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Self-suspension supporting agent for natural water fracturing

A self-suspension, proppant technology, applied in drilling composition, production fluid, wellbore/well components, etc., can solve the problems of increased viscosity of drag reducing water, decreased oil output, large pump power, etc. The effect of reducing friction, protecting groundwater and improving efficiency

Active Publication Date: 2015-09-30
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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  • Self-suspension supporting agent for natural water fracturing
  • Self-suspension supporting agent for natural water fracturing
  • Self-suspension supporting agent for natural water fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 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;

[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 ores such as petroleum, natural gases and shale gases and provides a self-suspension supporting agent for natural water fracturing construction. The self-suspension supporting agent is formed by coating or partially coating water-soluble high polymer materials on aggregate, wherein the aggregate refers to solid particles with enough mechanical strength capable of bearing fracture closure stress and is selected from one or more of quartz sand, ceramsite, metal particles, spherical glass particles, sintered bauxite, sintered alumina, sintered zirconia, synthetic resins, precoated sand and crushed shell particles; and the amount of water-soluble high polymers is 0.1-5wt% of the amount of the aggregate. According to the self-suspension supporting agent provided by the invention, proper high polymer materials and adhesive materials are selected, the supporting agent has good physical properties and chemical stability, the high polymer materials do not enter the reservoir cracks along with a fracturing fluid and can smoothly flow back, and the mining efficiency is obviously improved.

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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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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