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A self-suspending proppant for natural water fracturing

A technology of self-suspension and proppant, which is applied in the direction of drilling composition, wellbore/well components, production fluid, etc. It can solve the problems of increased viscosity of drag-reducing water, decreased oil output, unfavorable flowback, etc., to achieve Effects of reducing friction, protecting groundwater, and easy flowback

Active Publication Date: 2018-12-04
BEIJING RECHSAND SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, 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, which consumes a lot of pump power during flowback, which is not conducive to all flowback; Polymer compounds block the pores of the formation, resulting in a decrease in oil output and pollution to the formation

Method used

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  • A self-suspending proppant for natural water fracturing
  • A self-suspending proppant for natural water fracturing
  • A self-suspending proppant for natural water fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Using quartz sand (river sand) as raw material, after scrubbing and drying at 120°C for 5 hours, the sand contains no water at all, and 20-40 mesh quartz sand is screened as aggregate;

[0044] 2) Step 1) Heat 1000g of the treated quartz sand to 200°C, add 10g of epoxy resin E-51(618), stir (the temperature of the mixture drops to 170°C during the stirring process), add the curing agent phthalic anhydride 1g, stir well;

[0045] 3) Step 2) The temperature of the mixture was lowered to 140°C, and 8g of carboxymethylcellulose was added. Stir well.

[0046]4) Cooling and sieving, the obtained proppant 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

[0048] 1) Take 1kg of quartz sand (river sand) of 40-70 mesh as aggregate and set aside;

[0049] 2) Heat to 200°C, add 10g of epoxy resin E-55 (616) to the aggregate, when the temperature drops below 140°C, add 10g of polycaprolactone, then add 0.2g of imidazole, and mix evenly.

[0050] 3) After cooling, the obtained proppant is particles with a particle size of 40-70 mesh, and the surface of the aggregate is coated or partially coated with polycaprolactone polymer material.

Embodiment 3

[0052] 1) Take 1kg of quartz sand (river sand) of 30-50 mesh as aggregate and set aside;

[0053] 2) Heat to 220°C, add 330112g of bisphenol A type unsaturated polyester to the aggregate, when the temperature drops to 130°C, add 5g of carboxymethyl hydroxypropyl guar gum, and then add 0.1g of benzoyl peroxide , mixed evenly;

[0054] 3) Cool and sieve the mixture in the above step 2).

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Abstract

The invention belongs to the field of exploitation of fluid minerals such as oil, natural gas and shale gas, and provides a self-suspension proppant for natural water fracturing construction, and the self-suspension proppant is coated or partially coated on aggregate Water-soluble polymer material; the aggregate is a solid particle with sufficient mechanical strength to withstand crack closure stress, selected from quartz sand, ceramsite, metal particles, spherical glass particles, sintered bauxite, sintered alumina, sintered oxide One or more of zirconium, synthetic resin, coated sand, and crushed fruit shell particles; the amount of the water-soluble polymer is 0.1-5wt% of the aggregate amount. The self-suspending proppant proposed by the present invention has good physical properties and chemical stability by selecting suitable polymer materials and bonding materials, and the polymer materials will not enter the reservoir crevices with the fracturing fluid, and can return smoothly row, significantly improving the efficiency of mining.

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] When extracting minerals such as oil, natural gas and shale gas that form in underground rock formations, different types of fluids are introduced into the wellbore or the formation around the wellbore. 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. [0003] The existing propped fracturing technology mainly includes the use of proppant and fracturing fluid (active water, linear glue or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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