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A kind of preparation method of self-suspending self-degrading proppant

A proppant and self-degrading technology, used in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problems of high viscosity and poor fluidity of the carrier fluid, and achieve good viscosity reduction effect, cost reduction, Reasonable effect of process design

Active Publication Date: 2021-09-21
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the fracturing operation is completed, in order to resume production as soon as possible, the carrier fluid needs to be discharged out of the fracture. However, due to the high viscosity and poor fluidity of the carrier fluid, it is usually necessary to add ammonium persulfate microcapsules to the carrier fluid in advance to delay fracture. glue purpose

Method used

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  • A kind of preparation method of self-suspending self-degrading proppant
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  • A kind of preparation method of self-suspending self-degrading proppant

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Embodiment 1

[0019] A method for preparing a self-suspending self-degrading proppant, the method comprising the following steps:

[0020] Step 1, using solvent water (distilled water or tap water or oil field production sewage) to prepare sucrose solution; the sucrose used as the binder is one of rock sugar, white granulated sugar or soft white sugar, and the concentration of the sucrose solution is 31%;

[0021] Step 2. Soak and wash the proppant (ceramsite or quartz sand) with dilute acid solution, and soak in sucrose solution; the proppant is quartz sand or ceramsite, and the proppant particle size is 45 mesh;

[0022] Step 3, remove the proppant from the sucrose solution, dry or bake to remove excess water on the surface, and keep the surface of the proppant in a wet state;

[0023] Step 4, mix the proppant in step 3 with polymer fine powder particles, nano-dispersant and ammonium persulfate microcapsules, stir evenly, and dry to obtain lumps; the polymer fine powder particles are ordi...

Embodiment 2

[0026] A method for preparing a self-suspending self-degrading proppant, the method comprising the following steps:

[0027] Step 1, using solvent water (distilled water or tap water or oil field production sewage) to prepare a sucrose solution; the sucrose used as a binder is one of rock sugar, white granulated sugar or soft white sugar, and the concentration of the sucrose solution is 12%;

[0028] Step 2. Soak and wash the proppant (ceramsite or quartz sand) with dilute acid solution, and soak in sucrose solution; the proppant is quartz sand or ceramsite, and the proppant particle size is 20 mesh;

[0029] Step 3, remove the proppant from the sucrose solution, dry or bake to remove excess water on the surface, and keep the surface of the proppant in a wet state;

[0030] Step 4, mix the proppant in step 3 with polymer fine powder particles, nano-dispersant and ammonium persulfate microcapsules, stir evenly, and dry to obtain lumps; the polymer fine powder particles are ordi...

Embodiment 3

[0033] A method for preparing a self-suspending self-degrading proppant, the method comprising the following steps:

[0034] Step 1, using solvent water (distilled water or tap water or oilfield production sewage) to prepare sucrose solution; the sucrose used as the binder is one of rock sugar, white granulated sugar or soft white sugar, and the concentration of the sucrose solution is 50%;

[0035] Step 2. Soak and wash the proppant (ceramsite or quartz sand) with dilute acid solution, and soak in sucrose solution; the proppant is quartz sand or ceramsite, and the proppant particle size is 70 mesh;

[0036] Step 3, remove the proppant from the sucrose solution, dry or bake to remove excess water on the surface, and keep the surface of the proppant in a wet state;

[0037] Step 4, mix the proppant in step 3 with polymer fine powder particles, nano-dispersant and ammonium persulfate microcapsules, stir evenly, and dry to obtain lumps; the polymer fine powder particles are ordin...

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Abstract

The invention belongs to the technical field of fracturing in oil and gas reservoirs, and in particular relates to a preparation method of a self-suspension and self-degradation proppant, which uses solvent water to prepare a sucrose solution; soaks and washes the proppant with dilute acid solution, and puts it into the sucrose solution for soaking ; Remove the proppant from the sucrose solution, dry or bake to remove excess water on the surface, and keep the surface of the proppant in a wet state; mix the proppant with polymer fine powder particles, nano-dispersant and ammonium persulfate microcapsules according to a certain ratio Mix, stir evenly, and dry to obtain lumps; the lumps are dispersed by rolling, sieved and bagged to obtain self-suspension and self-degradation proppant, which is ready for use. The proppant produced by this method, on the one hand, has the technical characteristics of the existing self-suspension proppant mine field on-line preparation and injection technology; further simplifies the preparation and injection process steps and related costs, and the gel breaker ammonium sulfate microcapsules and The uniformity of the carrier liquid is higher, the gel breaking speed is faster, and the viscosity reduction effect is better.

Description

Technical field: [0001] The invention belongs to the technical field of oil reservoir and gas reservoir fracturing, and in particular relates to a preparation method of a self-suspension and self-degradation proppant. Background technique: [0002] In recent years, as the development of old oilfields in the eastern part of China has gradually entered the stage of medium-high water cut development, it is difficult to reverse the situation of production decline. Technology is an important technical means to realize the effective development of low-permeability oil and gas reservoirs and unconventional oil and gas reservoirs. The annual production of tight oil in the United States in 2015 reached 2.59×10 8 t, accounting for 45% of the annual oil production; the annual production of unconventional gas is 4500×10 8 m 3 , accounting for 50% of the annual natural gas production. From 2000 to 2012, the proportion of low-permeability and ultra-low-permeability reservoirs in my co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80C09K8/92
Inventor 卢祥国曹伟佳陈清刘义刚张云宝张楠何欣
Owner NORTHEAST GASOLINEEUM UNIV
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