015-09-30
BEIJING RECHSAND SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the polymer compound used in the drag reduction water enters the formation along with the clear water, and the viscosity of the drag reduction water increases, w

Method used

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  • Self-suspended propping agent and preparation method thereof
  • Self-suspended propping agent and preparation method thereof
  • Self-suspended propping agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Using quartz sand (river sand) as the raw material, after scrubbing and drying at 120°C for 5 hours, the sand contains no water at all, and the quartz sand of 20-40 meshes is screened as the aggregate;

[0038] 2) Heat 1000g of aggregate to 200°C, add 1410g of epoxy resin, and stir evenly;

[0039] 3) Step 2) The temperature of the mixture was lowered to 140°C, and 8g of carboxymethylcellulose was added. Stir well. After cooling, crush and sieve.

[0040] The proppant obtained after sieving is particles with a particle size of 20-40 mesh, and the surface of the aggregate is coated or partially coated with carboxymethyl cellulose polymer material.

Embodiment 2

[0042] (1) Take 1kg of quartz sand (river sand) of 40-70 mesh as aggregate and set aside;

[0043] (2) Heat to 200°C, add 125g of epoxy resin E-125g to the aggregate, when the temperature drops to 140°C, add 10g of polycaprolactone and mix evenly.

Embodiment 3

[0045] 1) Take 30-50 mesh and 1kg of quartz sand (aeolian sand and sea sand, with the same mesh number and half volume) as aggregate, and set aside;

[0046] 2) First heat the quartz sand to 180°C, add 19110g of o-phthalic unsaturated polyester to the aggregate, when the temperature drops to 130°C, add 5g of carboxymethyl hydroxypropyl guar gum, and mix evenly;

[0047] 3) Cool and sieve the mixture in the above step (2) to obtain.

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Abstract

The invention belongs to the field of fluid mineral product exploration such as petroleum, natural gas and shale gas, and provides a self-suspended propping agent which is prepared by wrapping or partially wrapping a granular framework with a water-soluble high polymer material; the framework consists of solid granules which are sufficient in mechanical strength for bearing crack closing stress and are selected from one or multiple of quartz sand, ceramsite, metal granules, spherical glass granules, sintered monohydrallite, sintered alumina, sintered zirconium oxide, synthetic resin, precoated sand and crushed fruit shell granules; the amount of the water-soluble high polymer material accounts for 0.1-5wt% of that of the framework. The self-suspended propping agent provided by the invention does not need to be fractured by using fracturing fluid which is added with organic macromolecules and is high in cost, and can be fractured by using natural water which can be obtained at any place directly, so that pollution is reduced, and the cost can be lowered. By adopting the self-suspended propping agent provided by the invention, friction resistance of the fracturing fluid can be reduced, and a fracturing support system adopting the self-suspended propping agent has properties which are generally identical to those of conventional fracturing fluid, and is easy to convey and discharge backwards.

Description

technical field [0001] The invention belongs to the field of fluid mineral exploitation such as oil, natural gas and shale gas, and in particular relates to a proppant for strengthening cracks through propping and a preparation method thereof. Background technique [0002] Oilfield crude oil has high viscosity and the fractures of oil reservoirs are narrow. In order to increase oil recovery and reduce costs, fracturing proppant fracturing and propping fracturing are usually used to improve fracture conductivity. Proppants are deposited in formed fractures in the formation, preventing the fractures from closing when the pressure decreases. According to literature, three liquid systems are mainly used in shale gas fracturing in the United States: direct liquid nitrogen injection, nitrogen foam injection, and drag-reducing water. In addition to the cost advantage, drag reducing water can pump a large amount of water and a small amount of proppant under high displacement, and c...

Claims

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Application Information

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IPC IPC(8): C09K8/80
CPCC09K8/805
Inventor 秦升益胡文进王中学胡炜
Owner BEIJING RECHSAND SCI & TECH GRP
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